CN1974175A - Injection molding method and injection molding apparatus - Google Patents
Injection molding method and injection molding apparatus Download PDFInfo
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- CN1974175A CN1974175A CNA2006101611224A CN200610161122A CN1974175A CN 1974175 A CN1974175 A CN 1974175A CN A2006101611224 A CNA2006101611224 A CN A2006101611224A CN 200610161122 A CN200610161122 A CN 200610161122A CN 1974175 A CN1974175 A CN 1974175A
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- resin
- lug boss
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 48
- 239000011347 resin Substances 0.000 claims abstract description 430
- 229920005989 resin Polymers 0.000 claims abstract description 430
- 239000000463 material Substances 0.000 claims abstract description 237
- 238000000465 moulding Methods 0.000 claims abstract description 83
- 230000008676 import Effects 0.000 claims description 63
- 238000004519 manufacturing process Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 26
- 238000009434 installation Methods 0.000 claims description 22
- 238000010276 construction Methods 0.000 claims description 11
- 230000002708 enhancing effect Effects 0.000 claims description 4
- 238000003825 pressing Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 283
- 210000002615 epidermis Anatomy 0.000 description 18
- 230000015572 biosynthetic process Effects 0.000 description 13
- 239000007924 injection Substances 0.000 description 11
- 238000002347 injection Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
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- 208000002925 dental caries Diseases 0.000 description 6
- 230000008602 contraction Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 239000011796 hollow space material Substances 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000019628 coolness Nutrition 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
An injection molding apparatus includes a forming mold provided with a gas inlet through which a gas is introduced into an area between a rear molding surface in a cavity and a resin material inside the cavity. A plurality of the gas inlets is provided along a passage direction of the resin material in the cavity. In injection molding the resin molded article, a molten resin material is introduced into the cavity from a resin inlet and, when filling the inside of the cavity with the resin material, the introduction of the gas is sequentially started, beginning with a gas inlet provided in an area inside the cavity which is first filled with the resin material, thereby sequentially pressing the relevant resin material against a front molding surface of the cavity.
Description
Technical field
The present invention relates to a kind of injection moulding method and Coinjection molding apparatus, wherein obtain resin formed article by the injection-molded resin material.
Background technology
For example, at Japan Patent No.3, in the resin formed article manufacture method in 611,058, when the moulded products that has the part heavy wall on to the rear surface side carried out moulding, this patent was designed for the front surface side that prevents moulded products and shrinks.
That is, at Japan Patent No.3, in 611,058, at the die cavity that is used for moulded products is carried out the mould of molding processing, the pressure fluid introducing port is formed on the same side of rear surface side (moulding heavy wall thereon).Also be in the rear surface of die cavity side, use the corresponding part of base portion of heat-insulating material formation and heavy wall.
Like this, pass through heat-insulating material, resin cooling around near the above-mentioned resin of cooling raio of the resin the heavy wall base portion postpones, and pass through from the pressure fluid between introducing port injection moulding goods rear surface side and the heat-insulating material, make near the base portion of heavy wall and this base portion part from die cavity rear surface side pressure pattern chamber front surface side, shrink thereby the front surface side that prevents moulded products produces.
Yet, in existing injection molding technology, especially, when moulding large scale resin formed article or moulding have resin formed article above certain thickness or width, along the passing through under the situation that direction is provided with a plurality of pressure fluid introducing ports (gas introduction port) of resin in the mould, this design can not prevent to shrink etc. on the front surface side of moulded products.
That is, when carrying out large scale or during than the injection moulding of long resin moulded products, (several seconds) make molten resin arrive the end of die cavity from the resin introducing port (resin inlet port) of die cavity to need the regular hour.At this moment, if with method same as the prior art, after molten resin arrives the end of die cavity, gas is imported the die cavity from introducing port, near the resin introducing port, can produce and contacting the epidermis (cured portion) that is formed on the molten resin surface with mould in a large number, make the effect reduction that prevents to shrink etc.
In addition, such situation is arranged, the rear surface of the lug boss of circular cross section plate-like body from resin formed article (as the various assemblies of motor vehicle) is outstanding, be used for resin formed article is installed to another assembly, or the purpose that is used to strengthen.
For example, in JP-A-10-86169 and JP-A-2005-28731, disclosed as the manufacture method that comprises the resin formed article of this lug boss.
JP-A-10-86169 discloses: when the injection-molded resin moulded products, when molten resin cooling that will form resin formed article and curing, compressed air is supplied with the inboard of lug boss, and, molten resin is contacted near the part of lug boss base portion with die pressure by compressed air.Equally, reveal among the JP-A-2005-28731: when manufacturing is provided with the resin formed article of lug boss, tubular pin and sold inside the country being arranged in the cavity section that forms lug boss, and the gap supply compressed air from tubular pin and between being sold inside the country, thereby the molten resin of squeeze pack in die cavity.
Like this, in JP-A-10-86169 and JP-A-2005-28731, prevent with the corresponding plate-like body front surface in rear surface, lug boss place on produce strain regime, for example shrink (being formed on lip-deep indenture).
Yet,, also be not enough to prevent effectively produce strain regime (as shrink) on the resin formed article front surface of lug boss having even use existing resin formed article manufacture method.
Promptly, in the manufacture method of existing resin formed article, have only the inside bottom of lug boss to be compressed air extrusion, thereby may prevent to produce contraction etc., but this manufacture method is not sufficient to prevent effectively produce contraction etc. on corresponding to the front surface of lug boss Outboard Sections at front surface corresponding to the lug boss inside part.Equally, when making compressed air only during the inside bottom of expression lobes portion, in some cases, may have such situation, compressed air enters molten resin inside, and at the inner hollow space that forms of resin formed article.
Summary of the invention
The present invention is intended to address the above problem, the purpose of this invention is to provide a kind of injection moulding method and Coinjection molding apparatus, it can effectively prevent from for example to shrink (being formed on lip-deep indenture) in the whole front surface generation strain regime of resin formed article, comprises the surface that forms the position corresponding to lug boss.
A first aspect of the present invention provides a kind of injection moulding method, use is formed with the mould of die cavity and resin introducing port, resin material filling die cavity is to obtain resin formed article, from the resin introducing port resin material is imported the die cavity, wherein, on the aftershaping surface of die cavity, form a plurality of gas introduction ports, import gas from gas introduction port, the aftershaping surface is used for the rear surface of moulding resin moulded products, and, gas is imported in aftershaping surface and the die cavity in the zone between the resin material, and injection moulding method may further comprise the steps:
From the resin introducing port resin material is imported die cavity; And,
When resin material filling die cavity, by importing gas from gas introduction port, make resin material press the preceding molded surface of die cavity, preceding molded surface is used for the front surface of moulding resin moulded products, wherein, the gas introduction port near the resin introducing port begins the gas importing earlier than the described resin introducing port of distance gas introduction port far away.
In the present invention's injection moulding method in this respect, use the die cavity that is provided with a plurality of gas introduction ports.Like this, by the timing of design, can prevent from the front surface of resin formed article, to produce strain regime effectively and for example shrink from each gas introduction port gas jet.
When the injection-molded resin moulded products, resin material imports the die cavity from the resin introducing port.
Like this, when by resin material filling die cavity inside, in die cavity,, begin earlier gas is imported to the zone between the resin material in die cavity aftershaping surface and the die cavity near the gas introduction port (being arranged on the gas introduction port in the zone that is full of resin material in the die cavity earlier) in the part of resin introducing port.By this configuration, the zone that is full of resin material in the die cavity earlier makes resin material press the preceding molded surface of die cavity earlier.
Reason thus, in the present invention in this respect, epidermis (cured portion of resin material) is formed on earlier in the zone that is full of resin material in the die cavity earlier, and epidermis is formed on the molten resin surface that contacts with the molded surface of die cavity.Simultaneously, can at first pressurize to being full of the resin material that forms cuticle region earlier.
Therefore, in this respect the injection moulding method according to the present invention can prevent effectively that the whole front surface of resin formed article from producing strain regime, for example shrinks (being formed on lip-deep indenture).
A second aspect of the present invention provides a kind of injection moulding method, use is provided with the mould of die cavity and resin introducing port, resin material filling die cavity is to obtain resin formed article, by the resin introducing port resin material is imported die cavity, wherein, on the aftershaping surface of die cavity, form one or more gas introduction ports, import gas by gas introduction port, the aftershaping surface is used for the rear surface of moulding resin moulded products, and, gas is imported the zone between the resin material in aftershaping surface and the die cavity, injection moulding method may further comprise the steps:
From the resin introducing port resin material is imported die cavity; And
When in die cavity, flowing at resin material, begin to import gas from least one gas introduction port, make resin material press the preceding molded surface of die cavity, preceding molded surface is used for the front surface of moulding resin moulded products.
In the injection moulding method of the present invention aspect this, when resin material flows in die cavity, begin to import gas from least one gas introduction port.
Reason in the present invention in this respect, forms a large amount of epidermises (cured portion of resin material) before on the molten resin surface on contact cavity forming surface thus, can make resin material press the preceding molded surface of die cavity.
Therefore, in this respect the injection moulding method according to the present invention also can prevent to produce strain regime effectively on whole front surfaces of resin formed article, for example shrinks (indenture of formation on the surface).
A kind of Coinjection molding apparatus is provided according to a third aspect of the invention we, has comprised:
Mould is provided with die cavity and resin introducing port, and resin material filling die cavity imports die cavity by the resin introducing port with resin material to obtain resin formed article,
Wherein, form gas introduction port on the aftershaping surface of die cavity, import gas by gas introduction port, the aftershaping surface is used for the rear surface of moulding resin moulded products, and, gas is imported the zone between the resin material in aftershaping surface and the die cavity,
The direction of passing through along the resin material in the die cavity is provided with a plurality of gas introduction ports, and
Wherein, be, make resin material import die cavity from the resin introducing port with device construction, and, begin successively to import gas by a plurality of gas introduction ports, begin gas earlier by the gas introduction port that is arranged on the zone that is full of resin material in the die cavity earlier and import.
The present invention's Coinjection molding apparatus in this respect, comprise the mould that is formed with a plurality of gas introduction ports, with this device construction be, begin successively to import, begin gas earlier by the gas introduction port that is arranged on the zone that is full of resin material in the die cavity earlier and import by the gas of a plurality of gas introduction ports.
By this configuration, same in the present invention in this respect, can make resin material press the preceding molded surface of die cavity, successively, begin by the zone that is full of resin material in the die cavity earlier.Like this, can at first pressurize to being full of the resin that forms cuticle region earlier.
Therefore, in this respect the Coinjection molding apparatus according to the present invention can prevent to produce strain regime effectively and for example shrink on the whole front surface of resin formed article.
Of the present invention first to the third aspect, resin formed article can be radiator grid, back decoration, lateral layering, steering-wheel cover, instrument board etc.In addition, the gas of injection moulding mould can be air or gases at high pressure such as nitrogen.
Equally, in whole die cavity, before the casting resin material, begin successively to import gas, begin the gas importing earlier by the gas introduction port that is arranged in the zone that is full of resin material in the die cavity earlier from gas introduction port.In the case, when the size of resin formed article is big relatively, and under long relatively situation of the time of resin material filling die cavity inside, effect is obvious especially.
Equally, each corresponding gas introduction port forms after the position in resin material is filled to die cavity, can begin immediately to import gas by gas introduction port.
Equally, any that imports that gas also can be from a plurality of gas introduction ports by gas introduction port begins simultaneously.In the case, gas is imported the timing in zone between any and the remaining gas introducing port in a plurality of gas introduction ports, can guarantee action effect as hereinbefore by staggering.
Equally, when carrying out gas by gas introduction port when importing, preferably, when other gas introduction ports begin gas when importing successively, the gas introduction port that at first begins to import gas is still worked.Then, preferably, after whole die cavity is by the resin material filling, make the operation continuation scheduled time that imports gas from a plurality of gas introduction ports.
Equally, in a first aspect of the present invention, preferably, resin formed article comprises plate-like body and the wall of holding up from described plate-like body rear surface, die cavity comprises the body die cavity that is used for the moulding plate-like body and is used for the wall die cavity of moulding wall, the body die cavity is formed with a plurality of closed spaces, this closed space is by wall die cavity area surrounded, and, part corresponding to aftershaping surface in a plurality of closed spaces, a plurality of gas introduction ports are set, and resin material imported the described die cavity from described resin introducing port, when each closed space inside is full of by this resin material, be arranged on the moment that begins to import gas near the gas introduction port in the closed space of resin introducing port, early than the gas introduction port that is arranged in resin introducing port closed space far away.
Equally, in a third aspect of the present invention, preferably, resin formed article comprises plate-like body and the wall of holding up from the plate-like body rear surface, die cavity comprises the body die cavity that is used for the moulding plate-like body and is used for the wall die cavity of moulding wall, the body die cavity is formed with a plurality of closed spaces, this closed space is by wall die cavity area surrounded, and, part corresponding to aftershaping surface in a plurality of closed spaces, a plurality of gas introduction ports are set, and are, make resin material import die cavity from the resin introducing port with this device construction, and, when each closed space inside is full of this resin material, begin to import gas successively, begin by the gas introduction port that is arranged in the zone that is full of this resin material in the die cavity earlier.
In the case, can form resin formed article, effectively prevent from whole front surface, to produce strain regime simultaneously and for example shrink with wall of holding up from the plate-like body rear surface.That is,, filling can be entered the preceding molded surface that resin material in the die cavity is pressed onto die cavity by being arranged on the gas introduction port in each closed space.Reason can formerly be full of before a large amount of epidermises of the interior generation of closed space of resin material thus, carries out the pressurization of resin material by gas, for example shrinks thereby can effectively prevent to produce strain regime.
Equally, when carrying out the importing of gas, by inserting the resin material in the wall die cavity, can stop gas (this gas imports the zone between the aftershaping surface and the resin material of inserting closed space the closed space from gas introduction port) to arrive aftershaping surface in the contiguous closed space and insert zone between the interior resin material of closed space.
Equally, in a first aspect of the present invention, can be after the inside of one of closed space be full of resin material at least, and before by the whole die cavity of this resin material filling, begin to import gas by gas introduction port.
In the case, in die cavity, generate before a large amount of epidermises, can easily this resin material be pressed onto the preceding molded surface of die cavity.
Equally, in a second aspect of the present invention, preferably, resin formed article comprises plate-like body and the wall of holding up from the plate-like body rear surface, die cavity comprises the body die cavity that is used for the moulding plate-like body and is used for the wall die cavity of moulding wall, the body die cavity is formed with closed space in its part, this closed space is by described wall die cavity area surrounded, and, corresponding to aftershaping surface in the closed space, gas introduction port is set, and, resin material in flowing in die cavity is full of after the closed space, before whole this resin material of die cavity filling, begins to import gas.
In the case, in die cavity, generate before a large amount of epidermises, can easily this resin material be pressed onto the preceding molded surface of die cavity.
Equally, in a second aspect of the present invention, preferably, resin formed article comprises plate-like body and the wall of holding up from the plate-like body rear surface, die cavity comprises the body die cavity that is used for the moulding plate-like body and is used for the wall die cavity of moulding wall, the body die cavity is formed with a plurality of closed spaces, this closed space is by wall die cavity area surrounded, and the part corresponding to aftershaping surface in a plurality of closed spaces is provided with a plurality of gas introduction ports, and, resin material in flowing in die cavity is full of after the inside of one of closed space, and before whole this resin material of die cavity filling, begins to import gas.
In the case, in die cavity, generate before a large amount of epidermises, can easily this resin material be pressed onto the preceding molded surface of die cavity.
Equally, in a third aspect of the present invention, preferably, with device construction be, be full of the closed space inside that is provided with corresponding gas introduction port with resin material after, and before this resin material is full of next closed space inside, begin to import gas by gas introduction port.
In the case, each closed space inside is full of resin material at every turn, begins to import gas from gas introduction port.By this configuration, by inserting the preceding molded surface that the resin material of each closed space in the die cavity is pressed onto die cavity, and before generating a large amount of epidermises, carry out the pressurization of resin material with gas, can prevent from whole resin formed article front surface, to produce strain regime effectively and for example shrink.
Equally, in a third aspect of the present invention, preferably, be, begin successively to import gas, begin by being arranged in the gas introduction port of the described resin introducing port stroke of resin material distance than short zone by gas introduction port with device construction.
In the case, can carry out gas and import according to resin material by each regional order in the die cavity.
Equally, the zone or the closed space that at first are full of by resin material can be, from the resin material of resin introducing port by length short zone or closed space.
Equally, of the present invention first to the third aspect, after the inside of the closed space that is provided with corresponding gas introduction port is full of by resin material, gets started by gas introduction port and import gas.In the case, after closed space inside is full of by resin material, in closed space, generate before a large amount of epidermises, begin gas immediately and import.
Equally, by being arranged on the sensor in the mould, the flow regime of resin material in the monitoring die cavity.Like this, sensor detects resin material and is full of closed space inside, and when above-mentioned testing result occurred, the gas introduction port that begins from be arranged on closed space imported gas.
Equally, under predetermined injection moulding condition, when known resin material is full of the time of each closed space inside, can beginning resin material to be imported die cavity from the resin introducing port and after the scheduled time in the past, begin to import gas from each gas introduction port.
A fourth aspect of the present invention provides a kind of resin formed article manufacture method, be used to make the resin formed article of the lug boss that comprises ring shaped cross-section, lug boss is from the rear surface projection of plate-like body, use is formed with the mould of body die cavity and lug boss die cavity, the body die cavity is used for the moulding plate-like body, and the lug boss die cavity is used for the moulding lug boss; Mould comprises inboard gas nozzle and outer side gas nozzles, this inboard gas nozzle is arranged on the inboard forming wall inside of described lug boss die cavity, inboard forming wall is used to form the interior week of described lug boss, this outer side gas nozzles is arranged on the aftershaping surface of described body die cavity, the aftershaping surface is used for the rear surface of the described plate-like body of moulding, and this method comprises:
With the inside of resin material filling body die cavity and lug boss die cavity,
By from outer side gas nozzles gas being annotated aftershaping surface and being filled in zone between the resin material in the body die cavity, make resin material press the preceding molded surface of body die cavity, preceding molded surface is used for the front surface of moulding plate-like body; And
By gas being annotated the first end surfaces of inboard forming wall and facing to the zone between the resin material of this elder generation's end surfaces, is made resin material press preceding molded surface from inboard gas nozzle.
In the present invention's resin formed article manufacture method in this respect, use the mould that is provided with inboard gas nozzle and outer side gas nozzles.Like this, by the timing of design, can effectively prevent from the resin material front surface, to produce strain regime and for example shrink from inboard gas nozzle and outer side gas nozzles gas jet.
When making resin formed article, at first, the inside of body die cavity and lug boss die cavity is by the resin material filling.At this moment, via the body die cavity, can carry out by the filling of resin material to the lug boss die cavity.
Then, gas is injected body die cavity aftershaping surface and insert zone between the resin material in the body die cavity from outer side gas nozzles.At this moment, the resin material in the body die cavity presses the preceding molded surface of body die cavity.
Then, gas is injected the first end surfaces of inboard forming wall and facing to the zone between the resin material of first end surfaces from inboard gas nozzle.At this moment, the resin material in the body die cavity presses preceding molded surface.
By this configuration, in the present invention in this respect, be positioned under the state of preceding molded surface that near the lug boss die cavity periphery resin material presses the body die cavity, pressing the preceding molded surface of body die cavity facing to the resin material of inboard forming wall elder generation end surfaces (being positioned at the resin material on all sides of lug boss die cavity).
Therefore, when the resin formed article by the present invention's manufacture method molding in this respect, can effectively prevent from the front surface that forms the position corresponding to whole lug boss, to produce strain regime and for example shrink (indenture that forms on the surface).
A fifth aspect of the present invention provides a kind of resin formed article manufacturing installation, is used to make the resin formed article of the lug boss with annular cross section, and lug boss is from the rear surface projection of plate-like body, and this device comprises:
Mould is formed with body die cavity and lug boss die cavity, and the body die cavity is used for the moulding plate-like body, and the lug boss die cavity is used for the moulding lug boss;
Inboard gas nozzle is arranged in the inboard forming wall, and this inboard forming wall forms the interior week of lug boss die cavity; And
Outer side gas nozzles is arranged in the aftershaping surface of body die cavity, and this aftershaping surface is used for the rear surface of moulding plate-like body,
Wherein, with device construction be, by outer side gas nozzles gas is being injected after aftershaping surface and filling enter zone between the resin material in the body die cavity, gas is being injected the first end surfaces of inboard forming wall and face toward zone between the resin material of described first end surfaces by inboard gas nozzle.
The manufacturing installation of the present invention's resin formed article in this respect (comprising the mould that is provided with inboard gas nozzle and outer side gas nozzles) is configured to: after the zone between the aftershaping surface of gas being injected the body die cavity by outer side gas nozzles and the resin material that charges in the body die cavity, gas is injected the first end surfaces of inboard forming wall and face toward zone between the resin material of first end surfaces by inboard gas nozzle.
By this configuration, in the present invention in this respect, equally, in that resin material far away presses under the state of molded surface before the body die cavity than lug boss die cavity from outer circumferential side, can press the preceding molded surface of body die cavity facing to the resin material (being positioned at the resin material of all sides of lug boss die cavity) of the first end surfaces of inboard forming wall.
Therefore, in resin formed article, can prevent effectively that producing strain regime on the front surface that forms the position corresponding to whole lug boss for example shrinks by the present invention's manufacturing installation molding in this respect.
The the of the present invention the 4th and the 5th aspect relates to a kind of method and apparatus that is used to make resin formed article, and this resin formed article has from the lug boss of the annular cross section of the rear surface projection of plate-like body.
In aspect the of the present invention the 4th and the 5th, resin formed article can be radiator grid, back decoration, lateral layering, steering-wheel cover, instrument board etc.
Equally, can be with lug boss as the installation portion that resin formed article is installed on other parts.Using under the situation of lug boss as installation portion, for example, can on the interior week of lug boss, form screwed hole, and the screw that will be arranged on other parts is screwed into screwed hole.
Equally, plate-like body is not the integral body that must form resin formed article, and it also can form a part of resin formed article.Plate-like body is being formed under the situation of a resin formed article part, as will be described hereinafter, preferably, the plate-like body type becomes by surrounding from the protrusion walls of protrusion of surface thereafter and forms.
Equally, the gas of injection moulding mould can be for example air of gases at high pressure.
From of the beginning timing of inboard gas nozzle, can be located at after the gas of outer side gas nozzles injection is diffused into the full week of body die cavity outer circumferential side gas injection moulding mould.Equally, from inboard gas nozzle regularly with the beginning of gas injection moulding mould, also can be located between gas aftershaping surface that diffuses into the body die cavity and the resin material that charges in the body die cavity regional whole after.
Equally, in a fourth aspect of the present invention, preferably, plate-like body is surrounded by the protrusion walls from protrusion of surface thereafter, the protrusion walls die cavity and the body die cavity that are used for the shaped projection wall form continuously, and, when the inside of resin material filling body die cavity, the inside of protrusion walls die cavity also filling this resin material.Equally, in a fifth aspect of the present invention, preferably, plate-like body is surrounded by the protrusion walls from protrusion of surface thereafter, and the protrusion walls die cavity and the body die cavity that are used for the shaped projection wall form continuously.
In these cases, by the resin material of filling protrusion walls die cavity inside, can easily stop the preceding molded surface of gas (zone between the aftershaping surface of injecting the body die cavity from outer side gas nozzles and the resin material that charges in the body die cavity) arrival body die cavity.
Equally, in a fourth aspect of the present invention, preferably, at the base portion of lug boss die cavity periphery, be formed for forming the rib die cavity that lug boss base portion place strengthens rib, and, when the inside of resin material filling body die cavity and lug boss die cavity, the inside of rib die cavity is this resin material of filling also.Equally, in a fifth aspect of the present invention, preferably,, be formed for forming the rib die cavity that lug boss base portion place strengthens rib at the base portion of lug boss die cavity periphery.
In these cases, in the resin formed article of molding, by strengthening the base portion that rib can strengthen lug boss.
Description of drawings
Fig. 1 is the shaft side figure that illustrates according to the resin formed article of first embodiment;
Fig. 2 is a vertical view, and the formation according to die cavity in the mould of the Coinjection molding apparatus of first embodiment is shown;
Fig. 3 is a cutaway view, illustrates along arrow A direction among Fig. 2, the Coinjection molding apparatus of first embodiment;
Fig. 4 is a vertical view, illustrates according to first embodiment, and the state of die cavity is that central closed space inside is full of resin material, and the gas introduction port from be arranged on central closed space imports gas;
Fig. 5 is a cutaway view, illustrates along arrow A direction among Fig. 4, according to the Coinjection molding apparatus of first embodiment;
Fig. 6 is a vertical view, illustrates according to first embodiment, and the state of die cavity is that closed space inside, middle part is full of resin material, and the gas introduction port from be arranged on the middle part closed space imports gas;
Fig. 7 is a cutaway view, illustrates along arrow A direction among Fig. 6, according to the Coinjection molding apparatus of first embodiment;
Fig. 8 is a vertical view, illustrates according to first embodiment, and the state of die cavity is that the closed end interior volume is full of resin material, and the gas introduction port from be arranged on the closed end space imports gas;
Fig. 9 is a cutaway view, illustrates along arrow A direction among Fig. 8, according to the Coinjection molding apparatus of first embodiment;
Figure 10 is the shaft side figure according to the resin formed article of second embodiment;
Figure 11 is the cutaway view according to the manufacturing installation of the resin formed article of second embodiment;
Figure 12 is a cutaway view, and the manufacturing installation according to the resin formed article of second embodiment is shown, and is in the state of resin material filling mould inside;
Figure 13 is a cutaway view, and the manufacturing installation according to the resin formed article of second embodiment is shown, and is in from the state of outer side gas nozzles with gas injection moulding mould;
Figure 14 is a cutaway view, and the manufacturing installation according to the resin formed article of second embodiment is shown, and is in from the state of inboard gas nozzle with gas injection moulding mould;
Figure 15 is the shaft side figure according to another resin formed article of second embodiment;
Figure 16 is a cutaway view, and the manufacturing installation according to comparative example 1 is shown, and is in such state, only from inboard gas nozzle injected gas, and has produced contraction;
Figure 17 is a cutaway view, and the manufacturing installation according to comparative example 1 is shown, and is in such state, only from inboard gas nozzle injected gas, and has formed hollow space; And
Figure 18 is a cutaway view, and the manufacturing installation according to comparative example 2 is shown, and is in such state, only from the outer side gas nozzles injected gas, and has produced contraction.
The specific embodiment
First embodiment
Below, with reference to the accompanying drawings, description is related to first embodiment of injection moulding method of the present invention and Coinjection molding apparatus.
As shown in Figure 1 to Figure 3, the injection moulding method of first embodiment and Coinjection molding apparatus 1 use mould 2, and mould is provided with a plurality of gas introduction ports 4 that are used to import gas G, and gas is extrusion resin material 80 in die cavity 20.Like this,, can effectively avoid on the front surface 801 of resin formed article 8, producing strain regime, for example shrink or shrink trace by gas G is designed from the timing that each gas introduction port 4 sprays.
As shown in Figures 2 and 3, the Coinjection molding apparatus 1 of first embodiment comprises: mould 2 and resin introducing port 23, thereby mould 2 is provided with the die cavity 20 that casting resin material 80 obtains resin formed article 8, by resin introducing port 23 resin material 80 is imported in the die cavity 20.
The die cavity 20 aftershaping surfaces 202 that are used to form resin formed article 8 rear surfaces 802 are provided with gas introduction port 4, by gas introduction port 4, gas G are imported the aftershaping surface 202 of die cavity 20 inside and the zone between the resin material 80.Along resin materials 80 in the die cavity 20 pass through direction L, a plurality of gas introduction ports 4 are set.
,, the time, molten resin material 80 is imported the die cavity 20 from resin introducing port 23 to shown in Figure 9 as Fig. 4 with Coinjection molding apparatus 1 processing and forming resin formed article 8.Then, when resin material 80 filling die cavitys 20 inside,, make gas introduction port 4 begin to import gas G near resin introducing port 23 early than gas introduction port 4 away from resin introducing port 23.In first embodiment, the importing of gas G is that order begins, by gas introduction port 4 beginnings that are arranged at die cavity 20 interior zones that at first are full of resin material 80.By this structure, begin by die cavity 20 interior zones that at first are full of resin material 80, resin material 80 is molded surface 201 before die cavity 20 inner orders press, and this preceding molded surface 201 is used to form the front surface 801 of resin formed article 8.
Below, according to Fig. 1 to Fig. 9, will describe injection moulding method and the Coinjection molding apparatus 1 of first embodiment in detail.
As shown in Figure 1, the resin formed article 8 of molding comprises among first embodiment: plate-like body 81 and the wall of holding up from plate-like body 81 rear surfaces 802 82.Equally, be formed for resin formed article 8 is installed to the lug boss 812 of other assemblies etc., this lug boss 812 is from rear surface 802 projections of plate-like body 81.Lug boss 812 has ring shaped cross-section.Thereby in injection molding resin formed article 8, screw hole (placing the screw of another parts to screw in wherein) can be formed on the interior week of lug boss 812.
As shown in Figure 1, the plate-like body 81 of first embodiment comprises a plurality of body assemblies that extend 811 on left and right directions W, a plurality of body assembly 811 parallel formation, and in the connection of the left and right end portions place of plate-like body 81.The periphery wall 821 of first embodiment is formed on the both sides of the above-below direction H of body assembly 811, and on left and right directions W, the isolation wall of holding up from the rear surface 802 of each body assembly 811 822 is formed on more than 811 position of body assembly.
As shown in Figures 2 and 3, the die cavity 20 of first embodiment comprises: be used for moulding plate-like body 81 body die cavity 21, be used for the wall chamber 22 of moulding wall 82 and be used for the lug boss chamber 212 of moulding lug boss 812.Equally, body die cavity 21 comprises a plurality of closed spaces 3 that are formed on wherein, and closed space 3 is by wall chamber 22 area surrounded.
The body die cavity 21 of first embodiment comprises a plurality of die cavity formation portions 211 that are used for contoured body assembly 811.Equally, wall chamber 22 comprises the periphery wall chamber 221 that is used for moulding periphery wall 821 and is used for the isolation wall chamber 222 that wall 822 is isolated in moulding.
As shown in Figures 2 and 3, the closed space 3 of first embodiment forms by periphery wall chamber 221 and isolates wall chamber 222 area surrounded.A plurality of closed spaces 3 are formed on the left and right directions W of die cavity 20.The closed space 3 of first embodiment comprises at the central closed space 31 of body die cavity 21 central authorities, in the closed end space 33 at each place, ends of left and right directions W upper body die cavity 21 be formed on middle part closed space 32 between central closed space 31 and the closed end space 33.
In addition, on the left side and right side of body die cavity 21, form a plurality of central closed spaces 31 and middle part closed space 32, with corresponding to a plurality of die cavity formation portion 211.
In addition, in each closed end space 33, form the lug boss chamber 212 of a plurality of first embodiment.
In addition, with the order in central closed space 31, middle part closed space 32 and closed end space 33, resin material 80 increases successively from the length of passing through of resin introducing port 23.
In addition, as shown in Figures 2 and 3, the resin introducing port 23 of first embodiment is arranged in the middle body of die cavity 20, makes the resin material 80 that imports from resin introducing port 23, separates the die cavity 20 of filling first embodiment in left and right directions W upper pathway.Equally, the resin introducing port 23 of first embodiment is arranged in each of a plurality of die cavity formation portion 211, and resin material 80 fluids that will import from the resin introducing port 23 of correspondence separately flow to the end of die cavity 20 on left and right directions W.
Each gas introduction port 4 comprises gap 43, imports gas G by gap 43, between the cylindrical body 42 that to be formed at the gas passage orifices 41 on the die cavity 20 aftershaping surfaces 202 with being arranged in gas passage orifices 41 interior of gap 43.
The first embodiment Coinjection molding apparatus 1 that is used for injection-molded resin moulded products 8, the injection pressure of the resin material 80 of injection moulding mould 2 is set to, for example, 30MPa to 50MPa, and, the heating-up temperature of the resin material 80 of injection moulding mould 2 is set to, for example, and 200 ℃ to 250 ℃.In addition, the gas G that imports die cavity 20 from each gas introduction port 4 is the gases at high pressure of 5MPa to 15MPa.
Although do not illustrate, each gas introduction port 4 is configured to, gas G is sprayed from it, and utilize the valve of switching gas G circulation path to regulate injection.In addition, can pass through for example sequencer (cyclelog) of control device, the timing that control gas G sprays from each gas introduction port 4.
Like this, control method in the Coinjection molding apparatus 1 is set to, when resin material 80 orders that import die cavity 20 from resin introducing port 23 charged into closed space 3 inside, gas introduction port 4 beginnings by forming in the closed space 3 that formerly is full of this resin material 80 began to import gas G successively.More particularly, the control method of first embodiment is set to, closed space 3 is full of 80 each moment of resin material, just import gas G from gas introduction port 4, its order is, closed space 3 near resin introducing port 23 promptly, is full of the order in central closed space 31, middle part closed space 32 and the closed end space 33 of resin material 80.
Below, will be described in more detail below the method for using Coinjection molding apparatus 1 to come processing and forming resin formed article 8.
When injection-molded resin moulded products 8, as shown in Figure 4 and Figure 5, molten resin material 80 imports each die cavity formation portion 211 of die cavity 20 from a plurality of resin introducing ports 23.At this moment, resin material 80 flows to the left part and the right part of each die cavity formation portion 211 from each resin introducing port 23.
Then, shown in identical diagram, in each die cavity formation portion 211, inside when central closed space 31, and the inside that is positioned at the wall chamber 22 around the central closed space 31, all be full of resin material 80, promptly, when the mobile tip 80A of resin material 80 was filled to the inside of the first isolation wall chamber 222A, control device began to import gas G from the gas introduction port 4A that is arranged at central closed space 31.
At this moment, resin material 80 is in die cavity 20 internal flows, simultaneously, gas G injects the zone between the interior resin material 80 of central closed space 31 aftershapings surface 202 and central closed space 31, makes resin material 80 press preceding molded surface 201 in the central closed space 31.
In addition, by resin material 80 being full of the inside of the first isolation wall chamber 222A, the gas G that stops the gas introduction port 4A from be arranged on central closed space 31 to import arrives and closes in the middle part closed space 32 of central closed space 31.
Then, as shown in Figure 6 and Figure 7, in each die cavity formation portion 211, inner and be positioned at 22 inside, wall chamber around the middle part closed space 32 when middle part closed space 32, when all being full of resin material 80, that is, when the mobile tip of resin material 80 was filled to the second isolation wall chamber 222B inside, control device began to import gas G from the gas introduction port 4B that is arranged at middle part closed space 32.
At this moment, resin material 80 is in die cavity 20 internal flows, simultaneously, gas G injects the zone between the resin material 80 in closed space 32 aftershapings surface 202, middle part and the middle part closed space 32, make resin material 80 press in the middle part of preceding molded surface 201 in the closed space 32.
Equally, by being full of second resin material 80 of isolating 222B inside, wall chamber, the gas G that stops the gas introduction port 4B from be arranged on middle part closed space 32 to import arrives 33 inside, closed end space of closing on middle part closed space 32.
Then, as Fig. 8 and shown in Figure 9, when the inside in closed end space 33 be positioned at 22 inside, wall chamber and each 212 inside, lug boss chamber around the closed end space 33, when all being full of resin material 80, promptly, when the whole die cavity 20 of resin material 80 fillings, control device begins to import gas G from the gas introduction port 4C that is arranged at closed end space 33.
At this moment, gas G is ejected in the zone between the resin material 80 in closed end space 33 aftershaping surface 202 and the closed end space 33, makes resin material 80 press preceding molded surface 201 in the closed end space 33.
When gas G being imported in the closed space 32 of middle part, keep that gas G is imported in the central closed space 31, and, when importing gas G in the closed end space 33, keep that gas G is imported central closed space 31 and middle part closed space 32.Then, after resin material 80 is full of whole die cavity 20, by gas G from all gas introducing port 4A, 4B and 4C injection, in all closed spaces 3, the scheduled time of state maintenance of molded surface 201 before resin material 80 is pressed, and make resin material 80 coolings and curing, thereby form resin formed article 8.
By this way, in first embodiment, when resin material 80 filling die cavitys 20 inside, in die cavity 20 inside, gas introduction port 4A and 4B in the closed space 3 that formerly is full of resin material 80 are set, begin earlier in the zone between the resin material 80 in gas G importing die cavity 20 aftershapings surface 202 and the die cavity 20.By this configuration, closed space 3 beginnings by being full of resin material 80 in the die cavity 20 earlier make resin material 80 press the preceding molded surface 201 of die cavity 20 successively.
Reason thus, in first embodiment, at first, be full of earlier in die cavity 20 in the closed space 3 of resin material 80 and produce epidermis (cured portion of resin material 80), this epidermis is formed on the molten resin surface that contacts with die cavity 20 molded surfaces (preceding molded surface 201 and aftershaping surface 202).
Like this,, before generating too many epidermis, carry out the aforementioned pressurization of resin material 80, can prevent to produce strain regime effectively and for example shrink with gas G by in the closed space 3 that at first is full of resin material 80.
Equally, be formed on the rear surface 802 of resin formed article 8 when isolating wall (enhancing rib) 822, strain regime is for example shunk to be easy to generate and is being formed on the front surface 801 of position corresponding to isolating wall 822.As countermeasure, as previously mentioned, before the generation of the epidermis on the resin material in being full of die cavity 20 80, before being pressed onto the resin material 80 in each closed space 3, order on the molded surface 201, can prevent effectively that producing strain regime on the front surface 801 that forms positions corresponding to isolation wall 822 for example shrinks.
Therefore, according to first embodiment, can prevent effectively that strain regime from for example shrinking on the whole front surface 801 that (being formed on lip-deep indenture) be created in resin formed article 8.Equally, aforementioned injection moulding method and Coinjection molding apparatus 1 are particularly suitable for carrying out large scale and than the injection moulding of long resin moulded products 8.
Aforementioned injection moulding method and Coinjection molding apparatus 1 not only go for radiator grid, and are applicable to by carrying out the various kinds of resin moulded products that the resin injection moulding obtains.Like this, same, when carrying out the injection moulding of various kinds of resin moulded products, a plurality of gas introduction ports 4 are set by the direction L that passes through along resin material in the die cavity 80, by carrying out foregoing same operation, can obtain foregoing same action effect.
Second embodiment
Below, with reference to the accompanying drawings, description is related to second embodiment of injection moulding method and Coinjection molding apparatus according to the present invention.
In the manufacture method and manufacturing installation 101 of the resin formed article 8 of second embodiment, as shown in figure 10, make the resin formed article 108 that comprises annular cross section lug boss 182, lug boss 182 is from rear surface 902 projections of plate-like body 181.
As shown in figure 11, manufacturing installation 101 comprises: mould 102 wherein is formed with the body die cavity 121 that is used to form plate-like body 181; And lug boss die cavity 122, be used to form lug boss 182.In mould 102, in forming lug boss die cavity 122, in the inboard forming wall 123 in week 331, inboard gas nozzle 103 is set, and, body die cavity 121 aftershaping surfaces 302 being used for moulding plate-like body 181 rear surfaces 902 are provided with outer side gas nozzles 104.
Then, when using manufacturing installation 101 moulding resin moulded products 108, at first, and as shown in figure 12, by the inside of resin material 180 filling body die cavitys 121 and lug boss die cavity 122.
Then, as shown in figure 13, by the zone between the resin material 180 in outer side gas nozzles 104 is ejected into gas G body die cavity 121 aftershapings surface 302 and filling body die cavity 121, resin material 180 is pressed be used for the body die cavity 121 preceding molded surfaces 301 of moulding plate-like body 181 front surfaces 901.Then, as shown in figure 14, by molded surface 123 first end surfaces 333 in from inboard gas nozzle 103 gas G being ejected into and facing to the zone between the resin material 180 of first end surfaces 333, make resin material 180 press the preceding molded surface 301 of body die cavity 121.
Below, according to Figure 10 to Figure 15, will describe the manufacture method and the manufacturing installation 101 of resin formed article 108 in detail.
In resin formed article 108 manufacture methods of second embodiment, by the timing of design, can prevent from resin formed article 108 front surfaces 901, to produce strain regime effectively and for example shrink (being formed on lip-deep indenture) from inboard gas nozzle 103 and outer side gas nozzles 104 gas jet G.
Manufacturing installation 101 is used to carry out the injection moulding of resin formed article 108.The injection pressure of resin material 180 injection moulding moulds 102 is set at, for example, 30MPa to 50MPa, and, the heating-up temperature of resin material 180 injection moulding moulds 102 is set at, for example, 200 ℃ to 250 ℃.In addition, the gas G from inboard gas nozzle 103 and outer side gas nozzles 104 injections is the gases at high pressure of 5MPa to 15MPa.
Although do not illustrate, inboard gas nozzle 103 and outer side gas nozzles 104 are configured to, carrying out the injection of gas G, and utilize the valve of switching gas G circulation path, regulate and spray.Equally, can pass through for example sequencer (cyclelog) of control method, control gas G is from the timing of inboard gas nozzle 103 and outer side gas nozzles 104 injections.
Then, control method in the manufacturing installation 101 is configured to, in the following manner by the inside of resin material 180 filling body die cavitys 121, after passing by at the fixed time, from outer side gas nozzles 104 gas G is spurted into mould 102, and then, after the scheduled time after this sprays, gas G is spurted into mould 102 from inboard gas nozzle 103.
Begin gas G to be spurted into the timing of mould 102 from outer side gas nozzles 104, can be after whole body die cavity 121 of resin material 180 fillings and lug boss die cavity 122.Equally, begin gas G to be spurted into the timing of mould 102, can begin at the surface portion (contacting) of for example molten resin to solidify and begin to form epidermis (cured portion) afterwards with the surface of mould 102 from inboard gas nozzle 103.Begin gas G to be spurted into the timing of mould 102 from inboard gas nozzle 103, can be for example when 1 second to 5 seconds after outer side gas nozzles 104 beginning gas jet G.
As shown in figure 11, inboard gas nozzle 103 comprises gap 343A, gas G passes through from gap 343A, the gas passage orifices 341A of formation and being arranged between the cylinder 342A among the gas passage orifices 341A in inboard forming wall 123 (form lug boss die cavity 122 interior all 331) forms this gap 343A.Equally, outer side gas nozzles 104 comprises gap 343B, makes gas G from gap 343B process, and the gas passage orifices 341B that forms on body die cavity 121 aftershaping surfaces and being arranged between the cylinder 342B among the gas passage orifices 341B forms this gap 343B.
The outer side gas nozzles 104 of second embodiment is formed on the part in the body die cavity 121.But, outer side gas nozzles 104 can be formed on a plurality of parts of body die cavity 121.
Equally, as shown in figure 10, protrusion walls 911 forms around plate-like body 181, and protrusion walls 911 is from plate-like body 181 rear surfaces 902 upper process of the resin formed article 8 of moulding in a second embodiment.Like this, the full week of plate-like body 181 rear surfaces 902 is surrounded by protrusion walls 911.
Equally, as shown in figure 11, the protrusion walls die cavity 311 that is used for shaped projection wall 911 is formed on body die cavity 121 continuously.
As shown in figure 15, can be at the base portion of lug boss die cavity 122 peripheries 332, be formed for being molded over the rib die cavity 125 of the enhancing rib 185 at lug boss 182 base portion places.In the case, when resin material 180 filling body die cavitys 121 and lug boss die cavity 122 inside, also make resin material 180 filling rib die cavitys 125 inside, in the resin formed article 108 of molding, the base portion of lug boss 182 can be enhanced by strengthening rib 185.
In a second embodiment, when making resin formed article 108, the resin material 180 of the also fusion of being heated injects body die cavity 121 from the injection portion (not shown) that is connected in body die cavity 121.Then, as shown in figure 12, resin material 180 is filling body die cavity 121 inside not only, and filling protrusion walls die cavity 311 inside, and filling lug boss die cavity 122 inside.
Then, as shown in figure 13, gas G is from the zone of outer side gas nozzles 104 injections between body die cavity 121 aftershapings surface 302 and the resin material 180 of filling in body die cavity 121.At this moment, gas G enters body die cavity 121 aftershapings surface 302 and the zone that faces toward between the resin material 180 on aftershaping surface 302 from the diffusion of the installation site of outer side gas nozzles 104.Like this, enter resin material 180 in the lug boss die cavity 122, stop gas G to enter the periphery 332 and the zone that faces toward between the resin material 180 of periphery 332 of lug boss die cavity 122 by filling.Equally, enter resin material 180 in the protrusion walls die cavity 311, stop gas G to enter the preceding molded surface 301 of body die cavity 121 by filling.
By this way, shown in phase diagram, the aftershaping surface 302 by gas G injects body die cavity 121 makes body die cavity 121 interior resin materials 180 press the preceding molded surface 301 of body die cavity 121.
Then, as shown in figure 14, after the stipulated time after outer side gas nozzles 104 beginning gas jet G, gas G is injected into the first end surfaces 333 of inboard forming wall 123 and faces toward zone between the resin material 180 of first end surfaces 333 from inboard gas nozzle 103.At this moment, resin material 180 parts that face toward inboard forming wall 123 first end surfaces 333 have begun to solidify, and begin to form epidermis.Therefore, between the gas G (not entering the inside of resin materials 180 in the body die cavity 121) of inboard gas nozzle 103 injections first end surfaces 333 that rests on inboard forming wall 123 and the epidermis that faces toward on the resin material 180 of first end surfaces 333.
In a second embodiment, when when inboard gas nozzle 103 is injected into mould 102 with gas G, keeps from outer side gas nozzles 104 gas G is injected into mould 102.
By this way, shown in phase diagram,, make the preceding molded surface 301 that presses body die cavity 121 facing to resin material 180 parts of inboard forming wall 123 first end surfaces 333 by injecting the gas G of inboard forming wall 123 first end surfaces 333.
By this way, in a second embodiment, press under the state of molded surface 301 before the body die cavity 121 at resin material 180 (far away than lug boss die cavity 122), can press the preceding molded surface 301 of body die cavity 121 facing to the resin material 180 (being positioned at the resin material 180 of lug boss die cavity 122 all sides) of inboard forming wall 123 first end surfaces 333 apart from outer circumferential side.
Therefore, when passing through the manufacture method moulding resin moulded products 108 of second embodiment, can prevent effectively that producing strain regime on the front surface 901 that forms positions corresponding to whole lug boss 82 for example shrinks.
(comparative example)
In comparative example, be illustrated in moulding resin moulded products 109 (109A, 109B, the state that strain regime is for example shunk takes place in the time of 109C), as Figure 16 and Figure 17, do not show and go into mould 192A from outer side gas nozzles 104 injected gas G, only go into the situation (comparative example 1) of mould 192A from inboard gas nozzle 103 injected gas G, and, as Figure 18, only illustrate and go into mould 192B, do not go into the situation (comparative example 2) of mould 192B from inboard gas nozzle 103 injected gas G from outer side gas nozzles 104 injected gas G.
Equally, as shown in figure 16, under the situation of comparative example 1, when moulding resin moulded products 109A, although not be positioned at lug boss 182 all sides 921 on corresponding front surface 901 positions of resin part on the generation strain regime for example shrink etc., but, on front surface 901 positions corresponding, produce and shrink H with the resin part of close lug boss 182 outer circumferential sides 922.
Equally, as shown in figure 17, under the situation of comparative example 1, if find from inboard gas nozzle 103 ahead of time injected gas G go into mould 102 (if before the resin material 180 facing to inboard forming wall 123 first end surfaces 333 forms epidermises, carry out injected gas G), gas G enters resin material 180 inside, and forms hollow space T in resin formed article 109B.
Equally, as shown in figure 18, under the situation of comparative example 2, when moulding resin moulded products 109C, although not be positioned at lug boss 182 outer circumferential sides 922 near corresponding front surface 901 positions of resin part on the generation strain regime for example shrink etc., but, on front surface 901 positions corresponding, produce and shrink H with the resin part of all sides 921 in the close lug boss 182.
From these conclusions as can be seen: resin formed article 109, in order to prevent that effectively producing strain regime on the front surface 901 of the whole lug boss of correspondence 182 formation positions for example shrinks, and must be configured to the manufacturing method and apparatus 101 of resin formed article 108 as describing shown in the example before this.
Claims (16)
1. injection moulding method, use is provided with the mould of die cavity and resin introducing port, resin material charges into described die cavity to obtain resin formed article, by described resin introducing port described resin material is imported described die cavity, wherein, on the aftershaping surface of described die cavity, form a plurality of gas introduction ports, import gas by described gas introduction port, described aftershaping surface is used for the rear surface of the described resin formed article of moulding, and, described gas is imported zone between the resin material in described aftershaping surface and the described die cavity, described injection moulding method may further comprise the steps:
From described resin introducing port described resin material is imported described die cavity; And,
When the described die cavity of described resin material filling, by importing gas from described gas introduction port, make described resin material press the preceding molded surface of described die cavity, this molded surface is used for the front surface of the described resin formed article of moulding, wherein, the gas introduction port near described resin introducing port begins the gas importing earlier than the described resin introducing port of distance gas introduction port far away.
2. injection moulding method according to claim 1, wherein said resin formed article comprises: plate-like body and the wall of holding up from described plate-like body rear surface,
Described die cavity comprises: is used to form the body die cavity of described plate-like body and is used to form the wall die cavity of described wall,
Described body die cavity is formed with a plurality of closed spaces, and this closed space is described wall die cavity area surrounded, and
Part corresponding to aftershaping surface described in described a plurality of closed spaces is provided with a plurality of described gas introduction ports, and
Wherein, described resin material imports the described die cavity from described resin introducing port, and, when the described resin material of each described closed space inner filling, the gas introduction port that is arranged in the close closed space of described resin introducing port begins the gas importing earlier than the gas introduction port that is arranged in described resin introducing port closed space far away.
3. injection moulding method according to claim 2 wherein, after at least one described closed space inside is full of described resin material, and before the described resin material of whole described die cavity filling, begins to import gas by described gas introduction port.
4. injection moulding method, use has the mould of die cavity and resin introducing port, the described die cavity of resin material filling is to obtain resin formed article, by described resin introducing port described resin material is imported described die cavity, wherein, on the aftershaping surface of described die cavity, form one or more gas introduction ports, import gas by described gas introduction port, this aftershaping surface is used for the rear surface of the described resin formed article of moulding, and, described gas is imported zone between the described resin material in described aftershaping surface and the described die cavity, and described injection moulding method may further comprise the steps:
Described resin material is imported described die cavity from described resin introducing port; And
When described resin material flows in described die cavity, by beginning described gas from least one described gas introduction port importing, make described resin material be pressed against the preceding molded surface of described die cavity, this preceding molded surface is used for the front surface of the described resin formed article of moulding.
5. injection moulding method according to claim 4, wherein said resin formed article comprise plate-like body and the wall of holding up from the rear surface of described plate-like body,
Described die cavity comprises: is used to form the body die cavity of described plate-like body and is used to form the wall die cavity of described wall,
Described body die cavity is formed with closed space in its part, this closed space is by described wall die cavity area surrounded, and
Described aftershaping surface corresponding in the described closed space is provided with described gas introduction port, and
Wherein, the described resin material in flowing in described die cavity is full of after the described closed space, and before the described resin material of whole described die cavity filling, begins to import described gas.
6. injection moulding method according to claim 4, wherein said resin formed article comprise plate-like body and the wall of holding up from the rear surface of described plate-like body,
Described die cavity comprises: is used to form the body die cavity of described plate-like body and is used to form the wall die cavity of described wall,
Described body die cavity is formed with a plurality of closed spaces, and this closed space is by described wall die cavity area surrounded, and
Part corresponding to aftershaping surface described in described a plurality of closed spaces is provided with a plurality of described gas introduction ports, and
Wherein, after the described resin material that flows in described die cavity inside is full of one of described closed space, and before whole described this resin material of die cavity filling, begin to import described gas.
7. Coinjection molding apparatus comprises:
Mould is provided with die cavity and resin introducing port, and the described die cavity of resin material filling imports described die cavity by described resin introducing port with described resin material to obtain resin formed article,
Wherein, on the aftershaping surface of described die cavity, form gas introduction port, import gas by described gas introduction port, this aftershaping surface is used for the rear surface of the described resin formed article of moulding, and, described gas is imported zone between the resin material in described aftershaping surface and the described die cavity
The direction of passing through along the described resin material in the described die cavity is provided with a plurality of gas introduction ports, and
Wherein, with described device construction be, make described resin material import described die cavity from described resin introducing port, and, begin successively to import, begin by the gas introduction port that is arranged in the zone that is full of described resin material in the described die cavity earlier by the gas of described a plurality of gas introduction ports.
8. Coinjection molding apparatus according to claim 7, wherein said resin formed article comprise plate-like body and the wall of holding up from the rear surface of plate-like body,
Described die cavity comprises: is used to form the body die cavity of described plate-like body and is used to form the wall die cavity of described wall,
Described body die cavity is formed with a plurality of closed spaces, and this closed space is by described wall die cavity area surrounded, and
Part corresponding to aftershaping surface described in described a plurality of closed spaces is provided with a plurality of described gas introduction ports, and
Wherein, with described device construction be, make described resin material import described die cavity from described resin introducing port, and, when the inside of each closed space is full of described resin material, begin to import gas successively, begin by the gas introduction port that is provided with in the described closed space that formerly is full of described resin material.
9. Coinjection molding apparatus according to claim 8, wherein be with described device construction, after the described closed space inside that is provided with described gas introduction port is full of described resin material, and, before described resin material is full of next closed space, begin to import described gas by described gas introduction port.
10. Coinjection molding apparatus according to claim 7, wherein be with described device construction, begin successively to import described gas, begin by being arranged in the gas introduction port of the described resin introducing port stroke of described resin material distance than short zone by described gas introduction port.
11. resin formed article manufacture method, be used to make the resin formed article of the lug boss that comprises ring shaped cross-section, described lug boss is from the rear surface projection of plate-like body, use is formed with the mould of body die cavity and lug boss die cavity, described body die cavity is used for the described plate-like body of moulding, and described lug boss die cavity is used for the described lug boss of moulding; Described mould comprises inboard gas nozzle and outer side gas nozzles, this inboard gas nozzle is arranged in the inboard forming wall of described lug boss die cavity, this inboard forming wall is used to form the interior week of described lug boss, this outer side gas nozzles is arranged in the aftershaping surface of described body die cavity, this aftershaping surface is used for the rear surface of the described plate-like body of moulding, and described method comprises:
With the inside of described body die cavity of resin material filling and described lug boss die cavity,
By from described outer side gas nozzles gas being injected described aftershaping surface and being filled in zone between the described resin material in the described body die cavity, make described resin material press the preceding molded surface of described body die cavity, this preceding molded surface is used to form the front surface of described plate-like body; And
By gas being injected the first end surfaces of described inboard forming wall and, makes described resin material press described preceding molded surface facing to the zone between the described resin material of described first end surfaces from described inboard gas nozzle.
12. resin formed article manufacture method according to claim 11, wherein
Described plate-like body is surrounded by the protrusion walls from protrusion of surface thereafter,
The protrusion walls die cavity and the described body die cavity that are used for the described protrusion walls of moulding form continuously, and,
When the inside of the described body die cavity of described resin material filling, the inside of described protrusion walls die cavity is this resin material of filling also.
13. resin formed article manufacture method according to claim 11 wherein, at the base portion of the periphery of described lug boss die cavity, forms the rib die cavity, this rib die cavity is used to form the enhancing rib at the base portion place of described lug boss, and,
When the inside of described body die cavity of described resin material filling and lug boss die cavity, the inside of described rib die cavity is the described resin material of filling also.
14. a resin formed article manufacturing installation is used to make the resin formed article of the lug boss that comprises annular cross section, this lug boss is from the rear surface projection of plate-like body, and described device comprises;
Mould is formed with body die cavity and lug boss die cavity, and described body die cavity is used for the described plate-like body of moulding, and described lug boss die cavity is used for the described lug boss of moulding;
Inboard gas nozzle is arranged in the inboard forming wall, and described inboard forming wall forms the interior week of described lug boss die cavity; And
Outer side gas nozzles is arranged in the aftershaping surface of described body die cavity, and described aftershaping surface is used to form the rear surface of described plate-like body,
Wherein, with described device construction be, after the zone of by described outer side gas nozzles gas being injected between described aftershaping surface and the described resin material that is filled in the described body die cavity, by described inboard gas nozzle gas is injected the first end surfaces of described inboard forming wall again and face toward zone between the described resin material of described first end surfaces.
15. resin formed article manufacturing installation according to claim 14, wherein
Described plate-like body is surrounded by the protrusion walls from protrusion of surface thereafter, and
The protrusion walls die cavity and the described body die cavity that are used for the described protrusion walls of moulding form continuously.
16. resin formed article manufacturing installation according to claim 14 wherein, on the base portion of the periphery of described lug boss die cavity, forms the rib die cavity, this rib die cavity is used to form the enhancing rib at the base portion place of described lug boss.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005345556 | 2005-11-30 | ||
| JP2005-345555 | 2005-11-30 | ||
| JP2005345555 | 2005-11-30 | ||
| JP2005-345556 | 2005-11-30 | ||
| JP2005345556A JP4650240B2 (en) | 2005-11-30 | 2005-11-30 | Injection molding method and injection molding apparatus |
| JP2005345555A JP4650239B2 (en) | 2005-11-30 | 2005-11-30 | Manufacturing method of resin molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1974175A true CN1974175A (en) | 2007-06-06 |
| CN1974175B CN1974175B (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101611224A Expired - Fee Related CN1974175B (en) | 2005-11-30 | 2006-11-30 | Injection molding method and injection molding apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4650239B2 (en) |
| CN (1) | CN1974175B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102712119A (en) * | 2010-01-13 | 2012-10-03 | 佳能株式会社 | Resin-molded component and resin-molding mold |
| CN111469933A (en) * | 2019-01-23 | 2020-07-31 | 丰田自动车株式会社 | Vehicle body structural member |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012020351A1 (en) * | 2012-05-15 | 2013-11-21 | Ulrich Stieler Kunststoff Service E.K. | Process for forming slide-less undercuts for attachment to plastic injection molded components |
| JP2015116272A (en) * | 2013-12-18 | 2015-06-25 | 豊丸産業株式会社 | Game member and game machine with game member |
| JP2018047583A (en) * | 2016-09-21 | 2018-03-29 | 日本精機株式会社 | Resin housing |
| JP7201443B2 (en) * | 2019-01-07 | 2023-01-10 | 本田技研工業株式会社 | GAS ASSIST MOLDING APPARATUS AND GAS ASSIST MOLDING METHOD |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59220337A (en) * | 1983-05-31 | 1984-12-11 | Ichikoh Ind Ltd | Injection molding method of molded article made of synthetic resin having boss part |
| JPS63281818A (en) * | 1987-05-14 | 1988-11-18 | Matsushita Electric Ind Co Ltd | injection mold equipment |
| JPH07223246A (en) * | 1994-02-14 | 1995-08-22 | Tohoku Munekata Kk | Method and apparatus for manufacturing injection-molded plastic products |
| JP3494500B2 (en) * | 1995-04-19 | 2004-02-09 | 出光石油化学株式会社 | Injection molding method and injection mold for automotive instrument panel |
| JP3548297B2 (en) * | 1995-09-13 | 2004-07-28 | 出光石油化学株式会社 | Mold for manufacturing partially thick molded article and manufacturing method |
| US5716560A (en) * | 1995-09-14 | 1998-02-10 | Icp Systems, Inc. | Gas assisted injection molding combining internal and external gas pressures |
-
2005
- 2005-11-30 JP JP2005345555A patent/JP4650239B2/en not_active Expired - Fee Related
-
2006
- 2006-11-30 CN CN2006101611224A patent/CN1974175B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102712119A (en) * | 2010-01-13 | 2012-10-03 | 佳能株式会社 | Resin-molded component and resin-molding mold |
| CN102712119B (en) * | 2010-01-13 | 2015-05-20 | 佳能株式会社 | Resin-molded component and resin-molding mold |
| US9533439B2 (en) | 2010-01-13 | 2017-01-03 | Canon Kabushiki Kaisha | Resin-molded component and resin-molding mold |
| CN111469933A (en) * | 2019-01-23 | 2020-07-31 | 丰田自动车株式会社 | Vehicle body structural member |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007144934A (en) | 2007-06-14 |
| CN1974175B (en) | 2011-07-20 |
| JP4650239B2 (en) | 2011-03-16 |
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