CN1322950C - Warm house low pressure casting method for alloy casting and casting machine thereof - Google Patents
Warm house low pressure casting method for alloy casting and casting machine thereof Download PDFInfo
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- CN1322950C CN1322950C CNB2004100511268A CN200410051126A CN1322950C CN 1322950 C CN1322950 C CN 1322950C CN B2004100511268 A CNB2004100511268 A CN B2004100511268A CN 200410051126 A CN200410051126 A CN 200410051126A CN 1322950 C CN1322950 C CN 1322950C
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 39
- 238000001125 extrusion Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 9
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- 238000002347 injection Methods 0.000 claims description 24
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- 239000011230 binding agent Substances 0.000 claims description 21
- 238000000465 moulding Methods 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 9
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- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention relates to a low-pressure casting method for an alloy casting in a warm house, and a casting machine. The method comprises: heating and stirring alloy materials in a sealed crucible to form a liquid alloy material; putting a mould cavity, a runner and a swaging cavity in a vacuum state; feeding the liquid alloy material in definite quantity to the swaging cavity by a screw material feeding device; then pressing the liquid alloy material in the swaging cavity into the mould cavity to be molded by a piston-type extrusion device. The casting machine comprises a crucible assembly device, an inclined screw feeder, a piston-type extrusion device, and a mould holder. The present invention adopts a full sealed vacuum low-pressure casting process with the machine and the mould in one body and with screw feeding. Because of the vacuum state of the swaging cavity, when the material is pressed to the swaging cavity, extrusion pressure is small without a big oil cylinder; therefore, energy is saved, and alloy castings with air bubbles and burrs are decreased a lot. Through experiments, the present invention can decrease the defective fraction of a product to less than 5 percent, and the minimum wall thickness of the alloy casting can be less than 0.8mm.
Description
Technical field
The present invention relates to the low pressure casting technology, specifically is a kind of greenhouse low-pressure casting method and non-flat line injection alloy greenhouse air injection machine of alloy-steel casting.
Background technology
At present, the low-pressure casting process of low-melting alloy adopts following steps more: feed Compressed Gas in the sealing crucible of alloy liquid is housed, the pressure of gas acts on the alloy surface of the cast temperature that keeps certain, under lower mold filling pressure, alloy along the stalk that communicates with casting mold through runner, casting mold cast gate, reposefully be full of die cavity after, increase pressure, make the alloy liquid solidification and crystallization under higher pressure in the die cavity; Gas release in the crucible then, the liquid metal of ot-yet-hardened falls back in the crucible under the effect of gravity in the pipe that boosts; Carry out next circulation after taking out foundry goods.
For the casting of Mg alloy castings, because very easily oxidation of magnesium alloy, burning, liquid magnesium alloy falls the oxidation that causes after rise when adopting above-mentioned cast release in the pipe that boosts, carry out repeatedly, produce a large amount of oxide skin at the Guan Zhonghui that boosts, influence production efficiency, also may cause the oxide inclusion of foundry goods.
Conventional cast equipment has four kinds of thixotropings, rheology injector of cold-chamber die casting machine, hot chamber machine and fritting etc., its weak point is respectively arranged in shape casting, alloy-steel casting is in forming process, many places are in non-sealed state, make cast member contain bubble and more burr, yield rate reduces, and the casting cost is increased.Cold house, thermal die casting machine are when moulding, and being difficult for mould and equipment itself is combined into one vacuumizes, and raw material contacts with air in forming process, easily forms the oxidation of finished product own and wraps wind phenomenon, burr phenomenon.It is approaching with injection molding machine of plastic in theory for the thixotroping of fritting, rheology injector, become feed particulate material directly to send into screw rod in magnesium alloy and add thermal agitation, heating whipping process by expecting firmly in the soft material, easily make screw rod produce wearing and tearing because of hard material, service life of a machine is shortened, the easy oxidation of magnesium alloy need add inert gas (as argon gas) in wherein when soft material, and causing raw material to mix with argon gas easily to form finished product bag wind has bubble and burr, causes finished product fraction defective height.
Summary of the invention
The objective of the invention is to avoid existing alloy casting technique, equipment above shortcomings, a kind of greenhouse low-pressure casting method of alloy-steel casting is provided, and the non-flat line injection alloy greenhouse air injection machine of this casting method of realization, to improve the quality and the yield rate of alloy-steel casting, satisfy the demand of foundry industry.
The greenhouse low-pressure casting method of alloy-steel casting of the present invention comprises the steps:
A, make alloy raw material heating in the crucible of sealing, stir, form the fluidised form alloy material;
The charging valve at b, occlusion pressure casting mould charging aperture place, mold cavity, running channel and binder chamber are vacuumized, closing molding die cavity material stopping valve is opened described charging valve, by vertical heat tracing spiral propeller to the described fluidised form alloy material of binder chamber weight feed;
C, close described charging valve again, open the mold cavity material stopping valve, the fluidised form alloy material in the binder chamber is pressed into moulding in the die cavity of mould by the piston squeeze cylinder.
The non-flat line injection alloy greenhouse air injection machine of realizing above-mentioned casting method comprises:
One crucible composite set contains crucible 1, heating and heat-insulating device 1 ' and electric blender structure 2, and crucible 1 is arranged in the heating and heat-insulating device 1 ';
One screw rod feeding device 9, it is inclined in the outside of crucible composite set, peripheral hardware heat tracing layer, the tapering of its front end part can cooperate with the positioning sleeve in mould gate overlaps the passage of a side, sets the material controlling organization between screw rod feeding device 9 charging apertures and the crucible; And,
One piston-type extrusion materials device 12 is arranged on the frame 16 by material extrusion cylinder seat 15 movably, and wherein piston bush 11 outsides are provided with heat tracing layer 10.
The present invention adopts machine-mould integrated full driving fit vacuum low-pressure casting technique, make mold cavity, running channel and binder chamber be in vacuum state, by tilting screw rod feeding device to binder chamber weight feed fluidised form alloy material, fluidised form alloy material in the binder chamber is pressed into moulding in the die cavity of mould by the piston-type extrusion materials device then, when the piston pressurizing unit advanced to the die cavity binder, because of die cavity is in vacuum state, squeeze pressure was little, do not need large tank, save the energy; Simultaneously, it is a lot of that the alloy-steel casting that contains bubble and burr is reduced, and fraction defective reduces.
The magnesium alloy material is obtained evenly and the raw material of desirable characteristics composition through the airtight heating of crucible composite set, stir process, needn't buy the required expensive special material of common goods, and manufacturing cost is reduced greatly.
The non-parallel setting of axis of the screw rod feeding device of casting machine of the present invention and piston-type extrusion materials device, both axis normal of exemplary embodiments, this set has made things convenient for the combination with mould, can simplify the structure of complete machine, handled easily.
Tradition is touched, the product fraction defective of rheology injection injection machine is minimum, and its fraction defective is 20 to 30 percent usually.The product fraction defective can be reduced to below 5 percent through test present device, technology, the minimum wall thickness (MINI W.) of alloy-steel casting can be less than 0.8mm.
Description of drawings
Fig. 1 is the non-flat line injection of a present invention alloy greenhouse air injection machine example structure schematic diagram;
Fig. 2 is the schematic diagram of Fig. 1 casting machine and die assembly.
The specific embodiment
Below in conjunction with the embodiment accompanying drawing the present invention is described in detail.
With reference to Fig. 1, non-flat line injection alloy greenhouse air injection machine mainly comprises: crucible composite set, screw rod feeding device, piston-type extrusion materials device and the mould rack that casting pressing mold tool is installed.
The crucible composite set contains crucible 1, heating and heat-insulating device 1 ' and electric blender structure 2, crucible 1 is arranged in the heating and heat-insulating device 1 ', crucible 1 is provided with feeding mouth 3 and safety head 3 ', crucible 1 has material-clearing device 7 and slag-draining device 8, crucible 1 be provided with vacuumize take over 4 and inert gas charge into and take over 5, inert gas charges into to be taken over 5 and can receive gas bomb 5 ' by air inlet pipe, by-pass valve control.Electric blender structure 2 is made up of the rotation mixing part, running part and the CD-ROM drive motor that are in the crucible.When the casting of aluminium or magnesium alloy, material is obtained evenly and the raw material of desirable characteristics composition through the heating of this crucible composite set, stir process, needn't buy the required expensive special material of common goods, and manufacturing cost is reduced greatly.
Screw rod feeding device 9 is erect the outside that is arranged at the crucible composite set, peripheral hardware heat tracing layer, the tapering of its front end part can cooperate with the positioning sleeve in mould gate overlaps the passage of a side, set the material controlling organization between screw rod feeding device 9 charging apertures and the crucible, this blanking controlling organization contains the conveying pipeline 6 that is connected between screw rod feeding device charging aperture and the crucible, the upper port of this conveying pipeline 6 is provided with control valve 6 ', and this control valve 6 ' can be pneumatic type, electrodynamic type etc.The angle of the axis of the axis of screw rod feeding device and piston-type extrusion materials device is 90 degree among Fig. 1, both axis are not parallel in the practical application gets final product, usually the angle of both axis can be the 15-90 degree, and the angle of both axis can be 90 degree, 60 degree, 45 degree, 30 degree or the like in the typical application.
Piston-type extrusion materials device 12 is arranged on the frame 16 by material extrusion cylinder seat 15, and wherein piston bush 11 outsides are provided with heat tracing layer 10.Between mould rack 18 and material extrusion cylinder seat 15, install and can promote another oil cylinder 17 that material extrusion cylinder seat 15 moves, this oil cylinder 17 can before and after regulate material extrusion cylinder seat 15, conveniently expect clearly, adjustment and mould adaptation.
As shown in Figure 2, sprue bush 20 joint portions at screw rod feeding device discharging opening and mould 22 are provided with charging valve 21, this charging valve 21 can be arranged at sprue bush 20 1 sides of mould in the typical case, sprue bush one side of mould is provided with the passage of ccontaining screw rod feeding device front end, this channel bottom is installed the positioning sleeve 25 that is used for cooperating the screw rod feeding device, charging valve 21 is positioned at the charging aperture place of mould gate cover 20, in this charging valve 21 air flue is arranged, the effect that has backgauge and vacuumize, die cavity material stopping valve 24 is set on the running channel of mould 22, and wherein 23 is die cavity.Charging valve 21 and die cavity material stopping valve 24 can adopt traditional, pneumatic device or electric device to drive.
During use, assembling die 22 is installed on the mould rack 18, makes positioning sleeve 25 driving fits of screw rod feeding device 9 and channel bottom in the above-mentioned passage that inserts mould, make charging valve 21 be positioned at the sprue bush joint portion of screw rod feeding device discharging opening and mould.Mobile material extrusion cylinder seat 15 is adjusted piston-type extrusion materials device 12 and mould 22 adaptations, between sprue bush 20 end faces of piston bush inner carrier 13 end faces of piston-type extrusion materials device 12 and mould, form binder chamber 14 like this, these piston bush 11 outsides are provided with heat tracing layer 10, can keep the temperature of the fluidised form alloy material in the binder chamber.
Below in conjunction with Fig. 2 this foundry technology process is described:
Embodiment 1: the compacting aluminium alloy castings, alloy raw material needn't be purchased the high alloy pig of valency, this machine can inject raw material respectively the crucible fusion and stir, as adopt aluminium alloy stock ADC12, each components contents is in the raw material: aluminium 80.5-85%, copper 1.5-3.5%, silicon 9.6-1 2%, magnesium below 0.3%, zinc below 1%, iron below 1.3%, manganese below 0.5%, sodium below 0.5%, arsenic are below 0.3%, melting temperature is about 630 ℃, the insulation forming temperature is about 420 ℃, and squeeze pressure is 320kgf/cm
2
The casting process of aluminium alloy castings is as follows:
A, above-mentioned aluminium alloy stock is packed in the crucible 1, heating in crucible, stir, form the fluidised form alloy material.
The charging valve 21 of the band air flue at b, closing molding charging aperture place vacuumizes mold cavity 23, running channel and binder chamber 14; Closing molding die cavity material stopping valve 24, open described charging valve 21, to the described fluidised form alloy material of piston bush binder chamber 14 weight feeds that is positioned at the piston-type extrusion materials device, the holding temperature of described fluidised form alloy material in heat tracing screw rod 9 and binder chamber 14 is about 420 ℃ by tilting heat tracing screw rod feeding device 9.
C, close described charging valve 21 again, open mold cavity material stopping valve 24, the fluidised form alloy materials in the binder chamber 14 are pressed into moulding in the die cavity 23 of mould 22 by piston-type extrusion materials device 12.
When piston extrusion device advanced to the die cavity binder, because of die cavity is in vacuum state, squeeze pressure is little, and (and traditional cold house, hot cell squeeze pressure were 560kgf/cm
2), squeeze cylinder does not need large tank, saves the energy.
Embodiment 2: the compacting Mg alloy castings, alloy raw material is more expensive when having specific characteristics material, this machine can be with raw material and special material (as beryllium, rare earth material or the like) injects the crucible fusion respectively, stir, as adopt raw material magnesium alloy AZ91D, each components contents is in this raw material: magnesium 89.5-90.5%, aluminium 8.5-9.5%, zinc 0.45-0.9%, manganese 0.17-0.4%, silicon is below 0.05%, copper is below 0.025%, sodium is below 0.001%, iron reaches other trace element below 0.004%, its melting temperature is 590 ℃, the insulation forming temperature is 350 ℃, and squeeze pressure is 250kgf/cm
2
The casting process of Mg alloy castings is as follows:
A, above-mentioned raw material magnesium alloy is packed in the crucible 1, after vacuumizing, charge into from inert gas and to take over 5 and charge into inert gas,, heating in crucible, stir, form the fluidised form alloy material as argon gas etc.; Filling with inert gas can be avoided the oxidation of magnesium alloy material in crucible.
The charging valve 21 of the band air flue at b, closing molding charging aperture place vacuumizes mold cavity 23, running channel and binder chamber 14; Closing molding die cavity material stopping valve 24 is opened described charging valve 21, by heat tracing screw rod feeding device 9 to the described fluidised form alloy material of piston bush binder chamber 14 weight feeds that is positioned at the piston-type extrusion materials device;
C, close described charging valve 21 again, open mold cavity material stopping valve 24, the fluidised form alloy materials in the binder chamber 14 are pressed into moulding in the die cavity 23 of mould 22 by piston-type extrusion materials device 12.
During the above-mentioned Mg alloy castings of moulding, its squeeze pressure only is 250kgf/cm
2, and traditional cold house, hot cell squeeze pressure are 510kgf/cm
2, the thixotroping of fritting, rheoforging squeeze pressure are bigger.
The full driving fit vacuum low-pressure of machine mould one of the present invention casting technique, be suitable for the casting of magnesium, aluminium, Zinc alloy casting etc., through test, adopt the present invention the fraction defective of alloy cast product can be reduced to below 5 percent, the minimum wall thickness (MINI W.) of alloy-steel casting can be less than 0.8mm.
Claims (10)
1, a kind of alloy-steel casting greenhouse low-pressure casting method is characterized in that comprising the steps:
A, make alloy raw material heating in the crucible of sealing, stir, form the fluidised form alloy material;
The charging valve at b, closing molding charging aperture place vacuumizes mold cavity, running channel and binder chamber; Closing molding die cavity material stopping valve is opened described charging valve, by tilting heat tracing screw rod feeding device to the described fluidised form alloy material of described binder chamber weight feed;
C, close described charging valve again, open the mold cavity material stopping valve, the fluidised form alloy material in the described binder chamber is pressed into moulding in the die cavity of mould by the piston-type extrusion materials device.
2, according to the alloy-steel casting greenhouse low-pressure casting method of claim 1, it is characterized in that: described binder chamber is in the piston bush of piston-type extrusion materials device, between the sprue bush end face of piston end surface and mould, and this piston bush outside is provided with the heat tracing layer.
3, according to the alloy-steel casting greenhouse low-pressure casting method of claim 1, it is characterized in that: described screw rod feeding device peripheral hardware heat tracing layer, front end has tapering, sprue bush one side of mould is provided with the passage of ccontaining screw rod feeding device front end, this channel bottom is installed the positioning sleeve that is used for cooperating the screw rod feeding device, and the charging valve is arranged at the sprue bush joint portion of screw rod feeding device discharging opening and mould.
4, according to the alloy-steel casting greenhouse low-pressure casting method of claim 1, it is characterized in that: in crucible, be filled with the inert gas of avoiding the oxidation of fluidised form alloy material.
5, a kind of non-flat line injection alloy greenhouse air injection machine is characterized in that comprising:
One crucible composite set contains crucible (1), heating and heat-insulating device (1 ') and electric blender structure (2), and crucible (1) is arranged in the heating and heat-insulating device (1 ');
One screw rod feeding device (9), be inclined in the outside of crucible composite set, peripheral hardware heat tracing layer, the tapering of its front end part can cooperate with the positioning sleeve in mould gate overlaps the passage of a side, sets the material controlling organization between screw rod feeding device (9) charging aperture and the crucible; And,
One piston-type extrusion materials device (12) is arranged on the frame (16) by material extrusion cylinder seat (15) movably, and wherein piston bush (11) outside is provided with heat tracing layer (10).
6, according to the non-flat line injection alloy greenhouse air injection machine of claim 5, it is characterized in that: the charging valve (21) that the band air flue is set in the sprue bush joint portion of screw rod feeding device (9) discharging opening and mould.
7, according to the non-flat line injection alloy greenhouse air injection machine of claim 5, it is characterized in that: mould rack (18) is set on frame (16), this mould rack (18) is positioned at piston bush (11) the head place of piston-type extrusion materials device (12), and some mould alignment pins (19) are established in mould rack (18) outside.
8, according to the non-flat line injection alloy greenhouse air injection machine of claim 5, it is characterized in that: the angle of the axis of the axis of described screw rod feeding device (9) and piston-type extrusion materials device (12) is the 15-90 degree.
9, according to the non-flat line injection alloy greenhouse air injection machine of claim 5, it is characterized in that: described crucible (1) is provided with and vacuumizes adapter (4) and noble gas gas charges into adapter (5).
10, according to the non-flat line injection alloy greenhouse air injection machine of claim 5, it is characterized in that: install between described mould rack (18) and the material extrusion cylinder seat (15) and can promote another oil cylinder (17) that material extrusion cylinder seat (15) moves, be used for expecting clearly, the adaptation of adjustment and mould.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100511268A CN1322950C (en) | 2004-08-11 | 2004-08-11 | Warm house low pressure casting method for alloy casting and casting machine thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100511268A CN1322950C (en) | 2004-08-11 | 2004-08-11 | Warm house low pressure casting method for alloy casting and casting machine thereof |
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| Publication Number | Publication Date |
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| CN1733392A CN1733392A (en) | 2006-02-15 |
| CN1322950C true CN1322950C (en) | 2007-06-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102451898A (en) * | 2010-10-30 | 2012-05-16 | 比亚迪股份有限公司 | Vacuum melting die-casting equipment |
| CN102652994A (en) * | 2012-04-26 | 2012-09-05 | 太仓市弧螺机电有限公司 | Pouring device |
| CN102728810A (en) * | 2012-04-26 | 2012-10-17 | 太仓市弧螺机电有限公司 | Metal conveyance pouring device |
| CN102974800B (en) * | 2012-10-17 | 2014-10-29 | 南昌大学 | Injecting feeding device of extrusion casting machine |
| CN113695549A (en) * | 2021-08-24 | 2021-11-26 | 张英华 | Method for manufacturing pressure casting product with alloy lining or inner container |
| CN115301918A (en) * | 2022-07-27 | 2022-11-08 | 刘小梅 | Die casting die of precision die casting |
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| CN1100979A (en) * | 1993-10-01 | 1995-04-05 | 欧阳明 | Vacuum die casting machine |
| CN1229015A (en) * | 1998-02-19 | 1999-09-22 | 方达雷克斯公司 | Method for venting diecasting mould and apparatus for performing the method |
| CN1270863A (en) * | 1999-04-20 | 2000-10-25 | 里特铝吉伯里有限公司 | Pressure casting process and its device |
| CN1301608A (en) * | 1999-12-28 | 2001-07-04 | 日精树脂工业株式会社 | Low melting point metal material injection molding machine |
| WO2004018130A1 (en) * | 2002-07-23 | 2004-03-04 | Sodick Plustech Co., Ltd. | Injection device of light metal injection molding machine |
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2004
- 2004-08-11 CN CNB2004100511268A patent/CN1322950C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1100979A (en) * | 1993-10-01 | 1995-04-05 | 欧阳明 | Vacuum die casting machine |
| CN1229015A (en) * | 1998-02-19 | 1999-09-22 | 方达雷克斯公司 | Method for venting diecasting mould and apparatus for performing the method |
| CN1270863A (en) * | 1999-04-20 | 2000-10-25 | 里特铝吉伯里有限公司 | Pressure casting process and its device |
| CN1301608A (en) * | 1999-12-28 | 2001-07-04 | 日精树脂工业株式会社 | Low melting point metal material injection molding machine |
| WO2004018130A1 (en) * | 2002-07-23 | 2004-03-04 | Sodick Plustech Co., Ltd. | Injection device of light metal injection molding machine |
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| CN1733392A (en) | 2006-02-15 |
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