JP2008120038A - Injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding machine constituted compactly and can be made inexpensively. <P>SOLUTION: An air cylinder 15 is provided for the purpose of clamping and opening an upper mold 30X and a lower mold 30Y, and a hydraulic cylinder 50 driven by operation air through a booster 60 is arranged between the lower mold 30Y and a lower die plate 31Y. A movable receiving member 40 is reciprocally driven between a receiving position R1 and a receipt releasing position R2 by a forward-facing cylinder 45. After the upper and lower molds 30X and 30Y are clamped (I), the movable receiving member 40 is driven to the receiving position R1 (II) and the hydraulic cylinder 50 is driven (III). The upper and lower molds 30X and 30Y are clamped under high pressure while upper and lower die plates 31X and 31Y are held and received by the upper frame 23 of a C-frame 20 and the receiving surface 41 of the movable receiving member 40 to hold the high pressure. By this constitution, the molten resin injected and supplied in a cavity is compressed to be molded into a resin molded product. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an injection molding machine.

A driving source for a molding die in an injection molding machine is required to have a stroke for obtaining a corresponding mold opening amount and to maintain a clamping pressure, and a hydraulic cylinder is generally used to satisfy both of them. However, when a hydraulic cylinder is used, ancillary equipment such as an oil tank and a valve mechanism becomes large, and there is a concern that a large installation clearance is required.
Therefore, as a countermeasure, a die drive mechanism using a servomotor and a screw rod has been proposed as described in Patent Document 1.
Japanese Patent Laid-Open No. 2004-50521

The mold drive mechanism using the servo motor and the screw rod can certainly contribute to space saving, but has a problem in cost, and the appearance of a new device has been eagerly desired.
The present invention has been completed based on the above circumstances, and an object of the present invention is to provide an injection molding machine that is compact and can be handled at low cost.

  As a means for achieving the above object, an injection molding machine according to the invention of claim 1 includes a first and second molding dies arranged so as to be capable of contacting and separating, and a first molding dies. A die plate disposed on a surface opposite to the side facing the second molding die, and disposed between the die plate and the first molding die, via an air-hydraulic converter. A hydraulic cylinder that can be driven using air as a drive source, the first molding die including up to the die plate, an air cylinder that moves the second molding die in the contact / separation direction, and the both molding dies In the state where the mold is clamped, the fixed receiving portion facing either one of the die plate and the second molding mold of the first molding mold, and clamping the mold facing the other. A receiving position where both the molds can be clamped between the fixed receiving part and the front A movable receiving portion that is moved between a receiving release position in which the opposed state to the fixed receiving portion is released, and clamping and opening of the molding dies are performed by driving the air cylinder, The mold clamping pressure is held by driving the hydraulic cylinder.

  According to a second aspect of the present invention, in the first aspect, the first and second molding dies are arranged to face each other in the vertical direction, and one end of the horizontal upper and lower frames is connected to the vertical connection portion. The frame is connected to the C frame, and one of the upper and lower frames of the C frame serves as the fixed receiving portion, and the die plate of the first molding die and the second molding die are either One of them is fixed, and the air cylinder is provided vertically between the other of the die plate and the second molding die of the first molding die and a horizontal base, and The movable receiving portion is provided so as to be able to advance and retreat on the outer surface side of the die plate or the second molding die of the first molding die on the side connected to the air cylinder in a clamped state. It has the characteristics.

  According to a third aspect of the present invention, in the second aspect, the second molding die is disposed on the upper side, the first molding die is disposed on the lower side, and the second molding die is The die frame of the first molding die is connected to the air cylinder while being fixed to the upper frame serving as the fixed receiving portion in the C frame, and the movable receiving portion is connected to the C frame. It is characterized in that it is provided so as to be able to advance and retreat on the lower surface side of the die plate in the mold-clamping state by another lateral air cylinder provided.

  According to a fourth aspect of the invention, there is provided the receiving surface according to the third aspect, wherein the movable receiving portion is movable with the lower frame of the C frame as a guide, and the upper surface thereof receives the lower surface of the die plate. And the die plate is formed with an insertion hole through which the movable receiving portion is inserted so as to be movable up and down, and the movable receiving portion is spaced from the insertion hole in the lower surface of the die plate. It is characterized in that it is driven back and forth between a receiving position corresponding to the location and a receiving release position corresponding to the insertion hole.

According to a fifth aspect of the present invention, the pair of lateral air cylinders according to the third aspect are provided in a posture facing each other, and the extending ends of the lateral air cylinders are respectively connected to each other in the die plate. It is characterized in that a movable receiving portion capable of receiving the lower surface of the opposite edge is provided.
According to a sixth aspect of the present invention, in the first aspect of the present invention, the movable receiving portion is formed in a substantially portal shape that allows the vertical air cylinder to be fitted and released from the radial direction. Has characteristics.

  The invention according to claim 7 is the one according to claim 2, wherein the second molding die is disposed on the upper side, the first molding die is disposed on the lower side, and the second molding die is The die plate is fixed to the upper frame serving as the fixed receiving portion of the C frame, and the die plate of the first molding die is connected to the air cylinder. When the receiving portion is pivotally supported so that the die plate is lifted to clamp the mold, the movable receiving portion takes a drooping posture by its own weight so that it is not in contact with the lower frame of the C frame. A tension releasing means that releases the die plate and allows the die plate to descend by pressing the movable receiving portion in a suspended position and swinging and displacing it laterally. But Having the features in place that has been kicked.

<Invention of Claim 1>
Both molds are clamped by driving the air cylinder in one direction from the mold open state, and then the movable receiving part advances from the receiving release position to the receiving position, so that both receiving parts are The die plate of the molding die and the second molding die can be clamped. Next, when the hydraulic cylinder is driven, the die plate and the second molding die are received by the corresponding receiving portions, and both the molding dies are clamped at a high pressure and the same pressure is maintained. A resin molded product is molded.
When taking out the resin molded product, after the drive of the hydraulic cylinder is released, the movable receiving portion retreats to the receiving release position, and then the mold is opened by driving the air cylinder in the other direction.

That is, in the present invention, mold clamping and mold opening are performed with an air cylinder that easily obtains a large stroke, and the mold clamping pressure is maintained with a hydraulic cylinder that easily obtains a high pressure. Here, the hydraulic cylinder is driven using air as a drive source via an air-hydraulic converter, and the hydraulic oil itself only needs to travel from the air-hydraulic converter to a part of the hydraulic cylinder. Therefore, the incidental facilities are simplified as compared with the case of driving the hydraulic cylinder alone. In addition, the use of an air cylinder and a hydraulic cylinder can be made cheaper than, for example, a case where a servo motor and a screw rod are used.
As a result, the entire apparatus can be made compact and space can be saved, and it can be manufactured at low cost.

<Invention of Claim 2>
It can be effectively applied to a vertical injection molding machine in which a pair of molding dies are opposed to each other in the vertical direction, and the reaction force when the high-pressure mold is clamped is a fixed receiving portion consisting of either the upper or lower frame of the C frame. The frame is received by a movable receiving portion provided so as to be movable back and forth in the horizontal direction at a position facing the frame in the vertical direction.
Since the fixed receiving portion for receiving the high pressure is provided by using a C frame which is conventionally used in this type of vertical injection molding machine, it can be provided at low cost.

<Invention of Claim 3>
When the air cylinder is extended and driven from the mold open state, both molding dies are clamped, and then the movable receiving portion is advanced by another air cylinder so that the both receiving portions are connected to the second molding die. The die plate of the first molding die can be clamped from above and below. Next, when the hydraulic cylinder is driven, while the second molding die and the die plate are received by the corresponding receiving portions, both the molding dies are clamped at a high pressure and the same pressure is maintained. A resin molded product is molded. When the resin molded product is taken out, after the drive of the hydraulic cylinder is released, the movable receiving portion is retracted, and then the mold is opened by the contraction drive of the air cylinder.

<Invention of Claim 4>
The mold is clamped in a state where the movable receiving portion is in the receiving release position corresponding to the insertion hole of the die plate, and when the mold is clamped, the movable receiving portion moves to the receiving position along the lower frame of the C frame, and the fixed receiving portion. The second molding die and the die plate of the first molding die can be clamped from above and below. After molding, the movable receiving portion is moved to the receiving release position and then opened.

<Invention of Claim 5>
The molds are clamped in a state of being retracted so that the two movable receiving parts are separated from each other, and when the molds are clamped, the lateral air cylinders are extended and driven so that the two movable receiving parts are advanced toward each other, It moves to the lower surface side of the opposite edge of the die plate, and the second molding die and the die plate of the first molding die can be clamped from above and below between the fixed receiving portions. After molding, the molds are opened after both movable receiving parts are retracted.
<Invention of Claim 6>
Since the movable receiving portion is formed in a substantially gate shape, the receiving position can be set to a position where the vertical air cylinder escapes into the movable receiving portion and advances to the center of the lower surface of the die plate. it can. When receiving the reaction force of the high-pressure mold clamping with the fixed receiving portion, it can be received more stably.

<Invention of Claim 7>
When both molds are clamped by extending the air cylinder from the mold open state, the movable receiving portion provided on the die plate takes a drooping posture by its own weight, and the lower frame of the C frame It will be possible to stretch between. Next, when the hydraulic cylinder is driven, the second molding die and the die plate are movable receiving portions that are in a state of being stretched between the upper fixed receiving portion and the lower frame of the C frame. While being received, both molding dies are clamped at a high pressure and the same pressure is maintained, and a resin molded product is molded during this time. When the resin molded product is taken out, the movable receiving portion is oscillated and displaced by the tension release means and is released to the side of the lower frame of the C frame, and then the mold is opened by the contraction drive of the air cylinder. The

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, a vertical injection molding machine of an injection compression molding type is illustrated.
1 and 2, reference numeral 20 denotes a C frame, which is fixedly provided on a base 10 of a main body frame installed on a predetermined installation surface. The C frame 20 is assembled integrally by a pair of left and right side plates 21 having a substantially C-shaped side surface being arranged at a predetermined interval and passing a plurality of bolts 22 between the side plates 21 and fastening them. As a whole, the shape is such that the ends of the horizontal upper and lower frames 23 and 24 are connected by a vertically connecting portion 25.

The C frame 20 is provided with a pair of upper and lower molding dies 30X and 30Y (hereinafter simply referred to as an upper die 30X and a lower die 30Y). Here, the upper die 30X corresponds to the second molding die of the present invention, and the lower die 30Y corresponds to the first molding die of the present invention.
For example, a molding recess is formed on the upper surface of the lower mold 30Y, and molding protrusions are formed on the lower surface of the upper mold 30X so as to fit in the molding recess with a predetermined clearance. A cavity having a predetermined shape is formed by the clearance between the molding protrusion and the molding recess when the mold is clamped. Further, an insertion passage 34 of a nozzle 33 for supplying molten resin is formed at the center of the upper mold 30X, and the tip of the nozzle 33 faces the opening on the lower surface.

The upper die 30X is attached to the center of the lower surface of the upper die plate 31X, and the left and right edges of the upper die plate 31X are fixed to the lower surface of the upper frame 23. The upper frame 23 corresponds to the fixed receiving portion of the present invention.
A resin supply head 38 is provided on the upper surface side of the upper die plate 31X. The resin supply head 38 supplies molten resin generated by, for example, a screw type resin injection machine 39 to the nozzle 33 described above. In this embodiment, the molten resin is injected at a low pressure toward the molding recess of the lower mold 30Y facing the nozzle 33.

The lower die 30Y is attached to the upper surface side of the lower die plate 31Y with a hydraulic cylinder 50 described later interposed therebetween. Although not shown, a vertical tie bar is provided between the upper and lower die plates 31X and 31Y. An air cylinder 15 is provided upward on the base 10, and the tip of the piston rod 16 of the air cylinder 15 is connected to the central portion of the lower surface of the lower die plate 31Y.
When the piston rod 16 of the upward air cylinder 15 is extended, as shown in FIG. 2, the lower die 30Y rises along the tie bar with the upper die plate 31X and the hydraulic cylinder 50, that is, approaches the upper die 30X. When the mold is clamped and the piston rod 16 contracts, the lower mold 30Y is lowered and separated from the upper mold 30X, that is, the mold is opened.

  Four hydraulic cylinders 50 are installed, and as shown in FIG. 4, a piston 53 formed at a substantially central portion in the longitudinal direction of the rod 52 is tightly and freely slidable in a short cylinder body 51. The ring 54 is screwed at a position slightly below the upper end of the upper rod 52X. A hydraulic connection port 56 is opened in the lower surface chamber 55 </ b> Y of the piston 53, and a return spring 57 is mounted in the upper surface chamber 55 </ b> X, and the rod 52 is always urged downward by the elasticity of the return spring 57. The ring 54 is stopped by contacting the rod cover 58X. At this time, the lower end of the lower rod 52Y projects downward from the head cover 58Y.

  On the other hand, the hydraulic connection port 56 of each hydraulic cylinder 50 is connected to the output side of a common air-hydraulic converter 60 (hereinafter referred to as a booster 60) by a high-pressure hose 61. The booster 60 simply converts the air pressure as a driving source into a high hydraulic pressure several times to several tens of times. In FIG. 4, when the working air is supplied to the first port P1, the ram 62 advances. When high hydraulic pressure is generated and acts on the lower surface chamber 55Y of the hydraulic cylinder 50, the rod 52 moves up with high thrust, and when operating air is supplied to the second port P2, the ram 62 moves backward to release the hydraulic pressure and return. The rod 52 is returned downward by the elasticity of the spring 57.

  Such hydraulic cylinders 50 are respectively disposed at the four corners of the upper surface of the lower die plate 31Y. Specifically, the hydraulic cylinders 50 are placed on the upper surface of the lower die plate 31Y while fitting the lower projecting ends of the lower rod 52Y into the escape holes 36. The four corners of the lower surface of 58Y are fixed with screws. On the other hand, the screw portion 59 above the ring 54 in the upper rod 52X is fixed by being screwed into a screw hole formed in the base portion 30Ya of the lower die 30Y, that is, the ring 54 fixed to each upper rod 52X is lower die. The upper protruding end of the upper rod 52X is integrally coupled to the lower mold 30Y while receiving the four corners of 30Y.

The C frame 20 is equipped with a pair of left and right movable receivers 40 that function to receive the reaction force during injection compression together with the upper frame 23. As shown in FIGS. 2 and 5, the movable receiver 40 is formed in a vertically long block shape in which the lower side is wider than the upper side, and the horizontal upper end surface is a receiving surface 41. A fitting groove 42 that is slidably fitted into the lower frame 24 of the C frame 20 is formed on the lower end surface. The left and right movable receiving bodies 40 are integrally connected by passing a horizontal connecting member 43 to the opposing surface.
Guide recesses 48 are formed in the left and right corners of the lower die plate 31Y so as to fit the upper end of the movable receiver 40 into a prismatic shape. Two side surfaces of the inner side and the rear side are in contact with the corresponding corners of the guide recess 48 so as to be slidable.

A horizontal mounting plate 44 is passed between the side plates 21 at a position corresponding to the lower side of the connecting portion 25 in the C frame 20, and a movable receiver is located at the center in the width direction on the mounting plate 44. 40 other air cylinders 45 for driving are installed in a horizontal posture facing forward. A bifurcated head 47 for escaping the piston rod 16 of the upward air cylinder 15 is provided at the tip of the piston rod 46 of the forward air cylinder 45, and this head 47 is connected to the connecting member 43 of both the movable receivers 40 described above. Is bound to.
When the piston rod 46 of the forward air cylinder 45 is extended, the movable receiver 40 is pushed forward along the lower frame 24 to correspond to the guide recess 48 on the front edge of the lower die plate 31Y ( On the other hand, when the piston rod 46 is contracted, the movable receiver 40 is pulled back to a position corresponding to a position near the center of the depth of the lower die plate 31Y (receiver). Move to position R1). That is, with the expansion and contraction of the piston rod 46 of the forward air cylinder 45, the movable receiver 40 can reciprocate between the receiving release position R2 and the receiving position R1.
When the mold is clamped by the upward air cylinder 15 described above, as shown in FIG. 2, a predetermined clearance S (for example, between the lower die plate 31Y and the receiving surface 41 of the movable receiving body 40). (About 4 mm) is formed.

Then, the effect | action of this embodiment is demonstrated.
Initially, as shown by the solid line in FIG. 1, the piston rod 46 of the forward air cylinder 45 extends to retract the movable receiver 40 to the receiving release position R <b> 2 and the piston rod 16 of the upward air cylinder 15. Shrinks and is in the mold open state. In this mold open state, as shown in FIG. 5, the base side of the upper end portion of the movable receiving body 40 is in contact with the corner portion of the guide recess 48 of the lower die plate 31 </ b> Y.
When the piston rod 16 of the upward air cylinder 15 extends from this mold open state, the lower die plate 31Y and the hydraulic cylinder 50 both raise the lower mold 30Y (arrow I in FIG. 1), as shown in FIG. Clamped to At this time, the movable receiver 40 functions as a guide when the lower die plate 31Y moves up. Further, by clamping the mold, a clearance S is secured between the lower die plate 31Y and the receiving surface 41 of the movable receiving body 40.

  Subsequently, when the piston rod 46 of the forward air cylinder 45 contracts, the movable receiver 40 moves to the chain line in FIG. 1 and the receiving position R1 shown in FIG. 6, as indicated by the arrow II in FIG. From this state, when the piston rod 16 of the upward air cylinder 15 contracts by a predetermined amount (S), the lower die 30Y side is lowered, and the left and right side edges of the lower die plate 31Y are the receiving surfaces 41 of the left and right movable receivers 40. (See FIG. 3). At the same time, as indicated by the chain line in the figure, a gap is opened between the upper mold 30X and the lower mold 30Y by the same dimension (S), and in this state, a predetermined amount of molten resin is transferred from the nozzle 33 to the lower mold 30Y. Low pressure injection into the molding recess.

Then, the hydraulic cylinders 50 are driven all at once and the rod moves up with high thrust, and the lower die 30Y is pushed up as shown by the arrow III in FIG. 1, and as shown by the solid line in FIG. The upper and lower dies 30X and 30Y are clamped with high pressure while the upper and lower die plates 31X and 31Y are sandwiched between the upper frame 23 of the C frame 20 and the movable receiving body 40, and are pressed against the mold 30X. Pressure is maintained.
During this time, the previously supplied molten resin is compressed and travels into the cavity, and is then cooled and solidified to form a resin molded product.

  When the drive of the hydraulic cylinder 50 is released after a predetermined high-pressure mold clamping time has elapsed, the lower mold 30Y is lowered to the original position as shown by the arrow IV in FIG. Next, once the piston rod 16 of the upward air cylinder 15 is extended by a predetermined amount (S), the lower die 30Y side is lifted into a mold-clamping state (FIG. 2), the lower die plate 31Y, and the movable receiver 40. A clearance S is ensured between the two.

From this state, the piston rod 46 of the forward-facing air cylinder 45 is extended, so that the movable receiver 40 moves to the receiving release position R2 indicated by the solid line in FIG.
Finally, when the piston rod 16 of the upward air cylinder 15 contracts to the original position, the lower die 30Y is lowered, that is, the die is opened, as shown by the arrow VI in FIG. For example, the resin molded product is temporarily held on the upper mold 30X side, and is projected toward a predetermined extraction position by a projecting rod (not shown) provided on the upper mold 30X side.
Thereafter, the above operation is repeated.

As described above, according to the first embodiment, the mold clamping and mold opening are performed by the air cylinder 15 which easily obtains a large stroke, and the mold clamping pressure is maintained by the hydraulic cylinder 50 which easily obtains a high pressure. Here, the hydraulic cylinder 50 is driven by operating air as a driving source via the booster 60, and the hydraulic oil itself needs only to go from the booster 60 to a part of the hydraulic cylinder 50. Ancillary facilities are simplified as compared with the case of driving 50 single units. Further, the use of the air cylinder 15 and the hydraulic cylinder 50 can cope with a lower cost than the case of using a servo motor and a screw rod, for example.
As a result, the entire apparatus can be made compact and space can be saved, and it can be manufactured at low cost.

  Further, the fixed receiving portion that receives the high pressure uses the upper frame 23 of the C frame 20, and uses the lower frame 24 of the C frame 20 as a guide for moving and guiding the movable receiving body 40. Since it is conventionally applied to this type of vertical injection molding machine, it can be handled at low cost.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the arrangement position of the movable receiving portion is changed compared to the first embodiment. The arrangement structure of the upper mold 30X and the lower mold 30Y and the drive structure for opening the mold clamping mold are the same as in the first embodiment.
A pair of short horizontal air cylinders 65 are attached to the outer surface of the portion constituting the lower frame 24 of the side plate 21 of the C frame 20 so as to face each other. Specifically, the mounting position is a position slightly below the position of the lower die plate 31Y when the mold is clamped, and a position corresponding to the middle of the depth of the lower die plate 31Y.

A movable receiving plate 68 capable of receiving the left and right side edges of the lower die plate 31Y is fixed to the tip of the piston rod 66 of each horizontal air cylinder 65, and the air cylinder in the side plate 21 of the C frame 20 is fixed. An insertion hole 69 through which the piston rod 66 and the movable receiving plate 68 can be inserted is opened on the attachment surface 65.
When the piston rod 66 of the sideways air cylinder 65 contracts, the movable receiving plate 68 moves to the position where it is retracted into the insertion hole 69 (receiving release position R2) as shown in FIG. In a state where the rod 66 is extended, as shown in FIG. 9, the movable receiving plate 68 protrudes inward from the insertion hole 69 and moves to a position where it can interfere with the left and right side edges of the lower die plate 31Y (receiving position R1). To do. That is, with the expansion and contraction of the piston rod 66 of the sideways air cylinder 65, the movable receiving plate 68 can reciprocate between the receiving position R1 and the receiving release position R2.

The operation of the second embodiment is as follows.
Initially, as shown by the solid line in FIG. 8, the piston rods 66 of both sideward air cylinders 65 contract and the movable receiving plate 68 is retracted to the receiving release position R2, and the piston rods of the upwardly facing air cylinders 15 are retracted. 16 is in a mold open state due to contraction. When the piston rod 16 of the upward air cylinder 15 extends from this mold open state, the lower mold 30Y rises together with the lower die plate 31Y and the hydraulic cylinder 50 (arrow I in FIG. 8). Clamped as shown. At this time, although not shown, a clearance S is secured between the lower die plate 31Y and the movable receiving plate 68.

Subsequently, when the piston rod 66 of both the air cylinders 65 facing sideways is extended, the movable receiving plate 68 moves to the receiving position R1 as shown by an arrow II in FIG. From this state, when the piston rod 16 of the upward air cylinder 15 contracts by a predetermined amount (S), the lower die 30Y side is lowered, and the left and right side edges of the lower die plate 31Y are received by the left and right movable receiving plates 68 ( (See FIG. 9). At the same time, as indicated by the chain line in the figure, a gap is opened between the upper mold 30X and the lower mold 30Y by the same dimension (S), and in such a state, the molten resin is injected into the molding recess of the lower mold 30Y at a low pressure. The
Then, the hydraulic cylinders 50 are driven all at once, and the rod moves up with high thrust, and the lower die 30Y is pushed up as shown by the arrow III in FIG. 9, and as shown by the solid line in FIG. The upper and lower dies 30X and 30Y are clamped at a high pressure while the upper and lower die plates 31X and 31Y are sandwiched between the upper frame 23 of the C frame 20 and the movable receiving plate 68, and pressed. The pressure is maintained, and a resin molded product is molded during this time.

When the drive of the hydraulic cylinder 50 is released after a predetermined high-pressure clamping time has elapsed, the lower mold 30Y is lowered to the original position as shown by the arrow IV in FIG. 9, and then the piston rod 16 of the upward air cylinder 15 is moved. Is once extended by a predetermined amount (S), the lower die 30Y side is lifted to be in a clamped state, and a clearance S is secured between the lower die plate 31Y and the movable receiving plate 68. From this state, when the piston rods 66 of both the air cylinders 65 facing sideways are contracted, the movable receiving plate 68 moves to the receiving release position R2, as indicated by the arrow V in FIG.
Finally, when the piston rod 16 of the upward air cylinder 15 contracts to the original position, the lower mold 30Y is lowered as shown by the arrow VI in FIG. 8, that is, the mold is opened, and the resin molded product is taken out. Thereafter, the above operation is repeated.

  In the second embodiment, as in the first embodiment, the clamping and opening are performed by the air cylinder 15 in which a large stroke is easily obtained, and the clamping pressure is maintained by the hydraulic cylinder 50, particularly the booster 60 in which a high pressure is easily obtained. Thus, the entire apparatus can be made compact and space-saving, and can be manufactured at a low cost.

<Embodiment 3>
10 to 13 show Embodiment 3 of the present invention.
Also in the third embodiment, changes are mainly made to the arrangement position and the like of the movable receiving portion, and the difference will be mainly described below.
In the third embodiment, the support plate 70 is stretched at a position corresponding to the upper surface of the lower frame 24 in the C frame 20, and the piston rod 16 of the upward air cylinder 15 passes through the through hole 71 of the support plate 70. The lower die plate 31Y is connected to the lower die plate 31Y, and the lower die plate 31Y is placed on the support plate 70 when the piston rod 16 is contracted and opened.

On the other hand, a horizontal mounting plate 72 is passed between the side plates 21 at a position corresponding to the lower side of the connecting portion 25 in the C frame 20, and a movable receiver 78 is placed at the center in the width direction on the mounting plate 72. The driving air cylinder 75 is installed in a forward-facing horizontal posture, and a movable receiving body 78 is attached to the tip of the piston rod 76. As shown in FIG. 13, the movable receiver 78 is formed in a planar gate shape having a corresponding height, and is attached with the opening 79 facing forward. The movable receiver 78 is slidable on the support plate 70.
In a state where the piston rod 76 of the forward air cylinder 75 is contracted, the movable receiver 78 moves to a position (reception release position R2) retracted rearward from the ascending / descending region of the lower die plate 31Y, while the piston In a state where the rod 76 is extended, the movable receiving body 78 moves to a position (receiving position R1) corresponding to the center of the plane of the lower die plate 31Y while sliding on the support plate 70. That is, as the piston rod 76 of the forward-facing air cylinder 75 expands and contracts, the movable receiver 78 can reciprocate between the receiving position R1 and the receiving release position R2.

The operation of the third embodiment is as follows.
Initially, as shown by the solid line in FIG. 10, the piston rods 76 of the forward air cylinders 75 are contracted, the movable receiver 78 is retracted to the receiving release position R2, and the piston of the upward air cylinder 15 is moved. The rod 16 contracts and is in the mold open state. When the piston rod 16 of the upward air cylinder 15 extends from this mold open state, the lower mold 30Y rises together with the lower die plate 31Y and the hydraulic cylinder 50 (arrow I in FIG. 10), and the mold is clamped ( (See FIG. 11). At this time, a clearance S is secured between the lower die plate 31Y and the movable receiver 78.

Subsequently, when the piston rod 76 of the forward air cylinder 75 extends, as shown by an arrow II in FIG. 10, the movable rod is inserted while the piston rod 16 of the upward air cylinder 15 is inserted through the opening 79 and escaped. 78 moves to the receiving position R1, and the movable receiving body 78 itself is received by the support plate 70 (FIG. 11). From this state, when the piston rod 16 of the upward air cylinder 15 contracts by a predetermined amount (S), the lower die 30Y side is lowered, and the lower die plate 31Y is received by the movable receiver 78 (see FIG. 12). At the same time, as indicated by the chain line in the figure, a gap is opened between the upper mold 30X and the lower mold 30Y by the same dimension (S), and in such a state, the molten resin is injected into the molding recess of the lower mold 30Y at a low pressure. The
Then, the hydraulic cylinders 50 are driven all at once, and the rod moves up with high thrust, and the lower die 30Y is pushed up as shown by the arrow III in FIG. 10, and as shown by the solid line in FIG. The upper and lower dies 30X and 30Y are clamped at high pressure while the upper and lower die plates 31X and 31Y are sandwiched between the upper frame 23 of the C frame 20 and the movable receiving body 78, and pressed. The pressure is maintained, and a resin molded product is molded during this time.

When the drive of the hydraulic cylinder 50 is released after a predetermined high-pressure clamping time has elapsed, the lower mold 30Y is lowered to the original position as shown by the arrow IV in FIG. 13, and then the piston rod 16 of the upward air cylinder 15 is moved. Is once extended by a predetermined amount (S), the lower die 30Y side is lifted to be in a clamped state, and a clearance S is secured between the lower die plate 31Y and the movable receiver 78 (FIG. 11). reference). From this state, the piston rod 76 of the forward-facing air cylinder 75 is contracted, so that the movable receiver 78 moves to the receiving release position R2, as indicated by the arrow V in FIG.
Finally, when the piston rod 16 of the upward air cylinder 15 contracts to the original position, the lower mold 30Y is lowered, that is, the mold is opened as shown by the arrow VI in FIG. 10, and the resin molded product is taken out. Thereafter, the above operation is repeated.

  In the third embodiment, since the movable receiver 78 is formed in a gate shape, the piston rod 16 of the upwardly facing air cylinder 15 is released into the movable receiver 78 when it advances to the receiving position R1. Since it reaches the central portion of the lower surface of the die plate 31Y, it can be received more stably when receiving a reaction force of high pressure clamping with the upper frame 23.

<Embodiment 4>
14 to 20 show Embodiment 4 of the present invention.
In the fourth embodiment, similarly to the third embodiment, the support plate 70A is stretched at a position corresponding to the upper surface of the lower frame 24 in the C frame 20, and the movable receiving portion includes the lower die plate 31Y and the support plate 70A. It is a longitudinally extending tension plate 80 interposed between the two. The piston rod 16 of the upward air cylinder 15 passes through the through hole 71 of the support plate 70A and is connected to the lower die plate 31Y.

The strut plate 80 is formed in a thick and vertically long rectangular shape, and the upper end of the strut plate 80 is swingably supported by a hinge 81 at an intermediate depth position at the left and right side edges of the lower die plate 31Y. In the natural state, as shown in FIG. 18, the tension plate 80 hangs in a vertical posture due to its own weight, and the upper end surface is in contact with the lower surface of the lower die plate 31Y. The position where the tension plate 80 is in the vertical position is the receiving position R1, and when the tension plate 80 is at the receiving position R1, its lower end faces the upper surfaces of the left and right side edges of the support plate 70A.
On the other hand, both the strut plates 80 are detached from the upper surface of the lower die plate 31Y by swinging the lower ends thereof outward, and the position where the lower plates are shaken to take an oblique posture is the receiving release position R2 ( (See FIG. 20).

A drive mechanism 85 is provided for moving both the tension plates 80 from the receiving position R1 toward the receiving release position R2. This drive mechanism 85 has a four-joint link 86 formed by connecting four links 87 in a diamond shape. As shown in FIG. 16, the four-joint link 86 is a region on the front side of the support plate 70A ( On the upper surface of the left side of the figure, the piston rod 16 of the upward air cylinder 15 is inserted into the inside, and a connection point 89A on the front side of the four-bar link 86 is a front edge of the support plate 70A. Is fixed at the center position in the width direction.
On the other hand, an air cylinder 90 is installed in a forward horizontal posture on the upper surface on the back side of the support plate 70A, and a connection point 89B on the back side of the four-bar link 86 is connected to the tip of the piston rod 91. Therefore, as the piston rod 91 of the air cylinder 90 extends, the four-bar link 86 changes its rhombus shape, and the left and right connection points 89C and 89D are displaced so as to be in contact with each other.

  In particular, when the piston rod 91 of the air cylinder 90 contracts, as shown in FIG. 16, the left and right connecting points 89C and 89D of the four-bar link 86 approach each other and close in the left and right direction. 89C and 89D are located immediately inside the two tension plates 80 at the receiving position R1. On the other hand, when the piston rod 91 extends, as shown in FIG. 17, the left and right connecting points 89C and 89D are spaced apart from each other and open in the left and right directions, and the left and right connecting points 89C and 89D are connected to the support plate 70A. It moves to the position of the left and right side edges.

Then, the effect | action of Embodiment 4 is demonstrated.
Initially, as shown in FIGS. 14 and 15, the piston rod 16 of the upward air cylinder 15 is contracted and is in the mold open state, and the tension plate 80 escapes to the receiving release position R2 to the left and right sides of the support plate 70A. It is on the edge. Further, the piston rod 91 of the forward air cylinder 90 is contracted, and the four-bar link 86 is closed in the left-right direction.
When the piston rod 16 of the upward air cylinder 15 extends from this mold open state, the lower die plate 31Y and the hydraulic cylinder 50 both raise the lower mold 30Y (arrow I in FIG. 15), as shown in FIG. Clamped to During this time, as shown by the arrow II in FIG. 15, the tension plate 80 swings to a vertical posture by its own weight. At this time, there is a clearance S between the lower surface of the tension plate 80 and the support plate 70A.

From this state, when the piston rod 16 of the upward air cylinder 15 contracts by a predetermined amount (S), the lower die 30Y side is lowered, and as shown in FIG. 19, the lower surfaces of the two tension plates 80 abut against the support plate 70A. . At the same time, as indicated by the chain line in the figure, a gap is opened between the upper mold 30X and the lower mold 30Y by the same dimension (S), and in such a state, the molten resin is injected into the molding recess of the lower mold 30Y at a low pressure. The
Then, the hydraulic cylinders 50 are driven all at once, and the rod 52 moves up with high thrust, and the lower die 30Y is pushed up as shown by the arrow III in FIG. 19, and as shown by the solid line in FIG. The upper die 30X is pressed against the upper die 30X, that is, the upper and lower die plates 31X and 31Y are sandwiched between the upper frame 23 of the C frame 20 and the tension plate 80, and the upper and lower die 30X and 30Y are clamped at high pressure. The pressure is maintained, and a resin molded product is molded during this time.

When the drive of the hydraulic cylinder 50 is released after a predetermined high-pressure clamping time has elapsed, the lower mold 30Y is lowered to the original position as shown by the arrow IV in FIG. 19, and then the piston rod 16 of the upward air cylinder 15 is moved. Is once extended by a predetermined amount (S), the lower die 30Y side is lifted to be in a clamped state, and the lower surface of the tension plate 80 is lifted from the support plate 70A (FIG. 18).
From this state, when the piston rod 91 of the air cylinder 90 facing forward is extended, the four-bar link 86 opens as shown in FIG. 17 and jumps to the receiving release position R2 as shown by the arrow V in FIG. It is done.
Subsequently, when the piston rod 16 of the upward air cylinder 15 contracts to the original position, as shown by the arrow VI in FIG. 15, the lower plate is moved along the right and left side edges of the support plate 70A. 30Y is lowered, that is, the mold is opened, and the resin molded product is taken out. At the same time, the piston rod 91 of the forward air cylinder 90 contracts, and the four-bar link 86 is closed and waits. Thereafter, the above operation is repeated.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) Contrary to the above-described embodiment, the upper die side can be driven up and down by a vertically oriented air cylinder, and a hydraulic cylinder can be provided between the upper die and the upper die plate. In this case, the lower frame of the C frame serves as a fixed receiving portion, and the movable receiving portion is put in and out of the upper surface side of the upper die plate.
(2) The present invention is a type of molding a resin molded product by injecting a molten resin at a high pressure into a cavity formed between both molds from a state in which a pair of molding dies are clamped at high pressure, and solidifying. The same can be applied to an injection molding machine.
(3) Furthermore, the present invention can also be applied to a horizontal injection molding machine in which a pair of molding dies are arranged opposite to each other so as to be able to contact and separate in the horizontal direction.

Sectional drawing for demonstrating the shaping | molding process which concerns on Embodiment 1 of this invention. Front view showing the clamped state Partial front view showing the high-pressure clamping state Cross section of hydraulic cylinder with booster Perspective view when the movable receiver is in the receiving release position Perspective view when in the receiving position Side sectional view according to Embodiment 2 Partially cutaway front view showing mold open Partially cutaway front view showing high-pressure clamping state Sectional drawing for demonstrating the shaping | molding process which concerns on Embodiment 3. FIG. Side sectional view showing the clamped state Front view showing the high-pressure clamping state Perspective view showing advance / retreat operation of movable body Side view according to Embodiment 4 Front view showing mold open Top view when the tension plate is in the receiving position Top view when retreated to the receiving release position Front view showing the clamped state Front view showing the high-pressure clamping state Front view when the tension plate is retracted to the receiving release position

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Base 15 ... Air cylinder 16 ... Piston rod 20 ... C frame (frame)
23 ... Upper frame (fixed receiving part)
24 ... Lower frame (guide)
25 ... Connecting part 30X ... Upper mold (second molding die)
30Y ... Lower mold (first mold)
31X ... Upper die plate 31Y ... Lower die plate (die plate)
40 ... Movable receiver (movable receiver)
41 ... receiving surface 42 ... fitting groove 45 ... (another) air cylinder 48 ... guide recess (insertion hole)
50 ... Hydraulic cylinder 52 ... Rod 60 ... Booster (Pneumatic-hydraulic converter)
65 ... (another) air cylinder 68 ... Movable receiving plate (movable receiving part)
70A ... support plate 75 ... (another) air cylinder 78 ... movable receiver (movable receiver)
80 ... Stretch plate (movable receiving part)
81 ... Hinge 85 ... Drive mechanism (tension release means)
86 ... Four-bar link 90 ... Air cylinder R1 ... Receiving position R2 ... Receiving release position

Claims (7)

First and second molding dies arranged opposite to each other so as to be able to contact and separate;
A die plate disposed on a surface of the first molding die opposite to the side facing the second molding die;
A hydraulic cylinder that is disposed between the die plate and the first molding die and can be driven with air as a drive source via an air-hydraulic converter;
An air cylinder for moving the first molding die including the die plate and the second molding die in the contact / separation direction;
A fixed receiving portion facing either one of the die plate and the second molding die of the first molding die in a state where the both molding dies are clamped;
A receiving position where the two molds clamped opposite to the other can be clamped between the fixed receiving portion and a receiving release position where the opposed state of the fixed receiving portion is released And a movable receiving part that is moved between,
An injection molding machine characterized in that mold clamping and mold opening of both molding dies are performed by driving the air cylinder, and holding of mold clamping pressure is performed by driving the hydraulic cylinder. The first and second molding dies are arranged to face each other in the vertical direction, and are mounted on a C frame in which one end of a horizontal upper and lower frame is connected to each other by a vertical connecting portion,
One of the upper and lower frames of the C frame serves as the fixed receiving portion, and either the die plate or the second molding die of the first molding die is fixed,
The air cylinder is provided vertically between the other of the die plate and the second molding die of the first molding die and a horizontal base,
The movable receiving portion is provided on the outer surface side of the die plate of the first molding die or the outer surface side of the second molding die on the side connected to the air cylinder in a mold-clamping state. The injection molding machine according to claim 1. The second molding die is arranged on the upper side, the first molding die is arranged on the lower side, and the second molding die is fixed to the upper frame serving as the fixed receiving portion in the C frame. In addition, the die plate of the first molding die is connected to the air cylinder, and the movable receiving portion is moved in the mold clamping state by another lateral air cylinder provided in the C frame. 3. The injection molding machine according to claim 2, wherein the injection molding machine is provided on the lower surface side of the die plate so as to be able to advance and retract. The movable receiving portion is movable with the lower frame of the C frame as a guide, and its upper surface is a receiving surface that receives the lower surface of the die plate, and the die plate includes the movable receiving portion. An insertion hole is formed through which the movable receiving portion can be moved up and down, and the movable receiving portion has a receiving position corresponding to a position away from the insertion hole on the lower surface of the die plate and a receiving release corresponding to the insertion hole. The injection molding machine according to claim 3, wherein the injection molding machine is driven to move forward and backward. A pair of the lateral air cylinders are provided in a posture facing each other, and a movable receiving portion capable of receiving the lower surfaces of the opposing edges of the die plate is provided at the extended ends of the lateral air cylinders. The injection molding machine according to claim 3, wherein the injection molding machine is provided. The injection molding machine according to claim 3, wherein the movable receiving portion is formed in a substantially portal shape that allows the vertical air cylinder to be fitted and escaped from a radial direction. The second molding die is arranged on the upper side, the first molding die is arranged on the lower side, and the second molding die is fixed to the upper frame serving as the fixed receiving portion in the C frame. And the die plate of the first molding die is connected to the air cylinder, and the movable receiving portion is pivotally supported on the lower surface side of the die plate so as to be swingable.
When the die plate rises to clamp the mold, the movable receiving portion takes a suspended posture by its own weight and can be stretched between the lower frame of the C frame and is in a suspended posture. 3. A tension release means for releasing the tension state and allowing the die plate to descend by pressing the movable receiving portion and swinging it to the side is provided. The injection molding machine described.

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