JPH03202334A - Injection compression molding process and its machine - Google Patents

Abstract

PURPOSE:To carry out easily and exactly the setting of the compressing amount of each cavity unit and the control of compressing by a method in which the compressing amount is set by regulating mechanically the position of the retreating limit of each compressing core provided correspondingly to a plurality of cavities, and each compressing core is enabled to form under pressurizing independently. CONSTITUTION:Compressing cores 4a... constitute parts of cavities 3a and are provided in stationary molds 26 capably of advancing and retreating. The core-fitting plate 16 which can advance and retreate and is provided in the intermediate position of the stationary mold 26 is retracted with a plurality of cylinders 18a, 18b for retraction fitted to the outer surface of a stationary platen 22. The position-regulating parts 17a, 17b provided between the core-fitting plate 16 and the stationary platen 22 and regulating the position of the retreating limit of the core-fitting plate 16, are constructed by screwing the rear outer peripheral screw parts 55a, 55b of regulating sleeves 54a, 54b through a piston rod 52a, on the stationary platen 22. The cylinders 11a, 11b for pressurizing are provided on the rear of the stationary mold 26. The tips pressurizing pistons 12a, 12b are arranged to pressurize the rear end of the compressing core 4a. The pressurizing cylinders 11a are provided for each cavity 3a independently and do not interfer with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an injection compression molding method and an injection compression molding machine that perform resin molding through an injection process and a compression process.

[Prior art and issues]

Conventionally, there has been known an injection compression molding method in which resin is injected and filled into a slightly open mold cavity, and then the resin is compressed by a compression core to perform molding. According to this molding method, it is possible to equalize the internal pressure in the cavity during compression and to appropriately control the compression force as the resin cools, so cooling is performed in an equal volume throughout the entire molded product, which results in internal distortion. A molded article with high dimensional accuracy can be obtained due to the small amount of surface transfer and good surface transferability. Therefore, it is possible to reduce birefringence caused by internal strain that tends to occur in molded products with large differences in wall thickness, and it is also ideal for molding lenses and various precision molded products that require high surface transferability, and the same molding method can be used. The present applicant has already proposed an injection molding machine (mold clamping device) (for example, see Japanese Patent Publication No. 1-22136).

By the way, the molding process using the injection compression molding method is only possible by controlling the resin volume and resin pressure within the cavity with high precision. In other words, during injection filling, the temperature, injection pressure, injection speed, and filling amount are controlled, and during compression,
It is necessary to control the compression pressure, compression time, and amount of compression with high precision, and in addition, with respect to the mold, it is necessary to repeatedly reproduce the temperature of the cavity between molding steps with high precision. Note that each of these control elements is related to each other, and each control element has a certain tolerance range for obtaining a good molded product.

Since the conventional injection compression molding machine (injection compression molding method) is based on the premise of so-called one-piece molding, setting of each of these control elements is relatively easy. However, in order to increase productivity, it is difficult to mold a molded product even if the conventional injection compression molding method is directly applied when molded products are produced in multiple pieces.

In other words, when making multiple pieces, even if multiple compression cores are mechanically connected and compressed at the same time, the control elements other than the compression operation, such as the amount of resin in the cavity, the resin pressure, the resin temperature, and the mold temperature. causes large variations from cavity to cavity. Since the tolerance range of each of these control elements is extremely narrow (ideally the same), it is difficult to tolerate variations that actually occur. Furthermore, even if the allowable width of the control element that allows a good molded product to be obtained in a single cavity is applied, the internal pressure of each cavity during compression will not be the same (-
cavities are too large and other cavities are too small), a good molded product cannot be obtained.

In the end, in order to match the above control elements between cavities, it is necessary to significantly increase the control accuracy, and trial and error mold manufacturing and adjustment for each cavity are required, and the production conditions There was a problem in that it required a large amount of money and time to establish the system.

The object of the present invention is to provide an injection compression molding method that solves the problems existing in the conventional technology, and an injection compression molding machine that can be used in the same method.

[Means to solve the problem]

The injection compression molding method according to the present invention includes a compression step of injecting resin into a mold cavity and then compressing the resin in the cavity with a compression core to perform molding. , 3b, 3c
, 3d, each compression core 4a, 4b, 4c,
The compression amount is set by mechanically adjusting the retraction limit position of 4d, and each compression core 4a is individually pressurized and molded in the compression process.

Moreover, injection compression molding machines 1a and lb according to the present invention.

lc is an injection compression molding machine equipped with a compression device that compresses the resin injected into the mold cavity.
is provided with a plurality of cavities 3a..., compression cores 4a... corresponding to each cavity 3a..., and pressurizing mechanisms 5a, 5b provided individually to pressurize each compression core 4a... . . . and retraction mechanisms 6a, 6b for retracting each compression core 4a with respect to the cavity 3a.
. . . and a stopper mechanism 7a whose position is adjustable for regulating the retraction limit position of each compression core 4a .

It is characterized by comprising compression devices 8a, 8b, . . . having compressors 7b, . In this case, the pressure mechanism 5a...
are pressurizing cylinders lla, i which pressurize the rear ends of the compression cores 4a... by the pressurizing pistons 12a, 12b...
tb... and a stopper mechanism 7a.
. . can be provided with stob bar rods 13a, 13b . . . facing the inside of the pressurizing cylinder lla . In this case, it is desirable that the stob parrots 13a are disposed on the same axis as the corresponding compression cores 4a. Moreover, the pressurizing mechanism 5a... each compression core 4a...
- A superelastic alloy 15a that pressurizes the rear end of the superelastic alloy 15a.

1, 5 b... On the other hand, the retraction mechanism 6a... includes a core mounting plate 16 that can simultaneously move the compression cores 4a... back, position adjustment parts 17a and 17b that can adjust the retreating position of the core mounting plate I6, and the core mounting plate 16. A spring 19 is provided with retraction cylinders 18a and 18b for retracting the
a, 19b, . . . .

[For production]

Injection compression molding method according to the present invention (injection compression molding machine 1a,
According to Ib, Ic), first, a plurality of cavities 3a... are provided in the mold 2.

The retraction limit positions of the compression cores 4a... are mechanically adjusted in advance, thereby setting the amount of compression of the resin P. In addition,
At the backward limit position, the position is further restricted by the stopper mechanism 7a. As a result, in the injection process, each compression core 4
are set at the retraction limit position by retracting them by the retraction mechanisms 6a, and each slightly opened cavity 3a is injected and filled with resin P. and,
The injection pressure at this time is received by the stopper mechanism 7a.

On the other hand, in the compression process, the corresponding compression cores 4a... are individually pressurized by the respective pressure mechanisms 5a... in the compression devices 8a.... As a result, each cavity 3a...
Mutual interference in each cavity 3a...
Compression is performed that is appropriate for the conditions.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

(First Example) First, the first example will be described. 1 to 3 show an injection compression molding machine 1a according to a first embodiment.

First, the overall structure of the injection compression molding machine 1a will be explained with reference to FIGS. 1 and 2. In FIG. 1, the upper half shows the mold clamped state, and the lower half shows the mold open state.

The injection compression molding machine 1a includes a direct pressure mold clamping device 2I that supports the mold 2. The mold clamping device 21 includes a fixed platen 22, a mold clamping cylinder 23 spaced apart from the fixed platen 22, and a fixed platen 22.
The movable platen 25 is equipped with a plurality of parallel tie bars 24a, 24b... installed between the mold clamping cylinder 23, and a movable platen 25 slidably loaded on each tie bar 242L...
is moved forward and backward by the mold clamping cylinder 23.

In addition, a fixed mold 26 is attached to the fixed platen 22, and
A movable mold 27 is attached to the movable platen 25, and the fixed mold 26 and the movable mold 27 constitute the mold 2. As shown in Figure 2, there are two molds 2 in vertically symmetrical positions (-there are multiple molds in the membrane).
cavity 3a.

3b, and each cavity 3a... has a gate part 28a.
, 28b1 communicates with the central sprue section 30 via runner sections 29a and 29b. The sprue portion 30 is communicatively connected to an injection nozzle 42 of an injection device 4I shown by a phantom line.

On the other hand, the fixed mold 26 is provided with compression devices 8a and 8b corresponding to each cavity 3a. The compression device 8a'' includes compression cores 4a, 4b, retraction mechanisms 62L16b1, pressure mechanisms 5a, 5b1, and stopper mechanisms 7a, 7b.

First, the compression core 4a... is the − of the cavity 3a...
It is provided in the fixed mold 26 so as to be movable forward and backward.

The retraction mechanism 6a... includes a core mounting plate 16 that is provided at an intermediate position of the fixed mold 26 and is movable back and forth. The movement range of the core mounting plate 16 is within a range with a predetermined margin for the maximum compression amount. The core mounting plate 16 also includes a plurality of retreating cylinders (hydraulic cylinders) attached to the outer surface of the fixed platen 22.
18a and 18b. in this case,
A retreat piston 51a built into each retreat cylinder 18a...

The piston rods 52a and 52b of 51b pass through the fixed plate 22, and their tips are fixed near the outer periphery of the core mounting plate 16. Also, between the core mounting plate 16 and the fixed plate 22, position adjustment parts 17a and 17 for adjusting the retraction limit position of the core mounting plate 16 are provided.
b. The position adjusting section 17a... includes adjusting sleeves 54a, 54b passed through the piston rod 52a..., and is configured by screwing threaded portions 55a155b provided on the rear outer periphery of the sleeves 54a, 54b to the fixed plate 22. , the retraction limit position of the core mounting plate 16 is adjusted by turning the adjusting sleeves 54a, . . . in the forward or reverse direction.

In addition, 53a, 53b... are adjustment sleeves 54a...
・This is the fixing nut. On the other hand, each compression core 4a... is passed through the core mounting plate 16 and is mutually engaged with the core mounting plate 51 so that displacement within a certain range is allowed.

The pressurizing mechanism 5a... includes pressurizing cylinders (hydraulic cylinders) Ila and Ilb provided at the rear of the fixed mold 26, and the pressurizing pistons 12a and 12b of the pressurizing cylinders Ila...
The front end of the compression core 4a is arranged to be able to press the rear end of the compression core 4a.

The stopper mechanism 7a... includes a stopper rod 13a... provided on the fixed platen 22, and a threaded portion 6 provided on the outer periphery of the stopper rod 13a...
5a and 65b are screwed onto the fixed platen 22. Therefore,
If you turn it in the forward or reverse direction, you can move it straight or backward and adjust its position. On the other hand, stopper rod 132L...
The tips of the pistons 12a and 12b face the insides of the pressurizing cylinders Ila and can come into contact with the rear ends of the pressurizing pistons 12a. In this case, the compression cores 4a..., the pressure pistons 12a..., and the stopper rods 13a... are arranged on the same axis.

In this way, the stopper rod 13a... is connected to the compression core 4a.
It is important to arrange the stopper rods 13a coaxially with the stopper rods 13a, . Note that 66a and 66b are fixing nuts.

On the other hand, movable cores 71a and 71b constituting a part of each cavity 3a are provided in the movable mold 27 so as to be movable forward and backward, and their rear ends are attached to the movable core mounting plate 72. The movable core mounting plate 72 is coupled to a protruding piston 76 built in the protruding cylinder 75 via protruding rods 73 a and 73 b provided on the movable platen 25 and a protruding plate 74 .

Therefore, the movable core 71a... is the protruding cylinder 75.
It is moved forward and backward by. Note that the movable platen 25 is fixed to the tip of the mold clamping piston 31 of the mold clamping cylinder 23 mentioned above.

Next, an injection compression molding method using the injection compression molding machine 1 will be explained, including the positional relationship of each part, with reference to FIGS. 1 and 3.

First, prior to molding, the amount of compression for the tree ip in the cavity 3a- is set in advance. When setting, loosen each fixing nut 53a...66a... and tighten the stopper rod 13a... in each stopper mechanism 7a...
− is set back. In this state, the adjustment sleeve 54a
... to set the retraction limit position of the compression core 4a, that is, the compression amount. After setting the backward limit position, tighten the fixed knob 53a... and adjust the adjustment sleeve 54a...
・Fix. Further, the pressure cylinders lla... are depressurized, and the retreating cylinders 18a... are driven to set the core mounting plate 16 at the retreating limit position. Then, in this state, rotate the stopper rod 13a to advance the compression core 4a, the pressurizing piston 12a,
... and the stopper rods 13a...- are brought into contact with each other. When they come into contact, the fixing knobs 66a... are tightened, and the stopper rods 13a... are fixed. As a result, the amount of compression is adjusted by the adjustment sleeve 54a... and the stopper rod 13.
It will be set mechanically by a...

Next, the molding cycle will be explained. First, the movable platen 25 is advanced by the mold clamping cylinder 23 of the mold clamping device 21,
Perform mold clamping. Further, the pressurizing cylinders lla... are depressurized, and the retreating cylinders 182L... are driven to retreat the core mounting plate 16 and set it at the retreating limit position. As a result, each cavity 3a・-
・ will be in a slightly open state.

In the injection process, the injection device 41 injects and fills each cavity 3a with the resin P. This state is shown in the upper half of FIG.

Upon completion of injection filling, the process moves to the compression process. In the compression process, the pressure is released from the retraction cylinder 18a..., and
Drive the pressurizing cylinder lla... and pressurizing piston 1
By sharpening 2a..., the compressed core 4a...
Pressurize. As a result, the resin P within each cavity 3a is compressed. In this case, each pressurizing cylinder Ila
... may be supplied with a common pressure oil, or may be supplied with pressure oil from different systems from different hydraulic circuits. In either case, each pressurizing cylinder Ila... is provided individually for each cavity 3a... and therefore operates without mutual interference. This state is shown in FIG.

Then, after a predetermined cooling time has elapsed, the mold clamping device 21
The mold clamping cylinder 23 causes the mold clamping piston 31 to retreat, and the movable platen 25 is separated from the fixed platen 22. This opens the mold. Next, when the ejection cylinder 75 is driven and the ejection piston 76 is advanced, the movable cores 71a... move forward and the molded product S is ejected. This state is shown in the lower half of FIG.

(Second Example) Next, a second example will be described. FIG. 4 shows an injection compression molding machine 1b according to a second embodiment. In the figure, the upper half shows the mold clamped state, and the lower half shows the mold open state. In addition, in the configuration shown in FIG. 4, the same functional parts as in FIG. 1 are given the same reference numerals to clarify the configuration. Therefore, description of the same functional parts will be omitted.

The injection compression molding machine 1b according to the second embodiment differs from the first embodiment in that a retraction mechanism 6a is provided on the movable platen 25 side, and that superelastic alloys 15a and 15b are used for the pressure mechanisms 5a and 5b.

In FIG. 4, 18a is a retraction cylinder provided on the movable platen 25, and the built-in retraction piston 52a includes first retraction rods 91a, 91b, second retraction rod 92a,
92b, coupled to the core mounting plate 16 via third retraction rods 93a, 93b.

Further, the retraction limit position of the core mounting plate 16 is set by stopper rods 95a and 95b of second stopper mechanisms 94a and 94b provided on the fixed platen 22.

The stopper rods 95a are screwed into the fixed plate 22 by threaded portions provided on their outer peripheries, and their tips face the core mounting plate 16. Note that 96a and 96b are fixing nuts.

On the other hand, the superelastic alloy 15a in the pressing mechanism 5a...
. . is formed into a rod shape so that its tip faces the compression cores 4a, 4b, and is movable forward and backward within the fixed mold 26. In addition, the fixed plate 22 includes a superelastic alloy 15a.
Stopper mechanisms 7a, 7 that regulate the position of ... in the backward direction
b. The stopper rods 13aS 13b of the stopper mechanisms 7a... are disposed opposite to and coaxially with the rear ends of the superelastic alloys 15a.... Stopper rod 13a
. . . indicates a threaded portion 652 provided on the outer periphery as in the first embodiment.
It is screwed onto the fixed platen 22 by L, 65b, and fixed by a fixing nut 66a166b. In addition, the stopper rod 13a... in this stopper mechanism 7a...
has the function of directly contacting the superelastic alloy 15a... to receive injection pressure during injection, and adjusting the position of the superelastic alloy 15a... to adjust the compressive force during compression. It is used for both purposes.

Therefore, if the retraction cylinder 18a of the retraction mechanism 6a is driven and the core mounting plate I6 is pressed, the compression cores 4a... will retreat, and the core mounting plate 16 will move the stopper rod 95a...
It will stop at the position where it touches. At this time, the superelastic alloy 15a
... are compressed (elastically deformed) by the pressing force of the core mounting plate 16, and mechanical energy is accumulated. In this case, pressurized oil is supplied to the retraction cylinder 18a to maintain the core mounting plate I6 at the retraction limit position until injection filling is completed. On the other hand, when the retracting cylinder 18a is depressurized during compression, the stored energy of the superelastic alloy 15a is released, so that the superelastic alloy 15a returns elastically. Therefore, at this time, the compression cores 4+L... move forward due to the elastic force and compress the resin P under pressure.

(Third Example) Next, a third example will be described. 5 to 9 show an injection compression molding machine 1c according to a third embodiment. Note that in FIGS. 5 to 9, the same functional parts as in FIG. 1 or 4 are given the same reference numerals to clarify their configurations.

First, the overall structure of the injection compression molding machine 1c will be explained with reference to FIGS. 5 to 8.

In the injection compression molding machine 1c, 2 is a mold, which is supported by a mold clamping device 21. The mold clamping device 21 includes a fixed platen 22 provided at the upper part, a plurality of parallel tie bars 24a, 24b, etc. whose upper ends are fixed to the fixed platen 22, and each tie bar 242L.
... is provided with a movable platen 25 slidably loaded therein, and the movable platen 25 is moved forward and backward by a mold clamping cylinder 23 (detailed drawings are omitted).

In addition, a fixed mold 26 is attached to the fixed platen 22, and
A movable die 27 is attached to the movable platen 25, and the fixed die 26 and the movable die 27 constitute the mold 2. As shown in FIG.
a, 3b, 3c, 3d, each cavity 3a...-
are gate parts 28a128b, 28c, 28d
, communicates with the central sprue section 30 via runner sections 29a, 29b, 29c, and 29d. The sprue portion 30 is communicatively connected to an injection nozzle 42 of an injection device 41 shown by a phantom line.

On the other hand, a compression block 101 is attached to the movable platen 25, and within this block 101, compression devices 8a, 8b, . . . corresponding to each cavity 3a, .

In compression device 8a-, 4hs 4bs 4C.

4d is a compression core corresponding to the cavity 3a, and is provided within the movable mold 27 so as to be movable forward and backward.

Further, 5a, 5b... are pressure mechanisms, and the compression core 4
Core pressure plates 102a, 102 fixed to the rear end of a...
b... is provided. The core pressurizing plates 102a... are connected to the pressurizing pistons of the pressurizing cylinders lla, llb... via the transmission spacer groups 103a, 103b...! 2 Yu, 1
2b... is bonded to. Note that the core pressure plate 102a...
・Secure a range of movement with a predetermined margin for the maximum compression amount.

On the other hand, reference numerals 6a, 6b, . 102a..., that is, compression core 4a...
- Forces the to move backward.

Further, 7a, 7b... are stopper mechanisms, the tip of which faces the inside of the pressurizing cylinder lla... and a stopper rod l that faces the rear end of the pressurizing piston 12a...
3 a, 13 b, 13 c, 13 d
Equipped with

Each stopper rod 13a... has a threaded portion 6 provided on the outer periphery.
5a, 65b, . . . are screwed into the compression block 101. In addition, the rear ends of the stopper rods 132L... are exposed from the compression block 101, and the position adjustment parts 106a, 1
Rotated by 06b% 106cS 106d. As shown in FIG. 8, the position adjustment part 106a (same as 106b to 106d) has a driven sprocket 107a attached to the rear end of the stopper rod 13a and a position injector 108a provided on the side of the compression block 101. Drive sprocket 1 provided on indicator 108a
09a, and a transmission chain 110a that spans each sprocket 107a and 109a, and the position of the stopper rod 13a can be accurately adjusted numerically by operating a position indicator 108a. As in the first embodiment, the pressure pistons 12a, . . . and the stopper rods 13a, . . . are arranged on the same axis for each compression core 4a, .

On the other hand, a protruding plate 111 is disposed below the core pressing plates 102a... A center rod 112 facing the sprue portion 30 is attached to the center of the protrusion plate 111, and a protrusion piston 76 built in a protrusion cylinder 75 is brought into contact with the center on the opposite side of the protrusion plate 111. In addition, there are gap compensation parts 115a, 115b-1 between the core pressure plate 102a... and the protrusion plate 111.
15d is installed. As shown in FIG. 9, the gap compensation part 115b (and the others) includes a horizontal cylinder 116b and a wedge body 117b that moves forward and backward by the horizontal cylinder 116b, and the inclined surface of this wedge body 117b is connected to the core pressing plate 102b. It comes into sliding contact with the sloped portion 118b formed in the.

Therefore, by moving the wedge bodies 117b forward, the core pressure plates 102b and the protruding plates 1. It fills the gap G between I1 and prevents the timing difference between the protrusion of the sprue-shaped part and the product part in the molded product.

Note that 121a and 121b- are stopper pins that prevent the core pressure plate 102 from overstroke.

Next, an injection compression molding method using the injection compression molding machine 1c will be explained, including the positional relationship and function of each part in the molding machine.

First, when setting the compression amount, the wedge bodies 117a... are set in the retreat position, and the position indicator 108a is set.
If you operate..., the stopper rod 13a... rotates and moves forward and backward (up and down), so the pressurizing piston 122L
..., that is, the amount of compression can be set by adjusting the retraction limit position of the compression core 4a....

In this case, the amount of compression is the position indicator 1O8a.
It is easily and accurately set using digital values.

Next, the molding cycle will be explained. First, the movable platen 26 is advanced by the mold clamping cylinder 23 of the mold clamping device 21,
Perform mold clamping. Further, the pressurizing cylinders lla... are depressurized. As a result, the core pressure plates 102a... are urged by the springs 19a..., so the compression cores 4a...
... is set at the backward limit position, and each cavity 3a.
... will be in a slightly open state.

In the injection process, the injection device 41 injects and fills each cavity 3a with the resin P.

Upon completion of injection filling, the process moves to the compression process. In the compression process, the compression cores 4a... are driven by driving the pressure cylinders Ila... and advance the pressure pistons 12a...
- Pressurize. As a result, the resin P within each cavity 3a is compressed. In this case, as in the first embodiment, common pressure oil may be supplied to each pressurizing cylinder Ila, or pressure oil from different systems may be supplied.

Then, after a predetermined cooling time has elapsed, the mold clamping device 21
The mold clamping cylinder 23 causes the mold clamping piston 31 to retreat, and the movable platen 25 is separated from the fixed platen 22. This opens the mold. At this time, the wedge cylinders 116a... are driven to insert the wedge bodies 117a... between the core pressure plates 102a... and the protruding plates 111 to fill the gap G. The timing for inserting the wedge bodies 117a may be either after the compression step (before the mold gap) or when the mold is opened. Next, by driving the ejection cylinder 75 and moving the ejection piston 76 forward, the movable cores 71a... move forward, and the molded product S
stand out.

Although each embodiment has been described in detail above, the present invention is not limited to such embodiments. For example, although a direct pressure type is illustrated as the mold clamping device, other types such as a toggle type may be used. Further, although the case where the plurality of cavities are the same is shown, the cases may be different. In this case, a retraction mechanism may be provided individually corresponding to each cavity, and the retraction limit position of the compression core may be directly set by a stopper mechanism. Furthermore, the arrangement positions of the mechanisms of each part can be arbitrarily selected within the range of not losing the function of each mechanism, and the mechanisms and parts of each part can be replaced with other mechanisms and parts having the same function. Other details such as the configuration can be arbitrarily changed without departing from the gist of the present invention.

〔Effect of the invention〕

As described above, the injection compression molding method (injection compression molding machine) according to the present invention sets the compression amount by mechanically adjusting the retraction limit position of each compression core provided in advance corresponding to a plurality of cavities, Since each compression core can be individually pressurized and molded during the compression process, it is possible to easily and reliably set the amount of compression for each cavity and control the compression when performing injection compression molding where multiple molded products are produced. As a result, good molded products can be obtained.

[Brief explanation of drawings]

Fig. 1 2 A vertical cross-sectional view of the injection compression molding machine according to the first embodiment of the present invention in a mold-clamped state (upper half) and a mold-opened state (lower half); Figure 3 is a partially enlarged vertical cross-sectional view showing the compression state of the injection compression molding machine according to the second embodiment of the present invention; FIG. 5 is a vertical cross-sectional view of the injection compression molding machine according to the third embodiment of the present invention, including a cross section taken along the line B-B in FIG. 7. Longitudinal cross-sectional view, Figure 6: A view of the injection compression molding machine in the direction C in Figure 5, Figure 7: A view in the direction C in Figure 5, Figure 8: View in the direction C in Figure 5. Figure 9: An enlarged vertical cross-sectional view of the gap compensation part in the same injection compression molding machine. In the drawings, l: injection compression molding machine 2: molds 3a13b, 3c, 3d: cavities 4a, 4b, 4
c, 4d: Compression cores 5a, 5b...: Pressure mechanisms 6a, 6b...: Retraction mechanisms 7a, 7b...: Stopper mechanisms 8a, 8b...: Compression devices 11a, Ilb...: Hydraulic cylinders 12a, 12b-: Pistons 13a, 13b...: Piston rods 15a, 15b
...: Superelastic alloy 16: Core mounting plates 17a, 17b =: Position adjustment portions 18a, 18b... -: Retraction cylinders 19a, 19
b... Nispring

Claims (1)

[Scope of Claims] [1] In an injection compression molding method comprising a compression step of injecting resin into a mold cavity and then compressing the resin in the cavity with a compression core to perform molding, a plurality of cavities are filled in advance. An injection compression molding method characterized in that the amount of compression is set by mechanically adjusting the retraction limit position of each compression core provided correspondingly, and each compression core is individually pressurized and molded in the compression process. . [2] In an injection compression molding machine that is equipped with a compression device that compresses the resin injected into the mold cavity, the mold is provided with a plurality of cavities, and a compression core corresponding to each cavity and each compression core are A compression device having an individually provided pressurizing mechanism for applying pressure, a retraction mechanism for retracting each compression core with respect to the cavity, and a stopper mechanism whose position is adjustable for regulating the retraction limit position of each compression core. An injection compression molding machine featuring: [3] The pressurizing mechanism is composed of a pressurizing cylinder that pressurizes the rear end of the compression core with a pressurizing piston, and the stopper mechanism includes a stopper rod that faces the inside of the pressurizing cylinder and faces the rear end of the pressurizing piston. The injection compression molding machine according to claim 2, further comprising: [4] The injection compression molding machine according to claim 3, wherein the stopper rod is disposed on the same axis as the corresponding compression core. [5] The injection compression molding machine according to claim 2, wherein the pressing mechanism uses a superelastic alloy that presses the rear end of each compression core. [6] The retraction mechanism is characterized by comprising a core mounting plate capable of simultaneously retracting each compression core, a position adjustment section capable of adjusting the retraction position of the core mounting plate, and a retraction cylinder for retracting the core mounting plate. The injection compression molding machine according to claim 2. [7] The injection compression molding machine according to claim 2, wherein the retraction mechanism is configured to allow each compression core to be individually retracted. [8] The injection compression molding machine according to claim 2, wherein the retraction mechanism is provided with a spring that can individually retract each compression core.