JP2006015548A - Injection compression mold assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly suppress the positional shift in the direction along each of the respective opposed surfaces of a core mold having a cavity forming part. <P>SOLUTION: The injection compression mold assembly 1 is equipped with a pair of molds 11 and 21 which form a cavity C between the mutually opposed surfaces 11a and 21a thereof at mold clamping and these molds 11 and 21 have templates 12 and 22 having the holes 11b and 21b formed to the opposed surfaces 11a and 21a and the core molds 13 and 23 which are arranged to the holes 11b and 21b and have cavity forming parts 13a and 23a. After a molten resin is injected in the cavity C, the molds 11 and 21 are further moved in a mold clamping direction to compress the resin in the mold clamping direction to manufacture an injection-molded product having inner and outer surfaces. In the mold assembly 1, a support 30, which restricts the core molds 13 and 23 in the direction along the opposed surface 11a and 21a and supports them in a freely sliding state with respect to the inner peripheral surfaces of the templates 12 and 22, is arranged between the core molds 13 and 23 and the templates 12 and 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is an injection compression mold apparatus for compressing and compressing a molten resin injected into a cavity, and is an injection suitable for manufacturing an injection molded product having an inner surface and an outer surface such as a lens and a battery case. The present invention relates to a compression mold apparatus.

  2. Description of the Related Art Conventionally, as an apparatus for producing an injection molded product, for example, as shown in Patent Document 1 below, it is provided so as to be able to approach and separate from each other, and a cavity is formed between opposed surfaces when clamping. A first mold and a second mold, and the first mold is disposed by being fitted into a first mold plate and a hole formed in the first mold plate, and the cavity A first core mold having a first cavity forming portion constituting a part of the inner surface of the first mold, and the second mold is fitted into a second mold plate and a hole formed in the second mold plate. And a second core mold having a second cavity forming part that constitutes a part of the inner surface of the cavity. Then, at the time of mold clamping, after injecting molten resin into the cavities formed by the first and second cavity forming portions, the entire first and second molds are further moved closer to the mold clamping direction, and the first The molten resin is compressed in the mold clamping direction by the second cavity forming portion.

  In such an injection compression molding apparatus, the molten resin is injected into a cavity (hereinafter simply referred to as “injection cavity”) larger than the volume of the injection molded product to be formed. The injection pressure can be lowered, and the pressure gradient in the cavity can be reduced. In addition, after injecting the molten resin into the injection cavity, the volume of the injection cavity is reduced and the molten resin after injection is pressurized and compressed, so that the molecular orientation of the obtained injection molded product can be made uniform. it can. As described above, an injection molded product can be molded with high accuracy without causing warpage or the like.

  By the way, in order to manufacture an injection molded product having an inner surface and an outer surface such as a lens and a battery case by using such an injection compression molding apparatus, the peripheral portion of the first cavity forming portion is opposed to the opposite portion. While projecting from the surface toward the second mold side, the central part in the direction along the facing surface is recessed to be away from the second mold, and the second cavity forming part is The convex portion is formed such that a peripheral portion thereof is recessed with respect to the facing surface in a direction away from the first mold while a central portion in a direction along the facing surface is protruded toward the first mold side. It needs to be shaped.

  Then, at the time of mold clamping, the outer peripheral surface of the peripheral portion of the first cavity forming portion is brought into sliding contact with the inner peripheral surface of the hole of the second mold plate, and the second cavity forming portion is formed as the first cavity. The cavity is formed by being inserted into the part. Next, after injecting the molten resin into the cavity, in the same manner as described above, the entire first and second molds are further moved closer to the mold clamping direction, and the molten resin is moved by the first and second cavity forming portions. Compress in the clamping direction. Thus, an injection molded product is manufactured in which the outer surface is molded by the first cavity forming portion and the inner surface is molded by the second cavity forming portion.

By the way, in such an injection compression molding die apparatus, at the time of clamping, the peripheral edge portion of the first cavity forming portion that protrudes from the facing surface toward the second die side is the second portion. Since it is necessary to make sliding contact with the inner peripheral surface of the hole of the template, the positioning of the first and second core molds in the direction along the facing surface is not performed with high accuracy. The peripheral edge may collide with the second mold side and the first and second molds may be lost.
JP-A-11-70555

  However, since either one of the first and second molds is generally provided with a hot runner communicating with the cavity, the temperature difference between these molds is large, and the sliding at the time of mold clamping is performed. In the process of manufacturing an injection molded product by contact, the first and second core molds are particularly easily displaced, and a simple and reliable means for preventing such displacement has been demanded.

  The present invention has been made in consideration of such circumstances, and press-compresses the molten resin injected into the cavity to produce an injection-molded product having inner and outer surfaces such as a lens and a battery case. Injection molding apparatus for injection molding, in which displacement of the first and second core molds in the direction along each facing surface is reliably suppressed, and the arrangement can be maintained with high accuracy. The purpose is to provide.

  In order to solve such problems and achieve the above-mentioned object, the injection compression molding die apparatus of the present invention is provided so as to be able to approach and separate from each other, and a cavity is formed between the opposing surfaces at the time of clamping. A first mold and a second mold configured to be configured, and the first mold is disposed by being fitted into the hole and a first mold plate having a hole formed in the facing surface And a first core mold having a first cavity forming portion that constitutes a part of the inner surface of the cavity, and the second mold includes a second mold plate having a hole formed in the facing surface, And a second core mold having a second cavity forming portion that is fitted to the hole and forms a part of the inner surface of the cavity, and the first cavity forming portion has a peripheral portion thereof Projecting from the facing surface toward the second mold side, along the facing surface The center part in the direction is a concave shape that is recessed in a direction away from the second mold, and the second cavity forming part has a circumferential edge part away from the first mold with respect to the opposing surface. On the other hand, the central portion in the direction along the facing surface is a convex shape that is convex toward the first mold side, and the outer peripheral surface of the peripheral portion of the first cavity forming portion is The cavity is formed by being brought into sliding contact with the inner peripheral surface of the hole of the second template and inserting the second cavity forming part into the first cavity forming part. After injecting the resin, the first and second molds are further moved closer to the clamping direction, and the molten resin is compressed in the clamping direction by the first and second cavity forming portions, and the outer surface is First mold An injection compression molding apparatus for manufacturing an injection-molded product whose inner surface is molded by the second cavity forming portion by the first forming portion, and between the first core die and the first mold plate. And at least one of the second core mold and the second mold plate, the first and second core molds are constrained in a direction along the facing surface, and the first and second molds are constrained. A support that is slidably supported with respect to the inner peripheral surface of the plate is provided.

  According to this invention, since the support is provided, it is possible to prevent the first and second core molds from being displaced in the direction along the facing surface in the process of manufacturing the injection molded product. Therefore, the arrangement can be maintained with high accuracy over a long period of time, and the peripheral portion of the first cavity forming portion can collide with the second mold during mold clamping, thereby preventing these molds from being lost. it can. Further, since the support body supports the first and second core molds slidably with respect to the inner surfaces of the first and second template plates, the core molds can be easily attached to the template plates. In spite of the configuration that can be incorporated and the defect can be suppressed, the cost of the apparatus can be suppressed, and for example, each core mold can be separated from each template separately. In this case, the sliding resistance at this time can be reduced.

Here, the support body is a spherical body or a cylindrical body disposed in a groove portion formed on the inner surface of the first and second template, and the outer diameter thereof is larger than the depth of the groove portion. Is desirable.
In this case, the first and second core molds are restrained by the support in the direction along the facing surface, and are reliably slidably supported on the inner surfaces of the first and second mold plates. can do.

In addition, it is preferable that a plurality of the first and second cavity forming portions are formed in the first and second core molds, and a plurality of cavities are formed between the opposing surfaces during mold clamping.
In this case, in particular, the first and second core molds are likely to be misaligned, and it is necessary to make the arrangement accuracy high, so that the above-described operational effects are remarkably exhibited.

  1 and 2 show an injection compression molding die apparatus 1 according to an embodiment of the present invention, which is provided so as to be able to approach and separate from each other and between opposing surfaces 11a and 21a facing each other at the time of mold clamping. A fixed mold (first mold) 11 and a movable mold (second mold) 21 configured to form the cavity C are provided.

  The fixed mold 11 is disposed in a fixed-side mold plate (first mold plate) 12 having a hole 11b formed in the opposing surface 11a, and fitted into the hole 11b, and a part of the inner surface of the cavity C. And a fixed-side core mold (first core mold) 13 having a fixed-side cavity forming section (first cavity forming section) 13a. Furthermore, a manifold portion (not shown) that supports the fixed side mold plate 12 and the fixed side core die 13 from the surface side opposite to the facing surface 11a, and an attachment that supports the manifold portion and is attached to an injection molding machine (not shown). And a board. Inside the manifold portion, a hot runner is formed which communicates with an injection nozzle of the injection molding machine and is supplied with molten resin in a heated state.

  Here, on the facing surface 11a of the fixed-side template 12, a fixed-side gate forming portion that opens to a concave curved surface described later of the fixed-side cavity forming portion 13a is formed. An injection hole (not shown) that penetrates the mold plate 12 in the mold clamping direction and communicates with the hot runner of the manifold section is formed at the outer edge of the fixed-side gate forming section. In addition, a guide hole 14 penetrating in the thickness direction is formed in the outer peripheral edge portion of the facing surface 11 a of the fixed-side template 12.

  The movable mold 21 is disposed by being fitted to the movable side mold plate (second mold plate) 22 having a hole 21b formed in the opposing surface 21a and the hole 21b, and a part of the inner surface of the cavity C. And a movable side core mold (second core mold) 23 having a movable cavity forming section (second cavity forming section) 23a. Furthermore, the movable side mold plate 22 and the movable side core mold 23 are supported from a surface side opposite to the facing surface 21a, a movable side receiving portion (not shown), and the receiving portion is supported, and an injection molding machine (not shown) is provided. The movable platen is attached to the movable platen, and the movable die 21 is supported so as to be able to advance and retract toward the facing surface 11a of the fixed die 11.

Here, a movable-side gate forming portion (not shown) that opens on the inner peripheral surface of the hole 21b is formed at a position facing the fixed-side gate forming portion on the facing surface 21a of the movable-side template 22. Further, a guide pin 24 is erected toward the fixed mold 11 at a position facing the guide hole 14 of the fixed mold 11 on the facing surface 21a. The outer diameter of the guide pin 24 is slightly smaller than the inner diameter of the guide hole 14 of the fixed mold 11.
The fixed-side cavity forming portion 13a and the movable-side cavity forming portion 23a of the present embodiment have a quadrangular shape in plan view together with the core dies 13 and 23 and the holes 11b and 21b.

The fixed cavity forming portion 13a has a peripheral portion protruding from the facing surface 11a toward the movable mold 21 side, while a central portion in a direction along the facing surface 11a is away from the movable die 21. It is a concave shape. In the example shown in the drawing, a concave curved body that is gradually curved in a direction away from the movable die 21 as it goes from the peripheral edge to the central portion, and the central portion is movable 21 from the opposing surface 11a. It is located in the position away from.
The movable-side cavity forming portion 23a is recessed with respect to the facing surface 21a in the direction in which the peripheral edge is separated from the fixed die 11, while the central portion in the direction along the facing surface 21a is protruded toward the fixed die 11 side. It is assumed to be a convex shape. In the example shown in the drawing, a convex curved body that is gradually convex toward the fixed mold 11 in a curved shape as it goes from the peripheral edge to the center.

  As described above, in the process in which the movable die 21 moves forward toward the fixed die 11, the guide pin 24 is in sliding contact with the inner peripheral surface of the guide hole 14, and the outer peripheral surface at the peripheral edge of the fixed core die 13 is movable. The cavity C is formed when the movable side cavity forming portion 23a enters the fixed side cavity forming portion 13a while being in sliding contact with the inner peripheral surface of the hole 21b of the template 22.

  In the present embodiment, the core molds 13 and 23 are connected between the fixed core mold 13 and the fixed mold 12 and between the movable core mold 23 and the movable mold 22. A support body 30 is provided that is constrained in a direction along the opposing surfaces 11a and 21a and that is slidably supported with respect to the inner peripheral surfaces of the holes 11b and 21b formed in the template plates 12 and 22, respectively. Yes. The support 30 is a sphere made of, for example, stainless steel, and is disposed in a groove 31 formed on the inner peripheral surface of the holes 11b and 21b of the mold plates 12 and 22. The grooves 31 are formed on the inner peripheral surfaces of the holes 11 b and 21 b that are square in plan view, that is, on the three inner surfaces of the four inner surfaces that define the holes 11 b and 21 b. The diameter is larger than the depth of the groove 31, and the outer peripheral surface of each of the core molds 13, 23, that is, three of the four outer surfaces (side surfaces) are supported by the outer peripheral surface of the support 30 protruding from the groove 31. It has a configuration. Accordingly, each of the core molds 13 and 23 is supported by the support 30 from the three outer surface sides, and the remaining one outer surface is pressed against the inner surfaces of the holes 11b and 21b facing the cores 13 and 23. It is the structure positioned in the direction along the surface of the surfaces 11a and 21a. The length in the mold opening / closing direction of the groove 31 formed on the inner peripheral surface of the hole 21b of the movable side mold plate 22 is 0.5 times or more of the forward movement amount at the time of final mold clamping described later. desirable.

A method of manufacturing an injection molded product by the injection compression molding die apparatus 1 configured as described above will be described.
First, the movable mold 21 is moved forward toward the fixed mold 11, and the guide pins 24 of the movable mold 21 are brought into sliding contact with the inner peripheral surface of the guide hole 14 of the fixed mold 11, so that each of the fixed mold 11 and the movable mold 21 is brought into contact. After correcting the slight positional deviation in the direction along the facing surfaces 11a and 21a, the outer peripheral surface of the peripheral portion of the fixed-side core mold 13 is slidably contacted with the inner peripheral surface of the hole 21b of the movable-side mold plate 22. Then, the movable side cavity forming part 23a is caused to enter the fixed side cavity forming part 13a.

  Here, when the outer peripheral surface of the fixed-side core mold 13 is in sliding contact with the inner peripheral surface of the hole 21b of the movable-side mold plate 22, there is a fixed-side cavity forming portion between the fixed mold 11 and the movable mold 21. A cavity C defined by 13a, the movable-side cavity forming portion 23a, and the inner peripheral surface of the hole 21b of the movable-side mold plate 22 is cut off from the outside. Further, substantially simultaneously with this, a gate (not shown) defined by the movable side gate forming portion and the fixed side gate forming portion and communicating with the cavity C is formed.

  Then, after sliding contact between the outer peripheral surface of the fixed-side core mold 13 and the inner peripheral surface of the movable-side mold plate 22, before the final mold-clamping state substantially the same as the outer dimensions of the injection-molded product to be formed, As indicated by a two-dot chain line in FIG. 2, the cavity C, which has a volume larger than the volume of the injection molded product, is inserted through the hot runner of the manifold portion, the injection hole of the stationary side mold plate 12, and the gate. Inject molten resin. Thereafter, the movable mold 21 is further moved forward in the mold clamping direction, and the molten resin is compressed in the mold clamping direction by the fixed side cavity forming portion 13a and the movable side cavity forming portion 23a, and the cavity C is in the final mold clamping state. To. The injection molded product formed as described above has an inner surface formed by the movable side cavity forming portion 23a and an outer surface formed by the fixed side cavity forming portion 13a. Thus, a curved plate-like injection-molded product having a concave curved surface with the other surface along the one surface is formed.

As described above, according to the injection compression molding die apparatus 1 according to the present embodiment, since the support 30 is provided, in the process of manufacturing an injection molded product, the fixed side and movable side core dies 13, 23 are provided. Can be prevented from being displaced in the direction along the opposing surfaces 11a and 21a, the arrangement can be maintained over a long period of time with high accuracy, and the peripheral edge of the fixed-side cavity forming portion 13 is clamped. It can suppress that a part collides with the movable mold | type 21, and these metal mold | dies 11 and 21 are missing.
In addition, since the support 30 supports the core molds 13 and 23 slidably with respect to the inner surfaces of the fixed and movable mold plates 12 and 22, the core molds 13 and 23 are It becomes possible to easily incorporate into each of the template plates 12 and 22, and it is possible to suppress an increase in cost of the device 1 despite the configuration capable of suppressing the defect.

  Further, the support 30 is a sphere disposed in a groove 31 formed on the inner surfaces of the fixed-side and movable-side templates 12 and 22, and the outer diameter of the sphere is larger than the depth of the groove 31. Therefore, the fixed and movable core molds 13 and 23 are restrained by the support 30 in the direction along the facing surfaces 11a and 21a, and are slid with respect to the inner surfaces of the fixed and movable mold plates 12 and 22. It is possible to reliably realize free support.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the configuration in which one cavity C is formed between the fixed mold 11 and the movable mold 21 at the time of mold clamping is not limited to this, but the facing of the core molds 13 and 23 is not limited thereto. A plurality of cavities C may be formed at the time of mold clamping by forming a plurality of cavity forming portions at predetermined intervals on the surfaces 11a and 21a. In this case, in particular, the misalignment of the core dies 13 and 23 is likely to occur, and it is necessary to increase the accuracy of the arrangement.

In addition, when the molten resin is compressed in the mold clamping direction and the cavity C is brought into the final mold clamping state, the entire movable mold 21 is moved in the mold clamping direction. Only the mold 13 may be moved in the mold clamping direction independently of the movable side mold plate 12. In this case, since the support is disposed, it is possible to minimize the sliding resistance during the compression.
Furthermore, in the said embodiment, the structure which has arrange | positioned the support body 30 both between the stationary side core type | mold 13 and the stationary side template 12 and between the movable side core type | mold 23 and the movable side template 22 is comprised. Although shown, either one may be used.

  Moreover, in the said embodiment, although the said flat body like a lens was shown as an injection molded product which has an inner surface and an outer surface, it is not restricted to this, For example, in the hollow rectangular parallelepiped which consists of six surfaces, such as a battery case In other words, the present invention can also be applied to the case where a lid is formed by removing one surface. In this case, the fixed-side cavity forming portion 13a is replaced with the concave curved body, and the peripheral portion is a side surface extending in a direction away from the movable-side cavity forming portion 23a, while the central portion is the opposing surface 11a. A concave body as a bottom surface extending along the movable side cavity forming portion 23a instead of the convex curved surface body, and the peripheral edge portion as a side surface extending toward the fixed side cavity forming portion 13a, What is necessary is just to make it the convex body which makes the said center part the bottom face extended along the said opposing surface 21a.

Furthermore, although the spherical body was shown as the support body 30, for example, a cylindrical body may be used.
Further, the groove portion 31 may be formed on the entire surface of the four inner surfaces defining the holes 11b and 21b, and the support portion 30 may be disposed in all of the groove portions 31.
Further, instead of the guide hole 14 of the fixed mold 11, for example, an oil-free bush may be provided, and the outer peripheral surface of the guide pin 24 may be slidably contacted with the inner peripheral surface of the bush.

  In an injection compression molding apparatus for producing an injection molded product having an inner surface and an outer surface such as a lens and a battery case by compressing and compressing the molten resin injected into the cavity, a core mold having a cavity forming portion, The positional deviation in the direction along each opposing surface can be reliably suppressed, and the arrangement can be maintained with high accuracy.

It is a partial cross section side view of the injection compression molding die apparatus of one Embodiment concerning this invention, Comprising: The 1st process at the time of manufacturing an injection molded product is shown. It is a partial cross section side view of the injection compression molding die apparatus of one Embodiment concerning this invention, Comprising: The 2nd process at the time of manufacturing an injection molded product is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection compression molding die apparatus 11 Fixed mold (1st mold)
11a, 21a Opposing surfaces 11b, 21b Hole 12 Fixed side template (first template)
13 Fixed core type (first core type)
13a Fixed side cavity forming part (first cavity forming part)
21 Movable type (second mold)
22 Movable side template (second template)
23 Movable core type (second core type)
23a Movable side cavity forming part (second cavity forming part)
30 Support 31 Groove C Cavity

Claims (3)

Provided with a first mold and a second mold which are provided so as to be able to approach and separate from each other, and are configured such that a cavity is formed between opposing surfaces when the mold is clamped;
The first mold includes a first mold plate having a hole formed in the facing surface, and a first cavity forming portion that is disposed to be fitted in the hole and constitutes a part of the inner surface of the cavity. The second mold is disposed so as to be fitted into the hole, the second mold having a hole formed in the facing surface, and the inner surface of the cavity. A second core mold having a second cavity forming portion constituting a part thereof,
The peripheral portion of the first cavity forming portion protrudes from the facing surface toward the second mold side, while a central portion in a direction along the facing surface is separated from the second die. It is a concave shape,
The second cavity forming portion is recessed with respect to the facing surface in a direction away from the first mold, and a central portion in the direction along the facing surface is directed toward the first mold side. And a convex shape that is convex,
At the time of mold clamping, the outer peripheral surface of the peripheral edge portion of the first cavity forming portion is brought into sliding contact with the inner peripheral surface of the hole of the second mold plate, and the second cavity forming portion is used as the first cavity forming portion. The cavity is formed by inserting, and
After the molten resin is injected into the cavity, the first and second molds are further moved closer to the clamping direction, and the molten resin is compressed in the clamping direction by the first and second cavity forming portions. ,
An injection compression molding die apparatus for producing an injection molded product in which an outer surface is molded by the first cavity forming portion and an inner surface is molded by the second cavity forming portion,
The first and second core molds are disposed along the facing surface between at least one of the first core mold and the first mold plate and between the second core mold and the second mold plate. An injection compression molding die apparatus characterized in that a support body is provided which is restrained in an inclined direction and is slidably supported with respect to the inner peripheral surfaces of the first and second template plates. The injection compression molding die apparatus according to claim 1,
The support is a spherical body or a cylinder disposed in a groove formed on the inner surfaces of the first and second templates, and the outer diameter thereof is larger than the depth of the groove. Injection compression mold equipment. The injection compression molding die apparatus according to claim 1 or 2,
A plurality of the first and second cavity forming portions are formed in the first and second core molds, and a plurality of cavities are formed between the opposing surfaces when the mold is clamped. Compression molding die equipment.

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