JP4942704B2 - Manufacturing method of synthetic resin molded products - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a synthetic resin molded article which reduces a pressure for injecting a molten synthetic resin and a pressure for clamping a mold, and reduces the occurrence of a trouble relating to an insert member, and a mold device. <P>SOLUTION: In the method for manufacturing a synthetic resin molded article, an insert member 1 is disposed at a movable mold 20 side of a cavity 5 formed between a fixed mold 10 and a movable mold 20, and a molten synthetic resin 2h is injected from the fixed mold 10 side to the cavity 5. The manufacturing method to be employed includes an injection step of injecting the molten synthetic resin 2h into the cavity 5 in such a state that the fixed mold 10 and the movable mold 20 are opened, a first pressurizing step of clamping the fixed mold 10 and the movable mold 20 to pressurize the molten synthetic resin 2h, and a second pressurizing step of feeding a pressurizing material 15 from the fixed mold 10 toward the cavity 5 to pressurize the molten synthetic resin 2h. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for producing a synthetic resin molded product, and more particularly to a method for producing a synthetic resin molded product using insert molding and injection compression molding.

As a method for producing a synthetic resin molded product using insert molding and injection compression molding, for example, a method as disclosed in Patent Document 1 is disclosed.
In the method disclosed in Patent Document 1, first, an already formed insert member is placed in a cavity formed between a fixed mold and a movable mold. Next, in a state where the fixed mold and the moving mold are opened, the molten synthetic resin is injected into the cavity. Finally, it is a method of manufacturing a synthetic resin molded article made of at least two different materials by clamping a fixed mold and a moving mold and pressurizing a molten synthetic resin.
Japanese Patent No. 3700316 (page 4, FIG. 1)

By the way, in the past, when the cavity formed between the fixed mold and the moving mold has a complicated shape, in order to fill the melted synthetic resin up to the end of such a complicated shape It was necessary to increase the pressure for injecting the molten synthetic resin or the pressure due to mold clamping.
However, for example, when a surface treatment layer with low pressure resistance is formed by surface treatment or the like on the surface of the insert member on the side where the molten synthetic resin comes into contact, the pressure or mold for injecting the molten synthetic resin There is a problem that cracks, wrinkles, unevenness, etc. occur in the surface treatment layer by increasing the pressure by tightening.

The present invention has been made in view of such circumstances, and a method for manufacturing a synthetic resin molded article that reduces the pressure caused by injecting a molten synthetic resin and the pressure caused by mold clamping to reduce the occurrence of defects related to insert members. The purpose is to propose.

In order to solve the above problems, the following means are adopted.
The method for producing a synthetic resin molded product according to the present invention includes metal deposition on a surface of a cavity formed between a stationary mold and a moving mold on a side where the molten synthetic resin comes into contact with the moving mold side. A method of manufacturing a synthetic resin molded article in which an insert member that has been subjected to at least one kind of surface treatment of metal plating or coating is disposed, and molten synthetic resin is injected into the cavity from the fixed mold side In the state where the stationary mold and the moving mold are opened, an injection step of injecting a molten synthetic resin into the cavity, and clamping the stationary mold and the moving mold, A first pressurizing step of pressurizing the melted synthetic resin; and a second pressurizing step of feeding the pressurizing material from the fixed mold toward the cavity and pressurizing the melted synthetic resin, In the second pressurizing step Is between the inlet of the stationary mold recess a synthetic resin which is provided on the stationary mold, and characterized by pressurizing the area in the vicinity of the fixed mold recess.

  By adopting such a manufacturing method, in the present invention, it is sufficient that the melted synthetic resin is filled in the cavity by pressurization in the second pressurizing step, and the pressure at which the melted synthetic resin is injected into the cavity. And the pressure by the pressurizing material in the second pressurization step is lower than the pressure in the first pressurization step while the pressure by the mold clamping in the first pressurization step is lower than that in the conventional manufacturing method. The molten synthetic resin can be filled in the entire cavity.

  By adopting such a manufacturing method, in the present invention, a conventional manufacturing method is used for the pressure applied to the surface treatment layer on which at least one of metal deposition, metal plating, or coating of the insert member is made. Can be reduced.

As described above, when the cavity formed between the stationary mold and the moving mold has a complicated shape, in order to fill the melted synthetic resin up to the end of such a complicated shape, It is necessary to increase the pressure for injecting molten synthetic resin or the pressure due to mold clamping. However, since this causes a problem in the surface treatment layer of the insert member, the location where the complicated shape exists ( between the fixed mold recess provided in the fixed mold and the synthetic resin inlet, and A manufacturing method is employed in which a region in the vicinity of the fixed mold recess (hereinafter referred to as a predetermined position ) is pressed in the second pressurizing step.

  By adopting such a manufacturing method, in the present invention, the flow of the molten synthetic resin toward the predetermined position can be efficiently generated as compared with the conventional manufacturing method. Accordingly, the pressure for injecting the molten synthetic resin and the pressure due to mold clamping can be reduced as compared with the conventional manufacturing method, and only the necessary portions in the second pressurizing process are less than the pressure due to mold clamping in the first pressurizing process. By pressing at a low pressure, it is possible to fill the molten synthetic resin up to the end of the complicated shape.

In the present invention, a manufacturing method is adopted in which a protrusion projecting into the cavity is provided on the opposite side of the pressurizing material across the position of the recessed portion of the fixed mold to restrict the flow of the molten synthetic resin.
By adopting such a manufacturing method, in the present invention, it is possible to create a flow of the molten synthetic resin toward a predetermined position.

In the present invention, the pressurizing material employs a manufacturing method in which the fixed mold and the movable mold are moved from the fixed mold toward the cavity in a state where the fixed mold and the movable mold are clamped.
By adopting such a manufacturing method, in the present invention, in the injection step and the first pressurizing step, the pressurizing material is arranged in the fixed mold, and in the second pressurizing step, the pressurizing material is put into the cavity. The volume of the cavity is decreased by moving toward the end, and as a result, pressurization in the second pressurization step can be performed.

In the present invention, a cam structure is provided in which the moving member moves in a direction orthogonal to the moving direction of the moving mold in conjunction with the movement of the moving mold. The manufacturing method of moving toward the vehicle is adopted.
By adopting such a manufacturing method, in the present invention, the pressurizing material can be moved in conjunction with the movement of the moving mold. Further, the pressurizing material can be moved without using an independent driving device.

Moreover, in this invention, the manufacturing method of using a fluid for a pressurization material is employ | adopted.
By adopting such a manufacturing method, in the present invention, the fluid is sent into the cavity, thereby extruding the molten synthetic resin inside the sealed cavity, and as a result, pressurization in the second pressurization step is performed. It can be carried out.

Moreover, in this invention, the manufacturing method of using gas for the said fluid is employ | adopted.
By adopting such a manufacturing method, in the present invention, gas is sent into the cavity, thereby extruding the molten synthetic resin inside the sealed cavity, and as a result, pressurization in the second pressurizing step is performed. It can be carried out.

Further, the present invention employs a manufacturing method in which a second protrusion that protrudes into the cavity is provided on the opposite side of the position of the concave portion of the fixed mold across the fluid inlet, and the flow of the fluid is regulated. .
By adopting such a manufacturing method, in the present invention, the fluid does not flow to the second protrusion side but flows to a predetermined position side. Therefore, the fluid can extrude the molten synthetic resin on the predetermined position side to create a flow of the molten synthetic resin toward the predetermined position.

According to the present invention, the following effects can be obtained.
As described above, according to the present invention, various actions can be obtained. The ultimate purpose of these actions is the pressure applied to the insert member, in particular, the pressure applied to the surface of the insert member on the side where the molten synthetic resin contacts. Is less than that produced by a conventional production method or mold apparatus.
As described above, when the surface of the insert member on the side that is in contact with the molten synthetic resin has been subjected to a surface treatment layer with low pressure resistance, such as metal vapor deposition, metal plating, or painting, by surface treatment, There has been a problem that cracks, wrinkles, unevenness, etc. occur in the surface treatment layer due to the pressure at which molten synthetic resin is injected or the pressure due to mold clamping.

  According to the present invention, the pressure applied to the insert member, in particular, the pressure applied to the surface of the insert member on the side where the molten synthetic resin comes into contact can be reduced as compared with the conventional manufacturing method or the mold apparatus. Therefore, even when a surface treatment layer with low pressure resistance is formed on the surface of the insert member on the side where the melted synthetic resin comes into contact, cracks, wrinkles, unevenness, etc. generated in the surface treatment layer It is possible to reduce the occurrence of defects.

(First embodiment)
Next, an embodiment of the present invention will be described based on the drawings.
FIG. 1 is a side view of a synthetic resin molded product P manufactured using the manufacturing method of the present invention.
As shown in FIG. 1, the synthetic resin molded product P includes an insert member 1 and a synthetic resin material such as ABS (acrylonitrile / butadiene / styrene copolymer synthetic resin) or AES (acrylonitrile / ethylene / styrene copolymer synthetic resin). And a base member 2 formed by The insert member 1 has an insert member main body 1A formed of a synthetic resin material such as polycarbonate, and a surface treatment layer 1B formed of a surface treatment such as metal vapor deposition, metal plating, or painting. ing.

The surface treatment layer 1B is formed on one surface of the insert member body 1A by the surface treatment, and the base member 2 is joined to the surface of the surface treatment layer 1B opposite to the insert member body 1A. On the surface of the base member 2 opposite to the surface treatment layer 1B, a base member recess 2A, a base member protrusion 2B, and a base member second recess 2C are formed.
The base member recess 2 </ b> A is formed on the surface of the base member 2 with two intervals. The base member protrusion 2B is formed outside the base member recess 2A, and the base member second recess 2C is formed outside the base member protrusion 2B.
In the present embodiment, it is assumed that the molding of the insert member main body 1A and the formation of the surface treatment layer 1B have already been completed.

A configuration of a mold apparatus K used for manufacturing the synthetic resin molded product P in the present embodiment will be described with reference to FIGS.
The mold apparatus K includes a fixed mold 10, a fixed mounting plate 19, and a moving mold 20. The fixed mold 10 is connected to a fixed mounting plate 19. By moving the movable mold 20 toward the fixed mold 10, the cavity 5 is formed between the fixed mold 10 and the movable mold 20. In the cavity 5, a molten synthetic resin 2 h that becomes the base member 2 after being cured is injected.

The fixed mold 10 has a sprue bushing hole (not shown) that opens in the cavity 5 and the upper surface of the fixed mold 10 and extends in the mold clamping direction, and a hole that has one end opened in the cavity 5 and extends in the mold clamping direction. 14 and a pressurizing device that is disposed in the hole 14 and pressurizes the molten synthetic resin 2h in the cavity 5 in a clamped state. The fixed mounting plate 19 has a sprue bushing hole (not shown) penetrating in the thickness direction.
The sprue bushing 13 is fitted in the sprue bushing holes of the fixed mold 10 and the fixed mounting plate 19. The sprue bushing 13 has an injection path 11 for injecting molten synthetic resin 2h into the cavity 5, and an injection port (gate) 12 at the tip of the injection path 11 on the moving mold 20 side. ing. The molten synthetic resin 2 h is supplied from the supply device 50 to the injection path 11.
The pressurizing device has a pressurizing material 15 that is movably fitted into the hole 14 and a driving device 16. The driving device 16 reciprocates the pressurizing material 15 along the hole portion 14 between a position that is substantially flush with the surface of the fixed mold 10 and a position that protrudes in the cavity 5.

As shown in FIG. 5, the cavity 5 has a surface facing the movable mold 20 of the fixed mold 10, a fixed mold recess 17 formed on the above surface corresponding to the base member protrusion 2 </ b> B, and the above surface. A fixed mold protrusion (regulating member) 18 formed corresponding to the second concave portion 2C of the base member, a distal end portion of the pressing member 15 on the moving mold 20 side, and a fixed mold 10 of the moving mold 20 And a face to face.
The pressurizing material 15 is disposed in the vicinity of the fixed mold recess 17. The fixed mold protrusion 18 is disposed on the opposite side of the pressurizing material 15 with the fixed mold recess 17 interposed therebetween.

Then, the method to manufacture the synthetic resin molded product P using the metal mold apparatus K in this embodiment is demonstrated.
In this manufacturing method, the insert member 1 is disposed on the movable mold 20 side of the cavity 5 formed between the fixed mold 10 and the movable mold 20, and the synthetic material is melted into the cavity 5 from the fixed mold 10 side. A method of injecting resin 2h to manufacture a synthetic resin molded product P, and injecting molten synthetic resin 2h into cavity 5 with fixed mold 10 and moving mold 20 open; The first pressurizing step in which the fixed mold 10 and the movable mold 20 are clamped to press the molten synthetic resin 2h, and the pressurizing material 15 is sent out from the fixed mold 10 toward the cavity 5, And a second pressurizing step of pressurizing the melted synthetic resin 2h. Hereinafter, each step will be described.

First, the process before the injection process will be described.
First, the insert member 1 is arranged on the movable mold 20 side of the cavity 5 in a state where the fixed mold 10 and the movable mold 20 are opened.
Next, the moving mold 20 is moved until a predetermined interval remains between the moving mold 20 and the fixed mold 10.

The injection process will be described with reference to FIG.
FIG. 2 is a schematic view showing an implantation step in the first embodiment of the present invention.
The molten synthetic resin 2h is poured into the cavity 5 in a state where the fixed mold 10 and the moving mold 20 are opened with the predetermined gap therebetween. The melted synthetic resin 2h is injected through the injection path 11 and the injection port 12 by the operation of the supply device 50, and the injection amount is sufficient to mold the base member 2 after curing. Since only the injection pressure acts on the melted synthetic resin 2h, the end of the cavity 5 is not filled and remains around the injection port 12. Further, the melted synthetic resin 2h is in contact with the surface of the insert member 1 facing the fixed mold 10.

A 1st pressurization process is demonstrated using FIG.
FIG. 3 is a schematic view showing a first pressurizing step in the first embodiment of the present invention.
After the injection of the molten synthetic resin 2h is finished, the fixed mold 10 and the moving mold 20 are clamped, and the molten synthetic resin 2h is pressurized. As a result of the pressurization, the molten synthetic resin 2h is expanded into the cavity 5, but the clamping pressure is reduced as compared with the conventional manufacturing method, so that the end of the cavity 5 is filled. Instead, a space S that is an unfilled portion of the molten synthetic resin 2 h exists at the end of the cavity 5.

A 2nd pressurization process is demonstrated using FIG.4 and FIG.5.
FIG. 4 is a schematic view showing a second pressurizing step in the first embodiment of the present invention. FIG. 5 is an enlarged view of a portion where the molten synthetic resin 2h is pressurized in the second pressurizing step according to the first embodiment of the present invention.
By the operation of the driving device 16, the pressurizing material 15 is fed into the cavity 5 toward the moving mold 20 side. As a result, the volume of the cavity 5 decreases, the molten synthetic resin 2h is further pressurized, and the molten synthetic resin 2h is filled up to the end of the cavity 5.

The pressurizing material 15 pressurizes a specific area in the vicinity of the fixed mold recess 17. Therefore, it is possible to efficiently create a flow toward the fixed mold recess 17 that is a portion that is hardly filled with the molten synthetic resin 2h as compared with the conventional manufacturing method.
In addition, a fixed mold protrusion 18 protruding into the cavity 5 is provided on the opposite side of the pressure member 15 with the fixed mold recess 17 interposed therebetween, thereby restricting the flow of the molten synthetic resin. Therefore, the flow of the molten synthetic resin 2h toward the fixed mold recess 17 can be efficiently created as compared with the conventional manufacturing method.

  When the molten synthetic resin 2h is cured and the base member 2 is molded while the pressurizing material 15 is being fed into the cavity 5, the base member 2 has a recess in the base member due to the shape of the pressurizing material 15. 2A is formed. Similarly, the base member protrusion 2 </ b> B is formed by the shape of the fixed mold recess 17, and the base member second recess 2 </ b> C is formed by the shape of the fixed mold protrusion 18.

Therefore, according to the first embodiment, the following effects can be obtained.
In this embodiment, the melted synthetic resin 2h only needs to be filled in the cavity 5 by pressurization in the second pressurizing step, and the pressure for injecting the melted synthetic resin 2h into the cavity 5 and the first pressurizing step. The pressure in the mold clamping in the process is lower than that in the conventional manufacturing method, and the pressure is lower than the pressure in the first pressurizing process, and the pressure is applied by the pressurizing material 15 in the second pressurizing process. The resin 2h can be filled in the entire cavity 5.

  Moreover, according to this embodiment, since the pressurizing material 15 pressurizes a specific area near the fixed mold recess 17 and the fixed mold protrusion 18 is provided, the molten synthetic resin 2h is provided. A flow toward the fixed mold concave portion 17 that is originally difficult to be filled can be efficiently generated as compared with the conventional manufacturing method. Therefore, the synthetic resin 2h that has been melted to the end of the cavity 5 is pressed by pressing a specific region in the vicinity of the fixed mold recess 17 with the pressure material 15 at a pressure lower than the pressure due to mold clamping in the first pressure step. Can be filled.

  As described above, the surface treatment layer 1B with low pressure resistance is formed on the surface of the insert member 1 on the side where the melted synthetic resin 2h comes into contact by surface treatment such as metal vapor deposition, metal plating or painting. This also has the effect of reducing the occurrence of defects such as cracks, wrinkles and unevenness in the surface treatment layer 1B.

(Second Embodiment)
A mold apparatus K2 according to a second embodiment of the present invention will be described with reference to FIGS. 6 and 7, the same components as those of the first embodiment shown in FIGS. 2 to 5 are denoted by the same reference numerals, and the description thereof is omitted.
The mold apparatus K2 has a cam structure for performing the second pressurizing step. The cam structure includes a moving member 30, a second moving member 31, and a pressurizing material 15.

Two moving members 30 protrude toward the fixed mold 10 at both ends of the moving mold 20 in the direction orthogonal to the mold clamping direction. The moving member 30 is clamped in the mold clamping direction of the moving mold 20. Next, it moves together with the moving mold 20.
A slope 30 </ b> A is formed at the tip of the moving member 30 on the fixed mold 10 side on the side facing the central portion of the fixed mold 10. The inclined surface 30 </ b> A is formed so as to incline toward the outside in a direction that is gradually orthogonal to the fixed mold 10.

 The fixed mold 10 extends in a direction orthogonal to the clamping direction, and has a hole 32 that opens at both ends. The fixed mold 10 is movably fitted in the hole 32, and is provided on two sides sandwiching the pressurizing material 15. Two moving members 31, a second hole 33 having one end opened in the cavity 5 and extending in the mold clamping direction, two pressure members 15 movably fitted in the second hole 33, and a pressure member 15 And a drive device (not shown) for returning from a position protruding in the cavity 5 to a position substantially flush with the surface of the fixed mold 10.

A second inclined surface 31A and a third inclined surface 31B are formed at the end of the second moving member 31 in the direction orthogonal to the mold clamping. The second inclined surface 31 </ b> A has an inclination to be joined to the inclined surface 30 </ b> A, and is formed to incline toward the inner side in the direction orthogonal to the moving mold 20. The third inclined surface 31 </ b> B is formed to be inclined toward the outer side in a direction that is gradually orthogonal to the moving mold 20.
A fourth inclined surface 15A is formed at the tip of the pressure member 15 on the opposite side to the moving mold 20. The fourth inclined surface 15 </ b> A has an inclination to be joined to the third inclined surface 31 </ b> B, and is formed to be inclined toward the outer side in the direction orthogonal to the moving mold 20. The third slope 31B and the fourth slope 15A are always in sliding contact. Further, the pressure member 15 can reciprocate between a position that is substantially flush with the surface of the fixed mold 10 and a position that protrudes in the cavity 5.

  The moving member 30, the second moving member 31, and the pressurizing material 15 are in contact with each other immediately before the injection step, the inclined surface 30A and the second inclined surface 31A are in sliding contact, and the third inclined surface 31B and the fourth inclined surface 15A are in contact with pressure. The material 15 is molded in an appropriate size so as to be disposed at a position substantially flush with the surface of the fixed mold 10 and is disposed at an appropriate position. In addition, the moving member 30, the second moving member 31, and the pressure member 15 are slidably contacted with the inclined surface 30A and the second inclined surface 31A and slidably contacted with the third inclined surface 31B and the fourth inclined surface 15A in the second pressing step. The pressurizing material 15 is formed in an appropriate size so as to be disposed at a position protruding into the cavity 5 and is disposed at an appropriate position.

Then, the manufacturing method of the synthetic resin molded product P in 2nd Embodiment is demonstrated using FIG.6 and FIG.7.
FIG. 6 is a schematic view showing the positional relationship between the fixed mold 10 and the movable mold 20 immediately before entering the injection step in the second embodiment of the present invention.

First, the process before the injection process will be described.
First, the insert member 1 is arranged on the movable mold 20 side of the cavity 5 in a state where the fixed mold 10 and the movable mold 20 are opened.
Next, the moving mold 20 is moved until a predetermined interval remains between the moving mold 20 and the fixed mold 10. At this time, the slope 30A and the second slope 31A are slidably contacted.

  Next, the injection process will be described. Since this process uses the same process as the injection process in the first embodiment, the description thereof will be omitted.

A 1st pressurization process and a 2nd pressurization process are demonstrated using FIG.
FIG. 7 is a schematic view showing a first pressurizing step and a second pressurizing step in the second embodiment of the present invention.
After the injection of the molten synthetic resin 2h is completed, a first pressurizing step is performed in which the fixed mold 10 and the moving mold 20 are clamped to pressurize the molten synthetic resin 2h. At this time, in the present embodiment, since the cam structure for feeding the pressurizing material 15 is provided, the second pressurization by the pressurizing material 15 is performed in conjunction with the movement of the movable mold 20 in the mold clamping direction. A pressurizing step is also performed.

That is, when the moving member 30 moves together with the moving mold 20 toward the fixed mold 10 in the mold clamping direction, the inclined surface 30A and the second inclined surface 31A are in sliding contact with each other, so that the moving member 30 moves toward the fixed mold 10 side. In conjunction with this movement, the second moving member 31 moves to the center side of the fixed mold 10.
Then, since the third inclined surface 31B and the fourth inclined surface 15A are in sliding contact with each other, the pressurizing material 15 moves to the moving mold 20 side in conjunction with the movement of the second moving member 31 toward the center side.
Therefore, the first pressurizing step by clamping the moving mold 20 and the second pressurizing step by moving the pressurizing material 15 toward the moving mold 20 are performed in conjunction with each other. Since the clamping pressure is lower than that in the conventional manufacturing method, the molten synthetic resin 2h is not filled up to the end of the cavity 5 without pressure by the pressurizing material 15. Since the second pressurizing step by the pressure member 15 is also performed in conjunction with the first pressurizing step, the end portion of the cavity 5 is filled with the molten synthetic resin 2h.

Therefore, according to the second embodiment, the following effects can be obtained.
In the second embodiment, the first pressurization step and the second pressurization step are performed at the same time, but the melted synthetic resin 2h is filled in the cavity 5 by the pressurization in the second pressurization step. The configuration of what is necessary is the same as that of the first embodiment. The pressurizing material 15 pressurizes a specific area near the fixed mold recess 17 and the fixed mold protrusion 18 is provided as in the first embodiment.

 Therefore, the pressure of the fixed mold recess 17 is reduced by the pressurizing material 15 while lowering the pressure for injecting the melted synthetic resin 2h into the cavity 5 and the pressure due to the mold clamping in the first pressurizing step as compared with the conventional manufacturing method. By pressing a specific area in the vicinity with a pressure lower than the injection pressure and the clamping pressure in the conventional manufacturing method, the molten synthetic resin 2h can be filled up to the end of the cavity 5.

 As a result, the surface treatment layer 1B having low pressure resistance is formed on the surface of the insert member 1 on the side where the melted synthetic resin 2h comes into contact by surface treatment such as metal vapor deposition, metal plating or painting. This also has the effect of reducing the occurrence of defects such as cracks, wrinkles and unevenness in the surface treatment layer 1B.

  Furthermore, in the second embodiment, a cam structure in which the second moving member 31 moves in a direction orthogonal to the moving direction of the moving mold 20 in conjunction with the movement of the moving mold 20 is provided. The pressurizing material 15 can be moved in conjunction with the movement of 20. Therefore, the pressurizing material 15 can be moved without using an independent driving device, and there is an effect that the device can be reduced in size and cost.

(Third embodiment)
A mold apparatus K3 according to a third embodiment of the present invention will be described with reference to FIG.
FIG. 8 is an enlarged view of a portion where the molten synthetic resin 2h is pressurized in the second pressurizing step according to the third embodiment of the present invention. In this figure, the same components as those of the first embodiment shown in FIGS. 2 to 5 are denoted by the same reference numerals, and the description thereof is omitted.

  In 3rd Embodiment, the gas 42 which is a fluid is used as a pressurization material. The gas is preferably an inert gas such as nitrogen gas or helium gas. The stationary mold 10 includes a gas injection path 40 for injecting a gas 42 into the cavity 5, a gas injection port 41 at the tip of the gas injection path 40 on the moving mold 20 side, and a gas supply device (not shown). ) And.

In the present embodiment, a fixed mold second protrusion (second restriction member) 43 is formed on the surface of the fixed mold 10 that faces the moving mold 20 that forms the cavity 5.
The fixed mold second protrusion 43 is disposed on the opposite side of the fixed mold recess 17 with the gas injection port 41 interposed therebetween.

  Then, the method to manufacture the synthetic resin molded product P using the metal mold apparatus K3 in 3rd Embodiment is demonstrated. In addition, since the same process as 1st Embodiment is used to the 1st pressurization process among the methods of manufacturing the synthetic resin molded product P, description is abbreviate | omitted.

  In the second pressurizing step, by the operation of the gas supply device, the gas 42 passes through the gas injection path 40 and is sent into the cavity 5 from the gas injection port 41 toward the moving mold 20 side. As a result, the molten synthetic resin 2h inside the cavity 5 is pushed out and moved, the synthetic resin 2h is further pressurized, and the end of the cavity 5 is filled with the molten synthetic resin 2h.

The gas 42 pressurizes a specific area in the vicinity of the fixed mold recess 17. Further, a fixed mold protrusion 18 protruding into the cavity 5 is provided on the opposite side of the gas injection port 41 with the fixed mold recess 17 interposed therebetween to restrict the flow of the molten synthetic resin.
As a result, it is possible to efficiently create a flow toward the fixed mold recess 17 that is a portion that is hardly filled with the molten synthetic resin 2h as compared with the conventional manufacturing method.

  Moreover, since the fixed mold 2nd protrusion part 43 which protrudes in the cavity 5 is provided in the reverse side of the fixed mold recessed part 17 on both sides of the gas injection port 41, and the flow of the gas 42 is controlled, the gas 42 is The flow does not flow to the fixed mold second protrusion 43 side, but flows to the fixed mold concave portion 17 side. Therefore, the gas 42 pushes out the molten synthetic resin 2h on the fixed mold concave portion 17 side, and a flow of the molten synthetic resin 2h toward the fixed mold concave portion 17 can be created.

Therefore, according to the third embodiment, the following effects can be obtained.
In this embodiment, the melted synthetic resin 2h only needs to be filled in the cavity 5 by pressurization in the second pressurizing step, and the pressure for injecting the melted synthetic resin 2h into the cavity 5 and the first pressurizing step. The pressure in mold clamping in the second pressurizing step is pressurized with the gas 42 at a pressure lower than the pressure in the first pressurizing step while lowering the pressure due to mold clamping in the conventional manufacturing method, and the molten synthetic resin 2h Can be filled in the entire cavity 5.

 Further, according to the present embodiment, the gas 42 pressurizes a specific area near the fixed mold recess 17, the fixed mold protrusion 18 is provided, and the fixed mold second protrusion. Since 43 is provided, the flow of the molten synthetic resin 2h toward the fixed mold recess 17 can be efficiently created as compared with the conventional manufacturing method. Therefore, even if the specific region near the fixed mold recess 17 is pressed by the gas 42 at a pressure lower than the pressure due to the mold clamping in the first pressurizing step, the molten synthetic resin 2h is filled up to the end of the cavity 5. Can be made.

 As a result, the surface treatment layer 1B having low pressure resistance is formed on the surface of the insert member 1 on the side where the melted synthetic resin 2h comes into contact by surface treatment such as metal vapor deposition, metal plating or painting. This also has the effect of reducing the occurrence of defects such as cracks, wrinkles and unevenness in the surface treatment layer 1B.

  Note that the operation procedures shown in the above-described embodiment, or the shapes and combinations of the components are examples, and can be variously changed based on process conditions, design requirements, and the like without departing from the gist of the present invention. is there.

  For example, in the above embodiment, the surface treatment layer 1B of the insert member 1 is formed with at least one kind of surface treatment layer of metal vapor deposition, metal plating, or painting. It is not limited to the above, but may be fine processing / fine decoration or other surface treatment layer having low pressure resistance on the surface of the insert member.

  Moreover, in the said embodiment, although ABS and AES are used as a material of the base member 2, you may use another synthetic resin. Moreover, although polycarbonate is used as the material of the insert member main body 1A, other synthetic resins may be used.

  In the first embodiment, the driving device 16 is used to push the pressurizing material 15 toward the movable mold 20, and the driving device 16 may be driven by hydraulic pressure, pneumatic pressure, an electric slider, or the like. Is available.

 In the second embodiment, two pressure members 15 are used, but these may be used as one cylindrical member. In this case, the pressure member 15 has a hole extending in the mold clamping direction and opening on the cavity 5 side and the supply device 50 side, and the sprue bush 13 is movably fitted in the hole.

In the first and second embodiments, the pressure member 15 moves from a position that is substantially the same as the surface of the fixed mold 10 to a position that protrudes in the cavity 5. For example, as shown in FIGS. 9 (a) and 9 (b), from the position where the pressure member 15 is lowered from the surface of the fixed mold 10, the surface of the fixed mold 10 is not limited to the moving method. You may move to a position that is substantially the same.
In addition, when the illustrated moving method is employ | adopted, 2 A of base member recessed parts are not formed in the surface of the base member 2 in the synthetic resin molded product P shown in FIG.

  In the third embodiment, the gas 42 that is a fluid is used as an example of the pressurizing material 15. However, the present invention is not limited to the above gas, and for example, a liquid may be used. .

It is a side view of the synthetic resin molded product P manufactured using the manufacturing method in this invention. It is the schematic which shows the injection | pouring process in the 1st Embodiment of this invention. It is the schematic which shows the 1st pressurization process in the 1st Embodiment of this invention. It is the schematic which shows the 2nd pressurization process in the 1st Embodiment of this invention. It is an enlarged view of the part to which the melted synthetic resin 2h is pressurized in the second pressurizing step in the first embodiment of the present invention. It is the schematic which shows the positional relationship of the fixed metal mold | die 10 and the moving metal mold | die 20 just before entering into the injection | pouring process in the 2nd Embodiment of this invention. It is the schematic which shows the 1st pressurization process and 2nd pressurization process in the 2nd Embodiment of this invention. It is an enlarged view of the part by which the molten synthetic resin 2h is pressurized in the 2nd pressurization process in the 3rd Embodiment of this invention. In the 1st or 2nd embodiment of this invention, it is an enlarged view of the part to which the molten synthetic resin 2h is pressurized, (a) is the pressurization material 15 just before entering a 2nd pressurization process. FIG. 4B is a schematic diagram showing that the surface of the fixed mold 10 is lowered from the surface. FIG. 5B is a second pressurizing step in which the pressure material 15 is moved to a position that is substantially the same as the surface of the fixed mold 10. It is the schematic which shows this.

Explanation of symbols

 P ... Synthetic resin molded product, K ... Mold apparatus in the first embodiment, K2 ... Mold apparatus in the second embodiment, K3 ... Mold apparatus in the third embodiment, 1 ... Insert member, 1B ... Surface treatment layer, 2h. Molten synthetic resin, 5 ... Cavity, 10 ... Fixed mold, 15 ... Pressurizing material, 17 ... Fixed mold recess, 18 ... Fixed mold protrusion (regulating member), 20 ... Moving mold Mold, 30 ... moving member, 31 ... second moving member, 42 ... gas (pressurizing material), 43 ... fixed mold second protrusion (second regulating member)

Claims (7)

At least one of metal vapor deposition, metal plating, and coating on the surface of the cavity formed between the stationary mold and the movable mold on the side of the movable mold where the molten synthetic resin comes into contact An insert member that has been treated is disposed, and a synthetic resin molded product is manufactured by injecting molten synthetic resin into the cavity from the fixed mold side,
An injection step of injecting a molten synthetic resin into the cavity in a state where the stationary mold and the moving mold are open;
A first pressurizing step of clamping the fixed mold and the movable mold and pressurizing the molten synthetic resin;
A second pressurizing step of feeding a pressurizing material from the fixed mold toward the cavity and pressurizing the molten synthetic resin;
With
In the second pressurizing step, the region between the fixed mold recess provided in the fixed mold and the synthetic resin injection port and in the vicinity of the fixed mold recess is pressed. Manufacturing method of resin molded product. 2. The flow of the molten synthetic resin is regulated by providing a protrusion protruding into the cavity on the opposite side of the pressurizing material with the position of the concave portion of the fixed mold interposed therebetween. Manufacturing method of synthetic resin molded product. 3. The composition according to claim 1, wherein the pressing material moves from the fixed mold toward the cavity in a state where the fixed mold and the movable mold are clamped. Manufacturing method of resin molded product. A cam structure is provided in which a moving member moves in a direction perpendicular to the moving direction of the moving mold in conjunction with the movement of the moving mold, and the pressurizing material is directed toward the cavity by the movement of the moving member. It moves, The manufacturing method of the synthetic resin molded product of Claim 1 or 2 characterized by the above-mentioned. Wherein the pressurized圧材method for producing a synthetic resin molded article according to claim 1 or 2, characterized by using a fluid. The method for producing a synthetic resin molded product according to claim 5 , wherein a gas is used as the fluid. In the second pressurizing step, a second protrusion protruding into the cavity is provided on the opposite side of the position of the concave portion of the fixed mold across the fluid inlet, and the flow of the fluid is restricted. The method for producing a synthetic resin molded product according to claim 5 or 6 , wherein the synthetic resin molded product is produced.

Images