JP2001347537A - Insert component, its molding method, and plastic molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of a necessity of discussing a disposition, a number and a structure or the like or a high processing cost of giving a shape to an insert component or perforating a hole and obtaining a stably good molding due to a warp caused by a contraction of a resin or a float from an insert component at a part not integrated even when the component is integrated with the resin by an anchoring effect of a shape for integrating the component with the resin or filling the resin in a hole part to obtain the anchoring effect by forming a shape part for integrating the component with the resin or perforating the hole and filling the resin therein. SOLUTION: In the insert molding for integrating the insert component with the resin by setting the component to a predetermined position in the mold, injecting and filling the molten resin in the mold, the component is a porous material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to plastic injection molding in which a plastic material is melted, injected and filled in a mold, cooled and solidified in the mold, and a molded product is taken out from the mold. It relates to insert molding in which an insert part is set at a predetermined position in the mold and injection molded, and the insert part and the resin are integrated. In particular, an insert part and an insert for precisely molding such an insert part The present invention relates to a molding method and a plastic molded product produced by the insert molding method.

[0002]

2. Description of the Related Art In plastic injection molding, when the strength of a plastic molded product is improved, or when the temperature of a state in which the plastic molded product is used rises or falls, the plastic molded product is deformed by the influence of heat. In order to suppress expansion and contraction, that is, to reduce the linear expansion coefficient of plastic molded products, insert parts made of metal, ceramic, carbon, etc. are set in the mold and molten resin is placed in the mold. In general, insert molding is performed, in which the molded product is injected into a mold, cooled and solidified in a mold, the insert component and the resin are integrated, and a molded product is removed from the mold.

When performing such insert molding,
Since the coefficient of linear expansion of the material constituting the insert part and the coefficient of linear expansion of the molding resin are significantly different, the molten resin is injected into the mold and integrated with the insert part in the mold. When cooled and solidified in a mold, it is very difficult to integrate the insert component and the resin, for example, the insert component and the resin are easily peeled off or the molded product is cracked.

Therefore, conventionally, a part to be inserted has a shape that becomes an undercut, a hole is formed,
Alternatively, the resin is filled into the portion by roughening the surface or the like, and the insert component and the resin are integrated by the anchor effect.

[0005]

However, in the conventional method as described above, a shape for integrating the insert component and the resin is formed, or a hole is formed by filling the portion with the resin. To get the anchor effect,
It is necessary to consider the arrangement, the number, the structure, and the like, and furthermore, the processing cost such as adding a shape to the insert part and making a hole is increased.

[0006] In addition, in the shape for integrating the insert component and the resin, or in the hole, the resin is filled in the portion, and even if the insert component and the resin can be integrated by the anchor effect generated there. In other parts that are not integrated, warpage occurs due to shrinkage of the resin, or floating occurs with the insert part, and it is difficult to obtain a stable and integrated good molded product.

Further, when the surface is roughened, it is difficult to uniformly fill the roughened portion with the resin, and the integration of the insert component and the resin tends to be insufficient, and a stable and good molded product is obtained. Is difficult to obtain.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the problems in the prior art by easily and reliably forming the insert part and the resin in the insert molding in which the insert part and the resin are integrated by injection molding. The object of the present invention is to provide an insert part, an insert molding method for such an insert part, and a plastic molded article produced by the insert molding method.

[0009]

According to the present invention, in order to achieve the above-mentioned object, an insert part is set at a predetermined position in a mold, and the molten resin is set in the mold. Injection molding and injection molding to integrate the insert component and the resin are characterized in that the insert component is a porous material.

Further, the insert part of the present invention sets the insert part at a predetermined position in a mold, injects and fills a molten resin into the mold, and integrates the insert part with the resin. The molding is characterized in that the insert part, a part of the insert part, or some part is a porous material.

Further, the insert molding method of the present invention comprises:
In the insert molding in which the insert part is set at a predetermined position in the mold, the molten resin is injected and filled in the mold, and the insert part and the resin are integrated, the insert part, or a part of the insert part, Alternatively, using an insert part in which some parts are a porous material, a porous surface of a part of the insert part during insert molding,
Alternatively, a part of the pores of some porous surfaces, or all of the porous surfaces, or some or all of the holes are filled with the injected molten resin, and the molten resin filled in the holes is filled with the molten resin. It is characterized in that it is cooled and solidified to produce an anchor effect between the insert component and the resin, and the insert component and the resin are integrated by the anchor effect.

Further, in the plastic molded article of the present invention, the insert part is set at a predetermined position in a mold,
Injection molding, injecting and filling the molten resin into the mold, and integrating the insert part and the resin, the insert part, or a part of the insert part, or an insert part in which some parts are a porous material When using the insert molding, the injected molten resin is injected into a part of the porous part of the insert part, or some of the porous surfaces, or a part of the holes of all the porous surfaces, or some or all of the holes. The molten resin filled in the holes is cooled and solidified to create an anchor effect between the insert part and the resin, and the insert part and the resin are integrated by the anchor effect. Features.

[0013] The plastic molded article of the present invention is characterized in that the porous material constituting the insert part is a metal.

Further, the plastic molded product of the present invention is characterized in that the porous material constituting the insert part is ceramic.

Furthermore, the plastic molded article of the present invention
The porous material constituting the insert component is a combination of a metal and a ceramic.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the insert part, insert molding method and plastic molded article of the present invention thus constituted, the plastic molded article is formed by insert molding in which the insert part and the resin are integrated by injection molding. Wherein the insert part, or a part or part of the insert part, is a porous material, and the porous material is a metal or a ceramic or a combination of a metal and a ceramic; When insert molding is performed so that molten resin comes into contact with one or all of the holes and the resin fills the holes, an anchor effect is created between the insert part and the resin filled in the holes of the porous material. As a result, the insert part and the resin are made integrally,
The insert part and the resin are easily and reliably integrated, and a stable and good molded product can be obtained.

Therefore, such an insert part, insert molding method and plastic molded article according to the present invention are:
Insert parts that require integration of insert parts and resin by insert molding, such as housings of electronic devices that require strength, ink ejection heads of inkjet recording devices that require a small linear expansion coefficient, and molding methods It can be effectively used in plastic molded products.

Other objects, features and advantages of the present invention will be apparent from the following detailed description of embodiments of the present invention illustrated in the accompanying drawings.

(Embodiment) A plastic molded product to which the present invention is applied will be described. FIG. 1 is a sectional view of a housing of a laser beam printer made by using the insert part of the present invention.

In FIG. 1, reference numeral 1 denotes an insert part. This insert part 1 is composed of two porous material parts and three solid material parts, and the material is SUS304.
It is.

The casing of the laser beam printer is required to be lightweight and strong, and the SUS304 insert part is set at a predetermined position in a mold and is insert-molded to meet the purpose. Was.

However, conventionally, in order to integrate the insert part and the resin, a hole is made in the insert part, the resin is filled in the hole, and the insert part and the resin are integrated by the anchor effect. .

For this reason, the cost of the step of forming a hole is expensive, that the insert part and the resin are not integrated in the part without the hole, and that the resin is thicker only in the part of the hole, so There was a problem that sink marks occurred and the appearance was unfavorable.

Then, the insert part using the porous material of the present invention was set at a predetermined position of a mold so that the porous material portion became a surface integrated with the resin, and insert molding was performed. Thus, the insert part and the resin can be integrated, and the above problem can be solved.

The porous material used here has a pore size of 90 μm.
m, the porosity was 45%, and particularly, the pore diameter was preferably 60 μm or more, and below that, the strength when integrated was insufficient.

FIG. 2 is a photomicrograph of a cross section of a boundary between the insert part and the resin of the laser beam printer casing. Reference numeral 5 denotes a porous material of the insert part, which is made of SUS304. Is a resin, which is polycarbonate, and it can be seen that the resin has entered the insert part.

As described above, according to the present invention, as described above, a porous material is used for the insert part, and insert molding is performed so that the molten resin is filled in the holes, and the anchor effect of the filled resin is obtained. Thereby, the insert part and the resin can be integrated, and a stable and good molded product can be obtained.

[0028]

As described above, according to the present invention,
The insert part according to claim 1, wherein the insert part is set at a predetermined position in the mold, and the molten resin is injected and filled in the mold, and the insert part is integrated with the resin. Since the insert part is a porous material, by using a porous material for the insert part, insert molding so that the hole part is integrated with the resin, thereby integrating the insert part and the resin And a good plastic molded product can be stably obtained.

The insert part according to claim 2 of the present invention sets the insert part at a predetermined position in a mold,
Injection molding and injection of molten resin into the mold, and insert molding to integrate the insert with the resin, the insert, or a part of the insert, or some part is a porous material, so By performing insert molding so that the hole portion is integrated with the resin, the insert component and the resin can be integrated.

In the insert molding method according to a third aspect of the present invention, the insert part is set at a predetermined position in the mold, and the molten resin is injected and filled in the mold to form the insert part and the resin. In the integrated insert molding,
When the insert part, or part of the insert part, or some part of the insert part is made of a porous material, a part of the insert part has a porous surface, or a part of the porous surface, or all of the porous material at the time of insert molding. A part, some, or all of the holes on the surface are filled with the injected molten resin, and the molten resin filled in the holes is cooled and solidified. Since an anchor effect is generated and the insert component and the resin are integrated by the anchor effect, a good plastic molded product can be obtained stably.

According to a fourth aspect of the present invention, in a plastic molding method, an insert part is set at a predetermined position in a mold, a molten resin is injected and filled in the mold, and the insert part and the resin are combined. In the integrated insert molding,
When the insert part, or part of the insert part, or some part of the insert part is made of a porous material, a part of the insert part has a porous surface, or a part of the porous surface, or all the porous surfaces during the insert molding. A part, some, or all of the holes on the surface are filled with the injected molten resin, and the molten resin filled in the holes is cooled and solidified. Since an anchor effect is generated and the insert component and the resin are integrated by the anchor effect, a good integrated plastic molded product can be stably obtained.

In the plastic molded article according to the fifth aspect of the present invention, since the porous material constituting the insert part is a metal, the integrated plastic molded article having high strength or small linear expansion coefficient is provided. The product can be obtained stably.

In the plastic molded article according to the sixth aspect of the present invention, since the porous material constituting the insert part is ceramic, the integrated plastic molded article has high strength or a small linear expansion coefficient. The product can be obtained stably.

In the plastic molded article according to claim 7 of the present invention, since the porous material constituting the insert part is a combination of metal and ceramic, a good plastic molded article having a strong and low linear expansion coefficient is formed. The product can be obtained stably.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional perspective view of a plastic molded product of the present invention.

FIG. 2 is a micrograph of a cross section of a boundary portion between an insert part and a resin of the plastic molded product of the present invention in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insert part 2 Porous material 3 Solid material 4 Resin part of housing 5 Cross section of porous material 6 Cross section of resin

Claims (7)

[Claims] 1. In insert molding in which an insert part is set at a predetermined position in a mold, a molten resin is injected and filled in the mold, and the insert part and the resin are integrated, the insert part is made of a porous material. Insert parts characterized by being a quality material. 2. In insert molding for setting an insert part at a predetermined position in a mold, injecting and filling a molten resin into the mold, and integrating the insert part and the resin, the insert part or An insert part, wherein a part or several parts of the insert part are made of a porous material. 3. In insert molding for setting an insert part at a predetermined position in a mold, injecting and filling a molten resin into the mold, and integrating the insert part and the resin, the insert part or A part of the insert part, or part of the insert part, is made of a porous material, and when the insert is formed, a part of the porous part of the insert part, or some of the porous surface, or all the porous surfaces have pores. A part, some holes, or all holes are filled with injected molten resin, and the molten resin filled in the holes is cooled and solidified to produce an anchor effect between the insert part and the resin. The insert component and the resin are integrated by the anchor effect. 4. In insert molding for setting an insert part at a predetermined position in a mold, injecting and filling a molten resin into the mold, and integrating the insert part with the resin, the insert part or A part of the insert part, or part of the insert part, is made of a porous material, and when the insert is formed, a part of the porous part of the insert part, or some of the porous surface, or all the porous surfaces have pores. A part, some holes, or all holes are filled with injected molten resin, and the molten resin filled in the holes is cooled and solidified to produce an anchor effect between the insert part and the resin. A plastic molded product characterized by being made by integrating an insert part and a resin by its anchor effect. 5. The plastic molded product according to claim 4, wherein the porous material forming the insert part is a metal. 6. The plastic molded product according to claim 4, wherein the porous material forming the insert part is ceramic. 7. The plastic molded product according to claim 4, wherein the porous material forming the insert part is a combination of a metal and a ceramic.