JPH07156194A - Outsert molding - Google Patents

Abstract

PURPOSE:To obtain an outsert molding of a metal material and a resin material capable of sufficiently conforming with the vertical accuracy. CONSTITUTION:An outsert molding of a metal material and a resin maternal is provided with a substrate 10 made of a metal material. A resin is injected into a resin reservoir 23 from a gate through a runner 31. The resin reservoir 23 provided at the back of a boss molding part 20 is made of a volume space that is rotation ally symmetrical in a flow changing axial direction, i.e., in a vertical direction, with a crossectional shape larger than that of the runner 31 and a bottom face downward of the bottom face of the runner. A restricting means for restricting disturbance of a resin flow of the boss 20 is formed by the resin reservoir part 23. A resin material supplied from the gate through a hole 11 is set to the substrate 10, whereby the boss 20 made of the resin material is integrally mounted on the substrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal material and a resin material, which are molded by injecting a resin material into a space defining a predetermined shape of the mold through a gate provided in the mold. And the outsert molded product.

[0002]

2. Description of the Related Art Conventionally, a main base provided in a video tape recorder is a metal substrate which is processed into a predetermined shape to form a base, and a resin molded product molded on the substrate by an outsert molding method. , A metal part that is caulked and fixed to the substrate, or a metal part that is press-fitted and fixed to a resin molded product formed on the substrate. The outsert molding method is a molding method that has been developed to make pressed parts into resin and is excellent in terms of performance and cost.

Next, the outsert molding method will be described with reference to the drawings. FIG. 4 is a diagram for explaining a conventional outsert molding method. In the outsert molding method,
As shown in FIG. 3, first, a metal substrate 1 serving as a base.
Between the mold (not shown), the mechanism, functional parts,
For example, the pin 2 or the like is formed by a single injection molding and is integrally attached to the substrate 1.

Since the parts formed by the outsert molding method are limited to low-height pins, for example, pins having a height of about 10 mm, bosses, or holders for pressing the substrate, they are specified in advance. It is possible to obtain a part that sufficiently satisfies the vertical accuracy required, and no problems relating to the vertical accuracy occur.

Recently, with the development of resin materials called super engineering plastics such as polyphenylene sulfide (hereinafter referred to as PPS), material restrictions have been lifted, and there has been an increasing demand for resin parts. With the demand for resinification, it has been considered to form parts such as high pins and bosses by the outsert molding method without being limited to low height pins and bosses.

Next, a case of molding a part having a high height, for example, a height of 15 mm or more by the outsert molding method will be described with reference to the drawings. FIG. 4 is a diagram for explaining a case of molding a high-height component by a conventional outsert molding method, and FIG. 5 is a diagram for explaining an example of molding a high-height boss by a conventional outsert molding method. Figure, Figure 6
FIG. 6 is a diagram for explaining another example of forming a boss having a high height by a conventional outsert forming method.

Referring to FIG. 4, in the outsert molding method, a plurality of block parts 5 are molded at substantially the same time by one gate 3 in consideration of the space limitation of the gate and the economical efficiency (mold cost). A side gate method in which a resin material is injected from the lateral direction of each block component 5 through the runner 4 is used.

However, for example, as shown in FIG. 5, when molding a boss 7 having a high height, a runner 8 for injecting a resin material from the side of the pedestal 7a of the boss is provided on the surface of the substrate 1, The resin agent is injected through this runner 8.
The flow of the injected resin agent is directly divided into a flow toward the boss 7 and a flow toward the boss 7 through the holes 1a and 1b for fixing the boss 7 to the substrate 1. Therefore, at the base portion of the boss 7. The flow of the resin materials merges at a certain A portion, and the flow of the resin material becomes a turbulent flow at the A portion of the boss. Therefore, the orientation characteristic of the A portion of the boss 7 is disturbed, and the A of the boss 7 is
There is a difference between the molding shrinkage rate in one part and the molding shrinkage rate in another part.

Further, until the resin injection is completed, the resin material A
Since the resin material passes through the section, the solidification start timing of the resin material is delayed with respect to the solidification start timing of other portions. The difference in the molding shrinkage ratio described above,
The boss 7 inclines in the direction indicated by the arrow B in the figure due to the difference in the solidification start time of the resin material, and it becomes difficult to satisfy the vertical accuracy of the molded product as the height of the boss 7 increases.

On the other hand, as shown in FIG. 6, a runner 8 can be provided on the back surface of the substrate 1, and a resin material can be injected through this runner 8. However, as in the case of the above-described molding, a difference occurs between the molding shrinkage rate of the A portion of the boss 7 and the molding shrinkage rate of the other portion, and the start time of the solidification of the resin material is the solidification start time of the other portion. Be late for. as a result,
The boss 7 tilts in the direction shown by the arrow B in the figure due to the difference in the molding shrinkage ratio and the difference in the start time of the solidification of the resin material, and the boss 7
It becomes difficult to satisfy the vertical accuracy of the molded product as the height of the mold increases.

[0011]

As described above, when molding a component such as a boss having a high height by the conventional outsert molding method, the vertical accuracy of the molded component cannot be sufficiently satisfied.

An object of the present invention is to provide an outsert molded product of a metal material and a resin material which can sufficiently satisfy vertical accuracy.

[0013]

The present invention provides an outsert molding which is formed by injecting a resin material into a space defining a predetermined shape of a mold through a gate provided in the mold. A metal substrate to be fitted into the mold, a resin body integrally formed on the substrate and having a shape defined by the mold, and a gate to the mold. A regulating means for regulating the flow of the resin material added with the reinforcing material injected into the space, and regulating the orientation of the resin material, wherein the regulating means is a portion where the flow direction of the resin material changes. In addition, the resin material injection part has a larger cross-sectional shape than the flow path for guiding the resin material from the gate, and is rotationally symmetric with respect to the center axis of the changed flow direction and has a ratio of the height of the flow path in the axial direction of more than 1. Is provided.

[0014]

In the outsert molded product of the present invention, the regulating means for regulating the disturbance of the flow of the resin material injected from the gate into the space of the mold is provided.

Since the turbulence of the flow of the resin material injected from the gate into the space of the mold is restricted by the restriction means, the flow of the resin material injected into the space of the mold and its direction are uniform. Therefore, it is possible to eliminate the disturbance in the orientation characteristics of the resin material and to make the solidification start time substantially the same throughout. Therefore, it is possible to suppress the vertical tilt due to the disturbance of the orientation characteristics of the resin material and the difference in the solidification start time, and the vertical accuracy can be sufficiently satisfied.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing an embodiment of an outsert molded product of a metal material and a resin material of the present invention.
FIG. 1 is a perspective view of the configuration of the boss molding section as viewed from the back side.
2 (a) is a plan view of the boss as seen from above, FIG. 2 (b).
2 is a sectional view taken along the line CC of FIG. 1, and FIG. 2C is a plan view seen from the back surface. The outsert molded product made of a metal material and a resin material includes a substrate 10 made of a metal material. As shown in FIG. 1, the substrate 10 includes a gate 30, a runner 31, and a hole 11.
A boss 20 made of a resin material obtained by solidifying the resin material supplied via the boss 20 is integrally attached. The height dimension of the boss 20 is 20 mm. The boss 20 has a pedestal 21 for fixing it to the substrate 10. In addition, a plurality of holes 12 that form a molded portion for preventing rotation are provided.

The portion of the pedestal 21 on the surface side of the substrate 10 is shown in FIG.
As shown in (a), it has a substantially triangular planar shape, and the portion of the base 21 on the back surface side of the substrate has a circular planar shape corresponding to the hole 11 as shown in FIG. 2 (c). 23
And has a substantially circular planar shape corresponding to each hole 12. The pedestal 21 is integrally formed with a rising portion 22 that rises substantially vertically to the substrate 10. Rising section 2
2 has a substantially cylindrical shape that extends substantially coaxially with the axis of the hole 11, and the internal space of the rising portion 22 is formed by a hollow mandrel 40.

The pedestal 21 has the effect of suppressing the rotational flow in the shaping step (the step of filling the mold with the fluid), and is arranged in consideration of the strength of the molded portion after solidification. The molding portion 23 on the back surface of the boss has a substantially cylindrical shape formed substantially coaxially with the hole 11, has a cross-sectional shape larger than the cross-section of the runner 31 in the flow direction from the gate, and further has a resin molding. The bottom surface of the portion is formed so as to be located below the bottom portions of the base 21 and the runner 31. This molding part is a pedestal 2
1, and a resin reservoir 23 at the shaping step is formed integrally therewith.

The resin pool 23 constitutes a regulating means for regulating the turbulence of the flow of the resin material. Next, a method of manufacturing an outsert molded product of a metal material and a resin material will be described. First, the substrate 10 having the holes 11 is fitted into a mold (not shown) in advance. Next, the resin material is injected into the mold from the gate 30 formed between the substrate 10 and the inner wall of the mold via the runner 31.

The resin material injected from the flow path is injected into the resin reservoir 23. The resin pool portion 23 has a cross-sectional shape larger than the cross-sectional shape of the flow channel on the back surface of the boss molding portion, and further has a bottom surface at a position below the flow channel bottom portion in rotational symmetry in the axial direction where the flow changes, that is, in the vertical direction. It is formed with a volume space having. At the time of injecting the resin material, the fluid resistance of the fluid is injected into the resin pool 23 formed with low resistance. The flow resistance is determined from the material constant of the resin material, the cross-sectional shape of the flow path, the flow velocity, the pressure, and the like.

A resin pool 23 is provided from the runner 31 in a portion associated with a change in the flow direction so as to make the resin inflow into the inlet portion 11 for resin injection in the vertical direction uniform.

In the resin pool 23, the injected resin flows toward the rising portion 22 after the resin flow becomes uniform in the vertical direction, so that the flow and direction of the resin material are not disturbed, and the resin material is not disturbed. The orientation properties of are not disturbed. Therefore, the molding shrinkage becomes uniform over the whole, and it is possible to suppress the vertical collapse due to the unevenness of the molding shrinkage. As described above, the boss 20 having a high height that sufficiently satisfies the predetermined vertical accuracy can be formed.

In this embodiment, the height dimension is 20 mm.
Although the example of forming the boss is described, the boss having a higher height can be formed so as to satisfy the vertical accuracy.

[0024]

As described above, according to the outsert molded product of the metal material and the resin material of the present invention, the vertical accuracy can be sufficiently satisfied.

[Brief description of drawings]

FIG. 1 is a configuration perspective view showing an embodiment of an outsert molded product of a metal material and a resin material of the present invention.

FIG. 2 is a diagram for explaining the outsert molding method of the present invention.

FIG. 3 is a diagram for explaining a conventional outsert molding method.

FIG. 4 is a diagram for explaining a case where a high component is molded by a conventional outsert molding method.

FIG. 5 is a diagram for explaining an example of forming a boss having a high height by a conventional outsert forming method.

FIG. 6 is a diagram for explaining another example of forming a high boss by a conventional outsert forming method.

[Explanation of symbols]

 10 ... Substrate 11, 12 ... Hole 20 ... Boss 21 ... Pedestal 22 ... Rise 23 ... Resin pool (resin injection part)

Claims (1)

[Claims] 1. An outsert molded product molded by injecting a resin material into a space defining a predetermined shape of a mold through a gate provided in the mold, wherein the mold is a mold. A substrate to be fitted into the substrate, a resin body made of the resin material formed integrally with the substrate and having a shape defined by the mold, and a reinforcement material added from the gate into the space of the mold. A regulating means for regulating the flow of the resin material and regulating the orientation of the resin material, wherein the regulating means guides the resin material from the gate to a portion where the flow direction of the resin material changes. An outsert having a cross-sectional shape larger than that of the flow path, and comprising a resin material injection portion that is rotationally symmetric with respect to the center axis of the changed flow direction and has a ratio of the height of the flow path in the axial direction that is greater than one. Molding.