JPH0325940Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to molded parts for electronic devices and the like manufactured by so-called outsert molding, in which synthetic resin parts are integrally molded on a metal substrate.

[Technical background and problems of the invention]

Conventionally, molded parts of this type have been shown in FIGS. 4 and 5. FIG. 4b is a cross-sectional view taken along line XX in FIG. 4a. FIG. 5 shows a cross-sectional view of a mold used in manufacturing the molded part shown in FIG. Figure 5a
is a cross-sectional view of the mold along line XX in FIG. 4a, and FIG. 5b is a cross-sectional view of the mold along line Y-Y in FIG. 4a.

In FIGS. 4 and 5, 1 is a metal substrate into which a synthetic resin is injection molded, 2 is an elongated hole formed in the metal substrate 1, 3 is the main body of the molded part molded in the elongated hole 2, and 3a , 3b is a collar portion that allows the main body 3 of the molded part to slide along the elongated hole 2,
The brim portions 3a and 3b are the elongated holes 2 of the metal substrate 1.
It is holding the edges of the

Further, 4 is a burr generated when forming the main body 3 of the molded part, 5 is a fixed mold for forming the molded part, 6 is a movable mold that is located below the fixed mold 5 and is slidable; 7 is a core that prevents the synthetic resin from flowing into the unnecessary part of the elongated hole 2 of the metal substrate 1; 8 is a cavity formed by the molds 5, 6, the core 7, and the metal substrate 1; A molded part is molded by injecting synthetic resin into the mold. 9 is a clearance formed to prevent the metal substrate 1 and the core 7 etc. from colliding with each other.

Next, the manufacturing procedure of the molded part will be explained.

A long hole 2 is formed in a predetermined position of a metal substrate 1. The metal substrate 1 with the elongated hole 2 formed therein is set in a fixed mold 5. After the setting is completed, the movable mold 6 including the core 7 is moved, and the fixed mold 5, the core 7, the metal substrate 1, and the movable mold 6 form a cavity 8. The fractured surface of the metal substrate 1 has very poor surface precision.
It is difficult to arrange the core 7 in contact with the metal substrate 1 because there is a risk that the core 7 will be destroyed due to variations in the fracture surface of the metal substrate 1. At this time, a clearance 9 is formed to avoid collision between the metal substrate 1 and the core 7. In this state, when the synthetic resin is injected into the cavity 8, a portion of it flows up to the clearance 9.

After a certain period of time has elapsed, when the synthetic resin is solidified and molded into a certain shape, the movable mold 6 including the core 7 is retracted to its initial state, and the metal substrate 1 is removed from the fixed mold 5.

The molded part formed in this way is shown in Fig. 4a,
The shape is shown in b.

However, as shown in FIGS. 4a and 4b, some of the synthetic resin injected into the cavity 8 also flows into the clearance 9 formed to prevent collision between the metal substrate 1 and the core 7. , Bali 4
It remains even after molding.

Because of this burr 4, the main body 3 of the molded part is
There was a drawback that it could not slide a predetermined distance when sliding in the direction. Moreover, since the burr 4 is formed along the wall surface of the elongated hole 2 of the metal substrate 1, the task of removing the burr 4 is extremely troublesome.

[Purpose of invention]

The present invention was made to solve the above-mentioned conventional drawbacks, and it is an object of the present invention to provide a molded part that is outsert molded without causing burrs on the synthetic resin body molded on a metal substrate. The purpose is to

[Summary of the idea]

It is a molded part configured so that synthetic resin is injected into the elongated hole of the metal substrate that is not molded in the main body, and unnecessary parts other than the main body are cut after molding. This prevents the occurrence of burrs and allows the main body to slide in a predetermined direction.

[Example of idea]

An embodiment of the present invention will be described based on FIGS. 1 to 3.

FIG. 1a is a perspective view of a molded part, b is a sectional view, and FIG. 2 is a sectional view of a mold for producing the molded part,
a is a cross-sectional view taken along the line X-X in FIG. 3, and b is a cross-sectional view taken along the line Y-Y in FIG. 3. FIG. 3 shows the molded state using the mold shown in FIG. 2.

In addition, in Figures 1 to 3, Figures 4 and 5
Components that are the same as those in FIG. 6 are given the same symbols.

In the figure, 10 is a beam portion connecting the collar portions 3a-3b-3a, 11 is an opening formed between the beam portion 10 and the main body 3, and 12 is a portion for closing the elongated hole 2 of the metal substrate 1. The filling portion is formed by the molds 5 and 6, 13 is a protrusion formed on the upper surface of the filling portion 12, and 14 is a thin wall portion formed at the connecting portion between the filling portion 12 and the main body 3.

Next, the manufacturing procedure of the molded part will be explained.

A long hole is formed at a predetermined position on the metal substrate 1 in the same manner as the conventional long hole 2. A metal substrate 1 with a long hole 2 formed therein is set in a fixed mold 5.

After the setting is completed, the movable mold 6 is moved, and the fixed mold 5, the metal substrate 1, and the movable mold 6 form a cavity 8. At this time, since the main body 3 and filling portion 12 of the molded part are formed in the elongated hole 2, the core 7 unlike the conventional one is not required. Therefore, unlike the conventional example, the clearance 9 for avoiding collision between the metal substrate 1 and the core 7 is not formed.

In the above state, synthetic resin is injected into the cavity 8, and after a certain period of time (after the time for the synthetic resin to solidify), the molds 5 and 6 are separated,
The metal substrate 1 is removed from the fixed mold 5.

The molded part formed in this way is shown in Fig. 3a,
The shape is shown in b. Figure 3b is X- in Figure 3a.
An X cross section is shown.

In the state shown in FIG. 3, the protrusion 13 of the filling part 12 is pressed from the direction of arrow C. Since the filling portion 12 is not formed with the collar portions 3a and 3b, it bends downward with the thin wall portion 14 as the center of rotation.
When pressed with a force greater than the breaking strength of the thin wall portion 14,
The filling portion 12 and the main body 3 are cut at the thin wall portion 14, and the filling portion 12 is removed. As a result, a space is formed in the elongated hole 2, and the main body 3 can be slid.

Flange portions 3a and 3b are integrally formed on the main body 3 so as to sandwich the upper and lower surfaces of the metal substrate 1, and the collar portions 3a-3b-3a are connected by a beam portion 10. The beam portion 10 is formed integrally with the collar portions 3a and 3b, and is formed with the main body 3 via an opening 11 having a certain space.

As a result, as shown in FIG. direction) is possible.

[Effect of idea]

As described above, according to the present invention, the main body is formed to partially block a long hole formed in a metal substrate, and the part of the long hole other than the main body is filled with synthetic resin or the like. Since it is composed of a thin-walled part formed to connect the filled part and the main body, there is no need to provide a core, and there is no need to provide a clearance to avoid collision between the core and the metal substrate. It is possible to prevent the occurrence of burrs.

Furthermore, the present invention has an advantage in that the main body of the molded part is outsert molded so that it can slide smoothly on the metal substrate.

[Brief explanation of the drawing]

Figures 1a and b are views showing one embodiment of the present invention, Figures 2a and b are views showing a cross section of a mold for manufacturing an embodiment of the present invention, and Figure 3a is a view showing the second embodiment of the invention. Fig. b showing a molded part formed by the mold shown in Fig.
4 is a cross-sectional view of a, FIG. 4 is a diagram showing a conventional example, FIG. 4 b is a cross-sectional view of a, and FIGS. be. 2...Elongated hole, 3...Main body, 3a, 3b...Brim part, 12...Filled part, 14...Thin wall part.

Claims (1)

[Claims for Utility Model Registration] An elongated hole formed in a metal substrate, a main body formed as an outsert so as to close a part of the elongated hole, and a part of the elongated hole where the main body is not formed filled. A molded part comprising: a filling part formed to do so; and a thin part forming a connection between the filling part and the main body.