JP2006110924A - Resin molding inserted with metal plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance, in a resin molding formed by injection-molding a resin using a metal plate as an insert and covering part of both surfaces of the metal plate with the resin, adhesion between the metal plate and the resin. <P>SOLUTION: In the resin molding formed by injection-molding the resin using the metal plate 1 as an insert and covering part of both surfaces of the metal plate 1 with the resin 2, the metal plate 1 is provided with a through-hole 4 at the part corresponding to where the weld generates at the time of injection molding. At the time of injection molding the through-hole 4 is filled with the resin to form the structure wherein the resin 2 covering the metal plate 1 from both surfaces is jointed at the through-hole 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resin molded product having a structure in which a resin is injection molded using a metal plate as an insert, and a part of both surfaces of the metal plate is covered with resin.

As the resin molded product, there is one in which a metal plate bent into an L-shaped cross section is used as an insert. For example, as shown in FIG. 2, the outer bottom surface and part of the rising surface of the metal plate 1 having an L-shaped cross section and a part of the inner rising surface are covered with a resin 2. (For example, Patent Document 1 discloses a similar structure)
Japanese Patent No. 3339300

In the above resin molded product, the adhesion between the metal plate and the resin covering the metal plate may not be sufficient. In such a case, if one end of the metal plate exposed from the resin molded product is in contact with the fluid material, the fluid material enters the interface between the metal plate and the resin and reaches the other end of the metal plate. There was a crawling up.
The problem to be solved by the present invention is to improve the adhesion between a metal plate and a resin in a resin molded product in which a resin is injection-molded using a metal plate as an insert and a part of both surfaces of the metal plate is covered with resin. is there.

  In order to solve the above-described problems, the metal plate insert resin molded product according to the present invention is intended for a configuration in which a resin is injection-molded using a metal plate as an insert, and a part of both surfaces of the metal plate is covered with resin. In such a configuration, the resin is filled in the through hole provided in the metal plate so as to coincide with the place where the weld occurs at the time of injection molding, and the resin that covers the metal plate from both sides is connected in the through hole. And

  When the adhesiveness between the metal plate as the insert and the injection-molded resin was examined, it was found that the adhesiveness was particularly bad at the place where the weld occurred. It is assumed that the flow of injected resin is disturbed at the place where welds occur, and as a result, the shrinkage rate of the resin during cooling is not uniform and the adhesion between the metal plate and the resin is insufficient. Is done.

  In the present invention, a through hole is provided in the metal plate so as to coincide with the place where the weld is generated, and the resin on both sides covering the metal plate is connected in the through hole by the resin filled therein. Therefore, when the resin shrinks, the resin on both sides that covers the metal plate is strongly attracted to the metal plate by the resin filled in the through hole, and the weld occurrence location where the shrinkage during cooling of the resin becomes uneven Good adhesion can be ensured.

Example As shown in FIGS. 1 and 2, polyphenylene sulfide (PPS) was injection-molded using an L-shaped metal plate 1 (copper terminal) as an insert. This is a resin molded product having a structure in which the outer surface bottom and part of the rising part and part of the inner surface rising part of the L-shaped metal plate 1 are covered with the resin 2. As shown in FIG. 1, the gate position 3 for injecting the resin is the bottom surface of the outer surface of the metal plate 1 having an L-shaped cross section, and is provided at two locations on both ends in the width direction. In this case, a weld is generated at the center in the width direction of the rising portion of the metal plate 1.

  Corresponding to this weld occurrence location, a through-hole 4 of Φ2 mm is made in the metal plate 1, and the resin 2 on both sides covering the metal plate 1 is connected with the resin filled in the through-hole 4. The thickness of the metal plate 1 was 1 mm, and the thickness of the resin 2 covering the metal plate 1 was 2 mm.

Comparative Example In the above example, the through hole 4 ′ was provided at a position where it was removed from the weld generation location (moved to the side by a dimension of 1/4 of the width direction dimension from the center), and the others were the same as in the example.

Conventional Example In the example, the structure is such that no through hole is provided.

About the resin molded product of the said Example, a comparative example, and a prior art example, the adhesiveness of a metal plate and resin was evaluated as follows.
One end of the exposed metal plate was brought into contact with the viscous fluid and allowed to stand at room temperature for 24 hours, and the presence or absence of creeping of the viscous fluid to the other end of the metal plate was visually confirmed. The results are shown in Table 1.

  From the comparison of the above examples, it can be understood that there is an effect of improving the adhesion only when a through hole is provided in the metal plate so as to correspond to the weld occurrence location.

It is a front view of the insert part of a metal plate insert resin molded product. It is sectional drawing which follows the A-A 'line of FIG.

Explanation of symbols

1: Metal plate 2: Resin 3: Gate position 4: Through hole 4 ': Through hole

Claims (1)

A resin molded product in which resin is injection molded using a metal plate as an insert, and part of both sides of the metal plate is covered with resin,
A metal plate insert resin characterized in that a resin is filled in a through hole provided in a metal plate so as to coincide with a place where a weld occurs during injection molding, and a resin covering the metal plate from both sides is connected in the through hole. Molding.

Images