JPS59214630A - Split-system manufacture of synthetic resin molded item with core - Google Patents

Abstract

PURPOSE:To obtain the titled item without the deteriorated appearance and with the quality stabilized, by molding one of parts that will be split by a core, securing the one part to the core, and injection molding the remaining part with the core being positioned between the parts. CONSTITUTION:For example, a surface side synthetic resin part 13 of a lever 12 with characters of a door outside panel is molded by double molding with a core omitted, and then after a core 14 is secured to the surface side synthetic resin part 13, an undersurface side synthetic resin part 11 of the lever 12 is injection molded with the core between the parts 13, 11 to obtain the intended item such as the lever 12. The core 14 and the surface side part 13 may be secured by fitting the bosses 17 attached to the surface side part 13 into the holes in the core 14, or in a similar manner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a split-molded synthetic resin part containing a metal core.

FIGS. 1 to 4 show a case in which a split molded composite part containing a metal core is applied to a part of a lever of an outside handle of an automobile door.

FIG. 1 shows an automobile door outer panel 1 and shows the position of a door outside handle 2. As shown in FIG. .

FIG. 2 is a perspective view of the handle 2, where 3 is a cover and 4 is a lever.

FIG. 3 is a sectional view taken along the line xx in FIG. 2, where 5 is the front side of the synthetic Mlti portion of the lever 4, 6 is the core bar of the lever 4, and 7 is the back side of the synthetic resin portion of the lever 4.

FIG. 4 is an exploded view of the lever 40.

Now, everyone knows that when the display part such as letters and the display part are made of different colored materials, double molding can make the surfaces flush and improve the quality of the product.

However, in the case of an automobile door outside handle, which is the subject of the present invention, in which the core metal part is inserted, it is not possible to make the injection port for injecting the molding material come out from the surface part. Since it is not allowed as a product, letters must generally be created by stamping, which may cause problems such as peeling.

In order to solve this problem, K tried to inject the molding material into the core metal in two parts, and since it was necessary to prepare two types of molds for the surface side, it was necessary to inject the molding material later based on the accuracy of the mold for the surface part. There is a drawback that the molding material flows onto the surface of the molded part that was previously injected and molded, resulting in a poor appearance as a product.

In addition, it becomes necessary to scrape off the molding material that has flowed onto the surface of the previously molded part, which increases the number of man-hours required for scraping off and also causes the finished surface to lack smoothness. For this reason, there is also the drawback that the appearance is sacrificed.

The present invention eliminates the above-mentioned drawbacks of the conventional art, and an embodiment of the present invention in which the present invention is applied to an automobile door outside panel with letters is shown in FIGS. 5 to 8.

Figure 5 is a perspective view of the door outside panel, 11 is a cover, 12 is a lever with letters, and Figure 6 is a Y of lever 12.
In the -Y cross-sectional view, 13 is the synthetic grease-resistant part on the front side of the lever 120;
14 is a core metal of the lever 12, and 15 is a composite price finger portion on the back side of the lever 12.

Fig. 7 is an exploded view of the lever 120, with 16 showing the hole drilled in the core bar 14, and Fig. 8 showing the state in which the I5 gold 14 hole is fitted into the boss 17 provided on the back side of the front synthetic wood 13. It shows.

In the present invention, there is one mold on the surface layer side, an injection port is provided on the back side without the core metal 14, and the character part and the front cover part are formed of different materials with different colors by double molding, The double-molded front side synthetic W finger part 13 is applied to the core bar 14, and the front cover part 15 is also formed later by injection molding on the back side located on the back side of the core bar 14. Molded product with display characters wrapped around Gold 14 (Lever 1
2).

In short, in the present invention, the part 13 located on the front side of the core metal 14 is formed independently by double molding without the core metal, and the part 15 located on the back side is later injection-molded with the core metal 14 sandwiched between them. By molding, it is possible to obtain a molded product with a cored metal, so there is an effect that a product of stable quality can be obtained without deteriorating the appearance.

Furthermore, since the boss 17 is thermally caulked to fix the core metal 14 to the front synthetic resin portion 13, (1) the core metal 14 and the front synthetic resin portion 13 are reliably fixed.

(2) Since the load applied to the end portion of the front joint portion 13 is transmitted to the core metal 14 through the boss 17, the load shared by the front synthetic resin portion 13 is reduced, making it difficult to break.

(3) The core metal 14 can be positioned accurately and easily by the boss 17 and the hole 16 of the core metal 14.

As described above, the present invention can eliminate all the conventional drawbacks, and has extremely excellent effects such as improving the quality of the product and ensuring stable quality.

[Brief explanation of drawings]

Figure 1 shows the outer panel of an automobile, Figures 2 to 4 show a conventional door outside handle, and Figure 2 is a perspective view.
Fig. 3 is a sectional view taken along the line X-X in Fig. 2, Fig. 4 is an exploded view of the lever, Figs. Perspective view, No. 6
The figure is a YY sectional view of Figure 5, Figure 7 is an exploded view of the lever,
FIG. 8 shows the state in which the hole is fitted into the boss. 1: Door outer panel 12 Lever 13: Rear side synthetic resin part 14: Core metal 15: Rear side synthetic resin part 16: Hole 17: Boss Utility model registration applicant Wangling Automobile Industry Co., Ltd. (and 1 other person) Agent Patent attorney 1) Shima bone part ゛゛, -11-;-・ 4th @ ♀ 5 Figure

Claims (1)

[Scope of Claims] l- A part consisting of a core metal and a synthetic resin part formed by injection molding surrounding the metal core, and in which the synthetic resin part is separated by the core metal as a boundary; After molding one part (A), the core metal is fixed thereto, and then the remaining synthetic resin part (A) is molded in the injection mold again. Method of manufacturing resin parts. 2. Split molding synthesis according to claim 1, characterized in that a boss provided on the hemicomponent is fitted into a hole drilled in the core metal, and the boss is formed after installation! 111 Method of manufacturing parts.