JPS6052322A - Molding of composite article - Google Patents

Abstract

PURPOSE:To simplify the molding by a method wherein one die of a molding machine having a replaceable die to mold a plastic molding body and one half thereof is replaced with one half of the other die to mold an elastic seal material on the seal surface of the molding body. CONSTITUTION:A plastic material such as polyamide and polyacetal is injected into a mold 2a of an oil pan, for instance, from an injection unit 1a of a molding machine at 150-200 deg.C to form a molding body 4. Then, after the mold is opened, with the rotation of a rotary plate 3 by 180 deg., the lower half 2a' thereof is replaced with the lower half 2b' of a mold 2b holding the molding body 4 holding therein 2a'. At the position of replacement, the upper half 2b' for an elastic seal material is put together with the lower half 2a' and after the clampling thereof, a synthetic resin material such as silicon resin, polyurethane is injected onto the seal surface 5 from an injection unit 1b to mold an elastic seal material 6 thereon. Thus, a composite article is obtained. This enables the attaching of the elastic seal material 6 onto the seal surface 5 quickly by the molding operation to ensure strong adhesion thereof integral to the seal surfce 5 regardless of the shape of the surface thereby eliminating waste of material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a method for molding a composite article in which a plastic molded body and an elastic sealing material are integrally molded, and particularly relates to a method for molding a composite article in which a plastic molded body and an elastic sealing material are in close contact with each other. The present invention relates to a method for molding a composite article that maintains advantages such as improved properties and a simple molding process.

[Prior art and its problems]

The composite article according to the present invention refers to a composite body of a plastic molded body and an elastic sealing material, and specifically includes various automobile parts, such as oil pans, head covers, instrument covers, tail lamps, etc., or lids of various containers, Examples include stoppers.

Conventionally, for this type of composite article, the plastic molded body is molded in advance, and then an elastic sealing material is separately molded, and this elastic sealing material is punched into a desired shape, for example, a ring shape. , a method of pasting the ring-shaped elastic sealing material on the sealing surface of the plastic molded body using an adhesive or the like, or applying a liquid gasket on the sealing surface after molding the plastic molded body. However, in the former method, the elastic sealing material is punched out, which results in material loss in the central punched part, which is not only uneconomical, but also uneconomical. The sealing work is troublesome, and the adhesion between the sealing surface of the plastic molded body and the elastic sealing material is insufficient. Especially when the sealing surface is not flat, the adhesion deteriorates significantly, and the latter also occurs. Furthermore, not only is the process of applying liquid gaskets cumbersome, but the surface to be applied lacks surface smoothness, and leakage is likely to occur. The sealing surface and elastic sealing material are integrated even without
A composite material that improves the shortcomings of the above-mentioned known technologies, which provides strong adhesion, a simple molding process, and perfect sealing properties due to the smoothness of the surface of the elastic sealing material, and which does not waste material. The objective is to provide a method for molding articles.

[Key points of the invention]

In order to achieve the above object, according to the present invention, a molding machine equipped with a pair of mutually replaceable molds is used, and one of the molds is used to mold a plastic molded product body having a sealing surface. Then, this plastic molded product main body is replaced with a piece of the mold, and an elastic sealing material is molded on the sealing surface of the plastic molded product main body at the replaced position.

[Specific examples of the invention]

Hereinafter, the present invention will be specifically explained using the accompanying drawings.

FIG. 1 shows an example of a molding machine used in the method of the present invention,
2 shows a perspective view of an oil pan molded using the molding machine shown in FIG. 1, and FIGS. 3(a) to 3(e) are partially enlarged cross-sectional views of part A in FIG. Various forms of resilient seals are shown, and FIGS. 4 and 5 show cross-sectional views of an instrument cover and a container lid, respectively, molded by the method of the present invention.

First, the molding machine shown in FIG. 1 will be explained. This molding machine is equipped with two injection devices, 1a11b1, and a pair of molds 2a and 2b. They are arranged at different positions and can be replaced by each other by rotating this rotary plate 3. First, from the injection device 1a, for example, a mold 2 of an oil pan.
a polyamide (6°6 nylon), polyacetal,
A plastic molded body 4 in the shape of an oil pan is formed by injecting a plastic material such as polycarbonate or ABS resin at a temperature of 15σ to 200°C. 5 is a sealing surface of the plastic molded body.

Next, remove the upper side 2A of the mold 2a to open the mold, and quickly rotate the rotating plate 3 by 18σ to remove the lower side 2A.
This lower side 2a/, which holds the plastic molded product 4 in /, and the lower side 2b' of the other mold 2b are replaced with each other, that is, the lower side 2b is placed in the position of the lower side 2a/ in FIG. ' and 2a% of the lower side are placed at the positions of the lower side 2b', and this state is not shown.

), in this replaced position, the lower side 2a is placed on the upper side 2IA of the elastic material, and the mold is again clamped, and the injection device 1
A synthetic resin sealing material such as silicone resin or polyurethane resin is injected onto the sealing surface 5 from b to mold an elastic sealing material 6 on the sealing surface 5, and the elastic sealing material 6 is formed with the plastic molded body 4 as shown in FIG. 2, for example. A composite article made of the sealing material 6 is obtained. At this time, the lower side of the mold 2b is the injection device la of the company 2b.
Now, this lower side 2b' and upper side 2b'
a" together, clamp the mold, and repeat the same molding operation as described above.

In the present invention, since the elastic sealing material 6 is quickly attached to the sealing surface 5 by a molding operation, the sealing surface 5 does not necessarily have to be flat, and can be integrally formed in any shape. It is possible to mold an elastic sealing material that is tightly adhered and has any shape, and of course it is easy to maintain the surface smoothness of the elastic sealing material, and there is no wastage of material.

Furthermore, in the present invention, molding can be performed quickly with simple operations using a single molding machine, so the molding process is simple.

FIG. 3 shows various forms of the sealing surface 5 of the plastic molded body 4 and the elastic sealing material 6. FIG. 3(a) shows an example in which the elastic sealing material 6 is molded on a flat sealing surface. Third
Figure (b) shows an example in which the elastic sealing material 6 is molded on a sealing surface that partially has a through hole. In this case, the elastic sealing material 6 is completely held on the sealing surface, and there is no fear that it will shift during use. do not have.

FIG. 3(c) shows an example in which the elastic sealing material 6 is molded on a sealing surface having fine irregularities, and in this case, the elasticity and adhesion of the sealing material 6 to the sealing surface are perfect.

FIG. 3(d) shows an example in which the elastic sealing material 6 is molded into a groove on the sealing surface. In this case, the elastic sealing material 6 is completely held within the groove, there is no fear of it shifting during use, and the sealing performance is perfect! be.

FIG. 3(e) shows an example in which the elastic sealing material 6 is molded in two rows on the sealing surface, and the sealing performance is improved.

According to the present invention, the elastic sealing material can be easily molded even if the sealing surface is not necessarily flat as shown in FIGS. 3(a) to 3(e).

Figures 4 and 5 show other examples of composite articles obtained by the method of the invention. FIG. 4 shows an example of an instrument cover.

7 is a frame of the instrument, 4 is an acrylic plastic cover (plastic molded body), and 6 is an elastic sealing material made of silicone rubber.

FIG. 5 shows an example of a container lid. 8 is a container, 4 is a lid body made of acrylic plastic, and 6 is an elastic sealing material made of silicone rubber.

〔Effect of the invention〕

In the present invention, since the elastic sealing material 6 is quickly attached to the sealing surface 5 by a molding operation, the sealing surface 5 does not necessarily have to be flat, and can be integrally formed in any shape. It is possible to mold an elastic sealing material that is tightly adhered and has any shape, and of course, it is easy to maintain the surface smoothness of the elastic sealing material, and there is no waste of material. Furthermore, in the present invention, molding can be performed quickly with simple operations using one molding machine, so the molding process is simple.

[Brief explanation of the drawing]

Figure 1 shows an example of a molding machine used in the present invention;
The figure shows a perspective view of an oil pan molded by the method of the present invention, FIGS. 3(a) to 3(e) show various examples of molding the elastic sealing material onto the cylindrical surface, and FIGS. 4 and 5 show Another example of a composite article molded by the method of the present invention is shown. la, lb... Injection device 2a12b...
... Mold 2a', 2b' - ... Lower side 2a''
%2...Top side 3...Rotating plate, 4...
... Plastic molded body 5 ... Sealing surface, 6 ... Elastic sealing material 7 ... Instrument frame, 8 ... Container patent applicant shares Company Three Bond procedure amendment sound Commissioner of the Patent Office Almost applicable 4 Sako-dono 2゛ 1° 11 years old 4L, 4F Saigen J, ρ cross 1 beggar left 3
, Relationship with the case of the person making the amendment Patent applicant Three Pound Co., Ltd. 5, 1456 Hazama-cho, Hachioji-shi, Tokyo Date of amendment order

Claims (1)

[Claims] Using a molding machine equipped with a pair of molds that can be replaced with each other, 1. A plastic molded product body having a sealing surface is molded using either one of the molds, and then this plastic molded product body is placed on one side of the mold. The plastic molded product body is characterized in that one side of the mold and one side of the other mold are replaced with each other while the mold is held in the mold, and an elastic sealing material is molded on the sealing surface of the plastic molded product body at the replaced position. A method for molding composite articles in which elastic sealing material is integrally molded.