| 摘要 |
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. |
