| 摘要 |
PURPOSE:To mold a hollow product required in the strength of its joining area such as a large-sized or medium-sized tank or intake manifold. CONSTITUTION:A pair of half hollow objects having joining areas are molded by primary molding and joined at the joining areas by secondary molding to mold a hollow product. In this molding method, a plurality of filling grooves opened on the side of the joining end parts of the half hollow objects and a plurality of the communication holes communicating with the filling grooves from the outside are formed to the joining areas 10A, 10B of a pair of the half hollow objects A, B in primary molding. A molten resin J is injected into the communication holes and the filling grooves in such a state that the joining end parts of the joining areas 10A, 10B of the half hollow objects A, B are brought into contact with each other to obtain the hollow product. At this time, protruding parts RA, RB... each developing the action of the head of a rivet are formed on the outsides of the joining areas 10A, 10B. |
