| 摘要 |
PROBLEM TO BE SOLVED: To improve a surface accuracy of a molding by eliminating shrinkage or cave-in of the surface even if a product is large in thickness or has an aspheric surface by setting a covering thickness to a specific range in the steps of injecting the same resin as that of a molded molding onto the molded molding to cover it, and melt integrating the resin with the molded molding to a formed molding. SOLUTION: A molded molding 1 is set in a mold 10, and the same resin as that of the molding 1 is injected from gates 11, 12 into a cavity 13 to cover part of the molding 1. A thickness of the covering resin is set to a range of 1 to 1mm. The reason why is because, if a thickness of the covering resin is less than 1mm, its resin flowing resistance is excessively large and hence the resin is not sufficiently cast to details, while if it exceeds 15mm, a fault such as shrink or void occurs. Thus, no fault occurs on an outer periphery of a final molding, and its surface accuracy becomes excellent. And, a covering thickness formed by the final injection is relatively thinned to perform an object shape in high accuracy. |
