| 摘要 |
PROBLEM TO BE SOLVED: To mold a molding base material with high accuracy by preventing falling of an upper die. SOLUTION: A drum mold 35 is composed of first drum mold 37 and a second drum mold 38, and in the first drum mold 37, a guide hole 34 for guiding the insertion of a pair of dies is formed. In the second drum mold 38, abutting surfaces 53, 54 for positioning the interval of a pair of the dies are formed respectively by abutting a pair of the dies. The second drum mold 38 comprises an upper striking member 39 on which one abutting surface 54 of a pair of the abutting surfaces 53, 54 is formed and a lower striking member 40 on which another abutting surface 53 is formed. The lengths A, B in the press direction are determined respectively so that the upper/lower striking members 39, 40 have different linear expansion coefficients respectively and the total shrinkage calculated by adding each shrinkage is made nearly equal to the total shrinkage of the shrinkage of a pair of the dies and the shrinkage of the molding base material. COPYRIGHT: (C)2010,JPO&INPIT |
