MANUFACTURE OF MOLD WITH ELECTROFORMED CAVITY

摘要

PURPOSE:To prevent the deterioration of dimensional accuracy due to thermal deformation of a cavity and improve the strength and dimensional accuracy of a mold by a method wherein fasteners such as bolt, nut or the like are threadingly inserted via through holes, which are made on the mold, in the screw parts of connects, which are fixed to the cavity. CONSTITUTION:A cavity 3, which has finished the recess 1 of a mold 10 by electric discharge machining, is released from a matrix 2 after electric discharge machining and, after that, fitted into the recess 11 of the mold 10. Bolts 13 as fastener are threadingly inserted via through holes 12 to the female screw parts of connectors 5 so as to fix the cavity 3 to the mold 10. The pawl 14a of each press member 14, which is fixed to the mold 10 with a bolt 15, is urged to the engaging groove 16 of the cavity 3 in order to fix the cavity to the mold. In addition, in order to assist the fixation of the cavity 3 with the bolts 13, the press member 14 is fitted into recesses 17, which are made on the surface of the mold 10, so as not to project beyond a parting line.