Forming method of mold for injection molding

Abstract

Abstract PURPOSE:To reduce the production costs of a mold and improve the products in quality by forming a cavity mold body and a cut-out core at the same time and using said core as both the cavity bottom and a knockout. CONSTITUTION:Through a material block 1 of a given shape, a pilot hole 2 is made by using a drill or the like, and an electrode wire 3 of brass or the like is passed through said hole. By electric discharge, the metal texture is cut to bore a hole in the block 1 along a scribed line 4. On completion of boring, the block 1 is divided into a cavity mold body 6 having a tapered hole 5 and cut-out core 7 having a tapered outer surface. Then the inner surface of the hole 5 and the outer surface of the core 7 are ground. The existence of the cut clearance produced between the body 6 and the core 7 allows the core 7 to fall into the hole 5. Said method permits the production costs of the mold to be reduced and improvement in the quality of the products.

Inventors

• 👤 Junichi Takada

Bibliographic Details