DUAL STRUCTURE METALLIC MOLD HAVING CORE CONSISTING OF A PLURALITY OF SUB-CORE EMBEDDED IN CENTER AREA OF DIE

摘要

Mold according to the present invention includes mold by the first metal material and core. Multiple pair cores, the core include that form punch-center than the through-hole that there is the first material the coefficient of elasticity of hardness to be formed than a part that the first material includes slot containing the second material be mold by being joined to core combined hole. Multiple pair cores are separated to be many as distance according to the power applied based on coefficient of elasticity, pass through punching press through-hole by punching press and metal plate. In addition, multiple pair cores are reduced to original coupled state according to coefficient of elasticity mold when formed punch and metal plate and punching press through-hole, crackle is prevented. ;The 2016 of copyright KIPO submissions