THE MANUFACTURING METHOD OF SPRAY FORMED METAL TOOLS BY A BACK-FILLING

摘要

A back-filling apparatus of spray formed metal tools and a back-filling method using the same are provided to improve compressive strength by mixing a back-filling material and injecting the mixed back-filling material into a jig in a vacuum atmosphere, thereby preventing bubbles from forming in a back-filling layer. A manufacturing method of a spray formed metal tool by back-filling that fills a backside of a thermal spray coating layer(160) comprises the steps of: coating a thermal spray pattern with the thermal spray coating layer; separating the thermal spray pattern and the thermal spray coating layer; preparing a jig(150) within a vacuum chamber to fix the thermal spray coating layer such that the thermal spray coating layer is back-filled; mixing a back-filling material(115) that is any one selected from an epoxy resin, a mixture of the epoxy resin and a metal powder, and a metallic material; mixing an epoxy hardening material with the mixed back-filling material; injecting the mixed back-filling material into an injection case(110) which adjusts a discharge quantity of the back-filling material by an adjusting valve(120), and freely dropping the injected back-filling material into a vacuum chamber(130) in a vacuum state by a vacuum pump(140) such that the back-filling material is injected onto a backside of the thermal spray coating layer fixed by the jig; hardening the back-filling material stacked on the backside of the thermal spray coating layer; separating a back-filled spray formed metal tool from the jig; cutting the spray formed metal tool to mount the spray formed metal tool on an injection machine or a press machine; and subjecting the spray formed metal tool to heat treatment at a predetermined temperature.