Patent ID: 9545736
Date: 2017-01-17
CPC Classifications: B22D,B22F,B29C,C22C

Claim:
1. An air-permeable member for mold and die use obtained by EDM, etching, or machining of the mold and die metallic material, the mold and die metallic material being made by forming a mixed material containing stainless steel fibers with an equivalent diameter of 30-300 μm and a length of 0.4-5.0 mm, and stainless steel powder, heat sintering a green body of the mixed material, and heating the sintered body thus obtained in a nitrogen atmosphere and nitrided, the air-permeable member comprising: open pores whose average open pore diameter is 3-50 μm; a plurality of drilled conducting holes each formed straight through an interior of the air-permeable member and each having inlet and outlet openings opened, respectively, in opposite sides of the air-permeable member, wherein the conducting holes have a diameter of 5-20 mm; a hardening agent added epoxy resin having a viscosity of 200 mPa·s-20000 mPa·s and applied over inner surfaces of the conducting holes; and a connecting pipe configured to connect the outlet of a conducting hole to the inlet of an adjacent conducting hole so that cooling water can flow through the conducting holes and the connecting pipes to maintain the air-permeable member at a fixed temperature, wherein the air-permeable member cleaned out by air blowing has an air permeability of 50 cm