DURABLE SUCTION FORMING MOLD

摘要

PURPOSE:To obtain a suction forming mold which is provided with strength and durability for mass production and has air permeability over the entire part by forming said mold of a composite sintered body having a hardened layer dispersed with an iron oxide component and backing layer which is uncalcined in the inside. CONSTITUTION:A slurry sample 5 formed by using ferrous powder and ceramic powder as aggregate and mixing a binder contg. a component which evaporates in the process of curing with said aggregate at (1-5):(1-5):1 by weight is cast into a molding flask 6 set therein with a pattern or actual product 4 and is rested for required time. The resulted molding 1' is removed from the flask 6 and is subjected to primary calcination then to secondary calcination under an oxidizing atmosphere condition, by which a composite sintered body is obtd. Such composite sintered body has a dense hardened layer 2 dispersed with an iron oxide component and a backing layer 3 consisting of an uncalcined and mixed structure on the inside of the layer 2. The entire part of the mold consists of a porous construction having 1-50% porosity.