Precision-investment casting method

Abstract

The invention provides a method for casting a fusible pattern precisely, which comprises the following steps: manufacturing a wax pattern in accordance with a cast product, wherein the wax pattern comprises a casting head and a core print corresponding to structures of an internal chill or an external chill; manufacturing a silicasol fusible pattern according to the wax pattern, and performing dewaxing and solidifying processes to obtain a shuttering which contains a reserved opening corresponding to the core print; placing the external chill or the internal chill which is designed well according to a dispersed thermal centre of the cast product into the shuttering from the reserved opening; pouring molten metal into a die cavity in the shuttering to obtain the cast product; cutting and separating the casting head of the cast product after the mould is opened, and removing the external chill or finishing a protruding part of the internal chill to obtain the finished product. The method is applicable in the field of casting high-precision parts.

Description

technical field [0001] The invention relates to a metal casting method, in particular to an investment precision casting method. Background technique [0002] The Chinese patent CN101138781A announced on March 12, 2008 discloses an investment casting mold shell and its manufacturing method. The sand-sprinkling material between coatings, the refractory coating of the reinforcement layer includes silica lime powder, which can increase the strength of investment casting formwork, reduce the number of coating layers for formwork manufacturing and reduce the number of iron wires tied. It can be seen that it is a known technology to obtain castings by investment casting, but for parts with multiple dispersed heat nodes, due to the cooling shrinkage of the cast material and the small wall thickness between adjacent heat nodes of the casting itself As a result, the filling of the casting liquid is not sufficient, and the inner structure of the casting produced is poor, the structur...

AI Technical Summary

Problems solved by technology

It can be seen that it is a known technology to obtain castings by investment casting, but for parts with multiple dispersed heat nodes, due to the cooling shrinkage of the cast material and the small wall thickness between adjacent heat nodes of the casting itself As a result, the filling of the casting liquid is insufficient, and the internal structure of the casting produced is poor, the structural strength is uneven, and the pressure bearing capacity is poor.

If the number of risers is increased on the investment casting mold shell, it will lead to a large amount of subsequent processing and increase energy consumption

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