A method for improving the dimensional stability of lost foam

Abstract

The invention relates to the field of casting of negative pressure evanescent modes, and particularly relates to a method for improving the size stability of an evanescent mode. According to the method, firstly, mode sample deformations caused in a production process are counted and analyzed, thus two kinds of mode sample deformations are summarized, for the first kind of deformation caused by falling apart of a mode sample cluster of the evanescent mode, a lightgage steel joist for decoration is adopted as a tie bar for fixation; the other kind of deformation is deformation of a key product of the product, a thin steel wire and a clamping block are adopted for hooping the key part of the mode sample in a penetrating manner. The method disclosed by the invention is simple; the problems that the mode sample of the evanescent mode is easy to deform, poor in size stability, and the like existing for a long time can be solved.

Description

technical field [0001] The invention relates to the field of negative pressure lost foam casting, in particular to a method for improving the dimensional stability of the lost foam. Background technique [0002] Through long-term research on negative pressure lost foam casting technology and mold making process, it is found that for medium and large products with complex structures, casting deformation is most likely to occur when using negative pressure lost foam technology. In the early stage, in order to prevent the deformation of the pattern, wooden strips were often used to bond the fixed pattern clusters and the easily deformable parts of the lost foam, so as to fix the pattern and prevent deformation. However, it was found that there were many disadvantages in this scheme. First, after the castings were boxed, the wooden strips bonded to the pattern had been replaced by molten iron, and they were firmly stuck to the castings, which caused great difficulty in cleaning ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of the prior art and provide a simple method that can solve the long-standing problems of easy deformation and poor dimensional stability of the lost pattern pattern, so as to prevent the lost pattern pattern from distorting in the process of handling, flow coating and molding. Damage and deformation, solve the deformation problem of key parts of the pattern, and finally realize the vacuum negative pressure lost foam casting production mode of various products, while reducing the labor intensity of subsequent cleaning, reducing production costs, and ensuring the quality of castings. A way to increase the size of the lost foam method of stability