The metal mold process of casting refrigerator liner mold casting billet based on v-method

Abstract

The invention discloses a metal-type process of a casting blank for a refrigerator inner liner mold on the basis of V-process casting, and relates to a new process adopting a vacuum casting process as the basis and combing the characteristics of marketing products. The metal-type process aims at solving the problems that the finished-product rate of the mold of the inner liner cast by using a sand mold is low, and various casting defects, such as needle holes and shrinkage, are easy to generate on the surface of the mold; simultaneously, the problems of large difficulty of process design in designing and manufacturing all-metal type, high mold-manufacturing cost and difficulty in producing large casting pieces are avoided.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a metal mold process for casting refrigerator liner mold blanks based on the V method. Background technique [0002] Home appliance liner mold is a kind of vacuum plastic forming mold, and the product has high requirements on the smoothness of the molding surface of the mold. The quality of the molding surface of the mold directly affects the surface quality and yield of the inner tank after forming. Therefore, for the inner tank molding mold, the roughness of the molding surface should not be greater than Ra=0.8μm, and the surface should be flat, smooth, free of blisters and pores. . [0003] At present, the sand casting process is generally used to cast home appliance inner tank molds. However, for inner tank molds with large outlines, complex inner cavity structures, and cooling water pipes, the cavity is not easy to trim and easy to collapse when using full sand casting. ....

AI Technical Summary

Problems solved by technology

At the same time, shrinkage cavities and pores are prone to appear in casting products, and trachoma and sticky sand are prone to occur on the surface of castings, so the yield of inner tank molds with sand casting is low

[0004] In order to refine the coarse grain structure inside the casting and eliminate the casting defects on the surface of the casting, the all-metal casting process can be used to cast the mold, but the manufacturing cost of the full-metal mold is high, the production preparation period is long, and the processing of the metal mold is time-consuming and laborious. It is relatively difficult to produce large-scale castings. difficulty

Metal mold casting is especially suitable for large batches and small and medium-sized castings, while inner tank molds are generally produced in a single piece, without batch parts, and the castings are large in size, so using metal molds to produce molds can meet the mold surface quality requirements, but the production cost high, long period

In terms of economic cost and technical difficulty, the all-metal process is not suitable for the manufacture of liner mold blanks