Method for manufacturing casting blank of die for inner containers of household appliances on basis of metal cavity with cold iron structure

Abstract

The invention discloses a method for manufacturing a casting blank of a die for inner containers of household appliances on the basis of a metal cavity with a cold iron structure, and relates to the technical field of aluminum alloy casting. The method includes particular steps of constructing an outer cavity by cold iron blocks on the periphery of a manufactured wood mold in a form following manner; filling gaps among the cold iron blocks by clay sand, tightly filling the corresponding cold iron blocks by clay sand after each local structure is completed, and compacting a sand mould to prevent the cold iron blocks from moving; constructing a sand core of an inner cavity by the same method after the outer cavity is constructed; opening a case to take out the wood mould after the sand core of the inner cavity is manufactured so that a cavity of a casting is formed; drying the cavity of the casting and the sand core consisting of clay sand; preheating the cavity of the casting at the preheating temperature of 200 DEG C before pouring of the cavity of the casting; casting melted aluminum alloy into the cavity of the casting; and opening the case to take out the casting after the cavity of the casting is cooled naturally. The method is mainly used for casting the die for the inner containers of the household appliances, the surface of a casting product produced by the process is high in smoothness and does not have sand holes or pin holes after the surface of the casting product is treated in a follow-up machining process, and accordingly yield of molded inner container products is greatly increased.

Description

Technical field: [0001] The invention relates to the technical field of aluminum alloy casting, in particular to a method for manufacturing a mold blank for an inner tank of a household appliance based on a cold iron structure metal cavity. 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 green 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 eas...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art, and provide a new casting method for manufacturing the inner container mold of household appliances by using the cold iron structure designed as a metal cavity, the purpose of which is to solve the problem of the yield rate of the inner container mold used in sand casting Low, the surface of the mold is prone to various casting defects such as pinholes and shrinkage porosity; at the same time, it avoids the difficulty of process design when designing and manufacturing all-metal molds, the high cost of mold manufacturing, and the difficulty of producing large castings

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