A kind of stainless steel precision casting method of airtight mold shell at medium temperature

Abstract

The invention relates to a precise stainless steel casting method of a medium-temperature airtight mold shell. The method comprises the following steps: the mold shell is produced; the mold shell is roasted; molten steel is poured in the roasted mold shell; and a casting product is obtained by cooling after molding through pouring. The method has the following beneficial effects: the energy consumption in mold shell roasting is saved; and the lowest pouring critical temperature of the mold shell in a general casting process is 1050 DEG C, and the pouring temperature of the mold shell in the method is 600-800 DEG C, so that the energy is saved to a greater extent, the workshop temperature is reduced, the working environment is improved, the working passion of workers is improved, and the productivity is improved. A vertical arrangement mode is adopted without considering the exhaust problem of the mold shell; when a horizontal arrangement mode is adopted, air in the mold shell is not totally exhausted to generate the oxidation reaction with the surface of the molten steel to form small spots on the surface of the casting, so that the product quality is badly influenced; and when the vertical arrangement mode is adopted, the problems can be prevented.

Description

technical field [0001] The invention relates to a casting method of stainless steel, in particular to a precision casting method of stainless steel with a medium-temperature airtight mold shell. Background technique [0002] Stainless steel is resistant to air, steam, water and other weak corrosive media or has stainless steel called stainless steel. Because stainless steel is not prone to corrosion, rust or wear, it is one of the strongest of the metal materials used in construction, allowing structural components to permanently maintain the integrity of the engineering design. [0003] At present, there are some common problems in the casting process of stainless steel, such as: high energy consumption, the energy consumption of the stainless steel melting furnace is the energy consumption of melting steel, and the stainless steel material must reach 1600 ° C to melt into a liquid state. In addition, pouring can only be performed when the temperature in the hearth of the ...

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Problems solved by technology

However, because the traditional arrangement method is horizontal arrangement, the molten steel flows without pressure. In the corners of the wax mold of the casting, the molten steel is often unable to be poured fully, resulting in waste products, and the waste rate often reaches about 11%.

At the same time, the horizontal arrangement is not conducive to the discharge of air in the wax mold of the casting, which often results in incomplete air discharge, and the temperature of the mold shell is relatively high. The high temperature can decompose the crystal water of the mold shell material to generate oxygen, and oxidize the surface of the molten steel. There are small pits on the surface of the casting, and serious honeycombs will seriously affect the quality of the product

[0005] In addition, in the production of stainless steel, due to the relatively high requirements of the mold shell on refractory materials, this results in a high cost of production raw materials. Refractory materials require high temperature resistance and good air permeability. At present, the commonly used material is zircon sand (powder), but its price is relatively expensive.

Expensive raw materials greatly increase the cost of castings and reduce the interests of merchants

[0006] The indoor temperature of the casting workshop is mainly affected by the melting furnace and the mold shell roasting furnace. The mold shell roasting furnace has a large furnace body and a long exposure time during operation, which is the main source of high temperature in the workshop. High labor intensity and low work efficiency

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