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                                                                Talk about the basic concept of precision casting











Precision casting includes: investment casting, ceramic casting, metal casting, pressure casting, lost foam casting.

 Among them, investment casting is also commonly used, also known as lost wax casting: using a suitable investment material (such as paraffin) to make a melting mold; repeating the refractory coating and blasting sand on the investment mold, hardening shell and drying; Then, the internal melting mold is melted off to obtain a cavity; the fired shell is obtained to obtain sufficient strength, and the residual investment material is burned off; the metal material required for casting is poured; the solidification is cooled, and the sand is removed after shelling, thereby obtaining High precision finished product. Heat treatment and cold working and surface treatment according to product requirements.

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                                                                   Factors affecting the surface roughness of stainless steel castings Surface roughness is another major quality indicator for stainless steel castings , generally less than 3.2 μm, between 0.8 and 3.2 μm. There are many factors affecting the surface roughness of castings, such as the pressure type, the surface quality of the investment and stainless steel, the casting process, the type of alloy and other factors. (1) Profile and investment surface quality. The surface roughness of the investment mold is the most important part affecting the surface roughness of the casting, and it is related to the surface quality of the molding, the compression molding method and the pressing process parameters. (2) Stainless steel surface quality. Stainless steel is a columnar columnar structure network, and refractory materials, additives, and water are filled in the middle, so that there are pores of different sizes on the su
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