Why is the surface roughness of stainless steel precision casting differen

1. The surface roughness of sand mold casting is the key factor to determine the surface roughness of large and medium-sized stainless steel precision casting parts. It is also related to the surface quality of the profiled plate, sand casting suppression method and suppression process parameters.

2. The surface quality of the casting is based on the columnar crystal structure network as the frame, which is not afraid of fire. The raw materials, additives and water are filled vertically, and then there are porosity of different sizes on the surface after drying and firing, and the metal liquid penetrates the surface pores. Degree is an important reason for the rough surface of castings.

3. After the stainless steel plate is used, the molten metal is poured into the mold and the cooling is slow, the resulting castings have coarse grains, and the grooves between the crystals will make the surface of large and medium-sized stainless steel precision casting parts not smooth.

4. Solve the problem of metamorphic treatment of aluminum alloy, use better heat transfer zircon and other fillers to increase the cooling rate of the casting, make the surface layer of the casting finer, and reduce the surface roughness of the casting.

5. Process parameters such as stainless steel material temperature, molten metal pouring temperature and tension, and vacuum value during pouring are harmful to the surface roughness of the casting, especially the soft pouring temperature has a great influence.

6. The relationship between temperature and molten metal pouring temperature and the surface roughness of stainless steel precision casting process. With the increase of temperature and molten metal pouring temperature, the filling characteristics of molten metal are improved, and the deep level of penetration into the surface porosity is improved. , the surface roughness increases.