Precautions for casting processing plants

The influence of the structure of the casting processing plant. The wall thickness of the casting is large, the shrinkage rate is large, the casting wall is thin, and the shrinkage rate is small; the free shrinkage rate is large, and the shrinkage rate is hindered. The influence of the casting material. The higher the carbon content in the material, the smaller the linear shrinkage, the lower the carbon content, the greater the linear shrinkage; the casting shrinkage of common materials is the casting shrinkage K=(LM-LJ)/LJ×100%, LM For the cavity size, LJ is the casting size, and K is affected by several factors such as the wax pattern K1, the casting structure K2, the alloy type K3, and the casting temperature K4.
The casting processing plant uses the bottom note package as much as possible. The bottom note metal liquid has small heat loss, large indenter, and high pouring speed. The slag floats on the upper surface of the molten metal, and the molten steel is relatively clean. Due to equipment conditions, some requirements are not high or general small and medium machine tool castings can also be subcontracted.

The effect of mold casting in castings on the shrinkage of castings. The effect of wax temperature, wax pressure and dwell time on the size of the investment is the most obvious temperature of the wax, followed by the pressure of the wax, and the pressure retention time has little effect on the final size of the investment after the investment is formed. The linear shrinkage of the (mold) material is about 0.9-1.1%; when the investment mold is stored, the shrinkage is further generated, and the shrinkage value is about 10% of the total shrinkage amount, but after 12 hours of storage, the investment size is substantially stable; The radial shrinkage of the wax mold is only 30-40% of the shrinkage in the longitudinal direction. The effect of the wax temperature on the free shrinkage is far greater than the effect on the shrinkage shrinkage (the optimum wax temperature is 57-59 ° C, the temperature is higher. The higher the shrinkage is).

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