Factors affecting the accuracy of stainless steel castings

Date:14-09-2018

In the process of production, Stainless Steel Casting Parts will encounter the wrong size, which affects the precision of stainless steel castings:

The structure of the casting: the wall thickness of the casting, the shrinkage rate is large, the casting wall is thin, the shrinkage rate is small, the free shrinkage rate is large, and the shrinkage rate is hindered.

Sshell material: stainless steel castings using zircon sand, zircon powder, Shangdian sand, Shangdian powder, because of its small expansion coefficient, only 4.6 × 10-6 / ° C.Roasting of the shell: Since the expansion coefficient of the stainless steel casting shell is small, when the shell temperature is 1150 ° C, it is only 0.053%.

Stainless steel casting casting temperature: the higher the casting temperature, the greater the shrinkage rate, the lower casting temperature, the smaller the shrinkage, so the pouring temperature should be appropriate.

Casting material: the higher the carbon content of the material, the smaller the shrinkage rate of stainless steel castings, the lower the carbon content, the greater the shrinkage rate of stainless steel castings.

Molding on the line shrinkage rate of the casting: the effect of the wax temperature, the wax pressure and the dwell time on the size of the investment mold is the most obvious at the wax temperature, followed by the wax pressure, and the dwell time is guaranteed after the investment molding. The final size of the investment has little effect and the linear shrinkage of the wax is about 0.9-1.1%.