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What are the factors of the defects of stainless steel casting size?

Edit:Xiangyang Liqiang Machinery Co., Ltd.UpDate:2020-02-02

Stainless steel castingWhat are the factors of size defects?

Stainless steel casting is a low-cut or no-cut casting process. It is an excellent process technology in the foundry industry, and its application is very wide. So everyone knows what are the factors of the defects of stainless steel casting size?

Factors that cause dimensional defects in stainless steel casting:

1. The influence of casting structure: a. Casting wall thickness, large shrinkage rate, thin casting wall, small shrinkage rate. b. The free shrinkage rate is large, and the hindered shrinkage rate is small.

2. Influence of casting material: a. The higher the carbon content in the material, the smaller the linear shrinkage rate, and the lower the carbon content, the greater the linear shrinkage rate. b. The casting shrinkage rate of common materials is as follows: casting shrinkage rate K=(LM-LJ)/LJ×100%, LM is the size of the cavity, and LJ is the size of the casting. K is affected by the following factors: wax mold K1, casting structure K2, alloy type K3, pouring temperature K4.

3. The influence of mould making on the linear shrinkage of castings:

a. The influence of wax injection temperature, wax injection pressure, and pressure holding time on the investment size is the most obvious in the wax injection temperature, followed by the wax injection pressure. The pressure holding time has little effect on the final size of the investment after the investment is formed. .

b. The linear shrinkage rate of wax (mold) material is about 0.9-1.1%.

c. When the investment mold is stored, there will be further shrinkage, and its shrinkage value is about 10% of the total shrinkage, but when stored for 12 hours, the investment mold size is basically stable.

d. The radial shrinkage rate of the wax mold is only 30-40% of the lengthwise shrinkage rate. The wax injection temperature has a far greater influence on the free shrinkage rate than the hindered shrinkage rate (the best wax injection temperature is 57-59℃, The higher the temperature, the greater the shrinkage).

4. The influence of shell-making materials: zircon sand, zircon powder, Shangdian sand and Shangdian powder are used. Because of their small expansion coefficient, only 4.6×10-6/℃, they can be ignored.

The main factors that cause dimensional defects in stainless steel casting are the above. We need to deal with problems in time when our products are out of the box. This is what we all need to do.

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