How to control the shrinkage rate of precision casting

The shrinkage rate of precision casting is mainly caused by the volume change during the solidification process. To control the shrinkage rate of precision casting, you need to pay attention to the following points:

1. Reasonably design the mold: The mold design should be reasonable, taking into account the shrinkage rate of the material, and leaving a certain shrinkage margin. At the same time, excessive angle and wall thickness changes should be avoided to reduce the impact of shrinkage rate.

2. Control the pouring temperature: The pouring temperature also has a great influence on the shrinkage rate. The pouring temperature should be reasonably set according to the characteristics of different materials to achieve the shrinkage rate control effect.

3. Choose the appropriate cooling method: Different materials require different cooling methods. Choosing the appropriate cooling method can reduce the impact of shrinkage.

4. Precisely control the pouring time: The pouring time also has a great influence on the shrinkage rate. Too long or too short will cause the shrinkage rate to change. The pouring time should be controlled according to the specific situation to achieve the shrinkage rate control effect.

5. Use heat treatment technology: After investment casting, the shrinkage rate can be further controlled by using appropriate heat treatment technology, such as aging treatment, annealing, etc.

The above are some methods to control the shrinkage rate of precision casting, which need to be adjusted and optimized according to specific conditions.