Investment mold precision casting process

Mold production on the casting line shrinkage rate: a. Waxing temperature, waxing pressure, holding time on the molten mold specifications, followed by the waxing pressure. The holding time has little effect on the specifications of mining machinery molten die precision casting after molten die molding. b. The line shrinkage rate of wax (die) material is about 0.9-1.1%. c. When the molten die is stored, the shrinkage value is about 10% of the total shrinkage, which will produce further shrinkage, but the molten die specifications are basically stable after 12 hours of storage. d. The axial shrinkage rate of the wax die is only 30-40% of the shrinkage rate of the long orientation, and the injection wax temperature on random shrinkage rate is much greater than the impact of the shrinkage rate of the encounter (injection wax temperature as much as possible is 57-59) ℃, the more shrinkage the greater the temperature).

The influence of shell material:Because of its small expansion coefficient, zirconium ore, zirconium quartz powder, store sand, store powder selection is only 4.6×10-6/℃, so it can be ignored.

The impact of baking of investment mold precision casting furnace plate shell: When the shell temperature is 11500, due to the small expansion coefficient of the shell ℃, only 0. So it can also be ignored 053%.