Investment mold precision casting valve body

How should everyone avoid the disadvantages of metal precision casting?

1. Pinhole

Avoid precision casting contaminated aluminum alloy casting materials, organic matter and severely oxidized materials. Strengthen de-gassing refining and control the smelting process. Control the thickness of metal plating, too thick easy to produce small holes. Casting thick-walled position should use copper inlay or pouring and other cooling measures, mold temperature should not be too high. In the use of sand mold, to strictly control the water, try to use dry core.

2.Gas hole

Improve the pouring and riser system to make the liquid flow smoothly and prevent gas entrapment in the fusion mold precision casting of agricultural machinery. Moulds and dies should be preheated and then coated, and must be baked before use. Take sufficient exhaust measures to design the mold and core.

3.Loosening

To ensure condensation and shrinkage capacity, measures to avoid loose production of investment mold precision casting joints: reasonable setting of risers. The working temperature of the metal mold is moderately reduced. Control the thickness of the coating, thick walls become thinner. Make the thick wall of the casting with greater cooling capacity and adjust the cooling speed of each part of the metal mold. The metal pouring temperature is moderately reduced.