What should we pay attention to in stainless steel investment casting?

Investment casting is also called wax loss casting. Stainless steel investment castings are highly precise, complicated and close to the appearance of the parts in the middle and later stages. They can be directly used without production or very little production and processing. It is an advanced process of near net production. It is a fixed crystal. Some investment castings (forged with templates), such as turbine engine leaves, magnetic tiles, etc.

What are the precautions for sharing investment casting?

1. Because the metal mold and core are non yielding, in order to facilitate the removal of the casting and extraction mold, the forging gradient of the casting should be moderately larger than that of the stainless steel precision casting factory, generally 30% - 50% larger.

2. In order to avoid white iron produced after investment casting, in addition to taking effective measures technically, the thickness must be thin (some materials emphasize that when the thickness is about 15mm, circular arc must be used at the corner of the metal mold casting castings.

3. The thickness of the inner cavity and inner rib of stainless steel precision casting processing should generally be 0.6-0.7 of the thickness of the connecting surface, otherwise, because the inner cavity (rib) is slow to cool, it is most likely to crack at the junction of the inner and outer walls when the casting is retracted.

4. Because the metal mold discharges heat quickly, the relatively small thickness of the precision casting should be larger than that of the sand mold casting, and the small forging of various casting alloys and different sizes should have smaller thickness.

5. When inhibiting the investment mold, select the profiled plate with strong surface finish of the female mold, so the surface finish of the investment mold is relatively high. In addition, the mold shell is made of fire-resistant coating prepared by special heat-resistant adhesive and fire-resistant insulation material and coated on the investment mold. The internal surface of the injection mold in contact with the molten metal has high smoothness. Therefore, the surface finish of investment castings is higher than that of ordinary castings, generally reaching Ra.1.6~3.2 μ m。