What is vacuum casting（4）

3. Vacuum die casting

Vacuum differential pressure casting, mainly the resistance of the furnace and the mold are all sealed. In the seal, the compressed air enters the compressed air through a larger pressure such as 500kPa, and then the internal pressure of the mold and the crucible is equal, the metal will not rise, and then added on the metal surface At a pressure of 50kPa, the metal liquid will rise to fill the mold cavity. Especially for the production of complex thin-wall castings, but the equipment is relatively large and the operation is cumbersome, which is only suitable for special requirements. The advantages are as follows:

(1) Compared with traditional gravity casting and vacuum suction casting, the 1mm thick vacuum pressure differential casting in the sample reflects good filling ability.

(2) Casting has a more compact crystalline structure and mechanical properties, casting strength performance, compared with vacuum casting and gravity casting increased by about 20% ~ 25%, elongation increased by about 50%.

(3) Vacuum molds can effectively reduce the stamping and stamping of castings and increase the density of castings by more than 1%.