What Should You Pay Attention To When Designing The Structure Of Castings?

- Feb 08, 2018-

1 Since the castings are cooled and solidified in the metal type faster than the sand type, and the metal type is unacceptable, the casting stress generated in the castings is more prone to large cracks than the sand castings during the metal type casting Inadequate pouring, cold insulation, white mouth (for castings) and other defects. usually:

(1) The following structural problems should be observed in preventing the occurrence of cracks in metal-type castings:

A uniform wall thickness, wall transition and connection to be mitigated, more appropriate corner fillet and other requirements should be more stringent than sand castings;

B should be connected to the vertical wall connected to tilt;

C For structurally weaker parts should be set ribs, bosses, etc. to be strengthened to prevent casting cracks;

D should be minimized to hinder the free contraction of castings bosses, ribs, flanges and other prominent parts;

E in the castings arranged on the ribs, it should also take into account its impact on casting shrinkage.

(2) The following structural problems should be observed in the prevention of metal-based casting casting from insufficient pouring and cold separation:

A cast wall thickness should not be too thin, especially when the castings larger size can not be too thin;

B should avoid a large horizontal plane, because it makes the casting pouring, the liquid metal rises very slowly, and the air contact surface is large, easy to oxidation, at the same time as the metal type heat dissipation, liquid metal loss of fluidity quickly, easily lead to pouring Insufficient, cold, slag and other defects;