1.Improve the structure of boss, flange and rib plate that hinder the lifting
The boss (LAP), flange, rib plate, etc. on the side wall of the casting often hinder the lifting of the die, so the sand core has to be added. Therefore, try to improve to simplify the casting mold.
2.Try to eliminate the surface side concave of casting
If there is a concave part on the side wall of the casting, it often hinders the lifting of the mold, so the sand core has to be added. Therefore, try to improve to simplify the casting mold.
3.Improve the inner cavity structure of casting and reduce the number of sand cores
4.Reduce and simplify parting surface
Try to use flat parting surface to reduce surface parting.
5.It is good for fixing and exhausting the sand core
The bottom is good for fixing the sand core, and the top is good for exhausting the sand core.
6.Remove unnecessary fillets
Some of the fillets have little effect on the quality of castings, but they have bad effect on the process of molding and core making, so they should be removed.