In metal mold casting, should not only have good size accuracy, the surface finish teaching advantages, and the intensity of performance will be better.So for small batch production, the metal mold casting mould can be used repeatedly, and get the efficient production efficiency;When large quantities of medium and small castings, as long as the melting point of the casting material is not high, generally choose type metal forging.In general, either casting, die casting machine, die casting alloy and die casting mould indispensable three elements, need according to the actual situation to carry on the reasonable use, to the best combination, make casting up to standard.Casting development is obvious to all, in the field of casting way also become diversified, precision casting numerous casting method has a low pressure casting, it is more important, the advantages are more.But each has its own features, it is difficult to have a kind of method is perfect, so the low pressure casting is flawed in some way.