Gravity casting refers to the process of injecting gold liquid into the mold under the action of the earth's gravity, also known as gravity casting.
Pressure casting refers to the process of injecting gold liquid into the mold under the action of other external forces (excluding gravity).
The main feature of die casting is that the gold liquid fills the cavity under high pressure and high speed, and is formed and solidified under high pressure. The disadvantage of die casting is: because the gold liquid fills the cavity under high pressure and high speed, it is inevitable The air in the cavity is wrapped inside the casting to form subcutaneous pores, so aluminum alloy die castings are not suitable for heat treatment, and zinc alloy die castings are not suitable for surface spraying (but paint can be sprayed). Otherwise, when the pores inside the casting are heated for the above treatment, they will expand when exposed to heat and cause the casting to be deformed or bubbling. In addition, the machining allowance of die-casting parts should also be smaller, generally around 0.5mm, which can reduce the weight of the casting and reduce the amount of cutting to reduce the cost. It can also avoid penetrating the dense layer of the surface and exposing the subcutaneous pores. The artifact is scrapped.