The difference between die casting mold
and plastic mold
1. The injection pressure of the die-casting mold is large, so the template is required to be relatively thick to prevent deformation
2. The gate of the die-casting mold is different from that of the injection mold, and the high pressure of the split cone is required to decompose the flow.
3. The die-casting mold core does not need to be quenched, because the temperature in the mold cavity exceeds 700 degrees during die-casting. Therefore, each molding is equivalent to quenching once. The cavity will become harder and harder. The general injection mold should be quenched to above HRC52.
4. Die-casting molds generally need nitriding in the cavity to prevent the alloy from sticking to the cavity.
5. Generally, the die-casting mold is relatively corroded, and the outer surface is generally blued.
6. Compared with the injection mold, the fitting clearance of the movable part of the die-casting mold is larger, because the high temperature of the die-casting process will cause thermal expansion, and if the clearance is too small, the mold will be stuck.
7. The parting surface of the die-casting mold has higher requirements, because the fluidity of the alloy is much better than that of the plastic. It is very dangerous for the high temperature and high pressure material to fly out of the parting surface
8. The injection mold is generally exhausted by the thimble, parting surface, etc., and the die-casting mold must have an exhaust groove and a slag collection bag;
9. The molding is inconsistent, the injection speed of the die-casting mold is fast, and the injection pressure is one stage. Plastic molds are usually injected in several sections and kept under pressure.
10. Die-casting molds are two-plate molds that are opened at one time. Different plastic molds have different product structures. Three-plate molds are common, and the number and sequence of mold openings are matched with the mold structure. Die-casting molds usually do not use square thimbles, cylinders, and oblique pins (high temperature and good fluidity of the solution), which are easy to get stuck and lead to unstable mold production.