What is the difference between the structure of die-casting mold and plastic mold

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 a splitter cone is needed to decompose the high pressure of the material flow

3. The die core of the die-casting die does not need quenching, because the temperature in the die cavity during die-casting exceeds 700 ℃. So each molding is equivalent to quenching. The cavity will become harder and harder. The general injection mold should be quenched to above hrc52.

4. Generally, the die-casting mold cavity should be nitrided to prevent the alloy from sticking to the mold cavity.

5. Generally, the corrosion of die-casting mold is relatively large, and the outer surface is generally blued.

6. Compared with the injection mold, the fitting clearance of the movable fitting part of the die-casting mold (such as the core pulling slider) is larger, because the high temperature of the die-casting process will cause thermal expansion. If the gap is too small, the die will be stuck.

7. The matching requirements of the parting surface of the die-casting die are higher, because the fluidity of the alloy is much better than that of plastic. High temperature and high pressure material flow flying out of the parting surface will be very dangerous

8. Generally, the injection mold can be vented by ejector pin, parting surface, etc., and the die-casting mold must be provided with an exhaust slot and a slag collecting bag (collecting the cold material head);

9. The molding is inconsistent, the injection speed of the die-casting mold is fast, and the injection pressure of one section is high. Plastic molds are usually injected in several sections to maintain pressure.

10. The die-casting mold is two plate mold (I haven't seen three plate die-casting mold for the time being). The product structure of different plastic mold is different. Three plate mold is common, and the number and sequence of mold opening are compatible with the mold structure. Our die-casting dies usually do not use square thimbles, cylinders, and oblique pins (high temperature and good solution fluidity) that are easy to get stuck, resulting in unstable die production.

In addition, plastic molds and die-casting molds are made of different steels; Plastic molds generally use 45# steel, T8, T10 and other steel, while die-casting molds mainly use heat-resistant steel such as 3Cr2W8V.