What is the difference between the structure of die casting mould and plastic mould

Update:28-03-2020
Summary:

Difference between die casting mold and plastic mold: 1 […]

Difference between die casting mold and plastic mold:
1. The injection pressure of die casting die is large. Therefore, the template should be relatively thick. Prevent deformation
2. The gate of die casting mold is different from that of injection mold. High pressure of the material flow to be decomposed by the splitter cone
3. The core of die casting die does not need to be hardened. Because the temperature in the die cavity is over 700 ℃. Therefore, each molding is equivalent to one quenching. The cavity will get harder and harder. The general injection mold should be quenched to above hrc52.
4. Generally, the cavity of die-casting die needs nitriding treatment. Prevent the alloy from sticking to the mold cavity.
5. Generally, the corrosion of die casting die is relatively large. The outer surface is generally bluish.
6. Compared with injection mold. The fit clearance of the movable part of the die casting die (such as the core pulling slider) should be larger. Because the high temperature of die casting process will cause thermal expansion. If the gap is too small, the die will be stuck.
7. The parting surface of die-casting die has higher matching requirements. Because the fluidity of alloy is much better than that of plastic, it is very dangerous for high temperature and high pressure material flow to fly out of parting surface.
8. Injection mold usually relies on thimble. The parting surface can be vented. The die-casting mould must be provided with an exhaust slot and a slag collecting bag (to collect the cold material head).
9. Forming is inconsistent. The injection speed of die casting die is fast. First stage injection pressure. Plastic molds are usually injected in several stages. Keep pressure.
10. The die-casting mold is two plate mold (I haven't seen three plate die-casting mold at present) one opening. Different product structures of plastic moulds are different. 3 plate moulds are common. The number and sequence of opening are matched with the die structure. Square thimble is not usually used in die casting die. Cylinder.
11. The inclined pin (high temperature and good solution fluidity) is easy to jam, which leads to unstable die production. In addition, the steel used for making plastic die and die-casting die is different. Generally, 45 × steel, T8, T10 and other steel are used for plastic die, while 3Cr2W8V heat-resistant steel is mainly used for die-casting die.

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