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What is the difference between a die-casting mold and an injection mold

update:08-04-2021
abstract:

Although the structure of the die-casting mold and the […]

Although the structure of the die-casting mold and the plastic mold is the same, the actual difference between the die-casting mold and the plastic mold is shown as follows:

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 it requires a high pressure of the split cone to decompose the material flow.

3, die-casting mold cores do not need to be quenched, because the temperature in the cavity during die-casting exceeds 700 degrees, so each molding is equivalent to one quenching, the cavity will become harder and harder, while the general injection mold needs to be quenched to above HRC52.

4. Die-casting molds generally need to be nitrided in the cavity to prevent the alloy from sticking to the cavity.

5. The die-casting mold has relatively large corrosion, and the outer surface is generally blue.

6. ​​Compared with injection molds, die-casting molds have a larger matching clearance for movable parts (such as core-pulling sliders) because the high temperature of the die-casting process will cause thermal expansion. If the clearance is too small, it will cause the mold to jam.

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

8. Generally, injection molds can be vented by thimble and parting surface. Die-casting molds must have venting grooves and slag bag (collecting cold material head).

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

10. The die-casting mold is a two-plate mold (I haven't seen a 3-plate die-casting mold for the time being). The product structure of different plastic molds is different. The three-plate mold is common. The number and sequence of mold openings are matched with the mold structure. The mold usually does not use square thimble and tube.

11. Tilt pins (high temperature and good solution fluidity) are easy to jam and cause unstable mold production. In addition, plastic molds and die-casting molds are made of different steel; plastic molds generally use 45# steel, T8, T10, etc. Steel, and die-casting molds mainly use heat-resistant steel such as 3Cr2W8V.