The difference between die casting mold and plastic mold;

1, the injection pressure of the die casting die is high. Therefore, the template requirements are relatively thick. Prevent deformation

2. The gate of the die casting mold is different from that of the injection mold. It is necessary to make a shunt cone to decompose the high pressure of the logistics.

3. The die core of the die casting die does not need quenching. Because in the process of die casting, the temperature in the mold cavity exceeds 700 degrees. So every molding is equivalent to quenching. The mold cavity will become harder and harder. Generally, the injection mold should be quenched to more than HRC52.

4. The general cavity of die casting die should be nitrided. Prevent alloy from sticking to mold cavity.

5. Generally, the corrosion of die-casting dies is relatively large. The outer surface is usually blue.

6. Compared with the injection mold. The gap between movable fittings (such as core-pulling slider) of die casting mold is large. Because the high temperature during die casting will cause thermal expansion. If the gap is too small, the mold will get stuck.

7. The matching requirements of parting surface of die casting die are higher. Because the fluidity of alloy is much better than that of plastic, it is very dangerous for the high temperature and high pressure material flow to fly off the parting surface.

8. Injection molds generally rely on thimbles. The parting surface can exhaust air. Die-casting dies must be equipped with exhaust slots and slag collection bags (collecting cold heads).

9. Inconsistent shapes. The injection speed of die casting die is fast. A period of injection pressure. Plastic molds are usually injected in several stages. Keep the pressure.

10, the die-casting mold is a two-plate mold (three-plate die-casting mold has not been seen for the time being). Plastic molds have different product structures, and 3-plate molds are common. The number and sequence of mold opening match the mold structure. Square thimbles are usually not used in die casting molds. Company drum.

1 1, the inclined pin (high temperature and good solution fluidity) is easy to get stuck, which leads to unstable mold production. In addition, the plastic mold and the die-casting mold are made of different steels; Generally, 45# steel, T8, T 10 and other steels are used for plastic molds, and heat-resistant steels such as 3Cr2W8V are mainly used for die-casting molds.

Extended data

First, the type:

There are many kinds of molds.

According to the processing object and processing technology can be divided into:

1. Mould for processing metal.

2. Machining nonmetal and powder metallurgy molds. Including plastic molds (such as two-color molds, compression molds and extrusion molds, etc.). ), rubber mold and powder metallurgy mold.

According to the structural characteristics, the die can be divided into plane blanking die and cavity die with space. Generally, molds are single-piece and produced in small batches.

Second, the classification:

Depending on the materials formed

1, metal mold, plastic mold and its special mold.

2. Hardware molds are divided into stamping molds (such as punching mold, bending mold, drawing mold, hole-turning mold, shrinking mold, wavy mold, bulging mold, shaping mold, etc.). ), forging die (such as forging die, upsetting die, etc. ), extrusion die, extrusion die, die casting die, forging die, etc.

3. Non-metallic molds are divided into plastic molds and inorganic non-metallic molds. According to the different materials of the mold itself, the mold can be divided into sand mold, metal mold, vacuum mold, paraffin mold and so on. Among them, with the rapid development of polymer plastics, plastic molds are closely related to people's lives. Plastic molds can generally be divided into injection molds, extrusion molds and gas-assisted molding.

Mold and so on.

Third, the composition:

1. In addition to the mold itself, the mold needs a mold base, a mold base, and a device for ejecting parts caused by the core. These parts are generally made into universal models.

Mold enterprises need to be bigger and better, and determine product positioning and market positioning according to market demand, technology, capital and equipment. These practices are especially worth learning and learning from small mold enterprises.

2, concentrate on gradually forming their own technological advantages and product advantages. Therefore, mold enterprises in China must actively learn from the experience of these foreign advanced enterprises in order to develop better in the future.

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