Die-casting die is a method of casting liquid die forging, which is a process completed on a special die-casting die forging machine. The basic process is: molten metal is first cast at low or high speed and filled into the cavity of the mold, which has a movable cavity surface. It is the cooling process of molten metal forged under pressure, which not only eliminates the shrinkage crater and porosity defects of the blank, but also makes the internal structure of the blank reach the forging broken grains. The comprehensive mechanical properties of the blank were significantly improved.

Are zinc alloy die-casting molds the same as aluminum alloy die-casting molds?

Zinc alloys differ from aluminum alloys in die casting. Die casting principles and processes are universal, but molds cannot be universal.

The aluminum alloy melting point 650 material has higher requirements for high temperature resistance. Generally use 8407 material. In the production process, the material will be affected, so when designing the aluminum alloy mold, care must be taken not to consider the design of the chestnut. The production of 1W molds requires tempering of the mold (to reduce the internal stress of the mold) to prolong the life of the mold. Since the fluidity of aluminum alloys is poorer than that of zinc alloys, there are requirements for exhaust gas during the design process.

Due to the melting point of zinc alloy 385. Use SKD61 material. The cold and cold cooling system of the zinc alloy mold has high requirements, otherwise it will cause high temperature foaming of the product. Molds can be produced directly without tempering. When producing zinc alloy molds, some products will have a larger waterline, not just the surface, so the design of the slag ladle has requirements:

1. Relatively significant.​​
2. Good casting performance. It can die-cast precision parts with complex shapes and thin walls, and the casting surface is smooth.​​
3. Surface treatment: electroplating, spraying, painting, polishing, grinding, etc.​​
4. Melting and die casting do not absorb iron, do not corrode the outline, and do not stick to the mold.​​
5. Good mechanical properties and room temperature wear resistance.​​
6. Low melting point, melting at 385°C, easy for die casting.

Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, chemical industry and other industries.

How to Control the Quality of Die Castings in Zinc Alloy Die Casting Plant

Die casting mold

Zinc alloy die castings are all made by die casting molds. As a system, there are feeding, unloading and slagging links composed of various elements. The purpose is to get the aluminum alloy liquid into the cavity, fill it with the proper flow pattern, and exhaust the gas in the system to the maximum extent. The so-called suitable flow pattern is that there is no liquid flow collision, entrainment and pinching, and the speed is stable. According to the analysis of the metal flow state, combined with the setting of the overflow tank, open the exhaust tank at an appropriate position to exhaust the gas in the cavity. In cooperation with the exhaust groove, an overflow groove is formed, which can not only discharge the gas and cold dirty metal from the cavity, but also control the filling flow state of the molten metal to reduce or prevent the formation of eddy currents.

Focus on die casting process design

Die casting technology is a unified technology that combines the three elements of die casting machine, zinc alloy and die casting. The focus is on the quality of die castings, so that various process parameters meet the needs of die casting production. In the case that the die-casting process meets the molding requirements, a low temperature and low pressure shooting speed should be used as much as possible to reduce the formation of shock, splash and eddy current.

Choose a suitable die casting machine.

The quality of zinc alloy die castings largely depends on the injection performance of the die casting machine. Die casting machine is the key equipment for die casting production. The correct choice of die casting machine is of great significance to ensure product quality, improve production efficiency, reduce production costs and ensure production safety. To meet the requirements of zinc alloy die-casting quantity, product size and structure, casting materials and high-quality products, the selection of large-tonnage die-casting machines, cold-chamber or hot-chamber die-casting machines is fully considered.

Appropriate selection of new technologies

The hanging vacuum die casting machine book can effectively meet the feeding requirements. Strictly control the mold temperature, which can effectively control the dimensional accuracy of zinc alloy castings and prolong the service life of the mold.

Conclusion

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