Magnesium alloy injection molding technology has become a research hotspot in the industry due to its many advantages. Recently, there have been three types of injection molding technology: hot runner method, casting forging method, and powder release agent.
The basic principle of injection molding is to melt the low-melting alloy and then fill it into a metal mold at high speed and high pressure. Rice-sized raw materials are fed from the feed port and then passed into a cylinder heated to a set temperature and transported to the front end thereof. At this time, the shear force is increased by the rotation of the wire to make a molten alloy in a semi-molten state and then injected into the metal mold at a high speed. The temperature of the alloy melt is maintained at 560-630°C and the solid fraction is controlled. Nippon Steel has introduced technology patents from the US company Thixomat, and manufactures and sells molding machines.
Compared with the die-casting method, the magnesium alloy injection molding method has a high casting pressure, so that crystal grains near the surface are refined, and thus high corrosion resistance and mechanical strength can be obtained. The reproducibility of the metal mold is also good. Since the temperature of the alloy melt is 50 to 70° C. lower than that of the die casting method, the dimensional change of the molded product with heat shrinkage can be controlled, thereby increasing the service life of the metal film. In addition, the melting furnace and SF6 gas-fired gas are not used, and explosion and dust do not occur, meeting safety and environmental requirements.
The latest injection molding technology:
1. Hot runner mode: often heating the flow path in the metal mold, using the method of maintaining the molten metal to improve the material yield, with the advantages of shortening the cycle time, processing multiple molds, and miniaturizing the molding machine.
2. Casting forging method: Casting a molded product is a semi-finished product that is close to the shape of the finished product. Only one process of precision forging is used. There is an advantage that cracking does not occur even at high speed forging.
3. Powder release agent: Usually sprayed with water-soluble release agent, there is the phenomenon of release agent scattered. Nippon Steel Corporation developed a method of vacuum-assisted powder release agent in a closed metal mold. It has the effect of shortening the cycle time and improving the life of the metal mold in a clean environment.
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