What are the characteristics of high pressure die casting

Because metal copper, Zinc, aluminum, and aluminum alloy have good fluidity and plasticity, and the casting process is cast in a pressure die-casting machine, aluminum die-casting parts can be made into various complex shapes. They can also be made into more complex shapes. High precision and finish, thus significantly reducing the machining amount of castings and the casting allowance of metal copper, zinc, aluminum, or aluminum alloys, not only saving electricity, metal materials but also significantly saving labor costs; and copper, zinc, aluminum, and aluminum alloys have excellent thermal conductivity, small specific gravity, and high machinability; thus die castings are widely used in automobile manufacturing, internal combustion engine production, motorcycle manufacturing, motor manufacturing, oil pump manufacturing, transmission machinery manufacturing, Precision instruments, landscaping, power construction, architectural decoration, and other industries.

The traditional die casting process mainly consists of four steps, or high pressure dies casting. These four steps, including mold preparation, filling, injection, and shakeout, are the basis for various modified die casting processes. Lubricant is sprayed into the mold cavity during the preparation process. In addition to helping control the temperature of the mold, the lubricant can also help the casting release. The mold can then be closed, and the molten metal injected into the mold at high pressure, which ranges from about 10 to 175 MPa. After the molten metal is filled, the pressure is maintained until the casting solidifies. The push rod then pushes out all the castings, and since there may be multiple cavities in a mold, there may be multiple castings per casting. The doffing process needs to separate the residue, including the die, runner, gate, and flash. This process is usually done by squeezing the casting through a special trim die. Other doffing methods include sawing and sanding. If the gate is fragile, you can directly beat the casting, saving the workforce. Excess mold openings can be reused after melting. The usual yield is about 67%.

The high-pressure injection causes the mold to be filled very quickly so that molten metal fills the entire mold before any part solidifies. In this way, you can avoid surface discontinuities even in thin-walled sections that are difficult to fill. However, this also leads to air entrapment, as it is difficult for air to escape when filling the mold quickly. You can reduce this problem by placing vents on the parting line, but even exact processes can leave porosity in the casting center. Most die castings can complete some structures that we cannot do by casting through secondary processing, such as drilling and polishing.