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About the production steps and technology of automobile die castings

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Update time : 2020-08-05 10:01:07
About the production steps and technology of automobile die castings
The traditional die-casting process is mainly composed of four steps, or called high-pressure die-casting. These four steps include mold preparation, filling, injection, and shakeout, which are also the basis of various improved die casting processes. During the preparation process, a lubricant needs to be sprayed into the mold cavity. In addition to helping to control the temperature of the mold, the lubricant can also help demold the casting. Then you can close the mold and inject the molten metal into the mold with high pressure. The pressure range is about 10 to 175 MPa. When the molten metal is filled, the pressure will be maintained until the casting solidifies. Then the push rod will push out all the castings. Since there may be multiple cavities in a mold, multiple castings may be produced during each casting process. The doffing process needs to separate the residue, including the mold opening, runner, gate and flash. This process is usually done by extruding the casting with a special trimming die. Other methods of doffing include sawing and sanding. If the gate is fragile, the casting can be directly beaten, which can save manpower. The excess mold opening can be reused after melting. The usual yield is about 67%.

       High pressure injection results in a very fast filling of the mold so that the molten metal can fill the entire mold before any part solidifies. In this way, even thin-walled parts that are difficult to fill can avoid surface discontinuities. However, this can also lead to air entrapment because it is difficult for air to escape when filling the mold quickly. This problem can be reduced by placing an exhaust port on the parting line, but even a very precise process will leave pores in the center of the casting. Most die-casting can be completed by secondary processing to complete some structures that cannot be completed by casting, such as drilling and polishing

        Automobile die-casting is a kind of pressure-casting part. It uses a pressure-casting mechanical die-casting machine equipped with a casting mold to pour liquid copper, zinc, aluminum or aluminum alloy into the inlet of the die-casting machine. Machine die-casting, casting copper, zinc, aluminum parts or aluminum alloy parts of the shape and size restricted by the mold, such parts are usually called die-casting parts.