Is die casting difficult to learn? I didn't do it! Want to go to work

Die casting is a metal casting process, which is characterized by applying high pressure to molten metal by using the inner cavity of the die. Mold is usually made of higher strength alloy, which is somewhat similar to injection molding. Most die-casting castings are iron-free, such as zinc, copper, aluminum, magnesium, lead, tin and lead-tin alloys and their alloys. According to the different types of die casting, it is necessary to use cold chamber die casting machine or hot chamber die casting machine.

Die casting process

The traditional die casting process mainly includes four steps, namely high pressure die casting. These four steps, including mold making, mold filling, injection and sand dropping, are also the basis of various improved die casting processes. In the preparation process, it is necessary to spray lubricant into the mold cavity, which not only helps to control the temperature of the mold, but also helps to demould the casting.

The mold can then be closed and molten metal can be injected into the mold with a high pressure of 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. Because there may be multiple cavities in a mold, multiple castings may be produced in each casting process.

Residues need to be separated in the process of sand dropping, including mold opening, runner, gate and flash. This process is usually completed by extruding the casting through a special trimming die. Other grinding methods include sawing and grinding. If the gate is fragile, you can directly hit the casting, which can save manpower. Excess mold openings can be reused after melting. The usual output is about 67%.