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Casting process design

Casting process design

2019-09-25

Casting process design involves the process design of parts themselves, casting system design, feed system design, ventilation hole design, cooling system design, and design. Special casting process. [3]

The process design of parts itself involves parts' machining allowance, casting position selection, parting surface, casting process parameters selection, dimensional tolerance, shrinkage, drafting Angle, correction, negative type of design, etc. [1].

The gating system is used to guide the molten metal into the cavity. Whether the design of pouring system is reasonable or not has a great influence on casting quality. It is easy to cause various types of casting defects, such as inadequate casting, cold separation, sand washing, slag inclusions, inclusions, sand inclusions and other casting defects. The design of gating system includes the selection of gating type system, the selection of gate position, and the determination of the cross section size of the components of gating system. In addition, the choice of casting system is also very important, so how do we choose the right casting system?

For mechanized production lines and mass production, in order to facilitate production and ensure casting quality, the runner is generally placed on the parting surface of the mold, and according to the casting casting location, the selection of embedded blanks and parting surface. The opening of the parting surface of the mould belongs to the "intermediate injection" casting system. Liquid metal in the casting process inevitably contains a certain amount of "slag". In order to improve the slag blocking ability of casting system, it is suitable to adopt "closed" casting system.

In the process of casting, the design of casting technology has a great influence on the quality of casting products, but the choice of casting system cannot be ignored.

The design of the feed system is a reasonable riser design and subsidy to compensate for the shrinkage of the liquid and solidified solids in the casting during solidification to obtain engineering techniques for sound casting [1].

The air hole is used to discharge the gas in the cavity, improve the filling capacity of molten metal, eliminate the supercooled metal liquid and scum in the cavity first, and also can be used to observe whether the cavity is filled or not.


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