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Casting process design

Casting process design

2019-09-25

The casting process design involves the process design of the part itself, the design of the pouring system, the design of the feeding system, the design of the ventilation holes, the design of the cooling system, and the design. Special casting process. [3]

The process design of the part itself involves the machining allowance of the part, the selection of the casting position, the parting surface, the selection of the casting process parameters, the dimensional tolerance, the shrinkage rate, the draft angle, the correction amount, the negative type of the design, etc. [1].

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

For mechanized production lines and mass production, in order to facilitate production and ensure the quality of castings, the sprue is generally placed on the parting surface of the mold, and the selection of embedded blanks and parting surfaces is selected according to the casting position of the casting. The road opening at the parting surface of the mold belongs to the "middle injection type" casting system. Liquid metal inevitably contains a certain amount of "slag" during the casting process. In order to improve the slag blocking ability of the casting system, it is appropriate to use a "closed" casting system.

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

The design of the feed system is a reasonable riser design and subsidies to compensate for the shrinkage of the liquid and solidified body of the casting during the solidification process to obtain the engineering technology of sound casting [1].

The vent hole is used to exhaust the gas in the cavity, improve the filling ability of the molten metal, eliminate the supercooled metal liquid and scum that are first filled into the cavity, and can also be used to observe whether the cavity is filled.


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