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Production Design Documents of Foundry Technology

Production Design Documents of Foundry Technology

2019-09-23

Foundry process design involves process design of parts themselves, design of gating system, design of feeding system, design of ventilation holes, design of cooling system, and design. Special casting process. [3]

The process design of parts itself involves the spare parts, the selection of casting position, parting surface, the selection of casting process parameters, dimensional tolerance, shrinkage, drafting angle, correction, negative types of design, etc. [1].

The gating system is used to guide molten metal into the die cavity. Whether the design of gating system is reasonable or not has a great influence on the quality of castings. It is easy to cause various 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 cross-sectional dimensions of the components of gate control system. In addition, the choice of gating system is also very important, so how do we choose the appropriate gating system?

For mechanized production line and batch production, in order to facilitate production and ensure the quality of castings, the runner is generally placed on the parting surface of the mould, and the selection of the embedded blank and parting surface is selected according to the casting position. The road opening at the parting surface of the die belongs to the "intermediate injection mould" casting system. The liquid metal inevitably contains a certain amount of "slag" in the casting process. In order to improve the slag blocking ability of casting system, it is appropriate to adopt "closed" casting system.

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

The design of feeding system is a reasonable riser design and subsidy to compensate the shrinkage of liquid and solids in solidification process to obtain the engineering technology of sound casting.

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

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