What should be paid attention to in the process design of gravity casting machine?

2022-09-14

The metal mold castings commonly used in gravity casting machines can be divided into two categories: metal molds and non-metal molds. Metal molds are mostly used for large-scale and mass-produced rare metal castings, while metal mold castings for non-metallic materials are mostly used for small-batch production. Spare parts, such as sand molds, high-purity graphite molds, porcelain molds and fused solid mold shells, etc., all of which can be used for low-pressure casting, and sand molds are used more frequently in production and manufacturing. But sand molds are used for low-pressure casting The material in the design has a wide air permeability and compressive strength, and the force is large during casting, and the steam in the female mold is completely discharged by the exhaust pipe and the pores of the sand grains.

In order to make flexible use of the liquid metal material behind the gravity casting machine, under the effect of the working pressure, the casting is completed from top to bottom, and various factors in use should be considered when developing the process technology.

Castings should first prevent the position of the glue inlet from condensing, let the glue inlet condense, so that the castings can be fed according to the glue inlet during the entire condensation process, and the order of condensation should be maintained. The following countermeasures are often used: 1. The glue inlet is built At the position of the thick-walled tube of the casting, then cancel the glue inlet at the thick-walled position; 2. Adjust the wall thickness of the casting with the production margin to adjust the specific gravity of the casting; 3. Change the water cooling standard of the casting.

For castings with a large difference in wall thickness, when it is difficult to obtain the standard of sequential condensation with the usual countermeasures, some unique methods can be used to perform partial water cooling at the thick-walled tube of the casting to maintain sequential condensation.

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