Low-pressure casting is a casting method that allows liquid metal to fill the cavity and solidify under pressure to obtain castings. Because the pressure used is low (20~60kPa), it is called low pressure casting.

 

The process of machine tool casting is: in a sealed crucible (or sealed tank), dry compressed air is introduced, and the molten metal will enter the sprue along the riser pipe under the action of gas pressure and rise, and enters steadily through the inner runner Mold cavity, and maintain the gas pressure on the liquid surface in the crucible until the casting solidifies. Then the gas pressure on the liquid surface is released, the unsolidified molten metal in the riser pipe flows back to the crucible, the mold is opened again, and the casting is taken out.

 

The basic characteristics of the low-pressure casting process of machine tool castings: the filling speed and pressure can be adjusted appropriately. There are two types of casting molds used in low pressure casting: metallic molds and non-metallic molds. Metal molds are mostly used for large-scale, mass-produced non-ferrous metal castings, and non-metallic molds are mostly used for single-piece small-batch production. For example, sand molds, graphite molds, ceramic molds and molten mold shells can be used for low-pressure casting, and more used in production It's still a sand mold. However, the air permeability and strength of the molding material of the sand mold for low pressure casting should be higher than that of gravity pouring, and the gas in the cavity is exhausted by the exhaust duct and sand pores.

 

The part of the casting away from the gate is solidified first, so that the gate is solidified, so that the casting is fed through the gate during the solidification process to achieve sequential solidification.

 

cast iron machine tables

 

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