Principle of low pressure casting.

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? ? ?Low-pressure casting is to make liquid metal under pressure to complete the filling cavity and solidification process two get castings of a casting method. Because the pressure used is low (20 ~ 60kPa), so it is called low-pressure casting. The process is: in the sealed crucible (or sealed can), pass into the dry compressed air, the metal liquid in the role of gas pressure, along the rise of the liquid pipe into the straight sprue rise, through the inner sprue smoothly into the cavity, and to maintain the crucible on the liquid surface of the gas pressure, until the casting is completely solidified. Then the gas pressure on the liquid surface is lifted, so that the unsolidified metal liquid in the rising liquid pipe flows back to the crucible, and then the mold is opened and the castings are taken out.

Advantages of low pressure casting

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1、Less gas and debris involved, can change the speed of pressurization, the molten soup is filled by laminar flow.

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2, the use of bottom injection type filling, liquid metal filling smooth, no splash phenomenon, can avoid the involvement of gas and the wall and core of the type of scouring, improve the qualification rate of castings.

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3, castings crystallized under pressure, castings dense organization, clear contours, surface finish, high mechanical properties, for the casting of large thin-walled parts is particularly advantageous.

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4, can change the speed of pressurization, molten soup filling by laminar flow.

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5, the use of a wide range of materials.

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Low-pressure casting shortcomings

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1, low production efficiency, compared with gravity die casting. Die casting > gravity > low pressure

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2, casting cycle is long, poor productivity. In order to maintain the direction of solidification and molten soup fluidity, mold temperature is higher, slow solidification.

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3、 The organization near the gate is coarse, and the mechanical properties of the lower mold surface are not high, which requires comprehensive and strict management (temperature, pressure, etc.).

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? ?Dongguan Shengshi Weiye Machinery Technology Co., Ltd. specializes in the production of various series of hydraulic presses, and casting equipment. Hydraulic pressure equipment has four column hydraulic press, frame hydraulic press and C hydraulic press and other series of hydraulic press, pressure range from 1 ton to 2000 tons and more than 100 kinds of specifications. Casting equipment has Low Pressure Casting Machine and Gravity Casting Machine, there are more than 10 years of experience in the production of casting equipment, can be customized according to customer needs, if you need, please contact us.