Low-pressure casting process for high-strength aluminum alloy casting for automobile

Abstract

The invention discloses a low-pressure casting process for a high-strength aluminum alloy casting for an automobile, and belongs to the field of aluminum alloy castings. The low-pressure casting process for the high-strength aluminum alloy casting for the automobile comprises the specific steps that firstly, gas is injected into a low-pressure casting device, the low-pressure casting device comprises a crucible, a pressurizing pipe is fixedly connected to the crucible, a sealing cover is fixedly connected to the crucible, a lower cavity is fixedly connected to the sealing cover, an upper cavity is clamped to the lower cavity, two pairs of cooling plates matched with the lower cavity are fixed to the outer wall of the upper cavity, and molten aluminum in the device is pushed into the cavities through air pressure; the molten aluminum enters the cavities to be cooled and formed; after the cavities are opened, the device is demolded; and pressurized gas in the low-pressure casting device is exhausted, and device maintenance is carried out. The cavities can be cooled in a staged manner, and after casting is finished, residual molten aluminum drops can be brushed through a buffer plate in a liquid rising pipe, so that the molten aluminum completely flows back into the crucible.

Description

technical field [0001] The invention relates to the field of aluminum alloy castings, in particular to a low-pressure casting process for high-strength aluminum alloy castings for automobiles. Background technique [0002] Low-pressure casting is a casting method in which liquid alloy is pressed into the mold cavity from bottom to top under pressure, and solidified under pressure to obtain castings. The principle of low-pressure casting is that dry compressed air or inert gas is introduced into the sealed crucible, and with the help of the pressure acting on the liquid metal surface, the molten metal is filled with the mold smoothly along the riser pipe from bottom to top through the sprue. , Filling pressure is generally 20 ~ 60kPa. When the casting is completely solidified, the gas pressure on the liquid surface is released, so that the unsolidified molten metal in the riser and runner flows into the crucible by its own gravity, then the mold is opened, and the casting is...

AI Technical Summary

Problems solved by technology

[0004] However, in the current low-pressure forging process, the molten metal is likely to remain on the inner wall of the riser tube. When the molten metal on the inner wall of the riser tube solidifies, it is easy to carry small particles formed by the molten metal into the cavity after the subsequent rise of the molten metal , to reduce the quality of the cast workpiece

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