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Low-pressure casting process of aluminum alloy turbine

A low-pressure casting and aluminum alloy technology, applied in the field of casting, can solve problems such as low product qualification rate, frequent repairs, and unreasonable processes, and achieve the effects of reducing production costs, less time, and improving work efficiency

Inactive Publication Date: 2015-07-01
QINGDAO YUGUANG PRECISION CASTING FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum alloy turbine castings are produced by resin sand cores and metal mold low-pressure casting processes. In the past, due to unreasonable processes in the production process, aluminum alloy turbine castings had many defects, resulting in a low pass rate and frequent repairs.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0014] The low-pressure casting process of the aluminum alloy turbine in this embodiment includes the following steps: (1) preheating the metal mold to 380°C and keeping it warm for 2 hours; (2) heating the resin sand core to 100°C with a far-infrared heating furnace, and Keep warm for 60 minutes, and put out of the furnace before pouring; (3) Aluminum alloy is melted in a steel plate lining resistance furnace, and then poured. The pouring temperature is 705°C, the filling time is 18S, and the holding time is 12min. It is 0.08MPa, and asbestos cloth is used as the sealing material for filling and maintaining pressure.

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Abstract

The invention discloses a low-pressure casting process of an aluminum alloy turbine. A metal mold is preheated to a temperature of 380 DEG C for keeping 2 hours; a resin sand core is heated to a temperature of 100 DEG C by a far infrared heating furnace for keeping 60 minutes, and is discharged from the furnace before the casting to perform the mold assembly; an aluminum alloy is molten by a steel plate furnace lined with a resistance furnace, and is cast at a temperature of 700-710 DEG C; the mold filling time is 15-20 S; the pressure keeping time is 10-12 min; and the mold filling pressure is 0.08 MPa. Asbestos cloth is adopted to seal so as to effectively prevent the problem of greater gas generation quantity due to the sealing by a sealing gasket in a traditional production process; and the proper casting temperature of 700-710 DEG C is selected, so that the time of the aluminum alloy in a crucible is shortened, the increment of the Fe content is reduced, the working efficiency is improved, the service life of a liquid rising pipe is prolonged, and the production cost is reduced.

Description

[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a low-pressure casting process of an aluminum alloy turbine. [0003] Background technique [0004] The aluminum alloy turbine is an important part of the railway locomotive. It is required to carry out the hydrostatic test under the pressure of 0.5MPa, and the pressure should not be leaked for 5 minutes. The requirement for such high air tightness determines that the inside of the casting cannot have any influence on the air tightness. Permanent sand holes, pores, shrinkage cavities and shrinkage porosity and other casting defects. Aluminum alloy turbine castings are produced by resin sand cores and metal mold low-pressure casting processes. In the past, due to unreasonable processes in the production process, aluminum alloy turbine castings had many defects, resulting in a low pass rate and frequent repairs. [0005] Contents of the invention [0006] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/04
CPCB22D18/04
Inventor 陈玉光
Owner QINGDAO YUGUANG PRECISION CASTING FACTORY
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