Novel pressure device for finely turned bright aluminum alloy wheel

Abstract

The invention discloses a novel pressure device for a finely turned bright aluminum alloy wheel. The device consists of a nitrogen making machine, a nitrogen dryer, a gas storage tank, a system control cabinet for a low-pressure casting machine, a pressure relief nitrogen recovery tank, gas conduits and a holding furnace for the low-pressure casting machine. Nitrogen generated by the nitrogen making machine is introduced into the nitrogen dryer through the conduit; the dried and purified nitrogen is introduced into the gas storage tank through the conduit, and the pressure of the nitrogen in the gas storage tank is 500 to 700kpa; the nitrogen in the gas storage tank is introduced into the system control cabinet for the low-pressure casting machine through the conduit, and is introduced into the holding furnace for the low-pressure casting machine through the system control cabinet for the low-pressure casting machine for pressurization; and gas obtained after pressure relief when a casting is finished through die casting flows into the pressure relief nitrogen recovery tank through the conduit, and the gas in the pressure relief nitrogen recovery tank flows into the nitrogen dryer through the gas conduit for drying and recycling. In the invention, the nitrogen is used as a pressurization medium of the low-pressure process, so that the oxidation of molten aluminum is greatly reduced, and needle holes and slag eyes on a final product are reduced; meanwhile, the loss of aluminum, magnesium and strontium is lower, so that mechanical properties of the product are guaranteed.

Description

technical field [0001] The invention relates to the field of casting of aluminum alloy wheels for automobiles, in particular to a novel pressurizing device for aluminum alloy wheels with a fine finish. Background technique [0002] At present, in the manufacturing process of automobile aluminum alloy wheels, especially high-quality aluminum alloy wheels, the purification of molten aluminum is a very important link; Prolonged air intake and oxidation, resulting in pinholes, slag holes and other problems in the product, affecting the quality and appearance of aluminum alloy wheels. In order to remove oxide slag inclusions and hydrogen from the molten aluminum to the greatest extent, the method of purifying the molten aluminum by nitrogen rotary jetting in the transfer ladle is generally adopted, and dry compressed air is generally used as the pressurized medium in the low-pressure casting process. However, dry compressed air still contains 21% oxygen. During the low-pressure ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the problem that the traditional low-pressure casting aluminum alloy wheel casting process generally adopts compressed air as the pressurized medium, which is easy to react with the aluminum liquid to generate oxidation reaction and produce oxide slag inclusion, and provides a new The pressurizing device, specifically a new pressurizing device for bright aluminum alloy wheels

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