Manufacturing process for aluminum alloy bus wheel hub by gravity compression casting

Abstract

The present invention is a manufacturing process of gravity pressure casting aluminum alloy bus hub. The manufacturing process includes the following steps: (1) Clamping the mold (2) Casting: Pour aluminum liquid with a temperature of 720°C±5°C into the mold Casting in the cavity; (3) Blocking and sealing: quickly seal the mold cavity after casting, and the time interval from the completion of casting to sealing the mold cavity is less than 10 seconds; (4) Pressurize and fill the mold One stage: add dry compressed air of 0.2Mpa to the mold cavity after sealing and sealing for 0~10s through the ventilation pipe, so that the aluminum liquid is filled with the mold cavity; Section (7) cooling (8) mold opening to take the workpiece. The invention rapidly solidifies and crystallizes the aluminum liquid under medium pressure, improves the mechanical properties of the casting, can replace the forged bus wheel at low cost, has low production cost, high product safety performance, and the product has high market competitiveness and can be widely used. Thereby improving the economic benefit of the enterprise.

Description

technical field [0001] The invention relates to a manufacturing process of an aluminum alloy bus hub, in particular to a process for casting an aluminum alloy bus hub through gravity pressure. Background technique [0002] According to the casting method of aluminum alloy wheels, it can be roughly divided into gravity casting, low pressure casting, forging, etc. Gravity casting refers to the process of injecting molten metal into the mold under the gravity of the earth, also known as casting. Air (0.02~0.07Mpa / cm2) is applied to the liquid metal surface, and the molten metal is injected into the cavity under low pressure through the riser in the molten aluminum, and solidified under pressure to obtain castings, the method of gravity casting Not only is the power consumption large, the blank weight is large, and the work is inconvenient, but also the single-piece melting cost is high, the tensile strength, yield strength and elongation are all low, the comprehensive mechanica...

AI Technical Summary

Problems solved by technology

[0002] According to the casting method of aluminum alloy wheels, it can be roughly divided into gravity casting, low pressure casting, forging, etc. Gravity casting refers to the process of injecting molten metal into the mold under the gravity of the earth, also known as casting. Air (0.02~0.07Mpa / cm2) is applied to the liquid metal surface, and the molten metal is injected into the cavity under low pressure through the riser in the molten aluminum, and solidified under pressure to obtain castings, the method of gravity casting Not only is the power consumption large, the blank weight is large, and the work is inconvenient, but also the single-piece melting cost is high, the tensile strength, yield strength and elongation are all low, the comprehensive mechanical properties of the produced wheel products are poor, the product safety performance is poor and there is no Market competitiveness, and the current domestic production of bus wheels adopts the production process of 6061 forging and spinning. The production process is complicated, the equipment investment is large, and the cost remains high, so it cannot be widely used.

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