High-vacuum die-casting production process of rear rocker arm of motorcycle

Abstract

The invention aims to provide a high-vacuum die-casting production process of a rear rocker arm of a motorcycle. The high-vacuum die-casting production process comprises the steps of smelting, heat preservation, mold closing, melting liquid injection, slow-speed sealing, pressure chamber vacuumizing, slow-speed pressing, cavity vacuumizing, high-speed pressing, mold opening and lubrication spraying. According to the rear rocker arm of the motorcycle produced by adopting the high-vacuum die-casting process, the air content in casting can be reduced, the air hole defect is reduced, and the T6 heat treatment can be performed. The casting surface forming quality and the blank size precision are improved, machining is reduced, the casting has higher tensile strength and higher yield strength, the casting quality is lighter, the consumption of resources and energy is reduced, the production cost is reduced, and the economic benefit is improved.

Description

technical field [0001] The invention relates to a casting production process of a rear rocker arm of a motorcycle, in particular to a high vacuum die-casting production process of a rear rocker arm of a motorcycle, and belongs to the technical field of automobile and motorcycle parts manufacturing. Background technique [0002] The motorcycle rear rocker arm is an important safety component in the motorcycle. It connects the motorcycle rear shock absorber, the rear shock absorber connecting rod, the rear rocker arm pivot and the rear wheel, and transmits the force and moment between the frame and the rear wheel. . Common forming methods of the rear rocker arm: steel pipe welding forming, aluminum alloy gravity casting or low pressure casting. It is welded by steel pipe, which has high quality, cumbersome process, difficult control of welding deformation, and poor overall rigidity. Using aluminum alloy gravity casting or low pressure casting, it is difficult to form thin-wa...

AI Technical Summary

Problems solved by technology

It is welded by steel pipe, which has high quality, cumbersome process, difficult control of welding deformation, and poor overall rigidity.

Using aluminum alloy gravity casting or low pressure casting, it is difficult to form thin-walled deep cavity parts, the surface is rough, and there are often defects such as blisters, shrinkage cavities, and under-casting. The yield rate is low, the production efficiency is low, the amount of machining is large, and the cost is high.

The traditional die-casting process has the advantages of good dimensional accuracy and high surface finish, low investment, high efficiency, and short process route, but there are many pores in the casting, and the mechanical properties are limited, which is not conducive to force transmission, and cannot be heat treated and welded. The high-vacuum die-casting process can solve the defects of pores and obtain castings with dense internal structure. The castings can be heat-treated in the later stage to obtain more excellent comprehensive mechanical properties

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