Double gear forging process and die based on sheet metal volume forming

Abstract

The invention discloses a duplicate gear forging process and mold based on plate bulk forming. Firstly, an annular plate blank is obtained according to a designed finished product through laser cutting or blanking, and the size of a shaft hole of the annular plate blank is the same as that of a shaft hole of the finished product; then shearing is performed to form flange inner teeth, and upsetting and thinning are performed on the part, on the outer sides of the inner teeth, of a flange; and finally extruding is performed to form flange outer teeth. According to the duplicate gear forging process and mold, shearing forming of the flange inner teeth, upsetting and thinning of the area, on the outer sides of the inner teeth, of the flange and extrusion forming of the flange outer teeth are completed in one working procedure in sequence, the formed duplicate gear is good in surface quality and high in size precision, and the material utilization rate is high. The forming belongs to near-net forming. The duplicate gear forging process and mold also have the advantage that the mold cost is low.

Description

technical field [0001] The invention relates to a technology in the field of metal plastic forming, in particular to a double gear forging process and die based on sheet metal volume forming. Background technique [0002] As an important transmission part, the duplex gear has complex shape, high precision and strength requirements, and is generally manufactured by machining, powder metallurgy sintering, fine blanking, pendulum rolling or hot forging. [0003] Machining and powder metallurgy sintered dual gears have high precision, but their strength is often low, which is difficult to apply in some transmission systems with high mechanical performance requirements; fine blanking formed dual gears have high strength and Precision, but it has a high dependence on fine blanking equipment, and usually requires multiple processes to complete, and the cost of the mold is high; the pendulum rolling process belongs to progressive forming, the forming load is small, and the plasticit...

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Problems solved by technology

[0003] Machining and powder metallurgy sintered dual gears have high precision, but their strength is often low, which is difficult to apply in some transmission systems with high mechanical performance requirements; fine blanking formed dual gears have high strength and Precision, but it has a high dependence on fine blanking equipment, and usually requires multiple processes to complete, and the cost of the mold is high; the pendulum rolling process belongs to progressive forming, the forming load is small, and the plasticity of the material is improved when heated, and the complexity of production can be achieved Higher parts, although the formed parts have higher precision and strength, but the processing cycle is longer, and the utilization rate of materials in the billet making process is low

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