Method for manufacturing intermediate formed body of driven gear of rear axle of small and medium-sized automobile

Abstract

The invention discloses a method for manufacturing an intermediate formed body of a driven gear of a rear axle of a mall and medium-sized automobile, which can improve production efficiency and reduce material consumption. The method comprises the following steps of: upsetting a blank into a workpiece; punching the workpiece and removing connected skin; pre-shaping and reaming the workpiece; and finally performing rolling formation on the workpiece to form the intermediate formed body. Compared with the prior art, the method has the advantages of reducing cutting allowance and saving raw materials because the rolling formation is adopted to eliminate defects that upper and lower end faces are not flat, the ovality of the excircle is large and the like. The upsetting, reaming, connected skin removal and the pre-shaping can be finished by an open crank press; and the open crank press can accurately control the axial height of the workpiece, so that the possibility of generating burrs, fins and the other defects in the processing process is reduced.

Description

technical field [0001] The invention relates to a method for manufacturing an intermediate formed body of a rear axle driven gear of a small and medium-sized automobile. Background technique [0002] Small and medium-sized cars include trucks with a load of less than 2 tons and passenger cars with a passenger capacity of less than 11. The driven gear of the rear axle of small and medium-sized cars is one of the key parts for power transmission of the rear axle main gearbox of small and medium-sized cars. At present, the manufacturing method of the above-mentioned driven gear is: upsetting step-punching step-punching and skinning step-flattening step-vertical reaming machine forming step-finishing step, after passing the finishing step, The intermediate formed body is formed, and then gear teeth are processed on the intermediate formed body by cutting to form the final driven gear. The above-mentioned upsetting step is to upset the billet with a forging hammer to form a proc...

AI Technical Summary

Problems solved by technology

The above-mentioned upsetting step is to upset the billet with a forging hammer to form a processed part. The processed part includes two end faces and a side wall. Because the forging hammer hits the billet, the noise generated is relatively large, resulting in a poor working environment for workers.

The punching step after the upsetting step is to first form a cylindrical punching hole on the workpiece through the cylindrical punch, and the subsequent punching step is to open the punching hole into an inner hole, and the distance between the bottom surface of the cylindrical punching hole The material body between the end faces of the workpiece forms a continuous skin, and the above continuous skin is removed through the punching and continuous skinning step, and the punching is opened to form a cylindrical inner hole, and then formed through the flattening step and the forming step of the vertical reaming machine Forgings similar in shape and size to the intermediate forming body, due to the pits on the end face of the forging processed by the above process, and the forging has a large ellipticity and distortion, compared with the intermediate forming body, the forging will be A certain processing allowance is reserved for the subsequent finishing step to carry out finishing shaping, so that the forging can form an intermediate formed body through the finishing step, which leads to large material consumption and low production efficiency of the intermediate formed body during processing, and, The finishing step will destroy the metal fiber structure inside the forging, making the mechanical properties of the intermediate forming body poor, which leads to poor mechanical properties of the final driven gear

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