Production method of saloon car transmission combination gear ring

Abstract

The invention discloses a production method of a saloon car transmission combination gear ring, which comprises the following steps: (1) warm forging plastic forming; (2) spheroidal annealing; (3) straight tooth cold extrusion; and (4) back taper tooth forming. A warm / cold combined forging forming technique is utilized to form the saloon car transmission combination gear ring. A straight tooth structure is firstly formed, and taper teeth are formed on the basis of the straight tooth structure, so that mechanical cutting subsequent processing is not needed. The toothed metal has complete streamline. The method enhances the strength and comprehensive mechanical properties of the teeth, improves the torque transfer capacity, and enhances the carrying capacity of the gear. The three cold-forging procedures, including cold-forging straight tooth forming, back taper tooth preforming and back taper tooth finish forming, are instantaneously completed on a mechanical press, and thus, the method has the advantages of high production efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of forging, and relates to a warm-cold combined forging forming method for a combined gear ring of a car transmission, in particular to a production process for a hollow, thin-walled inverted cone-shaped combined gear and gear ring of a car transmission. Background technique [0002] The car transmission combined with the toothed ring is mainly used for shifting gears in the car transmission, thereby changing the transmission speed ratio, expanding the range of torque and speed of the driving wheel, so as to adapt to the driving conditions that often change the speed ratio, and at the same time, it can make the engine operate at a higher power. Work with lower fuel consumption. It can be seen that the car transmission combined with the gear ring is a key part of the car transmission. The existing production and processing of car transmission combined with toothed ring is generally after the metal bar is hea...

AI Technical Summary

Problems solved by technology

The car transmission produced by this process is combined with the toothed ring. Because the metal flow line is cut off by mechanical cutting, the comprehensive mechanical properties of the product are reduced, resulting in loose internal structure of the product, poor consistency, and difficulty in ensuring accuracy, which may easily cause gear damage in the car. The phenomenon of not being able to shift gears

Using this method to produce car transmissions combined with gear rings has low production efficiency, waste of metal materials, high production costs, and long production cycles.

The State Intellectual Property Office discloses a compound forging process of front bevel gear bevel teeth and combined teeth CN200410014340.6), including preforms, bevel teeth and combined teeth forming, annealing, cold finishing and other processing processes. The forming process is in The combined die is used on the cold extrusion machine to forge the bevel gear and the combined gear at one time. This solution overcomes the shortcomings of traditional cutting and has a remarkable effect, but the disclosure is not sufficient and the operability is not strong.

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