Precise forging method for automobile driven spiral bevel gear

Abstract

The invention discloses a precise forging method for an automobile driven spiral bevel gear, which comprises: molding a precision forging by subjecting a cylindrical rod blank heated to a forging temperature to upsetting, punching, broaching, ring rolling, swing rolling molding, correcting and other processes, finely finishing the toothed part of the molded forging and completing a production process, wherein the forging temperature of the cylindrical rod blank is 1,120 to 1,200 DEG C, and a preheating temperature of the swing rolling die is 250 to 360 DEG C. The method has the advantages that: the production equipment requires a smaller investment and is more economic; less blank metal is used and raw material is saved; die machines more easily, the service life of the die is prolonged, and expensive die material is saved; and the gear precision of the forging blank is guaranteed, the machining of the toothed part is accelerated, and the mechanical performance, especially strength, of the gear is enhanced.

Description

technical field [0001] The invention relates to a precision forging method for passive spiral bevel gears of automobiles, in particular to the field of material processing engineering metal plastic forming used for forming precision forging blanks of passive spiral bevel gears with teeth and similar rings or end faces with shape and precision requirements parts. Background technique [0002] The product corresponding to the present invention is an important part of the automobile axle that bears heavy transmission loads—passive spiral bevel gears; the main failure mode of this type of product is broken teeth, and the main cause of failure is the lack of strength of the teeth; currently this type of product The core processing technology is: the secondary gear cutting process of the ring-shaped finished car blank. Almost all the gear cutting equipment are imported from abroad. The disadvantages are: high production cost, long production time for a single piece, low production...

AI Technical Summary

Problems solved by technology

[0002] The product corresponding to the present invention is an important part of the automobile axle that bears heavy transmission loads—passive spiral bevel gears; the main failure mode of this type of product is broken teeth, and the main cause of failure is the lack of strength of the teeth; currently this type of product The core processing technology is: the secondary gear cutting process of the ring-shaped finished car blank. Almost all the gear cutting equipment are imported from abroad. The disadvantages are: high production cost, long production time for a single piece, low production efficiency, and metal flow in the tooth The wire is cut off, resulting in a decrease in strength; ring-shaped finish blanks are generally prepared by free forging and turning processes, and the material utilization rate is low

Therefore, both at home and abroad are researching new processing technologies, hoping to obtain a consensus on precision forging blanks with teeth. Some people have proposed the technology of overall precision forging, but it is limited by the large tonnage of equipment, huge investment, and unbalanced force on the mold. There are problems such as low mold life

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