Precision forging technology of tooth forms of duplex straight toothed spur gears

Abstract

A precision forging technology of tooth forms of duplex straight toothed spur gears is characterized in that a forging technology and a closed forging die are used to manufacture all the tooth forms of two-stage step cylindrical gears of a duplex straight toothed spur gear; according to the forging technology, a round cake blank is used for one-time heating, all the tooth forms are forged and formed at a time, the forging die structure for precision die forging is of a closed impression structure, a tooth-form female die is of a big-end-up split structure, a die upper punch is a split tooth-form male die, a die lower punch is a tooth-form cushion type die and also serves as an unloading die, and the dies are guided and positioned through four sets of guiding pillars and guiding sleeves. The technological process of forging includes the steps that material is prepared and heated, forging is performed on a no-bottom-dead-centre screw press or a die forging press with the closed impression forging die, hot forged pieces are inspected and cooled, two end faces and inner holes are mechanically machined, gear products are subjected to cementation heat treatment, the gear products are finally inspected, and products are packaged and put in storage.

Description

Technical field [0001] The invention discloses a tooth profile precision forging process of double-connected spur gears, which belongs to the technical field of forging process in the machinery manufacturing industry. Background technique [0002] Double spur gears are widely used in various gear transmission mechanisms in the machinery industry of the basic industry. Now this kind of gear is produced at home and abroad, almost all of which adopt the forging process to forge the gear blank, and then use the machining process of the gear hobbing machine or the gear shaping machine to process and manufacture the tooth profile of the double spur gear. This is the traditional stable duplex spur gear manufacturing process. However, the traditional manufacturing method of double spur gears by machining has inherent defects: first, the material utilization rate of double spur gears is low, because the metal between the two teeth of the machined tooth shape is cut off At the same ...

AI Technical Summary

Problems solved by technology

However, the traditional manufacturing method of machining double-toothed spur gears has inherent defects: first, the material utilization rate of double-toothed spur gears is low, because the metal between the two teeth of the machined tooth profile is cut off At the same time, it is necessary to leave a machining allowance for the outer circle of the gear blank, so compared with the forged tooth shape, 35%-45% of the material needs to be wasted, and the material utilization rate of the large modulus gear is lower; the second is to use machining Process processing and manufacturing of double spur spur gear tooth shape, because the metal fiber between the two teeth is cut off, so the mechanical strength of the gear equivalent to the forged tooth shape is much worse

The 3rd, production efficiency is very low, with machining technology processing and manufacturing duplex spur gear tooth shape, be 4 with the present embodiment gear modulus, the big end gear tooth number of duplex spur gear is 30 teeth, and tooth thickness is 20mm, the number of small-end gear teeth is 15, and the tooth thickness is 30mm. Whether it is processed by gear hobbing machine or gear shaping machine, it takes more than 45 minutes

In other words, the disadvantages of manufacturing "double spur spur gear tooth shape" by mechanical processing technology are: high material consumption quota, high comprehensive energy consumption, low production efficiency, and low gear meshing strength

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