Process used for machining inner gear ring with large module and deep tooth space

Abstract

The invention discloses a process used for machining an inner gear ring with large module and deep tooth space, which comprises the steps of forging, normalizing, rough turning, finish turning, gear shaping and gear broaching. For forging, 20CrMnTi material is chosen, an excircle with 4mm of thickness is added, an inner diameter is decreased by 4mm, and the total height is increased by 4mm on the basis of a finished product dimension to form a forging dimension; for normalizing, a gear ring is placed at high temperature for heat preservation for a time period and then drawn from a furnace for air cooling; for rough turning, oxide scale and most of allowances are removed for the air-cooled gear ring, and 0.5mm allowance is left at each side; for finish turning, the thickness of the excircle and the total height of the gear ring after rough turning is processed to the desired dimension through finish turning, and the inner hole has 0.2mm allowance left; for gear shaping, gear shaping is carried out to the inner gear ring of the gear ring after finish turning, and an inter-rod distance dimension is shaped to be 0.4 mm less than that of a finished product; and for gear broaching, finally a tooth shape and the small diameter of the inner gear ring are broached to the finished product dimension to obtain the finished product of the inner gear ring. The process of the invention can effectively improve the gear shape precision and the consistency of gear ring dimensions, and reduce the internal stress of the gear ring.

Description

technical field [0001] The invention relates to a process for machining a large modulus deep tooth groove inner ring gear. Background technique [0002] The tooth shape accuracy of the ring gear has a great influence on the working performance, load capacity, noise and service life of the machine, so it is very important to strictly control the processing tooth shape. There are many ways to process the involute spline internal ring gear, and the commonly used methods are tooth shaping with gear shaping cutter and tooth broaching with broach. The work efficiency of gear shaping is lower than that of broaching teeth, and the consistency of the inner ring gear is poor; the work efficiency of broaching teeth is higher, but the requirements for equipment and tools are relatively high, especially for inner rings with large modulus and deep tooth grooves. For the ring gear, it is unrealistic to shape the teeth at one time, but if the shaper is used, the accuracy cannot be guarante...

AI Technical Summary

Problems solved by technology

The work efficiency of gear shaping is lower than that of broaching teeth, and the consistency of the inner ring gear is poor; the work efficiency of broaching teeth is higher, but the requirements for equipment and tools are relatively high, especially for inner rings with large modulus and deep tooth grooves. For the ring gear, it is unrealistic to shape the teeth at one time, but if the shaper is used, the accuracy cannot be guaranteed.

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