A Machining Method of Involute Lines of Gears with Large Modulus and Small Number of Teeth

Abstract

The invention relates to a processing method of an involute of a gear with large module and a few teeth. The method includes forging process; semi-finish turning processing: processing is performed on a lathe, and inner holes, addendum circles and datum end faces are finished during one clamping; hobbing processing: a standard hob is adopted for the hobbing processing, and a gear grinding allowance in a common normal line is provided; rough gear grinding processing: the whole gear is processed out according to dimensions, corresponding deep arcs are processed at tooth roots according to the common normal line allowance, and the diameter of a starting circle of the involute is measured; carburization quenching processing: carburization quenching is performed on teeth surfaces, non-seeping surfaces are subjected to coating protection; finish turning processing: processing is performed on the lathe, and the datum end faces and the inner holes are finished during one clamping; and gear grinding processing : gear grinding is performed on a gear grinding machine, and the diameter of the starting circle of the involute is measured. The processing method is simple, low in production cost and suitable for processing gears with large module, a few teeth and large negative addendum modification.

Description

technical field [0001] The invention relates to a gear machining method, in particular to a gear involute machining method with a large modulus and a small number of teeth. Background technique [0002] Gear transmission is the most common mechanical transmission in modern machines. It is a main form of transmitting machine power and motion, and is an important basic part of mechanical products. In recent years, power transmission gears are developing in the direction of miniaturization, high speed, low noise and high reliability. In order to improve the load-carrying capacity of gear transmission, the design and manufacture technology of hard-toothed gears has attracted more and more attention. [0003] The main processing procedures of general hard tooth surface gear parts are: forging-rough turning-flaw detection-pretreatment-semi-finished turning-flaw detection-hobbing-heat treatment-finish turning-grinding-flaw detection, etc. Gear cutting includes gear hobbing, milli...

AI Technical Summary

Problems solved by technology

Theoretically, parts of a drawing number (with the same gear parameters) must be ordered with a grinding hob according to the parameters, but for most enterprises, especially private enterprises, they do not have their own products and cannot form batches. The parts are all in one piece and in small batches, which makes it difficult to order hobs. If you order a hob for each drawing number, especially a hob with a large modulus, the cost is too high, so for most enterprises In terms of custom-made gear hobs, they are all common convex hobs, that is, gear parts with the same modulus can be processed with a gear hob, but the same modulus and the number of teeth are different, and the hob rolls out The initial circle radius of the transition curve of the parts is different, and some may not guarantee the effective initial circle radius when the processed gear meshes with the mating gear, especially for parts with large modulus and small number of teeth.