Pre-quenching processing method for carburizing and quenching gears

Abstract

The invention relates to the gear machining field, and discloses a machining method for a root of a gear to be carburized and quenched. The machining method comprises the following steps that during the rough tooth punching of a disc milling cutter is carried out, the same modulus gears share the disc milling cutter, the parameters of the gears to be machined with the minimum teeth number and themaximum teeth number in the same modulus which are often encountered during machining are found out, the average pressure angle of the gear with the minimum teeth number and the average pressure angleof the gear with the maximum teeth number are calculated, the intermediate value of the pressure angle is obtained, the disc milling cutter is selected according to the intermediate value of the pressure angle and the modulus, the disc milling cutter is used for machining the the same modulus gears; and a before-grinding allowance hobbing cutter is further used for machining gear blanks. According to the machining method used before quenching of the gear to be carburized and quenched, the allowance during the rough tooth punching of the disc milling cutter can be cut more greatly, the machining amount of the before-grinding allowance hobbing cutter can be reduced, the machining efficiency can be further improved and the machining cycle can be shortened.

Description

Technical field [0001] The invention relates to the field of gear processing, in particular to a method for processing carburizing and quenching gear roots. Background technique [0002] In order to increase the hardness of the tooth base of the meshing gear and improve the accuracy of the gear, most of the gears and gear shafts are now carburized and quenched, and the teeth are ground in the subsequent processing. [0003] Such as figure 1 As shown, the arc at the root of the gear is to reduce the root cracks due to stress concentration during carburizing and quenching, and also to prevent the grinding wheel from colliding with the tooth part of the gear during grinding, increasing the grinding load of the grinding wheel, and processing the tooth surface Quality has a negative impact. [0004] The arc at the root of the gear is processed by a hob with a convex corner, commonly known as a hob before grinding. The lobe design of the tool is not only based on the tooth profile of the...

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Problems solved by technology

This method can also be used for reference for the rough tooth opening of the disc milling cutter. Using the same disc milling cutter with the same modulus and pressure angle can reduce the cost of the disc milling cutter to a certain extent, but there is still room for further improvement on this basis

[0011] Second, when applying the method of rough tooth opening with disc milling cutter first and then finishing with hob cutter to the pre-quenching processing of carburizing and quenching gears, in order to meet the requirements of subsequent quenching and gear grinding, it is necessary to process the arc at the root of the gear , to prevent stress concentration during quenching from causing cracks at the root and the grinding wheel colliding with the tooth part of the gear during gear grinding. However, the existing carburized and quenched gears use a hob with a convex angle before grinding to process the arc of the root. Tooth overhang can be very long, cutting loads are heavy, tool chatter occurs, stability is low and cutting times are long

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