A kind of design and manufacture method of involute spline broach teeth

Abstract

The invention discloses a designing and manufacturing method for teeth of an involute spline broach. The designing and manufacturing method for the teeth of the involute spline broach comprises the steps that firstly, the tooth rise Sz of each tooth is determined according to parameters of a machined part; secondly, the lifting quantity coz of each tooth is determined according to the tooth rise Sz of the tooth; thirdly, an involute space curve of the teeth of the broach in the machining and grinding state is determined; and fourthly, a curve passing through the coordinate points of the involute space curve is drawn to serve as an involute space curve of the broach in the grinding state, and the teeth of the involute spline broach are obtained by conducting machining according to the involute space curve of the broach in the machining and grinding state. Since the designing and manufacturing method is based on the gradual cutting type broaching principle and machining is conducted on the basis that the involute space curve of the broach in the machining and grinding state is determined, the procedure of shoveling and grinding a rear corner during subsequent machining of a forming type broaching tool can be omitted, the broach machining process is simplified, the machining difficulty is lowered, and the producing and manufacturing cost is greatly reduced accordingly.

Description

technical field [0001] The invention belongs to the technical field of cutting tools, and relates to an involute spline broaching tool, in particular to a method for designing and manufacturing the teeth of an involute spline broach. Background technique [0002] Involute splines (such as figure 1 (shown) due to its large number of teeth, wide and thick tooth ends and roots, strong bearing capacity, easy self-centering, high installation accuracy, etc., the involute spline is widely used. However, the processing difficulty of involute spline is relatively high, and it is mainly prepared by broaching process through involute spline broach. Involute spline broach integrated structure, such as figure 2 As shown, it includes a clamping part 1, a front guide part 2, a cutting tooth part 3, a correction tooth part 4, and a rear guide part 5; at present, broaches for processing involute splines are mainly based on the principle of forming broaching, Make the comprehensive profi...

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Problems solved by technology

[0003] Although the processing accuracy of this involute spline broach based on the principle of forming broaching is relatively high, the design and processing process of this broach is quite complicated and the cost is very high. Therefore, the tooth pitch of the broach is very long, and the length of the broach increases; the lift of the single tooth of the broach is also small

In addition, although this involute spline broach based on the principle of forming broaching has high machining accuracy, due to the small tooth lift of a single tooth, the number of teeth of the broach increases, the length of the broach increases, and the number of broaches increases. Its broaching efficiency is relatively low

However, in the field of mechanical processing, there are many involute spline parts that do not require very high processing accuracy, and broaches with low processing accuracy can be used for processing. Open-line spline broach for processing, low broaching efficiency and high processing cost

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