Internal spline shaft and preparation method thereof

Abstract

The invention discloses an internal spline shaft and a preparation method thereof. The internal spline shaft comprises a head part and a tail part, and the head part and the tail part are connected through friction welding. The preparation method comprises the following steps of: preparing a head part blank of the internal spline shaft by using alloy steel subjected to hardening and tempering; carrying out nitriding or carburizing treatment on the head part blank; pressing a core shaft in an internal spline of the head part blank to carry out coarse grinding; preparing a tail part blank of the internal spline shaft by using alloy steel; carrying out friction welding on the head part blank and the tail part blank so as to form an integral structure; and pressing a core shaft into an internal spline of the head part of the integral structure, and then carrying out cylindrical grinding processing on the integral structure by using a double-centre method so as to obtain a finished product. The internal spline shaft disclosed by the invention is obtained directly by way of two-section friction welding; the internal spline shaft is simpler in process, high in precision and long in service life; the preparation method is high in production efficiency, and a spline tooth is processed by using a broaching machine, thereby effectively ensuring the precision of the spline; and the heat treatment mode of the internal spline shaft is a nitriding or carburizing mode, so that the contradiction between the surface hardness and the core strength of the spline tooth is solved.

Description

technical field [0001] The invention relates to a transmission shaft and a processing method thereof, in particular to one of the transmission shafts, that is, an internal spline shaft and a preparation method thereof. Background technique [0002] As a type of transmission shaft, the internal spline shaft has been widely used in the industrial field due to its large transmission force and uniform torque distribution, especially for the transmission shaft on the servo motor, the internal spline has become the first choice transmission mode, but there are many technical problems that need to be solved during the processing of the internal spline shaft. The existing internal spline shaft such as figure 1 and figure 2 , figure 1 The inner spline shaft in is machined as a whole. figure 2 The inner spline shaft includes the head 1' and the tail 2', the middle taper pin 3' connects the head 1' and the tail 2' through dynamic fit and glue, and the head 1' has spline teeth in ...

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the disadvantages of low machining accuracy and short service life of the prepared internal spline shaft in the existing preparation method of the internal spline shaft, the present invention provides a new internal spline shaft and a preparation method of the internal spline shaft. The prepared internal spline shaft has high precision and long service life

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