A method for joining steel shaft end pieces and aluminum pipe fittings

Abstract

A method for connecting a steel shaft end piece and an aluminum pipe fitting comprises the following steps that first, the steel shaft end piece is machined and formed; second, the steel shaft end piece is inserted into a through hole of the hollow aluminum pipe fitting, wherein the outer end face of an annular groove of the steel shaft end piece and the outer end face of the hollow aluminum pipe fitting are placed in the same straight line; third, a squeezing piece is machined and formed; fourth, the aluminum pipe fitting is squeezed by the squeezing piece in the axial direction of the steel shaft end piece, aluminum on the aluminum pipe fitting is squeezed into the annular groove of the steel shaft end piece, and then the squeezing piece is reset, so that products are manufactured. According to the roller core structure formed through the method, due to the straight-bar-shaped steel shaft end piece, the coaxiality and precision of the structure and the hollow aluminum pipe fitting are improved substantially; for the reason that the squeezing piece with annular protrusions is used for squeezing the aluminum pipe fitting, the aluminum of the end face of the aluminum pipe fitting is squeezed into the steel shaft end piece with the annular groove, the tight fit of the hollow aluminum pipe fitting and the steel shaft end piece is achieved, and therefore the torsional strength and tensile strength of the products are increased.

Description

technical field [0001] The invention relates to the technical field of metal parts joining process, in particular to a joining method of steel shaft end parts and aluminum pipe parts. Background technique [0002] A roll core structure includes a hollow aluminum pipe fitting in the middle and steel shaft end pieces fixed integrally with the aluminum pipe fitting at both ends. [0003] There are mainly two methods for producing the above-mentioned roller core structure in the prior art: one is to directly insert the steel shaft end piece into the through hole of the hollow aluminum pipe fitting, because the outer diameter of the steel shaft end piece is slightly larger than that of the hollow aluminum pipe. The inner diameter of the through hole of the pipe fittings makes the steel shaft end pieces closely match the hollow aluminum pipe fittings. After the roller core structure produced by this method is used for a certain period of time, due to the multiple times friction, ...

AI Technical Summary

Problems solved by technology

[0003] There are mainly two methods for producing the above-mentioned roller core structure in the prior art: one is to directly insert the steel shaft end piece into the through hole of the hollow aluminum pipe fitting, because the outer diameter of the steel shaft end piece is slightly larger than that of the hollow aluminum pipe. The inner diameter of the through hole of the pipe fittings makes the steel shaft end pieces closely match the hollow aluminum pipe fittings. After the roller core structure produced by this method is used for a certain period of time, due to the multiple times friction, it is easy for the steel shaft end piece to separate from the hollow aluminum pipe piece, its torsional strength and tensile strength are low, and its service life is short;

Images