Joint method of aluminum pipe fitting and steel shaft end fitting

Abstract

The invention discloses a joint method of an aluminum pipe fitting and a steel shaft end fitting, wherein the method comprises the following steps: a steel shaft end fitting is processed and molded, wherein the steel shaft end fitting is axially divided into at least two sections of cylinders by a step, the outer diameter of the first section of the cylinder is slightly less than the inner diameter of a hollow aluminum pipe fitting, and the outer diameter of the second section of the cylinder is slightly greater than the outer diameter of the hollow aluminum pipe fitting; the end surface peripheral part of the connection of the second section of the cylinder and the first section of the cylinder is provided with a reducing thin wall in a protruding mode, and the inner diameter of the reducing thin wall increases gradually towards the direction of the first section of the cylinder. A joint fitting of the aluminum pipe fitting and the steel shaft end fitting, which is molded by adopting the method provided by the invention, not only forms plane shallow joint on the end surface of the aluminum pipe fitting and the end surface of the steel shaft end fitting, but also tight match also exists in the joint part of the aluminum pipe fitting and the steel shaft end fitting, thus the joint intensity is creased, and the joint fitting has a firm joint effect.

Description

technical field [0001] The invention relates to a production method of a metal joining piece, in particular to a joining method of an aluminum pipe piece and a steel shaft end piece. Background technique [0002] see figure 1 , a roll core structure. In order to reduce the weight of the roll core, the middle part is made of hollow steel pipe fittings. In order to ensure the wear resistance and rigidity of the end of the roll mandrel shaft, the two ends of the roll core are made of steel shaft end pieces. The hollow steel pipe The pipe fittings and the steel shaft end pieces are formed into joints that are fixed in one body by friction welding. [0003] In order to further reduce the weight of the roller core, a hollow aluminum pipe is used in the middle, and then it is fixed with two steel shaft ends by friction welding. However, since the melting point of aluminum is much lower than that of steel, the end face of the aluminum pipe fitting and the end face of the steel sha...

AI Technical Summary

Problems solved by technology

However, since the melting point of aluminum is much lower than that of steel, the end face of the aluminum pipe fitting and the end face of the steel shaft end piece cannot be in a molten state at the same time during the friction welding process, resulting in the jointed roll core being only in the aluminum The end surface of the pipe fitting and the end surface of the steel shaft end piece form a shallow joint in the form of a plane. The joint strength of the joint of the roll core is weak, easy to split, and the bending resistance is poor, which cannot meet the normal use requirements of the roll core.

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