A Spindle System Realizing Friction Overlay Welding with Shaft Shoulder

Abstract

The invention discloses a spindle system for realizing friction surfacing with a shaft shoulder. The spindle system comprises a round bar consumable, a cylindrical shell, a hollow spindle, a shaft sleeve, a self-locking clamping mechanism and a rigid shaft sleeve, wherein the hollow spindle is coaxial with the cylindrical shell and is arranged in the cylindrical shell, and the shaft sleeve slides up and down along an inner hole of the hollow spindle; and the self-locking clamping mechanism is fixed to the lower end of the hollow spindle. The upper end of the round bar consumable is fixed to the shaft sleeve, and the lower end of the round bar consumable contacts with the surface of a workpiece through the self-locking clamping mechanism and the rigid shaft sleeve. When the hollow spindle rotates at high speed, the round bar consumable and the rigid shaft sleeve are driven by the shaft sleeve and the self-locking clamping mechanism at the lower end to rotate at high speed, and the shaft sleeve moves down along the hollow spindle at the same time, so that the round bar consumable rotates at high speed while can move down along the axial direction. The rigid shaft sleeve plays a role of friction and extrusion without consuming the shaft shoulder, and therefore the friction surfacing process with the shaft shoulder is realized. The spindle system can improve the use ratio of the round bar consumable and effectively eliminates the weak connection defect of the edge of a traditional friction surfacing layer, and thereby obtaining the friction surfacing layer with a good mechanical property.

Description

technical field [0001] The invention belongs to the technical field of solid-phase friction welding, and in particular relates to a spindle system for realizing friction surfacing with shoulders. Background technique [0002] Friction surfacing welding is a special material surface surfacing and processing technology. It is an advanced technology that uses the principle of friction welding to realize the material surfacing process. Such as figure 1 As shown, the main principle of friction surfacing welding is described as follows: first, the material to be surfacing is processed into a certain size round bar consumable 2, and secondly, a high-speed rotation is applied to the round bar consumable, and a certain axial upsetting pressure is applied while rotating at a high speed ; In this way, under the joint action of high-speed rotation and axial pressure, when the round rod consumable 2 is in contact with the substrate surface 1, a large amount of frictional heating will in...

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Problems solved by technology

[0005] However, the following main problems still exist in the traditional friction surfacing process: (1) The utilization rate of round bar consumables is low

(2) The interface connection strength of the surfacing layer is uneven, the central area is high and the connection strength at the two edges is significantly reduced and weak connection defects are prone to occur

Therefore, the edge of the traditional surfacing layer is prone to weak connection defects, and the connection strength is low

Especially in the case of multi-pass surfacing welding, the subsequent surfacing welding seam needs to overlap the edge of the previous welding seam to improve the connection strength of the entire surfacing welding layer, but in some cases it is still not possible to completely eliminate the relationship between the surfacing welding layer edge and the base layer. Unwelded defects on the surface of the material will have a serious impact on the welding quality of the entire surfacing layer

[0006] In order to obtain a good connection strength of the surfacing layer, it is necessary to use machining methods to cut off the unwelded areas of the two edges of the front surfacing welding seam before performing adjacent weld surfacing welding, which not only further wastes the surfacing welding material And it complicates the surfacing process, and makes it difficult for friction surfacing technology to be applied to the preparation of large-area surfacing layers on the surface of substrates in engineering

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