Stirring sleeve rotation friction heat generation and rivet screwing-in type plate friction rivet welding connection method

Abstract

The invention relates to a stirring sleeve rotation friction heat generation and rivet screwing-in type plate friction rivet welding connection method. The problem of connection of light alloy multi-layer plates is solved. The method mainly comprises the following steps that a stirring head system is integrally pressed downwards to position a novel rivet at a to-be-connected point, and a certain pre-tightening force is applied; a stirring sleeve and a stirring needle rotate according to a set rotating speed, the shaft shoulder of the stirring sleeve and the end face of the novel rivet are severely rubbed with the surface of a light alloy upper plate, and a large amount of friction heat is generated to heat the center area of a light alloy to be in a plasticized state; the stirring sleeve stops rotating, the stirring needle conducts stamping downwards while rotating, and the novel rivet is pressed into the plasticized light alloy multi-layer plate; the stirring needle stops stamping and rotates for a certain time under pressure maintaining, so that the plasticized light alloy is fully filled into a thread groove of the novel rivet, and the novel rivet is wrapped and embedded to form mechanical combination; and the stirring sleeve and the stirring needle stop rotating, the stirring head retreats from the connecting point, and a compact stirring friction rivet welding joint is formed after natural cooling.

Description

technical field [0001] The invention belongs to the field of welding and riveting, and relates to a friction riveting connection method of a stirring sleeve rotating friction heat and a rivet screw-in plate material. Background technique [0002] The conventional connection methods of light alloy multilayer plates mainly include bolt connection, riveting, fusion welding, brazing and solid phase welding, etc., but the air tightness and appearance quality of bolt connection and riveting workpieces are poor, and the appearance quality is poor, and it has not been realized. Metallurgical bonding. The traditional riveting process requires pre-punching the riveting material and then connecting with rivets. Such riveting process is complex, poor in appearance, low in efficiency, poor in sealing performance and difficult to automate. Punch riveting connection can realize the connection of light alloy multilayer plates, and the quality of the connection is better than that of spot w...

AI Technical Summary

Problems solved by technology

[0002] The conventional connection methods of light alloy multilayer plates mainly include bolt connection, riveting, fusion welding, brazing and solid phase welding, etc., but the bolt connection and riveting workpiece Poor air tightness, poor appearance quality, and failure to achieve metallurgical bonding

The traditional riveting process requires pre-punching the riveting material and then connecting with rivets. Such riveting process is complicated, poor in appearance, low in efficiency, poor in sealing performance and difficult to realize automation.

Punch riveting connection can realize the connection of light alloy multilayer plates, and the quality of the connection is better than that of spot welding, but the protruding rivets at the tail are not flush enough during riveting, and can only be connected at a single point; Excessive and difficult to control heat input, seriously affecting the reliability of the joint

Brazing can realize the connection of light alloy multi-layer plates, but the brazing efficiency is low, the process is difficult to control, and there are special requirements for the size and shape of the workpiece, which is not conducive to mass production

Friction Stir Spot Welding (FSSW for short) is a kind of solid-phase welding. Since the matrix remains solid during the connection process, the performance of the joint is generally not limited to intermetallic compounds, and it is more suitable for light alloys. The connection of ply sheets, but exiting the keyhole affects the appearance of the joint and the quality of the joint connection

Therefore, the existing connection methods are difficult to fully meet the requirements for the manufacture of lightweight alloy multilayer sheets in industries such as aerospace, military weapons and equipment, automobiles, and petroleum and petrochemical industries. new technology

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