Four-motor direct drive type alternating current servo punching and riveting device and punching and riveting machine for friction stir rivet welding of multiple layers of plates

Abstract

The invention relates to a four-motor direct drive type alternating current servo punching and riveting device for friction stir rivet welding of multiple layers of plates. The four-motor direct drive type alternating current servo punching and riveting device comprises a stirring sleeve rotating system, a stirring needle rotating system, a stirring needle punching system and a stirring head system. A rotor of a first torque motor directly drives a stirring sleeve chuck through a first hollow main shaft so as to realize rotary motion; a bearing sleeve is used for axially driving an ejector pin; the stirring needle rotating system comprises a first alternating current servo motor and a spline shaft; the alternating-current servo motor drives the spline shaft, and the spline shaft is connected with the ejector pin through a spline pair to achieve rotation of the ejector pin and maintain the axial freedom degree of the ejector pin. According to the four-motor direct drive type alternating current servo punching and riveting device, any cooperation of stirring sleeve rotation, stirring needle rotation and stirring needle stamping can be achieved, a keyhole withdrawing defect left by the friction stir spot welding process can be overcome, mechanical combination is added on the basis of metallurgical combination, and a rivet welding connection point which is high in connection strength, good in appearance quality and tight in connection can be obtained.

Description

technical field [0001] The invention belongs to the field of AC servo punching riveting equipment, and relates to a four-motor direct-drive AC servo punching riveting device and a punching riveting machine for friction stir riveting welding of multi-layer plates. Background technique [0002] Conventional connection methods for multilayer sheets mainly include bolted connection, riveting, fusion welding, brazing and solid-phase welding, etc., but the air tightness and appearance quality of bolted and riveted workpieces are poor, and the metallurgical combined. The traditional riveting process requires pre-punching the riveting material and then fixing it with rivets. Such a riveting process is complicated, has poor appearance, low efficiency, poor sealing performance and is not easy to automate. Punch riveting can realize the connection of multi-layer plates, and the connection quality is better than that of spot welding, but the protruding rivets at the end of riveting are...

AI Technical Summary

Problems solved by technology

[0004] Zhou Li of Harbin Institute of Technology and others developed a backfill friction stir spot welding device, which can withdraw and rotate the stirring needle and the stirring sleeve. Step-by-step rotation and individual rotation control, and the stamping system of the stirring needle and the stirring sleeve are all transmitted by the servo motor through the pulley and the hollow ball screw. The transmission mechanism is too complicated, the transmission efficiency is low, and the precision control is poor.

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