Friction stir welding tool with multi-parameter feedback

Abstract

The invention discloses a friction stir welding tool with multi-parameter feedback. The friction stir welding tool comprises a hollow welder housing, a main motor and a torque sensor arranged in the welder housing, a hollow central shaft extending into the welder housing and connected to the torque sensor, a stirring needle arranged in the central shaft in a sleeved manner, and a stirring needle withdrawing device capable of enabling the stirring needle to axially move along the central shaft. The withdrawing device can smoothly realize withdrawing, during high-speed rotation, of the stirring needle, breaks through the limit that a withdrawing device of a conventional welding tool cannot withdraw the stirring needle in high-speed rotation, successfully solves the keyhole problem in the tail part of a welding seam, and improves welding quality.

Description

technical field [0001] The invention relates to nonferrous metal welding processing technology, in particular to a multi-parameter feedback friction stir welding tool. Background technique [0002] Since the Friction Stir Welding method was invented by the British Welding Institute, this technology can eliminate welding defects such as pores, inclusions, cracks, etc. due to its small welding deformation, small residual stress, no need for protective gas and filling materials, and no arc light, smoke and dust. , noise pollution, etc. At the same time, it can significantly reduce costs, save materials, optimize structures, and reduce the structural weight of aircraft, etc., which have attracted the attention of scientific research institutions in various countries. Because this technology has many remarkable features that other methods do not have, it will soon be used in the aerospace field, and this method is selected for the welding of the longitudinal seam of the core tank...

AI Technical Summary

Problems solved by technology

Although the friction stir welding method can be used to obtain high-quality welded joints, in actual engineering operations, there are often weld defects and "keyholes" at the tail of the weld

[0003] With the rapid development of auxiliary means of welding technology, the development of robot technology is becoming more and more mature, but the existing friction stir welding equipment does not have a measurement and control system, which cannot properly measure the displacement, pressure, torque of the stirring needle and vibration of the friction stir welding machine during the welding process. Control and detection, for example, the existing PID pressure control scheme will cause excessive pressure, cause excessive flash, and there will be a large time lag at the same time, and the effect is not good; at the same time, the existing friction stir welding equipment is generally large in size and weight , it is difficult to install directly on the end of the robot arm

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