Resistance-heating-assisted friction stir welding tool

Abstract

The invention discloses a resistance-heating-assisted friction stir welding tool. The resistance-heating-assisted friction stir welding tool comprises a power chamber outer shell. A first supporting plate and a second supporting plate are sequentially arranged in the power chamber outer shell. The first supporting plate is provided with a main motor. The second supporting plate is provided with a dynamic torque sensor. A central shaft is connected with an inner shaft. The inner shaft is connected with a stirring head shaft shoulder. The central shaft is sleeved with a bearing. The bearing is located in a supporting chamber outer shell, and the supporting chamber outer shell is fixed to the second supporting plate. The second supporting plate is connected with a heating-assisting device outer shell, and a heating-assisting device used for heating the stirring head shaft shoulder is installed in the heating-assisting device outer shell. The heating-assisting device is equivalent to providing a new heat input for a welded workpiece, the welded metal is made to reach a viscoplastic state soon, the preheating time for the workpiece by a stirring head is greatly shortened, and meanwhile abrasion to the stirring head is relieved. The resistance-heating-assisted friction stir welding tool has important practical application meaning for friction stir welding of high-melting-point and high-hardness metal.

Description

technical field [0001] The invention relates to a friction stir welding tool with resistance auxiliary heating, which belongs to the field of welding. Background technique [0002] Since the British Welding Institute (TWI) invented the friction stir welding method in 1911, this technology can eliminate welding defects such as pores, inclusions, cracks, etc. And it does not produce arc light, smoke, noise pollution, etc., and at the same time 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 section of the new generation of launch vehicles. Although the friction stir welding method can be used to obtai...

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

With the rapid development of auxiliary means of welding technology, the development of robot technology is becoming more and more mature, but the current friction stir welding equipment is generally large in size and weight, and it is difficult to directly install it on the end of the robot arm; in addition, the existing friction stir welding equipment has no measurement control system, unable to properly detect and control the torque, axial force and welding tool posture during the welding process

[0003] The patent (CN 104139240A) proposes a retractable double-shaft stirring head, but does not propose a specific method for how to retract the high-speed rotating stirring needle; the patent (CN 104475965A) proposes a friction stir welding device, and the torque motor stator is fixed Installed in the inner hole of the main shaft, the volume of the whole device is too large. In addition, the retraction motor and reducer are not installed coaxially with the torque motor. The retraction device uses a belt for torque transmission, so that the center of gravity of the entire device is not on the central axis, which affects Application on the welding robot arm; if the hydraulic servo control is used, there are more disadvantages such as difficult maintenance, easy leakage, low overload capacity, and loud noise.

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