A high-speed friction stir adjustment method and welding tool with adjustable axial force of the stirring pin

Abstract

A high-speed stirring friction adjustment method with adjustable axial force of a stirring pin and a welding tool, which belong to the technical field of welding equipment. It includes stepper motor, connecting rod, linear bearing, connecting plate, pressure ball, ball bearing, ball bearing connecting body, T-shaped device, fixing device, electric spindle, bushing, stirring pin connecting rod, stirring pin and shaft shoulder. The stepper motor exerts downward pressure on the pressure ball and the spring exerts an upward elastic force on the ball bearing connecting body, and the devices cooperate with each other so that the pressure ball and the ball bearing are not tightly connected to realize the axial displacement of the stirring needle. The real-time axial force of the stirring needle: the value measured by the pressure sensor installed on the top of the stepping motor push rod minus the value of the product of the elastic coefficient of the spring and the compression amount. The beneficial effect is that the axial force of the stirring needle can be measured in real time, the compression connection structure is simple and the tolerance is high, and the keyhole caused by the high-speed friction stir welding can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of welding equipment, and in particular relates to a high-speed stirring friction adjustment method with adjustable axial force of a stirring pin and a welding tool. Background technique [0002] Friction stir welding is a solid phase joining technique. The lifting of the stirring needle at the end of welding will leave a keyhole at the end of the weld, and it is very necessary to solve the keyhole problem in the engineering application process. At present, when friction stir welding is performed on thin plates, the welding method with a fixed stirring pin is mainly used, and the keyhole problem is still a major technical problem. The filling method of fusion welding, due to the high welding heat input, results in poor mechanical properties of the weld structure and large deformation of the thin plate; the filling friction stir welding method requires a large pressure to press the stopper into the rotation ...

AI Technical Summary

Problems solved by technology

Therefore, the main problems of the current retraction device are: (1) The thin plate needs more precise gears to control the displacement, and the gears are easily damaged, which is not suitable for high-speed stirring, grinding and welding; (2) The retraction device has a large volume and a large moment of inertia , cannot reach high speed, and is not suitable for high-speed friction stir welding; (3) The coupling has a gap, which is acceptable for thick plate welding, but has low tolerance for thin plates, and is not suitable for high-speed friction stir welding

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