High-rotating-speed stirring friction adjusting method and welding tool with adjustable axial force of stirring needle

Abstract

The invention discloses a high-rotating-speed stirring friction adjusting method and welding tool with adjustable axial force of a stirring needle, and belongs to the technical field of welding equipment. The high-rotating-speed stirring friction adjusting welding tool comprises a stepping motor, a connecting rod, a linear bearing, a connecting plate, a pressing ball, a ball bearing, a ball bearing connecting body, a T-shaped device, a fixing device, an electric main shaft, a bushing, a stirring needle connecting rod, a stirring needle and a shaft shoulder. Downward pressure is applied to thepressing ball through the stepping motor, upward elastic force is applied to the ball bearing connecting body through a spring, the devices are matched with each other, the pressing ball and the ballbearing are connected in a non-fastening mode, and axial displacement of the stirring needle is achieved. The real-time axial force of the stirring needle is obtained by subtracting the product of theelastic coefficient of the spring and the compression amount from the value measured by a pressure sensor mounted at the top end of a push rod of the stepping motor. The welding tool has the beneficial effects that the axial force of the stirring needle can be measured in real time, the compression type connection structure is simple, the tolerance is high, and a keyhole caused by high-rotating-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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