An integral circular seam friction stir welding device and welding method for a large storage tank

Abstract

The invention discloses an overall circumferential weld friction-stir welding device and welding method of a large-scale storage box. The device comprises a rotary type head frame, a rotary type circumferential weld clamp, a rotary type tail frame, numerical-control supporting carrier rollers, a machine tool base and a welding execution mechanism, the inner portion and the outer portion of a weld joint of a to-be-welded workpiece are clamped through the rotary type circumferential weld clamp, the two end faces, besides the weld joint, of the to-be-welded workpiece are connected with the rotary type head frame and the rotary type tail frame respectively, the rotary type circumferential weld clamp, the rotary type head frame and the rotary type tail frame synchronously rotate to drive the workpiece to rotate, a servo electric main shaft drives a rotational stirring needle to be punched into the weld joint of the to-be-welded workpiece, rotating of the workpiece is matched, and therefore circumferential weld friction-stir welding of the large-scale storage box can be achieved. According to the device, overall circumferential weld friction-stir welding of the large-scale storage box can be precisely achieved, the device integrates milling, welding, measuring and other functions, a multi-axis numerical control system is adopted to coordinately control servo shafts, and the high-precision, high-efficiency and high-reliability welding requirement of the storage box can be met.

Description

technical field [0001] The invention relates to the field of advanced aerospace manufacturing, in particular to a friction stir welding device and a welding method for an integral annular seam of a large storage tank. Background technique [0002] Aircraft cabins such as rocket body cabins of launch vehicles and aircraft fuselage shells are composed of large thin-walled cylindrical members, and the connections between the thin-walled cylindrical members are realized by friction stir welding. [0003] During friction stir welding, the barrel member will bear a large welding pressure and friction force. Due to the poor rigidity of the large thin-walled barrel member, the barrel member will have a large deformation during welding, which seriously affects the welding quality of the member. Therefore, the friction stir welding equipment should include a support device with better rigidity, and use the support device to reduce the deformation of the barrel section when it is subje...

AI Technical Summary

Problems solved by technology

[0004] The traditional friction stir welding device for circumferential seam of large-scale tubular members adopts the support device and the workpiece rotating device to rotate synchronously. In actual processing, the workpiece rotates once, which is easy to cause wire winding. If the workpiece rotates reciprocally within a certain angle range, the welding efficiency will be reduced. quality also drops

Therefore, the traditional friction stir welding device for the circular seam of large-scale cylindrical members can no longer achieve high-efficiency and high-quality welding.

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