Pressure-controlled friction stir welding main shaft head device

Abstract

The invention discloses a pressure-controlled friction stir welding main shaft head device which mainly comprises a hydraulic system, a main shaft oil cylinder outer casing and a main shaft piston mechanism, wherein the main shaft oil cylinder outer casing is formed by a front casing and a rear casing which are coaxially connected; the main shaft piston mechanism comprises a main shaft oil cylinder inner casing and a rotating shaft arranged in the main shaft oil cylinder inner casing; the rear end of the rotating shaft is connected with a sliding coupler through a spline shaft; a displacement sensor is arranged between the main shaft oil cylinder outer casing and the main shaft oil cylinder inner casing; a limiting block is arranged between the main shaft oil cylinder outer casing and the main shaft oil cylinder inner casing; a revolution speed transducer is arranged on the sliding coupler; and the length of the spline shaft is larger than the sum of the lengths of the distance between two axial travel spacing steps and a spline connection section. Compared with a structure of a main shaft used in a conventionally disclosed friction stir welding device, the main shaft head device has the characteristics that the dimension is small, the structure is simple, the integration level is high, a rotation driving manner is flexible, the pressure control principle is simple and accurate, and the like.

Description

technical field [0001] The invention belongs to the field of welding equipment manufacturing engineering for metal material processing, and specifically relates to a pressure-controlled friction stir spot welding and friction stir seam welding spindle head device for welding nonferrous metals such as aluminum and magnesium and their alloys. Background technique [0002] Friction Stir Welding (Friction Stir Welding-FSW) is a solid-phase friction welding technology invented by The Welding Institute-TWI in 1991. It is mainly used for non-ferrous metals such as aluminum and magnesium alloys, copper and titanium alloys. Alloy connections. FSW has many advantages that cannot be compared with traditional fusion welding methods: for example, the welding process does not require groove preparation, filler metal and shielding gas; the quality and mechanical properties of welded joints have been significantly improved; welding deformation is small, low defect levels and high production...

AI Technical Summary

Problems solved by technology

[0005] At present, the pressure control friction stir welding equipment disclosed in the foreign market adopts the structural method of separating the load applying device from the spindle head, and its FSW equipment structure and control mechanism are relatively complicated; while the domestic friction stir welding equipment manufacturer: Beijing Saifusi The friction stir welding equipment released on the market by Special Technology Co., Ltd. (authorized by TWI in 2002) and Shanghai Aerospace Equipment Manufacturing General Factory (authorized by TWI in 2010) are both displacement control mode to apply axial upsetting pressure, and the welding process is established On the basis of friction stir welding equipment in displacement control mode, this leads to obvious limitations in domestic FSW welding equipment automation, process and welding processing efficiency, and weld quality control.

Images