Friction stir welding apparatus

Abstract

The present invention provides a friction stir welding apparatus which is vertically movable with respect to a processing target side surface of a processing target member, The friction stir welding apparatus is provided with a displacement detecting device that detects displacement of the welding tool caused by deformation of the fitting jig, at a time of performing friction stir welding in which the arm is moved to move the welding tool with respect to the processing target member, while stirring the processing target member by rotating the probe with respect to the processing target member and pressing the probe to intrude into the processing target member, in which the fitting jig can be deformed more than the arm at the time of performing friction stir welding, and in which the displacement detecting device has a displacement sensor fixed to the welding tool, and a reference member fixed to a fixing portion between the fitting jig and the arm to provide a reference position at a time of detecting the displacement to the displacement sensor.

Description

technical field [0001] The present invention relates to a friction stir welding device, in particular to a friction stir welding device with a displacement detection device. Background technique [0002] In recent years, the following friction stir welding apparatus has been proposed: on the basis of general arc welding, etc., a probe that rotates at a high speed is subjected to friction stirring at a predetermined joint portion of a workpiece member composed of a plurality of metal plates such as an aluminum plate. The metal plates are joined to each other, and even in a strength member of a mobile body such as an automobile, a structure having a joint portion joined by a friction stir welding device can be realized. [0003] In the above-mentioned friction stir welding apparatus, it is necessary to relatively move the probe and the object to be processed so as to accurately join the predetermined joining portion, so that the probe and the object to be processed are relativ...

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Problems solved by technology

[0006] However, according to the research of the present inventors, in Japanese Patent Application Laid-Open No. 6-87075, although the following structure is disclosed: the time is determined by the distance measuring sensors 15, 16 and 17 provided on the left and right sides and the front surface of the welding lamp 1. The distance between the welding lamp 1 and the workpiece 2 is measured, and the control is performed based on the measured value so that the relative left and right angles and front and rear angles of the welding lamp 1 relative to the workpiece 2 can be maintained at predetermined angles respectively, and, by means of The welding lamp inclination measurement sensor 18 provided on the top of the welding lamp 1 measures the absolute angle of the left and right and the absolute angle of the front and rear of the welding lamp 1 at all times, and distinguishes the absolute angle of the welding lamp 1 from the measured value. Among the welding conditions, the most appropriate welding condition corresponding to the absolute angle of the welding lamp 1 is selected and controlled. and no revelation

[0007] In addition, according to the research of the present inventors, in Japanese Patent Laid-Open No. 2004-136365, although the following structure is disclosed: the deflection correction data storage unit 42 stores the deflection amount obtained in advance based on the actual measurement value or its supplementary value. δ is databased and stored, and the actual measurement values ​​are obtained by actually measuring the deflection δ when the bonding tool 21 applies a plurality of different pressing forces F1 to the supporting tool 30 via the object 22. The distance acquisition unit 44 calculates the inter-tool distance D3 based on the detection result of the tool movement amount detection unit 40 and the extraction result of the deflection amount calculation unit 45. direction, the deflection amount calculation unit 45 extracts the deflection amount δ from the deflection correction data storage unit 42 based on the detection result from the pressure detection unit 41, which is used to detect the bonding tool 21, the pressing force F1 applied to the object 22 to be joined, the control unit 48 controls the tool rotation driving unit 24 and the tool shifting driving unit 25 according to the distance D3 between tools calculated in this way, thereby adjusting the pressing force F1 of the bonding tool 21, so that The bonding tool 21 sinks into the workpiece 22 until it becomes the target distance D4 between tools. However, it is necessary to calculate the amount of deflection obtained in advance from the actual measured value obtained by actually measuring the amount of deflection δ or their supplementary value. δ is databased and stored, and its structure is relatively complicated

In particular, for a variety of parts to be processed with different shapes of parts to be subjected to friction stir welding, it is almost impossible to database and prepare the optimum deflection amount δ every time. room for improvement

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