JP2006198653A - Attaching/detaching device of joining tool for friction stirring and joining - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attaching/detaching device of a joining tool for friction stirring and joining which is safe even during the power failure and compact by maintaining a holder of the joining tool in a retracted condition by the spring force of a coned disk spring, and providing an actuator for detachment behind a stirring motor to release the retracted condition of the joining tool. <P>SOLUTION: In the attaching/detaching device of the joining tool for friction stirring and joining, a tapered hole 7 to fit a holder of the joining tool 2 is formed in an output shaft 5 of a stirring motor 3, and a stepped part 8 is formed on a rear end side of the holder. The stepped part and an attachable/detachable retracting claw 9 are connected to one end side of a retraction force generating unit 11 making use of a coned disk spring 10 urged to the backward of the output shaft, and a projection part 13 projecting from an actuator 12 for detachment provided behind the stirring motor faces the other end side of the retraction force generating unit to release the spring force of the coned disk spring by the projection part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is an apparatus for softening and agitating a workpiece by frictional heat caused by rotation of a pin, and joining the agitating motor and the joining tool for rotating the joining tool having a pin. The present invention relates to a joining tool engaging / disengaging device in a friction stir welding device provided with a pressurizing motor.

  Conventionally, a device that softens and agitates the workpieces by frictional heat generated by the rotation of the pin, and agitating motor that rotates the joining tool having the pin and a drive that linearly drives the joining tool. In a friction stir welding apparatus equipped with a pressure motor, a rotary tool, which is a welding tool, is wedge-shaped by an air cylinder provided in a tool attachment / detachment actuator separately from the friction stir welding apparatus. When the tool is put in and out of the gun and removed from the stirring shaft of the gun, and the tool is attached to the gun, the taper of the tool is inserted into the stirring shaft of the gun and the robot or the air cylinder Thus, there is one in which a locking portion provided at the end of the tool is engaged with a claw piece on the stirring shaft side to hold the tool on the gun (see, for example, Patent Document 1).

JP 2004-136347 A

  By the way, in the above conventional technique, the joining tool rotates at a high speed, and the tool rotating at a high speed is simply attached to the stirring shaft at the taper portion. Since the engaging part of the part is merely engaged without being pulled by the claw piece on the stirring shaft side, it is joined when the friction stir welding device contacts a jig or the like while moving to the next joining point. There is a danger that the tool can be easily detached from the main body and the tool rotating at high speed can scatter and fall on the people around it, causing a disaster. In addition, it is expected that the tool is inserted with foreign matter mixed in the taper part. In this case, the taper part is not properly fitted, and the taper friction does not work, which is dangerous. There is a problem.

  The present invention has been made in view of the above-described problems of the prior art. The object of the present invention is to maintain the joining tool holder in the retracted state by the spring force of the disc spring, and to stir. By providing a release actuator on the rear side of the motor and releasing the retracted state of the joint tool, we provide a safe and compact device for engaging and disengaging the joint tool for friction stir welding even in the event of a power failure It is something to try.

  In order to achieve the above object, the friction stir welding joint tool engaging / disengaging device of the present invention is provided with a taper hole for fitting the joining tool holder to the output shaft of the stirring motor. One end of a retraction force generating portion using a disc spring in which a stepped portion is provided on the rear end side of the holder and the stepped portion and the detachable retracting claw are urged toward the rear of the output shaft. And a projecting portion projecting from a detaching actuator provided behind the stirring motor is opposed to the other end side of the pulling force generating portion, and the projecting portion causes the spring of the disc spring to be It is characterized by releasing power.

  The detaching actuator may be an air cylinder.

  The detaching actuator may be an electric motor.

  In the friction stir welding apparatus for engaging and disengaging the welding tool according to the present invention, a taper hole for fitting the holder of the welding tool is provided on the output shaft of the stirring motor, and the rear end side of the holder is provided. Since the stepped portion and the detachable retracting claw are connected to one end side of the pulling force generating portion using the disc spring biased toward the rear of the output shaft, The tool is securely and firmly held in the state of being pulled into the friction stir welding device by the spring force of the disc spring, and has a protruding portion protruding from the release actuator provided behind the stirring motor. Since the spring force of the disc spring is released by the protruding portion so as to face the other end side of the generating portion of the drawing force, the joining tool can be easily detached from the friction stir welding device, Safe and compact to maintain the holding state of the bonding tool even in the event of a power failure Do friction stir welding joint tool - a le of detachment device.

  Further, when the release actuator is an air cylinder, the protruding portion protruding from the release actuator operates instantaneously, and the friction stir welding that enables the removal of the joining tool reliably and at high speed. It becomes an engagement / disengagement device for a joint tool.

  When the release actuator is an electric motor, it is easy to adjust the stroke of the protruding part protruding from the release actuator, and the joining tool can be reliably removed. This is an engagement / disengagement device for a welding tool for friction stir welding.

  FIG. 1 is a schematic cross-sectional view of a friction stir welding apparatus suitable for carrying out the present invention. This joining apparatus softens and stirs an object to be joined (not shown) by frictional heat generated by rotation of a pin 1. In a friction stir welding apparatus comprising a stirring motor 3 for rotating a joining tool 2 having a pin 1 and a pressurizing motor 4 for driving the joining tool 2 straightly. Further, a taper hole 7 for fitting the holder 6 of the joining tool 2 to the output shaft 5 of the stirring motor 3 is provided, a stepped portion 8 is provided on the rear end side of the holder 6, and the step A retraction claw 9 detachably engageable with the attaching portion 8 is connected to one end side of a retraction force generating portion 11 using a disc spring 10 biased toward the rear of the output shaft 5, and the stirring motor 3 The protruding portion 13 that protrudes from the detaching actuator 12 provided behind is opposed to the other end side of the generating portion 11. So, the protruding portion 13 by bonding a friction stir welding was to open the spring force of the disk spring 10 tool - le of detachment device, it is.

  In the friction stir welding apparatus, a pin 1 is inserted at a joint point of workpieces (not shown) to be joined, and a part of the workpiece is softened and agitated by frictional heat generated by the rotation of the pin 1 to perform spot welding. The joining apparatus generally has the following configuration.

  A pressure motor 4 is fixed to a drive unit main body 14 attached to a wrist (not shown) of the robot, and a screw shaft 16 is fixed to an output shaft 15 of the pressure motor 4. Yes. 17 has a nut 18 that is screwed to the screw of the screw shaft 16 at one end thereof, and a pressure member that is fixed to the rear wall 19 of the release air cylinder that is the release actuator 12 at the other end. It is.

  The separation air cylinder 12 and the agitation motor 3 are connected by a front flange 20 of the separation air cylinder 12, and the separation air cylinder 12 is integrated on the same axis behind the agitation motor 3. Has been.

  A taper hole 7 is formed at the tip of the output shaft 5 of the stirring motor 3, and the holder 6 of the joining tool 2 is fitted in the taper hole 7. Yes.

  The joining tool 2 has a pin 1 formed on its central axis on the tip side, a collet 22 is disposed between the cylindrical part 21 formed on the rear side and the holder 6, and a nut 23 is tightened. Thus, the joining tool 2 and the holder 6 are integrally coupled.

  The holder 6 is formed with a screw 24 to be screwed with the nut 23 at the front end, and the rear portion from the intermediate stopper 25 is formed in a conical shape so as to fit into the taper hole 7 of the output shaft 5. A stepped pin constituting the stepped portion 8 is screwed to the side.

  The disc spring 10 is stretched between both flanges 26 and 27 that are built in the rear portion of the output shaft 5 and formed in the pull-in force generating portion 11 using the disc spring 10. A retracting claw 9 is pivotally supported at the front portion of the flange 26 of the generating portion 11 so as to lock the stepped portion 8 of the holder 6 and retract the holder 6.

  The detaching air cylinder 12 has a protruding portion 13 protruding from the pistons 28 and 28 in the cylinder toward the generating portion 11 side of the pulling force. Then, the air cylinder 12 is operated so that the tip of the protruding portion 13 comes into contact with the flange 27 side of the pulling force generating portion 11 and presses the generating portion 11, so that the generating portion 11 has the stepped portion 8 of the holder 6. The force which moves to the side, opens to the retraction claw 9 and retracts the holder 6 is released.

  In the friction stir welding apparatus having the above-described configuration, first, the entire friction stir welding apparatus is moved to a position facing a desired joining point of the objects to be joined by a robot or the like. Therefore, the pressurizing motor 4 is driven, and the pressurizing motor 4 causes the release air cylinder 12 and the agitating motor 3 to simultaneously advance toward the joining point of the objects to be joined. Friction stir welding of objects is performed.

  When the friction stir welding of the workpieces is completed, the rotation of the pressurizing motor 4 is reversed, and the separation air cylinder 12 and the stirring motor 3 are simultaneously moved to the pressurizing motor 4 side. The state before the joining work is restored.

  During use of the friction stir welding apparatus, the joining tool 2 has the joining tool holder 6 fitted to the output shaft 5 of the stirring motor 3, and the stepped portion 8 of the holder 6 is Since it is in the state of being pulled by the retraction claw 9, the joining tool 2 is securely and firmly held in the state of being drawn into the friction stir welding device by the spring force of the disc spring 10.

  Further, when the joining tool 2 is replaced, the friction stir welding apparatus is appropriately placed in a stationary state, and as described above, the separation air cylinder 12 is driven and the protruding portion 13 from the piston 28 is drawn in. 11, and the tip of the protruding portion 13 abuts against the flange 27 side of the pulling force generating portion 11 to press the generating portion 11, so that the generating portion 11 is on the stepped portion 8 side of the holder 6. Since the pulling claw 9 is released and the force to pull the holder 6 is released, the releasing operation is performed instantaneously, and the joining for friction stir welding that enables the joining tool to be removed reliably and at high speed is performed. It becomes a tool engagement / disengagement device.

  If the welding tool 2 is removed, a new welding tool 2 is assembled to the friction stir welding device. In this case, a new welding tool is inserted into the taper hole 7 of the output shaft 5 of the stirring motor 3. When the holder 6 of the barrel 2 is pushed in and the holder 6 is fitted to the output shaft 5, the stepped portion 8 of the holder 6 is accommodated in the open retraction claw 9, and at this point, the release air cylinder 12 is driven. By moving the protruding portion 13 from the piston 28 toward the side opposite to the pulling force generating portion 11 side, the pulling force acts on the pulling force generating portion 11 by the spring force of the disc spring 10, and the pulling claw 9 pulls the holder 6 while gripping the stepped portion 8 of the holder 6, and the joining tool 2 is securely and firmly assembled to the friction stir welding apparatus.

  In the joining apparatus as in the first embodiment, as shown in FIG. 2, an electric motor for detachment is used as the actuator 12 for detachment.

  In this case, a nut 32 is fixed to the output shaft 31 of the electric motor 12 for detachment, and the protruding portion 13 provided with a detent mechanism 34 having a screw 33 screwed to the nut 32 is the first embodiment. Similarly, it is disposed opposite to the other end of the pulling force generator 11, and the rest of the configuration is substantially the same as that described in the first embodiment. Description is omitted.

  In the case of this embodiment, the rotation of the motor is transmitted to the nut 32 via the output shaft 31 by driving the electric motor 12 for detachment, and the protrusion 13 generates a pulling force by the rotation of the nut 32. The unit 11 advances and retreats.

  As described above, when an electric motor for detachment is used as the actuator 12 for detachment, the stroke of the protruding portion 13 protruding from the actuator 12 for detachment can be easily adjusted and surely joined. -This is an engagement / disengagement device for a friction stir welding tool that can be detached.

FIG. 1 is a schematic configuration diagram of a friction stir welding apparatus to which a joining tool engaging / disengaging device according to the present invention is applied. FIG. 2 is a schematic view of the essential part of another embodiment of the friction stir welding apparatus to which the joining tool engaging / disengaging device according to the present invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pin 2 Joining tool 3 Stirring motor 4 Pressurizing motor 5 Stirring motor output shaft 6 Joining tool holder 7 Taper hole 8 Stepped part 9 Retraction claw 10 Disc spring 11 Pull-in force generating part 12 Detachment actuator 13 Protruding part

Claims (3)

  A device that softens and agitates the workpieces by frictional heat caused by the rotation of the pin, and agitating motor that rotates the joining tool having the pin and a pressurizing motor that drives the joining tool straightly. -In a friction stir welding apparatus equipped with a taper, a taper hole for fitting the holder of the welding tool is provided on the output shaft of the stirring motor, and a stepped portion is provided on the rear end side of the holder In addition, the stepped portion and the detachable retracting claw are connected to one end side of the retracting force generating portion using a disc spring biased toward the rear of the output shaft, and the rear of the stirring motor Friction characterized in that a protruding portion protruding from a detaching actuator provided on the opposite side is opposed to the other end side of the pulling force generating portion, and the spring force of the disc spring is released by the protruding portion. Engagement / disengagement device for stir welding tool.   2. The engagement / disengagement device for a friction stir welding tool according to claim 1, wherein said detaching actuator comprises an air cylinder. 2. The engagement / disengagement device for a friction stir welding tool according to claim 1, wherein said detaching actuator comprises an electric motor.

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