JP2005334891A - X-type friction stir spot joining gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-type friction stir spot joining gun that stably withstands long-term use by arranging a reducer in the main shaft, bearing a load on the main shaft bearing part with the bearing of a large load capacity on the reducer side, and thereby preventing generation of play in the main shaft. <P>SOLUTION: The X-type friction stir spot joining gun is a device for softening, stirring, and joining objects to be joined by the frictional heat generated by rotation of a pin 4, wherein a joining tool 5 with the pin at the tip end is arranged on the one end side of an X-type arm. One of the X-type arms is constituted as an oscillation arm 3, and the other of the X-type arms as a stationary arm 2. In the main shaft 8 pivotally supporting both arms, a reducer 9 is arranged to reduce turning from a motor 19 for driving the arms, so that the load on the main shaft from the oscillation arm is born by the ball bearing or roller bearing inside the reducer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is an apparatus for softening and agitating an object to be joined by frictional heat generated by rotation of a pin, and arranging a joining tool having the pin at the tip on one end side of an X-type arm. X-type friction stir spot welding gun.

  2. Description of the Related Art Conventionally, an apparatus for softening and agitating an object to be joined by frictional heat generated by the rotation of a pin, in which an X-type arm is provided with a joining tool having the above-mentioned pin at one end thereof. One type of friction stir spot welding gun has a crotch main shaft configuration that changes the joining portion of both arms (see, for example, Patent Document 1).

JP 2002-153978 A FIG.

  By the way, for the X-type friction stir spot welding gun, the longer the arm length, the greater the distance between the stirring point at the arm tip and the main shaft, and the larger the moment load on the main shaft due to the rotational force during stirring. Become. As a result, the load on the bearing portion of the main shaft increases. And in the above-mentioned conventional technology, since the shaft is supported by the crotch main shaft configuration that changes the fixed arm and the swinging arm, the load is borne between the main shaft and its bearing, When the gun is in use, rattling occurs between the main shaft and the bearing at an early stage, and even if there is a small amount of rattling, the tip of the arm is amplified and enlarged. As a result, the pin rotates while the center fluctuates. May not be joined, and the life of the X-type friction stir spot welding gun may be shortened.

  The present invention has been made in view of such problems of the prior art, and an object of the present invention is to dispose a speed reducer on the main shaft portion and to apply a load on the bearing portion of the main shaft to the speed reducer. It is intended to provide an X-type friction stir spot welding gun that can be supported by a bearing having a large load capacity on the side to prevent the main shaft from rattling and can stably withstand long-term use.

  In order to achieve the above object, an X-type friction stir spot welding gun according to the present invention is an apparatus for softening and agitating a workpiece to be joined by frictional heat caused by rotation of a pin, In an X-type friction stir spot welding gun in which a joining tool having the pin at the tip is arranged on the end side, one of the X-type arms is configured as a swinging arm, and the X-type arm The other side of the arm is configured as a fixed arm, and a speed reducer that decelerates rotation from the arm driving motor is arranged on the main shaft portion that supports both arms, and a ball bearing in the speed reducer is arranged. Alternatively, the load applied to the main shaft from the swinging arm is borne by a roller bearing.

  Further, a stirring motor for rotating the pin is provided in the swing arm in the vicinity of the main shaft portion.

  Further, the stirring motor for rotating the pin is provided on the tip side of the swinging arm on the same axis as the joining tool.

  In the X-type friction stir spot welding gun according to the present invention, one of the X-type arms is configured as a rocking arm, and the other of the X-type arms is configured as a fixed arm. The speed reducer from the arm drive motor is placed on the main shaft that supports the arm, and the ball bearing or roller bearing in the speed reducer bears the load on the main shaft from the swinging arm. As a result, the moment load due to the rotational force during stirring is transmitted to the speed reducer via the swing arm, and is received by the ball bearing or roller bearing having a large load capacity in the speed reducer. The backlash of the main shaft does not occur until the bearing fatigue life is reached. Moreover, since the ball bearing or roller bearing is sealed inside the reduction gear, its calculated life can be reliably maintained.

  The X-type friction stir spot welding gun is configured as follows: “One of the X-type arms is configured as a rocking arm, the other of the X-type arms is configured as a fixed arm, and both arms are pivotally supported. A reduction gear from the motor for driving the arm is arranged on the main shaft, and the ball bearing or roller bearing in the reduction gear bears the load on the main shaft from the swinging arm. '' It is configured.

  FIG. 1 is a schematic side configuration diagram of an X-type friction stir spot welding gun according to the present invention, and FIG. 2 is a cross-sectional configuration diagram of a main shaft portion.

  1 and 2, reference numeral 1 denotes a gun bracket connected to a wrist (not shown) of a robot, and a rear end portion of a fixing arm 2 is fixed to a base portion of the gun bracket 1.

  Reference numeral 3 denotes a swing arm, and a joint tool 5 having a stirring pin 4 at the tip is rotatably held by a bearing 6 at a tip portion of the swing arm 3 and is directed downward at an intermediate portion. A protruding portion 7 is formed, and the rear end portion is connected to an output shaft 10 of a speed reducer 9 disposed on the main shaft portion 8.

  A backing material 11 is attached to the tip of the fixed arm 2, and an article to be joined (not shown) is provided on the backing material 11, and an upward projecting portion is provided in the middle portion. 12, the end of the projecting portion 12 is fixed to the base portion of the bracket 1 as described above, and the fixing arm 2 and the swinging arm 3 form an X-type arm.

  A stirring motor 13 is disposed in the vicinity of the main shaft portion 8 at a rear portion of the swinging arm 3 and the pulley 14 provided on the output side of the stirring motor 13 and the joining tool. An endless belt 16 is stretched between the pulley 15 provided on the belt 5.

  Reference numeral 17 denotes a main shaft disposed in the main shaft portion 8. The main shaft 17 is pivotally supported by a bearing 18 on the base side of one gun bracket 1, and a drive held by the gun bracket 1 is disposed on one end side of the main shaft 17. A pulley 21 that is rotated by an endless belt 20 by a driving force from a motor 19 is provided, and the rotation of the main shaft 17 swings the swing arm 3 via the speed reducer 9. It is configured to let you. A ball bearing 23, which is a rolling bearing having a large load capacity, is disposed between the speed reducer main body 22 and the output shaft 10 of the speed reducer in the speed reducer 9. In place of the ball bearing 23, a roller bearing may be used.

  In the X-type friction stir spot welding gun configured as described above, the robot is brought close to the workpiece by the robot, and the backing material 11 at the tip of the fixed arm 2 is in contact with the workpiece. Then, the driving motor 19 and the agitating motor 13 are driven.

  By driving the driving motor 19, the rotational force of the motor 19 rotates the main shaft 17 via the endless belt 20 and pulley 21, and the rotation is a gear provided on the main shaft 17. 24 is decelerated in the speed reducer main body 22 through the speed reduction mechanism 25 in the speed reducer 9 and transmitted to the output shaft 10 of the speed reducer, and the swing arm 3 swings by the output shaft 10. In other words, the oscillating arm 3 performs an oscillating motion through the speed reducer 9 in the main shaft portion 8 by driving the driving motor 19, and the oscillating arm 3 oscillates. The joining tool 5 attached to the distal end side of the moving arm 3 approaches or separates from the object to be joined. Therefore, the driving motor 19 has a role of causing the pin 4 to be pressed against the object to be joined.

  As described above, the stirring motor 13 driven together with the driving motor 19 is between the pulley 14 provided on the output side and the pulley 15 provided on the joining tool 5. Since the endless belt 16 is stretched, the joining tool 5 is rotated by driving the stirring motor 13 and the pin 4 performs friction and stirring operations on the workpiece.

  As described above, in the X-type friction stir spot welding gun according to the present invention, the joining tool 5 having the pin 4 is connected to the tip side of the swinging arm 3 that generates the pressing force of the X-type arm. Therefore, the moment load due to the rotational force at the time of stirring is transmitted to the speed reducer 9 through the swinging arm and is transmitted to the main shaft 17. Since the large ball bearing 23 or the roller bearing is built in, the moment load may be received by the ball bearing 23 or the roller bearing in the speed reducer 9 before being transmitted to the main shaft 17. it can. Therefore, the backlash of the main shaft portion 8 does not occur until the fatigue life of the bearing 23 is reached. Moreover, since the ball bearing 23 or the roller bearing is sealed inside the speed reducer 9, the calculated life can be reliably maintained.

  FIG. 3 is a schematic configuration diagram of another embodiment of the X-type friction stir spot welding gun according to the present invention. In this embodiment, a stirring motor 13 is provided at the tip of the oscillating arm 3, The present embodiment is different from the first embodiment in that the joining tool 5 having the pin 4 at the tip is connected to the stirring motor 13 on the same axis, and the other configuration is substantially the same as the first embodiment. Therefore, the same members are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

  In this joining gun, the agitating motor 13 is directly connected to the joining tool 5, so that the necessary parts can be saved and the whole gun is made slim compared to the first embodiment. The effect expected in the invention is not substantially different from the first embodiment.

FIG. 1 is a schematic configuration diagram of an X-type friction stir spot welding gun according to the present invention. FIG. 2 is a cross-sectional configuration diagram of the main shaft portion. FIG. 3 is a schematic configuration diagram of another embodiment of the X-type friction stir spot welding gun according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gun bracket 2 Fixed arm 3 Oscillating arm 4 Pin 5 Joining tool 8 Main shaft part 9 Reducer 13 Motor for stirring 19 Motor for driving 23 Ball bearing

Claims (3)

  An apparatus for softening and agitating the workpieces by frictional heat generated by the rotation of the pin, and joining them by joining the welding tool having the pin at the tip to one end of the X-type arm. In a stirring spot welding gun, one of the X-type arms is configured as a rocking arm, the other of the X-type arms is configured as a fixed arm, and a spindle that pivotally supports both arms A speed reducer that decelerates the rotation from the motor for driving the arm is arranged in the part, and the load applied to the main shaft from the swinging arm is borne by the ball bearing or roller bearing in the speed reducer. An X-type friction stir spot welding gun characterized in that   2. The X-type friction stir spot welding gun according to claim 1, wherein a stirring motor for rotating the pin is provided in a swing arm in the vicinity of the main shaft portion. 2. An X-type friction stir spot welding gun according to claim 1, wherein a stirring motor for rotating the pin is provided on the tip side of the swinging arm on the same axis as the welding tool.

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