JP4707484B2 - Friction stir welding equipment - Google Patents

Description

  The present invention is an apparatus for softening and agitating and joining an object to be joined by frictional heat generated by the rotation of a pin, the agitating motor and the pin at the tip, and the rear end of the agitating motor. The present invention relates to a friction stir welding apparatus in which a joining tool connected to an output shaft side is disposed on the same axis, and the joining tool is inclined with respect to an object to be joined.

  2. Description of the Related Art Conventionally, an apparatus for softening and agitating an object to be joined by frictional heat generated by rotation of a pin, the agitation motor having the pin at the front end and the rear end being the output shaft of the agitation motor There is a friction stir welding apparatus in which a joining tool connected to a side is arranged on the same axis, and the joining tool is inclined with respect to an object to be joined (see, for example, Patent Document 1).

Japanese Patent No. 3261431

  By the way, in the above prior art, the ball screw axis that generates the pressing force, the linear motion guide, and the agitating motor axis are greatly decentered. Since intermittent torque corresponding to the rotation frequency is applied and vibration is generated and the life of the linear guide of the pressing device is shortened, it is necessary to increase the size of the linear guide part, resulting in an increase in cost. In addition, there is a high possibility that the guide portion of the pressing device interferes with a narrow part surrounded by an object to be joined or a jig, which becomes an obstacle and makes it difficult to move the joining device to a narrow part. Furthermore, since the center of pressing force and the center of rotation of the stirring shaft of the agitating motor are greatly decentered, overturning torque is applied to the center of pressing force when the agitating motor is pressed against the workpiece. There is a problem that it is generated and an excessive burden is applied to the guide.

The present invention has been made in view of such problems of the prior art, it is an object volume to generate a pressing force - stirring the ball screw axis mode - almost a match the motor axis Thus, the friction stir welding apparatus is intended to reduce the size of the apparatus by eliminating the generation of the overturning torque due to the pressing force and to facilitate the joining operation.

In order to achieve the above object, a friction stir welding apparatus according to the present invention is an apparatus that softens and stirs an object to be joined by frictional heat generated by rotation of a pin, and joins the pin to the stir motor and the tip. And a stirring tool having a rear end connected to the output shaft side of the agitating motor on the same axis, and the joining tool inclined with respect to the workpiece In the apparatus, the linear motion guide is fixed to the rear part of the agitation motor as a means for causing the agitation motor to guide the linear motion guide by the pressing motor and move forward and backward. A ball nut is fixed to the rear end side, and a hole for storing a ball screw is formed in the output shaft of the stirring motor from the rear, and the ball screw is disposed in the hole. The rotational force of the pressing motor fixed to the housing for housing the motor is transmitted to the ball screw, - ball screw screwed to ball - the data so as to forward and backward, the housing guide rail in the body - - the agitating motor by ball nut disposed Le, the guide rail - the said linear guide to move along the Le It is fixed at the rear of the agitating motor at an angle inclined in the axial direction of the agitating motor, and the joining tool is moved forward and backward at an angle with respect to the guide direction of the linear guide. It is a thing.

  Further, a trunnion shaft is used as a means for fixing the pressing motor to the casing and a means for fixing the ball nut to the agitating motor.

  The position detector of the agitating motor is arranged on the front end side of the agitating motor.

  Further, the electromagnetic brake of the stirring motor is arranged on the front end side of the stirring motor.

  Further, the wiring connecting portion of the stirring motor is arranged on the front end side of the stirring motor.

In the friction stir welding apparatus according to the present invention , the linear motion guide is fixed to the rear portion of the agitation motor as means for causing the agitation motor to be guided by the linear motion guide by the pressing motor and moving forward and backward. A ball nut is fixed to the rear end side of the agitating motor, and a hole is formed in the output shaft of the agitating motor to accommodate a ball screw from the rear to form a ball in the hole. A ball nut that disposes a screw, transmits the rotational force of the pressing motor fixed to the casing that houses the stirring motor to the ball screw, and is screwed with the ball screw. The agitating motor is moved forward and backward by the guide rail, the guide rail is disposed in the casing, and the linear guide that moves along the guide rail is agitated at the rear of the agitating motor. Fix the joint tool at an angle inclined in the axial direction of the motor. Since it is moved forward and backward at an angle, the center of pressure of the pressing force by the ball screw in the housing and the center of rotation of the stirring shaft of the stirring motor are substantially coincident or slightly eccentric. -When the actuator is pressed against the object to be joined, a tipping torque is not generated at the center of the pressing force, and the guide is not overburdened. The friction stir welding apparatus is safe and easy to use without interfering with the jig.

  When a trunnion shaft is used as a means for fixing the pressing motor to the casing and a means for fixing the ball nut to the stirring motor, the fixing of the pressing motor and the ball nut is performed. Will be more certain.

  Further, in the inventions according to claims 3 to 5, each component attached to the agitation motor is disposed on the front end side of the agitation motor. -A friction stir welding apparatus in which the rear end side of the motor has a margin and the rear part of the stirring motor can be effectively used can be provided.

As a means to guide the agitating motor with the linear motion guide by the pressing motor and move forward and backward, the linear motion guide is fixed to the rear of the agitating motor and the rear end side of the agitating motor A ball nut is fixed to the output shaft of the agitation motor, and a hole for accommodating the ball screw is formed from the rear on the output shaft of the agitation motor, and the ball screw is disposed in the hole. The rotational force of the pressing motor fixed to the housing for housing the motor is transmitted to the ball screw, and the stirring motor is moved forward and backward by a ball nut screwed to the ball screw. The guide rail is arranged in the housing, and the linear guide that moves along the guide rail is inclined at the rear of the stirring motor in the axial direction of the stirring motor. The joint tool is moved forward and backward at an angle with respect to the guide direction of the linear guide. By, it realized a safe and easy-to-use friction stir welding apparatus.

  FIG. 1 is a schematic configuration explanatory diagram of a friction stir welding apparatus according to the present invention, FIG. 2 is a schematic configuration explanatory diagram of its plane, and FIGS. 3, 4 and 5 are explanatory diagrams of an example of its use.

  1 to 5, reference numeral 1 denotes a gun bracket connected to the wrist 2 of the robot. A housing 3 is provided at the base of the gun bracket 1, and a pressing mode is provided on one side of the housing 3. 4 is arranged (see FIGS. 3 and 4).

  A stirring motor 5 is disposed in the casing 3, and a joining tool 8 having a pin 7 at the tip is placed on the same axis at the tip of the output shaft 6 of the stirring motor 5. It is connected.

  A ball nut 9 is fixed to the rear end side of the agitating motor 5, and a linear motion guide 11 is attached to one side of the bracket 10 that holds the ball nut 9 of the agitating motor 5. Inclined at an angle of α with respect to the axis. Further, a guide rail 12 is provided in the housing 3 so as to be very close to the stirring motor 5 and inclined at an angle α with respect to the axial direction of the stirring motor 5. The linear motion guide 11 is movable along the guide rail 12, and the bracket 10 of the linear motion guide 11 is fixed to the rear side of the agitating motor 5.

  A ball screw shaft 14 is fixed to the rotary shaft 13 of the pressing motor 4 with a nut 15, and a ball screw 16 is formed on the tip side of the ball screw shaft 14. The ball screw 16 is guided from the pressing motor 4 into the housing 3 and extends from the rear to the hole 17 formed with a margin in the output shaft 6 of the stirring motor 5. In the middle of this, it is screwed with a ball nut 9 fixed to the rear end side of the agitating motor 5.

  The joining tool 8 is sandwiched and connected by a chuck 18 to the tip side of the output shaft 6 of the stirring motor 5.

  Reference numeral 19 denotes a bearing for the output shaft 6 of the stirring motor 5, and 20 denotes a bearing for the rotary shaft 13 of the pressing motor 4.

  This friction stir welding apparatus connects the workpieces W1 and W2 placed on the table 21 in succession by a robot to the workpieces W1 and W2 that are stationary as shown in FIG. In order to move the joining device continuously or to spot-join the workpieces W1 and W2, the robot moves the joining device to position the joining portion on the tip side of the arm 22 as shown in FIG. Alternatively, as shown in FIG. 5, it is possible to place spot joints of the workpieces W1 and W2 on a stationary cradle 23 and perform spot joining with a stationary joining apparatus.

  In the friction stir welding apparatus configured as described above, the pressing motor 4 and the stirring motor 5 are driven in a state where the joining apparatus is positioned above the workpieces W1 and W2.

  The ball screw shaft 14 is rotated by the driving of the pressing motor 4, and when the ball screw 16 is rotated by the rotation of the ball screw shaft 14, the ball screw 16 is screwed together. The ball nut 9 is going to move forward and backward. The ball nut 9 is moved back and forth by the linear motion guide 11 of the stirring motor 5 to which the ball nut 9 is fixed. The linear motion guide 11 is set at an angle α with the axis of the stirring motor 5. Since it is provided with an inclination, the agitating motor 5 moves in and out of the housing 3 while being inclined as a pressure rod while being accompanied by a joining tool 8 having a pin 7 at the tip.

  Since the agitating motor 5 driven together with the pressing motor 4 is connected to the distal end side of the output shaft 6 as described above, the joining tool 8 having the pin 7 at the distal end is connected. The welding tool 8 rotates on the same axis as the stirring motor 5 and performs friction and stirring operations on the workpieces W1 and W2 by the pins 7.

  During this friction and stirring operation, the welding tool 8 is inclined at an angle α with respect to the workpieces W1 and W2, and the shoulder portion of the welding tool 8 is stirred by the pin 7. The joint surfaces of the workpieces W1 and W2 being pressed are sequentially pressed to realize reliable joining by the friction stir welding apparatus.

As described above, in the friction stir welding apparatus according to the present invention , the linear motion guide 11 is used as the means for moving the agitation motor forward and backward by guiding the agitation motor with the linear motion guide by the pressing motor. The ball nut 9 is fixed to the rear portion and the ball nut 9 is fixed to the rear end side of the stirring motor 5, and the ball screw 16 is stored in the output shaft 6 of the stirring motor 5 from the rear. A hole 17 is formed, and a ball screw 16 is disposed in the hole 17, and the rotational force of the pressing motor 4 fixed to the housing 3 that accommodates the stirring motor 5 is applied to the ball. The stirring motor 5 is moved forward and backward by a ball nut 9 that is transmitted to the screw 16 and screwed with the ball screw 16, and a guide rail 12 is disposed in the housing 3, The linear motion guide 11, which moves along the guide rail 12, is placed at the rear of the stirring motor 5. Since the joint tool 8 is moved forward and backward at an angle α with respect to the guide direction of the linear guide 11, the ball screw 16 in the housing 3 is fixed at an angle α inclined in the axial direction. Since the center of pressing of the pressing force by the shaft and the center of rotation of the stirring shaft of the stirring motor 5 are substantially coincident or slightly decentered, the pressing is performed when the stirring motor 5 is pressed against the workpieces W1 and W2. The overturning torque is not generated in the center of the pressure and the guide is not overburdened, and the casing 3 prevents the pressing device from interfering with the object to be joined and the surrounding jig. .

  When trunnion shafts 31 and 32 are used as means for fixing the pressing motor 4 to the housing 3 and means for fixing the ball nut 9 to the agitating motor 5, as shown in FIG. The pressing motor 4 and the ball nut 9 can be fixed more easily and reliably.

  In FIG. 1, for example, a resolver which is a position detector 51 of the stirring motor 5 is arranged on the front end side of the stirring motor 5.

  When the position detector 51 is provided on the front end side of the agitating motor 5 in this way, there is room on the rear side of the agitating motor 5 so that the rear portion can be used effectively, and other members such as The arrangement of the ball screw 16 and the ball nut 9 is also facilitated.

  In FIG. 1, an electromagnetic brake 61 of the stirring motor 5 is disposed on the front end side of the stirring motor 5.

  Even when the electromagnetic brake 61 is provided on the front end side of the agitating motor 5 as described above, there is room on the rear side of the agitating motor 5 so that the rear portion can be used effectively, and other members can be used. For example, the ball screw 16 and the ball nut 9 can be easily arranged.

  In FIG. 1, a wiring connection portion 71 of the stirring motor 5 is disposed on the front end side of the stirring motor 5.

  Thus, even when the wiring connection portion 71 of the stirring motor 5 is provided on the front end side of the stirring motor 5, there is a margin on the rear side of the stirring motor 5, and the rear portion is effectively used. In addition, other members such as the ball screw 16 and the ball nut 9 can be easily arranged.

FIG. 1 is a schematic configuration explanatory view of a friction stir welding apparatus according to the present invention. FIG. 2 is an explanatory diagram of a schematic configuration of the plane. FIG. 3 is an explanatory view of an example of use of the friction stir welding apparatus according to the present invention. FIG. 4 is also an explanatory view of an example of use of the friction stir welding apparatus according to the present invention. FIG. 5 is also an explanatory diagram of a usage example of the friction stir welding apparatus according to the present invention.

3 Housing 4 Pressing Motor 5 Stirring Motor 6 Stirring Motor Output Shaft 7 Pin 8 Joining Tool 9 Ball Nut 11 Linear Guide 12 Guide Rail 16 Ball Screw 17 Hole 31, 32 Trunnion shaft 51 Position detector 61 Electromagnetic brake 71 Wiring connection

Claims (5)

A device for softening and agitating the workpieces by frictional heat generated by the rotation of the pins, with the agitating motor and the pin at the tip, and the rear end facing the output shaft side of the agitating motor In a friction stir welding machine in which the connected welding tools are arranged on the same axis and the welding tools are inclined with respect to the workpiece , the stirring motor is directly moved by the pressing motor. As a means to guide and move forward and backward with a guide, a linear motion guide is fixed to the rear part of the agitating motor, and a ball nut is fixed to the rear end side of the agitating motor, and the agitating motor is fixed. A hole for storing the ball screw is formed in the output shaft of the motor from the rear, and the ball screw is disposed in the hole, and the pressing motor is fixed to the housing for housing the stirring motor. The rotational force of the rotor is transmitted to the ball screw, and the stirring motor is moved forward and backward by a ball nut that is screwed with the ball screw. So as to, the housing guide rail in the body - Place Le, said guide rail - for the stirring said linear guide to move along the Le mode - mode stirrer to the rear of the motor - a slanted angle in the axial direction of the motor The friction stir welding apparatus is characterized in that the joining tool is moved forward and backward at an angle with respect to the guide direction of the linear guide. Other fastening means and the stirring motor - - board to data - friction stir welding apparatus according to claim 1, characterized by using the trunnion axis to a fixed means of ball nut the pressing motor to the housing.   2. The friction stir welding apparatus according to claim 1, wherein a position detector of the stirring motor is disposed on a front end side of the stirring motor.   2. The friction stir welding apparatus according to claim 1, wherein an electromagnetic brake of the stirring motor is disposed on a front end side of the stirring motor. 2. The friction stir welding apparatus according to claim 1, wherein a wiring connection portion of the stirring motor is disposed on a front end side of the stirring motor.

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