JP3435345B2 - Friction welding device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction welding device capable of friction welding a pair of works.

[0002]

2. Description of the Related Art Conventionally, a frictional pressure welding device for performing phase adjustment using a hydraulic cam system has been disclosed in Japanese Patent Laid-Open No. 3-184680. In this friction welding device, as shown in FIG. 3, a spindle 91 is rotatably supported in a base 90, and a chuck 92 for gripping one work WA is attached to the front end of the spindle 91. Further, the clamp slide 9 is attached to the base 90 so as to be movable in the axial direction in front of the chuck 92.
4 is provided, the clamp slide 94 is provided with a clamp 93 that holds the other work WB so as to face the work WA, and the friction thrust and the upset are set at the joining interface between the work WA and the work WB. A hydraulic thrust cylinder 97 capable of applying thrust is provided in the base 90. A pulley 98 is fixed to the rear end side of the main shaft 91, and a main shaft motor 96 composed of a general motor is provided outside the base 90. A pulley 96b is rotatably provided on the drive shaft of the main shaft motor 96 via a clutch 96a, and the belt 9 is provided between the pulleys 98 and 96b.
5 is installed. A cam surface is integrally formed at the rear end of the main shaft 91, and the main shaft 9 is formed in the base 90.
A moving cam 99 having a cam surface engageable with one cam surface is provided so as to be movable in the axial direction along the cam shaft 99a. A hydraulic release cylinder 102 is provided outside the base 90, and a clutch lever 101 is provided between the release cylinder 102 and the moving cam 99 so as to be swingable around a pivot shaft 100. Also, the base 9
Between 0 and the moving cam 99, a phase adjusting mechanism 103 that can slightly rotate the main shaft 91 is provided.

With this friction welding device, a pair of works W
When friction-welding A and WB, first, the spindle motor 96 is activated with the clutch 96a engaged. As a result, the main shaft 91 rotates via the pulley 96b, the belt 95, and the pulley 98, so that the work WA rotates with a positive torque. In this state, the thrust cylinder 97 is operated to bring the work WB closer to the main shaft 91 side, and the friction thrust is applied to the work WA and the work WB. In this way, the joint interface between the rotating work WA and the work WB is softened by heat generation.

If sufficient heat is generated for the pressure contact at the joint interface, the clutch 96a is disengaged from the main shaft 91.
Stop rotating. At this time, the instantaneous stop of the main shaft 91 is extremely important for securing the bonding strength due to temperature, softening, and the like. Further, when a design condition for joining the pair of works WA and WB at a specific phase in the rotation direction is imposed, the spindle 91 must be stopped at the specific phase. Therefore, at this time, the release cylinder 1
02 is operated to swing the clutch lever 101 to engage the cam surface of the moving cam 99 with the cam surface of the main shaft 91.
As a result, the rotation of the main shaft 91 is stopped via the pulley 96b, the belt 95, and the pulley 98.
A stops rotating due to the negative torque. Even if the rotation of the work WA is stopped in this way, the work WA, W
When the specific phase of B is shifted, the phase adjusting mechanism 1
03 is activated. And at the same time, thrust cylinder 9
At 7, an upset thrust larger than the friction thrust is applied.

Thus, the work WA and the work WB are frictionally welded to each other at the joint interface.

[0006]

However, as described above, in the friction pressure welding device for performing the phase alignment by the hydraulic cam type, the relative engagement of the work is mechanically performed by the engagement between the cam surface of the main shaft and the cam surface of the moving cam. Since the rotation is suddenly stopped, a large shock or noise is generated when the rotation is stopped, and durability tends to be poor.

In this respect, as described in Japanese Patent Laid-Open No. 9-174260, it may be possible to employ a servo motor as a means for generating and stopping relative rotation. In this way, the servo motor can apply positive torque to the spindle to cause relative rotation between the workpieces, while the servo motor can apply negative torque to the spindle to electrically rotate the workpieces. Since the relative rotation between the works can be stopped, no great impact or noise is generated at the time of stop, and excellent durability can be exhibited.

However, when the relative rotation is generated and stopped by the servomotor in this manner, the friction welding device causes relative rotation between the works via the chuck and the spindle, and both works are relatively large. Often, the servomotor must be capable of outputting a relatively large positive torque. In this case, the servo motor inevitably increases the size of the inertial body such as the rotor including the drive shaft, and the moment of inertia when negative torque for stopping the relative rotation is also increased. Therefore, in the friction welding device that employs the servomotor, the time required to stop the spindle is inevitably long, and there is a concern that the work after friction welding may have a problem in terms of joining strength and a specific phase.

The present invention has been made in view of the above-mentioned conventional circumstances, and it is possible to prevent impact and noise at the time of stopping and to exhibit excellent durability, and to provide a joint strength and a specific strength to a work after friction welding. It is an object to be solved to provide a friction welding device that is less likely to cause problems in terms of phase.

[0010]

Friction welding apparatus of the present invention According to an aspect of the word to the one workpiece and the other workpiece to be opposed to each other
The relative rotation and frictional thrust are applied by the crank rotation driving means to generate heat at the mutual bonding interface until the state becomes sufficient for pressure contact, then the relative rotation is stopped, and the one work and the other work In a friction welding device for applying an upset thrust force to the one workpiece and the other workpiece by friction welding at the joining interface, the workpiece rotation driving means is moved in the positive direction.
Torque and torque in the negative direction are jointly used to work on the one side.
And a plurality of servo motors to be applied to the servo motor , and the inertia body of the servo motors is made small so that the servo motors can be smoothly stopped in a specific phase in a short time.

In the friction welding device of the present invention, since the employed servo motor has a small inertial body such as a rotor including its rotary shaft, the moment of inertia when the relative rotation of a pair of works is stopped becomes small. . As a result, the moment of inertia when the negative torque for stopping the relative rotation is generated is also reduced. Therefore, in the friction welding device of the present invention, the time required to stop the spindle becomes relatively short,
It is less likely that defects will occur in the work after friction welding in terms of joining strength and specific phase.

In the friction welding device of the present invention, a plurality of servomotors are employed as the work rotation driving means . According to this configuration, since the plurality of servo motors generate relative rotations, the plurality of servo motors as a whole can output a relatively large positive torque, and can individually output a relatively small positive torque. That's enough. Therefore, in each servo motor, the inertial body such as the rotor including the drive shaft is inevitably downsized, and the moment of inertia when the negative torque for stopping the relative rotation is expressed becomes small, so that the time required to stop the main shaft is reduced. Since the length is shortened, it is possible to prevent defects in the joining strength of the work after friction welding and in terms of a specific phase.

Of course, since a plurality of servomotors electrically stop the relative rotation between the works, no great impact or noise is generated at the time of stop, and excellent durability can be exhibited. Therefore, in the friction welding device of the present invention, impact and noise at the time of stopping can be prevented and excellent durability can be exhibited, and defects in the joining strength and the specific phase are less likely to occur in the work after friction welding.

In order to reduce the inertial body of the servomotor, the rotating shaft is shortened, a lightweight material is selected for the rotor, and the rotor and the like are lightened in shape. The servomotors may be provided so as to drive the spindles in parallel, or the individual servomotors may be provided in series so as to drive the spindles. Further, it is preferable that the servomotors have the same characteristics such as output. This makes it easy to adjust the timing and the like when applying the torque in the positive direction and the torque in the negative direction.

A servo motor may be used as a means for applying the friction thrust and the upset thrust to the pair of works.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments 1 and 2 embodying the present invention will be described below with reference to the drawings. (Embodiment 1) In this friction welding device, as shown in FIG. 1, a main shaft 3 is rotatably supported in a base 1 via bearing devices 2a and 2b, and one workpiece is attached to a front end of the main shaft 3. A chuck 4 for holding the WA is attached. A clamp slide 6 is provided on the base 1 in front of the chuck 4 so as to be movable in the axial direction. In addition, a hydraulic thrust cylinder 8 capable of applying frictional thrust and upset thrust to the joint interface between the work WA and the work WB is provided in the base 1. A driven gear 13 is fixed to the rear end side of the main shaft 3 via a key 16, and a pair of twin main shaft motors 9 and 10 in which two servo motors are arranged in series are provided outside the base 1. ing. The dual spindle motors 9 and 10 have the same characteristics such as output.
Drive gears 11 and 12 are fixed to the drive shafts 9a and 10a of the main shaft motors 9 and 10 via keys 14 and 15, respectively, and these drive gears 11 and 12 are meshed with a driven gear 13.

With this friction welding device, a pair of works W
When friction-welding A and WB, first, both spindle motors 9, 1
Activate 0. As a result, the spindle 3 rotates via the drive gears 11 and 12 and the driven gear 13, so that the work WA rotates with a positive torque. In this state, the thrust cylinder 8 is actuated to bring the work WB closer to the spindle 3 side, and the friction thrust is applied to the work WA and the work WB.
In this way, the rotating work WA and the stationary work W
The joint interface with B softens due to heat generation. At this time, since a pair of twin spindle motors 9 and 10 generate relative rotation, the twin spindle motors 9 and 10 each output a relatively large positive torque as a whole, and The servo motor outputs only a relatively small positive torque, and the motor including the drive shafts 9a and 10a is smaller than when a single servo motor is used.

When sufficient heat is generated for the pressure contact at the mutual joint interface, a negative torque is applied by the double twin spindle motors 9 and 10 to stop the rotation of the spindle 3. At this time, each of the dual spindle motors 9 and 10 individually outputs a relatively small positive torque, so that the moment of inertia is smaller than when a large servomotor is used. Has become. Therefore, in this friction welding device,
The time required to stop the spindle 3 is shorter than when a large servomotor is used. At the same time, the thrust cylinder 8 applies an upset thrust larger than the friction thrust.

Thus, in this friction welding device, the main shaft 3
The workpiece WA and the workpiece WB are frictionally welded to each other at the joining interface without causing a problem in terms of joining strength or a specific phase because the upsetting thrust is applied almost instantaneously. Of course, in this friction welding device, since the relative rotation between the works WA and WB is electrically stopped by the dual spindle motors 9 and 10, no great impact or noise is generated at the time of stop, and excellent durability is achieved. You can exercise your sex.

Therefore, in this friction welding device, shock and noise at the time of stopping can be prevented and excellent durability can be exhibited, and at the same time, the work after friction welding is not likely to be defective in terms of joining strength and specific phase. (Embodiment 2) In this friction welding device, a pair of works W
A servo motor is also used as a means for applying frictional thrust and upset thrust to A and WB. That is, as shown in FIG. 3, the ball screw 2 is attached to the clamp slide 6.
1 is fixed, and the ball screw 21 is meshed with a ball nut 23 which is provided between the ball screw 21 and the base 1 via bearing devices 24a and 24b. A feed motor 22 composed of a servo motor is provided outside the base 1, and a drive gear 26 that meshes with a ball nut 25 is fixed to a drive shaft 22a of the feed motor 22. Since other configurations are the same as those of the first embodiment, the same configurations are denoted by the same reference numerals and detailed description thereof will be omitted.

With this friction welding device, a pair of works W
When friction-welding A and WB, as in the first embodiment, the dual twin spindle motors 9 and 10 are activated. Further, the feed motor 22 is activated to bring the work WB closer to the main shaft 3 side by the drive gear 26, the ball nut 23, and the ball screw 21, and a friction thrust is applied to the work WA and the work WB. In this way, the joint interface between the rotating work WA and the work WB is softened by heat generation.

If sufficient heat is generated for the pressure contact at the joint interface with each other, negative torque is applied by the double spindle motors 9 and 10 to stop the rotation of the spindle 3 as in the first embodiment. . Then, at the same time, the feed motor 22 is activated again, and the drive gear 26, the ball nut 23, and the ball screw 21 apply an upset thrust larger than the friction thrust. In this way, this friction welding device can also achieve the same effect as that of the first embodiment.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a friction welding device according to a first embodiment.

FIG. 2 is a schematic sectional view of a friction welding device according to a second embodiment.

FIG. 3 is a schematic cross-sectional view of a conventional friction welding device.

[Explanation of symbols]

WA, WB ... work 1 ... Base 3 ... Spindle 4 ... Chuck 6 ... Clamp slide 7 ... Clamp 8 ... Thrust cylinder 9, 10 ... Dual spindle motor (servo motor) 11, 12 ... Drive gear 13. Driven gear 21 ... Ball screw 22 ... Feed motor (servo motor)

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshitaka Tsukamoto 1-3 Shimizu, Kitazaki-cho, Obu-shi, Aichi Izumi Industry Co., Ltd. (56) Reference JP-A-61-283479 (JP, A) JP-A-9- 285879 (JP, A) JP 61-283478 (JP, A) JP 10-58164 (JP, A) JP 10-118777 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23K 20/12

Claims (2)

(57) [Claims] 1. A workpiece rotating drive means applies relative rotation and frictional thrust to one of the workpieces and the other workpiece facing each other to generate heat at a joining interface between the workpieces until the workpiece is in a state sufficient for pressure welding. In a friction welding device that stops relative rotation and applies upset thrust to the one work and the other work to frictionally weld the one work and the other work at the joining interface, the work rotation The drive means should be positive torque and negative torque.
Friction characterized in that a plurality of servomotors that jointly apply torque to one of the workpieces are used , and the inertial body of the servomotors is made small so as to smoothly and quickly stop at a specific phase. Pressure welding device. 2. The friction welding device according to claim 1, wherein the plurality of servomotors have the same characteristics.