JPH0994680A - Friction welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize friction welding equipment. SOLUTION: A chuck 2 is provided at the tip end of a cylindrical main shaft 1 into which a work W1 is insertable, and axially supported on the main shaft body 20. On the outer wall of the chuck 2, a puley 24 and a disk plate 22 are arranged close to each other. The pulley 24 is driven by a motor 25 through a belt 27. The disk plate 22 is held by a pair of calipers 23, generating a braking force. The stopper 35 at the rear end of the work is arranged inside the main shaft 1. The stopper 35 is supported rotatably on a shaft 38, with its rear end abutted on the stopper shim 401 of an adjust bracket 40 that is freely attachable and detachable to the main shaft body 20. The stopper shim 401 is prepared in different thicknesses and can be easily exchanged. The stopper 35 is positioned by exchanging the stopper shim 401 with that of a desired thickness and displacing the shaft 38 in the axial direction of the main shaft 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a main shaft structure of a friction welding device in which a work is mounted and driven to rotate.

[0002]

2. Description of the Related Art A friction welding device welds both works by utilizing frictional heat generated by applying relative rotation and pressing pressure between a pair of works arranged coaxially. The friction welding device has a clamp for fixing one work and a main shaft for rotating the other work by fixing the work with a chuck. Either the main shaft or the clamp is horizontally moved in the axial direction of the main shaft to bring the two works into contact with each other, and a pressing pressure is generated on the contact surface.

FIG. 6 shows the main spindle structure in a conventional friction welding device. The spindle 1 has a cylindrical shape and has a work W at the tip.
_It has a chuck 2 for fixing ₁ . The main shaft 1 is attached to the housing 4 via a bearing 3. The housing 4 is an oil reservoir for supplying oil to the braking means 7 described later. Other necessary parts of the device (not shown) are also mounted on the upper surface of the housing 4. A pulley 5 is attached to the rear end of the main shaft 1,
Driving force of a motor or the like (not shown) by the belt 6 is the main shaft 1.
Is transmitted to Further, inside the housing 4, the main shaft 1
Braking means 7 and a cylinder 8 for opening and closing the chuck 2.
And The braking means 7 is a wet type (lubricating oil inside to obtain a braking force). The work W ₂ is arranged coaxially with the spindle 1 by a clamp (not shown).

Inside the spindle 1, there is arranged a front stopper 9 which is a means for holding the rear end of the work W ₁ . The front stopper 9 is movable in the axial direction with respect to the spindle 1, but
It is fixed in the direction of rotation and rotates with the main shaft 1. By contacting the rear end of the work W ₁ inserted through the main shaft 1 with the front stopper 9, the insertion limit position of the work W ₁ is determined, and the reaction force applied to the work W ₁ during friction welding is determined. The front stopper 9 is adapted to receive it. The rear end portion of the front stopper 9 is axially supported by the rear stopper 11 via a thrust bearing 10, and the front and rear stoppers 9 and 11 are integrally positioned in the axial direction of the main shaft by an axial positioning structure described later. It

The rear stopper 11 is supported by a bracket 12 and can normally move only in the axial direction (state shown), but it is not shown when it is displaced forward by a cylinder 13 attached to the bracket 12. The engagement between the key and the key groove is released, and the key can be rotated. Where
The axial positioning structure 14 of the rear stoppers 9 and 11 will be described with reference to FIGS. 6 and 7. By the way, this positioning structure adjusts the protrusion amount of the work W ₁ from the chuck 2 by changing the contact position between the front stopper 9 and the work W ₁ even when the work having different lengths is handled. This is for effectively suppressing the vibration generated in the joint portion between the two workpieces at the optimum position of the workpiece joining position with respect to the chuck 2 and for reliably performing the pressure welding work.

The rear stopper 11 has a pin 15 projecting diametrically. In addition, the rear stopper 11 has a position adjusting tube 16
Is rotatably provided and is arranged between the pin 15 and the bracket 12. The position adjusting cylinder 16 has a first
A concave portion 161 and a second concave portion 162 are formed, and one of them is engaged with the pin 15. A gear portion 163 is formed on the outer circumference of the position adjusting cylinder 16. This gear part 163 is a rod
It is engaged with the rack part 171 of 17. Then, the rod 17 is switched by the switching cylinder 18 to drive the position adjusting cylinder.
16 can be rotationally driven. All the above spindle structures,
It is installed on the base 19.

By the way, as shown in FIG. 7, the pin 15 is the first
From the state of being engaged with the recess 161 and being positioned, the second recess
To move to 162, do the following: First, the rear stopper 11 is pushed forward by the cylinder 13 (FIG. 6) to release the engagement between the first recess 161 and the pin 15, and then the rod 17 is moved in the arrow direction in FIG. 16
Is rotated to align the second recess 162 with the pin 15.
The rear stopper 11 is pulled backward by the cylinder 13 again to engage the pin 15 with the second recess 162. The second recess 162 is the first
Since it is formed deeper than the concave portion 161, the front and rear stoppers 9 and 11 are positioned further rearward. With the positioning structure 14 described above, even if the length of the work W ₁ is changed, it can be dealt with immediately. As the above-mentioned conventional example, the actual development 58
The details are disclosed in Japanese Patent Publication No. 96882.

[0008]

However, the friction welding device having the above structure has the following problems. First, the stopper for holding the rear end of the work W ₁ is divided into two parts, front and rear, to provide a positioning structure 14 in the axial direction, and since the positioning structure is also a type that operates mechanically, the entire device is upsized and installed. It was limited by space. Further, a cylinder 8 for opening and closing the chuck 2, which is a fixing means for the work W ₁ , and a braking means 7 for the spindle.
In the housing 4, the pulleys 5 which are means for transmitting power to the main shaft 1 are arranged behind the main shaft 1 and are independently fixed to the main shaft 1. It was necessary to remove the spindle 1 from the device also when performing the maintenance. Further, as for the braking means 7 and the cylinder 8, it is necessary to disassemble and assemble the housing 4, and therefore, disassembling and assembling work at the time of performing repairs, replacements, and the like are troublesome. Further, since the chuck 2, the braking means 7 and the pulley 5 which is the power transmission means are arranged separately from each other on the main shaft 1, a large torsion stress is applied to the main shaft 1 at the time of friction welding and braking. As a result, excessive force is applied to the device and durability is reduced.

The present invention has been made in view of the above problems, and an object thereof is to simplify the axial positioning structure of the holding means at the rear end of the work, and
By centrally disposing the power transmission means and the braking means to the main shaft at the tip of the main shaft and making them detachable, it is possible to improve the maintainability and downsize the entire apparatus.

[0010]

Means for Solving the Problems According to the present invention for solving the above problems, there is provided a friction welding device for applying relative rotation and pressing pressure between a pair of coaxially arranged works, It has a cylindrical main shaft that is rotatably supported by the main shaft main body and allows the work to be inserted therein, and a fixing means for the work is provided at the tip of the main shaft, and a power transmission means and a braking means for the main shaft are provided on the outer wall of the fixing means. Arranged close to each other, a holding means for holding the rear end of the work and a shaft for rotatably supporting the holding means are arranged inside the main spindle, and the positioning means for the shaft is detachably provided on the main spindle body. Is characterized by.

In the present invention, a work fixing means is provided at the tip of the main shaft, and a power transmission means and a braking means for the main shaft are provided on the outer wall of the fixing means so that both are exposed and the rotational driving force and the braking force are applied. It is directly transmitted to the fixing means.
Further, by disposing the power transmission means and the braking means in close proximity, the braking force is directly transmitted to the driving means. further,
The power transmission means and the braking means are attached to and detached from the tip of the main shaft together with the fixing means. Further, a holding means at the rear end of the work and a shaft for rotatably supporting the holding means are arranged inside the main spindle, and the positioning means for the shaft is detachably provided on the main spindle body. By appropriately replacing the shaft, the shaft is displaced in the front-rear direction to position the holding means.

Further, the means for solving the above problems is a friction welding device for applying relative rotation and pressing pressure between a pair of works arranged coaxially, and a shaft is attached to a main shaft body. Having a cylindrical main shaft that is supported and can insert a work therein, a fixing means for the work is provided at the tip of the main shaft, and a power transmission means and a braking means for the main shaft are arranged in proximity to the outer wall of the fixing means. Inside the main shaft, a holding means for the rear end of the work and a shaft for rotatably supporting the holding means are arranged. As a positioning means for the shaft, a reference surface at the rear end of the shaft and the reference surface are provided. It is characterized in that a spacer interposed between the spacer and a predetermined portion of the main spindle body facing the spacer and a means for changing the thickness of the spacer are provided.

Also in the present invention, means for fixing the work,
The power transmission means to the main shaft and the braking means are exposed, and the rotational driving force and the braking force are directly transmitted to the fixing means. Further, the power transmission means and the braking means are arranged close to each other, and the braking force is directly transmitted to the driving means. Moreover, the power transmission means and the braking means are attached to and detached from the tip of the main shaft together with the fixing means. Further, as a positioning means for the shaft, a spacer is interposed between a reference surface of a rear end portion of the shaft and a predetermined portion of the main spindle body facing the reference surface to change the thickness of the spacer. Sometimes, the spacer is removed to position the shaft.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the present invention will be described below with reference to FIG.
It will be described based on. In the figure, the same or corresponding parts as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. In the following description, the right side of FIG. 1 is the front and the left side is the rear.

The friction welding device comprises a main shaft main body 20 mounted on a base 19.
And a clamp 21. The pair of works W ₁ and W ₂ are
It is fixed to the main spindle body 20 and the clamp 21, respectively.

The clamp 21 is for fixing the work W ₂ at a predetermined position on the base 19, and an X-axis clamp 21a for positioning the work W ₂ in the axial direction of the main shaft 1 and positioning in the left-right direction with respect to the axis. Y-axis clamp 21b that performs the operation and Z-axis clamp 21c that vertically positions the axis.
Consists of Then, by appropriately adjusting each shaft clamp, the work W ₂ can be fixed coaxially with the work W ₁ fixed to the main shaft 1.

The main spindle body 20 is attached to the base 19 via a linear guide 28, and is movable in parallel in the axial direction of the main spindle 1. Further, the main spindle body 20 has an arm 29 projecting into the base 19, and by transmitting the power of the driving means 30 such as a servomotor and a hydraulic piston to the arm 29, the main spindle body 20 is moved in the axial direction of the main spindle 1. Drive to.

The main shaft 1 is a main shaft main body via a plurality of bearings 3.
It is rotatably mounted on 20. The spindle 1 has a tubular shape,
The work W ₁ is inserted into the inside. Then, the work W ₁ is fixed by the chuck 2 which is a fixing means detachably provided at the tip of the main shaft 1. Further, the disc plate 22 is arranged between the tip of the main shaft 1 and the chuck 2, and the braking surface 221 is projected from the outer wall of the chuck 2. Further, the pulley 24 is fixed to the outer wall of the chuck 2, and the disc plate 22 is fixed to the pulley 24 and the chuck 2. The disc plate 22 and the caliper 23 supported by the main spindle body 20 form a braking means, so-called disc brake. The disc brake uses oil as a driving means for the piston inside the caliper 23, but since it is not necessary to fill the entire device with oil, the device is exposed. The driving force of the motor 25 is transmitted to the pulley 24 by a belt 27 wound around a driving pulley 26 fixed to the rotation shaft of the motor 25.

Since the disc plate 22 and the pulley 24 are attached to the chuck 2, the disc plate 22 and the pulley 24 are removed from the main shaft 1 by removing the chuck 2 from the tip of the main shaft 1. Further, the disc plate 22 and the pulley 24 are attachable to and detachable from the chuck 2. As described above, the portion requiring relatively maintenance is so-called “unitized” so that it can be easily attached to and detached from the spindle 1.

Further, the main spindle body 20 has an idle pulley 31
A sensor 32 is provided which is driven by the belt 27 via the sensor 32. The sensor 32 detects the rotation speed of the spindle 1 (that is, the work W ₁ ). In addition, the stroke sensors 33 and 33a are provided between the main spindle body 20 and the base 19, and the main spindle body 20
It is possible to measure the feeding speed and the feeding amount of the workpiece (that is, the work W ₁ ). Further, a load sensor (not shown) is provided on the arm 29 so that the spindle main body 20 (that is, the work W ₁ )
It is possible to measure the pressing pressure applied to.

By the way, inside the main shaft 1, a hollow bar 34
Work W through₁ Stopper 35, which is the means for holding the rear end
Is provided. The stopper 35 is a work inserted into the spindle 1.
Ku W ₁ Determine the insertion limit position of the
Work W₁ The hollow bar that receives the reaction force applied to
Can rotate with 34. The hollow bar 34
Provided on the operating portion of the fixed claw 2a of the crank 2 and the rear end of the main shaft 1.
The rotary cylinder 36 and the plunger 361
It is slidable with respect to the inner cylinder part 1. Rotating syringe
Plunger 361 of Da 36 has a hollow shape, and plunger 361
And the cylinder body that drives the plunger (not shown)
(Not shown) is rotatable with respect to the casing 362.
You. In addition, is the operating portion of the fixed claw 2a of the chuck 2 external?
It has a structure that opens and closes by receiving pulling force and pushing force
You. Therefore, the plunger 361 of the rotary cylinder 36
By driving in the linear direction, it is possible to
The fixed claw of the hook 2 can be opened and closed. Rotating cylinder
36 is a guide bracket 201 to be described later from the main spindle body 20.
It can be exposed to the outside of the device by removing it.
Therefore, maintenance can be easily performed.

The stopper 35 is supported at the tip of the shaft 38 via a bearing 37 in which a thrust bearing and a radial bearing are integrated. The shaft 38 penetrates the inner cylindrical portion of the hollow bar 34 and the plunger 361 of the rotary cylinder 36,
Guide bracket 201 of spindle body 20 via bush 39
It is supported non-rotatably. Furthermore, the rear end of the shaft 38 protrudes rearward from the guide bracket 201,
38 Adjusting bracket 40 for positioning the rear end
Is in contact with The adjustment bracket 40 is attachable to and detachable from the guide bracket 201. Further, at the contact portion of the adjusting bracket 40 with the shaft 38, a detachable spacer or stopper shim 401 is attached.
have. As the stopper shim 401, a plurality of stopper shims having different thicknesses can be prepared and can be replaced appropriately. The adjustment bracket 40 can also be used with the stopper shim 401 removed.

In the friction welding device having the above construction, when the length of the work W ₁ is changed, the shaft 38 is moved back and forth to displace the stopper 35 inside the hollow bar 34. The shaft 38 is positioned further forward by increasing the thickness of the stopper shim 401 attached to the adjustment bracket 40. On the contrary, by reducing the thickness of the stopper shim 401, the stopper shim 401 is positioned further rearward, and when the stopper shim 401 is removed, the shaft 38 is positioned at the rearmost portion of its movement range. The adjustment bracket 40 is the guide bracket 2
It is detachable from 01, and the replacement work of the stopper shim 401, that is, the positioning work of the shaft 38 can be performed easily and quickly.

The operation and effect obtained from the embodiment of the present invention having the above structure are as follows. The disc plate 22 is arranged between the tip of the spindle 1 and the chuck 2, and the pulley 24 is fixed to the outer wall of the chuck 2 to form the disc plate.
22 is fixed to the pulley 24 and the chuck 2. Therefore,
Driving force of motor 25, disk plate 22 and caliper
Since the braking force of the braking means formed by 23 and 23 is directly transmitted to the chuck 2 that fixes the workpiece W ₁ , the force transmission efficiency is improved and an unreasonable load is applied to each part of the device. The consumption of the device can be reduced. Further, the braking means and the power transmission means such as the pulley 24 and the belt 27 are exposed on the outer wall of the chuck 2, and the chuck 2,
Since the disk plate 22 and the pulley 24 are detachable from the tip of the main shaft 1, there is no need to remove the main shaft 1 from the device when attaching / detaching each, and maintenance such as replacement and repair of each part including the belt 27 is performed. The property becomes good.

Further, even when the works W ₁ having different lengths are used, the positioning work of the stopper 35 can be performed by exchanging the stopper shim 401 attached to the adjusting bracket 40, so that the positioning structure of the stopper 35 can be achieved. It is simple and the positioning work can be performed easily and quickly. By using the above spindle structure, it is possible to concentrate the transmission positions of the driving force and the braking force to the spindle, simplify the structure of the stopper 35, and downsize the entire device.

Next, a second embodiment of the present invention will be described with reference to FIG.
A description will be given with reference to FIG. The same parts as or corresponding parts to those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The difference between this embodiment and the first embodiment is that the positioning of the shaft 38 is performed by adjusting the adjustment bracket.
This is because it has a configuration that is performed without attaching and detaching 40, and enables the positioning of the stopper 35 (FIG. 1) to be performed more easily and quickly. By the way, FIG. 2 is a plan view showing the structure of the rear end portion of the shaft 38 in the second embodiment, where the upper and lower sides of FIG. 2 are the front-rear direction and the left and right sides are the left-right direction. Also, FIG.
FIG. 3 is a front view of the vicinity of the rear end portion of the shaft 38 shown in FIG. Further, FIG. 4 is a vertical cross section taken along the line AA in FIG. 3, and FIG. 5 is a side view taken along the arrow B in FIG.

First, the structure for enabling the shaft 38 to be positioned without attaching or detaching the adjusting bracket 40 will be described. As shown in FIGS. 2 and 4, the shaft 38 is provided at its rear end with small diameter portions 381, 382 and two enlarged diameter portions 383, 384. Then, the guide bracket 201 has a through hole 201 through which the small diameter portion 381 can be inserted.
The small diameter portion 381 is supported slidably in the axial direction. Further, the small diameter portion 382 is inserted through the guide hole 511 of the bracket 51 formed in the intermediate portion of the lever 50. As shown in FIG. 3, the guide hole 511 has an arc shape centered on the base end 501 of the lever 50. The width of the guide hole 511 (see FIG. 2) is smaller than that of the small diameter portion 382 of the shaft 38.
The diameter is larger than the diameter and smaller than the large diameter portions 383 and 384, and the shaft 38 is swingably supported so as not to fall off from the bracket 51.

The lever 50 has a base end portion as shown in FIG.
501 is a ball joint, supported by the hinge bracket 52 fixed to the guide bracket 201,
It is rotatable in all directions. Also, lever 50
The part beyond the bracket 51 of is the guide bracket 2
Guide hole 53 of the guide plate 53 (Fig. 5) fixed to 01
1, the tip portion 502 extends from the bracket 51 at a predetermined distance. The guide hole 531 of the guide plate 53 has a vertical hole extending vertically as shown in FIG. 5 and a horizontal hole extending rearward (to the right in FIG. 5) to form a substantially L shape. Further, the width thereof is formed so that the lever 50 can move in the guide hole 531 without resistance.

By the way, the small diameter portion 381 of the shaft 38 is formed a predetermined length longer than the length of the insertion hole 201a of the guide bracket 201 as shown in FIG. And, in the portion of the difference in length between the insertion hole 201a and the small diameter portion 381,
A spacer 55 and a spring 56 are arranged. As shown in FIG. 4, the spacer 55 is in front of the guide bracket 201 (leftward in FIG. 4), and the spring 56 is in the guide bracket 201.
It is placed behind the 201 (rightward in FIG. 4) and between the expanded diameter portion 383.

The spacer 55 is a hinge bracket 52.
It is a plate that is rotatably supported by a hinge pin 54 that is arranged coaxially with and has a substantially L shape as shown by the dotted line in FIG. And the spacer 55 is the hinge pin 54.
(Fig. 2) Extends from one end 551 pivotally supported by (Fig. 2) toward the shaft 38, and cuts out 552 into the small diameter portion 381 of the shaft 38.
Is engaged with. The spacer 55 extends upward here, and the other end 553 is slightly projected from the upper surface of the guide bracket 201. The other end 553 is a cam plate fixed to the bracket 51 of the lever 50 as shown in FIGS. 2 and 4.
It is connected to 57 by a guide pin 58. A guide hole 571 is formed in the cam plate 57,
The 58 is inserted into this guide hole 571 so that it can be freely moved inside.

Now, the operation of each part when the shaft 38 is positioned by the positioning device having the above structure will be described. In the present embodiment, the spacer
The shaft 38 is positioned by the thickness of the spacer 55 depending on whether the shaft 55 is engaged with or disengaged from the shaft 38. 2 to 5 show a spacer 55 and a shaft.
38 is in the engaged state. At this time the shaft 38
Is urged rearward (downward in FIG. 2) by the extension action of the spring 56 interposed between the large-diameter portion 383 and the guide bracket 201, and the shaft 38 of the shaft 38 formed at the base end portion of the small-diameter portion 381. The stepped portion (the surface generated at this stepped portion is referred to as a reference surface S. Refer to FIG. 4 for the reference surface S), (reference surface S
It is pressed against the spacer 55, which is a predetermined part of the main body of the spindle facing the above). As a result, the shaft 38 is positioned in the axial direction.

From this state, when releasing the engagement between the spacer 55 and the shaft 38, the tip portion 502 of the lever 50 is
Pull up along the guide holes 531 of the guide plate 53.
At this time, the lever 50 is rotated about the base end 501 as shown in FIG.
Rotate in the clockwise direction at. At this time, the guide hole 511 of the bracket 51 is also displaced clockwise with respect to the small diameter portion 382 of the shaft 38. At the same time, the displacement of the bracket 51 is transmitted to the spacer 55 by the cam plate 57, and the spacer 55 rotates clockwise about the hinge pin 54 in FIG. As described above, since the hinge bracket 52 that supports the base end 501 of the lever 50 and the hinge pin 54 that pivotally supports the spacer 55 are coaxially arranged, the bracket 51 and the spacer 55 are the same. Rotate along the circumference of the circle. As the spacer 55 rotates clockwise in FIG. 3, the engagement between the notch 552 of the spacer 55 and the small diameter portion 381 of the shaft 38 is released. Then, when the lever 50 is pulled up to the uppermost end of the vertical hole portion of the guide hole 531 of the guide plate 53, the engagement between the spacer 55 and the shaft 38 is completely released.

Then, the reference plane S and the guide bracket 201
A gap corresponding to the thickness of the spacer 55 is formed therebetween. As described above, the shaft 38 is biased rearward (downward in FIG. 2) by the extension action of the spring 56. Therefore, the expansion action of the spring 56 causes the shaft 38 to move rearward, canceling the gap generated here. Also, the spring 56
The shaft 38 urged rearward by the
Is pressed against the guide bracket 201 (which is a predetermined portion of the main spindle body facing the reference plane S) to position the shaft 38. At this time, the lever 50 follows the displacement of the shaft 38 by moving the guide hole 531 of the guide plate 53 rearward along the lateral hole portion thereof. At the same time, the cam plate 57 also follows the displacement of the shaft 38 by moving the guide hole 571 rearward with respect to the guide pin 58.

Further, when the spacer 55 and the shaft 38 are engaged again, the lever 50 is moved forward along the guide hole 531 lateral hole portion of the guide plate 53, and the spring is moved.
The shaft 38 is moved forward against the elastic force of 56.
Then, a gap is formed between the reference surface S and the guide bracket 201 by the thickness of the spacer 55. Then, by moving the lever 50 downward along the guide hole 531 vertical hole portion of the guide plate 53, the spacer 55 is rotated counterclockwise in FIG. By this operation, the notch 552 of the spacer 55 and the small diameter portion 381 of the shaft 38 engage with each other, and the shaft 38 is positioned forward by the thickness of the spacer 55.

By the way, in the above description, the thickness of the spacer 55 is assumed to be uniform, but the thickness of the spacer 55 is gradually increased as it is rotated clockwise in FIG. Or, if it is formed so as to decrease continuously, it is possible to set various positions where the shaft 38 is positioned within the range of the change in the thickness.

The operational effects obtained from the second embodiment of the present invention having the above structure are as follows. In the present embodiment, it is possible to move the spacer 55 inside the guide bracket 201 by operating the lever 50 exposed to the outside of the guide bracket 201. Then, by engaging or releasing the spacer 55 and the reference surface S of the shaft 38, a means for changing the thickness of the spacer is formed to position the shaft 38. Therefore,
As in the first embodiment, the shaft 38 can be positioned without attaching and detaching the adjusting bracket 40, and the stopper 35 (FIG. 1) can be positioned more easily and quickly. . Also, spacer 55
It is possible to set various positions that can be positioned by decreasing the thickness of the stepwisely or continuously as it rotates clockwise in FIG. It is easy to handle workpieces of various lengths. It should be noted that the description of the other functions and effects similar to those of the first embodiment is omitted here.

[0038]

According to the present invention, the following advantageous effects can be obtained as compared with the conventional friction welding device. By attaching the power transmission means to the main shaft and the braking means to the work fixing means detachably provided at the tip of the main shaft, the power transmission means and the braking means can be attached to and removed from the main shaft together with the fixing means. it can. Therefore, it is not necessary to remove the main shaft from the device at the time of maintenance, and the parts of each part can be easily attached and detached. Therefore, the maintainability of the device can be improved. Further, since the power transmission means and the braking means are arranged close to each other, the rotational driving force and the braking force of the main shaft are directly transmitted to the work fixing means,
The power transmission efficiency can be improved. Moreover, unlike the conventional case, an unreasonable load is not applied to the device such as a torsional stress applied to the main shaft, so that the durability can be improved.

Further, the holding means of the rear end of the work provided inside the main shaft is rotatably supported by the shaft, and the positioning means for the shaft is detachably provided on the main body of the main shaft, so that the positioning means is appropriately provided. By exchanging the shaft, the shaft can be displaced in the front-rear direction and the holding means can be positioned. According to this type, the structure is simple and the positioning means can be easily attached and detached, so that the positioning work can be performed easily and quickly.
By using the above-described structure, it is possible to reduce the size as compared with the conventional friction welding device, so that the installation place can be set more freely.

As a shaft positioning means, a spacer is interposed between a reference surface at the rear end of the shaft and a predetermined portion of the main shaft body facing the reference surface, and the thickness of the spacer is adjusted. When the changing means is provided, it becomes easy to position the holding means by changing the presence or absence of the spacer or changing the thickness, and it is possible to hold a work having various dimensions more appropriately and always. It is possible to provide high quality products. Further, since the positioning work of the holding means is facilitated, an increase in the number of steps required for this is prevented,
The non-operation time of the device can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a friction welding device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a structure in the vicinity of a shaft rear end portion of a friction welding device according to a second embodiment of the present invention.

FIG. 3 is a front view of the vicinity of the rear end portion of the shaft shown in FIG.

4 is a vertical sectional view taken along the line AA of FIG.

5 is a side view taken along the arrow B in FIG.

FIG. 6 is a schematic view showing a main shaft structure in a conventional friction welding device.

7 is a perspective view of a main part showing a positioning structure of a holding means at a rear end of a work in the friction welding apparatus of FIG.

[Explanation of symbols]

1 spindle 2 chuck 3 bearing 20 spindle body 21 clamp 22 disc plate 23 caliper 24 pulley 27 belt 35 stopper 37 bearing 38 shaft 40 guide bracket 401 stopper shim W ₁ workpiece W ₂ workpiece

Claims (2)

[Claims] 1. A friction welding device for applying relative rotation and pressing pressure between a pair of works arranged coaxially, comprising:
A cylindrical main shaft that is axially supported by the main shaft body and through which a work can be inserted, and a fixing means for the work is provided at the tip of the main shaft;
Power transmission means to the main shaft and braking means are arranged close to each other on the outer wall of the fixing means, and holding means at the rear end of the work and a shaft for rotatably supporting the holding means are arranged inside the main shaft. A friction welding device, wherein the shaft positioning means is detachably provided on the main spindle body. 2. A friction welding device for applying relative rotation and pressing pressure between a pair of works arranged coaxially,
A cylindrical main shaft that is axially supported by the main shaft body and through which a work can be inserted, and a fixing means for the work is provided at the tip of the main shaft;
Power transmission means to the main shaft and braking means are arranged close to each other on the outer wall of the fixing means, and holding means at the rear end of the work and a shaft for rotatably supporting the holding means are arranged inside the main shaft. As the shaft positioning means, there are provided a spacer interposed between a reference surface of the shaft rear end portion and a predetermined portion of the main spindle body facing the reference surface, and a means for changing the thickness of the spacer. A friction welding device characterized by being provided.