JPS60244497A - Clamping equipment - Google Patents

Abstract

PURPOSE:To provide the titled equipment preventing the slipping-off of the axial line of a material to be worked by clamping with relative movement of opposite clamp claws against the clamp axial line and by braking with the final independent hydraulic pressure in the mechanism to press-contact two materials to be worked with a clamping approach. CONSTITUTION:A fixed clamping equipment 3 on the main body 1 of a magnet arc welding equipment approaches and press-contacts the materials to be worked W, W' by the cylinder 6 of the clamping equipment 7 on a sliding base 4. The clamp claws 20, 21 of the clamping equipment 3 and clamp claw stands 18, 19 are respectively fastened to cylinder devices 12, 13 positioned on a sliding plate 11. Racks 31, 32 are respectively equipped to the cylinder devices 12, 13 and moved relatively to the right and left against the central clamp axial line with a central and vertical pinion 30. If, therefore, the material W to be worked is clamped, there is no slipping-off in the axial line and the centering is good even in the oil pressure fastening of the final cylinder devices 12, 13.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a clamping device used to clamp a workpiece in a predetermined position during machining, such as magnetic arc welding or friction welding. It is.

(Prior Art) Conventionally, as a device for clamping a workpiece at a predetermined position during machining, there is a chuck device provided with a plurality of jaws that move in the radial direction.

(Problems to be Solved by the Invention) However, such a chuck device can be applied when the workpiece is a round bar, pipe member, etc. having a predetermined shape and dimensions, but when the workpiece is It cannot be applied when the object has a complicated shape or is long in size, and its range of application is extremely limited.

On the other hand 1. For example, when a front side member and a rear side member are clamped by the chuck device and friction welded, such as in an automobile muffler, these members have been previously processed in a specified manner, so it is difficult to join the two members together. The parts are eccentric to each other and the axes are misaligned.

There is a problem that the joints do not fit well.

(Means for Solving the Problems) The present invention solves the above problems, and the technical means of this specific invention is to provide a pair of cylinder devices to a pair of clamp claws that are movably provided facing each other. between a pair of racks that are individually connected and individually attached to the pair of cylinder devices,
The device is characterized in that a pinion that meshes with the pair of racks is rotatably provided.

When clamping a workpiece using the clamp device having such a configuration, the workpiece is set between a pair of clamp claws, and then the pair of cylinder devices is operated.

Then, the pair of cylinder devices operate in synchronization with each other via the pair of racks and pinions attached to the cylinder devices.

A pair of clamp claws clamps the workpiece equally from both sides. Therefore, even if the workpiece has a complicated shape, the workpiece can be clamped at a predetermined position coaxially with the pair of clamp claws.

Further, the technical means of this related invention is such that a hollow portion is provided between the pair of clamp nails on the distal end side of the pair of clamp nails which are movably provided facing each other, and is integral with the pair of clamp nails. A pair of straightening claws that move in the same direction are disposed coaxially with a pair of clamp claws, a pair of cylinder devices are individually connected to the pair of clamp claws, and a pair of racks individually attached to the pair of cylinder devices are connected to the pair of clamp claws. It is characterized by a rotatably provided pinion that meshes with the pair of racks.

In this way, on the tip side of the pair of clamp claws.

If a pair of straightening claws that move together with the straightening claws are disposed coaxially with the pair of clamp claws, the proximal end portion of the workpiece is clamped by the pair of clamp claws.

In addition, since the tip end portion of the workpiece can be clamped with a pair of straightening claws, even if the axes of two workpieces are deviated when joining them facing each other, this can be corrected. can.

(Example) An example of the present invention will be described below with reference to the drawings. 5 and 6 show an example in which the clamping device of the present invention is applied to a magnetic arc welding device, in which a clamping device 5 equipped with an electromagnetic coil 2 is fixed to the upper part of the main body 1 of the magnetic arc welding device. It is provided. The electromagnetic coil 2 uses a magnetic force to rotate an arc generated between a pair of workpieces w and w' to weld the workpieces w and w'.
It has the function of melting the joint end surface of w'.

In addition, on the top of the magma arc welding device main body 1,
A slide base 4 is attached to the clamp device 3 so as to be slidable in the direction of moving away from and approaching the clamp device 3 (AA' direction). Bracket 5 connected to magnetic arc welding device main body 1
At the top of the.

A pressurizing cylinder 6 is arranged in the same direction as the moving direction of the slide base 4.

A clamp device ii7 facing the clamp device 3 is connected to the tip of the cylinder rod 6a of the pressurizing cylinder 6. The lower part of the clamp device 7 is fixed to the slide base 4, and as the cylinder rod 6a of the pressure cylinder 6 expands and contracts, it moves away from and approaches the clamp device 5. 8 and 9 are work receivers attached to the clamp devices 3 and 7.

Next, the structure of the clamp device 3.7 according to the present invention will be explained in detail. Note that since the clamp devices 5 and 7 have the same structure, only the clamp device 3 will be described here, and a description of the clamp device 7 will be omitted.

1 to 3, reference numeral 10 denotes a base fixed to the main body 1 of the magma arc welding apparatus, and a slide plate 11 is mounted on the top of the base 10 in the longitudinal direction of the base 10 (AA in Figure 6). It is fixed in the B' direction, which is perpendicular to the B' direction. A pair of clamp cylinder devices 1 are mounted on the slide plate 11.
2.15 is slidably disposed in the BB' direction in FIG.
Cylinder rod 12 of clamp cylinder device 12.13
One end portions of a and 13a are respectively connected to side plates 14 and 15 fixed to the main body 1 of the magnetic arc welding casing via pins 16 and 17. On opposite sides of the clamp cylinder devices 12, 13.

A pair of clamp claw stands 1B and 19 are respectively attached.

A pair of arc-shaped clamp claws 20 and 21 are attached to the clamp claw stands 1B and 19, respectively.

More specifically, the above-mentioned clamp cylinder device 12.1
Since the structures of the clamp cylinder devices 13 and 3 are similar to each other, the structure of the clamp cylinder device 13 will be described below.

As shown in FIG. 1, the tip of the cylinder block 22 of the clamp cylinder device 16 is attached to the clamp claw rest 19, and a third
As shown in the figure, a sliding groove 23 is formed. The sliding groove 23 is fitted into the sliding plate 11 so as to be slidable in the direction BB' in FIG. A cylinder tube 24 is fitted into a cylinder hole formed in the cylinder block 22 .

A piston 25 is slidably inserted into a cylinder hole of the cylinder block 22, and a cylinder rod 15m connected to the piston 25 is connected to the side plate 1 by a pin 17.
It is fixed at 5.

Reference numerals 26 and 27 indicate hydraulic pressure supply passages bored in the cylinder rod 15m, the hydraulic pressure supply passage 26 communicating with the head side chamber of the clamp cylinder device 15, and the hydraulic pressure supply passage 27 communicating with the rod side chamber of the clamp cylinder device 13. Note that 28 is a lubricating oil supply path bored in the slide plate 11 for supplying lubricating oil to the sliding surface of the slide plate 11.

29 is a helad cap.

Therefore, when hydraulic pressure is supplied from a hydraulic power source (not shown) to the head side chamber of the clamp cylinder device 13 via the hydraulic pressure supply path 26, the clamp claw 21 moves forward in the direction B in FIG. Further, when hydraulic pressure is supplied to the rod side chamber of the clamp cylinder device 13 via the hydraulic pressure supply path 27, the clamp claw 21 retreats in the direction B' in FIG.

The operation of the clamp cylinder device 12 is similar to that of the clamp cylinder device 13, and when hydraulic pressure is supplied to the head side chamber of the clamp cylinder device 12, the clamp claw 20 moves forward in the direction B' in FIG.

Further, when hydraulic pressure is supplied to the rod side chamber of the clamp cylinder device 12, the clamp claw 20 retreats in the direction B in FIG.

Next, the synchronization means of the clamp cylinder device 12.15 will be explained. 30 is a pinion, and the pinion 50 has teeth located at the center of the top of the base 10 (directly below the center when the workpiece W is clamped by the clamp claws 20 and 21) as shown in FIG. It is rotatably recessed so that it protrudes from both the top and bottom sides. A rack 31 meshes with one side of the pinion 60, and a rack 32 meshes with the other side of the pinion 30.

The rack 31 is attached to the lower part of the clamp cylinder device 12 so as to be in close contact with the lower surface of one side of the slide plate 11. A guide plate 35 facing the rack 31 is attached to the lower part of the clamp cylinder device 12 so as to be in close contact with the lower surface of the other side of the slide plate 11. The rack 32 is located at the lower part of the clamp cylinder device 13 and faces the rack 31.
It is mounted so as to be in close contact with the lower surface of the other side of the slide plate 11. A guide plate 34 facing the rack 32 is attached to the lower part of the clamp cylinder assembly R15 so as to be in close contact with the lower surface of one side of the slide plate 11.

Therefore, the rack 31 attached to the clamp cylinder device R12 and the rack 32 attached to the clamp cylinder device 15 face each other and mesh with the pinion 30, so that the clamp cylinder device ji12 is positioned at B' in FIG.
1, the clamp cylinder device 13 moves in the direction B in FIG. 1 in synchronization with the clamp cylinder device 12 by an amount corresponding to the amount of movement.

Further, the clamp cylinder device R12 is disposed by a rack 51 and a guide plate 33, and the clamp cylinder device 15 is disposed by a rack 52 and a guide plate 34, respectively, so as to sandwich the slide plate 11 and fit with the slide plate 11. Therefore, the workpiece W is held between the pair of clamp claws 20.
．． 21 makes it possible to clamp extremely stably and reliably even when clamping with a considerably large pressure, and to obtain high clamping accuracy.

Reference numeral 35 denotes a stopper attached to the clamp cylinder device 12. Even if the clamp cylinder device 12.15 is operated without clamping the workpiece W to be welded and the clamp claws 20.21 are moved forward, , has a function of preventing the clamp claws 20 and 21 from coming into contact with each other and being damaged.

Next, the operation of this embodiment will be explained. Here, a case will be described in which long pipe members are subjected to magnetic arc welding as objects to be welded w and w'.

First, with the clamp devices 3 and 7 open,
A pair of objects to be welded w and w' are placed opposite each other and the workpiece receivers 8 and 9
Then, the clamp cylinder device 12.1 is placed on the clamp cylinder device 12.
Hydraulic pressure is supplied to each of the head side chambers of No. 5. Then, the cylinder block 22 of the clamp cylinder device 12.13
', 22 move forward in the direction approaching each other, the clamp claws 20 and 21 attached to the cylinder blocks 22', 22 also move forward in the direction approaching each other, and the objects to be welded w, w' move forward in the direction approaching each other. and 7 clamp claws 20.
21, the objects to be welded w and w' are simultaneously clamped from both sides.

When the objects to be welded w and w' are clamped by the clamp devices 3 and 7, a predetermined magnetic arc welding cycle is performed, and the joint end surfaces of the objects to be welded w and w' are pressed together.
Joined. That is, the pressure cylinder 6 is operated to extend the cylinder rod 6a, and the joint end surface of the workpiece W' is brought into contact with the joint end surface of the workpiece W.
is activated again to separate the workpiece W' from the workpiece W by a predetermined distance, an arc is generated between the workpieces w and w', and this arc is rotated by the magnetic force of the electromagnetic coil 2.
After melting the joining end surfaces of the objects to be welded w and w', and after melting the joining end surfaces of the objects to be welded w and w', the objects to be welded W and W' are pressed and joined by operation of the pressure cylinder 6. .

When the objects to be welded w and w' are joined, the hydraulic pressure supply to the head side chamber of the clamp cylinder device 12.13 is stopped, and the rod of the clamp cylinder device 12.13 is then supplied via the hydraulic pressure supply paths 27' and 27. Hydraulic pressure is supplied to the side chamber.

When hydraulic pressure is supplied to the rod side chamber of the clamp cylinder device R12#15, the cylinder blocks 22' and 22 retreat in a direction away from each other. Then, along with this, the clamp claws 20 and 21 also retreat in the direction away from each other, and
The clamp devices 3 and 7 are in an open state. Clamp device 3
When ゜7 reaches the open state t, the joined workpiece w,
w' is removed from the work receivers 8 and 9, and the welding cycle is completed.

In this embodiment, a pair of clamp cylinder devices 12
．． 13 is a pair of racks 31.32 and both 31.5
The objects to be welded w and w' are simultaneously clamped from both sides by the pair of clamp claws 20 and 21 with equal force, so that the pair of clamp claws 20 and 21 On the same axis, the objects to be welded W, W/ are securely clamped, and the objects to be welded, W, W'
It is easy to install and can be clamped with considerable tolerance.

Next, other embodiments of the present invention will be described.

Here, only the parts that are different from the clamp device of the previous embodiment will be explained with reference to FIG. 4.

In Fig. 4, 2 is a clamping device (numeral 3 in Fig. 5)
An electromagnetic coil is attached to the clamp device ζ, and reference numeral 19 is a clamp claw stand provided with the clamp device ζ.A circular arc-shaped correction claw body 36 is attached to the clamp claw base 19, and the correction claw body 36 has a correction claw 37 at its tip. have. A hollow portion 4o is formed between this correction claw 37 and an arc-shaped clamp claw 39 attached to the attachment portion 3 on the proximal end side of the correction claw main body 36. The arc-shaped clamp claw 69 is attached so as to be coaxial with the correction claw 57. Reference numeral 41 indicates a tooth portion formed on the clamp claw 39, and reference numeral 42 indicates a presser plate for attaching the clamp claw 39 to the mounting portion 38.

Note that components on the clamping device (number 7 in FIG. 5) are indicated by adding a dash to the corresponding component on the clamping device (number 3 in FIG. 5), and their explanations are omitted. do.

As in this embodiment, in front of the clamp claw 59, 39',
When the straightening claw 57.37' that moves together with the clamping claw 39.59' is disposed coaxially with the clamping claw 39.37', the clamping claw 39.3
9' can clamp the proximal parts of the welded objects w, w', and the straightening claws 57 and 57' can clamp the distal end parts of the welded objects w, w'. , W' facing each other by magnetic arc welding, even if the axes of the pair of welded objects w and w' are eccentric and deviated, this can be corrected to the -axis. Therefore, with the axes of the welded objects W 1 and W' aligned with each other, the welded objects W 1 and W' can be satisfactorily joined, and welding quality can be greatly improved.

In the above embodiments, the case where two workpieces are arranged facing each other and the two are joined together has been described, but the present invention is not limited to this. Of course, ζ can also be applied when machining is performed by clamping.

(Effect of the invention) According to the clamp device of the specific invention, a pair of clamp claws are moved by a pair of cylinder devices that operate synchronously, and a workpiece is simultaneously clamped by the pair of clamp claws with equal pressure from both sides of the workpiece. As a result, even workpieces with complex shapes can be easily clamped on the predetermined axis. This has the effect of making it easier and greatly contributing to automated systems.

According to the clamp device of the related invention, a pair of straightening claws that move together with the pair of clamp claws are provided coaxially with the pair of clamp claws on the distal end side of the pair of clamp claws, and the proximal end portion of the workpiece is fixed to the clamping claws. Clamp with nails, and.

Since the tip end portion of the workpiece can be clamped by the correcting claw, even if the axis of the workpiece is eccentrically deviated, this can be easily corrected.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the present invention. FIG. 2 is a plan view of FIG. 1, FIG. 3 is a side view of the first prisoner, FIG. 4 is a sectional view showing another embodiment of the present invention, and FIG. FIG. 6 is an overall front view showing the welding device applied to the welding device. FIG. 6 is a plan view of FIG. 5. 1... Magnetic arc welding device main body, 3, 7...
Clamp device, 12.13... Clamp cylinder device. 20, 21... Clamp claw, 30... Pinion, 3
1j2...Rack, 36.56'...Correction nail body,
57.37'...Correction claw, 39, 39'...Clamp claw, 40.40'...Hollow part, w, w'...Welded object

Claims (2)

[Claims] (1) A pair of clamp claws that are movably provided facing each other, a pair of cylinder devices that are individually connected to the pair of clamp claws, and a pair of racks that are individually attached to the pair of cylinder devices. . A clamp device comprising a pinion rotatably provided between the pair of racks and meshing with the pair of racks. (2) A pair of clamp claws that are movably provided facing each other, and a hollow portion that is arranged coaxially with the distal ends of the pair of clamp claws, and that has a hollow space between the pair of clamp claws. a pair of straightening claws that move together with the clamp claws; a pair of cylinder devices individually connected to the pair of clamp claws; a pair of racks individually attached to the pair of cylinder devices; A clamping device comprising a pinion rotatably provided between two racks and meshing with the pair of racks.