JPH0122074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction welding machine particularly suitable for welding rotary cross-section joints, such as elongated objects, non-linear members, or members fixed on one side in the field.

Friction welding is a method of welding members with rotating cross-sections, such as round bars or pipes, by pressing them against each other while rotating one of them, and by utilizing the frictional heat generated at the contact area. It has the excellent feature of being able to weld with good joint performance in an extremely short time.

However, conventional friction welding machines are installed in a factory and weld a pair of objects to be welded by attaching them to the machine. The member to be rotated can only be attached to and removed from the device in the direction of the rotation axis. Therefore, after welding is complete, both members must be removed in the axial direction to the rotation side, and then in the direction perpendicular to the axis. was forced to remove it. Therefore, it cannot be applied to long pipes, round bars, non-linear members, or steel pipe structures or piping where one side is fixed on site, and the range of application is limited.

In view of the above-mentioned circumstances of conventional friction welding machines, it is an object of the present invention to provide a friction welding machine that is particularly applicable to welding long objects, bent members, large structures, on-site piping, etc.

The purpose of this is to coaxially hold the ends of two objects to be welded by clamp units, and insert a short intermediate material with a corresponding cross section between the objects to be welded. are inserted coaxially, and by rotating only this intermediate material and pulling the objects to be welded on both sides toward each other, the end faces of these and both end faces of the intermediate material are pressed together, and both joints are simultaneously friction welded. At the same time, the objects to be welded and the intermediate materials can be attached to and detached from the apparatus by relatively moving them in a direction perpendicular to the axial direction.

Hereinafter, the present invention will be explained in detail based on drawings showing embodiments thereof.

The apparatus of the embodiment shown in FIGS. 1 and 2 includes a pressure unit 10 that grips one workpiece 1 and a pressure unit 10 that holds the other workpiece 2 coaxially with the gripping portion of the workpiece 1. The clamp unit 20 to be gripped and the intermediate member 3 located between them and having a cross section matching the joint section of the welded objects 1, 2 are attached to the welded objects 1, 2.
The intermediate material rotating unit 30 is rotatably held coaxially with the gripping portion of No. 2.

As shown in FIG. 2, the pressurizing unit 10 is provided with a slit 11 reaching from one side to the center, and the workpiece 1 to be welded can be attached and detached from the side in a direction perpendicular to the axis, and is gripped by means not shown. It's becoming like that. Two pressurizing hydraulic cylinders 1 are provided on the end surface of the pressurizing unit 10 on the opposite side from the intermediate material rotation unit.
2 is fixed, and its piston rod 13 slidably passes through guide holes formed in the pressure unit body 10 and the intermediate material rotation unit 30, respectively, and its tip faces the intermediate material rotation unit of the clamp unit 20. It is fixed to the end face. Therefore, the pressure unit 10 is a clamp unit having pressure means.

The clamp unit 20 is also provided with a slit 21 similar to that of the pressure unit 10 in the same direction.
The workpiece 2 to be welded can be attached and detached in a direction perpendicular to the axis and can be held at a predetermined welding position in the center using a device (not shown).

The intermediate material rotation unit 30 is also provided with a slit 31 from the center in the same direction as the slits 11 and 21 of the pressure unit 10 and the clamp unit 20, and the intermediate material 3 can be attached and removed in a direction perpendicular to the axis.
It can be rotatably held at a predetermined rotational position at the center during welding. FIG. 3 shows an example of means for rotatably holding the intermediate material 3 in a predetermined position. As described above, the housing of the intermediate material rotation unit 30 is provided with a slit 31 extending from the center through which the intermediate material 3 passes during welding to one side. There are 3 inside the housing.
gears 32, 33, 34 with the same diameter and the same number of teeth
The gear 32 is pivotally supported by the housing, and is rotationally driven by a drive motor 35 fixed to the housing via a belt or the like. gear 3
3 and 34 are pivotally supported at the ends of arms 36 and 37, respectively, which swing around the axis of gear 32, and are bridged between pulleys provided on the shaft of gear 31 and pulleys provided on the shafts of gears 33 and 34. The gear 31 is
It is rotated in the same direction and at the same speed. Prior to mounting the intermediate material 3 on the intermediate material rotation unit 30, a gear block 38 is fixed to the outer periphery of the intermediate material 3 and inserted into the slit 31. An opening 39 through which a gear block 38 can enter and exit is provided on the side surface of the housing where the slit 31 opens. When inserting an intermediate material or taking out a welded workpiece, the gears 33 and 34 are opened so that the gear block 38 can pass through, and after being inserted into a predetermined welding position, all of the gears 32, 33, and 34 mesh with the gear block 38. brought to and fixed. Pressure unit 10 is installed in the housing.
The piston rod 13 of the pressurizing hydraulic cylinder 12
A through hole 40 is provided which is slidably fitted into the. Further, the intermediate material rotation unit 30 is also provided with a burr cutting machine (not shown).

Since this device is constructed as described above, the objects to be welded 1 and 2 are inserted into the pressure unit 10 and the clamp unit 20 at right angles to the axial direction, and are gripped.
A gear block 38 is fixed to the intermediate material 3, and is inserted into the intermediate material rotation unit 30 at right angles to the axial direction to hold it rotatably. In this state, the gripped portions of the objects 1 and 2 on both sides and the intermediate material 3 are coaxially aligned. Therefore, the gear 32,
33 and 34 to rotate the intermediate material 3 together with the gear block 38, the pressurizing unit 10 is rotated.
actuate the hydraulic cylinder 12 of the piston rod 1.
3 into the cylinder, clamp unit 2
0 is drawn toward the pressure unit 10, and the end surfaces of the materials to be welded 1 and 2 are pressed against both end surfaces of the rotating intermediate material 3 with equal pressure, and friction welding is performed at the same time. In addition, if necessary, an auxiliary hydraulic system may be installed between the pressure unit 10 and the intermediate material rotation unit.
It is also possible to provide a function to adjust the margins between both of the welded materials 1 and 2 and the intermediate material 3 to be equal.

After welding is completed, the transmission of driving force between the drive mechanism of the intermediate material rotation unit 30 and the intermediate material 3 is released, and burrs are removed by a burr cutting device. In addition, gear block 38
It is necessary that the intermediate member 3 can be attached to and detached from the intermediate member 3 in a direction perpendicular to the axis. In the diagram shown in FIG. 4, the gear block 38 has three gears 38a, 38b, 3, which are provided with a radial slit 38d from the center to the outer periphery.
The intermediate material 3 is attached and removed by aligning the slit positions, and the gear 38b in the middle is turned to fix the intermediate material so that it does not fall out, and to form teeth continuously around the entire circumference. . With this device, not only the objects 1 and 2 on both sides but also the intermediate material 3 can be removed in a direction perpendicular to the rotation axis, so the members after friction welding can be removed by moving the device itself.

As described above, the friction welding machine of the present invention does not require rotating the object to be welded, and can be attached and detached by moving the device itself in a direction perpendicular to the rotation axis. It can be applied to curved members, and by making the device portable, friction welding can be applied to connect pipes to be welded to fixed pipe members such as large steel pipe structures or piping sites. Therefore, it can be expected to speed up welding work and improve joint performance.

For example, when connecting pipes for long-distance piping work, a work group is formed that combines a portable friction welding machine, a supporting truck, a crane, etc., and (a) preparations such as excavation of the piping site are carried out. (b) Transporting the welding machine unit and pipe (c) Installing the welding machine unit on the fixed pipe (d) Cutting the end face (e) Installing the intermediate material and joining pipe (f) Welding and burring (g) Welding machine By systematically and continuously removing the joint and moving it to the next joint position, work efficiency can be significantly improved.

Similarly, when applying friction welding to on-site piping work, the welding machine can be moved along the pipe itself or along a guide rail 52 laid along the pipe.
For example, as shown in FIG. 5, it is attached to a gate-shaped self-propelled cart 50 that straddles the pipe P, travels along the guide rail 52 to the welding point, and lowers the machine 51 at the welding point to embrace and grip the pipe P. and perform friction welding,
It is also suitable to raise the machine to remove it from the tube after welding is complete, and then move it to another welding position.
The holding means for the friction welding machine is not limited to a gate-type dolly; it is mounted on a self-propelled vehicle such as a forklift, and the machine is inserted from the side with the slit aligned with the height of the pipe to be welded from the ground. Various means are possible, such as gripping the tube.

As described above, according to the present invention, with a simple configuration,
Friction welding can now be applied to welding long or curved pipes, large steel pipe structures, and on-site piping, for which friction welding was difficult or impossible in the past, and has a remarkable effect on improving work efficiency and joint performance. is obtained.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a perspective view thereof, Fig. 3 is a perspective view showing details of the intermediate material rotation unit, and Fig. 4 is an example of a gear block attached to the intermediate material. FIG. 5 is a front view showing an example in which the welding machine of the present invention is made portable and mounted on a self-propelled vehicle. 1, 2... Work to be welded, 3... Intermediate material, 10, 2
0... Clamp unit, 11, 21, 31...
Slit, 12, 13...pressure means, 30...intermediate material rotation unit, 32, 38...gear (means for rotating the intermediate material), 35...motor (means for rotating the intermediate material), 52... guide rail.

Claims (1)

[Scope of Claims] 1. Two clamp units that coaxially grip two objects to be welded each having a rotary figure cross-sectional joint portion, a pressurizing means that draws the two clamp units toward each other in the axial direction, and the above-mentioned An intermediate member that is located between the two clamp units and has a cross section that matches the joint portion of the workpiece is held so as to be rotationally driveable coaxially with the joint portion of the workpiece.
and an intermediate material rotation unit that is movable in the axial direction between the two clamp units, the workpiece to be welded is attached to each of the above clamp units, the intermediate material is attached to the above intermediate material rotation unit, and only the intermediate material is rotated. A friction welding machine that simultaneously friction welds two joints by pulling the two clamp units using the pressure means while pressing the workpieces on both sides and both end surfaces of the intermediate material, the two clamp units and Each of the intermediate material rotation units is provided with a slit that reaches the center from one side surface and can relatively move the workpiece and the intermediate material in a direction perpendicular to the rotation axis, and the clamp unit is provided with a slit that reaches the center from one side surface and can move the workpiece and the intermediate material relative to each other in a direction perpendicular to the rotation axis. Means for gripping the workpiece inserted into the center is provided, and the intermediate material rotation unit is provided with means for rotating the intermediate material inserted into the center through the slit around its axis. A friction welding machine characterized by: 2. The friction welding machine according to claim 1, wherein the device is portable. 3. One of the objects to be welded is a pipe already fixed at the site, and the other is a pipe material to be connected to it, and the equipment moves along the pipe itself or a guide rail laid along the pipe. A friction welding machine according to claim 2, characterized in that: