JPH0244934Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in a cylindrical welding device for producing a cylindrical body such as a cylinder or a rectangular cylinder by butt-welding both ends of a plate-shaped workpiece.

(Prior Art) Traditionally, cylinders, such as cylinders and rectangular cylinders, have been manufactured by bending a plate-shaped metal workpiece into a cylinder shape, butting both ends of the workpiece together, and welding and joining the butted parts. Body welding equipment has been developed and is widely used.

That is, the cylindrical body welding device has a frame main body, a mandrel horizontally cantilever supported by the frame main body, and a plate-shaped workpiece wound around the mandrel. It is comprised of a clamping device equipped with a clamp that can press and fix the workpieces, and a welding device equipped with a movable welding torch that can join the abutting portions of the workpieces.

The cylindrical body welding device winds a plate-shaped workpiece around a mandrel, presses and fixes it to the outer circumferential surface of the mandrel with a clamp with both ends abutted, and sews the abutted portion with a welding torch. By welding, a cylindrical body can be produced.

However, in the cylindrical body welding device described above, the mandrel is cantilevered by the frame body so that the fabricated cylindrical body can be easily removed from the mandrel, so it may curve a little. In this case, when pressing and fixing the workpiece against the outer circumferential surface of the mandrel with both ends of the workpiece butted against each other, both ends of the workpiece do not come into close contact with the mandrel, and the workpiece cannot be pressed and fixed well and reliably, or the workpiece The ends may not match up exactly. As a result, the butt portions of the workpieces cannot be welded satisfactorily and accurately, and the quality of the welded portion of the cylinder and the cylinder itself is significantly degraded. In particular, the above problem becomes more noticeable when a long mandrel is used.

(Problems to be solved by the invention) The present invention was devised to solve the above problems, and its purpose is to provide a welding device for cylindrical bodies that can prevent the mandrel from bending when manufacturing the cylindrical body. It is on offer.

(Means for solving the problem) The cylindrical body welding device of the present invention has a frame body,
A mandrel supported cantilevered on the frame body,
A clamping device equipped with a clamp capable of pressing and fixing a plate-like workpiece wound around a mandrel to the outer circumferential surface of the mandrel with both ends abutted against each other, and a welding torch capable of joining both ends of the abutted workpiece are provided. In the cylindrical body welding device, the frame body has a lock position that can fixedly support the free end side of the mandrel supported by the support, and a lock position that allows the free end side of the mandrel to be freed and the mandrel can be welded. The mandrel is characterized in that it is provided with a support device that can take an unlocked position and an unlocked position in which a cylindrical workpiece fitted onto the mandrel can be pulled out from the mandrel in the axial direction.

(Function) When producing a cylindrical body using a cylindrical body welding device, first, the support device is placed in the lock position and the free end side of the mandrel is fixedly supported.

Next, a plate-shaped metal workpiece is wound around the mandrel, both ends of which are butted against each other on the outer peripheral surface of the mandrel, and both ends are pressed and fixed to the mandrel using clamps. At this time, the mandrel is supported at both ends, so curvature is prevented.
The workpiece can be press-fixed to the mandrel well and reliably, and both ends of the workpiece can be matched accurately.

After the workpiece is pressed and fixed to the mandrel, the butt portions of the workpiece are sewn and welded using a welding device.

Then, the press and fixation of the workpiece by the clamp is released, the support device is set to the unlocked position, the mandrel is placed in a cantilever supported state, and the cylindrical workpiece is pulled out from the mandrel.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 and 2 are a front view and a side view of a cylindrical welding device according to an embodiment of the present invention, which includes a frame body 1, a mandrel 2, a clamping device 3, a welding device 4, and a support. It is composed of a device 5 and the like.

The frame body 1 is formed in a U-shape from the front, and a hollow mandrel 2 in the center thereof is horizontally supported in a cantilevered manner. Note that a copper backing metal (not shown) is provided on the upper surface of the mandrel 2 along the axial direction. Further, a protrusion 2a is formed on the end surface of the mandrel 2 on the free end side.

The clamp device 3 is disposed on the frame body 1 above the mandrel 2, and presses and fixes the plate-shaped metal work 6 wound around the mandrel 2 to the backing metal of the mandrel 2 with both ends butted against each other. It is equipped with a copper clamp 3a that can be moved up and down.
In this embodiment, the clamp 3a is moved up and down by air.

The welding device 4 includes a running body 7 provided on the frame body 1 above the mandrel 2 so as to be movable along the axial direction of the mandrel 2 by an appropriate drive device;
It is composed of a TIG welding torch 10 and the like attached to the traveling body 7 via a holder 8 and a torch adjustment device 9. The TIG welding torch 10 is connected to a pulse built-in DC TID welding power source (not shown) and an inert gas supply device such as argon gas (not shown).

On the other hand, the support device 5 is provided on the frame body 1 at a position near the free end side of the mandrel 2, and has a lock position where the free end side of the mandrel 2 can be fixedly supported, and a lock position where the free end side of the mandrel 2 can be freely supported. It is configured such that it can take an unlocked position in which the cylindrical workpiece 6 fitted onto the mandrel 2 can be pulled out from the mandrel 2 in the axial direction.

That is, as shown in FIGS. 3 to 6, the support device 5 includes a flange body 11 attached to the frame body 1, a lever body 12 rotatably attached to the flange body 11, and a flange body 11. The lever body 12 is rotatably attached to the lever body 12, and an arm body 13 that interlocks with the lever body 12.

Specifically, the flange body 11 is fixed to the frame body 1 with bolts 14, and includes a pair of vertical walls 11a facing each other.

Further, the lever body 12 is provided with a gear 12a at its lower end, and the gear 12a is rotatably attached to the vertical wall 11a by a pin 15 while being located between the vertical walls 11a of the flange body 11.

Further, the arm body 13 has a lever body 1 at its upper end.
The mandrel 2 is provided with a gear 13a that meshes with the gear 12a of the mandrel 2, and a cap 13b that can fit into the protrusion 2a of the mandrel 2 at its lower end. This arm body 13 has a pin 1 attached to the vertical wall 11a in a state where the gear 13a thereof is positioned between the vertical walls 11a of the flange body 11 so as to mesh with the gear 12a of the lever body 12.
5, it is rotatably attached.

Thus, the support device 5 moves the lever body 12 from the lock position (see FIG. 4) where the cap 13b of the arm body 13 fits into the protrusion 2a of the mandrel 2 and fixedly supports the free end side of the mandrel 2. When the mandrel 2 is rotated in the direction of the arrow, the arm body 13 is rotated in the direction of the arrow, and the cap 13 comes out of the protrusion 2a of the mandrel 2. (See Figure 6). Further, when the lever body 12 is rotated from the unlocked position in the direction opposite to the direction of the arrow, the support device 5 becomes the locked position and fixedly supports the free end side of the mandrel 2.

In this embodiment, the support device 5 has an elongated hole 11b formed in the flange body 11 so that it can be moved vertically by a certain amount.

Next, a case will be described in which a cylinder is manufactured from a plate-shaped workpiece 6 using the cylinder welding apparatus.

First, place the support device 5 in the locked position (see Figure 4).
The free end side of the mandrel 2 is fixedly supported.

Next, a plate-shaped workpiece 6 made of metal (stainless steel, mild steel, aluminum, copper, etc.) is wound around the mandrel 2, and both ends of the workpiece 6 are butted on the outer peripheral surface of the mandrel 2 (at the position of the backing metal). Clamp 3a
It is pressed and fixed to the mandrel 2 by.

After the workpiece 6 is pressed and fixed to the mandrel 2, the TIG welding torch 10 of the welding device 4 is run along the abutting portion of the workpiece 6, and the abutting portion is sewn and welded.

Then, the workpiece 6 is released from the clamp 3a, the support device 5 is set to the unlocked position (see FIG. 6), the mandrel 2 is placed in a cantilevered state, and the cylindrical workpiece 6 is lifted from the mandrel 2. Pull it out in the direction of the arrow shown in Figure 6.

In the above embodiment, the support device 5 was composed of the flange body 11, the lever body 12, and the arm body 13, but the present invention is not limited to the above embodiment. A lock position where the free end side can be fixedly supported, and an unlocked position where the free end side of the mandrel 2 can be freed and the cylindrical workpiece 6 fitted onto the mandrel 2 can be pulled out from the mandrel 2 in the axial direction. The configuration is arbitrary as long as it can be used.

(Effects of the invention) As described above, the cylindrical body welding device of the present invention has two positions: a locked position where the free end side of the cantilevered mandrel can be fixedly supported, and an unlocked position where the free end side of the mandrel is freed. Since a support device is provided that can take the shape of the mandrel, both ends of the mandrel are supported during production of the cylinder, and curvature of the mandrel is prevented. As a result, both ends of the workpiece can be brought into close contact with the outer circumferential surface of the mandrel in a state where they are abutted against each other, and the workpiece can be pressed and fixed well and reliably, and both ends of the workpiece can also be accurately butted against each other. As a result, the butt portions of the workpieces can be welded satisfactorily and accurately, and the quality of the welded portion and the cylindrical body itself can be improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of a cylindrical welding device according to an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a side view of a support device portion of the cylindrical welding device, and Fig. 4 is the same. 5 is a sectional view taken along the line -- in FIG. 3, and FIG. 6 is a longitudinal sectional view similar to FIG. 4 showing an operating state. 1 is the frame body, 2 is the mandrel,
3 is a clamp device, 3a is a clamp, 4 is a welding device, 5 is a support device, 6 is a workpiece, and 10 is a TIG welding torch.

Claims (1)

[Scope of utility model registration request] A frame body 1, a mandrel 2 cantilevered on the frame body 1, and a clamp 3 that can be press-fixed to the outer peripheral surface of the mandrel 2 with both ends of the plate-shaped workpiece 6 wound around the mandrel 2 butted against each other.
In the cylindrical body welding device, which comprises a clamping device 3 equipped with A lock position where the free end side of the mandrel 2 that is held and supported can be fixedly supported, and a cylindrical workpiece 6 fitted on the outside of the mandrel 2 is moved from the mandrel 2 in the axial direction with the free end side of the mandrel 2 free. A welding device for a cylindrical body, characterized in that it is provided with a support device 5 that can be taken to an unlocked position where it can be pulled out.