JPS624394Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This idea corrects discrepancies that occur in the grooves of unwelded pipes during the manufacturing process of so-called welded pipes, in which a plate-shaped material is made into an unwelded pipe with a predetermined cross-sectional shape, and then the butted groove parts are welded. This invention relates to a groove correction device for unwelded pipes that enables improvement in processing accuracy during temporary spot welding performed as a pre-welding process. Welded pipes manufactured from plate-shaped materials include a welded pipe A with a circular cross-section, a portion of which is shown in a perspective view in Fig. 1;
There are various types of welded pipes A', a part of which is shown as an example in FIG. For this type of welded pipe A or A', for example, in the case of a circular welded pipe A, an unwelded pipe 1 shown in a front view in FIG. 3 is manufactured.
Grooves 1A and 1B as shown in the enlarged front view in the figure
If there is any discrepancy, correct it to ensure an accurate butt, then temporarily fix it with spot welding, and then
Main welding is done by TIG welding etc. By the way, the groove portions 1A and 1B that require correction
The misalignment is usually caused by one or both of the grooves 1A and 1B being positioned outward from the normal abutment position, and is often caused by elastic deformation of the plate-like material. Therefore, this occurs in most of the unwelded pipes 1. The most common conventional groove correction device B for correcting the misalignment between the grooves 1A and 1B is shown in a front view in FIG. The groove straightening device B has a highly rigid annular body 2 that is free from deformation, and a plurality of bolts 3 screwed into equal angular division positions in the circumferential direction of the annular body 2. Since this device corrects the grooves 1A and 1B into an accurate butting state by tightening the bolt 3 while keeping the welded pipe 1 perfectly round, tightening the bolt 3 is very troublesome and requires a skilled skill. Not only that, but it also had the disadvantages of requiring long hours of work and being extremely inefficient. Another groove correction device is a groove correction device C shown in a partially cutaway front view in FIG. The groove straightening device C is a vise-like pressurizing device, and one wall portion 4 of the opposing wall portions 4 and 5 is
, an inward pressure receiving part 6 is formed, and a screw hole 7 is provided in the other wall part 5 at a position directly facing the planar pressure receiving surface 6a of this pressure receiving part 6, and this screw hole is inserted into at least the pressure receiving part 6. The screw hole 7 has an inner diameter corresponding to the thickness of
The unwelded pipe 1 is held between the pressure receiving surface 6a of the pressure receiving part 6 and the unwelded pipe 1 is straightened. If the groove straightening device C does not properly select the pressurizing position of the unwelded pipe 1 depending on the amount of misalignment between the grooves 1A and 1B, it will deform and become non-circular. There were some drawbacks, such as the risk of danger and the narrow opening making it unsuitable for large-diameter pipes. This invention provides a groove straightening device for unwelded pipes that solves the above-mentioned difficulties based on the above-mentioned viewpoints, and allows the unwelded pipes to be freely inserted in the axial direction on the left and right sides of the pipe passage formed in the fixed frame. , which incorporates a pair of blocks capable of centripetally holding an unwelded pipe, one of the blocks being a pressure-receiving block whose position can be freely adjusted in the left and right directions, and the other being,
The pressurizing block is capable of freely moving pressure toward the pressure receiving block, and is characterized in that a pair of left and right bevel correction claws are provided at the upper left and right center positions of the pipe passage section so as to be freely movable up and down. be. Next, the groove correction device of this invention will be explained by way of an example with reference to the drawings. FIG. 7 shows a front view of an embodiment of the groove correction device of this invention, and FIG. 8 shows a longitudinal side view. As shown in the drawings, the groove correction device D of this invention is provided with a window hole 10 as a tube passage section at the center of the front of the fixed frame 9. A pair of horizontal V-shaped blocks 1 are placed on the left and right sides of the window hole 10.
1 and 12 are included. Both blocks 11 and 12 are blocks that centripetally clamp the unwelded pipe 1 having a circular cross-section, and one block 11 has a position adjusting screw 1 attached to the frame 9.
This is a pressure receiving block that is fixed at that position after the position is adjusted by the operation in step 3, and the other block 12 is
The rod 14A of the hydraulic cylinder 14 attached to the frame 9 is connected to the back side, and the hydraulic cylinder 1
This is a pressurizing block that reciprocates with the operation of step 4. Both of the blocks 11 and 12 have upper and lower inner halves formed with inclined surfaces 11a, 11b, 12a, and 12b, respectively, which allow free contact with the unwelded pipe 1. Therefore, the unwelded pipe 1 is supported at four locations, top, bottom, left and right, and is centripetally clamped. A relief valve (not shown) is provided in the hydraulic circuit of the hydraulic cylinder 14 that reciprocates the block 12 to release hydraulic pressure exceeding a predetermined value. When holding the unwelded pipe 1 between the
Even if the pipe diameters are different, if the grooves 1A and 1B come into contact, it is possible to control the pipes so that no further pressure is applied. On the other hand, in any case, the position of the block 11 determined by the pipe diameter of the unwelded pipe 1 is such that the axis of the unwelded pipe 1 held between the blocks 11 and 12 is at the left-right center position of the window hole 10. In this example, the screw rod 1
Rotating the handle 15 fixed to the outer end of 3;
Although this is done by operating the locking nut 16 that abuts against the back surface of the block 11, other means such as rack, pinion, hydraulic, etc. may also be used. In FIG. 7, a solid line shows the state in which the blocks 11 and 12 sandwich the unwelded pipe 1 of the largest diameter that can be processed in this embodiment, and the unwelded pipe 1 of the smallest diameter also is shown.
Blocks 11 and 12 for clamping are shown with imaginary lines, but a plurality of blocks that differ in stages are prepared in advance and can be replaced each time the diameter of the unwelded pipe 1 to be processed differs. shall be carried out. FIG. 9 shows an example of the blocks 11 and 12 for unwelded pipes with the largest diameter, and FIG. 10 shows an example of the blocks for the smallest diameter in front view. On the other hand, rollers 17, 17 which can freely roll freely are horizontally supported in front and behind the window hole 10, respectively. Both rollers 17, 17 support the lower end of the unwelded pipe 1, and are vertically adjustable in position.
The position can be adjusted, for example, by moving and fixing bearing boxes (not shown) at both ends to arbitrary positions. The groove straightening device D of this invention has the above-mentioned block 1.
Bevel part 1 of unwelded pipe 1 held by 1 and 12
A pair of left and right groove correction claws 18 and 19 are provided in parallel with each other with their tips facing downward at the upper left and right center portions of the window hole 10 so as to face directly above the windows A and 1B. The groove correction claws 18 and 19 are both moved up and down by hydraulic cylinders 20 and 21 fixed at the top of the fixed frame 9, and the grooves 1A and 1
Pressure is brought into contact with either or both of the grooves 1A and 1B to correct the misalignment between the two grooves 1A and 1B separately. The hydraulic circuit of the hydraulic cylinders 20 and 21 allows the rods 20A and 21A to reciprocate in short strokes.
Regardless of the diameter of the unwelded pipe 1,
The lower limits of the groove correction claws 18 and 19 are kept constant. Note that control may be performed in which the properties of the grooves 1A and 1B are detected and an operation signal is sent to the hydraulic cylinders 20 and 21. The groove straightening device D of this invention having the above-mentioned configuration allows an unwelded pipe 1 of a predetermined diameter to be opened through a window hole 10 which is opened by retracting the block 12.
When the hydraulic cylinder 14 is activated to move the block 12 forward, the block 12 comes into contact with the right side of the unwelded pipe 1 whose left side is in contact with the block 11 whose position has been adjusted in advance, and the unwelded pipe 1 is brought into contact with the right side of the unwelded pipe 1. The tube 1 is held centripetally. In this case, groove portions 1A, 1B
so that it faces directly below the groove correction claws 18 and 19.
It is necessary to insert the unwelded pipe 1 into the window hole 10 with the grooves 1A and 1B facing upward. Since the straightening is carried out locally on the long unwelded pipe 1, the unwelded pipe 1 is advanced intermittently, and when it is at the stop position after advancing by a predetermined pitch, the centripetal clamping by the blocks 11 and 12 is performed. Then, by lowering the groove portion correction claws 18 and 19, one or both of the groove portions 1A and 1B protruding outward is corrected. When the unwelded pipe is an irregularly shaped pipe, for example, if the cross-sectional shape is square, the correction is performed using blocks 11' and 12' shown in a front view in FIG. Furthermore, when we used the groove straightening device of this invention to straighten the grooves on the following six types of unwelded pipes, we were able to straighten the grooves extremely easily and reliably. Ta.

【table】

[Table] As is clear from the above description, the groove straightening device of this invention has a fixed pressure-receiving block whose position is adjusted in advance, and a hydraulically driven movable pressurizing block. With the unwelded pipe centripetally held, the groove can be straightened with high efficiency and accuracy using the hydraulically driven groove straightening claws, which has the excellent advantage of greatly improving the productivity of welded pipe manufacturing. It is something.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views showing a portion of each example of a welded pipe, Figure 3 is a front view showing an example of an unwelded pipe, and Figure 4 is an enlarged front view showing an example of the gap in the groove. Fig. 5 is a front view showing an example of a conventional groove correction device, Fig. 6 is a partially cutaway front view showing another example of a conventional groove correction device, and Fig. 7 is a front view of the conventional groove correction device. FIG. 8 is a front view showing an embodiment of the groove correction device.
The figure is a longitudinal side view, FIGS. 9 and 10 are front views showing each set of blocks, and FIG. 11 is a front view showing a set of blocks for pipes of different diameters. In the drawings, D...Gave straightening device of this invention, 1...Unwelded pipe, 1A, 1B...Bevel, 9...Fixed frame, 10...Window hole as pipe passage, 11, 12,
11', 12'...Block, 13...Screw rod, 14
... Hydraulic cylinder, 17 ... Roller, 18, 19
...Bevel correction claw, 20, 21...Hydraulic cylinder.

Claims (1)

[Scope of utility model registration request] A pair of blocks that can freely hold the unwelded pipe centripetally are installed on the left and right sides of the pipe passage part formed in the fixed frame so that the unwelded pipe can be freely inserted in the axial direction. The pressure receiving block is capable of freely adjusting its position in the direction, and the other is a pressurizing block capable of freely moving pressure toward the pressure receiving block.A pair of left and right openings are provided at the upper left and right center positions of the pipe passage section. A bevel correction device for unwelded pipes with a tip correction claw that can be moved up and down.