JP2000263128A - Internal surface bead cutting tool for welded tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal surface bead cut tool which is capable of cutting the internal surface bead with a specified cut, and excellent in workability. SOLUTION: Guide rollers 20a, 20b, upstream side guide rolls 30a, 30b, and downstream side guide rolls 40a, 40b in contact with an inner circumferential surface of a welded pipe P with substantially equally-spaced interval in the circumferential direction are rotatably provided on a long rod 10. The guide rollers 20a, 20b are provided with the distance W therebetween to allow an internal bead B to pass sufficiently, and can be adjusted positionally with respect to the internal surface of the welded pipe P by a height adjustment screw 23. The upstream side guide rolls 30a, 30b and the downstream side guide rolls 40a, 40b are rotatably accommodated in a hole 12 inclined in different directions, respectively. A cutting tool fitting block 50 equipped with a ring-type cutting tool 60 is connected to the downstream side end portion of the long rod 10 in a height adjustable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner bead cutting tool used for smoothing the inner surface of a welded pipe.

[0002]

2. Description of the Related Art Welded pipes are manufactured by bending a metal band in the width direction to form an open pipe and welding both ends in the width direction. For example, in high-frequency welding, an open pipe is inserted through a high-frequency ring to heat both ends in the width direction, and then both ends in the width direction are fused by upset. As a result, the inner surface bead and the inner surface bead raised from the inner surface of the tube and the outer surface bead are formed in the welded portion. T
Also in IG, MIG, laser welding, etc., an inner bead and an outer bead are formed to some extent. If there is an inner bead and an outer bead, the inner and outer surfaces of the welded pipe are not smooth, so that not only the appearance is poor, but also a problem occurs when performing bending, pipe expansion, etc. in a later step. Therefore, a pipe forming line that incorporates a bead cutting step following the welding step and smoothes the surface and the inner surface of the welded pipe is employed. The outer bead is relatively easily cut using a cutting tool located near the weld of the weld tube. For cutting the inner surface bead, for example, as shown in FIG.
The bead cutting tool 1 inserted from the upstream side of the line into the inside of the welded pipe P running along is used.

[0003] A bead cutting tool 1 has a long rod 2 inserted into a welding pipe P. A pair of grooved rollers 3, 3 are provided rotatably on the upper peripheral surface of the long rod 2, and a ring-type cutting tool 4 is provided at a downstream end along the line direction D. The grooved roller 3 is shown in FIG.
As shown in (b), a groove through which the inner bead B passes is formed in the center of the roll peripheral surface. Ring type tool 4
A predetermined positional relationship with respect to the inner surface of the welded pipe P is secured by the height adjusting mechanism 5 and fixed by the holding bolt 6. On the opposite side (the lower side in FIG. 1) of the grooved roller 3 and the ring-type cutting tool 4, a swing link 7 is pivotally attached to the long rod 2, and a lower roll 8 is rotatable at the tip of the swing link 7. Is provided. The bead cutting tool 1 is supported at three points on the inner surface of the welding pipe P by the grooved rollers 3 and 3 and the lower roller 8, so that the positional relationship of the ring-type cutting tool 4 with respect to the inner surface bead B is ensured. In this state, the inner bead B is cut by the ring-type cutting tool 4 to smooth the inner surface of the welded pipe P.

[0004]

When the welded pipe P is manufactured by welding both ends in the width direction of the open pipe-shaped metal strip, spatter is generated on the inner and outer surfaces of the welded pipe P. The outer spatter is easily separated from the weld pipe P, but the inner spatter accumulates inside the weld pipe P. When the grooved roller 3 rolling inside the welding pipe P runs on the inner bead B or spatter, or when the lower roller 8 runs on spatter, the long rod 2 is displaced with respect to the pipe axis of the welding pipe P. , The cutting amount of the ring-type cutting tool 4 is varied. As a result, the cut amount of the inner surface bead B changes irregularly, and there is a possibility that the base material of the welded pipe P may be cut. Further, since the grooved roller 3 and the lower roller 8 are provided above and below the long rod 2, the long rod 2 is easily displaced in the left-right direction. When the long rod 2 is displaced, the grooved roller 3 rides on the inner bead B and the ring-type cutting tool 4 is separated from the inner bead B, resulting in insufficient cutting. The displacement of the long rod 2 also occurs due to the rolling of the welding pipe P. Further, a height adjusting mechanism 5 having a slide-type cutting tool mounting block 5
In this case, since the holding bolt 6 is interposed, the distance from the slide portion to the bite cutting position is long, and the moment load is large. Therefore, the structure is low in strength and easy to cause backlash. In addition, the work of replacing the ring-type cutting tool 4 when worn becomes troublesome.

[0005]

SUMMARY OF THE INVENTION The present invention has been devised to solve such a problem, and has guide rollers arranged so as to be in contact with the inner surface of a weld pipe at substantially equal intervals in the circumferential direction. At the same time, by adopting the method of fixing the ring-type cutting tool from the downstream end of the long rod, the positional relationship between the inner surface bead and the ring-type cutting tool is secured accurately, stabilizing the bead cutting amount, and An object of the present invention is to provide a bead cutting tool which can easily replace a ring-type cutting tool and has excellent strength.

In order to achieve the above object, the present invention provides an internal bead cutting tool for a welded pipe, comprising: a long rod inserted from above a welding position into a welded pipe being manufactured; and an upstream end provided above the long rod. Part, a pair of guide rollers provided rotatably on both sides on the downstream side of the lever at an interval across the inner bead of the welding pipe, and a leg part provided in the middle part of the lever, the leg part of the long rod A height adjusting screw that abuts on the peripheral surface, and a pair of upstream guide rolls rotatably provided in oblique holes formed in the lower part of the long rod at positions upstream of the guide rollers and inclined in different directions from each other. And a pair of downstream guide rolls rotatably provided in oblique holes formed in the lower part of the long rod at different positions on the downstream side of the guide rollers and inclined in different directions, and a downstream end of the long rod Height adjustable A tie tool block attached, a ring-type tool mounted in the tool mounting hole of the tool mounting block, and a holding bolt screwed into the upstream side of the tool mounting hole to hold the head of the ring tool with an inverted conical head A biting tongue extending from the downstream side of the bite mounting block to hold the head of the ring type bite.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bead cutting tool according to the present invention includes a long rod 10 inserted from the upstream side of a line into a welding pipe P running along a line direction D as shown in FIG. It is the same as the bead cutting tool 1 in FIG. At the upstream end of the long rod 10, a mounting portion 11 projects in the longitudinal direction of the rod. Long rod 1
Reference numeral 0 is fixed to a support arm (not shown) disposed outside the welded pipe P via a mounting hole 12 formed in the mounting portion 11. An inner bead B is provided on the upper peripheral surface of the long rod 10.
A lever 21 is provided to rotatably mount a pair of guide rollers 20a and 20b straddling the guide rollers 20a and 20b. Guide roller 20
Since a and 20b are provided on both sides of the lever 21, the mutual distance W (FIG. 2b) is larger than that of the grooved roller 3.
Can be taken wide enough. Therefore, the inner bead B passes between the guide rollers 20a and 20b with a margin, and the guide rollers 20a and 20b are reliably prevented from riding on the inner bead B.

As shown in FIG. 3, the lever 21 is attached to the long rod 10 with a pivot pin 22 near the upstream end. A height adjusting screw 23 is screwed into the center of the lever 21, and a stopper screw 24 is screwed into the downstream end. The length of the long rod 10 is adjusted by adjusting the screwing amount of the height adjusting screw 23.
By changing the length of the leg of the height adjusting screw 23 that comes into contact with the peripheral surface of the welding pipe P, the guide rollers 20a and 20b can be brought into contact with the inner surface of the welded pipe P having various sizes under the same conditions. The stopper screw 24 regulates the position of the guide rollers 20a, 20b so as not to be too far from the inner surface of the welded pipe P. On the lower side of the long rod 10, a pair of upstream guide rolls 30a and 30b and a downstream guide roll 40, each having a pair of axes arranged obliquely in different directions.
a and 40b are provided. Upstream guide roll 30
2b is inserted into the oblique hole 12 formed in the shaft of the long rod 10 as shown in FIG. 2B, and is rotatably attached to the long rod 10 by the shaft 31b. The other upstream guide roll 30a is rotatably inserted into a diagonal hole (not shown) inclined in the opposite direction to the diagonal hole 12.

The contact point at which the upstream guide rolls 30a and 30b contact the inner surface of the welded pipe P is the guide roller 20.
It is preferable that a and 20b are arranged at equal intervals along the inner peripheral surface of the welded pipe P together with the contact points where the a and 20b contact the inner surface of the welded pipe P. The downstream side guide rolls 40a and 40b are also assembled on the downstream side of the long rod 10 in a similar positional relationship. Thus, the guide rollers 20a and 20b, the upstream guide rolls 30a and 30b, and the downstream guide roll 40
When making contact with the inner peripheral surface of the welded pipe P at a and 40b, not only the vertical but also horizontal blur is regulated, and the long rod 10 is secured at a predetermined position inside the welded pipe P. At the downstream end of the long rod 10, a cutting tool mounting block 50 is provided. The bite mounting block 50 has a dovetail-shaped projection 51 protruding upstream. A fitting hole (not shown) having a shape corresponding to the dovetail-shaped projection 51 is formed at the downstream end of the long rod 10. By fitting the dovetail-shaped protrusion 51 into the fitting hole, the cutting tool mounting block 50 is firmly connected to the long rod 10. The insertion amount of the dovetail-shaped projection 51 into the fitting hole is adjusted by a height adjusting screw 52.

The tool mounting block 50 has a leg 6 of a ring tool 60 having a frusto-conical head 61 at the top.
2 is formed with a bite mounting hole 53 into which is fitted.
The tool holding tongue piece 54 faces the tool mounting hole 53 from the downstream side of the tool mounting block 50. The biting tongue piece 54 is separated from the block main body via the cut 55. A screw hole 57 into which the holding bolt 56 is screwed is formed on the upstream side of the bite mounting hole 53. The holding bolt 56 has an inverted conical head that comes into contact with the inclined surface of the ring-type cutting tool 60. Ring tool 6
0 is inserted into the bite mounting hole 53, the holding bolt 56 is screwed into the screw hole 57, and then the biting tongue piece 54 is urged toward the block main body with the tightening bolt 58. It is held down by the conical head and the biting tongue piece 54. Since the cutting tool holding tongue piece 54 for holding the ring-type cutting tool 60 from the downstream side is provided in this manner, the cutting part 6 is cut from the connecting part (the dovetail-shaped projection 51).
The distance L to 3 is the bead cutting tool 1 described in FIG.
Is significantly shorter than. Therefore, the moment load applied to the ring-type cutting tool 60 is reduced, and a structure excellent in strength is obtained.

[0011] The inner bead cutting tool described above is
The long rod 10 is fixed to a support arm (not shown) arranged on the upstream side of the welding position of the pipe making line, and the ring-type cutting tool 60 is positioned inside the welded pipe P behind the welding position. Placed in At this time, the upstream guide rolls 30a and 30b and the downstream guide rolls 40a and 40 each having a size corresponding to the inner diameter of the welding pipe P to be manufactured.
Select b. The height of the guide rollers 20a and 20b is adjusted by the height adjusting screw 23 so that the guide rollers 20a and 20b are in contact with the inner surface of the welded pipe P at a position where the guide rollers 20a and 20b straddle the inner surface bead B. By adjusting the amount, the cut amount of the inner bead B by the ring-type cutting tool 60 is set to a target value. In this state, the inner bead B of the welding pipe P sent from the welding position is cut by the ring-type cutting tool 60. The bead debris S, together with the welded pipe P, extends in the line direction D
To the downstream side of At this time, the guide rollers 20a, 2
0b, the upstream guide rolls 30a, 30b and the downstream guide rolls 40a, 40b are in contact with the inner peripheral surface of the welded pipe P at substantially equal intervals, so that the long rod 10 is restrained from moving vertically and horizontally. It is secured at a predetermined position in the welded pipe P.

Further, the guide rollers 20a, 20b do not ride on the inner bead B because of the distance W between the guide rollers 20a, 20b. Upstream guide rolls 30a, 30b and downstream guide rolls 40a, 40
b also contacts the inner surface of the welded pipe P at a position slightly away from the lower part of the welded pipe P in which spatter tends to accumulate, so that the upstream side guide roll 30a, 30b and downstream guide roll 40
The opportunity for a and 40b to ride is reduced. for that reason,
There is no vibration caused by contact with the inner bead B or spatter, the ring-type cutting tool 60 is secured in a predetermined positional relationship with respect to the inner bead B, and the inner bead B is fixed at a constant cutting amount.
Is cut.

When the thickness of the welded pipe P being manufactured is changed in the middle, a long hole is opened in the upper surface of the welded pipe P with a plasma cutter, and the height adjusting screw 23 is adjusted from above to guide the guide rollers 20a, 20b is brought into contact with the inner surface of the welded pipe P after the wall thickness is changed, and the amount of screwing of the height adjusting screw 52 is adjusted to set the amount of cut of the inner surface bead B by the ring-type cutting tool 60 again. That is, the conventional bead cutting tool 1
Since it is not necessary to remove the pipe from the pipe production line and readjust it outside the line as shown in FIG. 1, the pipe production line after the wall thickness change can be started in a short time. Even when the worn ring-type cutting tool 60 is replaced, the ring-type cutting tool 60 is removed from the cutting tool mounting block 50 by loosening the tightening bolt 58 and the holding bolt 56 of the cutting tool tongue piece 54 from the hole formed in the upper portion of the welding pipe P. Therefore, the replacement work of the ring-type cutting tool 60 is also facilitated.

[0014]

As described above, since the inner bead cutting tool for a welded pipe according to the present invention is provided with the guide rollers and the guide rolls which contact the inner surface of the welded pipe at substantially equal intervals in the circumferential direction, the welding is performed. The long rod does not move in the vertical and horizontal directions with respect to the pipe axis of the pipe, and a gap is provided between the pair of guide rollers so that the inner surface bead can pass with a margin, and the guide roll contacts the inner surface of the welded pipe. Since the position is slightly away from the lower part of the inner surface to the left and right, vibration caused by climbing on the inner surface bead or spatter is not applied to the long rod. Therefore, the ring-type cutting tool is secured in a predetermined positional relationship with respect to the inner bead of the welded pipe, and the inner bead is cut at a constant cutting depth.
In addition, since the height of the guide roller and the ring-type tool can be adjusted only by operating from above, resetting when changing the wall thickness of the welded pipe and replacing worn ring-type tools are easy and quick. Productivity also increases. In addition, since the distance from the position at which the cutting tool mounting block with the ring-type cutting tool is connected to the long rod to the cutting position can be shortened, a structurally strong internal bead cutting tool can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a conventional inner bead cutting tool (a).
And cross-sectional view as viewed in the pipe axis direction (b)

FIG. 2 is a perspective view of an inner bead cutting tool according to the present invention, and FIG.

FIG. 3 is a plan view (a) and a side view (b) of an internal bead cutting tool according to the present invention.

FIG. 4 is a perspective view on the downstream side of a long rod to which a cutting tool mounting block is connected (a) and a partial cross-sectional view of a cutting tool mounting block on which a ring-type cutting tool is mounted (b).

[Explanation of symbols]

10: Long rod 20a, 20b: Guide roller
21: Lever 23: Height adjustment screw 30a, 30
b: upstream guide roll 40a, 40b: downstream guide roll 50: cutting tool mounting block 52:
Height adjustment screw 53: Tool holder hole 54: Tool holder tongue 5
6: Holding bolt 60: Ring type tool 63: Cutting part P: Welded pipe B: Inner bead W: Guide roller 20
Distance between a and 20b L: Distance from the connecting part of cutting tool block to cutting part S: Bead debris

Claims (1)

[Claims] 1. A long rod inserted from above a welding position into a welding pipe being manufactured, a lever having an upstream end attached to an upper portion of the long rod, and welding pipes provided on both sides on the downstream side of the lever. A pair of guide rollers provided rotatably at intervals over the inner bead, a height adjustment screw provided at the intermediate part of the lever, and a leg portion abutting on the peripheral surface of the long rod, and upstream of the guide roller A pair of upstream guide rolls rotatably provided in oblique holes formed in the lower part of the long rod in different directions at the side position, and at the lower part of the long rod at the downstream position of the guide roller. A pair of downstream guide rolls rotatably provided in oblique holes formed to be inclined in different directions, a bite mounting block connected to the downstream end of the long rod so as to be adjustable in height, and a bite mounting Block tooling A ring-type tool attached to the hole, a holding bolt that is screwed into the upstream side of the tool-mounting hole and holds the head of the ring-type tool with an inverted conical head, and a ring-type tool that extends from the downstream side of the tool mounting block. Internal bead cutting tool for welded pipes, comprising a biting tongue piece for holding the head.