JPH10193284A - Inner surface bead cutting and subdividing device for electro resistance welded tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut and subdivide an inner surface bead of an electro resistance welded tube surely and safely, and without deteriorating a quality of inner surface nature so as to remove, and make usable in common for a pipe diametric size of a fixed range. SOLUTION: On a mandrel 2 provided with a tool 5, so as to make contact with a pipe inner wall, an upper/lower support roller 3 is provided, the mandrel 2 is supported in an electro resistance welded tube A, and a cutter hydraulic cylinder 10 is provided, a moving blade block 9 associated with a drive shaft 12 comes into contact with a fixed blade block 9 provided in a position for an inner surface bead cutting chip to pass through, so as to slide, a cutting chip cutter 7 is constituted. In place of the lower part support roller, a tension roller 23 is provided, which is associated with a drive shaft 21 of an arm hydraulic cylinder 20 provided on the inner surface mandrel 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for removing an internal beat from a cylindrical electric resistance welded steel pipe, and more particularly, to a method for cutting an internal bead into a mandrel having an internal beat cutting mechanism installed in the electric resistance welded pipe. An internal beat cutting and shredding device provided with a mechanism for shredding cutting chips generated later, and a mechanism capable of coping with a certain range of pipe diameters by automatically adjusting a support position of a mandrel in an ERW pipe. The present invention relates to an internal beat cutting and shredding device provided with:

[0002]

2. Description of the Related Art Conventionally, in the process of manufacturing a hot ERW pipe, an outer bead and an inner bead are usually cut with a cutting tool immediately after ERW welding. The outer bead is removed in the form of a coil using a device such as a winder, while the inner bead is equipped with a cutting mechanism provided with a fixed cutting tool in an ERW pipe conveyed in the manufacturing process immediately after ERW welding. And cut. At this time, the cutting chips of the inner bead remain in the electric resistance welded tube in a substantially linear continuous form. Usually, the ERW pipe is cut to a certain length by a cutting machine such as a cutoff after the cutting process of the inner bead and the outer bead. After this cutting treatment, the residual inner surface bead was cut by a manual cutting machine such as a clipper and then discharged by high-pressure water or the like.

As an alternative to the internal bead cutting and removing operation by the manual cutting machine described above, an internal bead cutting mechanism is installed in an electric resistance welded pipe, and a roller rotatably provided on the cutting mechanism is transported in the manufacturing process. A method of rotating a pair of rotating tools by contacting the inner wall of the ERW pipe, rotating the pair of rotating tools, and cutting the continuous inner bead between the rotating tools through a continuous inner bead; There is known a method in which a gas spray burner is provided on a bead cutting mechanism to melt and cut an inner bead after cutting (see, for example, Japanese Patent Publication No. 60-161111 and Japanese Patent Publication No. 4-3).
No. 00115).

The above-described inner bead cutting mechanism that operates in the manufacturing process is provided with a plurality of support rollers arranged on a circumference, and the rollers are conveyed by bringing the rollers into contact with the inner wall of the tube. In the ERW pipe, the cutting mechanism is supported at the installation position, and plays a role of maintaining the set cutting condition of the inner bead of the cutting tool.

[0005]

Among the methods described in the prior art, in the method of cutting the inner bead after cutting by a manual cutting machine, the work during the automatic transfer of the ERW pipe in the ERW pipe manufacturing process is not described. Therefore, a reliable cutting process is required in a short time, and furthermore, since the operation is dependent on humans, a high level of skill and labor is required, and the operation is very dangerous.

Further, in the shredding method using a rotating tool, there is a technical problem that the cut inner bead passes accurately between the rotating tools, a problem that it is difficult to confirm the state from the outside, and a problem that There was a problem related to the shredding performance, that is, the certainty of shredding.

[0007] In the method of fusing and shredding by a gas spray burner, there is a problem that the fine molten steel pieces generated at the time of fusing cause deterioration of the properties of the inner surface of the ERW pipe, and oxygen gas or propane gas supplied to the burner. There is a problem in terms of safety due to piping such as in an electric resistance welded pipe exposed to high temperatures.

Further, in a cutting mechanism supported by a plurality of support rollers fixed at a fixed position in an electric resistance welded pipe, there is a problem that devices corresponding to the respective pipe diameter sizes to be cut must be prepared and installed. there were.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide an internal bead cutting device provided with a hydraulically actuated drive mechanism in the internal bead cutting device. To provide an internal bead removal device that safely and securely shreds the bead, and further provides a mechanism for maintaining a constant relative position between the internal bead cutting tool and the internal bead to be cut, thereby providing an electric resistance welded tube. One type of inner bead remover can cope with a certain range of pipe diameters, and in the manufacturing process, there is a need to eliminate the work of changing to an inner bead remover capable of coping with each pipe diameter and re-installing it.

[0010]

In order to achieve the above object, an internal bead cutting and shredding apparatus according to the present invention is provided on a mandrel provided with a cutting tool for internal bead cutting, in contact with an inner wall of an electric resistance welded pipe, and An upper support roller and a lower support roller are attached so as to be rotatable in the pipe axis direction, and the mandrel is supported in the electric resistance welded pipe by the upper support roller and the lower support roller, and provided on the mandrel. The movable blade block interlocking with the drive shaft of the cutter hydraulic cylinder that operates in the pipe axis direction slides in contact with the fixed blade block fixed on the mandrel provided at the position where the internal bead cutting chips pass. I do.

Further, the inner bead cutting and shredding device is provided with an inner bead on a mandrel so as to be in contact with the inner wall of the ERW pipe so as to be able to cope with a certain range of ERW pipes having different diameters. One upper support roller on the side and the other tension roller on the opposite inner bead side are attached so as to be rotatable in the tube axis direction, and are supported in the electric resistance welded tube, and operate in the direction crossing the tube axis. The drive shaft of the arm hydraulic cylinder and the tension roller may be configured to work together.

[0012]

[Function] When the inner bead cutting and shredding device is mounted in the ERW pipe and the ERW pipe is transported in the pipe axis direction, the upper support roller and the lower support roller support the mandrel in a fixed position in the ERW pipe, While rolling the inner wall of the ERW pipe in the transport direction of the ERW pipe while maintaining the cutting conditions of the inner bead with the cutting tool,
The inner bead in the ERW pipe is cut by a cutting tool provided on the inner bead cutting and shredding device. The cut continuous-shaped cutting chips pass between the fixed blade block and the movable blade block at a speed substantially equal to the transport speed of the ERW pipe in a direction intersecting their sliding surfaces. At this time, the cutting chips are cut and shredded between a movable blade block that reciprocates in conjunction with a drive shaft of a cutter hydraulic cylinder and a fixed blade block fixed on a mandrel. It falls to the bottom of the pipe and remains.

The tension roller interlocking with the drive shaft of the cutter hydraulic cylinder rolls on the pipe wall in the transport direction of the electric resistance welded pipe together with the upper support roller, and can also move in the pipe diameter direction. Since such a tension roller follows a change in the pipe diameter, the relative position between the inner bead and the cutting tool on the mandrel is maintained even if the pipe diameter changes, and the cutting conditions of the inner bead do not change. The pressing force on the tube wall acting on the upper support roller and the tension roller is
Although the control can be performed by the hydraulic pressure supplied to the arm hydraulic cylinder, the control can be performed by increasing or decreasing the number of provided arm hydraulic cylinders.

[0014]

An embodiment will be described with reference to the drawings. In FIG. 1, an internal bead cutting and shredding device 1 provided on a mandrel 2 cantilevered outside an ERW pipe A in an ERW pipe A whose top is welded by ERW and conveyed in the direction of an arrow. Is installed. The mandrel 2 is inscribed in the vicinity of a vertex serving as a welded joint of the electric resistance welded tube A, and is supported by a substantially drum-shaped upper support roller 3 provided so as to roll in the pipe axis direction. It is supported in the electric resistance welded tube A by a drum-shaped lower supporting roller 4 provided to roll in the tube axis direction. In this state, since the upper support roller 3 and the lower support roller 4 support the upper and lower tube walls of the electric resistance welded tube A, the cutting conditions for the inner bead B by the cutting tool 5 set in advance are maintained. In addition, the upper support roller 3
A groove is provided on the outer periphery of the roller so that the inner bead B does not contact the outer peripheral surface of the roller. Note that a plurality of upper support rollers 3 may be provided with the upper support roller 3 interposed therebetween. With the transport of the ERW pipe A, the cutting tool 5 installed on the mandrel 2 continuously cuts the inner surface bead B. The cutting waste C generated at this time is
It is introduced from above the guide hole 6A of the guide block 6 provided above and discharged from below. At the lower part of the guide block 6, there is provided a cutting waste cutter 7 composed of a fixed blade block 8 and a movable blade block 9 whose sliding surfaces in the tube axis direction are in contact with each other. The fixed blade block 8 has a hole having substantially the same size as the guide hole 6A and is detachably mounted on the guide block 6. Meanwhile, mandrel 2
A cutter hydraulic cylinder 10 is provided so that the drive shaft 11 reciprocates in the pipe axis direction of the ERW pipe A, and hydraulic pipes 12A and 12B drawn from outside the ERW pipe A are connected to each other. A slide base 14 having a plate structure and having a sliding surface in mutual contact with the mandrel 2 and sliding back and forth in the pipe axis direction is connected to the drive shaft 11 via a connection bolt 13. The slide base 14 is used for the cutter hydraulic cylinder 1
This is a structure for transmitting the driving operation by the control unit 0 to the movable blade block 9. A cutter hydraulic cylinder 10 is connected to one end, and the movable blade block 9 is detachably fixed to the other end. The internal bead cutting and shredding device 1 provided with such a cutting dust cutter 7 causes the cutter hydraulic cylinder 10 to reciprocate at an appropriate speed so as to be discharged from the lower portion of the guide hole 6A of the guide block 6. Can be reliably shredded.

In FIG. 2, the mandrel 2 is supported in the electric resistance welded tube A by a substantially drum-shaped tension roller 23 instead of the lower support roller 4 shown in FIG. And shaft holes 2 provided at both ends thereof
In the swing arm 24 composed of 6A and 26B,
The tension roller 23 is rotatably attached to the shaft hole 26A by a roller pin 27, and the swing arm 24 itself is connected to the mandrel 2 by an arm pin 28.
It was rotatably attached to the lower part. On the other hand, an arm hydraulic cylinder 20 is provided on the mandrel 2 and connected to hydraulic pipes 22A and 22B drawn in from the outside of the electric resistance welded pipe A, and its drive shaft 21 intersects perpendicularly with the pipe axis of the electric resistance welded pipe A. Reciprocate in the direction of The tip of the drive shaft 21 is made substantially hemispherical, and is brought into contact with a substantially spherical recess provided on the arm portion 25 of the swing arm 24.
The internal bead cutting and shredding device 1 configured as described above drives the arm hydraulic cylinder 20 to move the drive shaft 21 up and down, whereby the swing arm 24 rotates in association with the arm pin 28 by a predetermined angle. I do. Therefore, when the drive shaft 21 of the arm hydraulic cylinder 20 is driven in a downward direction with the tension roller 23 in contact with the inner wall of the electric resistance welded tube A, the driving force is transmitted to the tension roller 23 and the upper support roller 3, Sewing tube A
The pressing force against the inner wall is balanced, and the mandrel 2 is supported in the ERW tube A. In addition, even if the inner wall of the electric resistance welded pipe A changes by a certain distance in a direction perpendicular to the pipe axis, the tension roller 23 rolls on the pipe inner wall in the pipe axis direction while maintaining the state of contact with the inner wall. In other words, mandrel 2
Due to the operation of the drive shaft 21 of the arm hydraulic cylinder 20 and the hydraulic control, even if the pipe diameter of the ERW pipe A changes within a certain range,
The combination of the upper support roller 3 and the tension roller 23 allows the inner bead B to be reliably supported in the electric resistance welded tube A without hindering cutting and shredding. The slide base 14 reciprocates and the arm hydraulic cylinder 20
Notches are provided on the slide base 14 to avoid contact with each other.

[0016]

Since the present invention is configured as described above, the following effects can be obtained.

In the internal bead cutting and shredding device according to the first aspect, the conventional internal bead cutting and shredding operations involving skill and danger by manual labor are completely mechanized. It is cut securely, safely and efficiently and does not deteriorate the properties of the inner wall of the ERW tube.

In the internal bead cutting and shredding device according to the second aspect, since the same device can be commonly applied to a certain range of pipe diameters, it is not necessary to prepare various kinds of pipe diameters having different sizes. In addition, it is possible to greatly reduce the work of exchanging the device every time an electric resistance welded pipe having a different pipe diameter is manufactured.

[0019]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part in which an inner bead cutting and shredding device is installed in an electric resistance welded pipe.

FIG. 2 is a sectional view of a main part showing a state where a tension roller is provided in the inner bead cutting and shredding device of FIG. 1;

[Explanation of symbols]

 Reference Signs List A ERW pipe B Inner bead C Inner bead cutting debris 1 Inner bead cutting and shredding device 2 Mandrel 3 Upper support roller 4 Lower support roller 5 Bit 6 Guide block 6A Guide hole 7 Cutting debris cutter 8 Fixed blade block 9 Moving blade block DESCRIPTION OF SYMBOLS 10 Cutter hydraulic cylinder 11 Drive shaft 12A, 12B Hydraulic piping 13 Connecting bolt 14 Slide base 20 Arm hydraulic cylinder 21 Drive shaft 22A, 22B Hydraulic piping 23 Tension roller 24 Swing arm 25 Arm 26A, 26B Shaft hole 27 Roller pin 28 Arm pin

Claims (2)

[Claims] 1. A mandrel (2) with a cutting tool (5).
The mandrel (2) is connected to the ERW pipe by an upper support roller (3) and a lower support roller (4) which are mounted on the inner wall of the ERW pipe (A) so as to be rotatable in the pipe axis direction. (A), a movable blade block (9) interlocking with a drive shaft (11) of a cutter hydraulic cylinder (10) provided on the mandrel (2) and operating in a pipe axis direction, forms an inner bead cutting waste. An internal beat cutting and shredding device for an electric resistance welded tube, which is configured to slide in contact with a fixed blade block (8) fixed on the mandrel (2), provided at a passage position of (C). 2. An electric resistance welded tube (A) so as to be in contact with an inner wall of the tube.
The upper support roller (3) on the inner bead side on the mandrel (2) and the tension roller (2) on the opposite inner bead side.
3) are mounted so as to be rotatable in the pipe axis direction and supported in the electric resistance welded pipe (A), and the drive shaft (2) of the arm hydraulic cylinder (20) which operates in the direction intersecting the pipe axis.
2. An internal beat cutting and shredding device for an electric resistance welded pipe according to claim 1, wherein the tension roller (23) and the tension roller (1) are interlocked.