JP2006205312A - Processing method and processing system of seam welded steel pipe inner surface bead chip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a processing method and a processing system of seam welded steel pipe inner surface bead chips, for reducing the size of a pipe making line, by easily discharging the chips, even if a blow process of the inner surface bead chips is not arranged in the pipe making line, by not only smoothly and stably performing processing of the inner surface bead chips, even if a traveling speed of a seam welded steel pipe on the pipe making line is faster than 60 m/min. <P>SOLUTION: A technology for discharging and removing generated belt-like chips outside the pipe, is improved by cutting an inner surface bead formed in a pressure contact seam of an upper inner surface of a traveling seam welded steel pipe on the pipe making line of the seam welded steel pipe for bringing its both ends into pressure contact by a squeeze roll, by molding a steel strip in a cylindrical shape. A cutting position of the inner surface bead is changed in response to a traveling speed of the seam welded steel pipe, and its change is moved to the downstream side in the pipe making direction along a manufacturing line in response to an increase in the traveling speed, and the chips are guided to the upstream side in the pipe making direction, and are cut by extracting upward from a steel strip position existing in a semicylindrical state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a processing method and a processing apparatus for an inner surface bead cutting waste of an electric resistance steel pipe, and more specifically, a belt-shaped cutting waste generated by cutting an inner surface bead formed during seam welding of an electric resistance steel pipe with a bite, The present invention relates to a technique for continuously extracting and processing the outside of an electric resistance steel pipe.

  An electric resistance steel pipe is manufactured by rounding a steel strip in the width direction and welding both peripheral ends. Specifically, as shown in the example of the manufacturing process (also referred to as a pipe making line) in FIG. 6, the coiled steel strip 1 is rewound with a payoff reel (also referred to as an uncoiler) 2, flattened with a leveler 3, and with an edge mirror 4. After preparing both ends, it is molded into a cylindrical shape with a group of molding rolls. That is, the width end portion is bent by the edge bend roll 5, and then the width center portion is gradually bent by the center bend roll 7 group while the width end portion is restrained by the cage roll group 6, and both peripheral ends of the steel strip 1 are pushed. A so-called “open tube” cylindrical body that is simply combined is used. The open pipe is continuously arranged with a cylindrical shape and a peripheral end portion (hereinafter referred to as a seam) just joined by the fin pass roll group 8, and the seam is heated by a work coil (or contact tip) 9. The squeeze roll 10 is joined by pressure welding to form an electric-welded steel pipe 11 (also simply referred to as a pipe 11).

  In the manufacture of the electric resistance welded steel pipe 11, the portion that has been melted or semi-molten by heating with the work coil 9 of the seam is pushed out from the seam by pressure contact with the squeeze roll 10, and rises to the inner and outer surfaces. It forms a coagulum called a so-called “bead”. As shown in FIG. 5, this bead is formed continuously along the longitudinal direction of the tube 11, and the outer bead 12 is formed on the outer surface of the tube and the inner bead 13 is formed on the inner surface. It is called.

  These outer surface beads 12 and inner surface beads 13 not only deteriorate the internal appearance of the electric resistance welded steel pipe 11, but also interfere with various operations in the downstream process from the joining position, and are therefore removed in the pipe forming line. There is a need. Conventionally, the removal has been performed by removing the generated cutting waste after pressing the cutting tool 14 against each of the outer bead 12 and the inner bead 13.

  By the way, as shown in FIG. 6, the outer bead 12 is cut outside the tube 11, so that the cutting tool 14 can be disposed, the cutting waste can be easily removed, and the like. On the other hand, since the inner surface bead 13 must be cut inside the tube 11, it is necessary to devise the arrangement of the cutting tool 14, the cutting waste removal process, and the like. As shown in FIG. 7, a conventional inner surface bead cutting tool (hereinafter referred to as an inner surface cutting tool) 14 is inserted into the tube 11 and fixed at a fixed position at the tip of a rod-like body called an inner bar 15. It is designed to be installed there. And since the inner surface bead 13 itself is continuously formed along the longitudinal direction of the tube 11, continuous strip-shaped cutting waste 17 is generated by cutting.

  Conventionally, as shown by the dotted line in FIG. 6, the strip-shaped cutting waste 17 proceeds downward in the pipe (downstream in the pipe forming direction indicated by the arrow) due to the warpage of the internal cutting tool 14, and the tool holder 16. Are accumulated in the pipe through the hole (cavity part) 18 (see, for example, Patent Documents 1 and 2). In order to facilitate the post-processing, although not shown, the strip-shaped cutting waste 17 is cut into short chips with a rotary blade or bead cutting machine provided on the bite holder 16. (For example, see Patent Documents 3 and 4).

  The internal bead cutting waste 17 accumulated in the pipe is not shown in the figure after the pipe 11 has been cut to a predetermined length in the downstream process in both cases of the above-described band shape and short chip shape. Higher pressure air or the like was blown and ejected from the other end for removal. Therefore, it was necessary to arrange a bead blow process for blowing this high-pressure air or the like in the pipe making line.

  However, the arrangement of the bead blow process not only complicates the pipe making line but also becomes an obstacle to downsizing. Therefore, the present applicant firstly cuts the inner bead formed at the seam of the ERW steel pipe, and discharges and removes the strip-shaped cutting waste generated in the pipe outside the pipe. The tip is gripped by gripping means, guided so that the tip is directed upstream in the pipe forming direction, and the cutting waste is continuously extracted from the pipe gap before the joint joining. As shown in FIGS. 2 (a) and 2 (b), as shown in FIG. 2 (a) and FIG. 2 (b), an inner bar 15 that is inserted into the pipe and fixed at a fixed position, and a tip of the inner bar 15 are arranged. A processing device for strip-shaped electric-welded steel pipe inner surface bead cutting waste generated by cutting with an inner surface bead cutting device provided with a cutting tool 14 attached to the upper part of a set tool holder 16, It is inserted into the tube 11 so as to be positioned, A bead discharge duct 20 (also referred to as a discharge path 20) through which the shavings 17 pass, a tong-shaped gripping means 21 for gripping the tip of the cutting waste 17 that has descended into the bead discharge duct 20, and a tip of the cutting waste 17 A supporting means 22 for supporting the gripping means 21 that is closed when the cutting waste 17 is detected and moving the inside of the bead discharge duct 20, and a bead discharge of the support means 22. A treatment apparatus for bead cutting waste on an inner surface of an ERW steel pipe characterized in that it is provided with pushing and pulling means 28 into the duct 20 (see Patent Document 5). And by these technologies, the cutting waste 17 can be easily discharged out of the pipe without arranging the blow process of the inner surface bead cutting waste in the pipe making line of the ERW steel pipe. It was expected that not only compacting would be achieved, but also smooth and stable internal bead cutting waste could be treated.

However, ERW steel pipes that run on actual pipe making lines have different running speeds depending on the steel type, size, etc. for the sake of production efficiency. And when the traveling speed is relatively slow up to 60 m / min, the above technology has confirmed that the inner bead cutting process is performed very well. However, when the traveling speed is further increased, the cutting process is performed. Tended to be unable to be performed smoothly and stably.
JP 2003-164994 A JP-A-5-69217 JP-A-3-30115 JP 11-33814 A Description of Japanese Patent Application No. 2004-346141

  In view of such circumstances, the present invention is not only capable of smoothly and stably treating the inner surface bead cutting waste even when the traveling speed of the ERW steel pipe on the pipe making line is higher than 60 m / min. A method for treating inner surface bead cutting scraps of an electric-welded steel pipe that can easily discharge the cutting scraps without providing a blow process of inner surface bead cutting scraps in the pipe forming line of the sewn steel pipe, and achieves downsizing of the pipe forming line, and An object is to provide a processing apparatus.

  The inventor has intensively studied to achieve the above object, and the results have been embodied in the present invention.

  That is, the present invention is an ERW steel pipe that runs horizontally on a pipe making line of an ERW steel pipe in which a steel strip is rounded in the width direction and formed into a cylindrical shape, and the attached ends are pressed by a squeeze roll. When cutting the inner surface bead formed on the pressure contact seam of the upper inner surface of the pipe and discharging and removing the strip-shaped cutting waste generated in the pipe to the outside of the pipe, the cutting position of the inner surface bead depends on the traveling speed of the ERW steel pipe. As the travel speed increases, the change moves along the pipe forming line to the downstream side in the pipe forming direction, and the generated strip-shaped cutting waste is guided upstream in the pipe forming direction. And it is the processing method of the electric-welded steel pipe inner surface bead cutting waste which is extracted upward from the steel strip position in the semi-cylindrical state before the pressure welding and cut into a chip shape or wound into a coil shape. In addition, the present invention is a method of rolling an electric strip running horizontally on a pipe forming line of an electric resistance welded steel pipe in which a steel strip is rounded in the width direction and formed into a cylindrical shape, and both ends thereof are pressed with a squeeze roll. A cutting tool that continuously cuts the inner surface bead formed on the pressure welded joint of the upper inner surface of the sewn steel pipe, a tool holder that has a cavity that guides the generated strip-shaped cutting waste downward in the pipe, and a cutting in the cavity A cutting waste extraction means for gripping the tip of the waste and guiding the discharge path, and a cutting waste treatment means for cutting the cutting waste into a chip shape or winding it into a coil shape. In the processing apparatus, a floating body provided with a means capable of moving forward and backward and maintaining a constant posture is disposed in the pipe, and the cutting tool, the bite holder and the strip-shaped cutting waste are placed in a fixed position on the floating body in the pipe forming direction. Cutting waste extraction means to guide upstream A processing apparatus of ERW steel pipe inner surface bead, characterized in that the. In this case, the cutting waste extraction means includes a discharge path through which the strip-shaped cutting waste passes through the inside of the tube, a tong-shaped gripping means for holding the tip of the cutting waste that has fallen into the discharge path, and a tip of the cutting waste. A sensor for detecting gripping, a supporting means for supporting the gripping means closed when the cutting waste is detected, and moving the inside of the discharge path, and a forward and backward movement of the support means in the discharge path It is preferable to provide a moving means. Further, it is preferable to dispose a posture stabilizing roller for supporting the floating body below the floating body.

  According to the present invention, even when the traveling speed of the electric resistance steel pipe on the pipe making line is faster than 60 m / min, not only the inner bead cutting waste can be treated smoothly and stably, but also the electric resistance steel pipe Even if the internal bead cutting waste blowing process is not provided in the pipe making line, the cutting waste can be easily discharged, and the pipe making line can be made compact.

  Hereinafter, the best embodiment of the present invention will be described based on the background of the invention.

  First, the inventor applied the above-mentioned unpublished technology (hereinafter referred to as “prior art unpublished technology”) to smooth the inner bead when the running speed of the ERW steel pipe on the pipe making line is higher than 60 m / min. We pursued the cause of being unable to cut stably. As a result, it was concluded that there was a cause in that the cutting position of the inner surface bead was fixed. In other words, as shown in FIGS. 2 (a) and 2 (b), the prior application unpublished technique is such that the cutting tool 14 is inserted into the pipe and fixed at a fixed position at the tip of the inner surface bar 15. Attached to the upper part of the holder 16, the cutting position is always constant. By the way, in the existing pipe making line, the cutting tool 14 is fixed 1.1 m downstream from the position of the work coil (which may be a contact tip) that heats the joint portion up to about 1500 ° C. and the squeeze roll that performs pressure contact. Had been placed. Therefore, when the traveling speed of the electric resistance welded steel pipe is 60 m / min (1 m / sec), the inner surface bead is cut 1.1 seconds (1.1 m / 1 m / sec) after the pressure welding. If it is 1.1 seconds, it is considered that the joint portion is sufficiently cooled and solidified and contracted inner surface beads are formed as judged from the cooling rate (about 400 ° C./sec) in normal atmospheric cooling. . On the other hand, for example, when the traveling speed is as high as 80 m / min (1.33 m / sec), cutting is performed after 0.8 seconds (1.1 m / 1.33 m / sec) has elapsed since the press contact. However, at that time, the seam portion is not yet sufficiently cooled and is in a semi-molten state, and the solidified fixed shape inner bead 13 is not necessarily formed, and the cutting target is indefinite, smooth, and stable cutting. Of course, you can't. That is, the inner bead 13 cannot be cut continuously and smoothly unless it is solidified and has a certain shape.

  Based on this knowledge, the inventor considered that the cutting position of the inner bead 13 needs to be changed according to the traveling speed of the ERW steel pipe 1 in order to smoothly and stably cut the inner bead 13. The important requirement is that "the position change moves along the pipe forming line to the downstream side in the pipe forming direction as the traveling speed increases." Inducing to the upstream side of the pipe forming direction, extracting upward from the steel strip position in the semi-cylindrical state before the pressure welding, cutting into a chip shape or winding up in a coil shape " The present invention has been completed. The latter requirement was added, which is the second object of the present invention, “Even if the inner bead cutting waste blowing process is not arranged in the pipe forming line of the electric resistance welded steel pipe, the cutting waste can be easily discharged, This is in order to simultaneously achieve the “compression of the pipe making line is achieved”.

  In the present invention, the relationship between the traveling speed of the ERW steel pipe and the inner bead cutting position (distance downstream from the squeeze roll in the pipe forming direction) is not particularly limited. The relationship varies depending on the steel type and size (outer diameter, wall thickness, etc.) of the ERW steel pipe, the heating temperature of the work coil, etc., so it will be determined based on past operation data or test operations. is there.

  Next, the inventor also examined means for actually carrying out the present invention as the above-described cutting waste processing method. That is, the existing “steel strip 1 shown in FIG. 7 is rounded in the width direction and formed into a cylindrical shape, and then the joined ends of the electric resistance welded steel pipe 1 are pressed with a squeeze roll 10. A cutting tool 14 that continuously cuts the inner surface bead 13 formed on the pressure joint of the upper inner surface of the ERW steel pipe 1 that is running horizontally, and a cavity that guides the generated strip-shaped cutting waste 17 downward in the pipe 1. A cutting tool 16 having a portion 18, a tip for cutting waste 17 in the hollow portion 18, and cutting waste extraction means for guiding the discharge path 20. The cutting waste 17 is cut into a chip shape or coiled. This is a modification of the processing device for bead cutting scraps on the inner surface of an electric resistance welded steel pipe provided with cutting waste processing means (a cutting machine 31, a winding device 32, etc., see FIG. 2 (a)).

  First, in a conventional pipe forming line, as shown in FIG. 1, a floating body 36 having means for allowing advancing and retreating and maintaining a constant posture is disposed in a pipe 11 press-contacted with a seam. The floating body 36 is not particularly limited in size and shape. For example, it is preferable that the floating body 36 has a certain length, has a circular cross section, and has a rod shape like the conventional fixing bar 15. Here, the reason why the inner bead 13 can be moved forward and backward is to make the cutting position of the inner bead 13 variable, and the inner bead 13 is provided with means for maintaining a constant posture. This is because it is formed along the axial direction above the inner surface of the sewn steel pipe 11, so that the inner bead 13 must always be in contact with the cutting tool 14 fixedly attached to the fixed body 36 at a fixed position. As a means for making the advance and retreat freely, it is not necessary to provide a special drive mechanism, and it may be simply inserted into the tube 11 so as to move by friction accompanying the movement of the tube 11. Further, as the means 37 for maintaining a constant posture, for example, a posture stabilizing roller, a wheel or the like may be disposed below the movable body 36. It should be noted that these posture stabilizing rollers, wheels, and the like are also effective for advancing and retreating the moving body 36. Further, since it is necessary to stop the floating body 36 when the cutting position is determined, the floating body 36 includes a stop wire 38 extending horizontally outside the tube 11 at its rear end, a winding means 39 for the wire, and the like. And the movable body 36 can be stopped. If it does not stop, the reaction force does not act on the inner surface bead 13 in contact with the cutting tool 14, and cutting is impossible. Further, in order to fix and attach the cutting tool 14 to a fixed position of the floating body 36, as shown in FIG. 1, as shown in FIG. 1, a tool holder 16 having a cavity portion (cutting hole extraction hole) 18 is provided in the floating body 36. Yes.

  Furthermore, if the inventor can move the cutting waste 17 to the upstream side in the pipe forming direction as opposed to the conventional case, it can be extracted from the gap formed above the so-called “open pipe” before welding the seam. Thought. And the means which orient | assigns the front-end | tip of the cutting waste 17 to the upstream of a pipe making direction was examined concretely. As a result, when the cutting waste 17 descends in the bite holder 16 immediately after being cut, the tip is gripped by the gripping means, and the tip is directed upstream in the pipe forming direction, as shown in FIGS. The structure described in b) was decided. This is because the cutting waste 17 can be guided to the gap before the seam joining and continuously extracted outside the pipe. That is, if the gap can be guided to the gap, thereafter, as shown in FIG. 1, the tip of the cutting waste 17 drawn out of the tube 11 is separated from the gripping means 21 by a cutting waste processing means (for example, cutting waste winding). The reel of the picking device 31 is held and pulled out. Thereafter, the cutting waste 17 may be wound up in a coil shape, or may be cut into chips sequentially from the tip.

  The details of the processing apparatus according to the present invention will be described more specifically. As is clear from FIGS. 1 and 2B, first, the discharge path 20 through which the strip-shaped cutting waste 17 passes is described above. It inserts in the pipe | tube 11 located under the floating body 36, and the front-end | tip is attached to the cavity 18 of the bite holder 16. FIG. Thereby, the cutting waste 17 of the inner surface bead 13 cut by the cutting tool 14 descends into the discharge path 20 through the cavity 18 of the tool holder 16 as shown in the detailed view of FIG. In the present invention, a tong-shaped gripping means 21 for gripping the tip of the cutting waste 17 and a sensor 26 for detecting that the tip of the cutting waste 17 is gripped are inserted into the discharge path 20. (See FIG. 2 (b)).

  There are various types of tong-shaped gripping means 21 for gripping the tip of the cutting waste 17, but a combination of two serrated members 24 and a spring 25, as shown in FIG. 2 (b). Is available. That is, when the tip of the cutting waste 17 is not gripped, the two serrated members 24 are opened by the stopper 27 (shown by a solid line in FIG. 2B), and when gripping, The stopper 27 comes off, and the two serrated members 24 are closed by a spring force, and the tip of the cutting waste 17 is sandwiched and pressed (shown by a broken line in FIG. 2B). Although there are various methods for removing the stopper 27, it is preferable that the stopper 27 is formed of a heat-meltable material (for example, tin alloy) and melted by the heat of the cutting waste 17.

  The sensor 26 is provided with another wire 23 attached to a support means (for example, a wire) 22 of a gripping means 21 that moves forward and backward in the discharge path 20, and is disposed at the tip of the other wire 23. Laser type detectors can be used. A proximity switch 34 is attached to the spring 25 that supports the rear end of the serrated member. When the two serrated members have not yet grasped the cutting waste 17, the proximity switch attached to the spring 25 is used. The head 35 of the proximity switch 34 is located in the field of view of the sensor (laser light). However, when the stopper 27 is removed and the cutting waste 17 is gripped, the head 35 of the proximity switch 34 is deformed by the deformation of the spring 25. Since it forms so that it may remove | deviate from the said visual field, if the situation remove | deviated from this visual field is detected, the front-end | tip of the cutting waste 17 will be hold | gripped.

  Further, since the gripping means 21 needs to be moved in the discharge passage 20 by the support means 22, the support wire 22 is provided with pushing and pulling means 28 as shown in FIG. A pair of rolls 29 is used as the pushing and lifting means 28. This is because the support means 22 is sandwiched between the rolls 29 and the roll 29 is rotated so that the support means 22 can be easily pushed into or removed from the discharge path 20.

  According to the present invention having such a device configuration, the cutting waste can be smoothly discharged out of the tube. In addition, even if the cutting waste 17 is cut off in the middle, it is possible to search for the tip after the cutting with the sensor 26 and grip it again with the gripping means 21, so that a stable discharging operation can be performed.

  In addition, in the present invention, in order to make it easier to grip the tip of the cutting waste, as shown in FIG. 3, the cutting waste 17 is placed at a position in the discharge path 20 where the cutting waste 17 descends. You may make it provide the roller 30 which bends a front-end | tip to the upstream of a pipe making direction. This is because the roller 30 does not need to be provided with a dedicated driving means, and rotates by contacting the bottom surface of the moving pipe, and acts to bend the tip of the cutting waste 17 upstream in the pipe forming direction.

  In addition, in the present invention, as shown in FIGS. 4 (a) and 4 (b), the supporting means 22 is pushed out of the pipe in the vicinity of the pushing-in and lifting means 28 into the discharge passage 20. It is preferable that a winding means 31 for the strip-shaped cutting waste 17 or a cutting machine 32 for cutting into chips is provided. This is because the post-treatment of the cutting waste 17 can be performed more easily and quickly.

Example 1
A steel strip with a steel composition equivalent to JIS STPL380 is formed into an open pipe on the ERW steel pipe production line, and the seam is electro-welded to produce an ERW steel pipe with an outer diameter of 457.2 mm and a wall thickness of 19.0 mm. did. The current condition of the welding machine was 300 kHz × 700 kW, and the contact tip 9 was used as the power feeding means for heating the joint. And the traveling speed of the electric resistance welded steel pipe was 80 m / min.

  The present invention using the floating body 36 was applied to this operation, and post-treatment of the cutting waste was performed. That is, the floating body 36 described with reference to FIG. 1 is disposed, the cutting position is stopped by 0.4 m downstream of the conventional pipe forming direction, the inner bead 13 is cut by the cutting tool 14, and the resulting belt-like shape is formed. The cutting waste 17 was processed. The cutting waste 17 was wound up by the winding means 31 (of the winder type in which rotation drive control is performed using a 2 kW motor) in FIG.

As a result, the continuously generated belt-shaped inner surface bead cutting waste is smoothly and stably cut, transferred to the gap in the upstream open pipe without being blown as in the prior art, and discharged outside the pipe. And was able to be wound into a coil.
(Example 2)
A steel strip with a steel composition equivalent to JIS STKM13 is formed into an open pipe on an ERW steel pipe production line, and the seam is welded to produce an ERW steel pipe with an outer diameter of 89.1 mm and a wall thickness of 6.0 mm. did. The current condition of the welding machine was 350 kHz × 450 kW, and the work coil 9 was used as a power feeding means for heating the joint. And the running speed of the electric resistance steel pipe was 70 m / min.

  The present invention using the floating body 36 was applied to this operation, and the cutting waste 17 was processed. That is, the floating body 36 described with reference to FIG. 1 is disposed, the inner bead 13 is cut with the cutting tool 14 at a cutting position of 0.2 m downstream of the conventional pipe forming direction, and the resulting strip-shaped cutting waste 17 is generated. Was processed. In this case, the roller shown in FIG. 3 was also provided, and the tip of the cutting waste 17 was bent in the direction opposite to the pipe making direction. The discharged cutting waste 17 was cut into chips by the cutting machine 32 shown in FIG.

As a result, the continuously generated belt-shaped inner surface bead cutting waste can be smoothly transferred to the gap between the open pipes on the upstream side and discharged to the outside of the pipe more easily than in the case of the first embodiment. I was able to cut.
(Comparative Example 1)
A steel strip with a steel composition equivalent to JIS STPL380 is formed into an open pipe on the ERW steel pipe production line, and the seam is electro-welded to produce an ERW steel pipe with an outer diameter of 457.2 mm and a wall thickness of 19.0 mm. did. The current condition of the welding machine was 300 kHz × 700 kW, and the contact tip 9 was used as the power feeding means for heating the joint. The traveling speed of the ERW steel pipe was 80 m / min.

  For this operation, the inner bead 13 was cut with a cutting tool 14 fixed at a downstream side in the pipe forming direction by 1.1 m from the squeeze roll 10 using a fixed bar 15 as in the conventional cutting position, and the resulting belt-like shape The cutting waste 17 was processed. The cutting waste 17 was wound up by the winding means 31 (of the winder type in which rotation drive control is performed using a 2 kW motor) in FIG.

  As a result, the internal bead cutting waste cannot be stably cut, and the cutting waste 17 cannot be transferred to the gap between the upstream open pipes as in the prior art, and can be smoothly discharged outside the pipe and wound in a coil shape. It was.

It is a schematic diagram which shows the processing apparatus of the ERW steel pipe inner surface bead cutting waste which concerns on this invention. It is a figure which shows the important structural part of the processing apparatus of the ERW steel pipe inner surface bead cutting waste described in Unexamined-Japanese-Patent No. 2004-346141, (a) is a cross section of the whole, (b) is a part enclosed with (a). FIG. 6 is a diagram showing a plane in the vicinity of the gripping means, taken along line AA of FIG. It is a cross-sectional view which shows the condition which employ | adopted the roller for the processing apparatus of the ERW steel pipe inner surface bead cutting waste which concerns on this invention. It is a figure which shows the processing means of the strip-shaped cutting waste extracted out of the pipe | tube, (a) is a winding machine, (b) is a cutting machine cut | judged in a chip shape. It is a pipe sectional view explaining a bead which occurs in an electric resistance steel pipe. It is a schematic diagram which shows the manufacturing process (line) of an electric resistance steel pipe. It is a perspective view which shows the processing method of the conventional cutting waste. It is a cross-sectional view which shows the detail of the part enclosed by the circle of Fig.1 (a).

Explanation of symbols

1 Coiled steel strip (steel strip)
2 Payoff reel (Uncoiler)
3 Leveler 4 Edge mirror 5 Edge bend roll 6 Cage roll group 7 Center bend roll group 8 Fin pass roll group 9 Work coil (contact tip)
10 Squeeze Roll 11 ERW Steel Pipe (Tube)
DESCRIPTION OF SYMBOLS 12 Outer surface bead 13 Inner surface bead 14 Inner surface or outer surface bead cutting tool 15 Inner surface bar 16 Tool holder 17 Cutting waste 18 Cutting waste extraction hole (cavity part)
20 Bead discharge duct (discharge channel)
21 Grasping means (eg, magic hand)
22 Support means (for example, wire)
23 Another wire 24 Sawtooth member 25 Spring 26 Sensor 27 Stopper 28 Pushing and lifting means 29 A pair of rolls 30 Rollers 31 Winding means 32 Cutting machine 34 Proximity switch 35 Head 36 Moving body 37 Means for maintaining a constant posture (posture stability) Rollers, wheels, etc.)
38 Stopping wire 39 Stopping wire winding means

Claims (4)

The welded seam of the upper inner surface of the ERW steel pipe that runs horizontally on the pipe line of the ERW steel pipe that is rolled in the width direction, formed into a cylindrical shape, and then pressed together with a squeeze roll. When cutting the inner surface bead formed in and discharging and removing the strip-shaped cutting waste generated in the pipe outside the pipe,
The cutting position of the inner surface bead is changed in accordance with the traveling speed of the ERW steel pipe, and the change is moved to the downstream side in the pipe forming direction along the pipe forming line as the traveling speed increases. The generated strip-shaped cutting waste is guided upstream in the pipe forming direction, extracted upward from the steel strip position in the semi-cylindrical state before the pressure welding, cut into a chip shape, or wound into a coil shape. The processing method of the bead cutting waste inside an ERW steel pipe. The steel strip is rounded in the width direction, formed into a cylindrical shape, and then the upper inner surface of the ERW steel pipe running horizontally on the ERW pipe making line where both ends are pressed together with a squeeze roll. A cutting tool that continuously cuts the inner surface bead formed at the pressure welding seam, a tool holder that has a cavity that guides the generated strip-shaped cutting waste downward in the pipe, and a tip of the cutting waste in the cavity. In the processing device for ERW inner pipe bead cutting waste comprising cutting waste extraction means for guiding the discharge path, and cutting waste processing means for cutting the cutting waste into a chip shape or winding it into a coil shape,
Arranged in the tube is a floating body that is capable of moving forward and backward and maintaining a constant posture, and guides the cutting tool, the bite holder, and the strip-shaped cutting waste to the upstream side in the pipe forming direction at a fixed position of the floating body. An apparatus for processing an inner bead of an electric resistance welded steel pipe, characterized in that a cutting waste extracting means is provided.   The cutting waste extraction means grips the discharge path through which the strip-shaped cutting waste passes through the inside of the pipe, the tong-shaped gripping means for gripping the tip of the cutting waste that has fallen into the discharge path, and the tip of the cutting waste. A sensor for detecting this, a support means for supporting the gripping means closed when the cutting waste is detected, and moving the inside of the discharge path, and a moving means for moving the support means back and forth in the discharge path The processing apparatus of the bead cutting waste of an electric-welded steel pipe inner surface of Claim 2 characterized by the above-mentioned.   4. An apparatus for treating bead cutting waste on an inner surface of an electric resistance welded steel pipe according to claim 2, wherein a posture stabilizing roller for supporting the floating body is disposed below the floating body.

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