JP2005103666A - Method of disposing inner surface bead chip of electro-resistance-welded tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of disposing inner surface bead chips of an electro-resistance-welded tube that omits an inner surface bead chip discharge process such as a bead blowing process in the lower reaches. <P>SOLUTION: An inner surface bead formed at a joint 31 of the electro-resistance-welded tube 40 is cut, and the inner surface bead chips 9 (or 9A) produced by cutting are transferred upstream in a tube making direction 13 and discharged to the outside of the tube. The continuous strip chip 9 is transferred and discharged by a guide mechanism combining bending rollers 21, 22 and a belt conveyor 23 and wound by a winding device 24. The short chip-like chips 9A are sucked by a suction device 27 via a suction tube 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an inner surface bead cutting waste disposal method for an electric resistance welded tube.

  An electric resistance welded tube forms an open tube by rounding the width of the strip, and welds a seam formed by converging the peripheral end of the open tube (originally the wide end of the strip) into a V shape. Manufactured by doing. An example of the pipe making line is shown in FIG. In this example, a cage roll forming mill is used as the pipe making mill, but a breakdown roll forming mill may be used instead of the cage roll forming mill.

  The band plate 20 paid out from the payoff reel 1 is flattened by the leveler 16, joined to the preceding band plate at any time by a plate welding machine (not shown), and then the width end portion is bent by the edge bend roll 2, Next, the center portion of the width is gradually bent and formed by the center bend roll group 4 while the width end portion is restrained and supported by the cage roll group 3 to form the open pipe 30. The open pipe 30 is adjusted to the overall shape in the circumferential direction and the groove shape of the joint 31 by the fin pass roll group 5, and then the joint 31 is heated to the welding temperature by, for example, the work coil 6 (or contact tip) to continue the squeeze. The seam 31 is welded to form a pipe (electric sewing pipe) 40 by an electric resistance welding method in which the roll 7 is pressed. At this time, a melt or semi-melt generated by heating to the welding temperature is pushed out from the seam 31 to the inner and outer surfaces of the tube 40 by pressure welding, and a so-called bead (weld bead) is formed which solidifies in a raised state. .

  Since this bead becomes an obstacle when the electric sewing tube is adjusted in the downstream process, it is necessary to remove the bead in the pipe making line. An outer bead cutting bit 8 and an inner bead cutting bit 9 are arranged on the outlet side, and the former is used to cut and remove the outer bead on the tube outer surface (the outer bead) and the inner bead on the inner tube side (the inner bead). The method to do is adopted.

The inner surface bead cutting bit 9 is mounted on an inner surface bit holder 11 provided at the tip of the inner surface bar 10 as shown in FIGS. 1 and 2, and the inner surface bar 10 is inserted into the pipe and placed. The continuous belt-shaped inner surface bead cutting waste 15 generated by cutting the inner surface bead with the inner surface bead cutting bit 9 is moved downward in the pipe (downstream in the pipe forming direction 13) by the warp of the blade of the inner surface bead cutting bit 9. It advances and accumulates in a pipe | tube through the cutting waste passage hole 12 (for example, refer patent document 1, 2). In order to facilitate post-processing, it is also known that the continuous belt-shaped inner surface bead cutting scraps are cut into short chips by a rotating tool provided on the inner tool holder or a bead cutting machine (patent) References 3 and 4).
JP 2003-164994 A JP-A-5-69217 JP-A-3-300115 JP 11-33814 A

  The internal bead cutting waste accumulated in the pipe has conventionally been cut into a predetermined length in the downstream cut-off process in a continuous strip-like or short chip-like form, and then subjected to a bead blow process. High-pressure air was blown from one end in the pipe length direction, and was discharged from the pipe by being put on this high-pressure air and ejected from the other end, and it was necessary to arrange a bead blow line to perform this bead blow process . However, this bead blow line has a problem that hinders the downsizing of the ERW pipe production line.

  An object of the present invention is to solve this problem and to provide an inner surface bead cutting waste disposal method for an electric resistance welded tube that can omit an inner surface bead cutting waste discharging step such as a bead blow step on the downstream side.

The present invention cuts an inner surface bead formed at the seam of the ERW pipe, transfers the inner surface bead cutting waste generated by the cutting to the upstream side in the pipe forming direction, and discharges it to the outside of the pipe. It is an inner surface bead cutting waste disposal method of a sewing pipe.

  When the inner bead is cut with a fixed bite, the inner bead cutting waste generated becomes a continuous band. As a means for transferring the continuous belt-shaped inner surface bead cutting waste to the upstream side in the pipe forming direction, for example, a guide mechanism in which a bending roller and a belt conveyor are combined is preferably used. The strip-shaped inner surface bead cutting waste is preferably wound up by using a winding device.

  In addition, when the inner surface bead is cut with a fixed cutting tool and then cut with a rotating tool or a shearing cutter, or when directly cut with a rotating tool, the inner surface bead cutting waste generated becomes a short chip shape. A suction pipe is preferably used as means for transferring the short chip-shaped inner surface bead cutting waste to the upstream side in the pipe making direction and discharging it to the outside of the pipe. In addition, it is preferable that the short chip-shaped inner surface bead cutting waste after being discharged out of the pipe is accommodated in a suction device connected to the suction pipe.

  According to the present invention, the internal bead cutting waste generated by the internal bead cutting is transferred from the generation point (position of the internal bead cutting bite) to the upstream side in the pipe forming direction and discharged out of the pipe. No internal bead cutting waste remains in the downstream pipe. Therefore, the inner surface bead cutting waste discharging step such as the downstream side bead blowing step which has been conventionally required can be omitted.

  FIG. 3 is a schematic view showing an example of an embodiment for processing continuous strip-shaped cutting waste according to the present invention, FIG. 4 is a view taken along arrow AA in FIG. 3, and FIG. 5 is an arrow BB in FIG. FIG. As shown in these drawings, in order to transfer the continuous belt-shaped inner surface bead cutting scraps 15 cut out by the fixed cutting tool 9 to the upstream side in the pipe forming direction 13, the inner surface cutting tool holder 11 holding the fixed cutting tool 9 is used. For example, three sets of bending rollers 21 are arranged, and a belt conveyor 23, preferably a two-stage belt, is arranged on the inner surface bar 10 connected to the rear end of the inner surface bit holder 11, and inner surface beads are arranged. It is preferable that the continuous strip-shaped cutting waste 15 generated by the cutting operation of the cutting tool 9 is bent to the upstream side through the bending roller 21 and then transferred to the upstream side by being guided through the belt conveyor 23. Further, in order to discharge the continuous belt-shaped inner surface bead cutting waste 15 to the outside of the pipe, for example, two sets of bending rollers 22 are arranged on the exit side of the inner surface tool holder 11 on the belt conveyor 23, and the belt conveyor 23. It is preferable that the continuous belt-shaped inner surface bead cutting waste 15 coming out of the bend is bent upward by the bending roller 22 and discharged from the opening of the joint 31 of the open pipe 30 to the outside of the pipe. The continuous belt-shaped inner surface bead cutting waste 15 after being discharged out of the tube is preferably wound up by a winding device 24 disposed outside the tube.

  The bending rollers 21 and 22 and the belt conveyor 23 do not have to have a dedicated driving device, and are continuously strip-shaped that are cut out from the position where the inner bead cutting bit 9 is disposed as the pipe 40 is fed in the pipe forming direction 13. It rotates following the contact with the inner surface bead cutting waste 15. On the other hand, the winding device 24 has a dedicated driving device, and it is preferable to use a driving device that can change the winding speed in accordance with the pipe making speed (welding speed).

  In the example of FIG. 3, the seam of the open tube 30 is heated by the work coil 6, but a contact tip may be used instead of the work coil 6.

  FIG. 6 is a schematic view showing an example of an embodiment for processing short chip-shaped inner surface bead cutting waste according to the present invention, FIG. 7 is a view taken along the line CC of FIG. 6, and FIG. FIG. As shown in these drawings, in order to transfer the short chip-shaped inner surface bead cutting scraps 17 cut out by the rotary cutting tool 9A to the upstream side in the pipe forming direction 13 and discharge it outside the pipe, the rotating cutting tool 9A is used. A hopper 26 is disposed on the inner surface bit holder 11 to be held, one end of the suction pipe 25 is connected to the lower end of the hopper 26, the suction pipe 25 is laid along the inner surface bar 10 upstream, and the other end is an open pipe. Connected to the suction device 27 installed outside the tube through the opening of the joint 31 of 30, and operated the suction device 27 to create a suction air flow in the suction tube 25, put on this suction air flow, The short chip-shaped inner surface bead cutting waste 17 that has fallen into the hopper 26 is preferably sucked into a bag (not shown) in the suction device 27 via the suction pipe 25. The suction device 27 can be constituted by a blower or a suction pump.

  In the example of FIG. 6, the seam of the open tube 30 is heated by the work coil 6, but a contact tip may be used instead of the work coil 6. In addition, the inner surface bead is directly cut by the rotating cutting tool 9A, but instead of this, continuous strip-shaped cutting chips cut by the fixed cutting tool may be cut by a rotating cutting tool or a shearing cutter.

A process for producing an ERW tube having an outer diameter of 457.2 mm and a wall thickness of 19.0 mm by roll-forming a strip having a steel composition equivalent to JIS STPL380 into an open tubular shape by a break-down roll forming mill and electrowelding the seam. The present invention was applied to. The current condition of the welding machine was 300 kHz × 700 kW, and a contact tip was used as a power supply means for joint heating. The welding speed (pipe making speed) was 12 m / min. The internal bead was cut using a fixed bite, and the generated continuous belt-shaped internal bead cutting waste 15 was processed in the form shown in FIG. 3 (however, contact chips were used instead of the work coil 6). The upstream bending roller 21 is made of Si ₃ N ₄ and has a diameter of 65 mm × body length 200 mm × 1 and a diameter 30 mm × body length 200 mm × 2 pieces. The belt conveyor 23 is made of SUS316, and is arranged in two upper and lower stages. As shown in FIG. 5, the belt was provided with irregularities, and the gap size between the upper and lower belts through which the continuous belt-shaped inner surface bead cutting chips 15 were passed was 3.2 mm high × 100 mm wide. The upward bending roller 22 is made of Si ₃ N ₄ and has a diameter of 40 mm × body length of 200 mm × 2 pieces. The winder 24 employs a winder system to which rotation drive control is added using a 2 kW motor.

  As a result, the continuous belt-shaped inner surface bead cutting waste can be smoothly transferred to the upstream side, discharged outside the pipe and wound up, and the conventional bead blowing step on the downstream side can be omitted.

A strip having a steel composition equivalent to JIS STKM13B is roll-formed into an open tubular shape by a cage roll forming mill (see FIG. 1), and the seam is electro-welded and welded to form an electric-welded tube having an outer diameter of 89.1 mm and a wall thickness of 6.0 mm. The present invention was applied to the process of manufacturing. The current condition of the welding machine was 350 kHz × 450 kW, and a work coil was used as the power supply means for joint heating. The welding speed (pipe making speed) was 40 m / min. The internal bead was cut using a rotary tool, and the generated short chip-shaped internal bead cutting waste 17 was processed in the form shown in FIG. The hopper 26 was made of Si ₃ N ₄ . The suction tube 25 was made of Si ₃ N ₄ , and the cross-sectional size was 4.5 mm long axis × 20 mm short diameter × 2.3 mm thick. The suction device 27 was provided with a 3 kW suction machine and a 200 m ³ cutting waste storage.

  Thereby, the short chip-shaped inner surface bead cutting waste can be smoothly transferred to the upstream side and discharged / collected outside the pipe, and the downstream side bead blowing step that has been conventionally performed can be omitted.

It is a schematic diagram which shows an example of the pipe making line which employ | adopts the conventional inner surface bead cutting waste processing method. It is a schematic diagram which shows an example of the conventional inner surface bead cutting waste processing method. It is a schematic diagram which shows an example of embodiment which processes the continuous belt-shaped inner surface bead cutting waste by this invention. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is a schematic diagram which shows an example of embodiment which processes a short chip-shaped inner surface bead cutting waste by this invention. It is CC arrow line view of FIG. It is the DD arrow line view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Payoff reel 2 Edge bend roll 3 Cage roll group 4 Center bend roll group 5 Fin pass roll group 6 Work coil 7 Squeeze roll 8 External bead cutting bit 9 Internal bead cutting bit (fixed bit)
9A Internal bead cutting tool (Rotary tool, Rotary tool)
-Inner bar-Inner tool holder-Cutting dust through hole-Pipe making direction (pipe feed direction)
14 External bead cutting waste
15 Internal bead cutting waste (continuous strip)
・ Leveler ・ Internal bead cutting waste (short chip shape)
・ Strip
21,22 Bending roller ・ Belt conveyor ・ Winding device ・ Suction tube ・ Hopper ・ Suction device ・ Open tube ・ Seam
40 pipes (ERW pipe)

Claims (3)

  Inner surface bead formed at seam of seam pipe is cut, inner surface bead cutting waste generated by the cutting is transferred to the upstream side in the pipe forming direction, and discharged to the outside of the pipe Bead cutting waste disposal method.   2. The electric resistance welded tube according to claim 1, wherein the continuous belt-shaped inner surface bead cutting waste generated by the cutting is transferred to the upstream side in the pipe forming direction using a guide mechanism, and discharged after being discharged out of the pipe. Of processing inner surface bead cutting waste.   2. The inner surface of an electric resistance welded tube according to claim 1, wherein short chip-shaped inner surface bead cutting waste generated by the cutting is sucked to be transferred to the upstream side in the tube forming direction and discharged outside the tube. Bead cutting waste disposal method.

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