JP2009039731A - Method and apparatus for manufacturing electric resistance welded tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing electric resistance welded tubes by which the electric resistance welded tubes having a required length are obtained while being transferred by small-scale equipment, and also production of chips and burrs can be reduced. <P>SOLUTION: Dividing grooves recessing a strip-like steel sheet 2 over the width direction are formed at required length intervals and the electric resistance welded tubes 9 after welding are cut by shifting the axis in the direction vertical to the axis before and behind the dividing grooves. The dividing groove has an approximately V-shaped cross section and the depth is taken as (the thickness of the steel sheet×0.8 to 0.9). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for manufacturing an electric resistance welded tube.

Conventionally, while pulling a steel sheet wound in a coil shape from an uncoiler, it is formed into a cylindrical shape by a roll forming device, and its seam is welded by a welding device and then cut by a required length. The manufacturing method and manufacturing technology are known (see Patent Document 1).
Further, as the electric sewing tube cutting device, a so-called traveling cutting device that cuts the electric sewing tube while moving a traveling carriage having a circular saw-shaped electric cutter in synchronization with the transfer of the electric sewing tube is adopted (patent) References 2-4).
JP 2000-301232 A JP 2001-205516 A Japanese Patent Laid-Open No. 2003-326312 Japanese Patent Laid-Open No. 2004-136407

However, in the conventional invention, the electric sewing tube cannot be instantaneously cut with a rotating electric cutter or a cutter moving in the direction of the axis, so a heavy object (about 300 to 600 kg) carrying the electric cutter is used. There is a problem in that it is necessary to move a traveling carriage in synchronization with the transfer of the ERW pipe, and a large-scale equipment is required.
In addition, when the electric sewing tube is cut, there is a problem that a large amount of burrs are generated on chips and cut surfaces by the cutting blade.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an ERW tube having a required length with a small-scale equipment while transferring the ERW tube. It is providing the manufacturing method and manufacturing apparatus of an electric resistance welded tube which can suppress generation | occurrence | production of a chip and a burr | flash at the same time.

  In the invention according to claim 1 of the present invention, an electric sewing tube which is formed into a cylindrical shape by a roll forming device while pulling out a belt-shaped steel plate, welds its seam, and then cuts to a required length. In the manufacturing method, a groove forming step of forming split grooves recessed in the width direction in the strip-shaped steel plate at the required length interval, and the welded electric sewing pipe in a straight axis before and after the split grooves. It is characterized by comprising a cutting step of cutting with the axis shifted in the direction.

  According to a second aspect of the present invention, there is provided an electric-welded pipe manufactured by pulling a strip-shaped steel sheet and forming it into a cylindrical shape by a roll forming device, and welding the seam and then cutting it to a required length. In the apparatus, a groove forming device that forms the divided grooves recessed in the width direction in the belt-shaped steel plate at the required length interval, and the welded electric sewing tube in the axial direction before and after the divided grooves And a cutting device that cuts the shaft by shifting its axis.

  In the present invention, as described above, split grooves recessed in the width direction in the strip-shaped steel plate are formed at a predetermined length interval, and the welded ERW pipe is placed in the direction perpendicular to the axis before and after the split grooves. By cutting off the axis, it is possible to obtain the ERW tube of the required length with a small-scale equipment while transporting the ERW tube, and at the same time, suppressing the generation of chips and burrs. it can.

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1 will be described below.
FIG. 1 is a view showing a production line of a production apparatus for an ERW pipe according to a first embodiment, FIGS. 2 to 4 are views for explaining the operation of the groove forming apparatus according to the first embodiment, and FIGS. 3 to 5 are cutting apparatuses according to the first embodiment. It is a figure explaining the action | operation of.

First, the manufacturing line of the electric sewing tube manufacturing apparatus according to the first embodiment will be described.
As shown in FIG. 1, the production line of the ERW pipe manufacturing apparatus of Example 1 includes a sending process, a groove forming process, a roll forming process, a welding process, a bead cutting process, a cooling process, and a cutting process. Process.

In the feeding process, the strip-shaped steel plate 2 wound around the uncoiler 1 is continuously drawn out downstream using the feeding device 3 and is flattened using the leveler 4.
Although a specific configuration of the feeding device 3 can be set as appropriate, in the first embodiment, the pair of feeding rollers 3a connected to a motor (not shown) rotates while abutting against both end portions in the width direction of the steel plate 2, thereby the steel plate 2 Is pushed out and sent out downstream.
The leveler 4 is configured to flatten the steel plate 2 by sliding a plurality of rotating rollers 4 a alternately on the upper and lower surfaces of the steel plate 2.

  In the groove forming step, the divided grooves 6 are formed using a groove forming apparatus 5 described later.

In the roll forming step, the strip-shaped steel plate 2 is formed into a cylindrical shape using the roll forming apparatus 7.
The specific configuration of the roll forming device 7 can be set as appropriate. In Example 1, the edge roller group 7a restrains and supports the lower portion of the strip-shaped steel plate 2, and the end in the width direction is bent and formed inside. While the lower and end portions in the width direction are restrained and supported by the roll group 7b, the center in the width direction is gradually bent inward by the center roll group 7c to be bent into a substantially U-shaped cross section.
Thereafter, the side roll group 7d and the fin pass roll group 7e are formed in a cylindrical shape as a shape in which both edges in the width direction of the steel plate 2 having a substantially U-shaped cross section are butted together.

  In the welding process, the seam of the tubular steel plate 2 is welded by using a welding device 8 such as an arc welding device to form the ERW tube 9.

  In the bead cutting process, excess weld lines generated on the inner and outer surfaces of the seam of the ERW pipe 9 are cut and removed using a known trimmer device 10 or the like.

In the cooling step, a low temperature gas (air) or liquid (water) is applied to the weld line of the ERW tube 9 to cool to room temperature.
In addition, the process order of a bead cutting process and a cooling process may be replaced, and may be abbreviate | omitted depending on the case.

In the cutting step, the electric sewing tube 9 is cut using a cutting device 11 described later.
The cut ERW tube 9 is transported to the downstream side using the roller table 12 or the like, and then accommodated in a bucket or the like (not shown).

  Further, a contact roller type measuring device 13 for continuously measuring the traveling length and traveling speed of the steel plate 2 is provided between the feeding device 3 and the groove forming device 5, and in an appropriate part of the production line. A guide roller 14 is provided for restraining and supporting the end of the electric sewing tube 9 in the width direction.

  Furthermore, a main controller 15 using a servo controller and a programmable controller is provided as control means for at least the feeding device 3, the groove forming device 5, the measuring device 13, the welding device 8, and the cutting device 11.

Next, the groove forming apparatus 5 will be described.
As shown in FIG. 2, the groove forming device 5 includes a lower mold 5 a that supports the steel plate 2 that travels downstream on a flat upper surface, and an upper mold 5 b that is spaced apart above. .
The upper die 5b is provided with a pressing portion 5c having a width wider than that of the steel plate 2 and a tip tapered in a substantially V shape at the lower portion thereof, and a piston rod 5d of an actuator (not shown) that can be expanded and contracted in the vertical direction is connected to the upper portion thereof. ing.

As shown in FIGS. 2 to 4, when the actuator is actuated by a command from the main control device 15, the upper die 5 b temporarily moves up and down by a predetermined dimension due to the expansion and contraction of the piston rod 5 d, whereby the pressing portion 5 c is moved. A part of the upper surface of the steel plate 2 is recessed to form the dividing groove 6.
At this time, a part of the upper surface of the steel plate 2 is pressed by the pressing portion 5c to form the dividing groove 6, so that chips and burrs are not generated.
Further, the time required for the lower mold 5a to form the dividing groove 6 is instantaneous, and FIGS. 2 and 4 show the pressing portion 5c away from the steel plate 2 for convenience of illustration. Both are arranged as close as possible.
Moreover, although the shape and depth of the dividing groove 6 can be set as appropriate, in the first embodiment, as shown in FIG. 3, the dividing groove 6 has a V-shaped cross section, and the depth D1 is a plate thickness D2 × 0.8 to It is set to 0.9. The angle θ formed by the V-shape can be set as appropriate.

  The structure for moving the pressing portion 5c up and down can be set as appropriate. For example, the pressing portion 5c may be provided on a disc-shaped eccentric cam that is eccentrically connected to the rotating shaft of the motor and moved up and down. Any configuration may be used as long as the pressing portion 5c can be moved up and down with high accuracy.

Next, the cutting device 11 will be described.
As shown in FIG. 5, the cutting device 11 is configured by front and rear dies 11 a and 11 b having substantially rectangular shapes, which are arranged at the front and rear in a state where the electric sewing tube 9 that travels downstream is penetrated.
The front mold 11a is formed with a through hole 11c for restraining and supporting while sliding on the outer periphery of the electric sewing tube 9 running downstream in the center, and the lower part thereof is fixed to a base (not shown). .
The rear mold 11b is formed with a through hole 11d that is supported on the outer periphery of the electric sewing tube 9 that runs downstream in the center of the rear mold 11b. It is connected to the rod 11e.
In addition, a predetermined gap W1 is formed between the front die 11a and the rear die 11b, and a tapered enlarged diameter portion 11f is formed at the upstream opening end of the rear die through hole 11d. ing. The value of the predetermined gap W1 can be set as appropriate.

As shown in FIGS. 5 and 6, when the split groove 6 of the electric sewing tube 9 passes between the front and rear molds 11a and 11b, when the actuator is actuated by a command from the main controller 15, the expansion and contraction of the piston rod 11e is performed. As a result, the rear mold 11b is temporarily moved up and down by a predetermined dimension, whereby the electric sewing tube 9 is axially displaced in the axial direction before and after the dividing groove 6 and cut.
At this time, the ERW pipe 9 is cracked and sheared at the V-shaped intersection of the dividing groove 6 due to the shaft misalignment, so that chips and burrs are generated compared to cutting with a circular saw-shaped electric cutter. Therefore, a good cut surface can be formed without deformation.

Further, as shown in FIG. 7, after the rear mold 11 b returns to the original position, the downstream end 9 a of the cut downstream electric sewing tube 9 becomes the upstream end of the upstream electric sewing tube 9. The vehicle travels while pushing 9b to the downstream side.
At this time, the diameter-enlarged portion 11f of the through hole 11d of the rear die 11b does not cause the downstream end 9a of the cut electric sewing tube 9 to be caught by the rear die 11b, and the insertion property into the through hole 11d is improved. ing.

Further, the time required for cutting the electric sewing tube 9 is instantaneous.
As described above, the vicinity of the dividing groove 6 of the ERW tube 9 is connected by a thickness of 0.1 to 0.2, so that when the thickness is 1.0 to 2.0 mm, If the moving distance of the mold 11b is 0.1 to 0.2 mm, the electric sewing tube 9 can be cut.
However, in the first embodiment, the electric sewing tube 9 is cut with its axis shifted in the vertical direction, and therefore, both ends of the width direction perpendicular to the axis deviation direction that is hard to cut and the material on the outer periphery of the dividing groove 6 and the material. In consideration of the above characteristics, the electric sewing tube 9 can be reliably cut by setting the moving distance to be larger than about 0.1 to 0.2 mm and about twice as long.
In FIGS. 5 and 6, the rear mold 11b is largely moved for the sake of illustration, but in actuality it is slight.

  Therefore, in the first embodiment, the electric sewing tube 9 can be accurately cut in a short time to the required length without stopping the running of the electric sewing tube 9 by moving the rear mold 11b slightly up and down.

Next, the operation control of each device by the main control device 15 will be described.
In the feeding process, the main control device 15 operates the feeding device 3 to feed the steel plate 2 from the uncoiler 1 to the downstream side, and at the same time, according to the travel length / travel distance of the steel plate 2 measured by the measuring device 13. By operating the groove forming device 5, the divided grooves 6 are formed in the steel plate 2 at intervals of a predetermined length previously input and stored in the main control device 15.
Further, the main control device 15 monitors the position of the dividing groove 6 based on the measurement value of the measurement device 13.

  In the cutting step, the main control device 15 operates the cutting device 11 to cut the electric sewing tube 9 when the dividing groove 6 of the electric sewing tube 9 passes between the front and rear molds 11a and 11b.

Accordingly, the main control device 15 can easily change the traveling speed of the steel plate 2 (electric sewing tube 9) in order to control the operation of the feeding device 3, and in some cases, temporarily travel of the steel plate 2 (electric sewing tube 9). It is also possible to stop automatically.
In addition, the electric sewing tube 9 having the required length can be continuously formed simply by changing the dimension value of the required length of the electric sewing tube 9 input and stored in the main control device 15.
Alternatively, it is also possible to continuously form ERW tubes 9 of various lengths one after another while flowing the material. In that case, the process which measures the length of the ERW pipe 9 in the downstream process and stores it sequentially in each bucket, conveyor, etc. according to length is provided.

Here, in the conventional invention, since the electric sewing tube cannot be instantaneously cut by the electric cutter, the traveling carriage which is a heavy object (about 300 to 600 kg) carrying the electric cutter is transferred to the electric sewing tube. There is a problem that a large-scale equipment is required because it is necessary to move them in synchronization with each other.
In addition, there is a problem that a large amount of chips and burrs are generated when the electric sewing tube is cut.

  On the other hand, in the first embodiment, as described above, the cutting device 11 can instantaneously cut the electric sewing tube 9 by shearing. Therefore, a large-scale equipment is not required as compared with the conventional invention, and a small-scale equipment is provided. Therefore, it can be implemented and contributes to power saving.

  Further, in the groove forming step and the cutting step, chips and burrs are not generated, and the cut surface of the ERW tube 9 can be made favorable.

Next, the effect will be described.
As described above, in the method and the apparatus for manufacturing the electric sewn tube 9 according to the first embodiment, the dividing groove 6 that is recessed in the width direction in the strip-shaped steel plate 2 drawn from the uncoiler 1 is required. By forming the welded ERW tube 9 by shifting the axis of the welded ERW 9 before and after the dividing groove 6 in the axial direction, and moving the ERW tube 9 with a small-scale equipment. The ERW tube 9 having a required length can be obtained, and at the same time, generation of chips and burrs can be suppressed.

  Moreover, since the dividing groove 6 has a substantially V-shaped cross section, it can be broken by generating a crack from the intersection of the V-shape, and the electric sewing tube 9 can be cut with a small stress, and a good cut surface can be formed.

  Moreover, since the depth of the dividing groove 6 is set to the plate thickness of the steel plate 2 × 0.8 to 0.9, it can sufficiently withstand the processing force of the roll forming device 7 without breaking, and at the same time easy cutting by the cutting device 11. Is possible and is preferable.

  Further, the cutting device 11 is constituted by a front mold 11a and a rear mold 11b that can be restrained and supported while the electric sewing tube 9 is penetrated, and the dividing groove 6 of the electric sewing tube 9 has a front mold 11a and a rear mold 11b. When passing, the rear mold 11b is temporarily moved in the axial direction to press the electric sewing tube 9, thereby causing the electric sewing tube 9 to be axially displaced in the axial direction before and after the dividing groove 6. Therefore, the electric sewing tube 9 can be cut instantaneously with simple equipment.

Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.
For example, in the first embodiment, the front and rear molds 11a and 11b are restrained and supported while sliding on the outer periphery of the electric sewing tube 9, but at least the front and rear molds 11a and 11b are attached to the electric sewing tube 9. Any one or both of the front and rear molds 11a and 11b may be moved in the direction perpendicular to the axis in contact with the opposing parts of the outer periphery.

Further, as shown in FIGS. 8 to 10, the through hole 11d of the rear mold 11b is formed in a semi-cylindrical shape opened downward, and after the electric sewing tube 9 is cut, it is dropped downward and sequentially placed on a bucket or a conveyor (not shown). You may make it accommodate.
In the first embodiment, the dividing groove 6 is provided on the inner peripheral side of the electric sewing tube 9, but may be provided on the outer peripheral side or on both sides of the inner and outer peripheral sides.
Further, a sensor (for example, an X-ray survey device or an ultrasonic survey device) that detects the position of the dividing groove 6 is installed between the front and rear molds 11a and 11b, and the main control device 15 is based on the measurement value from this sensor. However, the cutting device 11 may be operated.

It is a figure which shows the manufacturing line of the manufacturing apparatus of the electric sewing pipe of Example 1. FIG. It is a figure explaining the action | operation of the groove forming apparatus of Example 1. FIG. It is a figure explaining the action | operation of the groove forming apparatus of Example 1. FIG. It is a figure explaining the action | operation of the groove forming apparatus of Example 1. FIG. It is a figure explaining the action | operation of the cutting device of Example 1. FIG. It is a figure explaining the action | operation of the cutting device of Example 1. FIG. It is a figure explaining the action | operation of the cutting device of Example 1. FIG. It is a figure explaining the action | operation of the cutting device of another Example. It is a figure explaining the action | operation of the cutting device of another Example. It is a figure explaining the action | operation of the cutting device of another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Uncoiler 2 Steel plate 3 Feeder 3a Roller 4 Leveler 4a Rotating roller 5 Groove forming device 5a Lower die 5b Upper die 5c Pressing part 5d Piston rod 6 Dividing groove 7 Roll forming device 7a Edge roller group 7b Cage roll group 7c Center roll group 7d Side roll group 7e Fin pass roll group 8 Welding device 9 Electric welded tube 9a Downstream end portion 9b Upstream end portion 10 Trimmer device 11 Cutting device 11a Front mold 11b Rear mold 11c, 11d Through hole 11e Piston rod 11f Expanded diameter section 12 Roller table 13 Measuring device 14 Guide roller 15 Main control device

Claims (5)

In the method for producing an electric resistance welded tube, the belt-shaped steel sheet is drawn out, formed into a cylindrical shape by a roll forming device, and welded at its seam, and then cut at a required length.
A groove forming step of forming the divided grooves recessed in the width direction in the belt-shaped steel plate at the required length interval;
A method for manufacturing an electric resistance welded tube, comprising: a cutting step in which the welded electric resistance welded tube is axially displaced in the axial direction before and after the dividing groove. While pulling out a strip-shaped steel sheet, it is formed into a cylindrical shape by a roll forming device, and after welding its seam, it is cut at a required length in an electric sewing tube manufacturing apparatus,
A groove forming apparatus for forming the divided grooves recessed in the width direction in the belt-shaped steel plate at the required length interval;
An apparatus for manufacturing an electric resistance welded pipe, comprising: a cutting device that cuts the welded electric resistance welded pipe before and after the divided groove in a direction perpendicular to the axis. In the electric sewing tube manufacturing apparatus according to claim 2,
The electric sewing tube manufacturing apparatus according to claim 1, wherein the dividing groove has a substantially V-shaped cross section. In the electric sewing pipe manufacturing apparatus according to claim 2 or 3,
The depth of the said division | segmentation groove | channel was made into the board thickness x0.8-0.9 of the steel plate, The manufacturing apparatus of the ERW pipe characterized by the above-mentioned. In the electric sewing tube manufacturing apparatus according to any one of claims 2 to 4,
The cutting device is composed of a front mold and a rear mold that can be restrained and supported in a state where the electric sewing tube is penetrated,
When the split groove of the electric sewing tube passes between the front mold and the rear mold, the electric sewing pipe is pressed by temporarily moving at least one of the front and rear molds in the axial direction. An apparatus for manufacturing an electric resistance welded tube, characterized in that the sewing tube is cut while being axially displaced in the axial direction before and after the dividing groove.

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