JP2006247680A - Method, equipment and operation process for profile cutting of steel pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method, equipment and an operation process for profile cutting of a steel pipe, wherein a prescribed machining can be efficiently performed through a comparatively simple structure. <P>SOLUTION: A steel pipe P to be cut is rotatably held by a rotary holder 1, with a guide mechanism 3 engaged to a spiral profiling model 2 installed on the outer circumferential face of the steel pipe P. A torch 4 is mounted on a proper place of the guide mechanism 3, with the steel pipe P rotated around its rotary shaft 5. As a result, the nozzle of the torch 4 relatively moves spirally along the outer circumferential face of the steel pipe P through the guide mechanism 3. Thus, the end of the steel pipe P is spirally cut off. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention typically relates to a method and apparatus for cutting an end of a steel pipe in a spiral shape, and further relates to a method for copying and copying a steel pipe.

  In recent years, steel pipe piles have been used in fields such as construction and civil engineering. This steel pipe pile is provided with a spiral accessory at the lower end of a steel pipe buried in the ground, and is rotationally pressed into the ground by a construction machine. Such a steel pipe pile has features such that it can be carried out without vibration, no noise, and no soil during construction.

  In order to attach and fix the spiral accessory by welding or the like, the end of the steel pipe is cut into a spiral shape. Conventionally, when the end portion of the steel pipe is cut in such a manner, a spiral marking is inserted into the end portion of the steel pipe, and the cutting torch is moved manually along the marking line.

  Conventionally, various methods or apparatuses for cutting steel pipes have been devised. For example, in Patent Document 1, a leg plate that can be press-contacted to the inner surface of a steel pipe is attached to the main body so as to be extendable and retractable. A revolving body that rotates at a predetermined speed and about the center axis of the steel pipe or the vicinity thereof is provided by a drive mechanism, and this revolving body is provided with a slide rod provided with a copying roller that always rolls in contact with the inner surface of the steel pipe at the lower end. There is disclosed a gas groove cutting machine that is provided with a cutting torch that is provided with a crater on the same axis as the axis of the copying roller at the lower end of the slide rod.

  Further, Patent Document 2 discloses a milling device including a cutter that performs cutting and groove processing while following the outer peripheral surface of a pipe, a rotary drive device that drives the cutter, and an outer peripheral surface of a steel pipe disposed before and after the cutter. A steel pipe cutting device is disclosed which comprises a copying apparatus and a traveling carriage that can be synchronized with the progress of the steel pipe being formed during cutting. Furthermore, Patent Document 3 discloses a steel pipe spiral fusing device.

Japanese Utility Model Publication No. 55-103066 JP-A-8-309609 JP 2002-35931 A

  However, in manufacturing the above-described steel pipe pile, when the end of the steel pipe is cut into a spiral shape, the work is basically performed manually, and considerable labor and labor are required. Also, since the steel pipes handled are large and heavy, it is necessary to pay full attention to ensuring work safety.

  In addition, what is described in Patent Document 1 or Patent Document 2 is only as far as a specific steel pipe cutting method is concerned, and basically, this type of steel pipe pile processing, in particular, spiral attachments are attached and fixed. It is not intended for cutting of the end of the steel pipe for the purpose. In addition, the devices described in these documents have a very large and complicated structure, which requires a great deal of cost. Further, the device described in Patent Document 3 is a mechanically and electrically large and complicated device.

  In view of such circumstances, an object of the present invention is to provide a steel pipe copying / cutting method and apparatus and a steel pipe copying / cutting operation method capable of efficiently performing a predetermined processing with a relatively simple structure.

  The steel pipe copying and cutting method of the present invention is a method for cutting an end portion of a steel pipe in a spiral shape, and rotatably supports the steel pipe to be cut and is attached to the outer peripheral surface of the steel pipe. The guide mechanism is engaged with the model, and a torch is mounted at an appropriate position of the guide mechanism, and the steel pipe is rotated around its rotation axis so that the crater of the torch is connected to the outer periphery of the steel pipe via the guide mechanism. It is characterized by relative movement in a spiral shape along the surface.

  Further, in the steel pipe copying and cutting method of the present invention, a guide roller of the guide mechanism engages with the copying model, and a slider on which the guide roller and the torch are mounted by rotation of the steel pipe is near the outer peripheral surface side of the steel pipe. It is characterized by sliding in the direction of the rotation axis.

  The steel pipe copying and cutting device of the present invention is a device for cutting an end portion of a steel pipe in a spiral shape, and is attached to a rotation support device that rotatably supports the steel pipe to be cut, and an outer peripheral surface of the steel pipe. A spiral copying model and a guide mechanism that engages with the copying model and slides the torch mounted at a proper position in the direction of the rotation axis near the outer peripheral surface of the steel pipe.

  In the steel pipe copying and cutting apparatus according to the present invention, the guide mechanism includes a guide roller that engages with the copying model, and a slider that mounts the guide roller and the torch and slides in the direction of the rotation axis near the outer peripheral surface of the steel pipe. It is characterized by including.

  In the steel pipe copying and cutting apparatus according to the present invention, the guide mechanism is configured to be capable of adjusting a position of the torch with respect to the steel pipe according to a diameter of the steel pipe.

  Further, the steel pipe copying and cutting work method of the present invention is a working method for cutting the end of a steel pipe in a spiral shape, and uses the steel pipe copying and cutting apparatus to rotate the steel pipe around its rotation axis. Thus, the crater of the torch is relatively moved spirally along the outer peripheral surface of the steel pipe through the guide mechanism.

  According to the present invention, by rotating the steel pipe, the crater of the torch is relatively moved along the outer peripheral surface of the steel pipe through the guide mechanism in accordance with the shape of the copying model, thereby automatically moving the end of the steel pipe. Can be cut into a spiral. The end of the steel pipe can be cut into a predetermined shape efficiently and accurately, and the cost can be substantially reduced because the configuration is relatively simple.

DESCRIPTION OF EXEMPLARY EMBODIMENTS A preferred embodiment of a steel pipe copying and cutting method and apparatus and a steel pipe copying and cutting method according to the present invention will be described below with reference to the drawings.
1 and 2 show a schematic configuration of a steel pipe copying and cutting apparatus according to this embodiment. The steel pipe copying and cutting apparatus of the present invention cuts the end of the steel pipe P in a spiral shape, but the rotation support device 1 that rotatably supports the steel pipe P to be cut, and the spiral attached to the outer peripheral surface of the steel pipe P. And a guide mechanism 3 that engages with the copying model 2 and slides the torch 4 mounted at an appropriate position in the direction of the rotating shaft 5 in the vicinity of the outer peripheral surface side of the steel pipe P.

  Here, the steel pipe P (FIG. 3) cut by the apparatus of the present invention is attached with a spiral accessory (not shown) at the end, thereby producing a steel pipe product. The present invention is applicable to all sizes of the steel pipe P (and accessories).

  The rotation support device 1 includes four turning rollers 6 arranged to support the vicinity of the lower portion of the steel pipe P at, for example, four points as shown in FIG. Each turning roller 6 is electrically driven synchronously, thereby rotating the steel pipe P around the rotary shaft 5 almost horizontally.

  The copying model 2 is configured to wind the end portion of the steel pipe P, and as shown in FIGS. 5 and 6, an annular body arranged orthogonal to the rotating shaft 5 along the outer circumference of the steel pipe P. 7 and a spiral body 8 that is inclined at a predetermined angle with respect to the ring body 7 and is arranged in a spiral shape on the outer periphery of the steel pipe P. The spiral body 8 has a spiral structure that matches the spiral of the accessory, and has a length that circulates around the outer periphery of the steel pipe P by at least about one turn. Further, the spiral body 8 is formed in a so-called flange shape so as to rise vertically from the outer peripheral surface of the steel pipe P. The ring body 7 and the spiral body 8 are connected to each other by a plurality of reinforcing plates or ribs 9 to form an integral structure. A plurality of types of copying models 2 are manufactured according to the size (diameter) of the steel pipe P.

  The plurality of ribs 9A, 9B, 9C arranged at appropriate intervals along the outer circumference of the steel pipe P are each provided with two screw portions 10, for example, and each screw portion 10 has a fixing bolt ( (Not shown) is screwed. By screwing the fixing bolt into the screw portion 10, a binding force is generated, and the copying model 2 can be fixed to the steel pipe P. Note that a nut may be welded as the screw portion 10.

  7 and 8 show a specific configuration of the steel pipe copying and cutting apparatus. In this embodiment, the carriage 12 is movable by a caster 11 so that the guide mechanism 3 can be moved and installed at a desired position or place. The carriage 12 is provided with a handle 13 and has a leveling pad 14. In actual use, after the carriage 12 is moved to a predetermined position, the level of the carriage 12 can be adjusted and fixed using the leveling pad 14.

  The carriage 12 is equipped with a lifter 15. The lifter 15 has, for example, a two-stage lifting mechanism 16 and is configured to be height adjustable. As shown in FIG. 7, for example, asbestos-made noren 17 may be hung down at least on the steel pipe P side of the lifter 15 as shown in FIG. 7. The guide mechanism 3 is mounted on the lifter 15 via the base frame 18.

  Accordingly, the height of the torch 4 mounted on the guide mechanism 3 can be freely adjusted according to the height H of the steel pipe P by driving the lifting mechanism 16 and moving the lifter 15 up and down. As described above, the steel pipe P has a plurality of sizes, but can effectively cope with these sizes (see also FIG. 2).

  A guide rail 19 arranged in parallel with the rotation shaft 5 of the steel pipe P is laid on the top of the base frame 18. The slider 20 is slidably engaged with the guide rail 19. Therefore, the slider 20 slides in the direction of the rotation axis 5 near the outer peripheral surface side of the steel pipe P. A guide roller 24 and a torch 4 are mounted via holders 22 and 23 in the vicinity of both ends of a support arm 21 mounted on the slider 20 in the direction of the guide rail 19. The guide roller 24 and the torch 4 are spaced apart by a predetermined distance, and move synchronously in the direction of the guide rail 19 via the slider 20 while maintaining the distance.

  As shown in FIG. 9, the pair of guide rollers 24 are arranged and supported in parallel and rotatably with each other by a bracket 25 extending from the holder 22 to the steel pipe P side. The copying model 2 (helical body 8) intervenes between the guide rollers 24, and both engage with each other. In this case, the interval or gap between the guide rollers 24 is set to be appropriately larger than the plate thickness of the spiral body 8. In this way, by setting the distance between the guide rollers 24 to be large, the copying model 2 can be easily and accurately engaged. On the other hand, after engaging with the copying model 2, the bracket 25 is inclined as shown in FIG. 9B, and the gap between the copying model 2 and the guide roller 24 is adjusted to be appropriately small. By adjusting the gap in this way, the copying accuracy of the guide roller 24 with respect to the copying model 2 can be improved.

  Further, as shown in FIG. 10, the torch 4 is supported by a bracket 26 extending from the holder 23 to the steel pipe P side. Connected to the torch 4 are hoses 27 and 28 for supplying oxygen and acetylene gas. In addition, when the steel pipe P needs a groove | channel, the torch 4 can also be arrange | positioned with a predetermined angle inclination with respect to the outer peripheral surface of the steel pipe P (refer FIG. 8 etc.).

  In the above configuration, when the end portion of the steel pipe P is cut in a spiral shape by the steel pipe copying and cutting apparatus of the present invention, the steel pipe P to be cut is placed on the turning roller 6 of the rotation support device 1 and the steel pipe P is rotated. Support as possible. Next, the copying model 2 is set on the outer peripheral surface of the end portion of the steel pipe P. In this case, a fixing bolt (for example, a wing screw 29 as shown in FIG. 11) is screwed into the screw portion 10 of the copying model 2, and the copying model 2 is fixed. The copying model 2 is set at a position where one end of the spiral body 8 is shifted from the end face of the steel pipe P in the direction of the rotation axis 5 by the distance between the torch 4 and the guide roller 24.

  Next, the carriage 12 is moved to engage the guide roller 24 with the model 2 (for example, one end of the spiral body 8). Thereby, the torch 4 is positioned on the end face of the steel pipe P, that is, in this example, the cutting process is started from the end face of the steel pipe P. In this state, the turning roller 6 of the rotation support device 1 is driven to rotate, whereby the steel pipe P is rotated on the rotation support device 1 and a cutting flame is injected from the tip of the torch 4.

  As the steel pipe P rotates, the guide roller 24 that engages with the spiral body 8 moves in the direction of the rotation axis 5 of the steel pipe P. By such movement of the guide roller 24, the slider 20 slides on the guide rail 19 in the direction of the rotation axis 5 near the outer peripheral surface side of the steel pipe P. As a result, the torch 4 mounted on the slider 20 also slides in the direction of the rotation axis 5. In this embodiment, the torch 4 is slid by the stroke S (see FIG. 8) while the steel pipe P is rotated approximately once.

  By the rotation of the steel pipe P and the sliding of the torch 4 as described above, the torch 4 moves relative to the outer peripheral surface of the steel pipe P in a spiral shape. As a result, the end of the steel pipe P is cut in a spiral shape as shown in FIG. The spiral cutting start point and the cutting end point can be cut by any method.

  After cutting the steel pipe P, the copying model 2 set at the end thereof is removed. The spiral accessory mentioned above is attached to the end of the steel pipe P cut into a spiral shape, thereby producing a steel pipe product.

  According to the shape of the copying model 2 by rotating the steel pipe P on the rotation support device 1 as described above, the crater of the torch 4 is relatively moved along the outer peripheral surface of the steel pipe P in a spiral manner through the guide mechanism 3. Thereby, the end of the steel pipe P can be cut automatically, efficiently and accurately in a spiral shape. In this case, since human hands are not substantially required, high safety of the worker is ensured.

As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
In the above-described embodiment, the example in which the cutting process is started from the end face of the steel pipe P has been described. However, the cutting process is performed from the position shifted from the end face of the steel pipe P toward the rotation axis 5 by the distance between the torch 4 and the guide roller 24. It is also possible to start.

It is a front view which shows schematic structure of the steel pipe copying cutting apparatus of this invention. It is each a side view which shows schematic structure of the steel pipe copying cutting apparatus of this invention. It is the side view and bottom view which show the example of the steel pipe pile concerning this invention. It is a top view which shows the whole structure of the steel pipe copying cutting apparatus of this invention. It is a figure which shows the copying model which concerns on this invention. FIG. 3 is a development view of a copying model according to the present invention. It is a side view which shows the specific structural example of the steel pipe copying cutting apparatus of this invention. It is the top view and front view which show the specific structural example of the steel pipe copying and cutting apparatus of this invention. It is the top view and front view which show the guide roller which concerns on this invention. It is a figure which shows the torch circumference which concerns on this invention. It is a perspective view which shows the steel pipe edge part periphery after a cutting | disconnection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotation support apparatus 2 Copy model 3 Guide mechanism 4 Torch 5 Rotating shaft 6 Turning roller 7 Ring body 8 Spiral body 11 Caster 12 Carriage 15 Lifter 19 Guide rail 20 Slider 24 Guide roller P Steel pipe

Claims (6)

A method for cutting an end of a steel pipe into a spiral shape,
A steel pipe to be cut is rotatably supported, and a guide mechanism is engaged with a spiral copying model attached to the outer peripheral surface of the steel pipe, and a torch is mounted at an appropriate position of the guide mechanism,
The steel pipe profiling is characterized in that the crater of the torch is moved relative to the outer periphery of the steel pipe in a spiral shape via the guide mechanism by rotating the steel pipe around its rotation axis. Method.   A guide roller of the guide mechanism is engaged with the copying model, and a slider on which the guide roller and the torch are mounted by the rotation of the steel pipe slides in the direction of the rotation axis near the outer peripheral surface side of the steel pipe. The steel pipe copying and cutting method according to claim 1. An apparatus for cutting an end of a steel pipe into a spiral shape,
A rotation support device for rotatably supporting a steel pipe to be cut;
A spiral copying model attached to the outer peripheral surface of the steel pipe;
A steel pipe copying and cutting apparatus comprising: a guide mechanism that engages with the copying model and slides a torch mounted at an appropriate position in the direction of the rotation axis near the outer peripheral surface of the steel pipe.   The guide mechanism includes a guide roller that engages with the copying model, and a slider that mounts the guide roller and the torch and slides in the direction of the rotation axis near the outer peripheral surface of the steel pipe. Item 4. A steel pipe copying and cutting apparatus according to item 3.   The steel pipe copying and cutting apparatus according to claim 3 or 4, wherein the guide mechanism is configured to be able to adjust a position of the torch with respect to the steel pipe according to a diameter of the steel pipe. A work method for cutting the end of a steel pipe in a spiral shape,
Using the steel pipe copying and cutting device according to any one of claims 3 to 5,
A steel pipe copying and cutting method, wherein the crater of the torch is relatively moved in a spiral shape along the outer peripheral surface of the steel pipe through a guide mechanism by rotating the steel pipe around its rotation axis.

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