JP2015003338A - Casing of pipe material correction device and pipe material correction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casing of a pipe material correction device and the pipe material correction device which can install a pipe material with a simple technique and can perform circularity correction of the pipe material.SOLUTION: A casing of a pipe material correction device includes: a casing main body 3 which is formed around an axis line P as the center, allows an inner circumferential surface 3a to be fitted to an outer surface Wa of a pipe material W in a region of one edge part Wt of the pipe material W and allows the pipe material W to be pressed by using the inner circumferential surface 3a as a circularity correction mold surface; and a detachable member 11 which is provided detachably on a groove part 10 depressed over the whole region in the direction of the axis line P toward the outside in the radial direction at a part in the circumferential direction of the inner circumferential surface 3a of the casing main body 3, is attached to the groove part 10 and has a contact surface 11c flush with the inner circumferential surface 3a of the casing main body 3 while the casing main body 3 is fitted to the pipe material W and coming into contact with the outer surface Wa of the pipe material W. Therein, the groove part 10 is formed in such a size that the outer surface Wa of the pipe material W on the edge part position of a major axis of an ellipse does not interfere in such a state that the detachable member 11 is detached and the cross-section orthogonal to the axial line P is flattened into a shape of the ellipse in the region of one edge part of the pipe material W.

Description

  The present invention relates to a casing used in a pipe material straightening device that corrects the roundness of a pipe material, and a pipe material straightening device including the casing.

  For example, for pipe materials used for pipelines and piles, it is necessary to ensure a sufficient roundness in order to suppress the occurrence of poor bonding during welding and mechanical joining.

  Patent Document 1 discloses a correction device that increases the roundness of a pipe material. In this apparatus, the roundness of the pipe material is corrected by pressing the pipe material from the inner surface with a roller and plastically deforming the inner peripheral surface of the ring-shaped casing attached to the outer peripheral surface of the pipe material. .

  By the way, when the roundness of the pipe material is corrected in this way, it is necessary to insert the pipe material into the casing and to remove the pipe material from the casing after the correction of the pipe material. Here, in the apparatus of Patent Literature 1, the casing divided into a plurality in the circumferential direction is employed to facilitate the attachment / detachment of the pipe material from the casing.

JP2012-223817A

  However, when a split-type casing as described in Patent Document 1 is used, a device for pressing the casing from the outer peripheral side is required, so that the entire correction device is enlarged. In addition, when the outer diameter of the pipe material is larger than the inner diameter of the casing, or when the pipe material sticks to the casing due to correction, it is not easy to pull out the pipe material. It is not described in Patent Document 1. Furthermore, a general method of attaching and detaching the pipe using the difference in thermal expansion coefficient between the casing and the pipe is also conceivable. However, in this case as well, a heating device and a cooling device are separately required, and the entire correction device becomes large and complicated. Furthermore, since a pipe is pressed against the casing, high rigidity is required, and an iron-based material is used as the material. Therefore, when the pipe material is a steel pipe, the pipe material cannot be attached or detached using the difference in thermal expansion coefficient.

  The present invention has been made in consideration of such circumstances, and includes a casing for a pipe material straightening device that can be installed by a simple method and can correct the roundness of the pipe material, and a pipe straightening device. The purpose is to provide.

In order to solve the above problems, the present invention employs the following means.
That is, the casing of the pipe straightening device according to the present invention is a casing used for a pipe straightening device for correcting roundness in at least a partial region in the axial direction of the pipe, and has an annular shape centering on the axis. A casing body in which an inner peripheral surface is fitted to an outer surface of the pipe material in the region, and the pipe member is pressed from the inner surface toward the radially outer side of the axis, with the inner peripheral surface serving as a roundness correcting mold surface; The casing body is detachably provided at a part of the inner peripheral surface in the circumferential direction of the casing body so as to be detachable over the entire region in the axial direction, and is attached to the groove part. And a detachable member having a contact surface that is flush with the inner peripheral surface of the casing body and contacts the outer surface of the tube material in a state where the tube material is fitted, and the groove portion includes In a state where the removal member is removed and the region in the pipe is pressed from the outside in the radial direction and the cross section perpendicular to the axis is deformed into an elliptical shape, the end of the major axis of the ellipse is The outer surface of the pipe is formed in a size that does not interfere.

  According to such a casing, in a state where the detachable member is removed from the groove portion of the casing body, the outer surface of the end portion of the long axis of the tube material flattened to have an elliptical cross section does not interfere with the groove portion. . Therefore, when the tube material is deformed flat so that the outer surface at the end of the long axis of the tube material is disposed in the groove portion, the tube material can be moved relative to the casing body in the axial direction. On the other hand, in a state where the detachable member is attached to the groove and the casing body and the pipe are fitted, the contact surface of the detachable member is flush with the inner peripheral surface of the casing body. For this reason, when the pipe material is pressed against the inner peripheral surface of the casing body as the roundness correction mold surface, the pipe material is also pressed against the contact surface of the detachable member, and this contact surface is also true of the pipe material. The function as a circularity correction mold surface can be exhibited.

  In the casing body, a pair of the groove portions may be formed at positions spaced apart from each other by 180 degrees around the axis.

  By forming the groove portion in this way, the outer surface of the tube material flattened to have an elliptical cross section can be obtained even if the pressing force of the tube material is reduced and the amount of flat deformation is reduced as compared with the case where only one groove portion is formed. Interference with the groove can be prevented. Therefore, the tube material can be moved relative to the casing body in the axial direction in a state where the detachable member is removed from the groove portion.

  Furthermore, the bottom surface of the groove portion is formed so as to be inclined from the inner side in the radial direction of the axis toward the other side from one side in the axial direction to the other side, and the detachable member is attached to the groove portion and the casing body and the You may have the inclined surface which contacts the said bottom face in the state fitted with the pipe material.

  Thus, when the detachable member is slightly formed in the axial direction when the detachable member is removed from the groove portion, the groove portion is formed to be inclined and the detachable member has an inclined surface that contacts the bottom surface of the groove portion. A gap is formed between the bottom surface of the groove and the inclined surface of the detachable member, and between the contact surface of the detachable member and the outer surface of the pipe member. For this reason, a detachable member can be easily removed from a groove part. Further, when attaching the detachable member to the groove portion, the detachable member can be pushed into the groove portion by sliding the inclined surface of the detachable member on the bottom surface of the groove portion. Furthermore, until the attachment / detachment member is completely attached, a gap is formed between the bottom surface of the groove and the inclined surface of the attachment / detachment member, and between the contact surface of the attachment / detachment member and the outer surface of the pipe member. The member can be easily attached to the groove.

  Further, a pipe material correcting device according to the present invention includes the casing, the moving device that supports the casing main body and relatively moves the casing main body coaxially with respect to the pipe material in the direction of the axis, and the pipe material. A flattening device for pressing and deforming flatly from the outside in the radial direction, and gripping the detachable member, and moving the detachable member relative to the casing body in the axial direction to attach / detach the groove A detachable member moving device that attaches and detaches a member, and a pressing device that presses the tubular material from the inner surface toward the radially outer side.

  According to such a tube material correcting device, the tube material is flattened into an elliptical cross section by the flat device while the detachable member is removed from the groove portion, and the outer surface at the end of the long axis of the tube material is in the groove portion. To be distributed. Thereby, it becomes possible to move the pipe material relative to the casing body in the axial direction by the moving device. On the other hand, when the detachable member is attached to the groove by the detachable member moving device and the casing main body and the pipe material are fitted, the contact surface of the detachable member is also true of the pipe material when the pipe material is pressed against the casing main body by the pressing device. The function as a circularity correction mold surface can be exhibited.

  According to the casing of the pipe material straightening device of claim 1, the groove is formed in the casing body and the detachable member that can be detached from the groove is provided, so that the pipe can be easily inserted into the casing and easily removed from the casing. The pipe material can be installed by a simple method as it can be extracted, and the roundness of the pipe material can be corrected.

  Further, according to the casing of the pipe material straightening device of the second aspect, the pipe material can be inserted into and removed from the casing with a small pressing force, and the apparatus required for flat deformation of the pipe material can be reduced in size.

  Further, according to the casing of the pipe material straightening device of the third aspect, the attachment and detachment of the detachable member can be facilitated, so that the insertion of the pipe material into the casing and the extraction from the casing can be further facilitated.

  According to the pipe material correcting device of the fourth aspect, the pipe material can be easily inserted into the casing and can be easily removed from the casing so that the pipe material can be installed by a simple method, and the roundness of the pipe material can be corrected.

1 is an overall side view of a pipe material correcting device according to an embodiment of the present invention. It is the whole figure which looked at the casing of the pipe material straightening device concerning the embodiment of the present invention from the direction of an axis. It is AA sectional drawing of Drawing 2 about a casing of a pipe material straightening device concerning an embodiment of the present invention, and shows the state where one detachable member was attached to a slot, and the other detachable member was removed from a slot. It is the figure which looked at the flat apparatus of the pipe material correction apparatus which concerns on embodiment of this invention from the axial direction. BRIEF DESCRIPTION OF THE DRAWINGS It is the whole side view which shows the mode of the attachment or detachment of the pipe material to a casing in time series about the pipe material correction apparatus which concerns on embodiment of this invention.

Hereinafter, with reference to FIG. 1 to FIG. 5, a pipe material correcting device 1 according to an embodiment of the present invention will be described.
The tube material correcting device 1 is a device that corrects the roundness of a tube material W such as a steel pipe formed around the axis P, and in this embodiment, as an example, when correcting the region of one end Wt of the tube material W. Will be described.
Here, the roundness means a difference between the maximum outer diameter and the minimum outer diameter in a cross section perpendicular to the axis P of the pipe material W. The smaller the roundness, the more the cross-sectional shape of the pipe material W becomes a perfect circle. Close to.

As shown in FIG. 1, the pipe material straightening device 1 includes a casing 2 that has an annular shape about an axis P. The casing 2 is supported by a moving device 5 and a detachable member moving device 7 which will be described later.
As shown in FIGS. 2 and 3, the casing 2 includes a casing main body 3 having an annular shape around the axis P, and an attaching / detaching member 11 attached to and detached from a groove portion 10 formed on the inner peripheral surface 3 a of the casing main body 3. It has.

  The casing body 3 has an inner diameter that is substantially the same as the outer diameter of the tube material W, and the inner peripheral surface 3 a can be fitted to the outer surface Wa of the one end Wt of the tube material W. The length of the casing body 3 in the direction of the axis P is such that it covers the outer surface Wa of the one end Wt of the pipe W.

  The casing body 3 is made of a metal such as steel and has sufficiently high rigidity compared to the pipe material W. Further, the inner peripheral surface 3a of the casing body 3 is formed in a perfect circle or a substantially perfect circle when viewed from the direction of the axis P.

  Further, the groove 10 is formed to be recessed from the inner peripheral surface 3 a of the casing body 3 toward the radially outer side of the axis P over the entire area in the axis P direction. Further, in this embodiment, a pair of the groove portions 10 is formed at positions spaced apart from each other by 180 degrees around the axis P.

  Further, in each of the pair of groove portions 10, the bottom surface 10a facing the radially inner side of the axis P is directed from the radially inner side to the outer side as it goes from one side (upper side in FIG. 3) of the axis P direction to the other side. And inclined.

  Further, in each of the pair of groove portions 10, a pair of side surfaces 10 b that connect the bottom surface 10 a and the inner peripheral surface 3 a of the casing body 3 are formed orthogonal to the bottom surface 10 a.

  The detachable member 11 is a block-shaped member that is detachably attached to the groove portion 10. In addition, the detachable member 11 has an inclined surface 11a that comes into contact with the bottom surface 10a of the groove 10 when the casing body 3 and the pipe material W are fitted to the groove 10 in a fitted state. That is, the detachable member 11 is formed in a wedge shape.

  Further, the detachable member 11 is connected orthogonally to the inclined surface 11a, and a pair of orthogonal surfaces 11b contacting the pair of side surfaces 10b of the groove 10 and the pair of orthogonal surfaces 11b are connected to each other, and the outer surface of the pipe W And a contact surface 11c in contact with Wa. The contact surface 11 c is formed to be flush with the inner peripheral surface 3 a of the casing body 3 and to be continuous with the inner peripheral surface 3 a when the detachable member 11 is attached to the groove portion 10.

  Further, the end of the detachable member 11 on the other side in the axis P direction (the lower side in FIG. 3) is in contact with the casing body 3 from the direction of the axis P with the detachable member 11 attached to the groove 10. A plate-like portion 12 is formed. That is, the plate-like portion 12 extends outward in the radial direction of the axis P from the inclined surface 11a.

  In the present embodiment, when the detachable member 11 is attached to the groove portion 10, the one end portion in the axis P direction of the detachable member 11 is formed to have a dimension protruding from the groove portion 10 in the axis P direction. .

  Here, the pipe material correcting device 1 holds the casing main body 3 and moves the casing 2 relative to the pipe material W, the flat device 4 for flatly deforming the pipe material W, and the detachable member 11. The detachable member moving device 7 to be moved and the pressing device 6 for pressing the inner peripheral surface 3a of the pipe material W are further provided.

  As shown in FIG. 1, the moving device 5 has wheels 5 a and can travel in the direction of the axis P while gripping the lower portion of the casing body 3. In the present embodiment, the axis P direction coincides with the horizontal direction.

  As shown in FIG.1 and FIG.4, the flat apparatus 4 presses the pipe material W from a radial direction outer side, and carries out elastic flat deformation. Specifically, a constraining ring 21 that is formed in an annular shape around the axis P and that is capable of clamping the pipe W from the outside in the radial direction of the axis P, and a jack that fixes the two constraining rings 21 together. 24.

  The restraining ring 21 is divided into upper and lower parts, and is composed of two members of an upper half 22 and a lower half 23 having substantially the same shape. Further, when the upper half 22 and the lower half 23 sandwich the pipe W, the inner diameter of the restraint ring 21 and the outer diameter of the pipe W are such that the outer peripheral surface Wa of the pipe W is in contact with the inner peripheral surface 21a of the restraint ring 21. Are substantially the same dimensions. Further, in the state where the pipe material W is sandwiched in this way, there is a gap S1 between the upper half portion 22 and the lower half portion 23, that is, between the divided upper surface 22a and the divided lower surface 23a which are the divided surfaces in the restraint ring 21. It is supposed to be formed.

  Further, in both the upper half 22 and the lower half 23, the inner diameter is increased in the vicinity of the circumferential position where the divided upper surface 22 a and the divided lower surface 23 a are formed, and when the restraining ring 21 restrains the pipe material W. A diameter-enlarged space S2 is formed between the outer surface Wa of the pipe material W and the restraining ring 21. More specifically, in the vicinity of the circumferential position where the divided upper surface 22a and the divided lower surface 23a are formed, the inner peripheral surface 21a of the restraining ring 21 extends incline in the tangential direction of the outer surface Wa of the pipe W, and these divided upper surfaces 22a is formed on an inclined surface connected to the divided lower surface 23a.

  The jack 24 is a hydraulic jack, a screw jack, or the like provided in a pair so as to vertically penetrate the upper half 22 and the lower half 23 on both sides in the vertical direction and the horizontal direction orthogonal to the axis P direction. More specifically, the split upper surface 22a and the split lower surface 23a are vertically attached to the restraining ring 21. The constraining ring 21 has a recess 22b that is recessed downward from the outer peripheral surface of the upper half 22 toward the divided upper surface 22a, and that is recessed upward from the outer peripheral surface of the lower half 23 toward the divided lower surface 23a. 23b is formed, and the end of the jack 24 is arranged inside the recesses 22b and 23b.

  The jack 24 tightens the restraining ring 21 so that the upper half 22 and the lower half 23 are close to each other in the vertical direction with the restraining ring 21 sandwiching the pipe material W.

  The detachable member moving device 7 is arranged on the other side in the axis P direction with respect to the casing 2 and grips the plate-like portion 12 of the detachable member 11. The detachable member moving device 7 is provided integrally with the moving device 5 and can be moved in the direction of the axis P by a wheel 5a. And it has a cylinder etc. which move the attachment / detachment member 11 relative to the casing body 3 in the direction of the axis P, and attaches / detaches the attachment / detachment member 11 to / from the groove portion 10.

  The pressing device 6 (see FIG. 5 (d)) is provided integrally with the moving device 5, contacts the inner surface Wb of the tube material W in a state where the tube material W is inserted into the casing body 3, and the inner surface Wb is radially outward. Press toward. That is, the pipe member W is pressed against the casing body 3 by using the inner peripheral surface 3a of the casing body 3 as a roundness correcting mold surface.

Next, with reference to FIG. 1 and FIG. 5, a procedure for correcting the pipe material W by the pipe material correcting device 1 will be described.
First, as shown in FIG. 1, the tube material W is clamped by the restraining ring 21 in the flat device 4. At this time, the pipe material W is supported by a support base (not shown) so that the direction of the axis P is positioned on a horizontal plane. The holding position of the restraining ring 21 is preferably a position spaced from the one end Wt of the pipe W by the same length as the diameter of the pipe W in the direction of the axis P.

  At this time, the moving device 5 is arranged such that the casing body 3 and the pipe material W are coaxially positioned, and the one end Wt of the pipe material W and the casing body 3 are separated from each other.

  From this state, first, as shown in FIG. 5A, the jack 24 of the flattening device 4 is operated so that the upper half 22 and the lower half 23 of the restraining ring 21 are close to each other in the vertical direction (in the figure). (See arrow) Tighten.

After that, as shown in FIG. 5B, the moving device 5 is moved so as to be close to the one end Wt of the tube material W, and the tube material W is inserted into the casing body 3. At this time, the pipe W is pressed by the flattening device 4 and elastically deformed so that a part thereof swells, and this swelled part is located in the enlarged diameter space S2 shown in FIG. The cross section to be deformed is elliptical. Then, the tube material W is inserted so that the outer surface Wa at the position of the end of the long axis of the ellipse is located in the groove 10.
Here, when the bulging part of the tube material W is positioned in the groove portion 10 in this way, the size of the groove portion 10 is determined so that the tube material W does not interfere with the groove portion 10, or the restraining ring by the jack 24. 21 tightening forces have been determined.

  Next, as shown in FIG. 5C, the tightening by the flat device 4 is released (see the arrow in the figure), and then the detachable member moving device 7 is moved to attach the detachable member 11 in the groove portion 10.

  And as shown in FIG.5 (d), the tubular material W is pressed from the inner side to the inner peripheral surface 3a of the casing main body 3 and the contact surface 11c of the detachable member 11 by the pressing device 6 to be plastically deformed, thereby correcting the roundness. To do.

  Next, as shown in FIG. 5 (e), the detachable member moving device 7 is operated so that the detachable member 11 is separated from the casing body 3, and the detachable member 11 is removed from the groove portion 10.

  Then, as shown in FIG. 5 (f), the tubular material W is pressed by the flattening device 4, and is flattened so that the cross section becomes an elliptical shape as in the case described in FIG. 5 (b).

  Finally, as shown in FIG. 5 (g), the moving device 5 is operated so that the tube material W and the casing body 3 are separated in the direction of the axis P, and the tube material W is extracted from the casing body 3, and the flattening device 4 Release the tightening of the pipe W.

  According to such a tube material correcting device 1, when the groove portion 10 is formed in the casing body 3, and the detachable member 11 is removed from the groove portion 10, the tube material W is flattened and deformed into an elliptical shape. The outer surface Wa at the end portion position of the long axis does not interfere with the groove portion 10.

  Therefore, the flattening device 4 deforms the tube material W so that the outer surface Wa at the end of the long axis of the tube material W is disposed in the groove portion 10, so that the moving device 5 can deform the casing body 3. The tube material W can be relatively moved in the direction of the axis P, the tube material W can be easily inserted into the casing body 3, and the tube material W can be easily extracted from the casing body 3.

  When the detachable member 11 is attached to the groove portion 10 with the casing body 3 and the pipe W being fitted, the contact surface 11c of the detachable member 11 is flush with the inner peripheral surface 3a of the casing body 3. For this reason, when the pipe member W is inserted into the casing body 3 and the pressing device 6 is operated in a state where the detachable member 11 is attached to the groove portion 10, the pipe member W is pressed against the inner peripheral surface 3a of the casing body 3, The tube material W is also pressed against the contact surface 11 c of the detachable member 11. That is, even if the groove portion 10 is formed in the casing body 3, by attaching the detachable member 11, the contact surface 11 c of the detachable member 11 can also function as a roundness correcting mold surface of the tube material W. W correction becomes possible.

  Moreover, since the groove part 10 is formed in a pair, the amount of flat deformation of the tube material W can be reduced as compared with the case where only one groove part 10 is formed, and the flattening device 4 can be reduced in size and cost.

  Furthermore, since the detachable member 11 has the inclined surface 11a corresponding to the bottom surface 10a of the groove portion 10, when the detachable member 11 is removed, the detachable member 11 is slightly moved in the axis P direction by the detachable member moving device 7. A gap is formed between the bottom surface 10 a of the groove 10 and the inclined surface 11 a of the detachable member 11, and between the contact surface 11 c of the detachable member 11 and the outer surface Wa of the pipe W. For this reason, the detachable member 11 can be easily removed.

  Further, when attaching the detachable member 11, the detachable member 11 can be pushed into the groove portion 10 such that the inclined surface 11 a of the detachable member 11 slides on the bottom surface 10 a of the groove portion 10.

Furthermore, until the detachable member 11 is completely attached to the groove portion 10, it is between the bottom surface 10 a of the groove portion 10 and the inclined surface 11 a of the detachable member 11, and between the contact surface 11 c of the detachable member 11 and the outer surface Wa of the pipe W. Since a gap is formed, the attachment / detachment member 11 can be easily attached.
In this way, the attachment and detachment of the detachable member 11 can be facilitated, whereby insertion and extraction of the pipe material W from the casing body 3 can be further facilitated.

  According to the pipe material straightening device 1 of the present embodiment, the groove portion 10 is formed in the casing main body 3, and the detachable member 11 can be attached to and detached from the groove portion 10, so that the pipe material W can be inserted into and removed from the casing 2 by a simple method. This makes it possible to correct the roundness of the tube material W.

Although the embodiment of the present invention has been described in detail above, some design changes can be made without departing from the technical idea of the present invention.
For example, in the above-described embodiment, the detachable member 11 has a wedge shape having the inclined surface 11a. However, the present invention is not limited to this, and at least the inner peripheral surface 3a of the casing body 3 is attached to and detached from the groove 10. It is only necessary to have the contact surface 11c that is flush with the outer surface Wa of the pipe W.

  That is, in the above-described embodiment, the detachable member 11 has a wedge shape and is fitted in the groove portion 10. However, the detachable member 11 may be fixed by a bolt or the like so as to prevent dropping from the groove portion 10.

  In addition, the groove portion 10 does not necessarily have to be formed in a pair, and the outer surface Wa corresponding to the position of the end of the long axis of the tube material W that is formed in a flat shape and has an elliptical cross section is formed in the groove portion 10. What is necessary is just to determine the magnitude | size of this one groove part 10, or the pressing force in the flat apparatus 4 so that it may not interfere. Two or more groove portions 10 may be formed.

DESCRIPTION OF SYMBOLS 1 ... Pipe material correction apparatus 2 ... Casing 3 ... Casing main body 3a ... Inner peripheral surface 4 ... Flattening device 5 ... Moving device 5a ... Wheel 6 ... Pressing device 7 ... Detachable member moving device 10 ... Groove part 10a ... Bottom surface 10b ... Side surface 11 ... Detachment Member 11a ... Inclined surface 11b ... Orthogonal surface 11c ... Contact surface 12 ... Plate-like part 21 ... Restraint ring 21a ... Inner peripheral surface 22 ... Upper half part 23 ... Lower half part 22a ... Split upper surface 23a ... Split lower surface 22b, 23b ... Recess 24 ... Jack W ... Pipe material Wa ... Outer surface Wb ... Inner surface Wt ... One end P ... Axis S1 ... Gap S2 ... Expanded space

Claims (4)

A casing used for a tube straightening device for correcting roundness in at least a partial region in the axial direction of the tube,
An annular shape centering on the axis is formed, the inner peripheral surface is fitted to the outer surface of the pipe material in the region, the inner peripheral surface is used as a roundness correction type surface, and the pipe material is radially outward from the inner surface. A casing body that is pressed toward
The casing main body and the pipe member are detachably provided in a groove portion that is recessed toward the outside in the radial direction over a whole area in the axial direction in a part of a circumferential direction of the inner peripheral surface of the casing main body. In a state where is fitted, the detachable member having a contact surface that is flush with the inner peripheral surface of the casing body and contacts the outer surface of the pipe,
With
The groove portion has the major axis of the ellipse in a state where the detachable member is removed and the region of the pipe member is pressed from the outside in the radial direction and the cross section perpendicular to the axis is flattened into an elliptical shape. The casing of the pipe material correcting device, wherein the outer surface of the pipe material at the end position is formed in a size that does not interfere.   2. The casing of the pipe material correcting device according to claim 1, wherein a pair of the groove portions are formed in the casing body at positions spaced apart from each other by 180 degrees around the axis. The bottom surface of the groove portion is formed so as to be inclined from the inside in the radial direction of the axis toward the outside from the one side in the axial direction toward the other side,
The said detachable member has an inclined surface that is in contact with the bottom surface in a state where the casing main body and the pipe member are fitted to each other, and is attached to the groove portion. Tubing straightener casing. The casing according to any one of claims 1 to 3,
A moving device for supporting the casing body and moving the casing body relative to the pipe material in the direction of the axis coaxially;
A flattening device for pressing and deforming the pipe material from outside in the radial direction;
An attachment / detachment member moving device that grips the attachment / detachment member, moves the attachment / detachment member relative to the casing body in the axial direction, and attaches / detaches the attachment / detachment member to / from the groove;
A pressing device that presses the tubular material from the inner surface toward the radially outer side;
A pipe material straightening device comprising:

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