JP3382968B2 - Forming roll for pipe production, pipe production method, and ERW pipe - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention holds a strip-shaped metal plate material (for example, thin-walled iron material, brass material, aluminum material) between a groove and a ridge, and performs plastic working to sandwich the plate material. The present invention relates to a forming roll for producing a pipe (hereinafter, simply referred to as a forming roll), which is a continuous tubular body, a pipe producing method, and an electric resistance welded pipe.

[0002]

2. Description of the Related Art Conventionally, a tube manufacturing line as shown in FIG. 3 has been used for manufacturing a tubular body. That is, the coiler 1 in which the strip-shaped metal plate A is wound and stored
The plate material A is supplied to the five-stage forming roll 2 to plastically process the plate material A in steps to bend the plate material A into a tubular body. Then, the joining portion of the tubular body discharged from the forming roll 2 is continuously welded by the welding machine 3, and the diameter of the joined tubular body is continuously reduced to a predetermined diameter by the eight-stage reducer roll 4. Then, the bending of the tubular body is continuously corrected by the five-stage strainer rolls 5, and the tubular body is continuously flattened. Finally, the tubular body is cut into a predetermined length by the cutting machine 6 and dropped into the pillar 7 to be stored.

Here, each of the forming rolls 2 is
As shown in FIG. 4, a concave roller 11 having a groove 10 formed on the outer periphery thereof and a convex roller 1 having a convex strip 12 formed on the outer periphery thereof
3 and 3 are rotatably attached to the shaft members 14 and 15 with the ridge 12 inserted in the groove 10. The plate material A is continuously clamped in the gap between the ridge 12 and the groove 10 to be pressed and formed.

[0004]

However, in the conventional forming roll, since the concave roller 11 and the convex roller 13 are separately attached to the shaft members 14 and 15, the convex roller 13 and the concave roller 11 are formed. The relative position with respect to may sometimes shift in the axial direction, and as a result, as shown in FIG.
There is a difference between the gap between the side wall 2a and the side wall 10b of the groove 10 and the side wall 12b of the ridge 12. In this way, if there is a difference between the two gaps in the axial direction, one of the gaps becomes smaller than the reference value when the plate material A is sandwiched between the concave groove 10 and the ridge 12. While the plate material A is rolled by being pressed as necessary, the other gap is larger than the reference value, so that a clearance is generated between the plate material A and the groove 10 or the ridge 12, and the plate material A is Forming is insufficient without being pressed at all, and as a result, the left and right curvatures of the plate material A are changed, and as shown in FIG. 6A, the end portion of the plate material A is radially aligned at the joint A1. There is a problem of causing a defect such as a shift (hereinafter, referred to as a mismatch defect).

Further, according to the conventional forming roll 2, as shown in FIG. 5, the plate material A is merely sandwiched between the groove 10 and the ridge 12, and the width direction of the plate material A is reduced. The positioning may not be performed, and the plate material A may deviate from the predetermined position with respect to the groove 10. As described above, when the plate material A is formed into a tubular shape while the relative position of the plate material A with respect to the concave groove 10 is deviated, as shown in FIG. There is a problem in that the joint A1 of the plate material A is displaced in the circumferential direction and a defect (hereinafter referred to as a twist defect) such as a defective welding of the joint A1 occurs.

As described above, since the mismatch defect and the twist defect are particularly remarkable when the plate material A has a small thickness, conventionally, an extremely thin plate material (for example, an aluminum material of 0.25 mm or less) is tubular. Could not be molded into.

The present invention has been made in view of the above circumstances, and it is possible to prevent the occurrence of the mismatch defect and the twist defect, and it is possible to easily and surely form an extremely thin plate material into a tubular shape. An object of the present invention is to provide a roll, a pipe manufacturing method, and an electric resistance welded pipe.

[0008]

A forming roll according to claim 1 of the present invention comprises a concave roller having a concave groove formed on the outer circumference thereof and a convex roller having a convex stripe formed on the outer circumference thereof.
In a forming roll for pipe manufacturing, in which a plate-shaped plate material is sandwiched between the concave groove and the ridge and subjected to plastic working to form the plate material in a tubular shape, between the convex roller and the concave roller, A regulating mechanism for regulating the relative axial position of the convex roller and the concave roller is provided so that the gap between the side wall of the concave groove and the side wall of the convex line becomes substantially the same at two points in the axial direction. The groove is open at both ends in the width direction.
Consists of the vertical side wall forming the mouth and the widthwise center of the groove
Formed between the flat portion and the vertical side wall portion
And a curved portion that is formed,
The width between the vertical sidewalls is parallel to the flat portion of the groove, and
The width of the concave groove is set so that it can be inserted from the opening of the concave groove on the lower side of both vertical side walls of the concave groove.
The plate material that is in parallel with the parts by contacting each end of the plate material
Receiving, wherein the convex portion for regulating the relative position with respect to the concave roller of the plate is formed.

A forming roll according to a second aspect of the present invention is the forming roll according to the first aspect, wherein the regulating mechanism is coaxially attached to one of the convex roller and the concave roller, and the end portion of the forming roller is the other. It consists of a ring member that contacts a convex roller or a concave roller.

According to a third aspect of the present invention, in the forming roll according to the first or second aspect, at least the ridges of the convex roller are made of a material having a higher elasticity than the work material. Is characterized by.

According to a fourth aspect of the present invention, there is provided a method for producing a pipe, wherein the forming roll for producing a pipe according to any one of the first, second and third aspects is used to sequentially curve the plate material to form a tubular body. To do.

In the electric resistance welded pipe according to claim 5 of the present invention, the plate material is sequentially curved and formed into a tubular body by using the forming roll for pipe production according to any one of claims 1, 2, and 3. It is obtained by welding the joint portion of the plate material.

According to the forming roll of the first aspect of the present invention, the relative position of the convex roller and the concave roller in the axial direction is restricted by the restricting mechanism so that the side wall of the concave groove and the side wall of the convex groove. Since the gap between them is made substantially equal to each other at two points in the axial direction, it is possible to prevent the gap between the side wall of the concave groove and the side wall of the ridge from being different, and therefore, the plate material Forming can be performed evenly on the left and right, and the plate material can be curved with the same curvature on the left and right.
It is possible to prevent a mismatch defect from occurring.

Further, according to the forming roll of the first aspect , the relative position of the plate material to the concave roller, that is , the vertical side walls of the concave groove and the convex portions formed below the vertical side wall portion, that is,
Positional deviation of the plate material in the groove in the width direction and flatness of the plate groove
Since the parallelism with respect to the carrier portion is regulated, the plate material is prevented from being deviated and biased with respect to the concave roller, and the plate material can be evenly curved from the center, and as a result, the joint part at the end of the plate material is It can be positioned at a regular position without shifting in the circumferential direction, and the occurrence of twist defects can be prevented in advance.

By virtue of the synergistic effect of the above operations, it becomes possible to form a plate material having a thickness smaller than the conventional limit forming thickness into a tubular shape.

According to the forming roll of claim 2, the relative position of the convex roller and the concave roller is regulated by the engagement of the ring member and the convex roll or the concave roll, and the forming roll according to claim 1. Similarly, the occurrence of mismatch defects can be prevented. Moreover, since the desired purpose can be achieved with a simple structure such as a ring member, the improvement of the conventional device is minimal and extremely economical.

According to the forming roll of the present invention, since the convex roller is formed of a material having elasticity higher than that of the work material used in the conventional forming roll, the convex roller is more than the thickness of the plate material. A plate material can be sandwiched between the groove and the ridge by defining the positional relationship between the ridge roller and the concave roller so as to reduce the gap between the groove and the ridge. It can be formed into a tubular shape with an elastic restoring force applied. As a result, when forming with a ridge roller made of high-rigidity steel, the distance between the concave groove and the ridge must be set to a size approximately equal to the plate thickness of the plate material, and the plate material must be pressed completely. Therefore, the spring-back molding part of the plate material expands when it comes out of the convex roller and the concave roller, and when it enters the forming roll of the next stage, this forming roll and the plate material interfere with each other and an unreasonable load is applied to the plate material. However, in the present invention, since the plate material is formed in a state where the elastic restoring force is applied, springback of the plate material is suppressed, Buckling can be prevented.

Further, according to the forming roll of the third aspect, in order to exert the elastic restoring force, even if the interval between the concave groove and the convex line is made considerably smaller than the plate thickness of the plate material, the convex shape having rigidity is formed. Unlike the roller, the plate material is not rolled to reduce the plate thickness. Moreover, since the plate material is held in close contact with the concave groove and the ridge due to the elastic restoring force of the convex roller, a slip occurs between the plate material and the convex roller or the concave roller when the plate material is fed. This can be suppressed, and smooth feeding of the plate material can be ensured.

According to the pipe manufacturing method of the fourth aspect, the plate material can be uniformly formed on the left and right sides, and the plate material can be curved with the same curvature on the left and right sides. As a result,
It is possible to prevent the occurrence of a mismatch defect, prevent the plate material from deviating from the concave roller, and evenly curving the plate material from the center. The joint portion can be positioned at a regular position without being displaced in the circumferential direction, and the occurrence of a twist defect can be prevented in advance.

According to the electric resistance welded pipe of the fifth aspect, the mismatch defect and the twist defect are not generated, and the welding of the joint portion of the plate materials is performed cleanly and surely.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A forming roll 20 according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the forming roll 20 of this embodiment has a concave roller 23 fixed to a shaft 21 and having a groove 22 formed on the outer periphery thereof, and the shaft 21.
And a convex roller 26 fixed to a shaft 24 arranged in parallel with the convex roller 25 and having a ridge 25 formed on the outer periphery thereof. The outer end of the ridge 25 is housed in the groove 22.

A ring member (regulating mechanism) 27 is coaxially fixed by bolts 28 to both ends of the convex roller 26, and the convex strip 25 is housed in the concave groove 22. The side surface of each ring member 27 is in contact with both end surfaces of the concave roller 23, and the concave roller 23 is sandwiched between the ring members 27. The contact between the ring member 27 and the concave roller 23 regulates the relative position between the concave roller 23 and the convex roller 26. Due to this regulation, the gap size between the side wall 22a of the concave groove 22 and the side wall 25a of the convex line 25 and the gap size between the side wall 22b of the concave groove 22 and the side wall 25b of the convex line 25 are in the axial direction. It becomes almost the same in two places.

The projection 25 has a ring shape, is coaxially fitted into the projection roller 26, and is integrated by a bolt 29. The ridge 25 is made of a material having elasticity higher than that of steel, which is a material of the conventional forming roll,
For example, it is made of urethane resin.

As shown in FIG. 2A, the concave roller is
The concave groove 22 of 23 is formed at both ends in the width direction of the concave groove 22.
The vertical side wall portion 22A is formed so as to form the opening of 22.
The curved side walls 22a, 22
b is formed, and the flat portion 22 is formed in the widthwise central portion of the groove 22.
c is formed. The shoulders of the concave groove 22 of the concave roller 23 (upper side walls of the concave groove 22) have the same vertical
Located below the side wall 22A and above the side walls 22a and 22b.
A convex portion 30 that extends in the circumferential direction so as to be placed is formed. With the above structure , when the plate material A is drawn between the concave groove 22 and the convex strip 25, both ends a of the plate material A are brought into contact with the respective convex portions 30 and the position thereof is regulated. . That is, the vertical side wall portion 22A allows the plate material A to be positioned in the width direction.
The flat portion in the center of the concave groove 22 is arranged by the convex portion 30.
The parallelism to 22c is secured. In this way, by contacting both ends a of the plate material A with the convex portion 30, the plate material A
Is positioned at a predetermined position with respect to the groove 22.
Note that, as shown in FIG. 2B, the protrusion amount of the convex portion 30 may be reduced.

Next, the forming roll 20 of this embodiment is formed.
The action of will be described.

First, the plate material A wound around the coiler is guided between the groove 22 and the ridge 25 of the forming roll 20.
Next, the shafts 21 and 24 are rotated to drive the convex roller 2
6 and the concave roller 23 are rotationally driven, and the plate material A is continuously bitten into the forming roll 20. Then, the plate material A is formed into a tubular shape by being formed by the groove 22 and the ridge 25.

Here, the ring member 27 and the concave roller 23
The relative position of the convex roller 26 and the concave roller 23 is regulated by the contact with the side wall 22a, 22b of the concave groove 22 of the concave roller 23 and the side wall 25 of the convex line 25 of the convex roller 26.
The gaps between a and 25b are set to be substantially the same at two points in the axial direction. Therefore, the groove 2
2 side walls 22a and 22b and side walls 25a and 25 of the ridge 25
It is possible to prevent a difference from being generated in the gap with b, to form the plate material A uniformly on the left and right sides, and to bend the plate material A with the same curvature on the left and right sides. As a result, the ends of the plate material A can be accurately joined without being displaced in the radial direction, and the occurrence of mismatch defects can be prevented.

Further, in the above embodiment, the convex portions 30 are formed on the both side walls 22a and 22b of the concave groove 22, and the plate material A is brought into contact with the convex portions 30 by contacting the end portions a of the plate material A. Since the relative position of A with respect to the concave roller 23 is regulated, that is, the position of the plate material A in the width direction and the concave groove 22
To regulate any parallelism to the flat part 22c
Therefore, the plate material A is prevented from being deviated and biased with respect to the concave roller 23. Therefore, when the plate material A is formed, the plate material A can be curved evenly from the center. As a result, the joint portion of the end portion a of the plate material A can be positioned at the regular position without shifting in the circumferential direction, and the occurrence of the twist defect can be prevented.

In the present embodiment, due to the synergistic effect of the ring member 27 and the convex portion 30, it becomes possible to form a plate material having a thickness smaller than the conventional limit plate thickness into a tubular shape. By the way, when an aluminum material is used for the plate material A, it is conventionally 0.
It was not possible to mold those of 25 mm or less,
With the forming roll 20 of this embodiment, 0.2
Even with a plate thickness of 0 mm, it could be molded cleanly without causing buckling.

Further, according to this embodiment, the ring member 27
The relative position between the convex roller 26 and the concave roller 23 is regulated by the contact between the concave roller 23 and the concave roller 23, and the desired purpose can be achieved with a simple structure such as providing the ring portion 27. However, the improvement of the conventional device is minimal and it is extremely economical. In the above embodiment,
Although the ring member 27 is provided on the convex roller 26, a similar ring member is provided on the concave roller 23 and the ring member and the convex roller 23 come into contact with each other so that the concave roller 23 and the convex roller 26 are connected to each other. The relative position may be restricted.

The forming roll 2 of the above embodiment
According to No. 0, since the convex roller 26 is formed of a material having elasticity, the convex roller 26 and the concave roller 26 are formed so that the gap between the concave groove 22 and the convex line 25 is smaller than the thickness of the plate material A. The plate material A can be sandwiched between the groove 22 and the ridge 25 by determining the positional relationship with the groove 23, and the elastic restoring force of the ridge 25 of the convex roller 26 acts on the plate material A. It can be formed into a tubular shape. Therefore, since the plate material A is formed in a state where the elastic restoring force acts, the spring back of the plate material A is suppressed, and when the plate material A enters the forming roll 20 of the next stage, the forming roll 20 and the plate material A interfere with each other. This prevents the plate material A from buckling due to interference.

The forming roll 2 of the above embodiment
According to 0, even if the distance between the concave groove 22 and the ridge 25 is made considerably smaller than the plate thickness of the plate material A in order to exert the elastic restoring force, the plate material A is different from the rigid convex roller. The thickness is not reduced by rolling due to the pressing by forming.

Moreover, since the plate material A is held in close contact between the groove 22 and the convex line 25 by the elastic restoring force of the convex line 25 of the convex roller 26, the plate material A is conveyed to the plate material A when it is fed. It is possible to suppress slippage between the convex roller 26 and the concave roller 23. Therefore, the plate material A can be smoothly transferred and molded.

[0034]

As described above, according to the forming roll of the present invention, the forming roller is provided with the concave roller having the concave groove formed on the outer circumference and the convex roller having the convex stripe formed on the outer circumference. In the forming roll for pipe manufacturing, which sandwiches the strip-shaped plate material between the ridge and the ridge to form the plate material in a tubular shape by performing plastic working, between the convex roller and the concave roller, the concave groove is formed. A regulating mechanism for regulating the relative position of the convex roller and the concave roller is provided so that the gap between the side wall and the side wall of the convex line is substantially the same at two points in the axial direction. the side walls of the groove, the convex portion for regulating the relative position and the vertical wall portion with respect to the concave roller of each end the plate in contact with the plate material is formed, the position in the width direction of the plate
Runode can regulate the parallelism against the flat portion of the regulation and groove,
The occurrence of mismatch defects and twist defects can be prevented, and even an extremely thin plate material can be easily and reliably formed into a tubular shape.

According to the pipe manufacturing method of the present invention, since the plate material is sequentially curved and formed into the tubular body by using the manufacturing forming roll, the plate material can be uniformly formed on the left and right sides, and the plate material can be formed on the left and right sides. It is possible to bend with the same curvature, and as a result, it is possible to prevent the occurrence of mismatch defects, and also to prevent the plate material from deviating from the concave roller and biasing it evenly from the center. As a result, the joint portion at the end of the plate material can be positioned at the regular position without shifting in the circumferential direction, and the occurrence of the twist defect can be prevented in advance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a forming roll of the present invention.

FIG. 2 is an enlarged cross-sectional view showing the concave roller of FIG.

FIG. 3 is an overall configuration diagram showing a conventional pipe manufacturing line.

FIG. 4 is a cross-sectional view showing a conventional forming roll.

5 is an enlarged cross-sectional view showing a concave roller and a convex roller of FIG.

FIG. 6 is a cross-sectional view showing a defect of the conventional tube manufacturing method.

[Explanation of symbols]

20 Forming Roll 22 Concave Groove 22A Vertical Side Walls 22a and 22b Side Wall 22c Flat Part 23 Concave Roller 25 Convex Strip 26 Convex Roller 27 Ring Member (Regulating Mechanism) 30 Convex A Plate

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21D 5/00-9/00 B21C 37/08

Claims (5)

(57) [Claims] 1. A concave roller having a concave groove formed on the outer periphery thereof,
In a forming roll for pipe manufacturing, comprising: a convex roller having a ridge formed on the outer periphery thereof, and a strip-shaped plate material is sandwiched between the concave groove and the ridge to perform plastic working to form the plate material into a tubular shape. Between the convex roller and the concave roller, the convex roller and the concave roller are arranged such that the gap between the side wall of the concave groove and the side wall of the convex line is substantially the same at two points in the axial direction. A vertical side wall portion is provided with a regulating mechanism for regulating the relative position of the roller in the axial direction, and the concave groove constitutes openings at both ends in the width direction.
And a flat portion that constitutes the widthwise central portion of the groove and the flat portion
And a curved portion formed between the vertical side wall portion and the vertical side wall portion.
Made, flat width of the groove between the vertical side wall of the opening portion of the groove
The width of the plate material can be inserted in parallel with the
On the lower side of both vertical sidewalls , insert from the opening of the groove.
The plate member that is parallel to the flat part of the groove.
A forming roll for manufacturing a pipe, which is formed with a convex portion which comes into contact with each end of the plate and receives the plate member to regulate a relative position of the plate material with respect to the concave roller. 2. The regulating mechanism comprises a ring member coaxially attached to one of the convex roller and the concave roller and having an end portion abutting against the other convex roller or concave roller. Item 1. A forming roll for producing a pipe according to item 1. 3. The forming roll for manufacturing a pipe according to claim 1, wherein the convex roller is formed of a material having elasticity higher than that of a material to be processed. 4. A pipe manufacturing method for forming a tubular body by sequentially forming the plate material by using the forming roll for manufacturing a pipe according to claim 1, 2, or 3. 5. The pipe forming forming roll according to claim 1, wherein the plate material is sequentially curved to form a tubular body, and the joint portion of the plate material is welded. ERW tube.