JP2017185498A - Method and device for manufacturing metal tube with groove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a metal tube with a groove by an electro-resistance-welded tube manufacturing device.SOLUTION: When concaved grooves extending in a tube longer direction are formed at plural portions which are spaced from one another in a circumferential direction of an external surface of a metal tube by an electro-resistance-welded tube manufacturing device, concaved grooves 8a extending in a tube longer direction are formed at plural portions which are spaced from one another in a circumferential direction of an external surface of a metal tube 8 which passed through a sizing roll by spheres 55 of plural spherical convexes 56 and plural recesses 20a of an inner ring 20 in an inner ring grooving device 10A. After formation of the metal tube, the concaved groove 8a is formed on the metal tube 8 by the sphere 55 of the spherical convex 56 and the recess 20a of the inner ring 20, and therefore a metal tube having an irregular cross-sectional shape can be easily obtained.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a grooved metal pipe manufacturing method and apparatus for manufacturing a metal pipe having concave grooves extending in the longitudinal direction of the pipe at a plurality of locations spaced in the circumferential direction of the pipe outer peripheral surface by the electric sewing pipe manufacturing apparatus. About.

The electric sewing tube manufactured by the electric sewing tube manufacturing apparatus is widely used for various applications.
As a method for forming a concave portion in an electric sewing tube, there is a method of forming a rectangular metal element tube having an embossed pattern in Patent Document 1. Patent Document 1 discloses that rectangular recesses (embosses) are formed on both side surfaces of a rectangular metal tube at intervals in the longitudinal direction of the tube.
The rectangular concave portion of the rectangular metal pipe of Patent Document 1 is assumed to be used as a skid (sleeper) for placing the packed steel material with a gap instead of directly on the floor surface. In this way, rectangular rectangular recesses 30 are formed at intervals in the radial direction (side length direction) of the rectangular metal tube 31 to increase the strength against the crushing load applied in the radial direction of the rectangular metal tube placed as a sleeper on the floor. Yes.
Conventionally, a metal pipe such as a steel pipe having a concave groove extending in the longitudinal direction of the pipe has not been manufactured by an electric resistance welder manufacturing apparatus.

  When a square metal tube is manufactured in the electric sewing tube manufacturing apparatus, as shown in FIG. 15, it is curved and formed into an arc shape with a plurality of (four in the illustrated example) breakdown rolls (BDR), and then a plurality of (see FIG. In the example shown, three-stage fin pass rolls (FPR) are formed into a nearly circular shape (open circle) with both edges approaching, and then both edges are butt welded in the welding process using a squeeze roll (SQR) and a high-frequency welder. Then, a circular tube is formed, and then a rectangular metal tube is manufactured by a shaping process using a plurality of sizing rolls (SZR) and a straightening Turks head roll (THR).

JP-A-63-111718

  As described above, a metal pipe such as a steel pipe having a concave groove extending in the longitudinal direction of the pipe has not been manufactured by the electric sewing tube manufacturing apparatus, but a concave groove extending in the longitudinal direction of the pipe is formed in the metal pipe such as a steel pipe. Then, it is effective for enhancing the cross-sectional function. In particular, if concave grooves extending in the longitudinal direction of the pipe are formed on the four surfaces of a square steel pipe used for the column material, the effect of improving the cross-sectional function is high.

  The present invention has been made on the basis of the above background, and is formed by forming a concave groove extending in the longitudinal direction of the pipe at a plurality of locations spaced in the circumferential direction of the outer surface of a metal pipe such as a steel pipe by an electric-welded pipe manufacturing apparatus. It is an object of the present invention to provide a method for manufacturing a grooved metal tube.

In the invention of claim 1 which solves the above-mentioned problem, the metal plate is bent into a substantially circular shape by a breakdown roll and a fin pass roll, and both edges of the substantially circular curved metal plate are formed by a subsequent squeeze roll and a welding device. A grooved metal pipe manufacturing method for manufacturing a grooved metal pipe by an electric resistance welded pipe manufacturing apparatus that is butt welded into a circular pipe and then shaped by a sizing roll,
After passing through the sizing roll, an extra-tube rotating mechanism having a plurality of extra-tube rotating bodies having convex portions that press the outer surface of the pipe at intervals in the circumferential direction; The circumferential direction of the outer surface of the metal tube that has passed through the sizing roll by the plurality of outer tube rotating bodies and the plurality of recess members of the core grooving device including a core having a plurality of recess members that receive corresponding portions. It is characterized in that concave grooves extending in the longitudinal direction of the tube are formed at a plurality of positions spaced apart from each other.

  According to a second aspect of the present invention, in the method of manufacturing a grooved metal tube according to the first aspect, a rear end portion of a rod-like or linear body is attached to a fixed portion disposed inside the substantially circular curved metal plate in the fin pass roll region. It is connected directly or indirectly, and the core is attached to the tip of the rod-like or linear body.

  According to a third aspect of the present invention, in the method for manufacturing a grooved metal pipe according to the second aspect, when the welding device is a high frequency induction heating type welding device, the rear end portion of the rod-like or linear body is attached to the welding device. It is characterized in that it is connected to the tip of the impeder core that constitutes a part.

  A fourth aspect of the present invention is the method of manufacturing a grooved metal pipe according to any one of the first to third aspects, wherein the extra-rotary body of the extra-tube mechanism is a sphere that is rotatably held by a receiving portion, The recess material of the core is a recess die having a recess corresponding to the sphere.

  Claim 5 is the method for manufacturing a grooved metal tube according to any one of claims 1 to 3, wherein the tube outer rotating body of the tube outer mechanism has the protrusion on the outer surface of the cylindrical body. The concave portion material of the core is a concave roller or a concave die having a concave portion corresponding to the convex portion of the convex roller.

The invention according to claim 6 is a grooved metal tube for forming a groove extending in the longitudinal direction of the pipe at a plurality of locations spaced in the circumferential direction of the outer surface of the pipe on the circular tube manufactured by the electric sewing tube manufacturing apparatus. A manufacturing method of
An extra-tube mechanism having a plurality of outer-rotating bodies having projections that press the outer surface of the pipe, spaced apart in the circumferential direction, and a plurality of recesses that are disposed in the pipe and receive locations corresponding to the respective outer-rotating bodies. Using a core grooving device with a core having a member,
The metal tube is moved relative to the core grooving device, and the tube length is set at a plurality of locations spaced in the circumferential direction of the outer surface of the metal tube by the plurality of outer tube rotating bodies and the plurality of recessed members. A concave groove extending in the hand direction is formed.

According to the invention of claim 7, the metal plate is bent into a substantially circular shape by a breakdown roll and a fin pass roll, and both edges of the substantially circular bent metal plate are butt welded by a subsequent squeeze roll and a welding device. A grooved metal tube for manufacturing a grooved metal tube which forms a groove extending in the longitudinal direction of the tube at a plurality of locations spaced apart in the circumferential direction of the outer surface of the tube by an electric resistance tube manufacturing apparatus which is formed into a tube and then shaped by a sizing roll Manufacturing equipment,
An extra-tube mechanism having a plurality of outer-rotating bodies having projections that press the outer surface of the pipe, spaced apart in the circumferential direction, and a plurality of recesses that are disposed in the pipe and receive locations corresponding to the respective outer-rotating bodies. A core grooving device including a core having a member is installed on the downstream side of the sizing roll, and the rear portion of the core is disposed inside the substantially circular curved metal plate in the fin pass roll region. It is characterized in that it is connected to the tip of a rod-like or linear body in which the rear end is directly or indirectly connected to the fixed part.

The invention according to claim 8 is a grooved metal tube for forming a groove extending in the longitudinal direction of the tube at a plurality of locations spaced apart in the circumferential direction of the outer surface of the tube on the circular tube manufactured by the electric sewing tube manufacturing apparatus. Manufacturing equipment,
An extra-tube mechanism having a plurality of outer-rotating bodies having projections that press the outer surface of the pipe, spaced apart in the circumferential direction, and a plurality of recesses that are disposed in the pipe and receive locations corresponding to the respective outer-rotating bodies. A core grooving device including a core having a member, and a relative movement mechanism for relatively moving the metal tube and the core grooving device are provided.

  According to the present invention, it is possible to form concave grooves extending in the longitudinal direction of a pipe at a plurality of locations spaced in the circumferential direction of the outer surface of a metal pipe such as a steel pipe in an electric sewing pipe manufacturing line or offline. By forming the groove, the cross-sectional performance of a metal pipe such as a steel pipe can be enhanced.

After the metal tube is formed, a concave groove is formed in the metal tube by the extra-rotary body of the extra-tube mechanism and the concave member of the inner core of the tube, so that a deformed cross-section metal tube can be easily obtained. Therefore, the product types as square tube products can be expanded.
In addition, as compared with the conventional molding method only from one side, molding can be performed from both sides (both sides of the inner and outer surfaces of the pipe), so that, from the standpoint of a roll designer, the degree of freedom in designing a roll having a required sectional shape is increased.

  In particular, when a concave die having a concave portion corresponding to a sphere is used as the concave member in claim 4, it is extremely compact and simple, it is not necessary to provide a plurality of steps, only one step is required, and the space is reduced. The equipment cost is also cheap.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which illustrates typically the electric-sealed-tube manufacturing apparatus which enforces the manufacturing method of the grooved metal tube of one Example of this invention. It is a figure explaining the outline of the principal part of this invention in FIG. 1A and 1B show the structure of a spherical grooved core grooving device 10A shown in FIG. 1, wherein FIG. 1A is a front view of the housing 16 with the lid 16c removed, and FIG. FIG. 3 is a left side view (the illustration of the metal tube 8 is omitted). 3A is a cross-sectional view taken along the line AA in FIG. 3B, and FIG. 3B is a simplified view of the main part of FIG. 3A (the metal pipe 8 is also omitted). It is a figure explaining the grooving state of one grooving process part (part of the lower spherical body 55 of FIG. 3 (B)) in the core grooving apparatus of FIG. (A) is an enlarged view of the roller-type core grooved device 10B in FIG. 1, and (b) is a main part front view of one grooved part in (a). FIG. 7 is a schematic front view of the core grooving device, showing an embodiment in which both the outer tube mechanism and the core of the core grooving device are of a roller type. FIG. 8 is a left side view of FIG. 7. It is a figure which shows the outline of the Example of the core grooving apparatus in the case of installing offline rather than in an electric sewing pipe manufacturing line. It is a principal part front view of one grooved part in the core grooved apparatus of FIG. It is a figure explaining the reduction adjustment mechanism in the case of providing a reduction adjustment mechanism in the core groove forming apparatus of FIG. It is a figure explaining the reduction adjustment mechanism in the case of providing a reduction adjustment mechanism in the core grooving apparatus of 10A of FIG. 3, FIG. The example in the case of manufacturing a square metal tube by the manufacturing method of the metal tube with a groove of the present invention is shown, and (b) is a case where a concave groove which continues on four sides of a square metal tube is formed. Shows the case where long and narrow concave grooves are intermittently formed on the four surfaces of the square metal tube in the longitudinal direction of the tube. The example of the cross-sectional shape of the grooved metal tube manufactured with the manufacturing method of the metal tube of this invention is shown, (I) is a grooved square metal tube, (B) is a grooved pentagonal metal tube, (C) is In the case of a hexagonal metal tube with grooves, (d) for a circular metal tube with 4 grooves, (e) for a circular metal tube with 6 grooves, and (f) for a square metal tube with corner grooves, This is the case of a square metal tube with two grooves on one side. It is a figure which illustrates typically the electric sewing tube manufacturing apparatus which manufactures a general square metal tube. It is a figure explaining the conventional square metal tube provided with the rectangular recessed part elongated in radial direction.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out a grooved metal tube manufacturing method and apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 is a diagram schematically illustrating an electric sewing tube manufacturing apparatus for carrying out a method of manufacturing a grooved metal tube according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating an outline of a main part of the present invention in FIG. It is.
A metal plate fed out from an uncoiler (not shown) passes through a leveler, a looper, a pinch roll, etc. (all not shown), and is bent into an arc shape by a plurality of (four in the illustrated example) breakdown rolls (BDR). Then, a multi-stage (three stages in the illustrated example) fin pass roll (FPR) is formed into a substantially circular shape (open circle) with both edges approaching each other, followed by a welding process using a squeeze roll (SQR) and a high-frequency welder Both edges are butted and welded to form a circular pipe, and then shaped into a square metal pipe by a shaping process using a plurality of sizing rolls (SZR).
Next, grooving is performed by the core grooving apparatus 10 (10A or 10B) of the embodiment of the present invention, and a rectangular metal pipe with grooves is obtained in the illustrated example. After this grooving process, it is corrected with a THR (correcting roll). In addition, after shaping | molding into a square metal tube by the shaping process by a sizing roll (SZR), after correcting with a THR (correction roll), you may perform a grooving process by 10A or 10B.
1 and 2, both 10A and 10B can be installed at the same position on the molding line, and when one is used, the other is retracted to a preparation position outside the line.
For pipes with a small diameter, it is advantageous in terms of processing space and the like to use 10A.

An outline of the core grooving device 10 (10A or 10B), which is a main part for manufacturing a grooved rectangular metal tube by the grooved metal tube manufacturing method of the present invention, and an auxiliary device thereof will be described with reference to FIG. A core 20 to be described later which is a concave die of the core grooving device 10 is connected to the tip of a connecting rod (rod-like body) 14 connected to the tip of the impeder core 13 constituting a part of the welding device. Yes. The impeder core 13 is a magnetic core that collects the magnetic flux generated by the coil in the high-frequency induction heating device, and efficiently heats the butted portions of both edges of the metal plate.
The rear end portion of the impeder core 13 is connected to a fixed portion 15 that is disposed on the curved inner side of the metal plate 1 that is substantially circularly curved by a fin pass roll (FPR).
When the impeder core 13 is not used, the core 20 of the core grooving device 10 and the fixing portion 15 may be directly connected by a rod-shaped body. In addition, it can replace with a rod-shaped body and can use linear bodies, such as a wire.

The core grooving device 10A is a spherical core grooving device, and the core grooving device 10A will be described with reference to FIGS.
3A and 3B show the structure of the core grooving device 10A. FIG. 3A is a front view, FIG. 3B is a left side view showing a part of FIG. 3A, and FIG. (B) is a cross-sectional view taken along the line A-A, (B) is a simplified view of the main part of FIG. 3 (A) (the metal tube 8 is also omitted), and FIG. 5 is an arrow in FIG. It is a figure explaining the condition where a ditch | groove is formed about the location of B.
As shown in these drawings, the core grooving device 10 </ b> A includes an external mechanism 19 and a core 20 in a housing 16.
The outside-tube mechanism 19 has four spherical convex molds 56 formed by receiving and supporting a spherical body 55 so as to be rotatable in any direction on the concave spherical seat 54a of the receiving portion 54 having the concave spherical seat 54a. I have. The seat portion 54 includes a seat portion main body 54b and a lid body 54c that holds the upper portion of the sphere 20. Each spherical convex 56 is slidable in the direction toward the center of the core 20 in the housing 16, and is operated by operating the adjusting bolt 21 screwed into the receiving portion 54 of the spherical convex 56. The reduction can be adjusted by adjusting the position of the convex 56 (the position of the sphere 55). The adjustment bolt 21 can only be rotated, and the spherical convex mold 56 can be moved and adjusted by turning the adjustment bolt 21.
The housing 16 includes a housing main body 16a that accommodates the four spherical convex molds 56, an inner base plate 16b, and an outer lid body 16c, which are integrated with bolts.
The base plate 16 b of the housing 16 and the frame plate 26 arranged near the rear end of the core 20 are connected by four rods 25.
The core 20 is a steel member that is disposed in a pipe and has four concave portions (concave members) 20a that receive portions corresponding to the spherical bodies 55 of the spherical convex molds 56 of the external mechanism 19 respectively. In addition, the rear end portion of the connecting rod 14 screwed and connected to the rear end of the core 20 is connected to the front end portion of the impeller core 13 as shown in FIG.

As described above, after being shaped into a rectangular metal tube (rectangular metal tube without a concave groove) 8 ″ by a shaping step using a plurality of sizing rolls (SZR), grooving is performed by the core grooving device 10A.
That is, when a rectangular metal tube 8 ″ without a concave groove passes through the core grooving device 10A, each tube wall (four-side plate material) 8c of the rectangular metal tube 8 ″ has a spherical shape as shown in FIG. 14 is pushed into the concave portion 20a of the core 20 by the protruding portion of the spherical body 55 of the convex mold 56, and has a continuous shape as shown in FIG. A groove 8a is formed.

In addition, when forming the concave grooves spaced apart in the longitudinal direction of the tube, a vertical movement mechanism for driving the spherical convex molds 56 of the outer tube mechanism 19 up and down is provided, and each spherical surface is formed in an area where no concave grooves are formed. The convex shape 56 is raised.
As a result, a grooved metal tube 8 ′ having concave grooves 8b spaced in the longitudinal direction of the tube as shown in FIG.
In addition, by separating the position of the spherical convex 56 (position of the sphere 55) in the core grooving apparatus 10A from the core 20 (releasing the reduction), it is possible to manufacture a rectangular metal tube without a concave groove.

FIG. 6 (a) is an enlarged view of the core grooving device 10B by the roller method in FIG.
The core grooved device 10 </ b> B of this embodiment is provided with grooved portions 32 on the front and rear of the frame 31 in the tube feeding direction. The same figure (B) is a principal part front view of the exit side groove part 32 in (A).
The core 20 in the tube is the same as the core 20 that is the die for the recess of the first embodiment. However, as a tube external mechanism 39 outside the tube, a convex portion corresponding to the recess 20a of the core 20 on the outer periphery. A convex roller 37 having 37a is used.
In this embodiment, when a rectangular metal pipe 8 ″ without a concave groove (the thickness of the pipe is shown only by a line) passes through the core grooving device 10B, each pipe wall (four sides) of the rectangular metal pipe 8 ″. The plate material) 8c is pushed into the concave portion 20a of the core 20 by the convex portion 37a of the convex portion roller 37 to form the concave groove 8a.
In addition, in order to form a shape like the concave groove 8a, it is necessary to form corners, and therefore, two steps are necessary. (Preforming is required for forming with roll and core.)

FIG. 7 shows an embodiment in which both the outer tube mechanism of the core grooving device and the core are of the roller type, a schematic front view of the core grooving device 10B ′, and FIG. 8 is a left side view. It is.
In this embodiment, as shown in FIG. 8, grooved portions 42 are provided on the front and rear sides of the frame 41 in the tube feed direction, as in the case of the second embodiment.
Each grooved portion 42 has four concave rollers 48 each having a concave portion 48a as a core attached to a square bar-shaped core support 48b.
A convex roller 47 having a convex portion 47 a corresponding to the concave portion 48 a of the concave roller 48 is used as the extra-tube mechanism 49, which is a roller system as in the second embodiment. The convex roller 47 is movable up and down and can be reduced.
In this embodiment, when a rectangular metal tube 8 ”without a concave groove (the thickness of the tube is indicated only by a line) passes through each grooved portion 42, 42 of the core grooved device 10B ′, the rectangular metal tube Each tube wall (four-sided plate material) 8c of the tube 8 '' is formed by a convex portion 47a of the convex portion roller 47 and a concave portion 48a of the concave portion roller 48, as shown in FIG. A concave groove 8a is formed.

FIG. 9 is a diagram showing an outline of an embodiment of the core grooving device 10C in the case where the core grooving device 10C is installed off-line instead of in the electric sewing tube manufacturing line. This core grooving device 10C includes two grooving portions 76 in the frame 75 as in the core grooving device B ′ of the third embodiment. FIG. 10 is a front view of an essential part of one grooved portion 76 in the core grooved device 10C of FIG.
Each grooved portion 76 itself of the core grooving device 10C is basically the same as the grooved portion 42 of the third embodiment shown in FIGS. 7 and 8, and a recess having a recess 48a as a core. A convex roller 47 having a convex portion 47a corresponding to the concave portion 48a of the concave roller 48 is used as the tube outer mechanism 49, but the reduction of the convex roller 47 can be released. It has a structure.
That is, as shown in detail in FIG. 11, a roller frame 62 that supports the shaft of the convex roller 47 is attached to a fixed disk 63 so as to be movable in the radial direction, and a rotating disk that can turn around the fixed disk 63. 64 is provided, and a link plate 66 is disposed in a space between the upper surface of the roller frame 62 and the groove processing portion 65 of the rotary disk 64. When the rotating disk 64 is rotated counterclockwise by the lever 67, the ring plate 66 is pushed by the shoulder 65a of the recessed groove machining portion 65 and changes its position obliquely as indicated by a broken line. As a result, a gap δ is formed between the lower end of the ring plate 66 and the upper surface of the roller frame 62, the pressing of the link plate 66 (the reduction of the roller 47) is released, and the convex roller 47 freely moves up and down. Since it becomes possible (released state), it is possible to easily switch to a state in which no grooving is performed. In addition, the switching operation is extremely easy because the pressing-down state and the releasing state of the four convex portions 47 can be switched at the same time with one lever operation.

In this core grooved device 10C, for example, a stopper 72 is attached to an end portion of a wire 71 (which may be a pipe) passed through a rectangular metal tube 8 ″ without a groove, and the wire 71 is pulled by a winch 73. Then, the rectangular metal tube 8 ″ on the conveying roller 74 is passed through the core grooved device 10C. In addition, it is good to provide the roller 74a which hold | suppresses and guides a square metal tube from the top before and after the apparatus 10C with a core groove.
Similarly to the above, when the rectangular metal tube 8 ″ without the concave groove passes through the grooved portions 76, 76 of the core grooving device 10C, each tube wall (four-side plate) 8c of the rectangular metal tube 8 ″ is The grooved metal tube 8 formed with the concave groove 8a as shown in FIG. 13 (a) is formed in such a manner that the groove is successively deepened by the convex portion 47a of the convex portion roller 47 and the concave portion 48a of the concave portion roller 48, respectively. can get.
In addition, when forming a concave groove at intervals, or partially forming a concave groove, it is possible to raise the convex roller 47 at a place where the concave groove is not formed (separate from the concave roller 48). it can.

When the above-described rolling adjustment mechanism using the fixed disk 63 and the rotating disk 64 is applied to the spherical core grooving device described with reference to FIGS. 3 and 4, as shown in FIG. A fixed disk 63 ′ is used as a housing body that accommodates the spherical convex 56 provided. A rotating disk 64 ′ that can turn around the fixed disk 63 ′ is provided, and a link plate 66 ′ is disposed in a space between the upper surface of the spherical convex mold 56 and the grooved portion 65 ′ of the rotating disk 64 ′. .
With this configuration, it is possible to switch between the rolled-down state and the released state of the spherical body 55 of the spherical convex 56 as described above.

In the above-described embodiment, the grooved rectangular metal tube (the grooved rectangular metal tube of FIG. 14 (a)) has been described. However, the present invention is not limited to this, and for example, the grooved pentagonal metal tube shown in FIG. A grooved polygonal metal tube such as the grooved hexagonal metal tube shown in 14 (c) can be manufactured. In addition to the square shape, a grooved circular metal tube having four grooves shown in FIG. 14 (d), a grooved circular metal tube having six grooves shown in FIG. 14 (e), and the like can be manufactured. .
Further, as shown in FIG. 14 (F), a rectangular metal tube (polygonal metal tube) with a corner groove having a groove in the corner portion can be manufactured. For example, as shown in FIG. A rectangular metal tube (polygonal metal tube) having a plurality of grooves such as two on one side can also be manufactured.

1 Metal plate 8, 8 'Grooved metal tube 8 "Pre-grooved rectangular metal tube 8a (continuous in the longitudinal direction of the tube) Concave groove 8b (formed at intervals in the longitudinal direction of the tube) Concave groove 8c Tube wall (4 plates of pipes)
10 (10A) Core grooving device 10 (10B, 10B ′) (Spherical type) Core grooving device 10 (10C) Core grooving device (when installed offline) 13 Impeder Core 14 connecting rod (rod or wire)
15 Fixing portion 16 Housing 16a Housing body 16b Base plate 16c Lid bodies 19, 39, 49 Extra-bore mechanism 20 Core (concave die)
20a Recess (recess material)
21 Adjustment bolt 25 Rod 26 Frame plate 31, 41 Frame 32, 42, 76 Grooving portion 37, 47 Convex portion roller 37a, 47a Convex portion 48 Concavity roller 48a Concavity 54 Receiving portion 54a Concave spherical surface seat 54b Receiving portion Body 54c Lid 55 Sphere (Externally rotating body)
56 Spherical convex 62 (outside tube mechanism) Roller frame 63, 63 'Fixed disk
64, 64 'rotating disk 65, 65' groove processing part 66, 66 'link plate

Claims (8)

A metal plate is bent into a substantially circular shape with a breakdown roll and a fin pass roll, and then, with a squeeze roll and a welding device, both edges of the substantially circular bent metal plate are butt welded into a circular pipe, and then a sizing roll A grooved metal tube manufacturing method for manufacturing a grooved metal tube by an electric resistance tube manufacturing apparatus shaped by
After passing through the sizing roll, an extra-tube rotating mechanism having a plurality of extra-tube rotating bodies having convex portions that press the outer surface of the pipe at intervals in the circumferential direction; The circumferential direction of the outer surface of the metal tube that has passed through the sizing roll by the plurality of outer tube rotating bodies and the plurality of recess members of the core grooving device including a core having a plurality of recess members that receive corresponding portions. A grooved metal tube manufacturing method, comprising: forming a groove extending in the longitudinal direction of the tube at a plurality of positions spaced apart from each other.   A rod-shaped or linear body rear end portion is directly or indirectly connected to a fixed portion disposed inside the substantially circular curved metal plate in the fin pass roll region, and the rod-shaped or linear body has a distal end portion connected thereto. 2. The method for manufacturing a grooved metal tube according to claim 1, wherein the core is attached.   When the welding device is a high frequency induction heating type welding device, the rear end portion of the rod-like or linear body is connected to the tip portion of an impeder core that constitutes a part of the welding device. The manufacturing method of the metal tube with a groove | channel of Claim 2.   The extra-rotary body of the extra-tube mechanism is a sphere that is rotatably held by a seat portion, and the recess material of the core is a recess die having a recess corresponding to the sphere. The manufacturing method of the metal tube with a groove | channel of any one of Claims 1-3.   The outer tube rotating body of the outer tube mechanism is a convex roller having the convex portion on the outer surface of a cylindrical body, and the concave portion of the core has a concave portion corresponding to the convex portion of the convex roller. The grooved metal tube manufacturing method according to any one of claims 1 to 3, wherein the grooved metal tube is a roller or a concave die. A method for manufacturing a grooved metal tube, in which a circular tube manufactured by an electric sewing tube manufacturing apparatus is provided with a groove extending in the longitudinal direction of the tube at a plurality of locations spaced in the circumferential direction of the outer surface of the tube,
An extra-tube mechanism having a plurality of outer-rotating bodies having projections that press the outer surface of the pipe, spaced apart in the circumferential direction, and a plurality of recesses that are disposed in the pipe and receive locations corresponding to the respective outer-rotating bodies. Using a core grooving device with a core having a member,
The metal tube is moved relative to the core grooving device, and the tube length is set at a plurality of locations spaced in the circumferential direction of the outer surface of the metal tube by the plurality of outer tube rotating bodies and the plurality of recessed members. A method of manufacturing a grooved metal tube, comprising forming a groove extending in a hand direction. A metal plate is bent into a substantially circular shape by a breakdown roll and a fin pass roll, and then both edges of the substantially circular bent metal plate are butt welded to each other with a squeeze roll and a welding device to form a circular pipe, and then a sizing roll. An apparatus for manufacturing a grooved metal tube that manufactures a grooved metal tube that forms concave grooves extending in the longitudinal direction of the pipe at a plurality of locations spaced in the circumferential direction of the outer surface of the pipe by the electric sewing tube manufacturing apparatus for shaping,
An extra-tube mechanism having a plurality of outer-rotating bodies having projections that press the outer surface of the pipe, spaced apart in the circumferential direction, and a plurality of recesses that are disposed in the pipe and receive locations corresponding to the respective outer-rotating bodies. A core grooving device including a core having a member is installed on the downstream side of the sizing roll, and the rear portion of the core is disposed inside the substantially circular curved metal plate in the fin pass roll region. An apparatus for producing a grooved metal tube, characterized in that it is connected to a distal end portion of a rod-like or linear body in which a rear end portion is directly or indirectly connected to the fixed portion. An apparatus for manufacturing a grooved metal tube that forms a groove extending in the longitudinal direction of a pipe at a plurality of locations spaced in the circumferential direction of the outer surface of the pipe on a circular pipe manufactured by an electric sewing pipe manufacturing apparatus,
An extra-tube mechanism having a plurality of outer-rotating bodies having projections that press the outer surface of the pipe, spaced apart in the circumferential direction, and a plurality of recesses that are disposed in the pipe and receive locations corresponding to the respective outer-rotating bodies. A grooved metal tube comprising: a core grooving device including a core having a member; and a relative movement mechanism for relatively moving the metal tube and the core grooving device. apparatus.

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