JPH0780960A - Corrugated pipe producing apparatus - Google Patents

Abstract

PURPOSE:To produce a corrugated pipe having a slit formed thereto easily, rapidly and inexpensively by arranding a cam plate subjecting a cutter blade to advance and retreat operation in a freely rotatable manner independently of a hollow shaft and providing rotary gears rotationally driving the cutter blade and the cam plate so as to be different in the number of teeth. CONSTITUTION:A base frame 23 is arranged so as to be moved in synchronous relation to the feed-out speed of the member 3 to be processed from a molding apparatus and the hollow shaft 26 holding the member 3 to be processed is arranged on the base frame 23 in a freely rotatable manner. The hollow shaft 26 is attached to a cutter plate 31 and the cutter blade 39 cutting the member 3 to be processed is arranged on the center side of the cutter plate 31 in the radius direction of the cutter plate 31. The cam plate 33 subjecting the cutter blade 39 to advance and retreat operation is arranged on the outer periphery side of the cutter plate 31 in a freely rotatable manner independently of the hollow shaft 26. The rotary gear 30 rotationally driving the cutter plate 31 and the rotary gear 31 rotationally driving the cam plate 33 are provided so as to be different in the number of teeth and a gear mechanism transmitting rotatory power to the rotary gears 30, 31 is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated pipe manufacturing apparatus, and more particularly to a corrugated pipe manufacturing apparatus having longitudinal slits for covering the outer circumference of a pipe or the like.

[0002]

2. Description of the Related Art Conventionally, the surface of a pipe or the like has been covered with a cover such as a heat insulating material, and such a cover protects the pipe or the like.

As a means for attaching a cover to such a pipe, conventionally, for example, a sheet-metal processed iron plate is wound around the outer periphery of the pipe, and then the surface of the iron plate is coated as a rust preventive treatment. There is something. Further, as another means, there is a method in which a styrofoam or the like is wrapped around the pipe and then a tape or the like is wrapped around the styrofoam to fix the styrofoam.

However, in the cover mounting means using the iron plate, it is necessary to cut and bend the iron plate according to the bent shape of the pipe at the place where the pipe is installed. Since the winding work and the like must be performed, the workability is extremely poor and the cover mounting work cannot be performed efficiently.

Therefore, as a method of rationalizing such conventional means such as sheet metal working of an iron plate, anticorrosive treatment or tape winding, a corrugated pipe has been conventionally used.

This corrugated tube is formed into a substantially long cylindrical shape from a single material or a composite material of metal strips and metal foils, for example, and the surface of the corrugated tube has spiral irregularities. And a slit is formed along the longitudinal direction.

The corrugated pipe can be easily covered by expanding it from the slit portion and covering the outer periphery of a predetermined pipe, and the corrugated pipe is bent by the spiral irregularities. It can be easily performed, and the corrugated pipe can be properly aligned with the shape of the pipe.

In the case of producing such a corrugated pipe, conventionally, for example, a metal strip or the like is spirally wound, and when a single material is used, the wound portions are partially overlapped and the overlapped portion is used. Is attached to form a long cylindrical shape. When using a composite material,
The upper winding material and the lower winding material are offset from each other and wound and adhered to form a cylindrical shape. After that, slits are formed along the longitudinal direction on the outer periphery of the corrugated tube thus formed in a cylindrical shape.

[0009]

However, in the above-mentioned conventional corrugated pipe manufacturing means, since the slit is formed in the corrugated pipe once formed into a cylindrical shape, the length of the corrugated pipe becomes long. However, it is extremely difficult to form slits linearly and uniformly, and when forming slits in a corrugated tube made of a material that is easily deformed, it is necessary to carefully perform the forming work, and the workability is extremely poor. However, there is a problem that the corrugated pipe cannot be easily manufactured.

When the single material is wound,
Since it is necessary to provide the overlapped portion of the material, there is a problem that the amount of waste of the material becomes extremely large and the manufacturing cost increases.

The present invention has been made in view of the above points, and it is possible to easily and quickly manufacture a corrugate in which a slit is formed, and at the same time, it is possible to manufacture inexpensively without waste of material. It is an object of the present invention to provide a corrugated pipe manufacturing apparatus.

[0012]

In order to achieve the above object, in the corrugated pipe manufacturing apparatus according to the present invention, a spiral member is formed on a peripheral surface of a work member made of a predetermined material such as metal or resin. In a corrugated pipe manufacturing apparatus for manufacturing a corrugated pipe in which a slit is formed in the axial direction while being formed in a cylindrical shape, a cylinder in which a flat workpiece is bent to form a slit in an outer peripheral portion. In addition to disposing a carry-in guide that bends in a circular shape, a cylindrical guide that holds the workpiece that has been curved by this carry-in guide so as not to rotate is disposed, and a rotary cylinder is provided on the workpiece discharge side of the cylindrical guide. Is rotatably disposed, the sun screw located inside the member to be processed is rotatably disposed independently of the rotary drum at the center of the rotary drum, and the sun screw is disposed inside the rotary drum. And a molding device in which a plurality of planetary screws that make spiral irregularities on the outer periphery of the workpiece are rotatably arranged by contacting the outer periphery of the workpiece through the workpiece, and the planetary screw is fed from the molding device. An underframe that is moved in synchronism with the delivery speed of the processed member to be processed, and a hollow shaft that holds the processed member inside is rotatably disposed on the underframe, and the hollow shaft is a cutter. While installing the plate integrally,
A cutter blade that projects toward the center of the cutter plate and cuts the member to be processed is provided on the cutter plate so as to advance and retract in the radial direction of the cutter plate, and the cutter blade moves forward and backward on the outer peripheral side of the cutter plate. A cam plate is rotatably provided independently of the hollow shaft, and a rotary gear for rotationally driving the cutter plate and a rotary gear for rotationally driving the cam plate are provided with different numbers of teeth. And a cutting device provided with a gear mechanism for transmitting a rotational force.

[0013]

According to the corrugated pipe manufacturing apparatus of the present invention, a flat work piece made of a predetermined material such as metal or resin is inserted from the carry-in guide of the molding apparatus to form a cylinder having a slit in the outer peripheral portion. The workpiece to be bent in a circular shape and held so as not to rotate via a cylindrical guide is sent between the sun screw and the planetary screw, and the sun screw and the planetary screw form spiral irregularities, and thereafter. , The workpiece sent from the molding device is inserted into the hollow shaft of the cutting device, and the underframe is projected from the hollow shaft by a predetermined length, and the underframe is synchronized with the feed speed of the workpiece. While moving, the rotary gears are rotationally driven via the gear mechanism to rotate the cutter plate and the cam plate, respectively. In this case, since the number of teeth of each rotary gear is formed differently, the rotational positions of the cutter plate and the cam plate are displaced, which causes the cutter blade to move toward the center of the cutter plate. The cutter blade cuts the member to be processed.

[0014]

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

The corrugated pipe manufacturing apparatus according to the present invention is
It has a corrugated pipe molding device 1 and a cutting device 2, respectively.

FIGS. 1 to 3 show one embodiment of the corrugated pipe molding apparatus 1. The molding apparatus 1 for molding a predetermined workpiece 3 as a corrugated pipe is installed on a base 4. The base plate 5 is provided with a pair of supports 6 standing upright at both ends of the base plate 5 so as to be orthogonal to the direction in which the workpiece 3 is carried in. Further, a holding plate 7 whose tip ends extend to both sides of each of the supports 6 is integrally fixed to an upper portion of each of the supports 6, and the tip of each of the holding plates 7 is provided downward. The extending suspension plate 8 is fixed. A solar screw 9 having a spiral line formed on the outer peripheral surface is rotatably supported between the respective hanging plates 8 so as to penetrate through the central portion of each of the support bodies 6, and A flexible wire 10 that is connected to a rotary drive source (not shown) and drives the sun screw 9 to rotate is connected to the end of the workpiece 3 on the loading side.

A cylindrical rotary drum 11 is rotatably supported on the outer peripheral side of the sun screw 9 and between the supports 6, and the outer peripheral surface of the rotary drum 11 is rotatable. ,
Drive belt 1 rotated by a drive device (not shown)
A plurality of V-shaped drive grooves 13 with which 2 engages are circumferentially provided. Furthermore, on the outer peripheral side of the sun screw 9, a plurality of (three in this embodiment) planetary screws 14, 1 are provided.
4 ... are arranged, and each of these planetary screws 14 is
It is rotatably supported by a shaft support plate 15 attached to the end surface of the rotary drum 11. In addition, each of the planetary screws 14
Has a spiral line in the opposite direction to the sun screw 9, and the planet screw 14 has a taper shape so that the end thereof has a small diameter on the loading side of the workpiece 3. Has been done. Then, a spiral unevenness is formed on the workpiece 3 sent between the planet screw 14 and the sun screw 9, and the workpiece is processed depending on the direction of the spiral line between the sun screw 9 and the planet screw 14. The members 3 are sequentially delivered.

Further, the processed member 3 of the solar screw 9 is
A cylindrical cylindrical guide 17 held by the support legs 16 on the base 4 is arranged on the outer periphery of the carrying-in side of the, and the inner peripheral surface of the cylindrical guide 17 is minute with respect to the workpiece 3. Are formed so as to have a gap.

Further, a carry-in guide 18 is connected to the carry-in side end of the cylindrical guide 17, and the carry-in guide 18 is formed in a substantially U-shape with its top surface open. At the same time, it is formed so as to gradually become annular as it reaches the connecting portion of the cylindrical guide 17. Positioning projections 19 for positioning both side portions of the workpiece 3 are formed at both edge portions of the carry-in guide 18 so as to extend in the carry-in direction. Is slightly inclined downwards toward the connecting part of. This inclination angle differs depending on the size of the diameter when the workpiece 3 is formed into a cylindrical shape, so that the inclination angle is appropriately set according to the diameter of the workpiece 3. .

Further, on the inner peripheral surface of the upper portion of the cylindrical guide 17, a stopper piece 20 for preventing twisting of the workpiece 3 inserted from the carry-in guide 18 and bent into a cylindrical shape is axially formed. The stopper piece 20 is arranged so as to extend, and the lower end portion of the stopper piece 20 contacts the outer peripheral surface of the sun screw 9.

Further, a holding ring 21 for holding the workpiece 3 discharged from the planetary screw 14 is arranged on the outer periphery of the other end of the sun screw 9, and the holding ring 21 allows the holding ring 21 to move in the longitudinal direction. The threads are prevented from jumping due to the frictional force of the workpiece 3 discharged in the state where the slits are formed.

FIGS. 4 to 6 show an embodiment of the corrugated pipe cutting device 2, which is shown in FIG.
Is an underframe 2 having wheels 22 rotatably attached to the lower surface side.
3, the support frame 24, which is inclined inward and is formed so as to rise upward, is integrally fixed to both sides of the upper surface of the underframe 23. A cylindrical support ring 25 is attached to the upper part of the support frame 24, and a cylindrical hollow shaft 26 rotates at the center of the support ring 25 and the position coaxial with the sun screw 9 of the molding apparatus 1. Freely supported.

Inside the hollow shaft 26, the workpiece 3 discharged from the sun screw 9 of the molding apparatus 1 is processed.
A core holding member 27 for holding the inner peripheral surface of the hollow shaft 26 is disposed so as to have a predetermined gap with respect to the inner peripheral surface of the hollow shaft 26 and penetrate the hollow shaft 26. A rotation stopper 28 extending upward and preventing twisting of the workpiece 3 is integrally fixed to the upper end of the loading side end of the workpiece 3. This rotation stopper 2
The upper part of 8 is connected to the upper part of the support ring 25, so that the core holding member 27 is held at an appropriate position via the rotation stopper 28. Further, the other end portion of the core holding member 27 is formed with a small diameter portion 29 having a slightly small diameter.

A first rotary gear 30 is coaxially fixed to the end of the hollow shaft 26 on the work-in side of the workpiece 3, and the other end of the hollow shaft 26 has a cutter plate 31. Is stuck. A second rotary gear 32 is rotatably supported on the hollow shaft 26 on the outer peripheral side of the hollow shaft 26 and between the support ring 25 and the cutter plate 31. A cam plate 33 having an outer peripheral edge located on the outer peripheral side of the cutter plate 31 is fixed to the second rotary gear 32, and a cam surface 34 having a predetermined shape is formed on the inner peripheral edge of the cam plate 33. ing. Further, in this embodiment, the first rotary gear 30 and the second rotary gear 32 are
Both have two modules, and are provided with a difference such that the number of teeth of the second rotary gear 32 is increased by one pitch with respect to the first rotary gear 30, whereby the first rotary gear 30 is provided. And between the second rotary gear 32 and about 5
There is a pitch difference of °.

On both sides of the cutter plate 31, three guide recesses 3 extending in the radial direction of the cutter plate 31 are provided.
5 are formed so as to be spaced at equal angular intervals in the circumferential direction, and the guide recess 35 on the discharge side surface of the workpiece 3 of the cutter plate 31 is formed from the outer peripheral portion to the central portion of the cutter plate 31. And the guide recess 35 on the other side.
Are formed only from the outer peripheral portion of the cutter plate 31 to the middle portion in the radial direction. A notch 36 having a width smaller than that of the guide recess 35 and extending from the outer peripheral portion of the cutter plate 31 to the position where the guide recess 35 on the other side is formed is formed inside each guide recess 35 of the cutter plate 31. And
A storage hole 37 extending to the center of the cutter plate 31 is formed on the end surface of the notch 36.

Further, a cutter holding plate 38 having a V-shaped cross section is provided in each of the notches 36 so that both side edges of the cutter holding plate 38 are located on the front side of each of the guide recesses 35. The cutter holding plate 38 is guided by the guide recess 35 and is movable in the radial direction of the cutter plate 31. Further, the guide recess 35 formed up to the center of the cutter plate 31 of the cutter holding plate 38.
The side extends to the center, and this cutter holding plate 3
A cutter blade 39 having an acute-angled tip is attached to the tip of the extended portion of 8 by a cutter holding member 40. A spring 41 for urging the cutter holding plate 38 in the outer peripheral direction of the cutter plate 31 is housed inside the housing hole 37, and a base end portion of the cutter holding plate 38 is
The cam surface 3 of the cam plate 33 is urged by the urging force of the spring 41.
A roller 42 abutting against the roller 4 is rotatably attached. Then, from the state in which the cutter holding plate 38 is biased to the outer peripheral side of the cutter plate 31 by the biasing force of the spring 41, the cam surface 34 of the cam plate 33 resists the biasing force of the spring 41 and holds the cutter. When the plate 38 is moved to the center side, the cutter blade 39 is projected to the small-diameter portion 29 of the core holding member 27, so that the workpiece 3 is cut.

Further, above the underframe 23, a long moving screw 43 having a peripheral surface formed with a screw and extending in the moving direction of the underframe 23 is rotatably driven. The moving screw 43 is rotationally driven in synchronization with the sun screw 9 in the present embodiment. A drive member 45 having a U-shaped receiving groove 44 with which the moving screw 43 is engaged is attached to the central portion of the upper surface of the underframe 23.
Has a lower surface formed in an arc shape similar to the peripheral surface of the moving screw 43, and a screw which is screwed into the screw of the moving screw 43 in a closed state is formed on the lower surface of the receiving groove 44. A drive plate 46 is provided.

A drive gear 47 having the same number of teeth as the first rotary gear 30 is coaxially attached to one end of the moving screw 43.
An elongated fixed transmission gear 48 extending along the moving screw 43 is meshed with this. Further, a first transmission gear 49 for transmitting a rotational force to the first rotary gear 30 is meshed with the fixed transmission gear 48 so as to be able to come into contact with and separate from the fixed transmission gear 48, and a first transmission gear 49 for transmitting the rotational force to the second rotary gear 32 is transmitted. The two transmission gears 50 are meshed with each other so that they can be brought into and out of contact with each other. Further, on the underframe 23, the movement of the drive plate 46 to and from the moving screw 43 and the first transmission gear 49 and the second transmission gear 50 are performed.
A drive cylinder 51 for performing the contacting / separating operation is disposed, and the underframe 23 is provided with a return cylinder 52 for moving the underframe 23 moved by the operation of the moving screw 43 to the original position. It is set up.

Next, the operation of this embodiment will be described.

First, the molding process of the member 3 to be processed by the molding apparatus 1 will be described.

First, the drive belt 12 is rotationally driven by the drive device, and the rotary drum 1 is driven through the drive groove 13.
1, the planetary screws 14 are rotationally driven by the rotation of the rotary cylinder 11. On the other hand, the sun screw 9 is rotationally driven via the flexible wire 10 by the rotary drive source.

In this state, for example, a predetermined work piece 3 made of, for example, a flat metal strip, a metal foil or a composite material thereof, or a resin film or a composite material thereof is positioned from the carry-in guide 18 at both side portions thereof for positioning projections. When the workpiece 3 is inserted in a substantially U-shaped cross-section so as to come into contact with the guide 19, the workpiece 3 is gradually bent while being guided by the carry-in guide 18 into a cylindrical shape having a slit formed in the upper portion thereof. It is inserted between the sun screw 9.

At this time, the stopper piece 2 of the cylindrical guide 17
Since 0 is engaged with the slit portion of the workpiece 3, it is possible to prevent the workpiece 3 from being twisted. Then, the cylindrical member 3 to be processed is conveyed along the outer periphery of the sun screw 9 in the axial direction of the sun screw 9 and inserted into each planet screw 14. In this case, each planet screw 1
Since the loading side of 4 is tapered so that its end has a small diameter, the workpiece 3 is attached to the planet screw 1
4 can be easily inserted inside.

As a result, the workpiece 3 is held between the sun screw 9 and each planet screw 14,
The spiral line formed on the sun screw 9 and the spiral line formed on the planetary screw 14 form spiral irregularities on the surface of the workpiece 3. Then, the processed member 3 after the molding is sequentially fed by the rotation of the sun screw 9, and is discharged from the molding apparatus 1 through the holding ring 21.

Next, the cutting process by the cutting device 2 of the workpiece 3 molded by the molding device 1 will be described.

First, by the rotational drive of the sun screw 9, the moving screw 43 and the drive gear 47 are rotationally driven in synchronization with the sun screw 9. On the other hand, the roller 42 of the cutter holding plate 38 is connected to the cam surface 3 of the cam plate 33.
The cutter holding plate 38 is urged toward the outer peripheral direction of the cutter plate 31 by the urging force of the spring 41, and in this state, the cutter blade 39 is located at the lowest point.
Are held so as not to project toward the center of the cutter plate 31.

The processed member 3 molded by the molding apparatus 1 is inserted between the hollow shaft 26 of the support ring 25 and the core holding member 27, and twisting is prevented by the rotation stopper 28 as the molding progresses. Meanwhile, it is fed so as to gradually project from the cutter plate 31 side.

When the workpiece 3 projects a desired length from the end face of the cutter plate 31, the drive cylinder 51 is operated to engage the drive plate 46 with the moving screw 43 and the first transmission gear. 49 and the second transmission gear 50 are meshed with the first rotary gear 30 and the second rotary gear 32, respectively. Accordingly, the rotation of the drive gear 47 causes the fixed transmission gear 48 and the first transmission gear 49,
The first rotary gear 30 and the second rotary gear 32 are rotationally driven via the second transmission gear 50, and the underframe 23 is moved in the axial direction of the moving screw 43 via the drive plate 46 by the rotation of the moving screw 43. Be moved.

In this state, the hollow shaft 26 and the cutter plate 31 are rotationally driven via the first rotary gear 30, and the cam plate 33 is rotationally driven via the second rotary gear 32. In this case, in the present embodiment, since the number of teeth of the second rotary gear 32 is increased by one pitch with respect to the first rotary gear 30, the drive gear 47 makes one rotation, The first rotary gear 30 is rotated once, but the second rotary gear 32 is displaced by one pitch (5 °). That is, the hollow shaft 26 and the cutter plate 31 rotate once by one rotation of the first rotary gear 30, but the cam plate 33 driven by the second rotary gear 32 is displaced in position, and the cutter plate 31 is held by the cutter. Board 3
The position of the cam surface 34 of the cam plate 33 is displaced with respect to the roller 42 of No. 8 so that the cutter holding plate 38 is gradually moved to the center side of the cutter plate 31 against the biasing force of the spring 41. . Then, when the roller 42 of the cutter holding plate 38 is located at the uppermost part of the cam surface 34 of the cam plate 33, the cutter holding plate 38 is moved to the most center side of the cutter plate 31, whereby the cutter blade 39 is aligned. It projects from the small diameter portion 29 of the holding member 27 and cuts the workpiece 3.

Thereafter, the drive cylinder 51 is operated to release the engagement of the drive plate 46 with the moving screw 43, whereby the movement of the underframe 23 is stopped, and the first transmission gear 49 and the second transmission gear are transmitted. By releasing the meshing of the gear 50 with the first rotary gear 30 and the second rotary gear 32, the rotation of the first rotary gear 30 and the second rotary gear 32 is also stopped. Then, by operating the return cylinder 52, the underframe 23 is returned to the original position.

By repeating such a series of operations, the molded member 3 can be cut into a desired length.

Therefore, in the present embodiment, the flat plate-shaped workpiece 3 is bent by the molding apparatus 1 into a cylindrical shape having slits, and the workpiece is processed by the sun screw 9 and the planetary screw 14. While forming spiral irregularities on the outer periphery of the member 3, the underframe 23 is cut by the cutting device 2.
The cutter plate 31 is moved through the first rotary gear 30 while moving the workpiece in synchronization with the workpiece 3 delivered from the molding apparatus 1.
And the cam plate 33 is rotationally driven via the second rotary gear 32.
The position of the cam surface 34 of the cam plate 33 is displaced with respect to the cam plate 33, so that the cutter holding plate 38 gradually moves toward the cutter plate 31.
The cutter blade 39 is moved toward the center of the core holding member 27 so as to project to the small diameter portion 29 of the core holding member 27 to cut the workpiece 3, so that a material that is easily deformed or the workpiece 3 is used. Even if the length of the corrugated tube becomes longer, the corrugated tube with the uniform slits and the spiral irregularities on the peripheral surface can be easily and quickly manufactured, and the cutting By the device 2, it is possible to appropriately cut the workpiece 3 at any position, and it is possible to remarkably improve the manufacturing work efficiency. In addition, since the flat plate-shaped member 3 is bent, it is not necessary to provide the overlapping portion of the material as in the conventional case, waste of the material can be omitted, and the manufacturing can be performed at low cost.

The present invention is not limited to the above-mentioned embodiment, but can be variously modified if necessary.

[0044]

As described above, in the corrugated pipe manufacturing apparatus according to the present invention, the solar screw and the planetary gear are formed in a state where the flat member to be processed is bent into a cylindrical shape having slits by the molding apparatus. The screw forms a spiral unevenness on the outer periphery of the member to be processed, and the cutting device can cut the member to be processed sent from the molding device at any position. Even if a material is used or the length of the work piece becomes long, slits are formed uniformly and a corrugated tube with spiral irregularities is easily and quickly formed on the peripheral surface. It can be manufactured, and moreover, it can be cut appropriately at an arbitrary position of the member to be processed by the cutting device, and the manufacturing work efficiency can be remarkably enhanced. Also,
Since the plate-shaped member to be processed is bent, it is not necessary to provide the overlapping portion of the material as in the conventional case, and it is possible to reduce the waste of the material and to produce it at low cost.

[Brief description of drawings]

FIG. 1 is a front view of a molding apparatus showing an embodiment of a corrugated pipe manufacturing apparatus according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is a front view of a cutting device showing an embodiment of an apparatus for manufacturing a corrugated pipe according to the present invention.

5 is a plan view of FIG.

6 is a side view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding apparatus 2 Cutting device 3 Workpiece member 9 Solar screw 11 Rotating cylinder 14 Planetary screw 17 Cylindrical guide 18 Carrying-in guide 20 Stopper piece 21 Holding ring 23 Underframe 25 Support ring 26 Hollow shaft 27 Core holding member 28 Rotation stop 30 1st Rotating gear 31 Cutter plate 32 Second rotating gear 33 Cam plate 34 Cam surface 38 Cutter holding plate 39 Cutter blade 43 Moving screw 47 Drive gear 48 Fixed transmission gear 49 First transmission gear 50 Second transmission gear 51 Drive cylinder

Claims (1)

[Claims] 1. A corrugated pipe in which a member to be processed made of a predetermined material such as metal or resin is formed into a cylindrical shape having spiral irregularities on its peripheral surface, and a slit is formed in the axial direction thereof. In the corrugated pipe manufacturing apparatus for bending, a flat-shaped member to be processed is provided with a loading guide that is bent into a cylindrical shape with a slit formed in the outer periphery, and is bent by this loading guide. A cylindrical guide for holding the member to be processed so as not to rotate is arranged, a rotary cylinder is rotatably arranged on the side of the cylindrical guide to carry out the member to be processed, and the inside of the member to be processed is provided at the center of the rotary cylinder. A sun screw located at a position rotatably independently of the rotary drum, and contacts the outer periphery of the sun screw inside the rotary drum via the workpiece to form a spiral around the outer periphery of the workpiece. Irregularities A molding device in which a plurality of planetary screws forming the above is rotatably arranged, and an underframe that is moved in synchronism with the sending speed of the processed member sent out from the molding device are provided. A rotatably arranged hollow shaft for holding the member to be processed inside, a cutter plate is integrally attached to the hollow shaft, and the member to be processed is projected on the cutter plate toward the center of the cutter plate. A cutter blade for cutting is arranged movably in the radial direction of the cutter plate, and a cam plate for moving the cutter blade forward and backward is rotatably arranged independently of the hollow shaft on the outer peripheral side of the cutter plate, The cutting device is provided with a rotary gear for rotationally driving the cutter plate and a rotary gear for rotationally driving the cam plate so as to have different numbers of teeth, and a gear mechanism for transmitting a rotational force to each rotary gear. Characterized by Apparatus for manufacturing a gate tube.