JP2003126916A - Production method and equipment for pipe with helical groove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent such deformation of pipes with a helical groove as becoming squared or flattened, etc., when a helical groove is formed on pipe materials by pressing forming rolls on the pipe materials and relatively rotating those. SOLUTION: A plurality of forming rolls to form a helical groove on a pipe material 3 are arranged on the outer circumference of the pipe material 3 in the circumferential direction of the pipe material 3 having a space each other. A pipe with a helical groove is produced by pressing several forming rolls in the centripetal direction of the pipe material 3, also relatively rotating the outer circumference of the pipe material 3, and relatively shifting it in the pipe axial direction. An outer circumferential shape holding member 10 which holds an outer circumferential shape of the formed helical groove is set between the forming rolls 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a spiral grooved tube and an apparatus for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a method for manufacturing a spiral grooved tube used for a heat exchanger tube of a heat exchanger of an automobile cooler, a plurality of forming rolls are formed by inclining their axial centers with respect to the tube axis. A method of rolling the pipe to form a spiral groove in the pipe by arranging the roll on the outer periphery, pressing the forming roll in the centripetal direction of the pipe and rotating relatively on the outer periphery of the pipe is disclosed in, for example, Japanese Patent Laid-Open No. 10-249445. It is disclosed as the prior art in the publication.

In this manufacturing method, as shown in FIG. 9, for example, three forming rolls 102 to
When arranging 104 and forming a spiral groove, the cross section of the pipe 101 is deformed as shown in FIG. 10 during rolling by the forming rolls 102 to 104 to form a square-shaped pipe product 106 having a square portion 105. There's a problem. This squeezing phenomenon occurs due to insufficient rigidity of the pipe, insufficient rigidity of the mechanical system including forming rolls and rolling mills, excessive reduction amount, excessive rolling speed, etc., and the shape of the squeezing is as shown in FIG. It becomes a triangle, a square shown in FIG. 11, or a polygon having more than that.

To solve this problem, Japanese Patent Laid-Open No. 10-
In the invention described in Japanese Patent No. 249445, as shown in FIG. 12, one forming roll 201 is provided with a circumferential extension tool part 20.
There has been proposed a method in which 2, 203 are arranged in two groups at a predetermined pitch, a non-rolled portion 204 is provided between the two groups, and a spiral groove is formed in the tube 205 by such a forming roll 201.

According to this method, even if the above problem is solved, there is a problem that the shape of the forming roll becomes very complicated as described above.

As another conventional technique, a die fitted to the outer peripheral surface of the pipe material is provided, one forming roll is provided inside the die, and a force applying member is provided at a position separated from the forming roll by a predetermined distance. Is provided and a spiral groove is formed in the pipe by a forming roller, and a force is applied to the spiral groove immediately after the formation by a force applying member to suppress the distortion of the pipe, for example, Japanese Patent Laid-Open No. 59-27740. It is disclosed in the publication.

[0007]

By the way, generally, in order to increase the accuracy of the spiral groove, a plurality of forming rolls are arranged at substantially equal intervals on the circumference of the pipe as shown in FIG. It is preferable to press this uniformly in the centripetal direction of the tube.

Therefore, in the method described in JP-A-59-27740, when it is attempted to arrange a plurality of rolls and force applying members, a plurality of dies must be arranged side by side in the tube axis direction. However, there is a problem that the device itself becomes complicated and large-scale.

Therefore, an object of the present invention is to provide a method and an apparatus for manufacturing a spiral grooved tube which solves the above problems.

[0010]

In order to solve the above-mentioned problems, a first invention according to claim 1 is that a plurality of forming rolls forming spiral grooves in a pipe material are arranged in a circumferential direction of the pipe material. They are arranged on the outer circumference of the tube material with a gap between them, and the plurality of forming rolls are pressed in the centripetal direction of the tube material and are relatively rotated around the outer circumference of the tube material and relatively moved in the tube axis direction. In the method for producing a spiral grooved tube by means of the above-mentioned method, the outer peripheral shape of the spiral grooved portion of the spiral grooved tube is held in the gap between the forming rolls. Is a manufacturing method.

According to the present invention, the spiral groove is accurately formed by the plurality of forming rolls, and the shape of the outer periphery of the spiral grooved portion in the pipe in which the spiral groove is formed is maintained in the gap between the adjacent forming rolls. Like, that is,
Since the outer peripheral surface of the spiral grooved part is prevented from being deformed,
Deformation of the spiral grooved portion such as squareness and flatness is prevented.

According to a second aspect of the present invention, in the first aspect of the present invention, the bending or twisting of the pipe shaft of the spiral grooved portion is prevented on the side where the spiral grooved portion is formed and emerges. It is a method of manufacturing a spiral grooved tube that is designed to be prevented.

In the present invention, when the spiral grooved portion formed by the forming roll comes out of the forming roll, the bending or twisting of the tube shaft of the spiral grooved portion is prevented.

According to a third aspect of the present invention, in the first or second aspect of the invention, the tube material is rotated by the tube material rotation driving means, and the molding is performed as the tube material is rotated. A method for manufacturing a spiral grooved pipe, wherein a forming tool having a roll and an outer peripheral shape holding member that holds the outer peripheral shape of the spiral grooved portion is moved in the pipe axis direction. The movement of the forming tool in the pipe axis direction means that the forming tool is driven in the pipe axis direction by a spiral configuration similar to the thread cutting action, or a drive that assists the forming tool in the follower movement. This means both applying a force to drive the forming tool in the tube axis direction.

In the present invention, since the tube material is driven to rotate and the molding tool is moved in the tube axis direction by the rotation of the tube material, the tube material has a short overall length, a small diameter, or a light weight. Moreover, the rotational driving force can be reduced, and the driving device can be made compact.

A fourth invention according to claim 4 is the method for manufacturing a spiral grooved pipe according to the third invention, wherein the forming tool is moved in a direction away from the rotary drive means for pipe material. is there.

In the present invention, one end of the tube material is held by the tube material rotation driving means, and the molding tool is moved in a direction away from the tube material rotation driving means, whereby the other end of the tube material is moved to the free end ( It can be in a free state). Therefore, when the pipe has an action of shrinking its entire length during the formation of the spiral groove, the pipe follows the action and the pipe is easily shrunk, and the thinning of the spiral groove portion does not occur.

According to a fifth aspect of the present invention, in the first or second aspect of the invention, an outer peripheral shape holding means for holding the outer peripheral shape of the forming roll and the spiral grooved portion by a forming tool rotation driving means. Rotate the forming tool with the member,
This is a method for manufacturing a spiral grooved tube in which the tube material moves in the tube axis direction with this rotation.

When the length of the pipe material is long (several meters) or heavy, the driving force can be made smaller by rotating the forming tool, and the driving device can be made compact. This is effective in such cases.

According to a sixth aspect of the present invention, in the first or second aspect of the invention, the outer peripheral shape is retained to prevent the tube material from rotating and retain the outer peripheral shapes of the forming roll and the spiral grooved portion. A method for producing a spiral grooved tube, wherein a molding tool having a member is rotated by a rotation driving means for a molding tool, and the molding tool is moved along with the rotation driving means for the molding tool in the axial direction of the tube along with the rotation.

The movement of the forming tool in the direction of the pipe axis means that the forming tool is driven in the direction of the pipe axis by the spiral structure similar to the thread cutting action, or the above-mentioned driven side is moved to the side of the forming tool. Is applied to drive the forming tool in the tube axis direction. Also in the present invention, the same operation and effect as those of the first and second inventions can be obtained.

According to a seventh aspect of the present invention, a plurality of forming rolls forming spiral grooves in the pipe material are arranged on the outer periphery of the pipe material with gaps in the circumferential direction of the pipe material. ,
The plurality of forming rolls are pressed in the centripetal direction of the tube material, and the outer circumference of the tube material is relatively rotated and relatively moved in the tube axis direction to form a spiral grooved tube in an apparatus. The apparatus for manufacturing a spiral grooved pipe is characterized in that an outer peripheral shape holding member that holds the outer peripheral shape of the spiral grooved portion is arranged in the gap between the forming rolls.

According to the present invention, the same operation as that of the first invention is exhibited.

According to an eighth aspect of the present invention, in the seventh aspect of the present invention, the bending or twisting of the tube shaft of the spiral grooved portion on the side where the spiral grooved portion is formed and emerges. It is an apparatus for manufacturing a spiral grooved tube provided with a guide for preventing.

According to the present invention, the same operation as that of the second invention is exhibited.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described based on the embodiments shown in FIGS.

1 and 3 show a first embodiment.

In FIG. 1, a tube material rotation driving means 2 composed of a lathe, an electric drill and the like is fixed on a base 1, and the tube material 3 is detached from the tip of the tube material rotation driving means 2. A chuck 4 for holding the chuck 4 is provided. Then, one end of the tube material 3 is held by the chuck 4, and the tube material 3 is rotated about the tube axis by the tube material rotation driving means 2. In addition, the above tube material 3
Are held and rotated by the chuck 4 in a state of being arranged in the horizontal direction.

A guide 5 for movement is provided on the base 1 in parallel with the axis of the tube material 3 held by the chuck 4, and a spiral groove is formed on the guide 5. The forming tool 6 is provided so as to be freely movable in the tube axis direction.

The forming tool 6 mainly comprises a forming roll 7, a roll position adjusting member 8, an adjusting driving means 9 for driving the roll position adjusting member 8, an outer peripheral shape holding member 10, a cylindrical inlet guide 11, and a cylinder. The outlet guide 12 has a shape of a circle.

Next, each component of the forming tool 6 will be described.

The forming roll 7 has an arm 13 as shown in FIG.
Is rotatably supported by a horizontal support shaft 14, and the support shaft 14 is arranged so as to be inclined with respect to the axis of the pipe material 3 to be mounted, and the forming roll 7 is attached to the pipe wall of the pipe material 3. The spiral groove is formed in the tube material 3 by being pressed against the tube material 3 and rotating relative to the tube material 3. The forming roll 7
In the illustrated embodiment, two pieces are arranged so as to face the outer circumference of the tube material 3, but three or more pieces may be provided. Such a plurality of forming rolls 7 are preferably arranged at equal intervals in order to improve the balance at the time of forming. For example, in the case of three forming rolls, they are arranged at 120 ° intervals.

A guide shaft 16 is erected on the frame 15 of the forming tool 6 in a direction orthogonal to the axis of the tube material 3, and the guide shaft 1
6, a pair of moving members 17 is slidably provided.
Then, the arm 13,
13, the pair of moving members 17, 17 are brought relatively close to each other in FIG. 2, so that both forming rolls 7, 7 move in the centripetal direction of the tube material 3 via the arms 13, 13.
By moving the pair of moving members 17, 17 in the direction in which they are relatively separated from each other in FIG. 2, both of the forming rolls 7, 7 are moved in the direction opposite to the centripetal direction of the tube material 3 via the arms 13, 13. ing.

The roll position adjusting member 8 moves the two forming rolls 7 and 7 at the same time and by an equal amount. In the embodiment shown in the drawing, the roll position adjusting member 8 is formed in a pantograph shape, and the link node portion 18 is formed on both sides. It is connected to the moving members 17, 17.

The adjusting drive means 9 comprises a rod 20 connected to a node portion 19 at the upper part of the pantograph and a drive portion 21 such as a screw type or hydraulic cylinder for moving the rod 20 up and down (reciprocating). By moving the rod 20 upward, the pantograph-type roll position adjusting member 8 is closed, and the two forming rolls 7 and 7 are simultaneously and in equal amounts.
By moving the tube material 3 in the centripetal direction and moving the rod 20 downward, the pantograph type roll position adjusting member 8 is opened, and the two forming rolls 7 and 7 are simultaneously and
The pipe material 3 is moved by an equal amount in the direction opposite to the centripetal direction.

The outer peripheral shape holding member 10 is formed in a plate shape and is arranged between the adjacent forming rolls 7 as shown in FIGS. 2 and 3, and in the example shown in FIG. They are arranged facing each other. The outer peripheral shape holding member 1
0 is arranged in the radial direction from the axis of the tube material 3, and its outer end is fixed to the frame body 15 of the forming tool 6. The inner end surface of the holding surface 10 is in contact with or close to the outer peripheral surface of the tube 3 in the spiral groove formed by the forming roll 7.
The holding surface 10a is formed on the outer peripheral surface of the tube 3 in the spiral groove portion, that is, a curved surface having substantially the same curvature as the circumferential curvature of the top surface of the mountain portion located on both sides of the spiral groove. . Further, the holding surface 10a of the outer peripheral shape holding member 10
As shown in FIG. 1, is the spiral groove 1 in the axial direction.
It is formed to be longer than the pitch. Then, the forming roll 7 is located at a substantially intermediate portion of the holding surface 10a in the tube axis direction. The holding surface 10a of the outer circumferential shape holding member 10 holds the outer circumferential shape of the spiral grooved portion of the pipe in which the spiral groove is formed, that is, prevents the outer circumferential surface of the spiral grooved portion from being deformed. Further, particularly when the number of forming rolls 7 is 2, the outer peripheral shape maintaining member 1
With 0, the pipe material 3 is positioned at a fixed position between the forming rolls 7, 7.

Two outer peripheral shape holding members 10 are provided in the illustrated example, but when three or more forming rolls 7 are arranged as described above, the outer peripheral shape holding member 10 is located between the forming rolls 7. Thus, it is preferable to arrange three or more at equal intervals.

The inlet guide 11 and the outlet guide 12 are formed in a cylindrical shape, and the insertion hole 1 is formed through the center thereof.
The tube material 3 is fixed to the frame body 15 at both sides of the forming roll 7 and the outer peripheral shape holding member 10, that is, both sides in the axial direction of the tube material 3 so that the tube material 3 penetrates through 1a and 12a. The inner diameters of the insertion holes 11a and 12a of the inlet guide 11 and the outlet guide 12 are close to or in contact with the outer peripheral surface of the pipe 3 in the spiral groove portion whose inner surface is formed, that is, the top surfaces of the mountain portions located on both sides of the spiral groove. Therefore, the diameter of the pipe material 3 is set to be substantially the same, and the inlet guide 11 and the outlet guide 12 allow the spiral grooved portion of the molded pipe to bend or twist the pipe shaft due to the forming force of the spiral groove. I try not to cause such problems.

In FIG. 1, a tube pedestal 22 is fixedly provided on the base 1 at a side opposite to the tube material rotation driving means 2, and the other end side of the tube material 3 is placed on the rotary roll 23. It is designed to prevent bending and deflection of the pipe during molding.

Next, a method of manufacturing the spiral grooved tube having the structure of the first embodiment will be described.

First, the rod 20 is moved downward by the drive unit 21 of the forming tool 6 to open the pantograph type roll position adjusting member 8 so that the facing distance between both forming rolls 7 is made wider than the outer diameter of the tube material 3. I'll do it.

Next, the tube material 3 in which the spiral groove is not formed
Is the insertion hole 1 of the inlet guide 11 in the forming tool 6.
1a, between the forming rolls 7, 7, the outer peripheral shape holding member 1
Between 0 and 10, it is inserted into the insertion hole 12a of the outlet guide 12, one end of the tube material 3 is held by the chuck 4 of the tube material rotation driving means 2, and the other end side is a rotating roll of the pedestal 22. Support with 23.

Further, in the state where the pipe material 3 is inserted into the forming tool 6 as described above, the forming tool 6 is rotated to the forming start position of the spiral groove (position A in FIG. 1) for the pipe material rotation driving means 2
Move to the side.

Next, the driving unit 21 moves the rod 20 upward to move the roll position adjusting member 8 in the closing direction to move both forming rolls 7 and 7 in the centripetal direction of the tube blank 3 to form the forming rolls 7. , 7, the tube wall of the tube material 3 is pressed to make it concave.

Next, the tube material 3 is rotated about its axis by the tube material rotation driving means 2. As a result, since the support shafts 14 of both forming rolls 7 and 7 are inclined with respect to the axis of the pipe material 3, the forming tools 6 form the spiral groove in the pipe material 3 and The spiral grooved tube is manufactured by moving (driven) in a direction away from the material rotation driving means 2 (direction of arrow B in FIG. 1). The inclination direction of the support shaft 14 of the forming rolls 7, 7 and the rotating direction of the tube material 3 are moved in the direction in which the forming tool 6 moves away from the tube material rotation driving means 2 by the rotation of the tube material 3, as described above. Is set to.

When the molding tool 6 is moved and the molding tool 6 is difficult to follow when the molding tool 6 is moved, and the moldability and the shape accuracy are deteriorated, a drive source for moving the molding tool 6 in the tube axis direction is provided. A driving force for assisting the following in the moving direction may be applied to the forming tool 6.

When forming the spiral groove as described above,
Since the outer peripheral shape holding members 10, 10 are arranged between the forming rolls 7, 7, when the outer peripheral surface of the pipe of the formed spiral groove portion is about to be deformed, the outer peripheral shape holding member 10,
The holding surface 10a of 10 prevents the deformation of the spiral grooved tube, and prevents the spiral grooved tube from being deformed, such as being angular or flat. Further, particularly in the case where the number of forming rolls 7 is two as in the embodiment, since the pipe member 3 is positioned at a fixed position between the forming rolls 7 and 7 by the outer peripheral shape holding member 10, the above-mentioned angling is further performed. And deformation such as flatness is prevented.

Further, since the outlet guide 12 is provided on the outlet side of the spiral groove forming portion composed of the forming rolls 7, 7 and the outer peripheral shape holding members 10, 10, the outer periphery of the pipe in the portion where the spiral groove is formed. The surface is supported by the outlet guide 12, and it is possible to prevent the tube axis from being bent or twisted due to the forming force of the forming rolls 7 and 7 acting on the tube material 3.

Further, by providing the inlet guide 11 as described above, it is possible to further prevent the tube axis from being bent or twisted.

Further, as described above, the tube material 3 side is rotated,
This rotation causes the molding tool 6 side to move (or be driven as an assist) in the pipe axis direction, so that the pipe material 3 has a short overall length, a small diameter, or a lightweight pipe. The driving force of the material 3 can be reduced, and the driving device can be made compact.

When the spiral groove is formed, the forming tool 6 moves in a direction away from the tube material rotation driving means 2 which is the fixed side of the tube material 3, and the side of the tube material 3 opposite to the fixed side is free. Therefore, when the tube wall of the tube material 3 is bent in a concave shape by the forming roll 7, the free side of the tube material 3 is freely moved in the tube axis direction according to the bending amount, so that the thinning of the spiral groove portion occurs. do not do.

Although not shown, a mandrel may be inserted and arranged inside the tube material 3 to improve the molding accuracy. Further, control of the start and end positions of forming the spiral groove may be performed by an encoder or the like.

4 to 7 show a second embodiment.

In the second embodiment, the tube material 3 side is fixed so as not to rotate, and the forming tool 6 side is rotated around the tube axis to form a spiral groove in the tube material 3.

In FIG. 4, a rotation driving means 31 for forming tools is fixedly mounted on the base 1, and the forming tool 6 is connected to a rotating body 32 rotated by the rotation driving means 31 for forming tools. ing. The forming tool 6 has a plurality of forming rolls 7 similar to those of the first embodiment, a plurality of outer peripheral shape holding members 10, an inlet guide 11, and an outlet guide 12 in the central portion thereof, which are different from those of the first embodiment. It is similarly arranged and equipped. The tube material 3 is inserted through the central portions of these members as in the first embodiment.
Further, the tube material 3 thus inserted is movably penetrated through the rotary body 32 and the molding tool rotation driving means 31.

The molding tool 6 is adapted to rotate around the tube axis of the tube material 3 integrally with the rotating body 32 rotated by the rotation driving means 31 for the molding tool.

A guide 5 for moving is provided on the base 1 in a direction parallel to the pipe material 3 to be arranged, and a pipe fixing member 33 is freely mounted on the guide 5 along the guide 5 direction. It is equipped so that it can be moved. The tube fixing member 33 has a chuck 34 for fixing and holding the tube material 3.
The chuck 34 is configured such that the tube material 3 can be non-rotatably pinched or separated by the lifting and lowering of the upper chuck 34a by the cylinder 35.

A pedestal 36 is provided on the base 1 on the opposite side of the molding tool rotation driving means 31 with the tube fixing member 33 interposed therebetween.
Is fixedly arranged, and the receiving base 36 is provided with a rotating roll 37, and the tube material 3 is movably supported on the rotating roll 37.

A method of manufacturing the spiral grooved tube according to the second embodiment will be described.

First, the pipe fixing member 33 is moved to the spiral groove forming start position A shown in FIG. 4, and the pipe material 3 is rotated by the forming tool rotation driving means 31, the rotating body 32, the forming tool 6, and the pipe fixing member 33. Of the pipe fixing member 33.
Then, the tube material 3 is non-rotatably fixed by the chuck 34.

Next, the forming roll 7 in the forming tool 6 is moved in the centripetal direction of the pipe material 3 as in the first embodiment, and the pipe wall of the pipe material 3 is pressed by the forming roll 7 to make it concave.

Next, the molding tool 6 is rotated around the tube axis together with the rotating body 32 by the molding tool rotation driving means 31. As a result, a spiral groove is formed on the outer circumference of the tube material 3 by the same action as in the first embodiment. Further, by this molding, the pipe material 3 is pushed and moved in the direction of arrow B in FIG. 4, and the pipe fixing member 33 that holds the pipe material 3 follows the direction of arrow B in FIG.

In this way, the rotation of the tube material 3 side is blocked,
Even if the forming tool 6 side is rotated, the spiral groove can be formed in the pipe material 3 by the same forming action as that of the first embodiment, and the same effect as the forming of the first embodiment can be exhibited. .

FIG. 8 shows a third embodiment.

In the third embodiment, the molding tool rotation driving means 31 having the rotating body 32 and the molding tool 6 in the second embodiment is movably provided in the guide 5 provided on the base 1. The pipe fixing member 33 of the second embodiment is used as the base 1
It is fixed on the top. Since the other structure is the same as that of the second embodiment, the same members as those described above are designated by the same reference numerals and the description thereof will be omitted.

In the third embodiment, the pipe material 3 is inserted into the pipe fixing member 33, the forming tool 6, the rotating body 32, and the forming tool rotation driving means 31 as in the second embodiment, and the pipe material 3 is inserted. After non-rotatably fixed to the chuck 34 of the tube fixing member 33, the forming tool 6 is rotated around the tube axis by the forming tool rotation driving means 31, the forming tool 6 spirals the tube material 3 in the same manner as in the above embodiment. The groove is formed.

In the third embodiment, since the pipe material 3 side is fixed and the forming tool 6 side is movable in the pipe axial direction, the forming tool 6, the rotating body 32, and the forming tool rotation driving means 31 at the time of forming the spiral groove. Moves (follows) in the direction of arrow C along the guide 5 on the base 1, that is, along the tube axis direction.

Also in the third embodiment, the spiral groove is formed by the same action as that of the first embodiment, and the same effect as that of the first embodiment is exhibited.

In the third embodiment, since the heavy molding tool rotation driving means 31 and the molding tool 6 side having the rotating body 32 move, the molding tool 6 side, that is, the molding tool rotation driving means 31 is shown in FIG. It is advisable to provide a drive source for moving 8 in the direction of arrow C to give a driving force for assisting the rotation driving means 31 for the forming tool in the direction of arrow C.

In the second and third embodiments, it is possible to form a spiral groove in the long pipe material 3 while intermittently feeding the long pipe material 3. Therefore, as shown in FIG. 8, the tube material 3 wound in a coil shape is intermittently fed, a spiral groove is formed at a predetermined position, and the pipe material 3 is sequentially cut into a predetermined length. The yield can be improved.

When the tube material 3 wound into a coil as described above is used, the straight drawing machine 38 is fed during the feeding.
To provide. Alternatively, the plate material may be roll-formed and fed. Such a straight drawing machine and a roll pipe forming machine can be arranged as an integrated line on the spiral groove manufacturing machine.

[0072]

As described above, according to the first aspect of the present invention, it is possible to prevent the spiral groove tube from being deformed such as being square or flat.

According to the second aspect of the invention, it is possible to further prevent the pipe axis of the spiral grooved pipe from being bent or twisted.

According to the third aspect of the invention, the rotational driving force can be reduced and the driving device can be made compact.

According to the fourth aspect of the present invention, it is possible to prevent the occurrence of wall thinning in the groove portion at the time of forming the spiral groove.

According to the fifth aspect of the present invention, the drive device can be made compact when the pipe material is long or heavy.

Also in the invention of claim 6, the same effects as those of the inventions of claims 1 and 2 can be exhibited.

According to the invention of claim 7, it is possible to provide a manufacturing apparatus which exhibits the same effects as the effects of the invention of claim 1.

According to the invention described in claim 8, it is possible to provide a manufacturing apparatus exhibiting the same effect as that of the invention of claim 2.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an apparatus for manufacturing a spiral grooved tube showing a first embodiment of the present invention.

FIG. 2 is a view of the forming tool 6 of FIG. 1 viewed from the right side of the drawing.

FIG. 3 is an enlarged front view showing a forming roll and an outer peripheral shape maintaining member in FIG.

FIG. 4 is a side view showing an apparatus for manufacturing a spiral grooved tube showing a second embodiment of the present invention.

5 is a view showing a forming roll portion of the forming tool in FIG.

6 is a cross-sectional view taken along the line DD in FIG.

FIG. 7 is a front view showing the pipe fixing member in FIG.

FIG. 8 is a side view showing an apparatus for manufacturing a spiral grooved tube showing a third embodiment of the present invention.

FIG. 9 is a view for explaining the forming of a spiral grooved tube with a conventional forming roll.

FIG. 10 is a view showing a deformed state of a pipe that occurs during molding by the molding roll of FIG.

FIG. 11 is a view showing another modified example of the tube caused by the molding by the molding roll of FIG. 9.

FIG. 12 is a view showing another conventional forming roll.

[Explanation of symbols]

2 Tube material rotation drive means 3 tube material 6 forming tools 7 Forming roll 10 Peripheral shape retention member 12 Exit guide 31 Rotational drive means for forming tools 32 rotating body 33 Pipe fixing member

Claims (8)

[Claims] 1. A plurality of forming rolls forming a spiral groove in a pipe material are arranged on the outer periphery of the pipe material with a gap therebetween in the circumferential direction of the pipe material, and the plurality of forming rolls are formed into the pipe material. In the method for manufacturing a spiral grooved tube by pressing in the centripetal direction and rotating the outer circumference of the tube material relatively and moving relatively in the tube axis direction, the spiral groove is formed in the gap between the forming rolls. A method for manufacturing a spiral grooved tube, characterized in that the outer peripheral shape of the spiral grooved portion in the formed tube is retained. 2. The method for producing a spiral grooved pipe according to claim 1, wherein bending and twisting of the tube shaft of the spiral grooved portion are prevented on the side where the spiral grooved portion is formed and emerges in the forming roll. Method. 3. A pipe material is rotated by a pipe material rotation drive means, and the pipe material has an outer peripheral shape holding member which holds the outer peripheral shapes of the forming roll and the spiral grooved portion as the pipe material is rotated. The method for producing a spiral grooved tube according to claim 1 or 2, wherein the forming tool is moved in the tube axis direction. 4. The method for producing a spiral grooved tube according to claim 3, wherein the forming tool is moved in a direction away from the rotary drive means for tube material. 5. A molding tool rotation driving means rotates a molding tool having an outer peripheral shape retaining member for retaining the outer peripheral shapes of the molding roll and the spiral grooved portion, and the tube material is made into a pipe by the rotation. The method for manufacturing a spiral grooved tube according to claim 1 or 2, wherein the spiral grooved tube is moved in the axial direction. 6. A forming tool having an outer peripheral shape holding member for preventing rotation of a pipe material and holding the outer peripheral shapes of the forming roll and the spiral grooved portion is rotated by a forming tool rotation driving means, and this rotation is performed. Accordingly, the method for manufacturing a spiral grooved pipe according to claim 1 or 2, wherein the forming tool is moved in the pipe axis direction together with the forming tool rotation driving means. 7. A plurality of forming rolls forming a spiral groove in a pipe material are arranged on the outer periphery of the pipe material with a gap therebetween in the circumferential direction of the pipe material, and the plurality of forming rolls are formed into the pipe material. In the device for manufacturing the spiral grooved pipe by being pressed in the centripetal direction and relatively rotating the outer periphery of the pipe material and relatively moving in the pipe axial direction, the outer peripheral shape of the formed spiral grooved portion is changed. A peripheral shape holding member to hold,
An apparatus for manufacturing a spiral grooved tube, which is arranged in a gap between molding rolls. 8. The spiral grooved pipe according to claim 7, wherein a guide for preventing bending or twisting of the pipe shaft of the spiral grooved portion is provided on the side of the forming roll where the spiral grooved portion is formed and emerges. Manufacturing equipment.