JPH11197739A - Method and apparatus for producing grooved tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration and noise even in applying grooving work at a high speed and to conduct the grooving work precisely and at a high speed. SOLUTION: An input shaft 39 supported to a gear case 26 is rotated by a motor 37, a shaft member 40 nearly unmovably supported to the gear case 26 in the axial direction is rotated as linking to the rotation of the input shaft 39, a spindle 22 connected to the shaft member 40 through a joint member 41 is rotated, a groove forming head 21 provided to the spindle 22 is rotated and is appropriately moved in the axial direction by the external force acting to the spindle 22, grooving work is performed to a tubular body K and a grooved tube M is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a grooved tube for producing a grooved tube by subjecting a tubular body to groove processing.

[0002]

2. Description of the Related Art As a conventional method of manufacturing a grooved tube, a metal tape is formed into a tube, and ends thereof are butt-welded to form a tube (straight line). In some cases, a spiral groove or the like is formed on the outer surface of the tubular body through the inside of the head.

In such a method for manufacturing a grooved tube, a normal spiral groove cannot be formed unless the running speed of the tubular body, the rotational speed of the groove forming head, and the forming angle of the groove forming die of the groove forming head do not match. Molding defects such as poor groove shape, crushed grooves, and external damage to grooved tubes occur.

[0004] In order to prevent molding defects when the above three points do not coincide with each other, a relief is usually provided in the manufacturing apparatus.
For example, as shown in FIG. 2, the groove forming head 1 is made to be movable in the axial direction of the tubular body K.

That is, the manufacturing apparatus shown in FIG.
The gear case 6 is composed of a cylindrical roller bearing 3 and a ball bearing 4.
The gear case 6 on which the ball bearing 4 is supported has a gap 5 of several mm so that the ball bearing 4 can move. A groove forming head 1 is provided at one end of the main shaft 2, and a forming die 14 is provided inside the groove forming head 1. On the other hand, a motor 7 is attached to the gear case 6, and a rotating shaft of the motor 7 is connected to an input shaft 9 via a motor coupling 8. The input shaft 9 is connected to the gear case 6 via bearings 10 and 11.
It is supported by. A spur gear 12 is fixed to the input shaft 9. The main shaft 2 has a spur gear 1 meshing with a spur gear 12.
3 is fixed.

When the motor 7 is driven, the input shaft 9 is rotated, the main shaft 2 is rotated by the spur gears 12 and 13, the groove forming head 1 is rotated, and the forming die 14 is formed on the tubular body K running through the inside thereof. A grooved tube M having a spiral groove is manufactured. When forming, groove forming head 1
The main shaft 2 moves in the axial direction by the maximum gap 5 between the inner ring portion of the cylindrical roller bearing 3 and the outer diameter portion of the ball bearing 5 due to an external force acting on the main shaft 2. During the movement, the spur gear 13 moves relative to the spur gear 12 in the axial direction.

[0007]

However, in the conventional apparatus for manufacturing a grooved pipe, the main shaft 2 is mounted on the inner ring portion of the cylindrical roller bearing 3 and the outer diameter portion of the ball bearing 5 so as to be movable in the axial direction. Therefore, the play in the fitted state is large, and the backlash of the spur gear 13 is made large so as to be able to move relative to the spur gear 12 in the axial direction. In addition, large vibrations and noises are generated at the time of grooving, and it is difficult to perform grooving at high speed.

In particular, in recent years, there has been a demand for a grooved tube which has a small groove pitch, has higher flexibility, and is easy to handle, and requires a high-speed processing in view of improvement in productivity. Therefore, it is also desired to form more accurate grooves.

The present invention has been made in view of the above circumstances, and provides a grooved pipe capable of performing high-speed and high-precision grooving even with low vibration and noise even when high-speed grooving is performed. An object is to provide a manufacturing method and a manufacturing apparatus.

[0010]

According to a method of manufacturing a grooved tube of the present invention, an input shaft supported by a gear case is rotated by a motor, and the input shaft is axially moved to the gear case in conjunction with the rotation of the input shaft. Rotating a shaft member which is supported so as to be substantially immovable, rotating a main shaft connected to the shaft member via a joint member, rotating a groove forming head provided on the main shaft, and applying an external force acting on the main shaft The groove is formed on the tubular body by appropriately moving the tubular body in the axial direction.

A grooved tube manufacturing apparatus according to the present invention comprises a main shaft rotatably and axially movably supported by a gear case, and a tubular member provided at one end of the main shaft and passing through the inside. An apparatus for manufacturing a grooved tube including a groove forming head for performing groove processing and a drive mechanism for rotating and driving the main shaft, wherein the drive mechanism includes a motor and an input shaft connected to a rotation shaft of the motor. A shaft member that is supported by the gear case in a substantially immovable state in the axial direction and is driven to rotate by the input shaft; and the shaft member and the main shaft can be moved in the axial direction and substantially rotate in the rotational direction. A joint member that is connected in a state in which the joint member cannot be moved.

The shaft member is formed of a hollow hollow shaft, and the main shaft is provided through the hollow portion of the hollow shaft, and both end portions thereof are movable in the axial direction to the gear case. And may be connected to the hollow shaft via the joint member.

One end of the main shaft is supported by the gear case via a cylindrical roller bearing, and the other end is capable of axially sliding a bearing case containing an angular ball bearing into a groove provided in the gear case. And a helical gear fixed to the input shaft, and a helical gear meshing with the helical gear may be fixed to the shaft member.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a grooved tube according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

First, before describing the method of manufacturing the present grooved pipe, a manufacturing apparatus used in the present manufacturing method will be described.

As shown in FIG. 1, the present manufacturing apparatus is provided with a main shaft 22 rotatably and axially movably supported by a gear case 26, and provided at one end of the main shaft 22.
A groove forming head 21 for forming a groove in the tubular body K passed through the inside and a drive mechanism 30 for rotating the main shaft 22 are provided. A forming die 24 is provided in the groove forming head 21.

The drive mechanism 30 includes a motor 37, an input shaft 39 connected to a rotating shaft of the motor via a motor coupling 38, and supported by the gear case 26 by ball bearings 34 and 35, and the gear case 26. A shaft member 40 supported by a ball bearing 43 attached to a bearing holding portion 42 integrally formed inside the shaft member 26 so as to be substantially immovable in the axial direction, and the shaft member 40 and the main shaft 22 are connected to each other by an axis. And a coupling member 41 which is connected in a state in which the shaft member 40 is movable in
Is fixed to the input shaft 39, and the helical gear 36 meshing with the helical gear 44 is fixed to the input shaft 39.

The shaft member 40 is constituted by a hollow hollow shaft, and the main shaft 22 is provided through the hollow portion of the hollow shaft.
The cylindrical roller bearing 23 and the angular ball bearings 27 and 28 are supported so as to be movable in the axial direction. Here, the angular ball bearings 27 and 28 are cylindrical bearing case 2
5, the bearing case 25 is inserted into a groove 29 provided in the gear case 26 so that the bearing case 25 is integrated with the main shaft and slides on the outer surface to move in the axial direction so as to move in the axial direction. It is stored with a gap of several millimeters between.

In the joint member 41, a flange portion 47 formed at an intermediate portion of the main shaft 22 and a flange member 48 provided at an end portion of the shaft member 40 can move in the axial direction and play in the rotation direction. It is configured by being connected by a connecting member 49 so as not to exist.

Next, a manufacturing method for manufacturing a grooved pipe using the apparatus for manufacturing a grooved pipe according to the embodiment will be described.

The metal tape is formed into a tubular shape, and the ends thereof are butt-welded to form a tubular body (striated body) K, which is fed forward through a groove forming head 21 by a feeding device (not shown). At this time, the input shaft 39 is rotated by the motor 37, the shaft member 40 is rotated via the helical gear 36 and the helical gear 44, and the main shaft 22 connected to the shaft member 40 via the joint member 41 is rotated to form the groove. By rotating the head 21, a spiral groove is formed in the tubular body K by the internal forming die 24. The rotation speed of the groove forming head 21 is synchronized with the feeding speed of the feeding device according to the groove pitch of the grooved tube M to be manufactured.

At this time, the reaction force at the time of forming the groove forming head 21
The main shaft 22 moves relative to the shaft member 40 at the joint member 41, and the cylindrical roller bearing 2
3 moves in the axial direction at the inner ring, the roller portion, and the outer peripheral portion of the bearing case 25. As a result, the occurrence of groove processing defects is automatically avoided.

In this embodiment, the helical gears 36, 44 having a low backlash and a high meshing efficiency are used, so that even if the main shaft 22 is rotated at a high speed, no large vibration or noise is generated.

Further, since the joint member 41 has high rigidity and little play in the rotating direction, vibration and noise during high-speed rotation can be similarly eliminated.

Further, the bearing case 25 containing the cylindrical roller bearing 23 and the angular ball bearings 27, 28
Since the main shaft 22 is supported with high rigidity so as to be movable in the axial direction, generation of vibration and noise during high-speed rotation can be similarly eliminated.

Incidentally, in the manufacturing apparatus shown in FIG. 1, the rotational speed, which was limited to 3000 rpm in the past, was increased to 5000 to 60 rpm.
It was possible to increase the rotation speed to 00 rpm.

It should be noted that instead of the joint member of the above-described embodiment, the shaft member 40 and the main shaft 22 may be connected by a so-called spline connection.

In order to support the main shaft 22 on the gear case 26, a so-called fluid bearing may be used. This makes it possible to more smoothly move the spindle in the axial direction and to rotate the spindle at a high speed.

[0029]

As described above, in the method and apparatus for manufacturing a grooved pipe according to the present invention, even if the groove processing is performed at high speed, the vibration and noise are reduced, and the groove processing is performed at high speed and high accuracy. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a view showing an apparatus for manufacturing a grooved tube according to an embodiment of the present invention.

FIG. 2 is a diagram showing an apparatus for manufacturing a grooved tube to be compared with the present invention.

[Explanation of symbols]

 Reference Signs List 21 groove forming head 22 main shaft 23 cylindrical roller bearing 25 bearing case 26 gear case 36 helical gear 37 motor 39 input shaft 40 shaft member 41 joint member 44 boss gear

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takashi Sasaki 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Inside the Hidaka Plant, Hitachi Cable Co., Ltd. (72) Ayumu Nishidate 5 Hidaka-cho, Hitachi City, Ibaraki Prefecture No. 1-1, Hidaka Factory, Hitachi Cable, Ltd.

Claims (4)

[Claims] An input shaft supported by a gear case is rotated by a motor, and a shaft member supported by the gear case so as to be substantially immovable in the axial direction in conjunction with the rotation of the input shaft. The main shaft connected to the shaft member via a joint member is rotated, the groove forming head provided on the main shaft is rotated, and the main shaft is appropriately moved in the axial direction by an external force acting on the main shaft to perform groove processing on the tubular body. A method for producing a grooved tube, characterized in that it is performed. 2. A main shaft rotatably and axially movably supported by a gear case, and a groove forming head provided on one end of the main shaft for forming a groove in a tubular body passing through the main body. An apparatus for manufacturing a grooved tube, comprising: a drive mechanism that rotationally drives the main shaft, wherein the drive mechanism includes a motor, an input shaft connected to a rotation shaft of the motor, and the gear case. A shaft member which is supported in a substantially immovable state and is rotationally driven by the input shaft; and a joint which connects the shaft member and the main shaft so as to be movable in the axial direction and substantially immovable in the rotational direction. An apparatus for manufacturing a grooved pipe, comprising: 3. The shaft member is constituted by a hollow hollow shaft, and the main shaft is provided through a hollow portion of the hollow shaft, and both end portions thereof are movable in the axial direction to the gear case. 3. The grooved pipe manufacturing apparatus according to claim 2, wherein the grooved pipe is supported by the hollow shaft and connected to the hollow shaft via the joint member. 4. One end of the main shaft is supported by the gear case via a cylindrical roller bearing, and the other end is axially slidable in a bearing case containing an angular ball bearing in a groove provided in the gear case. 4. The apparatus for manufacturing a grooved pipe according to claim 3, wherein the helical gear is supported by being inserted into the shaft, a helical gear is fixed to the input shaft, and a helical gear meshing with the helical gear is fixed to the shaft member.