JPH09108927A - Pipe cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform cutting work on various pipe-shaped works different in the size. SOLUTION: Plural cutter holders 25 having disk cutters 23 are respectively arranged on one end side of a rotary body 13, and the plural cutter holders 25 are constituted so as to be rectilinearly movable in synchronism with each other in the direction for approaching and separating relative to the rotational center of the rotary body 13. In order to rectilinearly move the plural cutter holders 23 in synchronism with each other, driven racks 29 are respectively arranged on the respective cutter holders 23, and pinions 31 meshing with the driven racks 19 corresponding to the rotary body are respectively arranged, and a synchronously rotating device 33 is provided to rotate the plural pinions 31 in synchronism with each other.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pipe cutting machine for cutting a pipe-shaped work.

[0002]

2. Description of the Related Art As a prior art for pipe cutting machines
This is disclosed in Japanese Patent Publication No. 7-81020, and this prior art will be briefly described below.

A rotating body is rotatably provided in the processing head main body by driving a drive motor, and the rotating body is provided with a support hole. A plurality of cutter holders each equipped with a disc cutter are provided on one end side of the rotating body,
The plurality of cutter holders are oscillated in a direction approaching and separating from the center of rotation of the rotating body in synchronization with the operation of the fluid pressure cylinder or the like.

The processing head body is provided with a support pipe having a work insertion hole into which a work can be inserted, and a tip end of the support pipe is provided with a cread chuck device for fixing the work. Here, the support pipe and the collet chuck device are located in the support holes in the rotating body.

Therefore, the work is inserted into the work insertion hole and fixed by the collet chuck device. Then, by rotating the rotating body by driving the drive motor, the plurality of disk cutters revolve around the rotation center of the rotating body. Further, under the condition that the plurality of disk cutters are revolved, the plurality of cutter holders are swung synchronously in the direction approaching the rotation center by the operation of the fluid pressure cylinder or the like, so that the plurality of disk cutters can be predetermined. The cutting amount can be given to perform the cutting process on the work.

[0006]

However, in the conventional pipe cutting machine, the cutter holder swings toward and away from the center of rotation of the rotating body, so that the cutter of the disk cutter is moved as compared with the case of linear movement. It is not possible to increase the range of movement in the direction of approach and separation. Therefore, it becomes difficult to cut various pipe-shaped works having different sizes (including outer diameter, wall thickness, etc.).

Further, since the work is fixed by the collet chuck device, when the size of the work is largely changed, the collet chuck device needs to be replaced, and the cutting work of the pipe-shaped work becomes complicated. There is a problem of doing.

[0008]

In order to solve the above-mentioned conventional problems, as a first means of the present invention, in a pipe cutting machine for cutting a pipe-shaped work, a processing head main body is provided. A rotary body is rotatably provided by driving a drive motor, the rotary body is provided with an insertion hole into which the work can be inserted, and a plurality of cutter holders each provided with a disk cutter are provided on one end side of the rotary body.
A plurality of cutter holders are configured to be linearly movable in synchronization with each other in a direction approaching and separating from the center of rotation of the rotating body, and in order to synchronously linearly move the plurality of cutter holders, each of the cutter holders is provided with a respective driven rack. It is characterized in that each of the pinions engaged with a driven rack corresponding to the rotating body is provided with a synchronous rotation device that rotates a plurality of pinions in synchronization.

As a second means, in addition to the constituent features of the first means, the synchronous rotation device is provided with a drive rack movably provided in the rotating body in the longitudinal direction and screwed into a plurality of pinions. And a fluid pressure cylinder for moving the drive rack in the longitudinal direction.

As a third means, in addition to the constituent requirements of the first or second means, a vise device for sandwiching and fixing a work is provided at a position outside the rotating body and close to the disk cutter. It is characterized by

As a fourth means, in addition to the constitutional requirements of the third means, the vise device is provided with a pair of vices which are movable in a direction of approaching and separating in synchronization, and the center of the pair of vices and the rotation of the vise. It is characterized in that it is configured so that the center of rotation of the body substantially coincides with it.

As a fifth means, in addition to the constituent features of the fourth means, in order to move the pair of vices in a direction of approaching and separating in synchronization, a left screw part and a right screw part are provided and the approaching and separating parts are provided. A screw member extending in the direction is provided, and the left screw portion is screwed into one vise and the right screw portion is screwed into the other vise.

By the above means, the pipe-shaped work is inserted into the insertion hole of the rotating body, and the tip side of the work is positioned between the pair of vices. Next, the screw member is rotated to synchronously move the pair of vices in the approaching direction, and the work is clamped and fixed by the pair of vices. Then, by rotating the rotating body by driving the drive motor, the plurality of disk cutters revolve around the rotation center of the rotating body. Further, by moving the drive rack in the longitudinal direction by the operation of the fluid pressure cylinder under the condition that the plurality of disc cutters are revolved, the plurality of cutter holders are connected to each other by the action of the driven rack and the pinion. It moves linearly in synchronization with the direction of approaching the center of rotation. As a result, a predetermined cutting amount can be given to the plurality of disc cutters, and the pipe-shaped work can be cut.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a pipe cutting machine 1 according to an embodiment of the present invention is based on a body frame 3 for cutting a pipe-shaped work W. The cutting processing head 5 to be performed and the vise device 7 for fixing the work W are provided.

Explaining the cutting processing head 5, the processing frame main body 9 is provided in the main body frame 3, and the processing head main body 9 has a rotary body 13 bearing an insertion hole 11 into which the work W can be inserted. It is rotatably provided via 15. The rotating body 13 includes a hollow shaft portion 17 and a front portion of the shaft portion 17 (left in FIG. 1,
In FIG. 2, a cylindrical casing portion 19 is integrally provided at an end portion (front side facing the paper surface). Further, in order to rotate the rotating body 13, a pulley 21 is integrally provided at a rear end portion of the shaft portion 17, and the pulley 21 is linked to a drive motor (not shown).

A plurality of cutter holders 25 each having a disc cutter 23 are provided on the front side of the casing portion 19 of the rotating body 13, and the plurality of cutter holders 25 approach and separate via a guide member 27 (of the casing portion 19). It is configured to be movable in the radial direction). In order to move the plurality of cutter holders 25 in the radial direction of the casing portion 19 in synchronization with each other, each cutter holder 25 has a driven rack 2 attached thereto.
9 is provided, and a pinion 31 meshed with a corresponding driven rack 29 is provided at an appropriate position of the casing portion 19, and a synchronous rotation device 33 that synchronously rotates the plurality of pinions 31 is provided. .

Here, the synchronous rotation device 33 will be described in more detail. The shaft portion 1 of the rotating body 13 is described below.
A cylindrical first slider 35 is provided in the central portion of 7 so as to be movable in the front-rear direction (longitudinal direction of the shaft portion 17). This first slider 35 is attached to the rotating body 13 via a spline or a rotation stop key. It cannot rotate with respect to the outside.
A cylindrical second slider 39 having a plurality of drive racks 37 meshing with the corresponding pinions 31 is integrally provided on the first slider 35 via a connecting member 40, and each drive rack 37 has a casing portion. Located within 19.
Here, the second slider 39 cannot rotate with respect to the inner side of the rotating body 13 via the spline or the rotation stop key, and the connecting member 40 can move in the front-rear direction with respect to the elongated hole 41 of the shaft portion 17. It is supported. Above slider 3
An annular hydraulic cylinder 43 is provided in the processing head main body 9 for moving 5 in the front-rear direction, and an annular piston 45 in the hydraulic cylinder 43 is connected to the first slider 35 via appropriate means. The piston 45
Is immovable in the front-rear direction with respect to the first slider 35 and rotatable by the action of the radial bearing 47 and the thrust bearing 49.

The vice device 7 will be described with reference to FIGS. 1 and 3. The rotating body 1 in the main body frame 3 will be described.
3, a pair of vise guides 51 are provided at left and right sides (front and back facing the paper surface in FIG. 1, left and right in FIG. 3) at positions close to the disc cutter 23. The upper portion of 51 is integrally connected by a connecting member 53. The pair of vise guides 51 has a pair of vices 55, 5 for fixing the work W in the vertical direction.
7 is provided so as to be movable in the vertical direction, and vices 55, 5
The pressing surface of 7 is formed in a V shape. Here, the centers of the pair of vices 55 and 57 and the center of the rotating body 13 are substantially coincident with each other. In order to move the pair of vices 55, 57 synchronously in the up and down direction in which they approach and separate from each other, each vise guide 51 is provided with a right-hand threaded portion 59 and a left-handed threaded portion 61, and a screw member 63 extending in the up-down direction mounts the bearing 65. The right screw portion 59 of each screw member 63 is screwed to one vise 55, and the left screw portion 61 of each screw member 63 is screwed to the other vise 57. is there. In order to rotate the screw member 63, the upper end side of the screw member 63 is screwed into the connecting member 53, and the operating lever 67 is integrally connected to the upper end portion of the screw member 63. Instead of integrally connecting the operation lever 67 to the upper end of the screw member 63, a rotary motor may be interlocked and connected to the upper end of the screw member 63.

Next, the operation of the embodiment of the present invention will be described.

The pipe-shaped work W is inserted into the insertion hole 11 of the rotating body 13 and positioned between the pair of vices 55 and 57. Next, each screw member 63 is rotated by the action of the operation lever 67 to synchronously move the pair of vices 55 and 57 in the up and down direction in which they approach and separate, and the work W is pressed and fixed by the pair of vices 55 and 57. . And
By rotating the rotating body 13 differently by driving the drive motor, the plurality of disk cutters 23 can be revolved around the rotation center of the rotating body 13. Further, under the condition that the plurality of disk cutters 23 revolve, the first slider 35 is moved rearward with respect to the rotating body 13 by the operation of the hydraulic cylinder 43, so that the plurality of drive racks 37 are integrally moved rearward. By moving to the driven rack 29
Also, in combination with the action of the pinion 31, the plurality of cutter holders 25 can be linearly moved in synchronization with each other in the direction toward and away from each other (the radial direction of the casing portion 19). As a result, the plurality of cutter holders 25 can be linearly moved in synchronization with each other in the approaching and separating directions, and the plurality of disc cutters 23 can be cut to cut the work W.

According to the embodiment of the present invention as described above, when the cutter holder 25 moves linearly in the direction toward and away from the center of rotation of the rotating body 13 (the radial direction of the casing portion 19), the cutter holder 25 swings. Compared with the above, the moving range of the disc cutter 23 in the radial direction can be increased. Therefore, it becomes easy to cut various pipe-shaped works W having different sizes (including outer diameter, wall thickness, etc.).

Further, since the work W is fixed on the outer side of the rotating body 13 by the vise device 7, even if the size of the work W is significantly changed, the work W can be sufficiently processed.
Can be fixed.

[0023]

According to the invention described in any one of claims 1 to 4, the cutter holder is linearly moved in a direction of approaching and separating from the center of rotation of the rotating body. As compared with the case of swinging, the moving range of the disk cutter in the direction of approaching and separating can be increased. Therefore, size (including outer diameter, wall thickness, etc.)
It becomes easy to perform cutting processing on various pipe-shaped works of different shapes.

According to the invention described in any one of claims 3 to 5, in addition to the above effect, the work is fixed on the outer side of the rotating body by the vise device. The workpiece can be sufficiently fixed even when the size of is greatly changed.

[Brief description of the drawings]

FIG. 1 is a side view of a pipe cutting machine, partly in section.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a diagram showing an arrow III in FIG.

[Explanation of symbols]

 1 Pipe Cutting Machine 3 Main Frame 5 Cutting Processing Head 7 Vise Device 9 Processing Head Main Body 11 Insertion Hole 13 Rotating Body 23 Disk Cutter 25 Cutter Holder 29 Driven Rack 31 Pinion 37 Drive Rack 55, 57 Vise 59 Right Hand Thread 61 Left Hand Thread 63 Screw member W work

Claims (4)

[Claims] 1. A pipe cutting machine for cutting a pipe-shaped workpiece, wherein a rotating body is rotatably provided on a processing head body by driving a drive motor, and the workpiece can be inserted into the rotating body. A plurality of cutter holders each provided with a disk cutter on one end side of the rotating body, the plurality of cutter holders are configured to be linearly movable synchronously in a direction approaching and separating from the center of rotation of the rotating body, In order to synchronously move the plurality of cutter holders linearly, each cutter holder is provided with a driven rack, each of which is provided with a pinion meshed with the driven rack corresponding to the rotating body, and a plurality of pinions are synchronously rotated. A pipe cutting machine characterized by being provided with. 2. The synchronous rotation device includes a drive rack movably provided in the rotating body in the longitudinal direction and screwed into a plurality of pinions, and a fluid pressure cylinder for moving the drive rack in the longitudinal direction. The pipe cutting machine according to claim 1, wherein the pipe cutting machine is provided. 3. The pipe cutting according to claim 1, wherein a vice device for holding and fixing a work is provided at a position outside the rotating body and close to the disc cutter. Machine. 4. The vise device is provided with a pair of vices that can move in a direction of approaching and separating in synchronization with each other, and is configured such that a center of the pair of vices and a center of rotation of the rotating body are substantially coincident with each other. The pipe cutting machine according to claim 3, wherein: