JPH07195226A - Cutting/grooving machine of tubular body - Google Patents

Abstract

PURPOSE:To provide a cutting/grooving machine of a tubular body by which the cutting and grooving of the tubular body is simultaneously carried out by the same machine, and also a groove can be cut at a given distance from the end of the tubular body. CONSTITUTION:On the basis of the difference in the numbers of revolution of a gear 12 and a differential gear 13, a slide plate 16 is gradually rotatingly displaced on the eccentric cylindrical surface of a spindle 5, and also the radial position of a cutting tool unit 21 that has been integrally connected to the slide plate 16 is changed. Thus, first, a cutting tool 52 is turned at high speed, and then a tubular body 3 is cut. After or before the cutting process, a groove is formed in the cut tubular body 3, and the cutting and grooving of the tubular body 3 is simultaneously carried out, therefore, the working time is shortened, and also a groove of a uniform depth can be accurately formed at a given distance from the end of the tubular body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube cutting / grooving machine capable of cutting and grooving a tube provided with a cutting tool which rotates substantially concentrically with respect to a fixed tube.

[0002]

2. Description of the Related Art A conventional groove cutting tool guiding mechanism disclosed in Japanese Patent Publication No. 49-37475 has a structure as shown in FIG. In this case, the pipe body 102 to be cut
On one side of the main body 101 having a hole for inserting
An annular rotary gear 104 is rotatably attached, and a side wall of the rotary gear 104 has a blade feed gear 10 attached thereto.
The tool rest frame 111 that supports 8 is fixed by screws 124. The tool frame 1 includes a tool feed gear 1
A three-dimensional cam 112 that rotates in conjunction with 08 is supported, and the spiral groove 122 of this three-dimensional cam 112 has a tip of a moving element 114 guided by the tool frame 111 so as to be movable in the axial direction. Sphere 113 is engaged. A groove cutting tool 117 for cutting the groove of the pipe body 102 is integrally connected to the lower end of the moving element 114.

A kicker 1 is attached to the outer peripheral portion of the main body 101.
23 is planted so as to be able to engage with the blade feed gear 108, whereby the blade feed gear 108 abuts the kicker 123 every time the rotating gear 104 makes one rotation, and the blade feed gear 108 is moved. It is designed to be rotated one tooth at a time.

The guide mechanism for the groove cutting tool operates as follows.

A tubular body 102 to be cut in the hole of the main body 101.
After inserting the
The main body 101 is fixed to the pipe body 102 so that the pipe body 102 and the pipe body 102 are concentrically positioned. Next, with the spherical body 113 at the tip of the moving member 114 engaged with the spiral groove 122 of the three-dimensional cam 112, the moving member 114 is moved so that the groove cutting tool 117 contacts the outer peripheral surface of the pipe body 102. Adjust the position with respect to.

When the power source is started to rotate the rotary gear 104, the tool frame 111 integrated with the rotary gear 104 also rotates. Each time the tool frame 111 makes one rotation, the tool feed gear 108 collides with the kicker 123 and is rotated by one tooth each time, whereby the three-dimensional cam 112 also slowly rotates. The spiral groove 122 of the three-dimensional cam 112 is
In the starting end region, the moving member 114 and the grooving bite 117, which are gradually shallower in depth and which engage with the spiral groove 122, are gradually extruded toward the center of the pipe body 102 in the initial stage of cutting. become. After that, the mover 114 and the groove cutting tool 117 are moved by the spiral groove 122 along the axial direction of the pipe body 102,
In this way, a groove having a predetermined depth and width is cut on the outer peripheral surface of the tubular body 102.

[0007]

In such a known guide mechanism, when the outer peripheral surface of the tube body 102 is not a perfect circle or when the main body 101 is not concentrically arranged with respect to the tube body 102. It is no longer possible to form a groove in the tube body 102 having a uniform depth along the circumferential direction. However, in practice, due to manufacturing tolerances of the tube body 102 and tightening force of the fixing bolt 103, the outer peripheral surface of the tube body 102 is often non-circular, and the tube body 1
It is technically extremely difficult to dispose the main body 101 strictly concentrically with respect to 02.

Further, the formed groove is used for connection with an adjacent pipe by fitting a pipe connecting tool such as a coupling, and the distance from the end of the pipe is accurate. There must be. However, conventionally, a groove is formed in the tubular body once cut, which not only complicates the work of fixing the tubular body to the groove cutting machine, but also takes time, and as a result, the distance between the tubular end portion and the groove is increased. Inhomogeneity was inevitable.

According to the present invention, the cutting and grooving of the tubular body are performed by the same machine all at once, and the outer circumferential surface of the tubular body is irrespective of the shape of the outer circumferential surface of the tubular body and the centering accuracy of the tubular body and the main body. It is an object of the present invention to provide a cutting / grooving machine for a pipe having a uniform depth along the groove and capable of cutting a groove at a constant distance from the end of the pipe.

[0010]

In order to achieve the above object, in the present invention, an annular spindle is concentrically rotated with respect to the pipe body in a main body for fixedly holding the pipe body to be cut. It is movably supported around the spindle.
A concentric cylindrical surface concentric with the axis of rotation of the spindle,
An eccentric cylindrical surface that is eccentric to the rotation axis of the spindle is formed, and a gear that is immovable with respect to the spindle and a differential gear that is rotatable with respect to the spindle are adjacent to each other on the concentric cylindrical surface. The slide plate integrated with the bite unit integrally having the cutting bite and the groove cutting bite is fitted on the eccentric cylindrical surface, and the slide plate and the differential gear are arranged along the diametrical direction. The inner peripheral surfaces of the slide plates, which are non-rotatably connected to each other through the extending key means and are in sliding contact with the eccentric cylindrical surface, have a minor axis in the diameter direction passing through the key means and a major axis in a direction substantially perpendicular to the minor axis. Has an ellipse or an ellipse, the minor axis of which is approximately equal to the diameter of the eccentric cylindrical surface, and the major axis is at least twice the eccentric distance greater than the diameter of the eccentric cylindrical surface. , When driving, Differential gear, is characterized in that it is rotated with a slight rotation number Sa to each other.

[0011]

With the rotation of the gear and the differential gear, the spindle and the slide plate are driven and rotated, respectively.
In this case, the slide plate is gradually rotationally displaced on the eccentric cylindrical surface of the spindle based on the difference in rotation speed between the gear and the differential gear. This rotational displacement also changes the radial position of the cutting tool unit integrally connected to the slide plate. Therefore, the cutting bite cuts the tubular body at first while rotating at high speed. After or before this cutting step, by rotating the slide plate, a groove is formed in the cut tubular body. Since the cutting and the grooving of the pipe body are performed at once in this way, the processing time is shortened, and a groove having a uniform depth is accurately formed at a constant distance from the end of the pipe body.

[0012]

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

FIG. 1 shows a vertical section of the cutting and grooving machine, and FIG. 4 shows the structure of the main part thereof. An annular spindle 5 having a passage hole 4 for passing a pipe body 3 to be cut is provided in a main body 2 having a pipe body fixture 1.
Is rotatably supported concentrically with respect to the fixed tube body 3. In this case, the tubular body fixture 1 is composed of an annular screw 6 and a tightening member 7 that is movable in the radial direction. Around the spindle 5, a concentric cylindrical surface S concentric with the rotation axis O of the spindle 5 and an eccentric cylindrical surface S ′ eccentric with respect to the rotation axis O of the spindle 5 by an eccentric distance e (the center axis thereof is (O ') is formed. This spindle 5 can be manufactured, for example, as shown in FIG. 3, by connecting a basic circular pipe 8 and an eccentric circular pipe 9 which are fitted to each other with a lock pin 10.

An annular gear 12 is integrally connected to a concentric cylindrical surface S of the spindle 5 via a lock pin 11.
And an annular differential gear 13 which is rotatable relative to the spindle 5 and the gear 12 are arranged adjacent to each other. The number of teeth of the differential gear 13 and the number of teeth of the gear 12 are not the same, and in the case of this embodiment, for example, the number of teeth of the differential gear 13 is one more than the number of teeth of the gear 12.

On the eccentric cylindrical surface S'of the spindle 5, a slide plate 16 integral with the front plate 15 holding the bite unit 21 is fitted. Slide plate 16 and differential gear 1
The reference numerals 3 are non-rotatably connected to each other via a key means consisting of two keys 17 and a key groove 18 extending in the diametrical direction. As shown in FIG. 2, the inner peripheral surface T of the slide plate 16 which is in sliding contact with the eccentric cylindrical surface S ′ of the spindle 5 passes through the two key grooves 18, and has an elliptical or oval shape with a minor axis in the diameter direction. Is done. The minor axis of this elliptical shape is approximately equal to the diameter of the eccentric cylindrical surface S ', and the major axis of the elliptical shape is at least twice the eccentric distance e of the eccentric cylindrical surface S'than the diameter of the eccentric cylindrical surface S'. It's getting longer. In addition, in order to prevent the slide plate 16 from falling off, a retaining flange 19 is provided at the end of the spindle 5 so as to project.

Bite unit 2 fixed to the front plate 15
1 is shown in detail in FIGS. 5 and 6, and this unit basically comprises two frame members 2 fixed to a front plate 15.
0 and the pedestal 22, a fixed portion 34, and the fixed portion 34
It comprises a movable part 35 movably supported in the radial direction.

As shown in FIG. 6, the movable portion 35 is composed of an upper plate 36 and both side plates 37, 37, and is substantially U-shaped. The upper plate 36 is bolt-shaped having the operation head 14. The male threaded portion 38 of No. 2 extends downward and penetrates. A holding member 39, which will be described later, is screwed onto the male screw portion 38 by a female screw portion 40 and is suspended. This movable part 3
5, first pins 41, 41 are projectingly provided from both side plates 37, 37. The first pin 41 is pivotally supported by a pivot recess at one end of levers 43, 43 pivotally attached to the frame 20 by the second pins 42, 42.

Further, at the other ends of the levers 43, 43,
A horizontal support piece 53, which is rotatable with respect to the levers 43 and 43, is pivotally supported by the third pins 44 and 44 so as to connect both levers 43, and the horizontal support piece 53 supports the second pin 42 as a fulcrum. It can move up and down freely. Further, the horizontal bridging piece 53 is biased upward by a disc spring 46 as spring means mounted on the pedestal 22 of the fixing portion 34.

In the space sandwiched by the side plates 37 of the movable portion 35, the holding member 39 suspended by the male screw portion 38 is housed in a state in which its rotation is restricted as described above. The groove cutting tool 5 is provided with fixing screws 47 and 48 from the lateral direction and feed screws 49 and 50 from the upper direction, respectively.
1 and the cutting tool 52 are fixed, and a copying roller 45 is pivotally mounted near the inside thereof.

The gear 12 and the differential gear 13 are in mesh with first and second pinions 23 and 24, respectively, and the first pinion 23 is integrated with a drive shaft 26 supported by a drive casing 25. It is fixed, and the second pinion 24 is supported on the drive shaft 26 so as to be relatively rotatable. The second pinion 24 can be arbitrarily coupled to the drive shaft 26 via a starting clutch 27 that is axially movable at the end of the drive shaft 26 but is relatively non-rotatable. In addition, the drive shaft 26 supports a worm gear 29 that meshes with the worm 28 in the drive casing 25 so as to be relatively rotatable, and includes a clutch 30 that is substantially similar to the starting clutch 27.

After fixing the tubular body 3 with the tightening member 7,
Adjustments and actions when cutting and grooving the tube body 3 will be described with reference to FIGS. 7A and 7B. The depth of the groove depends on the tip position of the copying roller 45 and the groove cutting tool 5.
The wall thickness of the tubular body 3 to be cut is set by the distance D1 between the tip of the copying roller 45 and the tip of the cutting tool 52. By loosening the fixing screws 47, 48 of the holding member 39 and screwing in the feed screws 49, 50, the groove cutting tool 51 and the cutting tool 52 without applying any load to other members.
Can be sent to the position of (b). Then, after the respective distances D2 and D3 are determined, the fixing screws 47 and 48 are tightened to complete this work.

FIG. 8 (a) shows a step of initial setting of the cutting tool 21. In order to prevent idling of the cutting tool 52, the tip of the cutting tool 52 is preliminarily piped before the electric motor is operated. This is the work of contacting the body 3. In this case, by rotating the operation head 14, the male screw portion 38 sends the holding member 39 downward with respect to the movable portion 35. Even in this state, the holding member 39 can be fed out without applying any load to the disc spring 46 and other members, and the position where the cutting tool 52 comes into contact with the pipe body 3 and does not move further can be easily determined.

Next, when the worm 28 is rotated at a high speed by the electric motor and then the clutch 30 is engaged, the first pinion 23 is rotated via the worm gear 29 and the drive shaft 26, whereby the first pinion 23 is rotated. The gear 12 meshing with the gear 12 and the spindle 5 integrated with the gear 12 rotate at high speed. In this case, since the second pinion 24 meshing with the differential gear 13 can freely idle without any restriction, the differential gear 13, the slide plate 16 and the front plate 15 are The spindle 5 and the gear 12 are driven to rotate at the same speed. Therefore, since relative rotation does not occur between the spindle 5 and the slide plate 16, the cutting bit 52 and the groove cutting bit 51 are merely rotated around the rotation axis O of the spindle 5 and are displaced in the radial direction. There is nothing to do.

Next, the starting clutch 27 is moved to the right side in FIG. 1 to connect the second pinion 24 and the drive shaft 26 through the engagement of the clutch plates 32 and 33, and then the first pinion 23 and the second pinion. 24 rotate at the same speed as each other. However, since the number of teeth of the differential gear 13 meshing with the second pinion 24 is slightly larger than the number of teeth of the gear 12 (one in this case), this differential gear 13 is slightly smaller than the gear 12. It will rotate at a slower speed. In this way, the slide plate 16 connected to the differential gear 13 through the key means rotates around the eccentric cylindrical surface S ′ of the spindle 5 at a very low speed.

In the initial position shown in FIG. 8B, the minor axis of the elliptical inner peripheral surface T of the slide plate 16 is the spindle 5
Of the eccentric cylindrical surface S'with respect to the concentric cylindrical surface S of the eccentric cylindrical surface S (that is, the direction of the straight line connecting the rotation axis O and the central axis O '). Similarly, 52 and the groove cutting tool 51 are aligned along the eccentric direction, and the cutting of the pipe body 3 by the cutting tool 52 is started.

As shown in FIG. 9B, the slide plate 16
Is further rotated by 180 ° with respect to the spindle 5,
The minor axis of the elliptical inner peripheral surface T of the slide plate 16 is again aligned with the eccentric direction. At this rotational position, the cutting tool 52 and the groove cutting tool 51 are closer to the pipe body by the eccentric distance 2e than in the initial state. In this case, the tip of the cutting bite 52 has already penetrated the wall of the tube 3 and is therefore
The tube body 3 is cut.

At this point, the cutting and grooving of the tubular body 3 are completed, but the main body 2 does not immediately stop,
After that, the rotary motion and the eccentric motion are continued. However, since the copying roller 45 abuts on the outer peripheral surface of the pipe body 3 and rolls as shown in FIG. 9A, the groove cutting tool 51 no longer cuts the pipe body 3 more than necessary. This is because the holding member 39 integrated with the groove cutting tool 51 receives a reaction force outward in the radial direction from the outer peripheral surface of the tubular body 3 via the copying roller 45, and based on this reaction force, the holding member 39 and the male screw portion. 38, the movable portion 35 is pushed upward, the lever 43 tilts around the second pin 42 as a fulcrum, and the disc spring 46 is compressed, while moving outward relative to the front plate 15 and the fixed portion 34 in the radial direction. Because it moves.

Here, in the present embodiment, the byte unit 2
It is expressed that cutting and grooving are performed when 1 is inverted by approximately 180 °, but when the tube body 3 is thin, 60
Cutting and grooving will be completed at both 90 ° and 90 °. This is achieved by adjusting the tip positions of the groove cutting tool 51 and the cutting tool 52 in accordance with the diameter and the tube thickness of the tube body 3 as described above.

Although the embodiments have been described above with reference to the drawings, the specific configuration is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. .

[0030]

EFFECTS OF THE INVENTION Since the cutting and grooving of the pipe body are performed at once, the processing time is shortened, and a groove having a uniform depth is accurately formed at a constant distance from the end of the pipe body. . Further, after the processing is finished, the processing does not proceed further than the processing of the predetermined groove without stopping the driving of the main body, which is convenient in use.

[0031]

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of a pipe cutting / grooving machine according to the present invention.

FIG. 2 is a front view of a slide plate and a unit used in the present invention.

FIG. 3 is a front view of a spindle used in the present invention.

FIG. 4 is a perspective view of a main part of the present invention.

5 is an enlarged view of the bite unit in FIG. 1. FIG.

6 is a view taken along the line AA of FIG.

FIG. 7 is a schematic view showing an adjusting process of the bite unit.

FIG. 8 is a schematic view of an initial state of a cutting / grooving process.

FIG. 9 is a schematic view of the end state of the process following FIG.

FIG. 10 is a partial cross-sectional view of a conventional groove cutting tool.

[Explanation of symbols]

1 Pipe Fixture 2 Main Body 3 Tubular Body 4 Passage Hole 5 Spindle 6 Annular Screw 7 Tightening Member 8 Basic Circular Pipe (Concentric Cylindrical Surface) 9 Eccentric Circular Pipe (Eccentric Cylindrical Surface) 10 Lock Pin 11 Lock Pin 12 Gear 13 Differential Gear 14 operation head 15 front plate 16 slide plate 17 key 18 key groove 19 retaining flange 20 frame 21 bite unit 22 pedestal 23 first pinion 24 second pinion 25 drive casing 26 drive shaft 27 starting clutch 28 worm 29 worm gear 30 clutch 31 Handle Insert Hole 32 Clutch Plate 33 Clutch Plate 34 Fixed Part 35 Movable Part 36 Upper Plate 37 Both Sides Plate 38 Male Screw Part 39 Holding Member 40 Female Screw Part 41 First Pin 42 Second Pin 43 Lever 44 Third Pin 45 Copying Roller 46 Plate Spring (spring means) 47 fixed 48 fixing screw 49 feed screw 50 feed screw 51 Mizosetsu byte 52 cutting byte 53 lateral bridging piece

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Hashizume, 1-2 1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Osaka Gas Co., Ltd. (72) Inventor Masaya Kinugawa 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka 1-2 within Osaka Gas Co., Ltd. (72) Inventor Toru Morita 4-1-2 Hiranomachi, Chuo-ku, Osaka City, Osaka Prefecture Within Osaka Gas Co., Ltd.

Claims (5)

[Claims] 1. An annular spindle is rotatably supported by a main body for fixedly holding a pipe body to be cut so as to be concentrically rotatable with respect to the pipe body. A concentric cylindrical surface concentric with respect to the axis and an eccentric cylindrical surface eccentric with respect to the rotation axis of the spindle are formed, and the concentric cylindrical surface has a gear that is immovable with respect to the spindle and a rotation with respect to the spindle. The movable differential gears are fitted adjacent to each other, and the eccentric cylindrical surface is fitted with a slide plate integrated with a bite unit integrally having a cutting bite and a groove cutting bite. The plate and the differential gear are connected to each other so as not to be rotatable relative to each other through a key means extending in the diametrical direction, and an inner peripheral surface of the slide plate slidingly contacting the eccentric cylindrical surface has a diameter that passes through the key means. Direction short axis and approximately right angle to it Forming an ellipse or an ellipse having a major axis in the direction, the minor axis being approximately equal to the diameter of the eccentric cylindrical surface, and the major axis being at least twice the eccentric distance than the diameter of the eccentric cylindrical surface. A machine for cutting and grooving a pipe, which has a long length, and in driving, the gear and the differential gear are rotated with a slight difference in rotational speed from each other. 2. The pipe cutting / grooving machine according to claim 1, wherein the spindle is composed of a basic circular pipe and an eccentric circular pipe fitted to the basic circular pipe. 3. The pipe cutting / grooving machine according to claim 1, wherein the bite unit is arranged in a plane including the rotation axis of the key means and the spindle. 4. The cutting / grooving of the pipe body according to claim 3, wherein a cutting bite and a groove cutting bite are attached to the bite unit so that respective tips of the cutting bite and the grooved bite can be moved and adjusted in a rotation axis direction of the spindle. Cutting machine. 5. The bite unit includes a fixed portion that is immovable with respect to the slide plate and a movable portion that is arranged so as to be movable in the radial direction with respect to the fixed portion. A holding member provided with a cutting tool and a copying roller is movably held, and the movable portion is connected to one end of a lever pivotally attached to a fixed portion, and the other end of the lever is connected to the movable portion. 5. Spring means for urging the movable part inward in the radial direction is arranged.
The pipe cutting / grooving machine described in.