JPH1034428A - Rotary cutting method and device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the life of a rotary cutter by absorbing the escape of the work caused by the rotary cutter generated when cutting the work. SOLUTION: There is provided a clamp device 17 for gripping a pipe-shaped work W, and a material feeding device 9 for transferring and positioning the work gripped by the clamp device to a rotary cutter 13 of a cutting machine. The clamping device 17 is provided for the material feeding device 9 so as to be movable in a direction opposite to the workpiece material feeding direction. A lock device 19 for locking and releasing the clamp device to and from the material feeding device is provided. The clamping device is locked to the material feeding device by the locking device, and the material feeding device is moved to position the workpiece at the rotary cutter 13 of the cutting machine. After starting to cut the work, the clamp device 17 is unlocked from the material feeding device, so that the work on the upstream side of the rotary cutter easily escapes.
The life of No. 3 is significantly improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cutting method and apparatus, and more particularly to a rotary cutting method and apparatus for improving the life of a rotary cutter by absorbing work escape generated when a pipe-shaped work is cut by a rotary cutter. About.

[0002]

2. Description of the Related Art Conventionally, a rotary cutting apparatus positions and fixes a work at a cutting position, and cuts the work by revolving along a track as a whole while pressing two or three rotating rotary cutters against the work. Things.

More specifically, each of the rotary cutters is rotatably supported by a rotary body rotatable by a drive motor via a cutter holder, and the cutter holders rotate in synchronization with the operation of a fluid pressure cylinder or the like to rotate the rotary body. It swings in a direction approaching and moving away from the center. Therefore, the rotary cutter revolves around the outer periphery of the work while rotating, and gradually cuts the work toward its center.

When a workpiece is cut by the rotary cutting device as described above, one end of the work W is gripped by the material feeding device 101 in FIG. 6 and FIG. It is transferred to the rotary cutter 103 of the cutting device and positioned at a desired cutting position. As shown in FIG. 6, the workpiece W is clamped by the cutter clamping device 105 on the upstream side in the material feeding direction of the workpiece W from the rotary cutter 103 and cut by the rotary cutter 103. Alternatively, as shown in FIG. 7, the downstream side is clamped by another cutter clamping device 107 and cut by the rotary cutter 103.

When the upstream side of the work W is clamped as described above, the end of the work W is kept cut off, which is the main stream of the cutting method in the rotary cutting device. On the other hand, when clamping the downstream side of the work W, the cut product can be transferred to the next step such as chamfering while holding the clamp device 107 by utilizing the clamp device 107 for the cutter.

[0006]

By the way, in the conventional rotary cutting device, the edge of the rotary cutter 103 has a "wedge" shape.
When the workpiece 3 is gradually cut from the outer periphery of the work W toward the center of the work W while rotating and revolving, the cut surface of the work W is formed obliquely. In order to further insert the rotary cutter 103 toward the center of the work W, the cutting edge of the rotary cutter 103 is guided along the cut surface of the work W and slightly warps in the material feeding direction or the direction opposite to the material feeding direction. Will rotate.

When the workpiece W is cut by clamping the upstream side of the rotary cutter 103 (FIG. 6), the cut pieces downstream of the rotary cutter 103 escape to the downstream side, but the downstream side of the rotary cutter 103 is clamped. When the workpiece W is cut by the rotary cutter 103 (FIG. 7),
The rotary cutter 1
The cut piece (product) on the downstream side of 03 does not escape. Moreover, the workpiece W on the upstream side of the rotary cutter 103 is
The work W on the upstream side does not escape because it is held down by 1.

Therefore, after the cutting positioning of the workpiece W in the material feeding direction is completed, the lock of the material feeding device 101 (servo motor lock structure) is released, but the weight of the material feeding device 101 is too large to be sufficient. It was difficult to cause escape. That is, at the moment when the work W is completely cut by the rotary cutter 103, the work W is strictly sheared, so that the work W is plastically deformed into the sheared portion of the work W as shown in FIGS. A protruding “burr B” is generated, and the burr B is hit with the cutting edge of the rotary cutter 103, so that there is a problem that the life of the rotary cutter 103 is significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a rotary cutting method for improving the life of a rotary cutter by absorbing the escape of the work by the rotary cutter generated when the workpiece is cut. And a device.

[0010]

According to a first aspect of the present invention, there is provided a rotary cutting method according to the first aspect of the present invention, in which a workpiece is fed to a feeding apparatus for feeding a pipe-shaped workpiece to a cutting machine. The work held by the clamp device is held by a clamp device which can be freely moved, and the clamp device is locked and fixed to the material feeding device. By moving the material feeding device, the work held by the clamp device is positioned at a cutting position of a cutting machine. ,
After the cutting of the work is started by a rotary cutter of a cutting machine, the clamp device is unlocked from the material feeding device while the work is being cut.

Therefore, after the work is started to be cut by the rotary cutter, the work is cut without slipping from a predetermined cutting position even if the clamp device is unlocked with respect to the material feeding device, since the rotary cutter enters the work. You. Moreover, since the clamp device is much lighter than the material feeding device, even if the rotary cutter moves in the opposite direction to the material feeding direction along the inclined surface of the cut surface of the work,
With the movement of the rotary cutter, the work on the upstream side of the rotary cutter also easily moves in the opposite direction to the material feeding direction together with the clamp device.

As a result, the burr generated on the sheared portion of the work is not hit by the cutting edge of the rotary cutter, so that the life of the rotary cutter is not significantly reduced.

In the rotary cutting method according to the present invention, when the workpiece is positioned at a cutting position of a cutting machine in the material feeding device, the retreat dimension of the workpiece caused by the escape of the rotary cutter when cutting the workpiece is corrected in advance. The cutting position of the work is determined.

Therefore, the workpiece on the upstream side of the rotary cutter also moves in the direction opposite to the material feeding direction together with the clamp device with the movement of the rotary cutter, so that the retraction dimension of the workpiece is accurately measured. It is easily reflected and corrected at the time of cutting positioning.

According to a third aspect of the present invention, there is provided a rotary cutting apparatus including a gripper capable of gripping a pipe-shaped workpiece, transferring the workpiece gripped by the clamp apparatus to a cutting position of a rotary cutter of a cutting machine and positioning the workpiece. And a locking device for locking and unlocking the clamp device to and from the material feeding device is provided for the material feeding device, and the clamping device is slidably provided in the material feeding direction with respect to the material feeding device. It is characterized by the following.

Therefore, the pipe-shaped work is clamped by the clamp device, and the clamp device is locked to the material feeding device and moved integrally with the material feeding device, and the cutting position of the work is positioned on the rotary cutter of the cutting machine. You. After starting the cutting of the work by the rotary cutter, the clamp device is unlocked from the material feeding device. Since the rotary cutter has already entered the work, the work is cut without shifting from the predetermined cutting position even if the clamp device is unlocked from the material feeding device.

Further, as in the first aspect,
Since the clamp device is much lighter than the material feeding device, even if the rotary cutter moves in the opposite direction to the material feeding direction along the inclined surface of the cut surface of the work, the rotary cutter moves with the movement of the rotary cutter. The workpiece on the upstream side of the rotary cutter also easily moves in the direction opposite to the material feeding direction together with the clamp device.
As a result, the burr generated at the sheared portion of the work is not hit by the cutting edge of the rotary cutter, so that the life of the rotary cutter is not significantly reduced.

According to a fourth aspect of the present invention, there is provided the rotary cutting device according to the third aspect, wherein the clamping device is configured to clamp a cylindrical body slidably inserted in a workpiece feeding device in a workpiece feeding direction. An arm is provided, and at the tip of the clamp arm, a work holding portion into which the inner diameter portion of the work can be inserted, and a clamp lever which is rotatable so that the work can be gripped at the work holding portion, and the clamp lever is rotated A clamp rod having a crank piston that reciprocates in the material feeding direction is provided at the rear end of the clamp arm while a push rod that can be freely engaged and disengaged is inserted into the clamp arm. The rear end of the push rod is connected.

Therefore, after the inner diameter portion of the rear end of the work is inserted into the work holding portion at the front end of the clamp arm, the clamp rod is operated and the clamp piston advances in the material feeding direction, whereby the push rod advances. The tip of this push rod is engaged with the crank lever, and the clamp lever rotates to grip the work. The clamp arm is slidable with respect to the material feeding device while holding the work.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotary cutting device according to the present invention will be described below with reference to the drawings, taking a general rotary cutting device as an example.

FIGS. 4 and 5 schematically show the entire rotary cutting device 1 according to an embodiment of the present invention. The rotary cutting device 1 has a work W placed on the right side in FIG. A work table 3 for feeding a predetermined amount of material is provided, and a rotary pipe cutting machine 5 for cutting the work W is provided on the left side thereof. A cutter clamping device 7 for clamping the downstream side in the direction is provided.

The work table 3 is provided with a material feeding device 9 for gripping one end of the work W and transferring the work W to the rotary pipe cutting machine 5 to position the work W at a cutting position. The material feeding device 9 is provided so as to run along the longitudinal direction of the work table 3.

The work table 3 has a stocker 11 for stocking the work W and a plurality of guide rollers (not shown) for feeding the work to the rotary pipe cutting machine 5.

In the rotary cutting device 1, the workpiece W is positioned and fixed to the rotary cutting device 1, and the workpiece W rotates.
The work W is cut by revolving along the track as a whole while pressing the three rotary cutters 13 against the work W.

More specifically, although not shown, for example, each of the rotary cutters 13 is rotatably supported by a rotating body driven by a drive motor via a cutter holder.
The cutter holder swings in a direction in which the cutter holder approaches and separates from the rotation center of the rotating body in synchronization with the operation of the fluid pressure cylinder and the like. Therefore, the rotary cutter 13 revolves around the outer periphery of the work W while rotating, and gradually rotates the work W
In the direction of its center.

Further, referring to FIG.
Is a main body 15 that travels in the longitudinal direction of the work table 3, in other words, along the material feeding direction of the work W, and can grip one end of the work W and slide with respect to the main body 15 in the material feeding direction of the work W. And a lock device 19 for locking and unlocking the clamp device 17 to the main body 15 of the material feeding device 9 and releasing the lock.

More specifically, the clamping device 17 comprises:
The main body 15 of the material feeding device 9 is provided with a clamp arm 23 forming a cylindrical body slidably inserted in the material feeding direction of the work W via a bearing 21 (thrust), and a rear end of the clamp arm 23. Is integrally connected to the clamp arm holder 25 by means such as a screw portion or welding, and the distal end surface of the clamp arm holder 25 is formed so as to be able to abut the main body 15 of the material feeding device 9.

Further, at the tip of the clamp arm 23, there is provided a work holding portion 27 which can be inserted into the inner diameter portion of the work W in order to clamp the end of the pipe-shaped work W. The clamp lever 31 provided with the gripper 29 for pressing and clamping the mounted work W from the outer peripheral surface is provided in the cylindrical body 3 of the clamp arm 23.
3 and is pivotally mounted via a pin 34 so as to be rotatable. The rear part of the clamp lever 31
A portion of the clamp arm 23 facing the inside of the hole 33 has an inclined surface 35 that is inclined rearward in the material feeding direction of the work W. The inclined surface 35 is pressed by an engagement portion 39 at the tip of a push rod 37 described later, and the clamp lever 31 rotates in a direction in which the grip portion 29 at the tip of the portion presses the work holding portion 27.

A push rod 37 is inserted through the inner diameter of the clamp arm 23, and a substantially conical engaging portion 39 tapering toward the tip of the push rod 37 is provided at the tip of the push rod 37. The clamp rod 31 is formed so as to contact the inclined surface 35 of the clamp lever 31, and the rear end of the push rod 37 is connected to the clamp arm holder 2.
5 is connected to the tip of a clamp piston 43 that reciprocates in a clamp cylinder 41 formed therein.

The clamp piston rod 45 at the rear end of the clamp piston 43 passes through an insertion hole formed in a cylinder cover 47 for covering the clamp cylinder 41, and protrudes rearward in the sheet feeding direction. The clamp piston rod 45 is constantly urged via a spring 49 in the direction opposite to the material feeding direction. In order to press the clamp piston 43 in the material feeding direction against the urging force of the spring 49, a compressed air supply path is supplied so that compressed air from a compressed air supply source (not shown) is supplied into the clamp cylinder 41. Are formed on the cylinder cover 47.

The lock device 19 presses the clamp device 17 against the material feeding device 9 in the material feeding direction of the workpiece W to lock and fix the workpiece W. In the example of the present embodiment, a lock cylinder 51 is provided, and a lock piston 5 that reciprocates in the lock cylinder 51 in the material feeding direction.
The lock device main body 55 provided with 3 is fixed to the material feeding device 9. The lock device main body 55 has a lock lever 5 that is engaged with the rod end of the lock piston 53.
The lock lever 57 is pivotally mounted via a pin 59 so that the distal end of the lock lever 57 presses and releases the rear end face of the clamp arm holder 25 of the clamp device 17 in the material feeding direction. It is provided in.

The lock device main body 55 has supply / discharge paths 65 and 67 for supplying or discharging compressed air from a compressed air supply source (not shown) to the dynamic pressure side 61 and the back pressure side 63 in the lock cylinder 51, respectively. Is provided.

The above-described clamp device 17 and lock device 1
9 will be described with reference to FIG.

The inside diameter of one end of the work W is inserted into the work holding portion 27 at the tip of the clamp arm 23. When compressed air is supplied into the clamp cylinder 41 of the clamp arm holder 25 and the clamp piston 43 moves forward in the sheet feeding direction against the urging force of the spring 49, the clamp piston 4
3 is pushed forward, and the engaging portion 39 at the tip of the push rod 37 abuts against the inclined surface 35 of the clamp lever 31 and presses it.
Is rotated and the gripper 29 presses the work W onto the work holding part 27 via the work W to clamp the work W.

On the other hand, the lock cylinder 5 of the lock device 19
When the compressed air from the compressed air supply source is supplied to the dynamic pressure side 61, the lock piston 53 moves forward, and the rear end of the lock lever 57 is pressed by the tip of the piston rod. Is the clamp arm holder 2
Since the rear end surface of the clamp arm holder 25 is pressed against the rear end surface of the cylinder arm 47, that is, the rear end surface of the cylinder cover 47 in the material feeding direction, the rear end surface of the clamp arm holder 25 abuts and is fixed to the material feeding device 9.

The material feeding device 9 which has clamped the work W as described above is moved in the material feeding direction of the work W, is positioned at a desired cutting position of the work W, and is locked on the work table 3 by, for example, a servo motor lock device. You.

After the tip end of the work W is gripped by the cutter clamping device 7 (FIGS. 4 and 5) provided on the downstream side of the rotary cutter 13, the workpiece W is rotated by the rotary pipe cutting machine 5 as shown in FIG. The cutting of the work W is started by the cutter 13.

Thereafter, in FIG. 1, compressed air is supplied to the back pressure side 63 of the lock cylinder 51 of the lock device 19, and at the same time, compressed air in the dynamic pressure side 61 is discharged through the supply / discharge path 65 and the lock piston 53 is released. By returning,
The distal end of the lock lever 57 separates from the rear end surface of the clamp arm holder 25 to release the lock of the clamp arm holder 25.

In FIG. 3, since the tip end of the work W is gripped and fixed by the clamp device 17, the cutting edge of the rotary cutter 13 has a "wedge" shape as the cutting by the rotary cutter 13 proceeds toward the center of the work W. Since it has been cut, it moves from the two-dot chain line to the position indicated by the solid line along the inclined surface 35 of the cut surface of the work W. That is, the center position of the rotary cutter 13 in the width direction moves by the distance A in the direction opposite to the material feeding direction of the work W.

As described above, the clamp arm holder 25
Is released from the locked state to the material feeding device 9 and the clamp arm 23 is movable via the bearing 21.
The upstream side of the work easily moves with the movement of the rotary cutter 13 in the direction opposite to the material feeding direction. Therefore, it is possible to avoid a situation in which the life of the rotary cutter is significantly reduced because the burrs generated in the sheared portion of the work W at the time of cutting are hit with the cutting edge of the rotary cutter 13 as in the related art.

[0041]

As can be understood from the above embodiment, according to the first aspect of the present invention, after the rotary cutter starts cutting the work, the rotary cutter is hardly inserted into the work. The workpiece can be cut without shifting from the predetermined cutting position even when the workpiece is unlocked with respect to the material feeding device, and the rotary cutter can cut the workpiece because the clamping device is much lighter than the material feeding device. Even if the rotary cutter moves in the direction opposite to the material feeding direction along the inclined surface, the workpiece on the upstream side of the rotary cutter can easily move in the direction opposite to the material feeding direction together with the clamp device along with the movement of the rotary cutter.

As a result, the burr generated at the sheared portion of the work is not hit with the cutting edge of the rotary cutter, so that the life of the rotary cutter can be improved.

According to the second aspect of the present invention, the work on the upstream side of the rotary cutter moves in the direction opposite to the material feeding direction together with the clamp device with the movement of the rotary cutter, so that the retreat dimension of the work can be accurately measured. The retreat dimension can be reflected and corrected at the time of cutting positioning of the work.

According to the third aspect of the present invention, the pipe-shaped work is clamped by the clamp device, and the clamp device is locked to the material feeding device and moved integrally with the material feeding device. Can be positioned at the cutting position of the rotary cutter of the cutting machine. Similarly to the above-described effect of claim 1, after starting the cutting of the work by the rotary cutter, even if the clamping device is unlocked from the material feeding device, the rotary cutter has already caught in the work. Can be cut without shifting.

In addition, since the clamp device is much lighter than the material feeding device, the work on the upstream side of the rotary cutter can be easily released together with the clamp device in the direction opposite to the material feeding direction. Since the burr generated on the sheared portion of the work is not hit with the cutting edge of the rotary cutter, the life of the rotary cutter can be significantly improved.

According to the fourth aspect of the present invention, the inner diameter of the rear end of the work is inserted into the work holding portion at the front end of the clamp arm, and the clamp piston of the clamp cylinder advances in the material feeding direction, whereby the push rod is moved. It advances and engages with the crank lever, the crank lever rotates, and the workpiece can be easily gripped. In this way, the clamp device slides on the material feeding device while the crank device grips the work with the clamp arm, so that after the start of cutting the work, even if the work is pushed backward by the rotary cutter in the material feeding direction. In addition, the work can easily escape.

[Brief description of the drawings]

FIG. 1 shows a rotary cutting device according to an embodiment of the present invention, and is a cross-sectional view mainly showing a clamp device.

FIG. 2 illustrates a cutting state of a work immediately after the start of cutting by a rotary cutter.

FIG. 3 shows a state where a work is cut by a rotary cutter.

FIG. 4 is a front view showing a schematic view of the entire rotary cutting device according to the embodiment of the present invention.

FIG. 5 is a plan view showing a schematic view of the entire rotary cutting device according to the embodiment of the present invention.

FIG. 6 is a state explanatory view showing a method of cutting a work by clamping a work on an upstream side of a rotary cutter.

FIG. 7 is a state explanatory view showing a method of cutting a work by clamping a work downstream of a rotary cutter.

FIG. 8 is a longitudinal sectional view of a work in a width direction showing positions of burrs generated when the work is cut by a rotary cutter.

FIG. 9 is a longitudinal sectional view of the work in a longitudinal direction showing positions of burrs generated when the work is cut by the rotary cutter.

[Explanation of symbols]

 Reference Signs List 1 rotary cutting device 3 work table 5 rotary pipe cutting machine 7 cutter clamping device 9 material feeding device 13 rotary cutter 15 main body (of material feeding device 9) 17 clamping device 19 locking device 23 clamp arm 27 work holding portion 31 clamp lever 32 Push rod 41 Clamp cylinder 55 Lock device body 57 Lock lever

Claims (4)

[Claims] 1. A workpiece is gripped by a clamp device that is movable in a workpiece feeding direction with respect to a material feeding device that feeds a pipe-shaped workpiece to a cutting machine, and the clamp device is locked and fixed to the material feeding device. Then, by moving the material feeding device, the work gripped by the clamp device is positioned at a cutting position of a cutting machine, and after starting to cut the work by a rotary cutter of the cutting machine, the clamp device is cut while the work is being cut. A rotary cutting method characterized by being unlocked from a material feeding device. 2. The method according to claim 1, wherein when the work is positioned at a cutting position of a cutting machine by the material feeding device, the cutting position of the work is determined by correcting in advance a retreat dimension of the work caused by escape of a rotary cutter when cutting the work. The rotary cutting method according to claim 1, wherein: 3. A material feeding device for gripping a pipe-shaped workpiece, comprising a gripper capable of gripping the workpiece, transferring the workpiece gripped by the clamp device to a cutting position of a rotary cutter of a cutting machine, and positioning the workpiece. A rotary cutting device comprising: a clamping device that is slidable in a workpiece feeding direction with respect to the device; and a locking device that locks and releases the clamping device with the feeding device. 4. The clamping device is provided with a cylindrical clamping arm slidably inserted in a workpiece feeding direction in a workpiece feeding device, and an inner diameter portion of the workpiece can be inserted into a tip of the clamp arm. A work holding part and a clamp lever which is rotatable to be able to grip the work are provided in the work holding part, and a push rod which can be engaged and disengaged is inserted into the clamp arm so as to rotate the clamp lever. 4. A clamp cylinder provided with a crank piston that reciprocates in a material feeding direction at a rear end of the clamp arm, and a rear end of the push rod is connected to a front end of the clamp piston. The rotary cutting device as described in the above.