JP2002346826A - Cut-off apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue a cut-off operation for one piece without any troubles and improve an availability factor by changing a trajectory moving speed of a blade without stopping the cut-off operation in the course of cutting-off, when wear of a blade has been found. SOLUTION: The cut-off apparatus 1 is provided with one X axis speed calculating unit 22c, one Y axis speed calculating unit 22d, and one blade rotational speed monitoring unit 22a for one blade 11b. The blade rotational speed monitoring unit 22a compares a set value and an actual value of the rotational speed of the blade 11b. When some deviation 22e is produced between the two values, the blade rotational speed monitoring unit 22a outputs a command to the X axis speed calculating unit 22c and the Y axis speed calculating unit 22d so that the moving speed of the blade cut-off trajectory is reduced. Thus, the cut-off operation can be continued by compensating a drop of the cut-off efficiency of the blade without facilities for measuring wear of the blade. Therefore, the availability factor of the cut-off apparatus is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device having a blade cutting trajectory control device and a blade rotation control device, and more particularly to a steel pipe cutting device.

[0002]

2. Description of the Related Art When a blade of a cutting device is worn, the resistance to be cut increases, and when the cutting track is to be cut at the same moving speed, the rotating side of the blade is overloaded. In the case of (1), if the cutting is stopped in the middle of the cutting due to the overload trip, or if the overload state is continued, a problem that the blade is fatally damaged occurs, and the operating rate of the cutting device is reduced.

Therefore, in order to prevent the above-mentioned problem in the cutting process, various methods and apparatuses for managing the wear state of the blade have been proposed. For example, in order to manage the wear state of the blade, the empirical value method of replacing the blade when the total of the cutting area exceeds the empirical control value, or the blade edge of the blade after finishing a predetermined amount of cutting A contact method for directly measuring with a measuring instrument, a non-contact method for optically measuring the wear amount of a blade,
According to the individual specifications and cutting conditions of the material to be cut as in No. 1,
An example is a cutting state abnormality detection device including an abnormality detection circuit that determines an abnormality during cutting by comparing theoretical cutting power with actual power.

Japanese Patent Application Laid-Open No. 62-53803 discloses a method of controlling the cutting depth of a blade in order to secure a certain amount of cutting when the occurrence of blade wear is detected by a sensor means. It has been proposed as a technology relating to precision cutting equipment for wafers and the like.

[0005]

However, the empirical method has a problem in that the blade replacement time cannot be accurately obtained because the amount of wear varies depending on the material of the object to be cut and the cutting track.

Further, the contact method and the non-contact method have a problem in terms of capital investment such that a measuring instrument for measuring the amount of wear of the blade is required. Further, the cutting state abnormality detecting device proposed in Japanese Patent Application Laid-Open No. 59-102521 can detect an abnormal state of the blade, but when the abnormal state is detected, the cutting operation is interrupted at most. From the viewpoint of the above, it does not lead to an increase in the utilization rate.

Further, in the case of a material such as a semiconductor wafer which cuts with a cutting margin of several tens of μm left, when the wear of the blade is detected, the product yield is not deteriorated (the target cutting margin is reduced). From the viewpoint of securing), it is effective to change the cutting position so as to increase the cutting depth of the blade.
The cutting device proposed in JP-A-62-53803 is effective.

[0008] However, in a cutting device of the type that completely cuts and separates, such as a steel pipe, when the wear of the blade occurs, the cutting load per blade of the blade is increased if the cutting depth is increased. And further promotes wear of the blades, thereby cutting off prematurely due to an overload trip of the motor and putting the blade at risk of catastrophic damage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. When the blade wear is detected without increasing the equipment for measuring the wear amount of the blade, the orbit moving speed of the blade is determined. It is an object of the present invention to provide a cutting device which can continue one cutting without any problem without stopping in the middle of cutting and can increase the operation rate.

[0010]

In order to achieve the above-mentioned object, a cutting apparatus according to the present invention compares a set value of the number of revolutions of a blade with an actual value of the number of revolutions, and a deviation occurs between these values. At this time, the blade rotation speed control device is configured to issue a command to the cutting trajectory control device to reduce the moving speed of the blade cutting trajectory. By doing so, one cutting can be continued without any problem without stopping during the cutting, and the operating rate can be increased.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cutting device according to the present invention is a cutting device provided with one cutting trajectory control device and one blade rotation speed control device for one blade. The set value of the number of revolutions and the actual value of the number of revolutions are compared, and when a deviation occurs between these values, a command is issued to the cutting trajectory control device to reduce the moving speed of the blade cutting trajectory. .

According to the cutting apparatus of the present invention, the cutting track speed is reduced based on the deviation between the blade rotation speed set value and the actual value during cutting without measuring the amount of wear of the blade. That is, by reducing the feed amount per one pitch of the blade blade, the overload of the motor of the blade rotation drive device due to the wear of the blade is eliminated, and the cutting can be continued without tripping.

A second cutting device according to the present invention is a cutting device having two or more blades in the same plane, wherein the rotation speed setting value of at least one blade and the actual rotation speed value are set. When a deviation occurs, the blade rotation speed control device is configured to issue a command to the cutting trajectory control device to reduce the moving speed of the cutting trajectory of all the blades. It is desirable to configure so as to issue a command to decelerate in synchronization with the speed.

According to the second cutting apparatus of the present invention, when cutting with two or more blades arranged on the same plane, at least one of the rotation speed setting value and the rotation speed actual value is required. When deviation occurs, that is, when blade wear is detected, cutting is performed while reducing the moving speed of the cutting trajectory of all blades to balance the cutting force acting in the circumferential direction of the material being cut during cutting. The cutting can be continued without breaking the balance of the circumferential cutting force acting on the cut material without specially modifying the mechanism for holding the cut material so as not to move.

The holding mechanism referred to here needs to have a holding force that does not allow the material to be cut to move due to the cutting force, and depending on the material and thickness of the material to be cut, Since the holding force is limited because the holding force must not be crushed, it is not preferable to break the balance of the circumferential cutting force acting on the workpiece during cutting. Therefore, in the second cutting device according to the present invention, when a deviation occurs between at least one rotation speed set value and the actual rotation speed value, the moving speed of the cutting trajectory of all blades is reduced. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cutting apparatus according to the present invention will be described below with reference to the embodiments shown in FIGS. FIG. 1 is a diagram illustrating the movement of a blade in an embodiment of the cutting device according to the present invention, FIG. 2 is a diagram illustrating a schematic configuration of the cutting device according to the present invention, and FIG. 3 is a configuration of the cutting device according to the present invention. It is a figure explaining the function of the cutting controller which is an element.

In FIGS. 1 to 3, reference numeral 1 denotes a cutting device according to the present invention. In this embodiment, as shown in FIG. The steel pipe 2 is cut by rotating the two blades 11a and 11b arranged in the direction indicated by the solid arrows while moving the blades 11a and 11b in the circular orbits indicated by the broken arrows in FIG. .

Next, the driving mechanisms of the two blades 11a and 11b arranged above and below will be described with reference to FIG.
In the present embodiment, two blades 11a,
Since the drive mechanism of 11b has the same structure, the description of the blade 11a disposed on the upper side is omitted here, and only the blade 11b disposed on the lower side will be described.

Reference numeral 12 denotes a drive case which houses or arranges respective driving members for rotating and driving the blade 11b in the X-axis direction and the Y-axis direction.
A rotation driving body 13 for rotating the blade 11b is accommodated in 2. Further, on the end surface of the drive case 12, an X-axis driver 14 for moving the rotation axis 11ba of the blade 11b in the X-axis direction and a Y-axis driver 1 for moving the rotation axis 11ba in the Y-axis direction are provided.
5 are attached respectively.

Then, for example, the rotating shaft 1 of the blade 11b
In order to move 1ba in the X-axis direction, the X-axis driving body 14
Is rotated to move the drive case 12 of the blade 11b in the X-axis direction. In order to move the rotation axis 11ba of the blade 11b in the Y-axis direction in the same manner as the X-axis, the Y-axis driving body 15 is rotated and the blade 1 is rotated.
1b by moving the drive case 12 in the Y-axis direction.

The rotary drive 1 of the blade 11b
3, speed detectors 16 to 18 for detecting the speeds of the driving bodies are attached to the X-axis driving body 14 and the Y-axis driving body 15, respectively. The rotation driving apparatus 19 for the blade 11b, the X-axis driving apparatus 20, In the shaft driving device 21, speed instructions 23 to 25 individually given by the cutting controller 22.
, The rotation speed detection signal 26 and the speed detection signal 2 transmitted from the respective speed detectors 16 to 18 to the rotation driving device 19, the X-axis driving device 20, and the Y-axis driving device 21.
7, 28, the X-axis drive 14, Y
Voltage references 29 to 31 for controlling the respective speeds of the shaft driving body 15 are given to the respective driving bodies 13 to 15, and the speeds are controlled so as to match the speed instruction values 23 to 25.

In the cutting controller 22, the blade rotation speed, which is more suitable for the outer diameter, wall thickness, material and temperature of the steel pipe 2,
The trajectory and the moving speed on the trajectory are calculated, and speed instructions 23 to 25 are output to the driving devices 19 to 21 in real time. Particularly in the blade orbit, the X-axis driving device 2
0, the positions of the X-axis and the Y-axis are recognized from the speed detection signals 33 and 34 input in real time from the Y-axis driving device 21, and the speed instructions 24 and 25 are determined so that the blade trajectory matches the trajectory instruction value. are doing. Note that 32 in FIG.
Is a rotation speed detection signal output in real time from the rotation drive device 19 to the cutting controller 22, and 35 is a rotation speed reducer for the blade 11b.

Next, the function of the cutting controller 22 will be described with reference to FIG. The cutting controller 22 includes:
The steel pipe information (outer diameter, wall thickness, material, temperature) for each piece to be cut from the host process computer, the blade rotation speed, and the moving speed of the blade cutting trajectory are set.

The cutting controller 22 includes a blade 11
b rotation monitoring unit 22a and X-axis and Y-axis trajectory calculation units 22
b, X-axis speed calculator 22c, Y-axis speed calculator 22d
It is composed of

Of these, the rotation monitoring unit 2 of the blade 11b
2a is a speed command calculation unit 22aa that outputs the set blade rotation speed to the rotation driving device 19 of the blade 11b.
And an integrator 22ab that integrates a deviation 22e between the rotational speed detection signal 32 of the blade 11b input from the rotary drive device 19 and the speed instruction value 23, and a comparator that compares the integrated value 22f output from the integrator 22ab. 22ac. The integrated value 22f output from the integrator 22ab outputs the deviation of the blade angle during cutting from the ideal cutting.

The comparator 22ac compares the integral value 22f output from the integrator 22ab with an allowable value α (for example, a fixed value at a blade angle of 15 °) while cutting the steel pipe 2, and compares the integrated value 22f with the allowable value α. If the difference between the integral value 22f and the integral value 22f output from the integrator 22ab is smaller than 0 (<0), each of the X-axis speed calculator 22c and the Y-axis speed calculator 22d moves on the orbit as described later. A speed correction instruction 22g is output to reduce the speed.

At this time, when the moving speed of the plurality of blades on the trajectory is changed, the speed correction instruction 2 for one blade is changed.
If 2g is input to the X-axis speed calculator 22c and the Y-axis speed calculator 22d of a plurality of blades, synchronization can be easily achieved.

The speed correction instruction 22g is output on the X-axis and the Y-axis.
It is desirable to change the tangential speed of the Y arc trajectory. In the X-axis speed calculator 22c and the Y-axis speed calculator 22d, V set in real time from the trajectory calculator 22b.
While the speed correction instruction 22g is being input to x and Vy as described above, the speeds of Vx and Vy are corrected according to the following equation using a speed compensation amount function as shown in FIG. 4, for example.

Vx ′ = Vx × speed compensation amount Vy ′ = Vy × speed compensation amount where Vx ′ and Vy ′ are speed command values after speed compensation,
x and Vy are speed command values before speed compensation.

The cutting apparatus according to the present invention is configured as described above. When the blade wears and the load on the blade increases, the cutting device detects a decrease in the actual rotation speed of the motor and detects the decrease in the actual rotation speed of the blade. By reducing the moving speed of the motor, the overload of the motor is eliminated, and one blade can be cut without tripping the rotation of the blade and without fatal damage to the blade, thereby improving the operation rate.

[0031]

As described above, according to the cutting device of the present invention, the deviation between the speed command value and the actual value of the blade rotation drive device can be obtained without the need for equipment for measuring the wear of the blade. By comparing with the permissible values for the outer diameter, wall thickness, material, and material temperature, the cutting speed can be reduced and the cutting efficiency can be compensated for by reducing the cutting efficiency of the blade. The operation rate improves. Also, when cutting with a plurality of blades arranged in the same plane, cutting can be continued while maintaining the balance of the cutting force on the material to be cut, and a special mechanism for holding the material to be cut becomes unnecessary.

[Brief description of the drawings]

FIG. 1 is a view for explaining the movement of a blade in one embodiment of a cutting device according to the present invention.

FIG. 2 is a diagram illustrating a schematic configuration of a cutting device according to the present invention.

FIG. 3 is a diagram illustrating functions of a cutting controller which is a component of the cutting apparatus according to the present invention.

FIG. 4 is a diagram illustrating a moving speed compensation amount function of a trajectory.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting device 2 Steel pipe 11a Blade 11b Blade 13 Rotation drive 14 X-axis drive 15 Y-axis drive 16 Speed detector 17 Speed detector 18 Speed detector 19 Rotation drive 20 X-axis drive 21 Y-axis drive 22 Cutting controller 22a Rotation monitoring unit 22b Trajectory calculation unit 22c X-axis speed calculation unit 22d Y-axis speed calculation unit 22e Deviation 22f Integral value 22g Speed correction command 23 Speed command value 24 Speed command value 25 Speed command value 26, 32 Rotation speed detection signal 27,33 Speed detection signal 28,34 Speed detection signal

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Joe Yasuno 4-4-222 Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Yoneo Nakata 5007 Itozakicho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Mihara Machinery & Transportation Systems Factory F-term (reference) 3C040 AA05 BB18 DD01 3C058 AA03 AA11 AA18 BA01 BA04 BB02 BB09 BC02 CA01 CB03

Claims (3)

[Claims] 1. A cutting device having one cutting trajectory control device and one blade rotation speed control device for one blade, wherein the blade rotation speed control device includes a blade rotation speed setting value and a rotation speed actual value. The cutting device is characterized in that the values are compared, and when a deviation occurs between these two values, a command to reduce the moving speed of the blade cutting trajectory is issued to the cutting trajectory control device. 2. In a cutting device having two or more blades in the same plane, when a deviation occurs between a rotation speed setting value and a rotation speed actual value of at least one blade,
The cutting device according to claim 1, wherein the blade rotation speed control device is configured to issue a command to the cutting trajectory control device to reduce the moving speed of the cutting trajectory of all blades. 3. When a deviation between a rotation speed setting value and an actual rotation speed value of at least one blade occurs, the blade rotation speed controller decelerates the cutting trajectory control device in synchronization with the moving speeds of all blade cutting trajectories. 3. The cutting device according to claim 2, wherein the cutting device is configured to issue a command to perform the cutting.