JP2000108011A - Wire drive controlling method and device in wire saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire drive controlling method for simply and correctly correcting strain and relaxation occurring at the time of changing the reciprocative travel of a wire in a wire saw. SOLUTION: In a wire saw, strain and relaxation, occurring at the time of changing the reciprocative travel of a wire A, can be corrected by reading the outer diameter change of supplying and recovering reels 1 and 2 through encoders 20 and 21, to input a read value into a computer to operate the read value by comparing the read value with the peripheral speed of a multi-groove roller 3; and based on the operated result, correcting the rotations of servo motors M2 and M3 for driving the reels 1 and 2 via a motor controller in real time to conform the peripheral speed of the reels 1 and 2 to that of the roller 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire driving control method and apparatus for a wire saw, which absorbs tension and relaxation generated in the wire when the wire is switched for reciprocating travel.

[0002]

2. Description of the Related Art A general structure of a wire saw will be described with reference to FIG. 1 showing an embodiment of the present invention. The wire saw is wound around the driving multi-groove roller 3 and the driven multi-groove rollers 4 and 5 many times in the middle of one wire A which is unwound from the supply reel 1 and taken up by the collection reel 2, and a plurality of wires A are arranged in parallel. And a tension control mechanism 7, 8 for absorbing the tension and relaxation generated in the wire A is provided between the cutting portion 6 and the supply reel 1 and between the cutting portion 6 and the recovery reel 2, respectively. It has a structure.

[0003] The wire A in the wire saw as described above
Drive (running) is performed by a service directly connected to the drive multi-groove roller 3.
Bomota M₁And the servo motor directly connected to the supply reel 1.
M ₂And a servo motor M directly connected to the collection reel 2.
₃Driven by the three motors
The wire A is moved by the driving of the
Work on the wire A between the driven multi-groove rollers 4 and 5
The workpiece B on the table 9 is pressed to cut a plurality of pieces at the same time.
Things.

Such a wire saw has three motors M
₁ , M ₂ and M ₃ are driven forward and reverse to make the wire A reciprocate, and the traveling time on the outward path is increased (the number of rotations is increased) and the traveling time on the return path is decreased (the number of rotations is decreased). A new wire is supplied from the supply reel 1 and wound around the recovery reel 2 for each cycle. Therefore, it is necessary to synchronously control the rotational movements of the three motors.

In the reciprocating movement of the wire A, when the wire A is switched, tension and relaxation occur in the wire A. In order to absorb the tension, the wire A is moved between the cutting section 6 and the supply reel 1 and between the collection reel 2. Dancer roll type tension control mechanism 7,
8 are provided.

Conventionally, in order to absorb the tension and relaxation generated in the wire, the movement amount of a moving member that moves up and down due to the tension and relaxation of the wire A is measured via tension control mechanisms 7 and 8, and the movement amount is measured. Accordingly, the rotation amounts of the servo motors M ₂ and M ₃ of the supply reel 1 and the collection reel 2 are corrected.

[0007]

However, such control means cannot cope with a situation where the outer diameters of the supply reel 1 and the recovery reel 2 change every moment. Sometimes, a time lag occurs between the vertical movement amount of the moving member in the tension control mechanisms 7 and 8 and the rotation amount correction of the servo motors M ₂ and M ₃ , and as a result, the motors M ₁ , M ₂ ,
Synchronization control between M ₃ becomes unstable, and difficult to accurately control, Therefore, it has become a cause of deteriorating the wire travel efficiency.

As a means for solving such a problem,
It is conceivable to use a control device that uses a computer capable of high-speed processing, but it requires considerable equipment in both hardware and software, which not only leads to a significant increase in the cost of the device, but also in terms of control operation. But high-level technicians are needed.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to absorb tension and relaxation generated when switching between reciprocating traveling of a wire.
Accurately detects changes in the outer diameter of the supply reel and the recovery reel,
A wire drive control method for a wire saw that can correct the amount of rotation of the motor without a time lag from the start of the reciprocation of the wire, can perform stable and accurate synchronous control between the motors, and can be implemented with equipment and technology that is simple to control. It is to provide a device.

[0010]

In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a multi-groove roller which extends from a supply reel and is wound on a recovery reel. A tension control mechanism that absorbs tension and relaxation generated in the wire between the cutting portion and the supply reel and between the cutting reel and the supply reel and between the supply reel and the collection reel. In the wire saw provided respectively, the change in the outer diameter of the supply reel and the collection reel is read by an encoder, the read value is input to a computer, and the calculated value is compared with the peripheral speed of the multi-groove roller set in the computer in advance, and this is calculated. Based on the calculation result, the rotation of the motor driving the supply reel and the collection reel is corrected in real time via the motor controller, and the peripheral speed of the supply reel and the collection reel is corrected. It is obtained by adopting a configuration to match the peripheral speed of the Tamizo roller.

According to a second aspect of the present invention, in the first aspect of the present invention, the amount of tension or relaxation generated in the wire is detected by a sensor provided in the tension control mechanism, and the detected value is input to a computer. This configuration employs a configuration that corrects the rotation of a motor that drives a supply reel and a collection reel via the motor.

According to a third aspect of the present invention, there is provided a cutting process in which a single wire fed from a supply reel and wound on a collection reel is wound around a plurality of multi-groove rollers many times, and a plurality of wires travel in parallel. A roller attached to an oscillating lever is supplied to a wire saw provided with a tension control mechanism for absorbing tension and relaxation generated in the wire between the cutting section and the supply reel and between the collection reel. An encoder that constantly contacts the reel to detect a change in the outer diameter of the supply reel; an encoder that constantly presses the roller attached to the swing lever to the collection reel to detect a change in the outer diameter of the collection reel; The measurement result of the change in the outer diameter of the supply reel and the recovery reel input from the controller is compared with a preset peripheral speed of the multi-groove roller, and a calculation is performed based on the calculation result. A computer that corrects the rotation of the motor that drives the supply reel and the collection reel in real time via the data controller and matches the peripheral speed of the supply reel and the collection reel with the peripheral speed of the multi-groove roller. It was done.

According to a fourth aspect of the present invention, in the third aspect, the tension control mechanism comprises a tension control mechanism for controlling a motor of the supply reel and a tension control mechanism for controlling the motor of the recovery reel. The control mechanism detects the amount of tension or relaxation generated in the wire by detecting the movement of the detection plate provided on the moving member that moves due to the tension or relaxation generated in the wire, and the detected value. And a plurality of sensors for inputting the values to a computer, and the computer employs a configuration in which the rotation of the motor driving the supply reel and the collection reel is corrected via the motor controller by inputting the detection values from the sensors. It was done.

[0014]

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

FIG. 1 shows the structure of a wire saw provided with a wire drive control device according to the present invention, which is unwound from a supply reel 1 and has guide rollers 10, 11, 12, 13 and 1
The middle of one wire A guided and guided by a guide roller 17 having a traverse mechanism and wound around a collection reel 2 is repeatedly turned by a driving multi-groove roller 3 and a driven multi-groove roller 4, 5 many times. The wire A is wound and forms a cutting portion 6 in which a plurality of wires A travel in parallel, and the tension and relaxation generated in the wire A are absorbed between the cutting portion 6 and the supply reel 1 and between the collection reel 2. The tension control mechanisms 7 and 8 are provided respectively.

The wire A in the wire saw as described above
Drive (running) is performed by a service directly connected to the drive multi-groove roller 3.
Bomota M₁And the servo motor directly connected to the supply reel 1.
M ₂, And a servo motor M directly connected to the collection reel 2
₃Driven by the three motors
The wire A is moved by the driving of the
Work on the wire A between the driven multi-groove rollers 4 and 5
The workpiece B on the table 9 is pressed to cut a plurality of pieces at the same time.
Things.

As described in the section of the prior art, such a wire saw is used when the wire A is switched when the three motors M ₁ , M ₂ , M ₃ are driven forward and reverse to make the wire A reciprocate. It is necessary to absorb the tension and relaxation generated in A. Therefore, it is necessary to incorporate a wire drive control device that absorbs the tension and relaxation of wire A by synchronously controlling the rotational movements of the three motors.

The wire drive control device according to the present invention includes a measurement roller 19 attached to a swing lever 18 constantly pressed against the supply reel 1 and an encoder 20 for detecting a change in the outer diameter of the supply reel 1. The measurement roller 19 attached to the moving lever 18 is constantly pressed against the collection reel 2,
An encoder 21 for detecting a change in the outer diameter of the collection reel 2
And a comparison between the measurement results of the change in the outer diameter of the supply reel 1 and the recovery reel 2 input from the encoders 20 and 21 and the preset peripheral speed of the multi-groove roller 3. The rotation of the motors M ₂ and M ₃ that drive the supply reel 1 and the recovery reel 2 via the motor controller is corrected in real time, and the peripheral speed of the supply reel 1 and the recovery reel 2 matches the peripheral speed of the multi-groove roller 3 Computer.

As shown in FIG. 2, each of the encoders 20 and 21 has one end of a swing lever 18 fixed to its input shaft 22 and a roller 19 rotatably pivoted to the other end of the swing lever 18. Then, the roller 19 is pressed against the wire winding portion of the supply reel 1 or the recovery reel 2 by the spring 23 adjusted between the middle of the swing lever 18 and the fixed portion. Swings, the input shaft 22 of the encoders 20 and 21 rotates, and the encoder 2
Numerals 0 and 21 electrically detect the change in the rotation angle of the input shaft 22 and output it to a computer.

[0020] The tension control mechanism 7 for controlling the motor M ₂ of the supply reel 1 includes a dancer roller 24 placed placed on wire A was lowered from between the guide rollers 11 and 12, the moving member suspended dancer roller 24 A weight 25, a detection plate 26 provided on the weight 25, and a vertical movement of the detection plate 26 are detected to detect the amount of tension or relaxation generated in the wire A. And a plurality of sensors that input signals to the sensor group 27. The sensor group 27 is located above the detection plate 26 when the wire A is in a normal tension state.
And a lower sensor group 28.

The upper sensor group 27 is composed of an abnormality detection sensor a, a large detection sensor b, and a small detection sensor c in order from the top, and the lower sensor group 28 is a small detection sensor d and a large detection sensor d in order from the top. It comprises a sensor e and an abnormality detection sensor f.

In both the forward rotation when the supply reel 1 unwinds the wire A and the reverse rotation when the wire A is wound up, the upper sensor group 27 detects the tension state of the wire A, and the lower sensor group 27 detects the tension state of the wire A. On the contrary, the sensor group 28 detects the relaxed state of the wire A.

[0023] Incidentally, the tension control mechanism 8 for controlling the motor M ₂ recovery reel 2 is entirely same configuration and control conditions as described above tension control mechanism 7, therefore, substitute the description the same reference numerals are applied to the same parts .

FIG. 3 is a block diagram of the control device. The control device (microcomputer) 31 includes a well-known CPU.
32, a memory 33, a back-up rewritable read-out memory, a flash memory 34 in which a program and data for driving control of a servomotor (running control of a wire) are stored in advance, and A motor controller 35 which is hardware for giving commands, a display controller 37 which is hardware for displaying various data (machine operation status, error messages, etc.) on a display 36, input of various data with a keyboard, Operation panel 38 for making changes
A DI / DO input / output interface 39 which is hardware for performing digital input, and an encoder interface 40 for reading input from the encoders 20 and 21. These are buses. 41 are connected.

The DI / DO input / output interface 39 of the controller 31 and the sensor group 2 of the tension control mechanisms 7 and 8
The 7, 28, incidentally, the abnormality detection sensor a, stop the machine as a disconnection during operation of f, the large detection sensor b operates during the wire unwinding the servo motor M ₂ 103%
Fast rotated, when the wire recovery controls slow 97% On the contrary, in the case of large-detecting sensor e At the set at all in the opposite condition, when the wire feeding the small detection sensor c is actuated servo motor M ₂ It is controlled to rotate 101% faster, and to control it as slow as 99% at the time of collecting the wire. In the case of the small detection sensor d, the condition is set to the completely opposite condition. The above percentage can be set arbitrarily and can be changed.

The control device according to the present invention is configured as described above. Next, a control method will be described.

[0027] First, the rotational speed of the outer diameter of a servomotor M ₁ for Tamizo roller 3, is previously input to the controller 31 by the keyboard of the operation panel 38. Thus, the peripheral speed of the multi-groove roller 3, that is, the traveling speed of the wire A is determined.

Next, the initial (starting) supply reel 1
Is measured by the encoder 20 and the collection reel 2
Is measured by the encoder 21, and this is measured by the control device 31.
To enter.

The controller 31 compares the outer diameter of the multi-groove roller 3 with the outer diameter of the supply reel 1 and sets the peripheral speeds of the multi-groove roller 3 and the supply reel 1 to be the same at the start of the wire saw. For example, the outer diameter of the multi-groove roller 3 is 100 mm.
^phi, if the rotation speed 1500rpm of the servo motor _{M 1,} the peripheral speed of 100mm × 3.14 × 1500rpm = 471m / min contrast, the outer diameter of the supply reel 1 is at 200 mm ^phi 4
To obtain a peripheral speed of 71m / min, the rotational speed of the servomotor _{M 2} will be may be 750 rpm.

In the same manner as described above, the peripheral speed of the collection reel 2 is set to be the same as the peripheral speed of the multi-groove roller 3.

[0031] The two sets described above, it reads the rotational speed of Tamizo roller 3 (servomotor M _1), and feeds back the read value to the servo motor M ₃ of the servo motor M ₂ and the collection reel 2 of the supply reel 1 By
The peripheral speeds of the multi-groove roller 3, the supply reel 1, and the collection reel 2 are controlled to be the same.

At the same time, when tension or relaxation occurs in the wire A by the tension control mechanisms 7 and 8, the vertical movement of the detection plate 26 is detected by the sensor groups 27 and 28.
Correcting the rotational speed of the servo motor M ₃ of the servo motor M ₂ and the collection reel 2 of the supply reel 1. This rotational speed is corrected by setting the numerical value and inputting it to the control device 31 in advance. For example, in the case of the supply reel 1, the weight 25 descends during the normal rotation in which the wire A is fed, and the DI / DO input / output interface 39
From the control unit 31, via the motor controller 35, slow to correct the servo motor M _2, the descent of the weight 25 at the time of reverse rotation to carry out the winding of the wire A corrects fast servo motor M ₂ reversed.

As described above, the outer diameter changes of the supply reel 1 and the recovery reel 2 are read (measured) by the encoders 20 and 21, and the measurement results are read by the encoder interface 4.
0 to the servo motors M ₂ and M ₃ via the motor controller 35 of the control device 31 to output the motors M ₂ and M ₃
, The peripheral speed of each reel 1 and 2 is made to match the peripheral speed of the multi-groove roller 3 by continuously correcting the rotation amount of
The tension or relaxation generated in the wire A is absorbed.

[0034]

As described above, according to the present invention, the change in the outer diameter of the supply reel and the recovery reel is read by the encoder, the read value is input to the computer, and the peripheral speed of the multi-groove roller preset in the computer is set. The rotation of the motor driving the supply reel and the collection reel is corrected in real time via the motor controller based on the calculation result. Therefore, the supply reel and the collection with respect to the peripheral speed of the multi-groove roller are corrected. The matching of the peripheral speeds of the reels can be easily and accurately controlled, and the equipment is inexpensive and does not require advanced technology, and is excellent in operability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the structure of a wire saw incorporating a wire drive control device according to the present invention.

FIG. 2 is an explanatory diagram of an operation of an encoder that detects a change in reel outer diameter.

FIG. 3 is a block diagram of a control device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 supply reel 2 collection reel 3 drive multi-groove roller 4, 5 driven multi-groove roller 6 processing section 7, 8 tension control mechanism 18 swing lever 19 roller 20, 21 encoder 31 controller

Claims (4)

[Claims] 1. A cutting section in which one wire fed from a supply reel and wound on a collection reel is wound around a plurality of multi-groove rollers many times, and a plurality of wires run in parallel. In a wire saw provided between the cutting section and the supply reel and between the recovery reel and a tension control mechanism for absorbing the tension and relaxation generated in the wire, the outer diameter change of the supply reel and the recovery reel is read by an encoder, The read value is input to the computer, and the calculated value is compared with the peripheral speed of the multi-groove roller set in the computer in advance. Based on the calculation result, the rotation of the motor that drives the supply reel and the collection reel via the motor controller is performed. In the wire saw, wherein the peripheral speed of the supply reel and the recovery reel is made to match the peripheral speed of the multi-groove roller in real time. Ear drive control method. 2. A motor for driving a supply reel and a recovery reel via a motor controller by detecting the amount of tension or relaxation generated in the wire with a sensor provided in the tension control mechanism, inputting the detected value to a computer, and a motor controller. The method according to claim 1, wherein the rotation is corrected. 3. A cutting section in which a single wire fed from a supply reel and wound on a recovery reel is wound around a plurality of multi-groove rollers many times, and a plurality of wires travel in parallel to form a cutting portion. In a wire saw provided with a tension control mechanism for absorbing the tension and relaxation generated in the wire between the cutting portion and the supply reel and between the collection reel, the roller attached to the swing lever is constantly pressed against the supply reel. An encoder for detecting a change in the outer diameter of the supply reel;
The roller attached to the swing lever is constantly pressed against the collection reel, and an encoder for detecting the change in the outer diameter of the collection reel, and the measurement results of the change in the outer diameter of the supply reel and the collection reel input from both encoders are set in advance. The calculated peripheral speed of the multi-groove roller is compared and calculated, and based on the calculation result,
A wire in a wire saw formed by a computer that corrects the rotation of a motor that drives a supply reel and a recovery reel via a motor controller in real time and matches the peripheral speed of the supply reel and the recovery reel with the peripheral speed of the multi-groove roller. Drive control device. 4. A tension control mechanism comprising a tension control mechanism for controlling a motor of a supply reel and a tension control mechanism for controlling a motor of a recovery reel, wherein both tension control mechanisms are provided by tension or relaxation generated in a wire. By detecting the detection plate provided on the moving moving member and the movement of the detection plate,
A plurality of sensors for detecting the amount of tension or relaxation generated in the wire and inputting the detected value to a computer are formed, and the computer controls the supply reel and the recovery reel via a motor controller by inputting the detected value from the sensor. 4. The wire drive control device for a wire saw according to claim 3, wherein the rotation of the driven motor is corrected.