JP3841544B2 - Method for locating and cutting wire saw and wire - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wire saw that moves a wire while contacting the workpiece and cuts the workpiece, and further relates to a method for specifying the position of the wire in the wire saw and a method for cutting the workpiece using the wire saw.
[0002]
[Prior art]
Wire saws are used as devices for cutting workpieces of various shapes such as magnetic materials, semiconductor materials, and ceramic materials. In this wire saw, the wires fed from the reel on the feeding side toward the reel on the winding side are wound around a plurality of rolls between the reels and arranged at equal intervals, and the abrasive liquid is applied toward the surface of the wires. Abrasive grains that are supplied and dispersed in the abrasive liquid are attached to the wire, and the wire to which the abrasive grains are attached is moved while being in contact with the work, thereby cutting the work into a number of plates at once. It is configured.
[0003]
The length of the wire used in this wire saw is as long as several hundred km. In addition, during use of the wire saw, the wire may break, for example, when the wire is caught on a workpiece or chips, or the wire comes into contact with a place other than the workpiece. When a wire is broken in this way, the wires are connected and connected at the relevant location, and the wire is used again. However, when the wire is used in the middle as described above, it must be used avoiding the knot when the work is cut. In addition, even if the wire breakage does not occur, it may be necessary to use a portion where the wire is broken or a portion where the wire is bent while avoiding that portion when cutting the workpiece.
[0004]
In addition, if the wire reaches the end during the cutting of the workpiece, the cutting is interrupted and the workpiece is wasted. Therefore, if the wire runs low, the wire saw must be stopped at an appropriate time and replaced with a new wire if necessary.
[0005]
Therefore, conventionally, the position of the wire (the wire feed length and remaining amount) is calculated from the outer diameter of the wire wound on the reel, the weight of the wire, etc., and the location where there is a knot or the remaining amount of the wire is specified. Has been done. After the wire saw is in operation, the operation is temporarily stopped just before the position of the knot is fed out from the reel on the feeding side, the wire is moved with the workpiece released, and the knot is wound on the reel on the winding side. The wire saw has been restarted again. This prevents knots from coming into contact with the workpiece. Also, based on the position of the wire calculated from the outer diameter, weight, etc., if it is determined that there is little remaining, it is replaced with a new wire.
[0006]
[Problems to be solved by the invention]
However, since the wire is thin and the weight per unit length is slightly long, the conventional method based on the outer diameter or weight of the wire has a large error, and the position of the knot or the like can be accurately identified. could not. For this reason, it is very difficult to find knots, etc., and if the workpiece is continuously cut without any discovery, the knot will be caught on the workpiece, resulting in new disconnection accidents and workpiece cutting accuracy. It was causing a decline. In addition, in order to replace the wire with a new one, the use of the wire has to be finished with a considerable margin with respect to the total length of the wire, resulting in waste.
[0007]
Accordingly, an object of the present invention is to provide means for accurately identifying the position of a wire used in a wire saw.
[0008]
[Means for Solving the Problems]
In order to achieve this object, in the present invention , in a wire saw that moves a wire that is in contact with the surface of the workpiece and cuts the workpiece, a detection mechanism that detects the cumulative number of rotations of the rotating body that contacts the wire. And storage means for storing an arbitrary position of the wire as an accumulated rotational speed .
[0009]
If an arbitrary position of the wire is specified by the integrated rotation speed of the reel as in this wire saw, the wire position and the integrated rotation speed of the reel have a one-to-one correspondence. Therefore, the position of the wire is determined by the integrated rotation speed. It becomes possible to grasp accurately. In this wire saw, the cumulative revolution speed can be expressed by the cumulative number of rotations of the rotary member in contact with the wire. The rotating body in contact with the wire can be, for example, a reel for winding the wire or feeding out the wire, and can also be a pass roll of the wire. Further, the integrated rotational speed may be an integrated rotational speed of a motor that drives a reel for winding or feeding a wire. Further, the integrated rotational speed may be an integrated rotational speed of a motor that rotationally drives a drive roller that moves the wire.
[0010]
The present invention is a cutting method that uses these wire saws to cut a workpiece by bringing the wire into contact with the surface of the workpiece.
[0011]
In a wire saw in which a wire moved while being wound around a reel is brought into contact with the surface of a work and the work is cut, an arbitrary position of the wire is specified by an accumulated number of rotations, and a wire position specifying method in the wire saw It is. In this location method, the cumulative number of revolutions can be expressed by the cumulative number of rotations of the rotary member in contact with the wire. Rotating body in contact with the wire, for example, a reel for winding or unwinding the wire, the accumulated number of revolutions may be a cumulative number of rotations of the reel for wire winding or unwinding, also, the wire In this case, the integrated rotational speed may be the integrated rotational speed of the pass roll. Further, the integrated rotational speed may be an integrated rotational speed of a motor for rotationally driving a reel for winding or feeding a wire. Further, the integrated rotational speed may be an integrated rotational speed of a motor that rotationally drives a driving roller that moves the wire.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an example of the overall configuration of a wire saw 1 according to an embodiment of the present invention.
[0013]
The wire saw 1 includes a pair of reels 10 and 11 arranged on the left and right sides at a predetermined interval. These reels 10 and 11 are attached to drive shafts 14 and 15 of motors 12 and 13, respectively, and are driven to rotate. In addition, one common wire 16 is wound around these reels 10 and 11, and the wire 16 is stretched between the reels 10 and 11. Further, four pass rolls 17, 18, 19, and 20 are provided between the reels 10 and 11 so as to support the wire 16 from below. Further, a drive roller 21 is disposed below between the pass rolls 18 and 19 positioned inward. Wires 16 are wound around these pass rolls 18 and 19 at equal intervals. Between the reel 10 and the reel 11, the wire 16 contacts the pass rolls 17, 18, and 19, and then turns downward along the peripheral surface of the pass roll 19 to wind the drive roller 21. The direction is changed upward along the surface, the pass roll 18 is wound again, the direction is changed horizontally along the peripheral surface of the pass roll 18, and then the pass rolls 19 and 20 are contacted. The wire 16 is stretched between the reel 10 and the reel 11 in such a manner that the pass rolls 17, 18, 19, the driving roller 21, and the pass rolls 18, 19, 20 are in contact in this order without slack. By rotating the motors 12 and 13, the wire 16 is fed out from the reel 10 and is wound up while being repeatedly advanced and retracted to the reel 11 on the winding side. The drive roller 21 can also be driven to rotate by the motor 22, and the motor 22 is rotated together with the motors 12 and 13 for rotating the reels 10 and 11, or instead of the motors 12 and 13. It is also possible to move 16 forward and backward.
[0014]
A workpiece W is supported by an elevating mechanism 25 above the pass rolls 18 and 19 positioned inward. The work W has a rectangular parallelepiped shape in the illustrated example, and is, for example, a magnetic material, a semiconductor material, a ceramic material, or the like. In addition, although the workpiece | work W is a rectangular parallelepiped shape in the example of illustration, it is not necessarily restricted to this shape, A cylinder, a cube, and other shapes may be sufficient. The work W is lowered by the operation of the lifting mechanism 20, and the lower surface side of the work W comes into contact with the horizontally stretched wire 16 between the pass rolls 18 and 19.
[0015]
Although not shown, a nozzle that supplies the abrasive liquid L toward the surface of the wire 16 stretched between the pass rolls 18 and 19 is disposed, and the abrasive liquid discharged from the nozzle is supplied to the wire 16. Thus, the abrasive grains dispersed in the abrasive liquid are attached to the wire 16. A configuration in which the workpiece 16 is cut into a plate shape by bringing the wire 16 to which the abrasive grains are adhered into contact with the workpiece W and moving the wires 16 forward and backward by the rotational drive of the motors 12 and 13 (or the motor 22). It has become.
[0016]
In the wire saw 1 configured as described above, detection mechanisms 30 and 31 for detecting the accumulated rotational speed are mounted on the reel 10 on the feeding side and the reel 11 on the take-up side, respectively. , 31, the accumulated rotational speed of each reel 10, 11 is stored in the storage means 32. It should be noted that a display device such as a display or a printer for displaying the accumulated number of revolutions of the reels 11 and 12 stored by the storage means 32 may be provided. In the wire saw 1, the reels 11 and 12 may rotate at a speed exceeding the maximum peripheral speed of 10,000 mm / sec. Therefore, the reels 11 and 12 have a response speed that can sufficiently cope with such a high rotation and can move the wire 16 forward and backward. It is preferable to use detection mechanisms 30 and 31 that can discriminate forward rotation and reverse rotation of the reels 11 and 12. As these detection mechanisms 30 and 31, for example, the rotation of the reels 11 and 12 can be detected using an encoder, a phototube, a proximity sensor, etc., and integration can be performed using a counter or the like.
[0017]
In this embodiment, since the detection mechanisms 30 and 31 mounted on the reels 11 and 12 have the same configuration, the detection mechanism 30 mounted on the reel 10 will be described as a representative based on FIG. To do. A mirror 35 is attached to the lower portion of the reel 10 at a position where the wire 16 cannot be wound. Sensors 36 and 37 that detect light passing through the mirror 35 and detect passage of the mirror 35 are provided at predetermined intervals. Is opened and placed. Based on the detection of these sensors 36 and 37, the integrated rotational speed of the reel 10 is detected and stored in the storage means 32. Further, for example, when the reel 10 rotates in the clockwise direction CW and the wire 16 is wound around the reel 10, the detection signal 36a from the sensor 36 is detected from the detection signal 37a from the sensor 37, as shown in FIG. If the reel 10 is rotated in the counterclockwise direction CCW and the wire 16 is fed out from the reel 10, the detection signal 37a from the sensor 37 is detected as shown in FIG. Since the detection signal 36a is detected earlier than the detection signal 36a, the rotation direction of the reel 10 is detected based on the detection time difference between the detection signal 36a and the detection signal 37a, and the state in which the wire 16 is wound and the state in which the wire 16 is being fed out. It is possible to determine. Although the detection mechanism 30 mounted on the reel 10 on the feeding side has been described as a representative, the integrated rotation number is similarly detected and stored in the storage means 32 by the detection mechanism 31 of the reel 11 on the take-up side. At the same time, the state in which the wire 16 is wound and the state in which the wire 16 is being fed are determined.
[0018]
Further, in this wire saw 1, when there is a knot or the like on the wire 16 wound around the reel 10 on the take-out side and the reel 11 on the take-up side, the position is stored in advance as the accumulated rotational speed X of the reels 10 and 11. 32. Further, the number Y of windings of the wire 16 wound around the reel 10 on the feeding side (in a state where the wire 16 has not yet been fed out from the reel 10 on the feeding side) before starting the operation of the wire saw 1 is also stored in the storage means 32. It is remembered.
[0019]
Now, in this wire saw 1, each motor 12, 13 (or motor 22) is driven to rotate, and the wire 16 stretched between the reels 10, 11 is moved in the direction of arrow A in FIG. Let As a result, the wire 16 initially wound on the reel 10 on the feeding side is sequentially fed, and the wire 16 is gradually wound on the reel 11 on the winding side. The feeding of the wire 16 by the reel 10 on the feeding side and the winding of the wire 16 by the reel 11 on the winding side are detected by the detection mechanisms 30 and 31 and stored in the storage means 32 together with the integrated rotational speed.
[0020]
Further, while moving the wire 16 in this manner, the abrasive liquid is discharged from a nozzle (not shown), thereby attaching abrasive grains to the wire 16 stretched between the reels 10 and 11. Then, the work W is lowered by the operation of the elevating mechanism 25, and the lower surface side of the work W is brought into contact with the wire 16. As a result, the workpiece W is cut into a thin plate shape.
[0021]
Here, for example, as shown in FIG. 1, when a knot 16 ′ is present on the wire 16 wound up on the reel 10 on the feeding side, the position of the knot 16 ′ is set as the accumulated rotation speed X of the reel 10. Since the position of the knot 16 ′ and the accumulated rotational speed of the reel 10 have a one-to-one correspondence stored in the storage means 32, the cumulative rotational speed of the reel 10 on the feeding side becomes X as the wire 16 moves. When it is reached, it can be determined that the knot 16 ′ is just unwound from the reel 10.
[0022]
Then, when it is detected that the knot 16 'is fed out from the reel 10 because the accumulated rotational speed of the reel 10 has reached X, the cutting of the workpiece W is temporarily stopped. Then, the wire 16 is moved until the knot 16 'is wound around the reel 11 on the winding side. Note that the position of the wire 16 when the knot 16 ′ is wound around the reel 11 on the winding side is detected by the accumulated rotation speed X ′ of the reel 11 at that time and stored in the storage means 32. Thereafter, cutting of the workpiece W is started again.
[0023]
Then, the wire wound around the reel 10 on the feeding side before the operation of the wire saw 1 is started (when the wire 16 has not yet been fed from the reel 10 on the feeding side). When the number of wires 16 wound around the reel 10 is reduced and the remaining number of wires 16 is reduced, the cutting of the workpiece W is finished and the wire 16 is completely wound around the reel 11 on the winding side. The cutting can be continued by reversing the moving direction of the wire 16. Note that the number of windings when the wire 16 is completely wound around the reel 11 as described above may be detected by the accumulated rotation number Y ′ of the reel 11 and stored in the storage means 32. When the same wire 16 is used for cutting again, the reel 11 on the take-up side so far is used on the feed side, and the reel 10 on the take-up side is used on the take-up side. Then, cut as before. Then, the position of the knot 16 ′ is specified in the same manner.
[0024]
Thus, after the cutting of the workpiece W is completed, the reel can be replaced as necessary to replace the new wire 16, and the cutting of the workpiece W can be resumed. As described above, in the wire saw 1 described in this embodiment, the position of the wire 16 is stored as the accumulated number of rotations of the reels 10 and 11, thereby avoiding the place such as the knot 16 'and the workpiece W. Since a specific position on the wire 16 can be easily detected, there is no fear of causing a new disconnection accident or a reduction in the cutting accuracy of the workpiece W.
[0025]
Although an example of the embodiment of the present invention has been described above, the position of the wire 16 is not limited to the integrated rotational speed of the reels 10 and 11, for example, the integrated rotational speed of the pass rolls 17, 18, 19, 20, or the motor 12. , 13, and the integrated rotation of the drive roller 21. In that case, as shown in the signal path indicated by the alternate long and short dash lines 40, 41, 42 in FIG. 1, the integrated rotational speed of the pass rolls 17, 18, 19, 20, the integrated rotational speed of the motors 12, 13, and the integrated of the drive roller 21. The rotational speed is stored in the storage means 32. Further, the integrated rotational speed of the motor 22 that rotationally drives the drive roller 21 may be detected by the detection mechanism 23 and stored in the storage means 32.
[0026]
Further, in FIG. 1, the example in which the wire 16 is horizontally stretched between the reels 10 and 11 has been described. However, depending on the size of the apparatus, the path of the wire 16 and each of the pass rolls 17, 18, 19, 20 and the driving roller The arrangement of 21 may be changed as appropriate. Further, although the example in which the moving mechanism 25 is lowered from the upper side has been described, the moving mechanism 25 may be lifted from the lower side and the upper surface side of the workpiece W is in contact with the wire 16 and cut. Note that when the wire 16 at the cutting portion is vertical, the moving mechanism 25 moves the workpiece W horizontally.
[0027]
【The invention's effect】
According to the present invention, since the position of the wire is stored as the accumulated number of revolutions of the reel, pass roll, drive roller, motor, etc., the position of the wire and the accumulated number of revolutions have a one-to-one correspondence. The position of the wire can be accurately grasped by the number. For this reason, it is possible to perform a good work cutting work while avoiding breakage points such as knots or bends in the wire. In addition, when the remaining wire is low, it is possible to accurately grasp the wire and replace the wire at an appropriate time.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of the overall configuration of a wire saw according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a detection mechanism for detecting the cumulative number of rotations of a reel.
FIG. 3 is an explanatory diagram of signals detected by a sensor.
[Explanation of symbols]
W Work 1 Wire saw 10, 11 Reel 12, 13, 22 Motor 16 Wire 16 'Knot 17, 18, 19, 20 Pass roll 21 Drive roller 23, 30, 31 Detecting mechanism 32 Storage means 40 The accumulated rotational speed of the pass roll is stored in the storage means. Signal path 41 for storing signal path 42 for storing the accumulated rotation speed of the motor for rotating the reel in the storage means 42 Signal path for storing the accumulated rotation speed of the motor for rotating the drive roller in the storage means

Claims (11)

In a wire saw that moves a wire brought into contact with the surface of a workpiece and cuts the workpiece, a detection mechanism that detects an accumulated rotational speed of a rotating body that contacts the wire , and stores an arbitrary position of the wire as an accumulated rotational speed And a storage means . The wire saw according to claim 1, wherein the rotating body that contacts the wire is a reel for winding the wire or feeding the wire. The wire saw according to claim 1, wherein the rotating body in contact with the wire is a wire pass roll. 2. The wire saw according to claim 1, wherein the integrated rotational speed is an integrated rotational speed of a motor that drives a reel for winding or unwinding a wire. The wire saw according to claim 1, wherein the integrated rotational speed is an integrated rotational speed of a motor that rotationally drives a driving roller that moves the wire. A cutting method for cutting a workpiece by using the wire saw according to any one of claims 1, 2, 3, 4 and 5, and bringing the wire into contact with the surface of the workpiece. A wire saw that moves while being wound around a reel is brought into contact with the surface of a workpiece, and in a wire saw for cutting the workpiece, an arbitrary position of the wire is stored as an accumulated number of rotations of a rotating body that contacts the wire, and the rotating body A method for specifying a position of a wire in a wire saw, wherein when the accumulated rotational speed reaches a stored cumulative rotational speed, it is determined that an arbitrary position of the wire has been fed out. 8. The rotating body in contact with the wire is a reel for winding or unwinding the wire, and the integrated rotational speed is an integrated rotational speed of the reel for winding or unwinding the wire. The method for specifying the position of the wire according to claim 1. 8. The wire position specifying method according to claim 7, wherein the rotating body in contact with the wire is a wire pass roll, and the integrated rotational speed is an integrated rotational speed of the pass roll. 8. The wire position specifying method according to claim 7, wherein the integrated rotational speed is an integrated rotational speed of a motor for rotationally driving a reel for winding or unwinding the wire. 8. The wire position specifying method according to claim 7, wherein the integrated rotational speed is an integrated rotational speed of a motor that rotationally drives a driving roller that moves the wire.

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