JP7105433B2 - CUTTING AUXILIARY DEVICE AND WIRE-TYPE CUTTING DEVICE HAVING THE SAME - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act Publication name: Department of Mechanical Engineering, Faculty of Science and Technology, Kindai University Publication name: 2016 Graduation Research Presentation Summaries Publication date: February 8, 2017 [Publications, etc.] Meeting Name: 2016 Graduation Research Presentation Date: February 8, 2017

The present invention relates to a cutting auxiliary device for a wire-type cutting device for cutting wood, metal, concrete, etc., and a wire-type cutting device having the same.

Known methods for dismantling structures include demolition by blasting, demolition by destruction using heavy machinery, demolition by cutting, and the like. Among these methods, the dismantling method by cutting using a cutting device such as a wire saw or a wall saw is suitable for areas where restrictions on noise and vibration are strict.

In particular, the method using a wire saw can be flexibly adapted to the shape of the object to be cut, so it is useful not only for large structures, but also for work in narrow places where large equipment cannot be brought in, or for underwater work. . It can also cut concrete with embedded reinforcing bars, so it is used for demolition of buildings.

FIG. 9 shows a cutting device 102 for a nuclear reactor shielding wall 101 as an example of a conventional wire saw device.

The reactor shielding wall 101 has been exposed to the radiation emitted by the reactor for many years, and has a composite structure of steel and concrete with reinforcing bars densely buried inside, making it extremely difficult to dismantle. For this reason, a method using a wire saw is suitable as a demolition method that can be operated from a remote position and can minimize the impact on the surroundings by accurate cutting.

Referring to FIG. 9(a), in front of the reactor shielding wall 101, a support column 104 is erected with an elevation driving device 103 for raising and lowering a movable guide pulley 105 at its upper end. The lift drive device 103 lifts the movable guide pulley 105 to the cutting position. A column 107 having a guide pulley moving device 106 is arranged in the vicinity of the support column 104 . The guide pulley moving device 106 adjusts the tension of the wire saw 100, which changes with an increase in cutting amount and a change in the height of the movable guide pulley 105, by raising and lowering the adjustment pulley 109. FIG.

Referring to FIG. 9(b), guide pulley moving device 106 is advanced toward reactor shielding wall 101, wire saw 100 is wound around reactor shielding wall 101, and wire saw 100 is circulated. The wire saw 100 in the cutting area passed between the movable guide pulleys 105 is pushed forward while cutting the reactor shielding wall 101 while maintaining an appropriate tension. In this manner, the reactor shield wall 101 can be cut horizontally. The configuration of such a cutting device is described in Patent Document 1.

JP-A-8-194097

As described above, the wire saw is provided with a pulley fixed to the object to be cut, and as the cutting progresses, the excess length of the wire is adjusted by moving the adjustment pulley. However, in such a cutting method, the angle of the wire saw with respect to the object to be cut changes as the cutting progresses.

If the wire saw is not stiff against the object to be cut, there is no particular problem. However, even with the wire saw, if the object to be cut is hard, the wire saw itself may cut the object unless the angle at which the wire saw contacts the object is kept within a certain range. In addition, there is an angle at which the workpiece can be cut most quickly depending on the material of the workpiece, and there is also a demand to keep the cutting angle between the wire saw and the workpiece constant.

In order to keep the cutting angle between the wire saw and the object to be cut constant, it is necessary to appropriately change the position of the pulley fixed to the object to be cut, which is a very troublesome task.

The present invention has been conceived in view of the above problems, and provides a cutting assist device (including a cutting device having the same) that maintains a constant cutting angle between an object to be cut and a wire saw. Furthermore, the assisting device for cutting (the cutting device having it) according to the present invention can also control an appropriate cutting angle as the cutting progresses.

More specifically, the cutting assist device according to the present invention includes:
A cutting auxiliary device for adjusting an angle between a wire of a wire cutting device and an object to be cut,
It has a mechanism part and a control part,
The mechanism unit is
a frame;
a threaded rod whose upper and lower ends are fixedly supported by the frame;
a drive unit that reciprocates on the threaded rod;
a pair of vertically arranged movable pulleys provided in the drive unit;
A potentiometer provided on one pivot of the movable pulley and having a rotational torque of 90 to 300 mN·m; a sensor arm attached to the shaft of the potentiometer; consists of rollers that
Having an angle sensor that measures the angle at which the wire winds around the movable pulley,
The control unit
The driving unit is moved based on the value of the angle sensor.

A wire-type cutting device according to the present invention is a wire-type cutting device having the above-described cutting auxiliary device.

In the cutting assist device according to the present invention, the height of the movable pulley immediately before (or immediately after) the wire saw is paid out (or retracted) to the object to be cut is adjusted to the angle at which the wire saw is paid out (or retracted). The cutting angle between the object to be cut and the wire saw can be maintained within a certain range at all times. In addition, since there is no need to manually change the height of the pulley, and there is no need to perform so-called wire replacement work, the work becomes more efficient.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the cutting auxiliary|assistant apparatus which concerns on this invention, and a wire-type cutting device containing the same. It is a figure which shows the structure of a cutting assistance device. 4 is an enlarged view showing the configuration of a housing and a movable pulley portion; FIG. It is an assembly drawing which shows the structure of a nut part. It is a figure explaining the relationship between the measurement angle of an angle sensor, and a cutting angle. It is a figure which shows operation|movement of a cutting auxiliary|assistant apparatus. It is a figure which shows the processing flow of a control part. It is a figure which shows the modification of a cutting|disconnection auxiliary|assistant apparatus, and a cutting device containing it. It is a figure which shows the conventional cutting device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A cutting auxiliary device according to the present invention and a wire-type cutting device having the same will be described below with reference to drawings and embodiments. In addition, the following description illustrates one embodiment and one example of the present invention, and the present invention is not limited to the following description. The following description can be modified without departing from the spirit of the invention.

(Embodiment 1)
FIG. 1 shows the configuration of a wire-type cutting device 1 (hereinafter simply referred to as "cutting device 1") according to the present invention. The object to be cut by the cutting device 1 according to the present invention is a building or structure (hereinafter referred to as a building or the like). The cutting device 1 is composed of a main body 10 and a cutting auxiliary device 20 . Body 10 may be a conventionally known wire cutting device. Specifically, it has a motor (not shown), a main pulley 12, an auxiliary pulley 14 and a power supply unit (not shown). The wire saw uses a diamond wire 8 (simply referred to as "wire 8"). The diamond wire 8 is a metal wire covered with a special resin containing diamond powder.

The auxiliary cutting device 20 changes the running direction of the wire 8 fed out from the main body 10 and feeds it to the object 9 to be cut. The cutting assist device 20 is provided with a movable pulley 22 for that purpose. The cutting assist device 20 is also provided with an angle sensor 24 that detects the angle of the wire 8 drawn out from the movable pulley 22 . That is, the assisting cutting device 20 detects the angle of the wire 8 drawn out from the movable pulley 22, and changes the position of the movable pulley 22 so that this angle becomes a predetermined angle.

From the standpoint of the cutting auxiliary device 20, feeding the wire 8 toward the object 9 to be cut and feeding the wire 8 from the object 9 to be cut have the same meaning, except that the running direction of the wire 8 is different. be. In this embodiment, the wire 8 is fed out from the cutting auxiliary device 20 to the object 9 to be cut.

Next, FIG. 2 shows a detailed configuration of the cutting assist device 20. As shown in FIG. The cutting assist device 20 has a mechanism section 50 and a control section 60 . In addition, it has a power supply unit (not shown). The mechanism section 50 has a frame 30 , a threaded rod 32 , a housing 34 , a movable pulley 22 and an angle sensor 24 .

FIG. 3 shows the internal configuration of the housing 34. As shown in FIG. The housing 34 is provided with a motor 40 , a motor-side pulley 42 , a transmission belt 44 , a nut portion 46 and a nut-side pulley 48 . A movable pulley 22 is coupled to the housing 34 via an arm 35 . The arm 35 is also provided with an angle sensor 24 for detecting the angle of the wire 8 drawn out from the movable pulley 22 .

First, refer to FIG. The frame 30 is composed of an upper portion 30a, a lower portion 30b, and side portions 30c. The upper portion 30a and the lower portion 30b may be made of a pipe material or a plate material. The side portion 30c has a structure for fixing the upper portion 30a and the lower portion 30b. The rigidity of the frame 30 is ensured by the upper portion 30a, the lower portion 30b, and the side portions 30c.

Upper and lower ends of a threaded rod 32 are fixed to the frame 30 . The threaded rod 32 is a threaded bar. Receptacles (not shown) for fixing the screw rod 32 are formed in the upper portion 30a and the lower portion 30b of the frame 30. As shown in FIG. The structure of the receiving portion is not particularly limited as long as it is fixed to the frame 30 without the screw rod 32 rotating. Rotation of the nut portion 46 (see FIG. 3) arranged in the housing 34 on the threaded rod 32 causes the housing 34 itself to move up and down on the threaded rod 32 .

If the lead of the screw of the threaded rod 32 (the distance the screw advances when it rotates once) is narrow, the accuracy of the amount of movement of the movable pulley 22 (housing 34) can be increased. On the other hand, the torque required for the nut portion 46 to advance the threaded rod 32 increases. Conversely, if the lead of the threaded rod 32 is wide, the accuracy of the amount of movement of the movable pulley 22 (housing 34) will be reduced, but the torque required for the nut portion 46 to advance on the threaded rod 32 may be low.

In the case of the present invention, since the movable pulley 22 is pulled by the wire 8 with a large force, the torque for advancing the nut 46n (see FIG. 4) of the nut portion 46 on the threaded rod 32 should be as low as possible. Therefore, the lead is preferably between 4 mm and 16 mm. In this range of lead, the nut 46n is a lead that naturally descends while rotating on the threaded rod 32 if it is not fixed.

A linear rail 30R is arranged on the frame 30 between an upper portion 30a and a lower portion 30b. The number of linear rails 30R is not limited. Preferably, two are arranged. However, it is sufficient if at least one or more are arranged. The housing 34 is raised and lowered by engaging the linear rails 30R with projections (not shown) provided on the housing 34 . That is, the housing 34 is movably engaged with the linear rails 30R.

Since the housing 34 is engaged with the linear rails 30R, the lifting accuracy is enhanced. If the wire 8 were engaged without the linear rail 30R, all the tension from the wire 8 would be received by the threaded rod 32 and the nut portion 46, and the torque for the nut portion 46 to move on the threaded rod 32 would be applied. becomes higher. Also, since all the tension from the wire 8 is applied to the threaded rod 32 itself, the threaded rod 32 may bend. That is, the linear rail 30R also has the effect of relaxing the tension applied from the wire 8 to the threaded rod 32. As shown in FIG.

Reference is now made to FIG. A motor 40 is fixed to the housing 34 . This motor 40 is an electromagnetic clutch motor. The electromagnetic clutch motor is clutched when the power is turned off, and the drive shaft of the motor 40 and the motor-side pulley 42 do not move. A motor-side pulley 42 is inserted through the drive shaft of the motor 40 . The motor-side pulley 42 rotates together with the drive shaft of the motor 40 .

A nut portion 46 is fixed to the housing 34 . FIG. 4 shows an assembly diagram of the nut portion 46. As shown in FIG. The nut portion 46 has a nut 46n arranged between an upper bearing 46bu and a lower bearing 46bd. A nut-side pulley 48 is arranged around the nut 46n. The nut 46n and the nut-side pulley 48 have male-female outer and inner shapes, and by fitting them together, the nut 46n is fixed with respect to the rotational motion T around the central axis.

That is, when the nut side pulley 48 rotates, the nut 46n also rotates, and if the nut side pulley 48 does not rotate, the nut 46n does not rotate either. That is, when the power of the motor 40, which is an electromagnetic clutch motor, is turned off, the movement of the motor side pulley 42 is locked, and accordingly the movement of the nut side pulley 48 is also locked.

In the auxiliary cutting device 20 according to the present invention, the nut 46n descends the threaded rod 32 while rotating unless it is fixed. However, by using an electromagnetic clutch motor for the motor 40, the housing 34 will not change its current position even when the power is turned off. That is, even if the power supply of the auxiliary cutting device 20 is turned off during cutting, the wire 8 will not change its position, which is safe.

Referring to FIG. 3 again, the upper bearing 46bu and lower bearing 46bd of the nut portion 46 shown in FIG. 4 are fixed to the housing 34 . A nut 46n shown in FIG. A transmission belt 44 is engaged between the motor-side pulley 42 and the nut-side pulley 48 . Therefore, when the motor 40 rotates, the rotation is transmitted to the motor-side pulley 42, the transmission belt 44, the nut-side pulley 48, and the nut portion 46, and the nut portion 46 rotates.

The transmission belt 44 is preferably internally toothed. This is because the torque of the drive shaft of the motor 40 can be transmitted to the nut-side pulley 48 with little loss. Moreover, it is desirable that the transmission belt 44 is made of resin. Here, resin means a range including a rubber material. The auxiliary cutting device 20 moves the position of the movable pulley 22 by moving the housing 34 up and down along the threaded rod 32 . However, it is conceivable that the frictional force with the object to be cut 9 (see FIG. 1) increases, and there may be a case where the housing 34 cannot be moved even if an attempt is made to move it.

In such a case, if the transmission belt 44 is made of resin, tooth jumping occurs and the force to move the housing 34 no longer works. In other words, a kind of safety function is provided without providing a clutch or an emergency stop function between the motor 40 and the nut side pulley 48 .

The housing 34 has a projection (not shown) on its back surface. As already explained, this projection engages with the linear rail 30R provided on the frame 30 (see FIG. 2). The linear rail 30R is a groove-like structure fixed to the frame 30. As shown in FIG. The projection of the housing 34 engages with the groove of the linear rail 30R. The housing 34 moves along the linear rails 30R. The linear rail 30R and the threaded rod 32 are arranged in the same direction.

A movable pulley 22 is arranged in the housing 34 via an arm 35 . Therefore, when the housing 34 moves on the threaded rod 32, the movable pulley 22 also moves. In this sense, the housing 34 may be called a driving section.

Two movable pulleys 22 are desirable, but one may be sufficient. A rotatable connection between the arm 35 and the movable pulley 22 is desirable. This is because it is desirable that there is a degree of freedom in the direction in which the wire 8 is retracted and the direction in which it is drawn out.

More preferably, the movable pulley 22 is a pair of pulleys coaxially arranged and rotatably supported. This is so that the wire 8 can be drawn in from one direction and the wire 8 can be drawn out in another direction.

Referring to FIG. 1, a pair of movable pulleys 22 are arranged vertically. There is no big difference in function and role. One movable pulley 22 is closer to the body 10 and the other pulley is closer to the object 9 to be cut. The movable pulley 22 on the side closer to the main body 10 is not directly connected to the main body 10, and another fixed pulley (for example, the auxiliary pulley 14) may intervene in the middle. On the other hand, the movable pulley 22 close to the object 9 to be cut has no other pulley between it and the object 9 to be cut. An angle sensor 24 is arranged on the movable pulley 22 on this side.

Refer to FIG. 3 again. The movable pulley 22 that sends out the wire 8 is called a feeding pulley, and the pulley that receives the wire is called a retracting pulley. Here, for the sake of explanation, the lower movable pulley 22 is referred to as the feeding pulley 22a, and the upper movable pulley 22 is referred to as the retracting pulley 22b. Of course, the movable pulley 22 on the lower side may be used as the retracting pulley, and the movable pulley 22 on the upper side may be used as the pulley on the delivery side. This is because only the running direction of the wire 8 changes.

An angle sensor 24 is provided near the pulley 22a on the arm 35 on the delivery side. The angle sensor 24 is composed of a potentiometer 24a, a sensor arm 24b, and a roller 24c. A potentiometer 24a is fixed to the arm 35 so that the axis of the delivery side pulley 22a and the axis of rotation are aligned. A sensor arm 24b is attached to the shaft of the potentiometer 24a. A roller 24c is rotatably arranged at the tip of the sensor arm 24b.

The wire 8 delivered from the delivery side pulley 22a is kept in contact with the roller 24c. When the feed angle of the wire 8 changes, the axis of the potentiometer 24a is rotated through the sensor arm 24b. As the shaft of the potentiometer 24a rotates, changes in angle can be detected as changes in resistance.

Here, it is desirable that the shaft rotation torque of the potentiometer 24a is large. When the wire 8 is run, vibration is generated due to deflection of the wire 8 . This vibration applies force to the roller 24c at the tip of the sensor arm 24b. Therefore, if the shaft rotation torque of the potentiometer 24a is small, it will follow this vibration. This is because, in determining the feed angle, many detected angle values become noise.

That is, by increasing the shaft rotation torque of the potentiometer 24a, the angle detection is multiplied by a time constant. Specifically, the shaft rotation torque of the potentiometer 24a is preferably 90-300 mN·m, more preferably 150-250 mN·m.

Refer to FIG. 2 again. A computer including an MPU (Micro Processor Unit), a memory, and an input/output unit 65 can be suitably used as the control unit 60 . The controller 60 is connected to at least the angle sensor 24, the motor 40, and the vertical limiter 30s. The vertical limiter 30s is a switch for notifying when the housing 34 reaches the highest position on the threaded rod 32 and when it reaches the lowest position.

The input/output unit 65 may have any shape as long as it can send an instruction to the control unit 60 from the outside. Further, the input/output unit 65 may be provided with a display unit, which can display the current state of the cutting assist device 20 and the current feeding angle of the wire 8 .

The operation of the auxiliary cutting device 20 having the above configuration and the cutting device 1 having it will be described. 1, 2 and 3, a cutting device 1 according to the present invention is installed mainly near an object 9 to be cut. The case of being outdoors is also sufficiently assumed. When the motor 40 of the auxiliary cutting device 20 is housed in the housing 34, it is possible to avoid a situation in which the motor 40 is caught in dust and stopped even when working outdoors or in the wind and rain. In addition, since the nut portion 46 that rotates on the threaded rod 32 is also arranged inside the housing 34, the influence of dust can be minimized.

A more detailed description will be given. In the auxiliary cutting device 20 according to the present invention, the threaded rod 32 itself does not rotate. If the screw rod 32 is configured to rotate, the driving device such as the motor 40 is arranged at the lower portion 30b or the upper portion 30a of the frame 30. As shown in FIG. Arranging the motor 40 and the like in the lower portion 30b of the frame 30 causes dust to be caught in the driving device. Also, if the motor 40 and the like are arranged on the upper portion 30a of the frame 30, the stability of the auxiliary cutting device 20 itself deteriorates. In other words, it becomes easy to fall down. Placing the drive within the housing 34 avoids such problems.

The wire 8 is fed from the main body 10 to the auxiliary cutting device 20, from the auxiliary cutting device 20, through the object 9 to be cut, and back to the main body 10 (the direction of travel of the wire 8 is for illustration purposes only; direction.). Separately fixed pulleys 13 and auxiliary pulleys 14 may be interposed between the main body 10 and the cutting auxiliary device 20 and between the object 9 and the main body 10 .

After finishing the arrangement of the wire 8, the cutting angle is set in the auxiliary cutting device 20. - 特許庁Setting is performed via the input/output unit 65 of the control unit 60 .

Next, the main body 10 is driven and the wire 8 is run. The cutting auxiliary device 20 moves the housing 34 in the direction of cutting the object 9 to be cut. During this movement, the feed angle of the wire 8 is obtained through the angle sensor 24 . Then, when the feeding angle of the wire 8 reaches a predetermined angle, the housing 34 stops. While the housing 34 is stopped, the object 9 is cut only by the cutting angle between the object 9 and the wire 8 .

As the cutting progresses, the angle between the object 9 to be cut and the wire 8 becomes shallower. Then, when the predetermined angle is obtained, the housing 34 is moved until the predetermined angle is obtained again.

5A shows the relationship between the angle θ measured by the angle sensor 24 (see FIG. 3) and the cutting angle φ of the object 9 to be cut. FIG. 5(b) is a partially enlarged view of FIG. 5(a). The object 9 to be cut has a circular cross section, but the principle is the same even if it has another shape. The wire 8 runs along a tangential line between the feeding-side pulley 22a and the object 9 to be cut. A potentiometer 24a (see FIG. 3) of the angle sensor 24 can measure the angle θ from the horizontal. The angle θ is called the measurement angle θ.

Let R be the radius of the feed-out side pulley 22a, r be the radius of the roller 24c of the angle sensor 24, and Ram be the length of the sensor arm 24b. The intersection point of the virtual extension of the sensor arm 24b and the wire 8 is defined as the intersection point a. Let ram be the distance between the intersection point a and the center of the roller 24c. The point b is the point of contact between the feeding-side pulley 22a and the wire 8, the point o is the center of the feeding-side pulley 22a, and the point o' is the center of the roller 24c.

The angle from the tangential line of the point where the wire 8 contacts the object 9 is called the "cutting angle". Further, the angle from the tangent line at the point where the wire 8 contacts the feeding-side pulley 22a is defined as the "feeding angle". Clearly the cut angle and payout angle are the same. Let this be φ.

In addition, when the running direction of the wire 8 is reversed and the delivery side pulley 22a in the present embodiment becomes the retraction side pulley, the angle φ may be called the "retraction angle". The cutting angle φ refers to an angle based on the measured angle θ that can be measured by the angle sensor 24, and in the case of the present embodiment, refers to the extension angle. In Embodiment 2, both the feed angle and the retraction angle can be measured by the angle sensor 24. In this case, the cutting angle is distinguished like the feed angle and the retraction angle.

Referring to FIG. 5(b), from the relationship between triangle aob and triangle ao'c, ram:(Ram+ram)=r:R, so ram=(r/(R+r))×Ram (" "/" represents division and "x" represents integration). Therefore, cos β=R/(Ram+ram). That is, the angle β (∠aob) can be uniquely obtained from the radius R of the feed side pulley 22a, the length Ram of the sensor arm 24b, and the radius r of the roller 24c, which can be determined by design.

The cutting angle φ can be obtained by 90−α, and α can be obtained by β−θ. Since the angle β is known as described above, the cutting angle (=extension angle) φ can be obtained from the angle θ measured by the angle sensor 24 .

The cutting assist device 20 can perform cutting while always maintaining the angle θ measured by the angle sensor 24 . That is, the cutting can proceed while maintaining the cutting angle φ constant.

FIG. 6 shows this situation. FIG. 6(a) shows the state of starting cutting. A wire 8 is in contact with the upper end of the object 9 to be cut. Referring to FIG. 6B, as the cutting progresses, the angle θ measured by the angle sensor 24 becomes shallower. Then, the delivery side pulley 22a descends by the amount of the arrow B until the angle θ measured by the angle sensor 24 reaches a predetermined value.

FIG. 7 shows the flow of processing performed by the control unit 60 at this time. When the process starts (step S100), initialization is performed (step S102). As an initial setting, at least the cutting angle φ is set.

In addition, it is also possible to input the cutting distance, the cutting direction (moving direction of the housing 34), and the like. Here, since the wire 8 is hung over the object 9 to be cut, the housing 34 is moved downward. However, in some cases, the wire 8 is hung from below the object 9 to be cut, and the cutting is performed while the housing 34 is raised.

The cutting angle φ may be the target angle θ1 of the measured angle θ of the angle sensor 24 . It is assumed that the wire 8 is set at an angle shallower than the cutting angle φ before cutting.

Further, in the following description, it is assumed that the control unit 60 makes a determination based on the angle θ measured by the angle sensor 24 . However, since the measurement angle θ and the cutting angle φ can be uniquely converted, the following description may be controlled by the cutting angle φ.

When the target angle θ1 is input and cutting is started, the control unit 60 drives the motor 40 in the housing 34 to gradually move the movable pulley 22 (step S104). Note that moving here means lowering the movable pulley 22 . Lowering the movable pulley 22 means lowering the housing 34 itself. When the housing 34 is lowered, it is determined whether or not the cutting is completed each time the minute distance ΔL is lowered (step S106). The minute distance ΔL may be a value determined in advance as a design value. Alternatively, it may be a value determined at the time of initial setting.

When the cutting is completed (Y branch of step S106), the descent is stopped there (step S120). In that case, the input/output unit 65 may indicate that the disconnection has been completed.

If the cutting has not been completed (N branch of step S106), it is determined whether or not the measured angle θ is greater than or equal to θ1 (step S108). If the measured angle θ is not equal to or greater than θ1 (N branch of step S108), the process returns to step S104 and the movable pulley 22 continues to descend.

When the wire 8 abuts on the object 9 and the movable pulley 22 is further lowered, the measured angle θ increases. When the measured angle θ becomes equal to or greater than θ1 (Y branch of step S108), it is then determined whether or not the measured angle θ becomes smaller than θ1−Δθ (step S110). This determination is repeated while the measured angle θ is greater than θ1−Δθ (N branch of step S110). This means that the movable pulley 22 is maintained at a constant position while the angle θ measured by the angle sensor 24 is in the range of θ1 to θ1-Δθ. That is, the cutting angle φ is maintained constant with an accuracy of Δθ with respect to the measured angle θ.

When the measured angle θ becomes smaller than θ1−Δθ (Y branch of step S110), the process returns to step S104 and the movable pulley 22 continues to descend. As described above, the cutting device 1 including the auxiliary cutting device 20 according to the present invention can proceed with cutting while maintaining the cutting angle φ with respect to the object 9 to be cut at a constant width.

(Embodiment 2)
FIG. 8 shows a modification of the cutting device according to the invention. A cutting device 1b according to the present embodiment has two mechanical units 50 of the auxiliary cutting device 20 described in the first embodiment. They are referred to as a first mechanism portion 50a and a second mechanism portion 50b, respectively. There is one controller 60 . That is, one control unit 60 controls two mechanical units.

The operation of the cutting assistance device 20 having the configuration as described above will be described. The wire 8 passes from the main body 10 through the first mechanism portion 50a, through the object 9, and returns to the main body 10 through the second mechanism portion 50b. In the first mechanism portion 50a, the feeding angle φ1 at which the wire 8 is fed out to the object 9 is measured from the measured value by the angle sensor 24 of the first mechanism portion 50a. On the other hand, in the second mechanism section 50b, the retraction angle φ2 of the wire 8 from the object 9 to be cut is measured from the measurement value by the angle sensor 24 of the second mechanism section 50b.

With such a configuration, it is possible to separately set and control the delivery angle φ1 and the delivery angle φ2 with respect to the object 9 to be cut. In other words, the cutting can be proceeded by keeping the delivery angle φ1 and the retraction angle φ2 constant. In addition, it is possible to perform control such that the feeding angle φ1 and the feeding angle φ2 are changed according to the progress of cutting.

Such control is particularly effective at the start of cutting the object 9 to be cut. For example, at the beginning of cutting, in order to leave a cut mark, the extension angle φ1 is set deep and the retraction angle φ2 is set shallow. Then, once the cutting marks are formed, the carry-in angle φ2 is also deepened.

That is, by arranging two mechanical units, it is possible to change the feeding angle and feeding angle of the wire 8 with respect to the object 9 to be cut even during the cutting work. The process can be automated.

INDUSTRIAL APPLICABILITY A cutting auxiliary device according to the present invention and a wire-type cutting device having the same can be suitably used when using a wire saw.

1, 2 Cutting device 8 Wire 9 Object to be cut 10 Main body 12 Main pulley 14 Auxiliary pulley 13 Pulley 20 Cutting auxiliary device 22 Movable pulley 24 Angle sensor 24a Potentiometer 24b Sensor arm 24c Roller 22a Delivery side pulley 22b Feeding side pulley 30 Frame 32 Screw Rod 34 Housing 35 Arm 30a Upper portion 30b Lower portion 30c Side portion 30R Linear rail 30s Vertical limiter 40 Motor 42 Motor-side pulley 44 Transmission belt 46 Nut portion 48 Nut-side pulley 46n Nut 46bu Upper bearing 46bd Lower bearing 50 Mechanism portion 60 Control portion 65 Input/output section θ Measurement angle φ Cutting angle

Claims (6)

A cutting auxiliary device for adjusting an angle between a wire of a wire cutting device and an object to be cut,
It has a mechanism part and a control part,
The mechanism unit is
a frame;
a threaded rod whose upper and lower ends are fixedly supported by the frame;
a drive unit that reciprocates on the threaded rod;
a pair of vertically arranged movable pulleys provided in the drive unit;
A potentiometer provided on one pivot of the movable pulley and having a rotational torque of 90 to 300 mN·m; a sensor arm attached to the shaft of the potentiometer; consists of rollers that
Having an angle sensor that measures the angle at which the wire winds around the movable pulley,
The control unit
A cutting assist device, wherein the drive unit is moved based on the value of the angle sensor. 2. A cutting assist device according to claim 1, comprising a plurality of said mechanism units. 3. The assisting device for cutting according to claim 1, wherein the driving part is movably engaged with a linear rail fixed to the frame. The drive unit
a housing coupled with the movable pulley;
a nut screwed onto the threaded rod and rotatably fixed to the housing;
a nut-side pulley arranged around the nut;
a motor fixed to the housing;
a motor-side pulley attached to the motor;
4. The assisting device for cutting according to claim 1, further comprising a transmission belt engaged with said nut-side pulley and said motor-side pulley. 5. A cutting assist device according to claim 4, wherein said motor is an electromagnetic clutch motor. A wire cutting device comprising a cutting auxiliary device according to any one of claims 1 to 5.

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