Wire saw cutting device and cutting method

Abstract

To provide a wire saw cutting apparatus and a cutting method therefor for realizing an efficient operation by automatically returning a wire after the completion of cutting to the position in the start of the cutting.SOLUTION: A wire saw cutting apparatus 10 comprises: a pair of arm members 50a, 50b; tip pulleys 57; and arm feed mechanism parts 45. The tip pulleys 57 are provided at the tip parts of the arm members 50a, 50b and wind a wire W1 upon cutting. The arm feed mechanisms 45 directly move the arm members 50a, 50b in a direction in which the arm members 50a, 50b extend. Upon the cutting, a block 70 is cut by the wire W1 in the tip pulleys 57 while inserting the respective arm members 50a, 50b into two holes h11, h12. After the cutting, the arm members 50a, 50b and the wire W1 are returned to the positions before the start of the cutting by retreating the arm members 50a, 50b and winding up the wire W1.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present disclosure relates to a wire saw cutting device and method for cutting using a wire. [Background technology]

[0002] When cutting concrete blocks or the like, a wire saw that cuts by rotating a wire at high speed may be used (see, for example, Patent Document 1). The technology described in Patent Document 1 discloses a wire saw cutting device having a main body and a pair of stand sections attached to the main body at a distance from each other. In this wire saw cutting device, the main body has a case member that houses a drive pulley and a first pulley for winding the wire. Each stand section has a hollow offset stand connected to a dust collector and a tip pulley attached to the tip of the offset stand for winding the wire. When cutting, the stand sections of the wire saw cutting device are inserted into two holes formed in the reinforced concrete block, and the wire saw cutting device is placed so that it comes into contact with the reinforced concrete block. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-155220 Summary of the Invention [Problem to be solved by the invention]

[0004] The wire saw cutting device described in the above-mentioned Patent Document 1 is a push cutter. Therefore, before cutting, the wire is wound around the tip pulleys of a pair of elongated offset stands and then placed at the base end (initial position) between these offset stands. After cutting, the wire is positioned so that it connects the tips of the pair of offset stands in a straight line. Therefore, before the next cutting, the wire needs to be loosened and returned to the base end (initial position). Conventionally, the task of loosening the wire to return a long wire to its initial position has been performed manually by a human. [Means for solving the problem]

[0005] A wire saw cutting device for solving the above problems is a wire saw cutting device that uses a wire to cut an object to be cut, and includes a wire driving unit that winds and rotates the wire, a tension applying unit that applies tension to the wire to press the wire against the object to be cut, a pair of arm members whose tips can be inserted into two spaced apart holes formed in the object to be cut, a tip pulley provided at the tip of the arm member that winds the wire when cutting, and a movable mechanism unit that drives the arm member to move the tip pulley in the extension direction of the arm member.

[0006] A cutting method for solving the above problem is a cutting method for cutting an object to be cut by moving the wire of a wire saw cutting device, the wire saw cutting device comprising: a wire driving unit that winds and rotates the wire; a tension applying unit that applies tension to the wire to press the wire against the object to be cut; a pair of arm members each having a tip pulley at its tip that winds the wire when cutting; and a movable mechanism unit that drives the arm members to move the tip pulley in the extension direction of the arm members, and two holes are formed in the object to be cut, spaced apart from each other by the pair of arm members, and the tips of each arm member are inserted into each of the holes, or while the tips are inserted, the wire wound around the tip pulley cuts between the two holes in the object to be cut, and then, when cutting is completed, the movable mechanism unit moves the arm member whose tip is located in the hole to the opposite side from the tip, and winds up the wire. [Effects of the Invention]

[0007] According to the present invention, after cutting is completed, the wire can be automatically returned by machine to the position at the start of cutting, thereby realizing efficient work. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a wire saw cutting device according to an embodiment. [Figure 2] FIG. 2 is a rear view of the wire saw cutting device according to the embodiment. [Figure 3] 1 is a side view of a wire saw cutting device according to an embodiment. [Figure 4] FIG. 2 is a top view of the wire saw cutting device according to the embodiment. [Figure 5] FIG. 2 is a rear view of the main body of the wire saw cutting device according to the embodiment. [Figure 6] FIG. 2 is a rear view of the stand of the wire saw cutting device according to the embodiment. [Figure 7] FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. [Figure 8]FIG. 2 is a plan view of a stand portion of the wire saw cutting device according to the embodiment. [Figure 9] 10A and 10B are explanatory diagrams illustrating an operation before starting cutting of the wire saw cutting device of the embodiment. [Figure 10] 10A and 10B are explanatory diagrams illustrating an operation of the wire saw cutting device of the embodiment immediately after starting cutting. [Figure 11] 10A and 10B are explanatory diagrams illustrating an operation during cutting of the wire saw cutting device of the embodiment. [Figure 12] 10A and 10B are explanatory views of the operation of the wire saw cutting device of the embodiment when the tip of one arm member reaches the end of the hole during cutting. [Figure 13] 10A and 10B are explanatory diagrams illustrating the operation of the wire saw cutting device of the embodiment at the end of cutting. [Figure 14] 10A and 10B are explanatory diagrams illustrating an operation of returning the arm member after the end of cutting of the wire saw cutting device of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of a wire saw cutting device and a cutting method will be described with reference to FIGS. 1 to 4 are a perspective view, a rear view, a side view, and a top view, respectively, of a wire saw cutting device 10 according to this embodiment. Note that the wire W1 is not shown in FIG.

[0010] 1 to 4, the wire saw cutting device 10 includes a main body 20 equipped with a wire W1, and a base 40 disposed below the main body 20. The base 40 includes a pair of arm members 50a, 50b extending horizontally perpendicular to the main body 20. Furthermore, the wire saw cutting device 10 includes a control unit that controls each motor, which will be described later, in order to perform cutting. 5 and 6 are rear views of the main body 20 and the base 40 of the wire saw cutting device 10, respectively.

[0011] (Configuration of main body 20) As shown in FIG. 1, the main body 20 includes a base member 21, a case member 22, an auxiliary base member 24, and frame members F1 and F2.

[0012] The base member 21 is a rectangular parallelepiped block member with openings on the top and bottom. A case member 22 is arranged above the base member 21 so as to cover the openings. The case member 22 has an overall rectangular parallelepiped shape with a width of approximately 1.5 m, a length of approximately 1.3 m, and a width of approximately 0.3 m. The case member 22 is fixed onto the base member 21 so as to extend in the vertical direction. One surface of the case member 22 (the surface at the front in Figure 2) is made of a transparent plate member. Within the case member 22, the wire W1 is arranged in the vertical plane (second surface).

[0013] As shown in Fig. 5, the internal space of the case member 22 accommodates a drive pulley 25, a first pulley 26, a second pulley 27, and a third pulley 28. A wire W1 is wound around each of the pulleys (25 to 28). This wire W1 is a diamond wire used in known dry wire saw cutting devices.

[0014] The drive pulley 25 functions as a wire drive unit, has a larger diameter than the first to third pulleys 26 to 28, and transmits a rotational force to the wire W1. For this reason, a drive motor 30 that rotates the drive pulley 25 is attached to the back surface of the case member 22. In this embodiment, a servo motor is used as the drive motor 30.

[0015] The first pulley 26 is a tension feed pulley that functions as a tension applying unit and applies tension to press the wire W1 against the workpiece. The first pulley is provided with a tension adjusting unit that adjusts the applied tension to a constant level. The first pulley 26 is arranged to be movable in the vertical direction so that the tension can be adjusted by the tension adjusting unit.

[0016] The second pulley 27 is a take-up pulley and is used to take up the wire W1 when cutting is completed. In this embodiment, two second pulleys 27 that move in conjunction with each other are used. Each second pulley 27 is arranged to be movable in the vertical direction, similar to the first pulley 26.

[0017] Between the drive pulley 25, the first pulley 26 and the second pulley 27, a third pulley 28 (guide pulley) is disposed, the position of which is fixed. Slits through which the rotation shafts of the pulleys (26, 27) pass are formed in the front surface (rear surface in FIG. 2) of the case member 22, corresponding to the ranges of movement of the first pulley 26 and the second pulley 27. The slits are covered with a covering member 29. The covering member 29 is made of a flexible material and is arranged around the ranges of movement of the pulleys (26, 27) to close the slits.

[0018] 1, a rectangular parallelepiped auxiliary base member 24 is attached to the front side of the base member 21. A frame member F1 is fixed to the upper surface of this auxiliary base member 24. The frame member F1 has a rectangular frame shape that is open at the bottom. A plurality of frame members F2 are provided to connect the frame member F1 and the rear surface of the case member 22.

[0019] Furthermore, guide bars 31 and 32 are erected on the auxiliary base member 24. These guide bars 31 and 32 are provided at positions corresponding to the first pulley 26 and the second pulley 27. The guide bars 31 and 32 are provided with first and second moving bodies (not shown) of a moving mechanism that moves the first pulley 26 and the second pulley 27, respectively. A moving motor 34 is attached to the first moving body, which moves the position of the first pulley 26 while adjusting the tension. This moving motor 34 moves the first pulley 26 at a speed corresponding to the cutting speed and applied tension of the wire saw cutting device 10. A moving motor (not shown) is attached to the second moving body, which moves the position of the second pulley 27 to wind up the wire W1.

[0020] 2, L-block-shaped mounting members 35a and 35b protruding downward and extending forward are provided at a distance from the underside of auxiliary base member 24. These mounting members 35a and 35b are provided outside arm members 50a and 50b housed in mount unit 40, which will be described later.

[0021] As shown in Fig. 5, a conversion pulley 36a is rotatably attached to the outer right side surface of the mounting member 35a. Furthermore, a conversion pulley 36b is rotatably attached to the outer left side surface of the mounting member 35b. The conversion pulleys 36a and 36b are provided at positions where the ends of the wire W1 wound around the first pulley 26 and the drive pulley 25 are wound around them. The conversion pulleys 36a and 36b convert the extension direction of the wire W1 coming out downward from the case member 22 from a vertical direction to a horizontal direction (front-to-back direction).

[0022] Furthermore, standby pulleys 37, 38 are attached to the undersides of the mounting members 35a, 35b so as to be rotatable in the horizontal direction. These standby pulleys 37, 38 wind the wire W1 when the wire W1 is not wound around a tip pulley 57 (described later) during non-cutting. Furthermore, the standby pulleys 37, 38 convert the extension direction of the wire W1 from the conversion pulleys 36a, 36b from the front-rear direction to the left-right direction.

[0023] As shown in FIG. 2, the standby pulleys 37 and 38 are disposed at the same height as tip pulleys 57 of the arm members 50a and 50b, which will be described later. Therefore, the wire W1 is wound from the standby pulley 38 around the conversion pulley 36b, the drive pulley 25, the third pulley 28, the second pulley 27, the third pulley 28, the second pulley 27, the third pulley 28, the first pulley 26, and the conversion pulley 36a in that order, before reaching the standby pulley 37. As shown in FIG. 8, the distal end pulleys 57 of the pair of arm members 50a, 50b around which the wire W1 is wound when cutting are disposed between the standby pulleys 37, .

[0024] (Configuration of the stand unit 40) 1 has a base portion 41 having a box-like shape with an open front. This base portion 41 has a size corresponding to the base member 21 and auxiliary base member 24 of the main body portion 20 when both ends of these base members (21, 24) are placed on top of it. Furthermore, an opening corresponding to the interior of the case member 22 is provided on the top surface of this base portion 41. If the wire W1 housed in the case member 22 becomes loose, it can be placed inside the base portion 41 through this opening.

[0025] A dust collection cover 43 is provided in front of the base 41. This dust collection cover 43 has a rectangular frame shape and is provided to cover the periphery of an opening provided on the front surface. Furthermore, a seal member (not shown) is attached to the front surface of this dust collection cover 43 so as to protrude. The seal member deforms according to the wall surface of the workpiece that the wire saw cutting device 10 comes into contact with, and tightly seals the connection portion between this wall surface and the dust collection cover 43. Furthermore, two dust collection pipes 43a are provided on one side of the dust collection cover 43, lined up one above the other. The dust collection pipes 43a are connected to a dust collection device (not shown) via a hose (not shown).

[0026] As shown in FIG. 4, a pair (two) of arm feed mechanisms 45 are provided on a fixed plate 44 attached to the base 41. The pair of arm feed mechanisms 45 have the same configuration, but with the left and right reversed. Each arm feed mechanism 45 functions as a movable mechanism that moves the arm members 50a, 50b back and forth. In this embodiment, the arm feed mechanism 45 is a linear motion mechanism that moves the arm members 50a, 50b linearly back and forth. The arm feed mechanism 45 is equipped with a motor 46 that can rotate forward and backward. The motor 46 is fixed by a connection part (not shown) that has a built-in rotation shaft 46a. As shown in FIG. 6, a pinion gear 47 is provided on a rotary shaft 46a of the motor 46.

[0027] 4 have the same configuration, and each have a rod-shaped portion 51 that has a cross-sectional shape of a hollow square frame and extends in the extension direction. A circular pipe 52 is welded to the end of this rod-shaped portion 51. This circular pipe 52 is connected to a dust collector (not shown) via a hose (not shown).

[0028] As shown in Fig. 3, a rack 53 extending in the extension direction is fixed to the underside of the rod-shaped portion 51. This rack 53 meshes with a pinion gear 47 of a rotation shaft 46a of a motor 46 of an arm feed mechanism 45 shown in Fig. 4, so that the entire arm members 50a, 50b move back and forth as the motor 46 rotates.

[0029] 4, a tip pulley 57 is rotatably provided on a tip 55 of the rod-shaped portion 51 via a fixing member 56. This tip pulley 57 winds the wire W1 when cutting. Furthermore, as shown in FIGS. 3 and 7, two guide members 58a and 58b are provided on the rod-shaped portion 51 on the tip side of the tip pulley.

[0030] As shown in FIG. 7 , guide members 58a and 58b are disposed above and below each other with a gap equal to the thickness (height) of tip pulley 57. Guide members 58a and 58b are symmetrical about the horizontal axis. Each guide member 58a and 58b is provided with two ball casters as sliding members. Each ball caster is disposed at an angle θ1 from the vertical axis. A ball 59 disposed at the tip of each ball caster protrudes radially from rod portion 51 so as to abut against the inner circumferential surface of a hole (core holes h11 and h12 described below) into which rod portion 51 is inserted. In this case, ball 59 of guide member 58a is disposed opposite ball 59 of guide member 58b. When each ball 59 abuts against the inner circumferential surface of the hole (core holes h11 and h12), it supports the tip of rod portion 51 at the center of the hole while abutting against the inner circumferential surface and rolling.

[0031] (Cutting method) Next, a cutting method using the wire saw cutting device 10 configured as described above will be described with reference to Figures 9 to 14. Figures 9 to 14 are plan cross-sectional views for explaining the cutting method. In these figures, cross-sectional hatching has been omitted for the wire saw cutting device 10 to make it easier to see. Also, here, a case will be described in which the block 70 is cut horizontally (horizontal cutting) when cutting out a portion of the reinforced concrete block 70 that is the cutting object. Furthermore, to make it easier to see, the hatching of the horizontally cut portion has been removed.

[0032] As shown in Fig. 9, in this horizontal cutting, first, two holes are drilled. Specifically, two cylindrical core holes h11 and h12 spaced apart are formed in the block 70 using a known core drill. These core holes h11 and h12 are formed at an interval corresponding to the distance between the pair of arm members 50a and 50b. These core holes h11 and h12 are formed to extend horizontally from the side surface of the block 70 (the bottom surface in the figure).

[0033] Next, the wire saw cutting device 10 is installed. Specifically, the lifted wire saw cutting device 10 is placed on the side of the block 70 where the core holes h11 and h12 are open. In this case, the wire saw cutting device 10 is placed so that the centers of the core holes h11 and h12 are aligned with the centers of the arm members 50a and 50b. Then, the wire saw cutting device 10 is pressed against the side of the block 70 so that the sealing member of the dust collection cover 43 is in close contact with the block 70. In this state, the tips of the arm members 50a and 50b are positioned at the same level as or behind the tips of the standby pulleys 37 and 38, and the wire W1 is in its initial position where it is not slackened between the standby pulleys 37 and 38.

[0034] Then, the disconnection process is executed in response to an instruction signal from the control unit. Here, first, the suction start process is executed. Specifically, the dust collector connected to the dust collection pipe 43a of the dust collection cover 43 of the base part 41 and the circular pipe 52 of each arm member 50a, 50b is operated. As a result, air inside the dust collection cover 43, the base part 41, the base member 21, and the case member 22 is discharged through the ends of the dust collection pipe 43a and the circular pipe 52.

[0035] Next, the control unit drives the drive motor 30. This rotates the drive pulley 25, causing the wire W1 wound around the drive pulley 25 to rotate at high speed. In this case, the first pulley 26 is used to perform the initial tension adjustment process. Specifically, in order to keep the tension of the wire W1 constant, the control unit drives the movement motor 34 to move the first moving body in the vertical direction. This adjusts the position of the first pulley 26, thereby adjusting the tension.

[0036] Next, the control unit drives the motor 46 of the right-side arm feed mechanism 45. As a result, the rotational force of the motor 46 is converted into a linear force for the arm member 50a via the pinion gear 47 and the rack 53, causing the arm member 50a to move forward. When the guide members 58a and 58b of the arm member 50a are inserted into the core hole h11, the balls 59 slide while abutting against the inner circumferential surface of the core hole h11. As a result, the arm member 50a is inserted while being guided into the core hole h11.

[0037] 10, when the tip pulley 57 of the arm member 50a moves forward of the tips of the standby pulleys 37, 38, the tip pulley 57 hooks the wire W1, which is rotating at high speed. Then, when the arm member 50a moves further forward, the tip pulley 57 moves forward while pulling the wire W1. In this case, the first pulley 26 moves vertically within the case member 22 in accordance with the tension of the wire W1, adjusting the length and tension of the wire W1.

[0038] Then, as the arm member 50a moves forward, the wire W1 rotates at high speed and cuts the block 70. In this case, the wire W1 wound around the standby pulley 37, the tip pulley 57 of the arm member 50a, and the standby pulley 38 cuts the block 70. When the wire W1 starts cutting the block 70, dust (cutting powder) is generated by the cutting. This cutting powder is sucked into the operating dust collector via the dust collection pipe 43a and the end of the circular pipe 52, and is discharged to the outside of the wire saw cutting apparatus 10.

[0039] 11, after a predetermined time has elapsed since the right-side arm feed mechanism 45 was driven (for example, after the arm member 50a has advanced by 50 mm), the control unit also drives the motor 46 of the left-side arm feed mechanism 45. This causes the arm member 50b to move forward. In this case, as with the arm member 50a, when the tip end 55 of the arm member 50b is inserted into the core hole h12, the arm member 50b is guided into the core hole h12 by the balls 59 of the guide members 58a and 58b.

[0040] Furthermore, when the arm member 50b moves forward, the tip pulley 57 of the arm member 50b hooks the wire W1, which is rotating at high speed, and then moves forward while pulling the wire W1. In this case as well, the first pulley 26 moves in accordance with the tension of the wire W1, adjusting the length and tension of the wire W1.

[0041] As a result, in response to the forward movement of the arm members 50a and 50b, the wire W1 rotates at high speed and cuts the block 70. In this case, the wire W1 wound around the standby pulley 37, the tip pulley 57 of the arm member 50a, the tip pulley 57 of the arm member 50b, and the standby pulley 38 cuts the block 70.

[0042] Thereafter, as shown in Figure 12, the tip 55 of the arm member 50a arrives at the tip of the core hole h11. In this case, the control unit stops the motor 46 of the right arm feed mechanism 45. This stops the forward movement of the arm member 50a. At this time, the motor 46 of the left arm feed mechanism 45 continues to be driven, so that the arm member 50b continues to move forward.

[0043] 13, when the tip 55 of the arm member 50b reaches the tip of the core hole h12, the control unit stops the motor 46 of the left arm feed mechanism 45. This stops the forward movement of the arm member 50b. Furthermore, the control unit stops the drive motor 30. As a result of the above, the region between the core holes h11 and h12 on the side surface side (lower side in the drawing) of the block 70 relative to the wire W1 is cut in the vertical direction on the horizontal plane.

[0044] Next, as shown in Figure 14, the control unit rotates the motors 46 of the pair of arm feed mechanisms 45 in the direction opposite to that during cutting. This causes the arm members 50a, 50b to move backward. In this case, too, the arm members 50a, 50b move while being guided by the balls 59 in the core holes h11, h12. Here, the motor 46 of the right arm feed mechanism 45 may be driven slightly earlier so that one arm member 50a moves back slightly (for example, 50 mm) earlier.

[0045] The wire W1 is wound by moving the second pulley 27 as the arm members 50a, 50b move backward. Here, the length and tension of the wire W1 are adjusted by moving the first pulley 26 in conjunction with the arm feed mechanism 45. In this case, the wire W1 moves in a direction gradually withdrawing from the block 70 via the cutting surface.

[0046] 9, when the tip ends of the arm members 50a, 50b reach a position behind the tip ends of the standby pulleys 37, 38, the control unit stops the motors 46 of the arm feed mechanisms 45. In this case, the wire W1 comes off the tip pulleys 57 of the arm members 50a, 50b and returns to the state before it was cut, where tension is applied between the standby pulleys 37, 38. Then, the dust collector is stopped.

[0047] (action) The wire saw cutting device 10 of this embodiment is equipped with an arm feed mechanism 45 that moves the arm members 50a, 50b back and forth. After cutting the block 70 with the wire W1, the motor 46 of the arm feed mechanism 45 is rotated in the reverse direction to move the arm members 50a, 50b back from a state in which the tip ends of the arm members 50a, 50b are positioned at the back of the core holes h11, h12 (opposite the openings). Accordingly, the second pulley 27 is moved to wind up the wire W1. This returns the arm members 50a, 50b and the wire W1 to their initial positions before cutting began.

[0048] According to this embodiment, the following effects can be obtained. (1) The wire saw cutting device 10 of this embodiment includes an arm feed mechanism 45 that moves the arm members 50a, 50b back and forth. By rotating the motor 46 of the arm feed mechanism 45, the fast-moving wire W1 hooked on the arm members 50a, 50b is pushed forward, cutting the block 70 in a horizontal plane. When cutting is completed, the tips of the arm members 50a, 50b are positioned at the back of the core holes h11, h12 (opposite the openings). From this state, the arm members 50a, 50b are retracted and the wire W1 is wound up. This allows the arm members 50a, 50b and the wire W1 to return to their positions before cutting began, allowing the next cut to be performed efficiently.

[0049] (2) The wire saw cutting device 10 of this embodiment includes a main body 20 extending vertically and a base 40 located below the main body 20. The base 40 includes arm members 50a, 50b that protrude forward and backward from the base 40 and move horizontally, and an arm feed mechanism 45 that linearly moves the arm members 50a, 50b. This allows the tip pulleys 57 of the arm members 50a, 50b, which hook the wire W1 during cutting, to be efficiently moved within the core holes h11, h12.

[0050] (3) The wire saw cutting device 10 of this embodiment includes a main body 20 and a base 40 that can be separated into upper and lower parts. The base 40 includes arm members 50a, 50b to which a tip pulley 57 is attached, which hooks the wire W1 during cutting. The main body 20 includes standby pulleys 37, 38 that are flush with the tip pulley 57 and hold the wire W1 during standby. As a result, the wire W1 that is wound around the tip pulley 57 during cutting is separated from the base 40 and is housed in the main body 20 when not cutting. Therefore, when replacing the wire W1 due to wear or the like, only the main body 20 can be separated from the base 40 and replaced, rather than the entire wire saw cutting device 10.

[0051] (4) In this embodiment, guide members 58a, 58b equipped with balls 59 are provided on the tip portions 55 of the arm members 50a, 50b, respectively, further forward than the tip pulley 57. As a result, the balls 59 at the tips of the arm members 50a, 50b roll while abutting against the inner circumferential surfaces of the core holes h11, h12. Therefore, the arm members 50a, 50b can be smoothly inserted into the core holes h11, h12 while being guided by the balls 59 to be positioned at the centers of the core holes h11, h12.

[0052] (5) In this embodiment, the arm member 50a of the pair of arm members 50a, 50b is cut first. As a result, the force of the arm member 50a moving forward acts as a pressing force on the wire W1, allowing for more efficient cutting than when the pair of arm members 50a, 50b are moved side by side.

[0053] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. The wire saw cutting device 10 of the above embodiment includes arm members 50a, 50b, each having a pinion gear 47 mounted on the rotating shaft 46a of the motor 46 of the arm feed mechanism 45 and a rack 53 attached to the underside thereof that threadably engages with the pinion gear 47. The configuration for moving the distal ends of the arm members 50a, 50b, each of which is provided with a distal pulley 57 around which the wire W1 is wound, back and forth is not limited to the configuration using the rack 53 and pinion gear 47. For example, the arm members 50a, 50b may be moved back and forth using an air cylinder or actuator. Furthermore, the mechanism for moving the distal pulley 57 back and forth is not limited to linearly moving the arm members 50a, 50b back and forth. For example, the arm members 50a, 50b may be configured to be extendable and contract during cutting and after cutting. Specifically, the arm members may be configured as two nested hollow tubular members with rectangular cross sections of different sizes. When cutting, the tube member of the arm member is slid to extend it (moving the tip forward into the hole), and after cutting is complete, it is returned to its nested state to contract it (moving the tip back).

[0054] In the above embodiment, the second pulley 27 is provided in addition to the first pulley 26. Depending on the length of the wire W1 corresponding to the cutting area, the second pulley may be omitted or may be fixed.

[0055] In the above embodiment, during cutting, the arm member 50a advances before the arm member 50b. After cutting, the arm member 50a retreats before the arm member 50b. The method of moving the arm members 50a and 50b in the core holes h11 and h12 is not limited to this. For example, during and after cutting, the two motors 46 may be driven so that the tips of the arm members 50a and 50b are aligned side by side.

[0056] In the wire saw cutting device 10 of the above embodiment, the arm members 50a, 50b are inserted while the block 70 is cut with the wire W1 wound around the tip pulleys 57 at the tips of the arm members 50a, 50b. The cutting method is not limited to cutting while the arm members 50a, 50b are inserted. For example, the arm members 50a, 50b may be inserted into the core holes h11, h12 (first) before cutting. In this case, the wire W1 is wound around the tip pulleys 57 and positioned at the base of the arm members 50a, 50b. Then, during cutting, tension is applied to the wire W1 while the wire W1 is positioned on the side surfaces of the core holes h11, h12 and the side surfaces of the block 70.

[0057] Next, the technical ideas that can be understood from the above-described embodiment and other examples will be described below. (a) A wire saw cutting device as described in any one of claims 1 to 3, characterized in that a sliding member that can rotate while abutting against the inner surface of the hole is attached to the arm member further tip than the tip pulley. [Explanation of symbols]

[0058] θ1...angle, F1, F2...frame members, W1...wire, h11, h12...core hole, 10...wire saw cutting device, 20...main body, 21...base member, 22...case member, 24...auxiliary base member, 25...drive pulley, 26...first pulley, 27...second pulley, 28...third pulley, 29...covering member, 30...drive motor, 31, 32...guide bar, 34...movement motor, 35a, 35b...mounting member, 36a, 36 b...conversion pulley, 37, 38...standby pulley, 40...mounting section, 41...base section, 43...dust collection cover, 43a...dust collection tube, 44...fixing plate, 45...arm feed mechanism section, 46...motor, 46a...rotating shaft, 47...pinion gear, 50a, 50b...arm member, 51...rod-shaped section, 52...circular tube, 53...rack, 55...tip section, 56...fixing member, 57...tip pulley, 58a, 58b...guide member, 59...ball, 70...block.

Claims

1. In a wire saw cutting device that cuts an object using a wire, a wire driving unit that winds and rotates the wire; a tension applying unit that applies tension to the wire to press the wire against the object to be cut; a pair of arm members each having a tip end that can be inserted into two spaced apart holes formed in the object to be cut; a tip pulley provided at a tip of the arm member that winds the wire in a first plane parallel to the extending direction of the arm member when cutting; a standby pulley disposed outside the pair of arm members so as to wind the wire within the first plane; a movable mechanism that drives the arm member to move the tip pulley in the extension direction of the arm member, A wire saw cutting device characterized in that, when not cutting, the wire is detached from the tip pulley and wound around the standby pulley.

2. Further comprising a conversion pulley, the wire driving unit and the tension applying unit wind the wire in a second plane perpendicular to the first plane, The wire saw cutting device according to claim 1 , wherein the conversion pulley changes the winding direction of the wire between the first plane and the second plane.

3. a case member that houses the wire driving unit and the tension applying unit and that positions the wire within the second plane; a main body including the wire driving unit, the tension applying unit, the case member, and the wire; a base unit including the arm member, the tip pulley, and the movable mechanism unit, the base unit being detachably attached to the main body unit and provided below the main body unit, 3. The wire saw cutting device according to claim 2, wherein the wire is detached from the tip pulley and wound around the standby pulley when not cutting.

4. A cutting method for cutting an object by moving a wire of a wire saw cutting device, comprising: The wire saw cutting device is a wire driving unit that winds and rotates the wire; a tension applying unit that applies tension to the wire to press the wire against the object to be cut; A pair of arm members; a tip pulley provided at a tip of the arm member that winds the wire in a first plane parallel to the extending direction of the arm member when cutting; a standby pulley disposed outside the pair of arm members so as to wind the wire within the first plane; a movable mechanism that drives the arm member to move the tip pulley in the extension direction of the arm member, two holes are formed in the object to be cut at a distance between the pair of arm members; The tip of each arm member is inserted into each of the holes, or while the tip is being inserted, a wire wound around the tip pulley is used to cut between the two holes in the cutting object, and then the movable mechanism moves the arm member, whose tip is positioned in the hole when cutting is completed, to the opposite side from the tip, and winds up the wire; A cutting method characterized in that, when not cutting, the wire is detached from the tip pulley and wound around the standby pulley.

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