JP4014046B2 - Cutting method and apparatus by wire saw - Google Patents

Description

  The present invention relates to a method of cutting a tubular body, for example, a wire saw that continuously cuts a metal steel pipe with an endless wire saw, and an apparatus therefor.

  Conventionally, a cutting method using a wire saw, for example, as shown in FIG. 6, a general wire saw or a metal cutting wire saw 3 is wound around a cutting object 2 such as a number of steel pipes arranged at a certain interval. The wire saw 3 is circulated by the cutting device 11 at a high speed, the cutting device 11 is pulled backward with a weight, and a constant tension is applied to the wire saw 3 and cutting is known. . In addition, arrangement | positioning of a guide pulley accompanies the replacement work to an appropriate transmission for every cutting node.

  In such a cutting method, as shown in FIG. 7, the dimension between the position of the guide pulley 15 disposed close to the cutting object 2 and the rear end position of the steel pipe 2 to be cut is set to the pulley. Assuming the distance s, as shown in FIG. 5B, the greater the pulley distance s, the larger the winding angle, and the more efficient cutting and shortening the cutting time. Therefore, in order to increase the cutting efficiency, it is advantageous to increase the pulley distance s.

Moreover, what can adjust the angle of the wire saw 3 according to the installation condition of a cutting target object is known (refer patent document 1).
JP 2002-36231 A

  However, in the conventional cutting method using a wire saw, as shown in FIG. 8, when the cutting object 2 is completely cut and the wire saw 3 is detached from the cutting object 2, the tension of the wire saw 3 is instantaneous. However, the faster the circulation speed is, the more the wire saw 3 may spring up and disengage from the guide pulley 15. When the pulley distance s is increased, the wire saw 3 is easily detached from the guide pulley 15.

  As described above, it is advantageous to increase the pulley distance s in order to shorten the cutting time. On the other hand, considering the safety when cutting is completed, the pulley distance is set so that the wire saw 3 does not come off the guide pulley 15. It is better to shorten s.

  Thus, at the time of cutting completion, in order to prevent the wire saw from falling off from the guide pulley, the wire saw must be used with reduced cutting ability, resulting in a long construction period. This is a problem that must be solved in the past.

The gist of the wire saw cutting method according to the present invention for solving the above problems is to wrap the wire saw around the object to be cut, guide it with a guide pulley while applying tension to it, and wind it endlessly. A moving pulley disposed at a position closest to the object to be cut among the guide pulleys, when the wire saw is removed from the object to be cut after completion of the cutting. In order to prevent the saw from bouncing off from the moving pulley, it is moved toward the object to be cut, so that the distance between the cutting position of the wire saw and the position of the moving pulley is within a predetermined range . A sensor provided on a moving pulley disposed at a position closest to the object to be cut to measure a distance or angle of a wire saw; There is provided a control device for instructing to move the moving pulley when the distance is less than or greater than a predetermined distance and angle, and a moving device controlled to move the moving pulley in accordance with a command from the control device. It is that you are.

Further, the gist of the cutting method using the wire saw according to the present invention is that the wire saw is wound around the object to be cut, guided by a guide pulley while applying tension thereto, wound endlessly, and this is circulated and cut. A method for controlling the moving pulley so that an interval between the cutting position of the wire saw and the position of the moving pulley disposed at a position closest to the object to be cut is within a predetermined range. It is to cut | disconnect the said cutting target object continuously, making it move through a moving apparatus.

  The gist of the wire saw device according to the present invention for solving the above-mentioned problems is to wrap a wire saw around an object to be cut, guide it with a guide pulley while applying tension to the object, and circulate it. A device for measuring a distance or an angle of a wire saw provided on a moving pulley disposed at a position closest to the object to be cut, and a predetermined distance and angle connected to the sensor Alternatively, at least the control device that commands the moving pulley to move and the moving device that is controlled to move the moving pulley according to the command from the control device are provided.

  The cutting method by the wire saw according to the present invention efficiently cuts the object to be cut, and when the cutting is about to be completed, the moving pulley moves within a predetermined range from the cutting position of the wire saw by the sensor and the control device. Therefore, the cutting efficiency is maintained high while the wire saw is being cut, and the wire saw is not detached from the moving pulley when the cutting is completed, and an excellent effect is achieved that safety is ensured.

In addition, by always keeping the distance between the cutting position of the wire saw and the position of the moving pulley disposed at the position closest to the object to be cut within a predetermined range, Can be maintained so as not to come off, ensuring safety.
According to the wire saw device of the present invention, the moving pulley disposed at the position closest to the object to be cut is moved closer to the cutting position of the wire saw when necessary, or always moved within a predetermined range. It can be controlled, and an efficient cutting operation can be ensured, and when the cutting is completed, the wire saw can be prevented from falling off from the moving pulley.

When the wire saw completes cutting the object to be cut, the object is achieved by moving the moving pulley closer to the object to be cut so that the wire saw does not come off the moving pulley. Moreover, it is achieved by providing a sensor, a control device, and a moving device so that the wire saw device can move the moving pulley.
The movement of the moving pulley is controlled so that the distance between the moving pulley in the wire saw device and the wire saw wound around the object to be cut is always constant.
Examples of the present invention will be described below. In order to facilitate understanding of the invention, portions corresponding to those according to the conventional example will be described with the same reference numerals as those of the conventional example.

  The schematic configuration of the wire saw device 1 according to the present invention is, as shown in FIG. 1, a wire saw 3 that is wound endlessly on a cutting object 2 such as a metal pipe (steel pipe) and circulated, A cutting device 4 that circulates the wire saw 3, a guide pulley 5 that guides the circulation of the wire saw 3, a moving pulley 6 that is disposed at a position closest to the cutting object 2 among the guide pulleys, A weight 7 that applies a predetermined tension to the wire saw 3 by pulling the cutting device 4 rearward, and a moving rail in which a rack is engraved and laid on the upper part to smoothly move the moving pulley 6 in the front-rear direction. 8 and a moving device comprising: a moving motor 9 that rotatably supports the moving pulley 6; and a gear 10 that is rotationally driven by the motor 9 and meshed with the rack. 1, it consists of a control unit (not shown) to control the movement of the said mobile device 11.

  As shown in FIG. 2, the moving pulley 6 is provided with a sensor 12 for measuring the distance or angle between the pulley 6 and the wire saw 3. With this sensor 12, the control device discriminates whether the wire saw 3 being cut is immediately after the start of cutting or is nearing completion of cutting. For example, as shown in FIG. 3, when measuring and determining the distance to the wire saw 3, as shown in FIG. 3A, immediately after the start of cutting, the distance of the wire saw 3 to the moving pulley 6 is It is far from the sensor 4 and is not detected. Therefore, the control device holds the moving pulley 6 in the same position and does not move it.

  Next, when the cutting operation proceeds and the steel pipes 2a and 2d as the object to be cut are cut and the inner steel pipes 2b and 2c are cut as shown in FIG. As described above, the position of the wire saw 3 is gradually inclined inward in a plan view, and the distance from the sensor 12 is shortened. When this is within the range of the set distance α, the control device connected to the sensor 12 commands to drive the motor 9 of the moving device 11 to rotate in a predetermined direction.

  Thereby, the gear 10 rotates in a predetermined direction and meshes with the rack of the laid rail 8, so that the moving device 11 approaches the cutting object 2. Accordingly, the moving pulley 6 approaches the cutting object 2 as shown in FIGS. 3B and 3C, and the wire saw 3 as shown in FIG. If the sensor 12 detects that the distance has been reached, the movement of the moving device 11 is stopped by a command from the control device.

  Thereby, even if the cutting operation by the wire saw 3 is completed and the wire saw 3 is detached from the object 2 to be cut, the moving pulley 6 has already completed the approaching movement, so the wire saw 3 jumps and dances. There is no. Therefore, the wire saw 3 does not come off from the moving pulley 6.

  The forward speed of the moving device 11 approaching the cutting object 2 is adjusted by the control device according to the degree of progress of the rate at which the distance becomes shorter or the rate at which the angle becomes smaller by grasping the distance or angle by the sensor 12. Is.

  The sensor 12 measures the distance between the sensor 12 and the wire saw 3 in the moving pulley 6. However, the present invention is not limited to this, and the wire pulley 3 gradually moves as the cutting operation proceeds. Therefore, the angle changed from the initial state may be measured.

  As shown in FIG. 4, when the wire saw 3 starts cutting, the angle θ detected by the sensor 12 is large, so the moving pulley 6 does not move, but as shown in FIG. Then, the angle becomes equal to or less than the set angle, and as shown in FIG. 4D, the control device instructs the moving device 11 to move forward, the moving pulley 6 approaches the cutting object 2, and the wire saw 3 moves. Safety is ensured so as not to come off the pulley 6. In short, it is only necessary that the sensor 12 can detect the degree of progress of cutting by the wire saw 3.

  When the cutting object 2 is a large number of steel pipes arranged in a grid, the distance between the cutting position of the wire saw 3 and the position of the moving pulley 6 disposed at the position closest to the cutting object 2 is In this cutting method, the object to be cut 2 is cut while moving the moving pulley 6 via the control device and the moving device 11 so as to be within a predetermined range.

  As shown in FIG. 5 (A), the positions of the moving pulleys 6 and 6 arranged on both sides and the positions of the wire saws 3 laid on the steel pipes 2e and 2f at the outermost end position, It is arranged at a desired distance within a distance range in which safety has been confirmed in advance.

  As a result, as shown in FIG. 5B, when the wire saw 3 completes the cutting of the steel pipes 2e and 2f, the position of the wire saw 3 and the position of the moving pulley 6 are a distance β (about 3 to 30 cm). Thus, safety is ensured.

  Thus, when the wire saw 3 is erected on the steel pipe, the transfer device 11 is controlled by the control device so that the distance between the position of the wound wire saw 3 and the position of the moving pulley 6 is within a predetermined range. It is to be moved. Thereby, even if the steel pipe of the cutting object 2 is not arrange | positioned by the fixed space | interval in the front-back direction, continuous cutting | disconnection is possible.

  In addition, the angle of the wire saw 3 with respect to the moving pulley 6 is detected by a sensor so that the distance between the moving pulley 6 and the wire saw 3 wound around the steel pipe is always constant. The apparatus 11 may be moved. Thereby, a continuous cutting operation becomes possible.

It is a notional block diagram of the wire saw apparatus 1 which concerns on this invention. It is explanatory drawing explaining the cutting method by the wire saw apparatus 1 which concerns on the same invention. It is explanatory drawing which shows the relationship of the change of the distance of the moving pulley 6 and the wire saw 3 in the wire saw apparatus 1. FIG. It is explanatory drawing of the cutting method which concerns on 2nd Example in the same invention. It is explanatory drawing of 3rd Example based on the same invention. It is a schematic explanatory drawing which shows the cutting method by the wire saw in a prior art example. It is explanatory drawing (A) which shows a pulley distance, and a relationship curve figure (B) which shows the relationship between the pulley distance and cutting | disconnection time. It is explanatory drawing (A) and (B) which show a mode that a wire saw bounces off at the time of removing with a wire saw from a cutting target, and a wire saw removes from a pulley.

Explanation of symbols

1 Wire saw device,
2 Cutting object (steel pipe),
2a-2f steel pipe,
3 Wire saw,
4 cutting device,
5 Guide pulley,
6 Moving pulley,
7 spindles,
8 Moving rail,
9 Motor,
10 gears,
11 Mobile device,
12 Sensor.

Claims (3)

It is a method of winding a wire saw around a cutting object, guiding it with a guide pulley while applying tension to it, winding it endlessly, circulating it and cutting it,
When the wire pulley is detached from the cutting object after completion of cutting, the wire saw jumps off from the moving pulley. In order to prevent this, it is moved toward the object to be cut and arranged at a position closest to the object to be cut so that the distance between the cutting position of the wire saw and the position of the moving pulley is within a predetermined range. A sensor provided on the movable pulley for measuring the distance or angle of the wire saw, a control device connected to the sensor and instructing to move the movable pulley when the distance or angle is equal to or less than a predetermined distance and angle; A moving device controlled to move the moving pulley according to a command from the control device;
A cutting method using a wire saw. It is a method of winding a wire saw around a cutting object, guiding it with a guide pulley while applying tension to it, winding it endlessly, circulating it and cutting it,
  Via the control device and the moving device, the moving pulley is arranged so that the distance between the cutting position of the wire saw and the position of the moving pulley arranged at the position closest to the object to be cut is within a predetermined range. Cutting the cutting object continuously while moving it,
  A cutting method using a wire saw. A device that wraps a wire saw around a cutting object, guides it with a guide pulley while applying tension to it, winds it endlessly, circulates it and cuts it,
  A sensor for measuring a distance or angle of a wire saw provided on a moving pulley disposed at a position closest to the cutting object;
  A control device connected to the sensor and instructing to move the movable pulley when the distance is less than or equal to a predetermined distance and angle;
  A moving device controlled to move the moving pulley according to a command of the control device;
At least equipped with,
  Wire saw device characterized by.

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