JP5892126B2 - Shear speed setting device, rolling cut shear, shear speed setting method, and steel plate shearing method - Google Patents

Description

  The present invention relates to a shear speed setting device for setting a shear speed of a rolling cut shear, a rolling cut shear provided with the shear speed setting device, a shear speed setting method, and a shear speed of a rolling cut shear by the shear speed setting method. The present invention relates to a method for shearing steel sheets.

  As a shearing equipment for shearing a steel plate in the longitudinal direction and performing product drawing, a rolling cut type shearing equipment including a rolling cut type shear (rolling cut shear) and a transfer table is known. A rolling cut shear is a mechanism in which a crank that suspends an upper blade circulates on a predetermined moving circle, and the upper blade is swung in a vertical plane above the lower blade to shear the steel plate, and the crank moves. For each cycle of the shear that circulates once on the circumference, the steel sheet is repeatedly sheared during the contact between the upper blade and the steel sheet, and the steel sheet is conveyed on the lower blade during the non-contact state. She is shearing.

  As a technique for improving the shearing efficiency of such a rolling cut shear, for example, the technique of Patent Document 1 is known. That is, in Patent Literature 1, while the shearing blade is in contact with the plate (during steel plate shearing), the shearing blade speed is higher than the steady operation speed, while the shearing blade is not in contact with the plate (during steel plate conveyance). Has made the shearing blade speed lower than the steady operation speed to reduce the duty of the transfer machine and improve the production capacity.

JP 62-120907 A

  In the recent thick plate order, the thickness of the steel plate is increasing. Here, when a steel plate having a large thickness is sheared, the movement angle on the moving circle of the crank from when the upper blade and the steel plate come into contact with each other becomes non-contact increases. On the other hand, there is an upper limit to the steel plate carrying capacity of the carrying table. For this reason, when the rotation speed of the crank (shear speed) is a constant speed, the time during steel plate shearing (steel plate shearing time) becomes longer, and the steel plate transport time may not be able to be accommodated within one shear cycle time. .

  By the way, if the technique of Patent Document 1 is applied, it is possible to lengthen the steel plate conveyance time while maintaining the shear 1 cycle time. However, the technique of Patent Document 1 is only for ensuring a long steel sheet conveyance time, and does not take into account fluctuations in the crank movement angle in accordance with the plate thickness. For this reason, even if patent document 1 was applied, there existed a problem that the steel plate conveyance time was not necessarily able to be contained in 1 shear cycle depending on the plate thickness of the steel plate to be sheared. In addition, when changing the shear speed, the shear speed is accelerating / decelerating before and after the change, but since the time during this period is not taken into consideration, the time during which the upper blade and the steel plate are not in contact cannot be properly grasped. There was a case.

  The present invention has been made in view of the above, and is a shear speed setting device, a rolling cut shear, and a shear speed setting method capable of reliably securing a steel sheet conveying time without reducing the shearing efficiency of the rolling cut shear. And a method of shearing a steel sheet.

  In order to solve the above-described problems and achieve the object, a shear speed setting device according to the present invention includes a linear lower blade, a curved upper blade, and a crank that holds the upper blade, A shear speed that sets a shear speed of a rolling cut shear in which a crank circulates on a predetermined moving circle and the upper blade swings in a vertical plane above the lower blade along the rotation to shear the steel plate. The setting device, wherein the rolling cut shear shears the steel plate during contact between the upper blade and the steel plate while the crank makes one turn on the moving circle, and the steel plate during non-contact. The crank is continuously sheared, and the movement of the crank on the moving circumference from the time when the upper blade comes into contact with the steel plate based on the thickness of the steel plate until no contact is made. A specifying means for specifying an angle; and the specified moving angle; Based on the steel plate transport time required for transporting the steel plate and the acceleration / deceleration rate of the shear speed, the shear during shearing of the steel plate in which the steel plate transport time falls within a specified time that is defined in advance as the time for one round. Setting means for setting the speed and the shear speed during conveyance of the steel sheet.

  A rolling cut shear according to the present invention includes the shear speed setting device according to the present invention.

  The shear speed setting method according to the present invention includes a linear lower blade, a curved upper blade, and a crank that suspends the upper blade, and the crank circulates on a predetermined moving circumference. , A shear speed setting method for setting a shear speed of a rolling cut shear that shears a steel sheet by swinging the upper blade in a vertical plane above the lower blade with the rotation, wherein the rolling cut shear is The steel plate is sheared during contact between the upper blade and the steel plate while the crank rotates once on the moving circle, and the steel plate is conveyed during non-contact to continuously shear the steel plate. Performing a step of specifying a movement angle on the moving circumference of the crank from the time when the upper blade comes into contact with the steel plate based on the plate thickness of the steel plate until it becomes non-contact, and the specified movement Angle and steel plate transport time required to transport the steel plate Based on the acceleration / deceleration rate of the shear speed, the shear speed during shearing of the steel sheet and the shear speed during transport of the steel sheet are set such that the steel sheet transport time falls within a predetermined time defined as the time for the one round. And a step of performing.

  The steel plate shearing method according to the present invention includes a step of setting a shear speed of a rolling cut shear by the shear speed setting method according to the present invention.

  According to the present invention, it is possible to reliably secure the time for transporting the steel sheet without reducing the shearing efficiency of the rolling cut shear.

FIG. 1 is a schematic diagram showing a rolling cut shear. FIG. 2 is a diagram illustrating the flow of one shearing operation of the rolling cut shear. FIG. 3A is a diagram illustrating an example of the plate contact angle and the plate removal angle of the upper blade when shearing a general strength material on the moving circumference. 3-2 is a figure which shows the numerical example of the board contact angle and board omission angle of the upper blade of FIGS. FIG. 4-1 is a diagram illustrating an example of the plate contact angle and the plate removal angle of the upper blade when shearing a high-strength material on the moving circumference. 4-2 is a figure which shows the numerical example of the board contact angle and board omission angle of the upper blade of FIG. 4-1. FIG. 5 is a diagram illustrating an example of a shear speed and a steel sheet conveying speed in one shear cycle when shearing a conventional thick plate material. FIG. 6 is a diagram illustrating an example of a shear speed and a steel sheet conveyance speed in one shear cycle when shearing a thick material. FIG. 7 is a diagram illustrating another example of the shear speed and the steel sheet transport speed in one shear cycle when shearing a thick-walled material. FIG. 8 is a diagram showing another example of the shear speed and the steel plate conveyance speed in one shear cycle when shearing a thick material. FIG. 9 is a block diagram illustrating a configuration example of the shear speed setting device. FIG. 10 is a diagram illustrating a shear speed setting process performed by the shear speed setting device. FIG. 11 is a flowchart illustrating a processing procedure of the shear speed setting process.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out a shear speed setting device, a rolling cut shear, a shear speed setting method, and a steel plate shearing method according to the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. Moreover, in description of drawing, the same code | symbol is attached | subjected and shown to the same part.

  FIG. 1 is a schematic diagram showing a rolling cut shear 1 of a rolling cut type shearing equipment to which a shear speed setting device 5 (see FIG. 9) of the present embodiment is applied. FIG. 2 is a diagram for explaining the flow of one shearing operation of the rolling cut shear 1.

  A rolling cut shear 1 shown in FIG. 1 is indicated by an arrow Z1 in FIG. 1 by a conveying table 3 when a curved upper blade 13 swings above a linear lower blade 11 fixed to a housing or the like. The steel sheet S to be sheared conveyed from the right entry side to the left exit side is sheared along its longitudinal direction.

  In the rolling cut shear 1, the upper blade 13 is attached to and suspended from one end of a pair of left and right cranks 15, 15. The upper blade 13 is supported by a housing or the like at both ends in the longitudinal direction via regulating members 17, 17, and the regulating member 17, 17 causes the upper blade 13 to swing vertically above the upper blade 13. Regulated in the plane.

  On the other hand, a main drive gear 21 is connected to the drive shaft of a drive motor 19 disposed above the cranks 15, 15. In the outer peripheral portions of the side surfaces of the left and right driven gears 23, 23 meshing with the main drive gear 21, The other ends of the corresponding cranks 15 and 15 are rotatably connected. The other ends of the cranks 15 and 15 circulate on the moving circumference Y1 by rotating along the moving circumference Y1 indicated by a one-dot chain line in FIG. 1 along with the rotation of the driven gears 23 and 23. .

  In the rolling cut shear 1 having the above-described configuration, for example, the driving gear 21 is rotated clockwise in FIG. 1 by driving the drive motor 19, and the driven gears 23 and 23 are rotated counterclockwise in FIG. Rotate to. Then, the rotational force of the driven gears 23 and 23 is transmitted through the cranks 15 and 15 as a force for swinging the upper blade 13. More specifically, the initial positions are individually set in advance at the other end portions of the respective cranks 15 and 15, and the rolling cut shear 1 has the starting points of the other end portions of the respective cranks 15 and 15 as respective initial positions. A single shearing operation shown in FIG. 2 is performed by rotating once on the moving circumference Y1 and swinging the upper blade 13.

  That is, as shown in FIG. 2A, the upper blade 13 in the initial state in which each of the other end portions of the cranks 15 and 15 is positioned at the initial position moves away from the lower blade 11 and retreats upward. Although not shown in FIG. 2, the height of the upper blade 13 at this time is a height that does not contact the steel plate S to be sheared conveyed by the conveying table 3.

  Then, when the upper blade 13 gradually moves down to the predetermined angle (the plate contact angle of the upper blade 13) in the process in which each crank 15, 15 makes one turn on the moving circumference Y1 from the initial state described above. It contacts the steel plate S and then contacts the lower blade 11 (FIG. 2B). Thereby, the shearing of the steel plate S is started. As the cranks 15, 15 continue to move, the left end of the upper blade 13 rises, while the right end gradually descends and approaches the lower blade 11 (FIG. 2 (c) → FIG. 2 (d)). During this time, the contact position between the upper blade 13 and the steel sheet S moves from the left end side to the right end side of the upper blade 13 as needed.

  Eventually, the right end of the upper blade 13 comes into contact with the lower blade 11 (FIG. 2 (e)), and then the right end rises and the other ends of the cranks 15 and 15 are at a predetermined angle (the plate removal angle of the upper blade 13). ), The upper blade 13 and the steel sheet S are brought into a non-contact state, and the initial state shown in FIG.

  Here, as described above, the rolling cut shear 1 is in contact with the upper blade 13 and the steel plate S (steel plate shearing) while the cranks 15 and 15 rotate once on the moving circle Y1 (shear one cycle). The steel plate S is sheared in the middle), and the steel plate S is conveyed during non-contact. In other words, the rolling cut shear 1 realizes continuous shearing of the steel sheet S by repeating shearing and conveying of the steel sheet S every cycle of the shear.

By the way, the larger the plate thickness of the steel plate, the higher the proportion of steel plate shearing in one shear cycle. FIG. 3A shows a plate contact angle X of the upper blade 13 when shearing steel plates of general strength (hereinafter referred to as “general strength materials”) S11 to S16 mainly targeted for shearing in the conventional operation. _I11 to X _I16 and a diagram showing on the moving circumferential Y1 an example of a plate missing angle X _O11 to X _O16, plate contact angle of the upper blade 13 in FIG. 3-2 X _I11 to X _I16 and leaf spots angle X _O11 The numerical value of _-XO16 is illustrated. On the other hand, FIG. 4-1 shows a case where steel plates (hereinafter referred to as “high-strength materials”) S21 to S26 having higher strength than general strength materials are sheared using a blade whose shape has been changed for high-strength materials. FIG. 4 is a diagram showing an example of the plate contact angles X _{I21 to} X _I26 and the plate _removal angles X _{O21 to} X _O26 of the upper blade 13 on the moving circumference Y1, and in FIG. 4B, the plate contact angles X _I21 to X _I21 of the upper blade 13 The numerical values of X _I26 and the plate _removal angles X _{O21 to} X _O26 are illustrated.

  As shown in FIGS. 3-1, 2 and 4-1, the thicker the steel plate, the greater the movement of the crank 15, 15 from the plate contact angle of the upper blade 13 to the plate removal angle on the circumference Y1. The moving angle is large. Therefore, on the assumption that the revolving speed (shear speed) of the cranks 15 and 15 is constant, the steel plate shearing time becomes longer when the plate thickness is thick. As described above, when shearing a steel plate having a large thickness, the same shear as that used when shearing a steel plate having a moderate thickness or less (hereinafter referred to as a conventional plate thickness material), which was mainly subjected to shearing in conventional operations, is used. The time required for transporting the steel plate (steel plate cycle time) is defined as the time required for one cycle (the time required for the cranks 15, 15 to make one turn on the moving circumference Y1). There may be a situation where the transport time cannot be secured.

  FIG. 5 is a diagram illustrating an example of a shear speed and a steel sheet conveying speed in one shear cycle when shearing a conventional thick plate material. FIGS. 6 to 8 show examples of shear speed and steel plate conveyance speed in one shear cycle when shearing a steel plate (hereinafter referred to as “thick material”) that is thicker than a conventional plate thickness material. FIG.

  For example, it is assumed that the shear 1 cycle time is 2 [sec], the shear speed is 30 [rpm], and the steel plate conveyance speed is 2 [m / sec]. Here, the plate contact angle and the plate removal angle of the upper blade 13 can be determined by the plate thickness, and the steel plate shearing time is determined from the plate contact angle and plate removal angle of the upper blade 13 and the shear speed. And steel plate conveyance time turns into time which deducted steel plate shear time from shear 1 cycle time.

  In the case of the conventional thick plate shown in FIG. 5, the steel plate can be sheared and conveyed within one cycle time of the shear. On the other hand, in the case of the thick material shown in FIG. 6, since the steel plate shearing time is long, it partially wraps with the steel plate shearing time as shown by a one-dot chain line in FIG. That is, in this case, the steel plate conveyance time cannot be ensured with a shear cycle of 2 [sec], and if the rolling cut shear 1 is operated as it is, shearing starts during the conveyance of the steel plate, resulting in equipment damage.

  By the way, the rolling cut shear 1 is required to operate without continuously stopping the cranks 15 and 15 by rotating the cranks 15 and 15, but the shear 1 cycle time is a thin-walled material even in the case of a thick-walled material. In this case, it is desired to maintain the shear 1 cycle time. In addition, the steel plate conveyance speed is generally set to the maximum speed in order to secure the steel plate shearing time, and the steel plate conveyance speed employed in the conventional thick plate material illustrated in FIGS. 5 and 6. It is often difficult to accelerate more than this.

  For this reason, for example, as shown in FIG. 7, the steel plate conveyance time can be ensured by increasing the shear 1 cycle time and appropriately reducing the shear speed during the steel plate conveyance. According to this, the problem of equipment breakage is solved, but the shear efficiency is lowered because the shear cycle time is lengthened.

  On the other hand, as shown in FIG. 8, if the shear speed during shearing of the steel sheet is increased to shorten the shearing time of the steel sheet, and in addition, the shearing speed during transport of the steel sheet is decreased, the shear cycle time does not have to be increased. Also, the steel plate conveyance time can be secured. Therefore, the shear speed setting device 5 of the present embodiment calculates the optimum shear speed during shearing and transporting the steel sheet for shearing and transporting the steel sheet while maintaining the shear 1 cycle time at the conventional specified time. .

  FIG. 9 is a block diagram illustrating a configuration example of the shear speed setting device 5 according to the present embodiment. The shear speed setting device 5 is realized using, for example, a general-purpose computer such as a workstation or a personal computer, and performs a process (shear speed setting process) for setting the shear speed. As illustrated in FIG. 9, the shear speed setting device 5 includes an input unit 51, an output unit 53, a recording unit 55, and a processing unit 57 as main functional units.

  The input unit 51 is realized by an input device such as a keyboard, a mouse, a touch panel, and various switches, and outputs an input signal corresponding to an operation input to the processing unit 57. The output unit 53 is realized by a display device such as an LCD, an EL display, or a CRT display, and displays various screens based on a display signal input from the processing unit 57. The output unit 53 may appropriately include an output device such as a printer or a speaker.

  The recording unit 55 is realized by an update recordable flash memory, a built-in or data recording terminal connected hard disk, an information recording medium such as a memory card, and a read / write device thereof. Can be used. In the recording unit 55, a program for operating the shear speed setting device 5 and realizing various functions provided in the shear speed setting device 5, data used during execution of the program, and the like are stored in advance. Or, it is temporarily saved for each processing.

  The processing unit 57 is realized by a CPU or the like, and based on an input signal input from the input unit 51, a program or data stored in the recording unit 55, instructions and data of each unit constituting the shear speed setting device 5 are stored. The operation of the shear speed setting device 5 is controlled by performing transfer or the like. The processing unit 57 includes a shearing movement angle specifying unit 571 as specifying means and a shear speed optimization processing unit 573 as setting means.

FIG. 10 is a diagram for explaining shear speed setting processing performed by the shear speed setting device 5, and shows the plate contact angle X _I and the plate removal angle X _O of the upper blade 13 on the moving circumference Y 1 of the cranks 15, 15. ing.

First, one shear cycle is represented by movement angles A, B, and C on the movement circumference Y1 of the cranks 15 and 15. The movement angle A is a movement angle (movement angle during steel plate shearing) from the plate contact angle X _I of the upper blade 13 to the plate removal angle X _O determined by the plate thickness of the steel plate to be sheared as described above. On the other hand, the total angle of the movement angles B and C is the movement angle when the upper blade 13 and the steel plate are not in contact with each other.

  Here, in the present embodiment, since the shear speed is appropriately set variable during the steel plate shearing and during the steel plate conveyance, the shear speed is accelerated and decelerated before and after the steel plate shearing. The movement angle C is the movement angle (movement angle during speed acceleration / deceleration) of the cranks 15 and 15 that move during the acceleration / deceleration. The movement angle B is a movement angle (movement angle during steel plate conveyance) in which the cranks 15 and 15 move while the shear speed is the shear speed during steel plate conveyance.

In FIG. 5 and the like, the time obtained by subtracting the steel plate shear time from the shear 1 cycle time is defined as the steel plate transport time. In this shear speed setting process, the shear speed acceleration / deceleration is performed twice between the steel plate shear time and the steel plate transport time. Consider the time (speed acceleration / deceleration time). That is, in the shear speed setting process, using the following equations (1) to (4) using the movement angles A, B, and C described above, the steel plate conveyance time is within the prescribed shear one cycle time, and the steel plate shear time is The shear speed during shearing of the steel sheet and during the transportation of the steel sheet is optimized so that the total value of the steel sheet transport time and the speed acceleration / deceleration time is as close as possible to the same or less than the specified shear 1 cycle time. At this time, regarding the steel plate conveyance time, a minimum necessary time for conveying the steel plate is determined in advance and used.

In the above formula (1) ~ (4), V D represents the shear speed in the steel sheet shearing [° / sec], V _T represents the shear rate in the steel sheet conveyance [° / sec], T ₁ steel plate shear Time [sec] is represented, and T ₂ represents a steel sheet conveyance time [sec]. Α represents the shear acceleration / deceleration rate [° / sec ² ], which is a constant set in advance. T ₀ represents the shear 1 cycle time [sec].

For example, first, when the above formulas (1) to (4) are used and the shear speeds V _D and V _T are set to the shear speed of the conventional plate thickness material (for example, 30 [rpm] shown in FIG. 5). It is determined whether or not the above equation (4) is satisfied. When not satisfied, i.e., if the shear cycle time T ₀ which is obtained by the formula (4) exceeds a specified time, while a value obtained by a predetermined speed accelerating the shear velocity V _D in the steel sheet shearing, the steel sheet conveyance Shah speed V _T in after having a predetermined speed reduction value to determine whether it satisfies again the equation (4). The optimum shear speeds V _D and V _T during the steel plate shearing and during the steel plate conveyance are set by repeating this until it is determined that it is satisfied.

  FIG. 11 is a flowchart showing a processing procedure of shear speed setting processing performed by the shear speed setting device 5. The shear speed setting device 5 performs the shear speed setting method by performing processing according to the processing procedure of FIG. The process described here can be realized by storing a program for realizing the shear speed setting process in the recording unit 55, and reading and executing the program by the processing unit 57.

  As shown in FIG. 11, in the shear speed setting process, the processing unit 57 first acquires the plate thickness of the steel plate to be sheared (step S1). The processing here may be performed by accepting an input operation by the operator via the input unit 51, or the thickness of the steel plate to be sheared by the rolling cut shear 1 is stored in the recording unit 55 in advance. It is also possible to read this.

  Subsequently, the moving angle specifying unit 571 during shearing specifies the moving angle during shearing of the cranks 15 and 15 according to the plate thickness of the steel plate acquired in step S1 (step S3). The processing here can be realized by preliminarily defining a correspondence relationship between the plate thickness, the plate contact angle of the upper blade 13 and the plate removal angle, storing it in the recording unit 55, and referring to this.

  Subsequently, the shear speed optimization processing unit 573 uses the above formulas (1) to (4) so that the steel plate conveyance time is within the prescribed shear one cycle time, and the optimum shear during steel plate shearing and during steel plate conveyance is used. A speed is set (step S5).

  The shear speed during shearing of the steel sheet and the shear speed during conveyance of the steel sheet set as described above are used for drive control of the drive motor 19 when the steel sheet that is actually applicable is to be sheared in the rolling cut shear 1.

  As described above, according to the present embodiment, even when the thickness of the steel plate to be sheared is large, the shear speed during steel plate shearing is accelerated while the shear speed during steel plate conveyance is reduced. By performing the above, it is possible to optimize the shear speed during shearing of the steel sheet and during the transportation of the steel sheet so that the steel sheet transportation time is within the prescribed shear 1 cycle time. In addition, since the time during which the shear speed is during acceleration / deceleration can be taken into account before and after changing the shear speed during steel plate shearing and during steel plate conveyance, the time during which the upper blade 13 and the steel plate are not in contact with each other is appropriately set. I can grasp. Therefore, it is possible to ensure the steel plate shear time without increasing the shear cycle time. According to this, it is not necessary to lengthen the shear 1 cycle time in order to secure the steel sheet conveyance time, and the shearing efficiency of the rolling cut shear 1 can be maintained.

  In the above-described embodiment, the case has been described in which the shear speed during shearing and transporting the steel plate is optimized so that the shear 1 cycle time approaches the specified time as much as possible. However, the shear 1 cycle time is less than the specified time. The shear speed during steel plate shearing and during steel plate conveyance may be set so as to be. According to this, a shear speed that can shorten the shear 1 cycle time to the maximum can be set, and the shearing efficiency of the rolling cut shear 1 can be maximized. Further, the steel plate conveyance time may be set longer than the minimum required time, and the shear speed during the steel plate shearing and during the steel plate conveyance may be set. According to this, it is possible to operate the rolling cut shear 1 with a sufficiently long steel plate conveyance time.

DESCRIPTION OF SYMBOLS 1 Rolling cut shear 11 Lower blade 13 Upper blade 15 Crank 3 Conveyance table 5 Shear speed setting device 51 Input part 53 Output part 55 Recording part 57 Processing part 571 Shear speed optimization processing part 573 Shear speed optimization processing part S Steel plate Z1 Conveyance Direction Y1 Movement circumference

Claims (4)

A linear lower blade, a curved upper blade, and a crank that suspends the upper blade, and the crank circulates on a predetermined moving circumference, and the upper blade moves along the circumference with the lower blade. A shear speed setting device for setting a shear speed of a rolling cut shear that shears a steel sheet by swinging in a vertical plane above the blade,
The rolling cut shear shears the steel plate during contact between the upper blade and the steel plate while the crank makes one turn on the moving circle, and conveys the steel plate during non-contact, continuously The steel plate is sheared,
A specifying means for specifying a moving angle on the moving circumference of the crank from when the upper blade comes into contact with the steel plate based on the thickness of the steel plate until it becomes non-contact;
Based on the specified moving angle, the steel plate transport time required for transporting the steel plate, and the acceleration / deceleration rate of the shear speed, the steel plate transport time within a specified time that is defined in advance as the time for one round. Setting means for setting the shear speed during shearing of the steel sheet and the shear speed during steel sheet conveyance,
A shear speed setting device comprising:   A rolling cut shear comprising the shear speed setting device according to claim 1. A linear lower blade, a curved upper blade, and a crank that suspends the upper blade, and the crank circulates on a predetermined moving circumference, and the upper blade moves along the circumference with the lower blade. A shear speed setting method for setting a shear speed of a rolling cut shear that shears a steel sheet by swinging in a vertical plane above the blade,
The rolling cut shear shears the steel plate during contact between the upper blade and the steel plate while the crank makes one turn on the moving circle, and conveys the steel plate during non-contact, continuously The steel plate is sheared,
Specifying the movement angle on the moving circumference of the crank from the time when the upper blade comes into contact with the steel sheet based on the thickness of the steel sheet until it becomes non-contact;
Based on the specified moving angle, the steel plate transport time required for transporting the steel plate, and the acceleration / deceleration rate of the shear speed, the steel plate transport time within a specified time that is defined in advance as the time for one round. Setting the shear speed during shearing of the steel sheet and the shear speed during steel sheet conveyance,
A shear speed setting method comprising:   A shearing method for a steel sheet, comprising the step of setting a shearing speed of a rolling cut shear by the shearing speed setting method according to claim 3.

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