Roller flying shear shearing angle planning and control method

Abstract

The invention provides a shearing angle planning and control method for a roller flying shear. The invention relates to a method for planning the shearing angle of a roller flying shear, which comprises the following steps of: 1, taking a lower roller shaft as a positioning reference shaft, fixing a shear blade on a roller, and rotating around the axis of the roller; and step 2, region division. The invention further relates to a shearing control method of the roller flying shear. According to the method, a shearing area is set based on the shear blade overlapping amount and the spiral angle, synchronous areas are arranged on the two sides with the angle of the shearing area as the benchmark, the angle of a shearing acceleration area and the angle of a deceleration braking area are enlarged, functional area division in the 360-degree range is expanded to 580 degrees through process control, and clear area division is achieved; flying shear starting and braking impact loads are effectively reduced, and boundary information feedback is clear. According to the method for controlling the shearing angle of the roller flying shear, the purposes of improving the dynamic response performance of the flying shear and improving the control precision of the flying shear are finally achieved on the basis of solution of target input and correction in the buffer area.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical equipment technology; in particular, it relates to a method for planning and controlling the shearing angle of a roller flying shear. Background Technology

[0002] In continuous steel plate rolling production lines, flying shears are used to cut moving steel plates. There are many types of flying shears, among which the drum-type flying shear has advantages such as simple structure, small moment of inertia, and small fluctuation in shearing inertia. It can achieve high-speed shearing of strip steel and is particularly suitable for continuous strip rolling production lines.

[0003] The roller flying shear operates on a start-stop system. Upon receiving a work signal, the motor starts, the flying shear accelerates, and the horizontal speed of the shear blades equals the speed of the machine unit, entering the shearing synchronization zone where it cuts the steel plate. After the flying shears completely cuts the steel plate, it enters the deceleration zone, the motor reverses its braking direction, and the shear blades decelerate until they stop, completing one shearing cycle.

[0004] Due to varying production line speeds, a single cutting cycle of a flying shear can range from a few seconds to hundreds of milliseconds. The rapid acceleration and deceleration of the transmission components directly impacts the installed capacity of the transmission system and the cutting quality of the product. Existing roller flying shears suffer from the following shortcomings in their cutting angle design: unreasonable planning, significant starting and braking impacts, and poor precision in blade speed control.

[0005] Based on the shortcomings of the existing technology, there is an urgent need for a technical solution that features a reasonable shearing angle, minimal starting and braking impact, and high precision in controlling the shearing blade speed. Summary of the Invention

[0006] The purpose of this invention is to provide a method for planning and controlling the shearing angle of a roller flying shear.

[0007] The invention is achieved through the following technical solution:

[0008] This invention relates to a method for planning the shearing angle of a roller shear, comprising the following steps:

[0009] Step 1: Using the lower roller shaft as the positioning reference shaft, the shear blade is fixed on the roller and rotates around the roller shaft.

[0010] Step 2, Area Division:

[0011] Establish a coordinate system with the Y-axis pointing upwards as the 0-degree position, and the degrees increasing clockwise, with the 90° position being the shear blade stop and wait position;

[0012] A symmetrical angular region is planned on both sides of the y-axis. This region, which includes the overlap of the shear blades and the helix angle, forms the angle from the entry to the exit of the rotating drum. This region is named the shearing zone.

[0013] An angled region is set to the left of the shearing zone. The angle range of this region is similar to that of the shearing zone. This region is named the pre-cut synchronization zone.

[0014] An angle region is set to the right of the shearing region. The angle range of this region is similar to that of the shearing region. This region is named the post-shearing synchronization region.

[0015] Set a 40° angle area counterclockwise from the stop waiting position (90° angle), and name it the shearing preparation area;

[0016] The starting angle region from the shearing preparation area to the pre-shearing synchronization area is named the startup acceleration area.

[0017] The termination angle of the post-synchronization zone is set to the 270° area, which is named the deceleration and braking zone.

[0018] The area from 270° to 90° is named the zero-position zone.

[0019] Preferably, the angle division of the shearing zone is calculated using the helix angle and overlap of the shear blade as parameters, the shearing angle is enclosed by the shearing zone angle, and there is a certain margin.

[0020] Preferably, a pre-cutting synchronization zone is set at the entrance of the shearing zone. The rotational speed of the shear blade is detected and corrected in the pre-cutting synchronization zone and the shearing zone to meet the set speed advance amount of 2% to 7%, effectively eliminating the influence of speed and tension fluctuations on the shearing quality and improving the shearing accuracy.

[0021] Preferably, the exit of the shearing zone is provided with a post-cutting synchronization zone, in which the rotational speed of the shear blade is detected and corrected to meet the set speed lead amount of 2% to 7%, so as to prevent the shear blade from blocking the lead-in movement.

[0022] Preferably, the present invention provides a shearing preparation zone and a zeroing zone, which increases the acceleration and deceleration angles of the flying shear, thereby reducing the installed power and, under the same installed power, reducing the starting and braking loads of the equipment and improving dynamic stability.

[0023] This invention also relates to a method for controlling the shearing of a roller flying shear, comprising the following steps:

[0024] Step 1: Divide the region using the roller flying shear cutting angle planning method described in claim 1;

[0025] Step 2, Shearing parameter setting: Obtain the machine speed v, steel plate thickness h, and steel plate width B during steel plate cutting. Compare these parameters with the database and determine if they meet the flying shear shear cutting range. If the requirements are met, proceed to shearing parameter recording. If the requirements are not met, issue an alarm and proceed to the special shearing stage.

[0026] Step 3, Shearing Preparation: Track the position of the strip weld. Once the weld position enters the shearing preparation zone, the flying shear is started and reversed to the start-up waiting position. Based on the obtained shearing unit speed v, shear blade radius r, start-up angle ε0, and planned acceleration angular displacement ε1, calculate the angular acceleration α using the following formula:

[0027]

[0028] Step 4, Flying Shear Start-up: The flying shear motor starts, and the acceleration control of the motor is adjusted according to the calculated angular acceleration value. The drum accelerates to the shearing angular velocity ω1, as shown in the following formula:

[0029]

[0030] Step 5, Pre-cutting synchronization zone: The flying shear accelerates to an angular velocity ω1 and enters the pre-cutting synchronization zone. Within the synchronization zone, the drum angular velocity is corrected to satisfy the horizontal component velocity v of the shear blade. x =kv, where k = 1.02 to 1.07;

[0031] Step 6, Shearing Zone: Within the shearing zone, the steel plate is completely cut off, while simultaneously satisfying the horizontal component velocity v of the shear blade. x =kv, where k = 1.02 to 1.07;

[0032] Step 7, Post-cutting synchronization zone: After cutting, according to the horizontal component velocity v of the shear blade... x =kv, where k = 1.02~1.07, and the flying shear rotates through relevant angles according to the angle division of the area;

[0033] Step 8, Deceleration and Braking: After the shear blade leaves the cutting synchronization zone, it enters the deceleration zone. Based on the angular velocity ω2 of the roller entering the deceleration zone and the planned deceleration angular displacement ε2, the angular deceleration α' is calculated using the following formula:

[0034]

[0035] The motor is decelerated according to the calculated angular deceleration value, so that the speed of the drum drops to 0 within the planned angular displacement ε2.

[0036] Step 9, Zero Position: The position where the speed drops to 0 within the planned deceleration angle displacement ε2 is not the stopping position. The flying shear reverses under the action of the motor, and the shear blade rotates to the horizontal 90° position of the angle planning area and stops. The stopping of the shear blade and waiting for the zero position is conducive to the passage of the strip steel, and it is also the zeroing of the phase angle control of the shear blade.

[0037] The present invention has the following advantages:

[0038] (1) The shearing angle planning method of the roller flying shear provided by the present invention is based on the shearing blade overlap and the spiral angle to set the shearing zone, and sets the synchronization zone on both sides with the shearing zone angle as the reference, expands the angle of the shearing acceleration zone and the deceleration and braking zone, and expands the functional area division within the 360° range to 580° through process control, so as to achieve clear area division, effectively reduce the impact load of flying shear starting and braking, and clear boundary information feedback.

[0039] (2) The roller flying shear cutting angle control method provided by the present invention is based on the solution of the target input and the correction in the buffer, which ultimately achieves the purpose of improving the dynamic response performance of the flying shear and improving the control accuracy of the flying shear. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the shearing angle planning of the roller flying shear involved in this invention;

[0041] Figure 2 This is a schematic diagram of the shearing control process of the roller flying shear involved in this invention;

[0042] Figure 3 This is a schematic diagram of the preparation and start-up area of ​​the roller flying shear involved in this invention;

[0043] Figure 4 This is a schematic diagram of the synchronous and shearing zone of the roller flying shear involved in this invention;

[0044] Figure 5 This is a diagram illustrating the deceleration, stopping, and zeroing process of the roller flying shear involved in this invention. Detailed Implementation

[0045] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are merely further illustrations of the present invention, but the scope of protection of the present invention is not limited to the following embodiments.

[0046] Example 1

[0047] This embodiment relates to a method for planning the shearing angle of a roller flying shear, such as... Figure 1 As shown:

[0048] Step 1: Using the lower roller shaft as the positioning reference shaft, the shear blade is fixed on the roller and rotates around the roller shaft.

[0049] Step 2: Establish a coordinate system with the Y-axis pointing upwards as the 0-degree position, and the degrees increasing clockwise, with the 90° position being the shear blade stopping and waiting position;

[0050] The area from the 90° stop waiting position to the angle θ1 position is the shearing preparation zone. This area is 40°. At the angle θ1 position, the flying shear obtains parameters such as angular acceleration and angular velocity after acceleration.

[0051] The area from angle θ1 to θ2 is the shear blade start-up acceleration zone, which is about 290°. In this area, the roller is accelerated to the set angular velocity.

[0052] The region from angle θ2 to θ3 is the pre-cutting synchronization zone, which is about 10°. In this region, the horizontal component velocity of the shear blade is corrected to meet a certain speed lead.

[0053] The region from angle θ3 to θ4 is the shearing zone, which is approximately 10°, and the strip is completely cut in this region.

[0054] The area from angle θ4 to θ5 is the post-cutting synchronization zone, which is about 10°. In this zone, the horizontal component speed of the shear blade is ensured to have a certain speed lead relative to the speed of the unit to avoid obstructing the lead-in operation.

[0055] The area from angle θ5 to 270° is the deceleration and braking zone, which is about 250°. In this zone, the flying shear is decelerated until it stops.

[0056] The area from 270° to 90° is the zeroing zone, which is approximately 180°. The drum reverses to the 90° horizontal position and stops to wait for the next shearing cycle.

[0057] Example 2

[0058] This embodiment relates to a method for controlling the shearing of a roller flying shear, such as... Figure 2 As shown, after first using the area division involved in Example 1, the following steps are also included:

[0059] Step 1, setting shearing parameters: Obtain the machine speed v, steel plate thickness h, and steel plate width B when cutting the steel plate. Compare the parameters with the database to determine whether they meet the shearing range of the flying shear. If they meet the requirements, enter the shearing parameter recording. If they do not meet the requirements, issue an alarm and enter the special shearing stage.

[0060] Step 2, Shearing Preparation: Track the position of the strip weld. Once the weld position enters the shearing preparation zone, the flying shear is started and reversed to the start-up waiting position. Calculate the angular acceleration α based on the obtained shear unit speed v, shear blade radius r, starting angular displacement ε0, and planned acceleration angular displacement ε1, using the following formula:

[0061]

[0062] Step 3, Flying Shear Start-up: The flying shear motor starts, and the acceleration control of the motor is adjusted according to the calculated angular acceleration value. The drum accelerates to the shearing angular velocity ω1, as shown in the following formula:

[0063]

[0064] Step 4, Pre-cutting synchronization zone: The flying shear accelerates to an angular velocity ω1 and enters the pre-cutting synchronization zone. Within the synchronization zone, the drum angular velocity is corrected to satisfy the horizontal component velocity v of the shear blade. x =kv, where k = 1.02~1.07, the horizontal component velocity of the shear blade has a certain lead over the strip steel;

[0065] Step 5, Shearing Zone: The flying shear has a spiral blade structure with a certain overlap between the upper and lower blades. From the moment the blades enter the shearing zone to the moment they exit, the roller rotates at a certain angle; this angle is the shearing zone. Within the shearing zone, the horizontal component of the blade velocity v... x =kv, the horizontal component of the shear blade has a certain lead over the strip steel. This design can eliminate the fluctuation of strip steel tension and speed, and improve the quality of the sheared section.

[0066] Step 6, Post-cut Synchronization Zone: After shearing, there is some spatial interference between the upper and lower shear blades and the belt head. To facilitate the forward conveying of the belt head, the horizontal component velocity v of the shear blades in this zone is adjusted. x =kv, the shear blade will no longer obstruct the leading motion after rotating through a certain angle;

[0067] Step 7, Deceleration and Braking: After the shear blade leaves the cutting synchronization zone, it enters the deceleration zone. Based on the angular velocity ω2 of the roller entering the deceleration zone and the planned deceleration angular displacement ε2, the angular deceleration α' is calculated. The motor is decelerated according to the calculated angular deceleration value, so that the speed of the drum drops to 0 within the planned angular displacement ε2.

[0068] Step 8, Zero Position: The position where the speed drops to 0 within the planned angular displacement ε2 is not the stopping position. The flying shear reverses under the action of the motor, and the shear blade rotates to a horizontal 90° position within the angle planning area before stopping. The stopping of the shear blade to wait for the zero position is beneficial for the passage of the strip steel and also serves to zero the phase angle control of the shear blade.

[0069] Example 3

[0070] To further illustrate the invention, this embodiment uses a set of parameters: shear blade helix angle 0.72°, overlap 0.75mm, blade radius 235mm, shear blade length 2000mm, and shearing unit speed 220m / min, to explain the division and control of the shearing angle of the drum flying shear. The process is as follows:

[0071] like Figure 3 As shown, the left (1) figure shows the flying shear in the stop waiting position, with the shear blade stopped at 90°; upon receiving the shearing preparation signal, the shear blade rotates 40° counterclockwise to the position shown in the middle (2) figure, and the electrical control parameter angular acceleration α = 27.2 rad / s is obtained. 2Waiting to start; upon receiving the start signal, the flying shear starts according to the calculated angular acceleration α, and the shear blade rotates 290° clockwise to the position in view (3). In this angular region, the flying shear accelerates to the set angular velocity ω1=16.6rad / s.

[0072] like Figure 4 As shown, the middle (5) figure is the shearing zone, the shear blade helix angle is 0.72°, the overlap is 0.75mm, the calculated shearing angle is 9.2°, and the planned 10° area on both sides of the y-axis is the shearing zone, where the steel plate is completely cut off. The 10° area on the left side of the shearing zone is the pre-cutting synchronous zone, as shown in the left (4) figure. In this zone, the shear blade speed is detected and corrected to ensure that the horizontal blade edge is equal to 224.4~231m / min. The 10° area on the right side of the shearing zone is the post-cutting synchronous zone, as shown in the right (6) figure. In this zone, the shear blade speed is detected and corrected to ensure that the horizontal blade edge is equal to 224.4~231m / min, which does not affect the forward conveying of the steel plate.

[0073] like Figure 5 As shown, the shear blade leaves the post-cutting synchronization zone and enters the deceleration and braking zone with an angular deceleration of α = 31.6 rad / s. 2 Decelerate, slowing down to a stop within 250°, as shown in the left (7) diagram. Rotate the shear blade counterclockwise, stopping at 90°, completing the zeroing process, as shown in the middle (8) diagram. Figures 3-5 In the process, (1) to (8) constitute a complete shearing process. The flying shear is used in accordance with the above descriptive cycle.

[0074] The shearing angle planning method for a rotary flying shear provided by this invention sets the shearing zone based on the shear blade overlap and helix angle. A synchronization zone is set on both sides based on the shearing zone angle, and the angles of the shearing acceleration and deceleration / braking zones are expanded. The functional area division within a 360° range is extended to 580° through process control, achieving clear area division and effectively reducing the impact load during flying shear startup and braking, with clear boundary information feedback. The shearing angle control method for a rotary flying shear provided by this invention is based on solving for the target input and making corrections within the buffer zone, ultimately improving the dynamic response performance and control accuracy of the flying shear.

[0075] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A method for planning the shearing angle of a roller flying shear, characterized in that, Includes the following steps: Step 1: Using the lower roller shaft as the positioning reference shaft, the shear blade is fixed on the roller and rotates around the roller shaft. Step 2, Area Division: Establish a coordinate system with the Y-axis pointing upwards as the 0-degree position, and the degrees increasing clockwise, with the 90° position being the shear blade stop and wait position; A symmetrical angular region is planned on both sides of the y-axis, named the shearing zone; this region encloses the overlap of the shear blades and the helix angle to form the angle of rotation of the cutting roller from entry to exit. Set an angular region on the left side of the shearing zone, and name it the pre-cut synchronization zone; Set an angular region to the right of the shearing region, and name it the post-shearing synchronization region; A 40° angled area is set counterclockwise from the stop waiting position and named the shearing preparation area; the angle of the stop waiting position is 90°. The starting angle region from the shearing preparation area to the pre-shearing synchronization area is named the startup acceleration area. The termination angle of the post-synchronization zone is set to the 270° area, which is named the deceleration and braking zone. The area from 270° to 90° is named the zero-position zone.

2. The method for planning the shearing angle of a roller flying shear as described in claim 1, characterized in that, The angle division of the shearing zone is calculated using the helix angle and overlap of the shear blade as parameters. The shearing angle is enclosed by the shearing zone angle and has a certain margin.

3. The method for planning the shearing angle of a roller flying shear as described in claim 1, characterized in that, The entrance to the shearing zone is equipped with a pre-cutting synchronization zone. The rotational speed of the shear blade is detected and corrected within the pre-cutting synchronization zone and the shearing zone to meet the set speed lead amount of 2% to 7%.

4. The method for planning the shearing angle of a roller flying shear as described in claim 1, characterized in that, The exit of the shearing zone is equipped with a post-cutting synchronization zone, in which the rotational speed of the shear blade is detected and corrected to meet the set speed lead amount of 2% to 7%.

5. A method for controlling the shearing of a roller flying shear, characterized in that, Includes the following steps: Step 1: Divide the region using the roller flying shear cutting angle planning method described in claim 1; Step 2, Shearing parameter setting: Obtain the machine speed v, steel plate thickness h, and steel plate width B during steel plate cutting. Compare these parameters with the database and determine if they meet the flying shear shear cutting range. If the requirements are met, proceed to shearing parameter recording. If the requirements are not met, issue an alarm and proceed to the special shearing stage. Step 3, Shearing Preparation: Track the position of the strip weld. Once the weld position enters the shearing preparation zone, the flying shear is started and reversed to the start-up waiting position. Based on the obtained shearing unit speed v, shear blade radius r, start-up angle ε0, and planned acceleration angular displacement ε1, calculate the angular acceleration α using the following formula: Step 4, Flying Shear Start-up: The flying shear motor starts, and the acceleration control of the motor is adjusted according to the calculated angular acceleration value. The drum accelerates to the shearing angular velocity ω1, as shown in the following formula: Step 5, Pre-cutting synchronization zone: The flying shear accelerates to an angular velocity ω1 and enters the pre-cutting synchronization zone. Within the synchronization zone, the drum angular velocity is corrected to satisfy the horizontal component velocity v of the shear blade. x =kv, where k = 1.02 to 1.07; Step 6, Shearing Zone: Within the shearing zone, the steel plate is completely cut off, while simultaneously satisfying the horizontal component velocity v of the shear blade. x =kv, where k = 1.02 to 1.07; Step 7, Post-cutting synchronization zone: After cutting, according to the horizontal component velocity v of the shear blade... x =kv, where k = 1.02~1.07, and the flying shear rotates through relevant angles according to the angle division of the area; Step 8, Deceleration and Braking: After the shear blade leaves the cutting synchronization zone, it enters the deceleration zone. Based on the angular velocity ω2 of the roller entering the deceleration zone and the planned deceleration angular displacement ε2, the angular deceleration α' is calculated using the following formula: The motor is decelerated according to the calculated angular deceleration value, so that the speed of the drum drops to 0 within the planned angular displacement ε2. Step 9, Zero position: Stop the machine when the shear blade rotates to 90° horizontally within the angle planning area.

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