A high speed trimming and scrap method and application for 0.15-0.55 mm non-oriented silicon steel

Abstract

The present application belongs to the technical field of metal plate and strip finishing, and particularly relates to a high-speed trimming and edge cutting method for 0.15-0.55 mm non-oriented silicon steel and application. The method comprises: constant tension centering of the strip into the shear; setting the disc shear line speed according to the thickness and running speed of the strip: 1.02 times the strip speed for thickness ≥ 0.35 mm; 1.04 times the strip speed for thickness < 0.35 mm and strip speed ≤ 30 m / min, and 1.02 times the strip speed for strip speed > 30 m / min; setting the edge cutting shear line speed according to the strip speed: 1.08 times the strip speed for strip speed < 400 m / min, and 1.17 times the strip speed for strip speed ≥ 400 m / min; keeping the edge cutting shear running at a low speed of 20 m / min during temporary stop; forming a constant micro-tension by the speed difference between the disc shear and the edge cutting shear to realize self-stabilization of the scrap edge; and naturally falling and non-negative pressure waste discharge after edge cutting. The present application does not need any auxiliary mechanism, relies on the speed difference between the edge cutting shear and the disc shear to form a constant micro-tension, and makes the scrap edge automatically tighten and straighten, thus solving the industry problems such as scrap edge disorder, edge blocking, winding, strip head wrinkle and the like in the high-speed trimming and edge cutting process, and the trimming burr is ≤ 0.02 mm and the qualified rate is ≥ 99.5%.

Description

Technical Field

[0001] This invention belongs to the field of metal sheet and strip finishing technology, and specifically relates to a high-speed edge trimming and crushing method and its application for 0.15-0.55mm non-oriented silicon steel. Background Technology

[0002] 0.15-0.55mm non-oriented silicon steel is the core material for motor cores, and its edge quality directly affects the lamination accuracy and magnetic properties. In the slitting process, edge trimming and scrapping are critical steps on continuous production lines—after the strip is sheared by a disc to remove waste edges on both sides, the waste edges need to be scrapped into shorter pieces for collection and reuse. Currently, mainstream production lines in the industry are designed to speeds of 400-600m / min, moving towards higher efficiency but also revealing serious issues with process stability.

[0003] Non-oriented silicon steel with a thickness of 0.15-0.55mm has the physical characteristics of being soft, lightweight, having a smooth surface, and being prone to edge deformation. In high-speed edge trimming and shredding processes, the following common technical challenges have long existed in the industry: First, thin strip heads (especially extremely thin specifications with a thickness <0.35mm) are prone to wrinkling, deviation, or even edge blockage during the threading and low-speed start-up stages. Traditional constant speed ratio control cannot simultaneously meet the two drastically different mechanical requirements of low-speed start-up and high-speed stability. Second, after the waste edge is removed by the disc shear, the open space before entering the shredding shear is prone to slackness and wobbling due to the lack of effective constraint. Entanglement and other phenomena can cause the waste edge to become disordered, instantly blocking the entry of the edge trimmer and forcing the production line to stop. Third, when accelerating again after a temporary stop, the inertia of the rotating parts of the edge trimmer lags behind the speed change of the main production line, causing the waste edge to be subjected to instantaneous impact tension changes, further aggravating the risk of disorder. Fourth, existing process solutions usually use traction rollers and pinch rollers to apply mechanical constraints to the waste edge, or use auxiliary means such as negative pressure adsorption and airflow purging to guide it. However, such measures not only increase the complexity of the equipment and maintenance costs, but also make it easier to cause secondary edge damage for extremely thin strips of 0.15mm, and even cause strip breakage accidents.

[0004] A systematic search revealed that no publicly available technology can simultaneously achieve the dual goals of preventing wrinkles at the thin strip head and ensuring self-stabilization of waste edges throughout the entire process without the need for auxiliary mechanisms. This technological gap severely restricts the production line efficiency and product quality improvement of high-grade thin-gauge non-oriented silicon steel. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide a high-speed edge trimming and crushing method and application for 0.15-0.55mm non-oriented silicon steel. This invention utilizes a triple-coordinated control system of thickness-graded speed ratio of the disc shear, speed-graded speed ratio of the edge trimming shear, and temporary stop inertia compensation. Without relying on any auxiliary mechanisms such as traction, clamping, negative pressure, or mechanical guidance, it establishes a constant micro-tension on the waste edge based on precisely quantified speed differences. This completely solves the common industry problems that have long existed in high-speed edge trimming and crushing of 0.15-0.55mm thin-gauge non-oriented silicon steel, such as leading wrinkles, waste edge swaying, entanglement, and edge blockage. In actual operation, the edge blockage rate and leading wrinkle rate are both 0, the edge burr is stably controlled at ≤0.02mm, and the pass rate is as high as ≥99.5%.

[0006] The technical solution of this invention is: a high-speed edge trimming and crushing method for 0.15-0.55mm non-oriented silicon steel, comprising the following steps: Step 1: Strip centering and shearing under constant tension: The strip runs at 0-600m / min and enters the disc shear after centering and stabilizing under constant tension; Step 2: Set the disc shearing speed in segments according to the strip thickness and running speed; Step 3: Set the edge trimming speed in segments according to the strip speed, and always keep the edge trimming speed higher than the disc shearing speed; Step 4: Temporary shutdown inertia compensation: When shutting down, the edge shear should run at 20m / min to eliminate inertia lag; Step 5: Waste edge self-stabilization: A constant micro-tension is formed by the speed difference between the disc shear and the scrap shear, so that the waste edge is automatically tightened and straightened under all working conditions, realizing the self-stabilized conveying and cutting of waste edge; Step Six: After the edges are broken, the material falls naturally, and waste is discharged by gravity without negative pressure.

[0007] Preferably, in step two, the disc shearing speed is set in segments according to the strip thickness and running speed, specifically as follows: When the strip thickness is ≥0.35mm, the disc shearing speed is 1.02 times the strip speed; When the strip thickness is <0.35mm and the strip speed is ≤30m / min, the disc shearing speed is 1.04 times the strip speed; When the strip thickness is <0.35mm and the strip speed is >30m / min, the disc shearing speed is 1.02 times the strip speed.

[0008] Preferably, in step three, the edge trimming speed is set segment by segment according to the strip speed, specifically as follows: When the strip speed is <400m / min, the edge trimming speed is 1.08 times the strip speed; When the strip speed is ≥400m / min, the edge trimming speed is 1.17 times the strip speed.

[0009] Preferably, the constant micro-tension value formed in step five is proportional to the strip thickness and linearly related to the speed ratio difference, and is always controlled within the range of 2% to 5% of the strip yield strength.

[0010] Preferably, in step six, the waste material is discharged naturally after the edge is crushed. The discharge is completed through a pressureless chute. No airflow suction or mechanical material feeding device is installed in the chute. The material is discharged by the gravity of the waste edge itself and the kinetic energy of the edge crusher exit speed.

[0011] An application of a high-speed edge trimming and burr removal method for 0.15-0.55mm non-oriented silicon steel. The method is applicable to oriented silicon steel and achieves the following results throughout the entire process, including the entire speed range of 0-600m / min, the entire thickness range of 0.15-0.55mm, and the entire process of temporary stop and restart: the edge trimming burr height is ≤0.02mm, the edge trimming qualification rate is ≥99.5%, and the edge blocking rate and the head wrinkling rate are both 0.

[0012] An application of a high-speed edge trimming and burr removal method for 0.15-0.55mm non-oriented silicon steel, the method is also applicable to oriented silicon steel, and the burr height of the trimming is ≤0.02mm throughout the entire speed range of 0-600m / min, the entire thickness range of 0.15-0.55mm, and the entire process of temporary stop and restart. The trimming qualification rate is ≥99.5%, and the edge blocking rate and the head wrinkling rate are both 0.

[0013] The technical advantages of this invention are as follows: 1. This invention achieves triple coordinated control through the thickness-graded speed ratio of the disc shear, the speed-graded speed ratio of the edge trimming shear, and the inertia compensation during temporary shutdowns. Without relying on any auxiliary mechanisms such as traction, clamping, negative pressure, or mechanical guidance, it establishes a constant micro-tension on the waste edge by relying on precisely quantified speed differences. This completely solves the common industry problems of leading wrinkles, waste edge swaying, entanglement, and edge blockage that have long existed in high-speed edge trimming and edge breaking of 0.15-0.55mm thin-gauge non-oriented silicon steel. In actual operation, the edge blockage rate and leading wrinkle rate are both 0, and the cutting burr is stably controlled at ≤0.02mm, with a pass rate as high as ≥99.5%. 2. This invention increases the disc shear speed ratio to 1.04 times in the low-speed range (≤30m / min), actively compensating for the additional frictional resistance of the thin strip in the transition zone from boundary lubrication to dynamic pressure lubrication, so that the strip head is forcibly straightened at the moment of threading. 3. This invention employs constant micro-tension control to ensure a smooth and impact-free waste edge removal process, uniform stress on the strip edge, and consistently controlled burr height of ≤0.02mm. This significantly reduces downgraded and scrap losses caused by edge defects, providing high-quality edge conditions for the precision punching and stacking of high-grade, thin-gauge non-oriented silicon steel. 4. This invention eliminates all auxiliary combing components commonly used in traditional solutions, such as traction rollers, pinch rollers, negative pressure adsorption systems, airflow purging devices, and mechanical guiding mechanisms, greatly simplifying the overall structure. This not only reduces initial investment costs but, more importantly, eliminates the risk of contact wear between the aforementioned auxiliary components and the thin strip, completely avoiding secondary scratches or breakage hazards on extremely thin strips at the 0.15mm level. Simultaneously, due to the significant reduction in moving parts, the daily maintenance workload is significantly reduced, resulting in an extremely low failure rate and truly achieving maintenance-free operation. 5. This invention covers the entire speed range of 0-600 m / min, including low-speed start-up, acceleration, constant speed, deceleration, and temporary stop. Through a two-dimensional "thickness-speed" boundary formed by a 0.35 mm thickness threshold and speed thresholds of 30 m / min and 400 m / min, the control strategy can respond to both changes in material stiffness and changes in operating conditions, making it particularly suitable for the frequent speed changes and start-stop operations of modern flexible production lines. During temporary stoppages, the edge shear maintains a low speed of 20 m / min, which not only maintains the integrity of the hydrodynamic oil film in the main shaft bearing to prevent dry friction, but also eliminates the inertial lag clearance of the transmission chain during restart, ensuring seamless connection and zero operational disorder during the stop-and-start process.

[0014] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a flowchart of a high-speed edge trimming and breaking method for 0.15-0.55mm non-oriented silicon steel according to the present invention.

[0016] Figure 2 This is a schematic diagram of the overall layout of the process of this invention.

[0017] Attached reference numerals: 1-Strip material; 2-Disc shear; 3-Waste edge; 4-Scrap edge shear; 5-Negative pressure chute. Detailed Implementation

[0018] Example 1 like Figure 1 , Figure 2 As shown, a high-speed edge trimming method for 0.15-0.55mm non-oriented silicon steel includes the following steps: Step 1: Constant tension centering and shearing of strip 1: The strip runs at 0-600m / min and enters the disc shear 2 after centering and constant tension stabilization; Step 2: Set the linear speed of the disc shear 2 in segments according to the thickness of strip 1 and the running speed; Step 3: Set the linear speed of the edge trimmer 4 according to the speed of strip 1 in segments. The speed of edge trimmer 4 should always be higher than the speed of disc shear 2. Step 4: Temporary shutdown inertia compensation: When shutting down, the edge shear 4 should maintain a speed of 20m / min to eliminate inertia lag; Step 5: Waste edge self-stabilization: A constant micro-tension is formed by the speed difference between the disc shear 2 and the scrap shear 4, so that the waste edge 3 is automatically tightened and straightened under all working conditions, realizing the self-stabilized conveying and cutting of the waste edge 3; Step 6: After edge crushing 3, the material falls naturally and is discharged by gravity without negative pressure, exiting from the negative pressure chute 5.

[0019] Preferably, in step two, the disc shearing speed is set in segments according to the strip thickness and running speed, specifically as follows: When the strip thickness is ≥0.35mm, the disc shearing speed is 1.02 times the strip speed; When the strip thickness is <0.35mm and the strip speed is ≤30m / min, the disc shearing speed is 1.04 times the strip speed; When the strip thickness is <0.35mm and the strip speed is >30m / min, the disc shearing speed is 1.02 times the strip speed.

[0020] This invention uses a strip thickness of 0.35 mm as the stiffness threshold. When the thickness is ≥0.35 mm, the strip has sufficient bending stiffness. The disc shearing speed is set to 1.02 times the strip speed. This 2% advance is only used to overcome the micro-sliding friction between the disc shearing edge and the strip. When the thickness is <0.35 mm, the strip flexibility increases significantly. In the low-speed start-up section ≤30 m / min, the strip and guide roller are in the transition zone from boundary lubrication to dynamic pressure lubrication. The sudden increase in static friction coefficient leads to a sharp increase in the risk of longitudinal compression instability. Therefore, the disc shearing speed is set to 1.04 times the strip speed. A 4% advance traction is used to actively compensate for the additional frictional resistance in the low-speed section and forcibly straighten the strip head to eliminate wrinkles. When the speed is >30 m / min and the thickness is <0.35 mm, the dynamic pressure lubrication is fully established, the friction coefficient returns to stability, and the disc shearing speed returns to 1.02 times the strip speed.

[0021] Preferably, in step three, the edge trimming speed is set segment by segment according to the strip speed, specifically as follows: When the strip speed is <400m / min, the edge trimming speed is 1.08 times the strip speed; When the strip speed is ≥400m / min, the edge trimming speed is 1.17 times the strip speed.

[0022] The present invention uses a strip speed of 400m / min as the threshold for the dynamic stability of the waste edge. When the strip speed is <400m / min, the centrifugal force of the waste edge is less than its own weight, and only a micro-tension generated by a speed ratio of 1.08 times is needed to overcome the sagging and swaying of the waste edge. When the belt speed is ≥400m / min, the linear velocity of the waste edge increases sharply. Its centrifugal stiffening effect and air resistance increase quadratically. At the same time, the rotational inertia of the scrap edge shear rotor itself generates significant inertial lag in the high-speed zone. The speed ratio needs to be increased to 1.17 times the belt speed. The additional 9% speed difference, compared to 1.08 times in the low-speed section, is specifically used to compensate for the centrifugal inertia and air resistance loss in the high-speed section, ensuring that the waste edge maintains constant axial micro-tension without loosening throughout the entire speed range. When the main machine is temporarily stopped, the edge trimmer does not stop with the main machine, but maintains a low speed of 20m / min. This speed value is set according to the mechanical time constant of the edge trimmer transmission chain and the excitation maintenance threshold of the motor. It is used to maintain the hydrodynamic oil film at the gearbox and the cutter shaft bearing and the preload of the transmission chain, eliminate the acceleration lag gap caused by the static friction dead zone when re-accelerating after a zero-speed stop, and prevent the waste edge from accumulating and becoming disordered.

[0023] Preferably, the constant micro-tension value formed in step five is proportional to the strip thickness and linearly related to the speed ratio difference, and is always controlled within the range of 2% to 5% of the strip yield strength.

[0024] Preferably, in step six, the waste material is discharged naturally after the edge is crushed. The discharge is completed through a pressureless chute. No airflow suction or mechanical material feeding device is installed in the chute. The material is discharged by the gravity of the waste edge itself and the kinetic energy of the edge crusher exit speed.

[0025] Example 2 An application of a high-speed edge trimming and burr removal method for 0.15-0.55mm non-oriented silicon steel. The method is applicable to oriented silicon steel and achieves the following results throughout the entire process, including the entire speed range of 0-600m / min, the entire thickness range of 0.15-0.55mm, and the entire process of temporary stop and restart: the edge trimming burr height is ≤0.02mm, the edge trimming qualification rate is ≥99.5%, and the edge blocking rate and the head wrinkling rate are both 0.

[0026] Example 3 An application of a high-speed edge trimming and burr removal method for 0.15-0.55mm non-oriented silicon steel, the method is also applicable to oriented silicon steel, and the burr height of the trimming is ≤0.02mm throughout the entire speed range of 0-600m / min, the entire thickness range of 0.15-0.55mm, and the entire process of temporary stop and restart. The trimming qualification rate is ≥99.5%, and the edge blocking rate and the head wrinkling rate are both 0.

[0027] This invention employs a triple-coordinated control system, combining the thickness-graded speed ratio of the disc shear, the speed-graded speed ratio of the edge trimming shear, and temporary stop inertia compensation. Without relying on any auxiliary mechanisms such as traction, clamping, negative pressure, or mechanical guidance, it establishes a constant micro-tension on the waste edge by relying on precisely quantified speed differences. This completely solves the common industry problems that have long existed in high-speed edge trimming of 0.15-0.55mm thin-gauge non-oriented silicon steel and oriented silicon steel, including issues like leading wrinkles, waste edge swaying, entanglement, and edge blockage. In actual operation, the edge blockage rate and leading wrinkle rate are both 0, the cutting burr is stably controlled at ≤0.02mm, and the pass rate is as high as ≥99.5%.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-speed edge trimming and breaking method for 0.15-0.55mm non-oriented silicon steel, characterized in that, Includes the following steps: Step 1: Strip centering and shearing under constant tension: The strip runs at 0-600m / min and enters the disc shear after centering and stabilizing under constant tension; Step 2: Set the disc shearing speed in segments according to the strip thickness and running speed; Step 3: Set the edge trimming speed in segments according to the strip speed, and always keep the edge trimming speed higher than the disc shearing speed; Step 4: Temporary shutdown inertia compensation: When shutting down, the edge shear should run at 20m / min to eliminate inertia lag; Step 5: Waste edge self-stabilization: A constant micro-tension is formed by the speed difference between the disc shear and the scrap shear, so that the waste edge is automatically tightened and straightened under all working conditions, realizing the self-stabilized conveying and cutting of waste edge; Step Six: After the edges are broken, the material falls naturally, and waste is discharged by gravity without negative pressure.

2. The high-speed edge trimming and breaking method for 0.15-0.55mm non-oriented silicon steel according to claim 1, characterized in that, In step two, the disc shearing speed is set in segments according to the strip thickness and running speed, specifically as follows: When the strip thickness is ≥0.35mm, the disc shearing speed is 1.02 times the strip speed; When the strip thickness is <0.35mm and the strip speed is ≤30m / min, the disc shearing speed is 1.04 times the strip speed; When the strip thickness is <0.35mm and the strip speed is >30m / min, the disc shearing speed is 1.02 times the strip speed.

3. The high-speed edge trimming and breaking method for 0.15-0.55mm non-oriented silicon steel according to claim 1, characterized in that, In step three, the edge trimming speed is set segment by segment according to the strip speed, specifically as follows: When the strip speed is <400m / min, the edge trimming speed is 1.08 times the strip speed; When the strip speed is ≥400m / min, the edge trimming speed is 1.17 times the strip speed.

4. The high-speed edge trimming and breaking method for 0.15-0.55mm non-oriented silicon steel according to claim 1, characterized in that, The constant micro-tension value formed in step five is proportional to the strip thickness and linearly related to the speed ratio difference, and is always controlled within the range of 2% to 5% of the strip yield strength.

5. A high-speed edge trimming and breaking method for 0.15-0.55mm non-oriented silicon steel according to claim 1, characterized in that, In step six, the waste material is discharged naturally after being crushed. The discharge is completed through a pressure-free chute. No airflow suction or mechanical material feeding device is installed in the chute. The material is discharged by relying on the gravity of the waste material itself and the kinetic energy of the crushing shear outlet speed.

6. An application of a high-speed edge trimming and breaking method for 0.15-0.55mm non-oriented silicon steel, characterized in that, The method is applicable to grain-oriented silicon steel, and the burr height of the cutting edge is ≤0.02mm throughout the entire speed range of 0-600m / min, the thickness range of 0.15-0.55mm, and the entire process of temporary stop and restart. The edge burr height is ≥0.02mm, the edge burr pass rate is ≥99.5%, and the edge blocking rate and the head wrinkling rate are both 0.

7. An application of a high-speed edge trimming and breaking method for 0.15-0.55mm non-oriented silicon steel, characterized in that, The method is also applicable to grain-oriented silicon steel, and in the entire speed range of 0-600m / min, the entire thickness range of 0.15-0.55mm, and the entire process of temporary stop and restart, the burr height of the cutting edge is ≤0.02mm, the cutting edge qualification rate is ≥99.5%, and the edge blocking rate and the head wrinkling rate are both 0.

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