Method for straightening the edge of a strip presenting vibration marks in a low speed running state

Abstract

The application discloses a strip steel edge linear grinding method for showing vibration line defects in a low-speed running state, and the method comprises the following steps: after a strip steel is tensioned, the strip steel is run at a low speed; the width of the strip steel is detected; the running speed of a strip steel production line is adjusted online and self-adaptively according to the width of the strip steel; an edge grinding device grinds the surfaces of both sides of the strip steel; the edge grinding speed is adjusted online and self-adaptively according to the running speed of the strip steel production line; a parallel air cylinder is started to control an oil stone to perform reciprocating grinding movement; the edge region of the strip steel is closely observed to timely find possible vibration line defects; if the vibration line defects are shown, the characteristic information of the vibration line defects is detected and uploaded to a control system; the control system issues a real-time alarm and takes corresponding processing measures to prevent the defects from continuously expanding. The method adopts online strip steel edge grinding, self-adaptive production line speed and grinding speed adjustment, realizes a dynamic grinding frequency adjustment mechanism, improves the grinding precision and efficiency of the strip steel edge, and ensures effective detection of the surface defects of the strip steel.

Description

Technical Field

[0001] This invention relates to the field of surface quality inspection technology for cold-rolled strip steel, and in particular to a method for straight grinding of the edge of strip steel that exhibits vibration pattern defects under low-speed operation. Background Technology

[0002] Manual grinding of defects such as vibration marks on cold-rolled strip steel is a process of bidirectional grinding of the strip steel surface using abrasive materials such as oilstones. Operators manually operate grinding tools to bring vibration marks and other defects to the surface of the strip steel. This process aims to reveal the location, shape, and characteristics of these defects for timely identification and treatment. Selecting the appropriate oilstone is crucial during the grinding process. Different defects may require oilstones of different hardness and grit. Operators must select suitable abrasive materials based on the specific circumstances, ensuring that the materials grind the strip steel surface and effectively reveal the vibration marks and other defects.

[0003] During grinding, operators must carefully control the grinding force and time to avoid over- or under-grinding. Simultaneously, visual inspection and tactile examination should be used to ensure that defects such as vibration marks are clearly visible on the strip surface for subsequent detection and analysis. Data acquired by the inspection equipment allows operators to record the characteristics, size, and location of each defect. This data helps establish a database, conduct statistical analysis, and provide a basis for subsequent process improvements. Upon discovering defects such as vibration marks, immediate measures should be taken to repair or replace the rolls to ensure production quality and stable equipment operation.

[0004] Typically, strip steel surface grinding uses simple mechanical equipment, which is inefficient and lacks precision, making it impossible to ensure the uniformity and consistency of grinding. Therefore, it requires a lot of manual intervention and monitoring, increasing labor costs. It is also susceptible to human factors and is difficult to adapt to the production of strip steel with different specifications and quality requirements, requiring frequent adjustments and improvements. It lacks real-time monitoring capabilities, making it difficult to detect and deal with problems in the production process in a timely manner, resulting in poor controllability. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for linear grinding of strip edges that exhibit vibration pattern defects under low-speed operation. This method overcomes the defects of traditional strip surface grinding operations by adopting online strip edge grinding combined with adaptive production line speed and grinding speed adjustment to realize a dynamic grinding frequency adjustment mechanism, thereby improving the grinding accuracy and efficiency of strip edges and ensuring the effective detection of vibration pattern defects on the strip surface.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for straight-line grinding of the strip edge exhibiting vibration pattern defects under low-speed operation, comprising the following steps:

[0007] Step 1: Thread the strip steel and establish surface tension, then start the strip steel production line and run it at low speed;

[0008] Step 2: Use a width measuring device to detect the width of the strip steel;

[0009] Step 3: Adjust the strip production line speed online adaptively based on the strip width;

[0010] Step 4: The edge grinding device contacts both sides of the strip surface and ensures that the strip surface is in effective contact with the oilstone of the edge grinding device;

[0011] Step 5: Start the edge grinding device and adjust the edge grinding speed online according to the strip production line speed. Control the oilstone to perform reciprocating grinding motion by starting the parallel cylinder.

[0012] Step 6: Since vibration mark defects may be located at the edge of the strip, grinding the strip edge can trigger or aggravate the appearance of vibration marks. During grinding, closely observe the strip edge area to promptly detect any potential vibration marks.

[0013] Step 7: If vibration patterns appear, detect the characteristic information of the vibration pattern defects, including the shape, size and location of the vibration pattern defects, and upload the characteristic information of the vibration pattern defects to the control system.

[0014] Step 8: The control system stores and analyzes the characteristic information of the vibration pattern defect, issues alarms in real time, and takes corresponding measures in a timely manner, including stopping the machine and / or adjusting the grinding parameters, to prevent the defect from continuing to expand.

[0015] Furthermore, step three, which involves online adaptive adjustment of the strip production line speed based on the strip width, includes the following steps:

[0016] Step 1: Establish a linear functional relationship between strip width W and strip production line speed V.

[0017] When W≤W0, V maintains its maximum speed Vmax;

[0018] When W > W0, V = Vmax - k(W - W0) (1)

[0019] Where k is the linear deceleration rate, k=(Vmax-Vmin) / (Wmax-W0), Vmax is the maximum operating speed of the strip production line, Vmin is the minimum operating speed of the strip production line, W0 is the critical width of the strip, and Wmax is the maximum width of the strip.

[0020] Step 2: Read the current strip width W and determine whether W is greater than the critical strip width W0. If so, calculate the corresponding strip production line running speed V according to formula (1). Otherwise, keep the strip production line running speed V at the maximum speed Vmax and output control instructions to control the strip production line to run at speed V.

[0021] Furthermore, step five, which involves online adaptive adjustment of the edge grinding speed, includes the following steps:

[0022] Step 1: Establish a linear regression model.

[0023] Y = k × X + b (2)

[0024] Where Y represents the grinding frequency, X represents the strip running speed, k is the slope, which represents the number of units the frequency changes for every 1 unit change in speed, and b is the y-intercept.

[0025] Step 2: Calculate the model parameters. The slope k and intercept b are obtained based on the given data points. The given data points are: when the strip running speed is 5m / s, the grinding frequency is 1Hz; when the strip running speed is 3m / s, the grinding frequency is 0.5Hz. Set the grinding speed according to formula (2).

[0026] Furthermore, the edge grinding device in step four includes an upper mounting plate, a lower mounting plate, a parallel cylinder, a spring, a mounting plate, and a grinding stone. The upper and lower mounting plates are arranged parallel to each other and spaced apart. The spring is spaced between the upper and lower mounting plates along the circumferential direction. The parallel cylinder is located on the bottom surface of the lower mounting plate. The mounting plate is located on the parallel cylinder. The grinding stone is located on the mounting plate. The parallel cylinder drives the mounting plate and the grinding stone to perform reciprocating grinding motion.

[0027] The present invention employs the above-mentioned technical solution for the linear grinding method of strip steel edges exhibiting vibration pattern defects under low-speed operation. Specifically, this method involves threading the strip steel and establishing surface tension, starting the strip steel production line and operating it at low speed; detecting the strip steel width; adaptively adjusting the strip steel production line speed online based on the strip steel width; grinding both sides of the strip steel surface using an edge grinding device; and adaptively adjusting the edge grinding speed online based on the strip steel production line speed, controlling the reciprocating grinding motion of the oilstone by activating a parallel cylinder; simultaneously, closely observing the strip steel edge area to promptly detect any potential vibration patterns; if vibration patterns appear, detecting the characteristic information of the vibration pattern defect and uploading it to the control system; and the control system issuing a real-time alarm and taking corresponding measures to prevent the defect from further expanding. This method overcomes the shortcomings of traditional strip steel surface grinding operations by employing online strip steel edge grinding combined with adaptive production line speed and grinding speed adjustment to achieve a dynamic grinding frequency adjustment mechanism, improving the grinding accuracy and efficiency of the strip steel edges, and ensuring the effective detection of vibration pattern defects on the strip steel surface. Attached Figure Description

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0029] Figure 1 This is a flowchart of the method for straight grinding of strip edges that exhibits vibration pattern defects under low-speed operation, according to the present invention.

[0030] Figure 2 This is a schematic diagram of the straight-line grinding of the strip edge in this method;

[0031] Figure 3 This is a schematic diagram of the edge grinding device in this method. Detailed Implementation

[0032] Implementation, for example Figure 1 and Figure 2 As shown, the method for straight-line grinding of the strip edge exhibiting vibration pattern defects under low-speed operation according to the present invention includes the following steps:

[0033] Step 1: Thread the strip steel 1 and establish surface tension, then start the strip steel production line and run it at low speed;

[0034] Step 2: Use a width measuring device to measure the width of strip 1;

[0035] Step 3: Adjust the strip production line speed online adaptively based on the strip width;

[0036] Step 4: The edge grinding device 2 contacts both sides of the strip steel 1 and ensures that the surface of the strip steel 1 is in effective contact with the oilstone of the edge grinding device 2;

[0037] Step 5: Start the edge grinding device 2 and adjust the edge grinding speed online according to the strip production line speed. Control the oilstone to perform reciprocating grinding motion by starting the parallel cylinder.

[0038] Step 6: Since vibration mark defects may be located at the edge of strip 1, grinding the edge of strip 1 may trigger or aggravate the appearance of vibration marks. While grinding, closely observe the edge area of ​​strip 1 to promptly detect any possible vibration marks.

[0039] Step 7: If vibration marks appear, detect the characteristic information of the vibration mark defects, including the shape, size and location of the defects, and upload the characteristic information of the roller defects to the control system.

[0040] Step 8: The control system stores and analyzes the characteristic information of the vibration pattern defect, issues alarms in real time, and takes corresponding measures in a timely manner, including stopping the machine and / or adjusting the grinding parameters, to prevent the defect from continuing to expand.

[0041] Through the steps described above in this method, the edge of the strip steel can be ground using an edge grinding device, revealing vibration pattern defects. This allows for timely measures to be taken for treatment and repair, thereby improving the quality of the strip steel products.

[0042] Preferably, step three, which involves online adaptive adjustment of the strip production line speed based on the strip width, includes the following steps:

[0043] Step 1: Establish a linear functional relationship between strip width W and strip production line speed V.

[0044] When W≤W0, V maintains its maximum speed Vmax;

[0045] When W > W0, V = Vmax - k(W - W0) (1)

[0046] Where k is the linear deceleration rate, k=(Vmax-Vmin) / (Wmax-W0), Vmax is the maximum operating speed of the strip production line, Vmin is the minimum operating speed of the strip production line, W0 is the critical width of the strip, and Wmax is the maximum width of the strip.

[0047] Step 2: Read the current strip width W and determine whether W is greater than the critical strip width W0. If so, calculate the corresponding strip production line running speed V according to formula (1). Otherwise, keep the strip production line running speed V at the maximum speed Vmax and output control instructions to control the strip production line to run at speed V.

[0048] By adaptively adjusting the running speed of the strip steel production line online, the production line speed can be dynamically adjusted for different strip steel widths, ensuring production efficiency and product quality for various strip steel specifications. Its algorithm is simple to set and takes into account the characteristics of the problem itself, making it highly practical.

[0049] Preferably, step five, which involves online adaptive adjustment of the edge grinding speed, includes the following steps:

[0050] Step 1: Establish a linear regression model.

[0051] Y = k × X + b (2)

[0052] Where Y represents the grinding frequency, X represents the strip running speed, k is the slope, which represents the number of units the frequency changes for every 1 unit change in speed, and b is the y-intercept.

[0053] Step 2: Calculate the model parameters. The slope k and intercept b are obtained based on the given data points. The given data points are: when the strip running speed is 5m / s, the grinding frequency is 1Hz; when the strip running speed is 3m / s, the grinding frequency is 0.5Hz. Set the grinding speed according to formula (2).

[0054] Linear regression models can calculate the corresponding grinding frequency for any given strip running speed, ensuring that grinding is carried out at the optimal frequency, thereby maintaining consistent grinding quality, avoiding over-grinding or under-grinding, and improving the efficiency and flexibility of the production line.

[0055] In actual system operation, the required grinding frequency is calculated based on the real-time speed of the rolling mill using a linear regression model. This mechanism ensures that the frequency of the edge grinding device can be adjusted in a timely manner as the strip running speed changes, thereby optimizing the grinding effect and ensuring the quality of strip edge processing.

[0056] Preferred, such as Figure 3 As shown, the edge grinding device 2 in step four includes an upper mounting plate 21, a lower mounting plate 22, a parallel cylinder 23, a spring 24, a mounting plate 25, and a grinding stone 26. The upper mounting plate 21 and the lower mounting plate 22 are arranged in parallel and spaced apart. The spring 24 is spaced apart between the upper mounting plate 21 and the lower mounting plate 22 along the circumferential direction. The parallel cylinder 23 is located on the bottom surface of the lower mounting plate 22. The mounting plate 25 is located on the parallel cylinder 23. The grinding stone 26 is located on the mounting plate 25. The parallel cylinder 23 drives the mounting plate 25 and the grinding stone 26 to perform reciprocating grinding motion.

[0057] The edge grinding device is used for edge grinding of workpieces such as strip steel. Through a precise control system, it ensures stability and efficiency during the grinding process and achieves floating grinding. During operation, a parallel cylinder receives a control signal, driving two oilstones to perform parallel reciprocating grinding motions. Simultaneously, springs stabilize the pressure and maintain close contact between the oilstones and the strip steel surface. This edge grinding device features a high degree of automation, excellent grinding effect, and simple operation, making it suitable for high-precision, high-efficiency grinding of strip steel edges.

[0058] This method comprehensively considers the process characteristics of cold-rolled strip steel quality inspection, using an online edge grinding device combined with adaptive production line speed adjustment, as well as online adaptive adjustment of edge grinding speed, to ensure the effective detection of vibration mark defects on the strip steel surface, thereby ensuring strip steel production quality and stable equipment operation, and providing a basis for subsequent process improvement.

Claims

1. A method for straight-line grinding of the edge of a strip steel exhibiting vibration pattern defects under low-speed operation, characterized in that... Includes the following steps: Step 1: Thread the strip steel and establish surface tension, then start the strip steel production line and run it at low speed; Step 2: Use a width measuring device to detect the width of the strip steel; Step 3: Adjust the strip production line speed online adaptively based on the strip width; Step 4: The edge grinding device contacts both sides of the strip surface and ensures that the strip surface is in effective contact with the oilstone of the edge grinding device; Step 5: Start the edge grinding device and adjust the edge grinding speed online according to the strip production line speed. Control the oilstone to perform reciprocating grinding motion by starting the parallel cylinder. Step 6: Since vibration mark defects may be located at the edge of the strip, grinding the strip edge can trigger or aggravate the appearance of vibration marks. During grinding, closely observe the strip edge area to promptly detect any potential vibration marks. Step 7: If vibration patterns appear, detect the characteristic information of the vibration pattern defects, including the shape, size and location of the vibration pattern defects, and upload the characteristic information of the vibration pattern defects to the control system. Step 8: The control system stores and analyzes the characteristic information of the vibration pattern defects, issues alarms in real time, and takes corresponding measures in a timely manner, including stopping the machine and / or adjusting the grinding parameters, to prevent the vibration pattern defects from continuing to expand. Step three, which involves online adaptive adjustment of the strip production line speed based on the strip width, includes the following steps: Step 1: Establish a linear functional relationship between strip width W and strip production line speed V. When W≤W0, V maintains its maximum speed Vmax; When W > W0, V = Vmax - k(W - W0) (1). Where k is the linear deceleration rate, k=(Vmax-Vmin) / (Wmax-W0), Vmax is the maximum operating speed of the strip production line, Vmin is the minimum operating speed of the strip production line, W0 is the critical width of the strip, and Wmax is the maximum width of the strip. Step 2: Read the current strip width W and determine whether W is greater than the critical strip width W0. If so, calculate the corresponding strip production line running speed V according to formula (1). Otherwise, keep the strip production line running speed V at the maximum speed Vmax and output control instructions to control the strip production line to run at speed V. Step five, which involves online adaptive adjustment of the edge grinding speed, includes the following steps: Step 1: Establish a linear regression model. Y = k × X + b (2) Where Y represents the grinding frequency, X represents the strip running speed, k is the slope, which represents the number of units the frequency changes for every 1 unit change in speed, and b is the y-intercept. Step 2: Calculate the model parameters. The slope k and intercept b are obtained based on the given data points. The given data points are: when the strip running speed is 5m / s, the grinding frequency is 1Hz; when the strip running speed is 3m / s, the grinding frequency is 0.5Hz. Set the grinding speed according to formula (2).

2. The method for straight-line grinding of strip edges exhibiting vibration pattern defects under low-speed operation as described in claim 1, characterized in that: The edge grinding device in step four includes an upper mounting plate, a lower mounting plate, a parallel cylinder, a spring, a mounting plate, and a grinding stone. The upper and lower mounting plates are arranged in parallel and spaced apart. The spring is spaced between the upper and lower mounting plates along the circumferential direction. The parallel cylinder is located on the bottom surface of the lower mounting plate. The mounting plate is located on the parallel cylinder. The grinding stone is located on the mounting plate. The parallel cylinder drives the mounting plate and the grinding stone to perform reciprocating grinding motion.

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