A method, system, rolling equipment, and readable storage medium for testing the deflection of a roller.

Abstract

This application relates to the field of roller structure deformation detection technology, and discloses a roller deflection testing method, system, rolling equipment, and readable storage medium. The method of this application determines the thickness range of a metal sheet based on the operating parameters of the target roller; selects a target thickness value from the range to prepare a metal sheet sample; controls the expansion of the roller gap of the target roller to form an installation gap, and attaches the metal sheet sample to the roller surface of the target roller; controls the roller gap to return from the installation gap to the thickness value of the metal sheet sample, so that the target roller and the metal sheet sample are in close contact; applies a force to the target roller in the contact state to form an indentation, releases the force to release the roller gap, and obtains the indented metal sheet sample; obtains the thickness difference based on the indented metal sheet sample, and then calculates the deflection difference to generate the deflection difference curve of the target roller. The method of this application can directly quantify the actual deflection response within the rolling area, effectively improving the reliability and applicability of roller deformation identification.

Description

Technical Field

[0001] This application relates to the field of roller structure deformation detection technology, and in particular to a roller deflection testing method, system, roller pressing equipment and readable storage medium. Background Technology

[0002] Currently, the main technologies for measuring roller deflection include laser measurement, mechanical contact measurement, and image measurement.

[0003] Laser measurement typically uses laser displacement sensors to scan the deflection deformation of the roller surface. It features non-contact and high precision, but its equipment cost is relatively high and it is quite sensitive to installation environment conditions. For example, in industrial environments with vibration, strong light interference, or other disturbances, reflection interference or error amplification can easily occur, affecting measurement stability.

[0004] Mechanical contact measurement methods involve setting displacement sensors, contact devices, and other components on the roller body or support structure to record the relative displacement under stress, thereby estimating the deflection. This method has good reliability in scenarios where space permits and contact points can be placed at the boundaries. However, in lithium battery rolling equipment, especially in the area between rollers where the electrode sheet is rolled (i.e., the rolling surface), the space is extremely small, making it almost impossible to place contact measurement devices in this area. This results in the inability to obtain the deflection changes that actually occur during the plastic pressing process.

[0005] Image measurement methods use industrial cameras to record the surface morphology changes of rollers under different loading conditions, and then combine image processing and displacement tracking algorithms to calculate the deflection deformation trend. Although this method has the advantage of being non-contact, it requires high image quality and has poor stability under conditions of strong light, dust, vibration, and other interference, making it difficult to apply to typical complex working environments such as lithium battery production lines.

[0006] In summary, existing roller deflection measurement solutions generally suffer from problems such as high equipment costs, poor adaptability to working conditions, or inability to measure the actual deflection difference in the rolling area. Summary of the Invention

[0007] In view of this, the embodiments of this application provide a roller deflection testing method, system, rolling equipment and readable storage medium, which can effectively solve the problems of high equipment cost, poor adaptability to working conditions or inability to measure the actual deflection difference in the rolling area in existing roller deflection measurement schemes.

[0008] In a first aspect, embodiments of this application provide a method for testing roller deflection, including:

[0009] The thickness range of the metal sheet is determined based on the operating parameters of the target roller.

[0010] Select a target thickness value from the thickness range and prepare a metal sheet sample;

[0011] Control the expansion of the roll gap of the target roller shaft to form an installation gap, and attach the metal sheet sample to the roller surface of the target roller shaft;

[0012] The roller gap of the target roller is controlled to be adjusted from the installation gap to the thickness value of the metal sheet sample, so that the target roller and the metal sheet sample are in close contact.

[0013] In the bonded state, a force is applied to the target roller to form an indentation, and the force is released to release the roller gap and obtain an indented metal sheet sample.

[0014] Based on the indented metal sheet sample, the thickness difference at a preset position is obtained, and the deflection difference curve of the target roller is generated according to the thickness difference.

[0015] In some embodiments, determining the metal sheet thickness range based on the operating parameters of the target roller includes:

[0016] Based on the structural and force parameters of the target roller shaft, calculate the maximum deflection value of the target roller shaft under the condition of simply supported boundary at both ends;

[0017] The thickness of the metal sheet is set to twice the maximum deflection value as the lower limit, and the thickness of the metal sheet is set in combination with the actual loading conditions and material deformation characteristics.

[0018] The thickness range of the metal sheet used for indentation deformation is determined by using the lower limit and the upper limit of the thickness as boundaries.

[0019] In some embodiments, selecting a target thickness value from the thickness range and preparing a metal sheet sample includes:

[0020] Select a target thickness value that meets the requirements of structural adaptability and plastic deformation response from the thickness range;

[0021] Based on the target thickness value, the metal sheet is cut to obtain a metal sheet sample; wherein the metal sheet sample covers the width of the target roller surface.

[0022] In some embodiments, controlling the roll gap expansion of the target roller to form an installation gap and attaching the metal sheet sample to the roller surface of the target roller includes:

[0023] Control the actuator used to adjust the roll gap, and expand the roll gap of the target roller to a preset installation gap greater than the thickness of the metal sheet sample;

[0024] Within the installation gap, the metal sheet sample is attached to the roller surface of the target roller, and the position of the metal sheet sample is adjusted along the width of the roller surface so that the metal sheet sample covers the area to be pressed on the roller surface.

[0025] In some embodiments, controlling the roll gap of the target roller to be adjusted from the mounting gap to the thickness value of the metal sheet sample, so that the target roller and the metal sheet sample are in close contact, includes:

[0026] Control the actuator used to adjust the roll gap, so that the roll gap of the target roll shaft gradually decreases in the axial direction;

[0027] During the roll gap adjustment process, displacement and pressure data related to the roll gap change are collected;

[0028] Based on the displacement data and the pressure data, it is determined whether the target roller shaft forms a uniform contact with the metal sheet sample along the width direction of the roller surface;

[0029] When the contact is uniform, the roll gap retraction operation is stopped to obtain the bonding state between the metal sheet sample and the target roller.

[0030] In some embodiments, the step of applying a force to the target roller in the bonded state to form an indentation, releasing the force to release the roller gap, and obtaining an indented metal sheet sample includes:

[0031] In the bonding state, the loading device is controlled to apply an axial force to the target roller at a preset loading rate and maintain the load to the target load.

[0032] During the loading and holding period, the metal sheet sample is subjected to a force that induces a plastic indentation along the thickness direction;

[0033] After the plastic indentation is formed, the force is released and the target roller is controlled to release the roller gap, thereby obtaining a metal sheet sample with the indentation formed.

[0034] In some embodiments, obtaining the thickness difference at a preset position based on the indented metal sheet sample and generating the deflection difference curve of the target roller shaft based on the thickness difference includes:

[0035] A preset number of equidistant position points are set along the width direction of the roller surface of the indented metal sheet sample, and the indentation thickness value of each position point is obtained based on the measuring device.

[0036] Using the indentation thickness value of the edge region of the indented metal sheet sample as the reference thickness, the thickness difference of each location point relative to the reference thickness is calculated and converted into a deflection difference value.

[0037] A deflection difference curve representing the deflection distribution of the target roller shaft is generated based on the deflection difference value and position coordinates of each location point.

[0038] Secondly, embodiments of this application provide a roller deflection testing system, comprising:

[0039] The thickness acquisition module is used to determine the thickness range of the metal sheet based on the operating parameters of the target roller.

[0040] A sample preparation module is used to select a target thickness value from the thickness range and prepare a metal sheet sample;

[0041] An attachment module is used to control the expansion of the roll gap of the target roller shaft to form an installation gap, and to attach the metal sheet sample to the roller surface of the target roller shaft;

[0042] The roller gap adjustment module is used to control the roller gap of the target roller shaft to be adjusted back from the installation gap to the thickness value of the metal sheet sample, so that the target roller shaft and the metal sheet sample are in close contact.

[0043] The sample acquisition module is used to apply a force to the target roller shaft in the bonding state to form an indentation, release the force to release the roller gap, and acquire the indented metal sheet sample.

[0044] The curve acquisition module is used to acquire the thickness difference at a preset position based on the indented metal sheet sample, and generate the deflection difference curve of the target roller shaft based on the thickness difference.

[0045] Thirdly, embodiments of this application provide a roller pressing device, which includes a processor and a memory. The memory stores a computer program, and the processor executes the computer program to implement the roller deflection testing method of the first aspect described above.

[0046] Fourthly, embodiments of this application provide a computer-readable storage medium, wherein when the computer program is executed on a processor, it implements the roller deflection testing method of the first aspect described above.

[0047] The embodiments of this application have the following beneficial effects: The roller deflection testing method provided by this application determines the thickness range of the metal sheet from the working condition parameters, selects the appropriate thickness and prepares the sample, and then adjusts the roller gap in stages to achieve the additional load. Finally, it calculates the deflection difference at a preset number of positions based on the change of indentation thickness and plots the deflection difference curve. It can not only truly reflect the deformation distribution of the target roller under standard working conditions, but also has significant advantages such as simple structure, stable measurement, low cost and strong adaptability. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 A flowchart of a roller deflection testing method according to an embodiment of this application is shown;

[0050] Figure 2 A schematic diagram of the applied force in the roller deflection test method of this application is shown;

[0051] Figure 3 This diagram illustrates a flat metal sheet in the roller deflection testing method according to an embodiment of this application.

[0052] Figure 4 This diagram illustrates the shape of the metal sheet when it undergoes deflection deformation in the roller deflection test method according to an embodiment of this application.

[0053] Figure 5 This paper shows a schematic diagram of the deflection difference curve generated in the roller deflection testing method of the present application embodiment;

[0054] Figure 6 A schematic diagram of a roller deflection testing system according to an embodiment of this application is shown. Detailed Implementation

[0055] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0056] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0057] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0058] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0059] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0060] Considering the common problems of high equipment cost, poor adaptability to working conditions, or inability to measure the actual deflection difference in the rolling area in existing roller deflection measurement schemes, a roller deflection testing method is proposed. This method determines the thickness range of a metal sheet by using the working parameters of the target roller, and prepares a metal sheet sample from the target thickness value within this range. The roller gap of the target roller is controlled to expand, forming an installation gap. The metal sheet sample is then attached to the roller surface of the target roller. The roller gap is controlled to retract from the installation gap to the thickness value of the metal sheet sample, bringing the target roller and the metal sheet sample into close contact. A force is applied to the target roller in this contact state to form an indentation. The force is then released, releasing the roller gap, obtaining the indented metal sheet sample and its thickness difference. The deflection difference is calculated based on the thickness difference, thus generating the deflection difference curve of the target roller. This method directly quantifies the actual deflection response within the rolling area, improving the reliability and applicability of roller deformation identification.

[0061] The following describes the roller deflection test method using specific examples.

[0062] Figure 1 A flowchart of a roller deflection testing method according to an embodiment of this application is shown. Exemplarily, the roller deflection testing method includes the following steps:

[0063] Step S100: Determine the metal sheet thickness range based on the operating parameters of the target roller.

[0064] Among them, the operating parameters refer to the set of physical parameters used to describe the geometric characteristics and load conditions of the target roller in a specific usage scenario, including but not limited to roller width, roller diameter, span, support method, and the magnitude and location of the applied load.

[0065] Specifically, structural measurements and load analyses are performed on the target roller to obtain its structural dimensions and stress data under working conditions. These parameters are then used for deformation calculations, providing a basis for subsequent thickness design and determining the initial design range for the metal sheet thickness.

[0066] In an optional embodiment, step S100 includes the following sub-steps:

[0067] Step S101: Based on the structural parameters and force parameters of the target roller shaft, calculate the maximum deflection value of the target roller shaft under the condition of simply supported boundary at both ends.

[0068] The structural parameters include the roller length *l*, roller diameter *d*, and material elastic modulus *E*. The force parameter refers to the resultant force *F* applied by the hydraulic cylinder under the test conditions. The simply supported boundary condition defines the boundary constraint method of the metal plate's force; that is, the metal sheet is placed under the upper and lower rollers, with its ends in a state of no rotational constraint but capable of withstanding vertical reaction forces. Therefore, under loading conditions, its deflection deformation can be approximated as the force response of a simply supported beam or plate. Under the simply supported boundary condition, the maximum deflection... The calculation formula is as follows:

[0069]

[0070] in Let be the moment of inertia of the roller surface. ;

[0071] For example, assuming the roller length is 500mm, the diameter is 200mm, and the applied load is 20t, the maximum deflection value under this working condition can be obtained by substituting into the above formula. It is worth noting that the "maximum deflection value" mentioned in this embodiment refers to the calculated maximum deflection value under the condition where the fixed boundary is more relaxed. It is a relatively conservative maximum deflection value to ensure that the theoretical value under actual working conditions does not exceed this maximum deflection value.

[0072] In step S102, twice the maximum deflection value is set as the lower limit of the thickness of the metal sheet, and the upper limit of the thickness of the metal sheet is set in combination with the actual loading conditions and material deformation characteristics.

[0073] The lower limit of the metal sheet thickness refers to the minimum thickness value set to ensure effective indentation formation. This is to avoid measurement errors or insignificant response signals due to insufficient deformation of the metal sheet after loading. Theoretically, the metal sheet thickness is set to the maximum deflection value. Twice the value can meet the indentation response requirements, but to improve deformation stability and signal strength, the lower limit is often set to 4× in practice. Meanwhile, process constraints such as a maximum thickness not exceeding 1mm are also taken into account.

[0074] Specifically, based on the maximum deflection value of the target roller shaft under simply supported boundary conditions. First, set a lower limit for thickness. As a theoretical reference, the deformation range and stability of the metal sheet during loading are evaluated by combining specific loading conditions (such as the magnitude of the applied force and the duration of application) and material property parameters (such as yield stress and elongation). For example, if the applied force is large or the loading time is long, the excessively thick metal sheet may overflow to the edges after being compressed, expanding the compressed area and causing measurement errors. Therefore, to balance measurement accuracy and structural safety, a maximum thickness is set. Set within the range of 0.4mm-1.0mm.

[0075] For example, when When the thickness is 0.1 mm, the theoretical lower limit is: =0.2mm, and considering loading adaptability, the recommended range is 0.4mm-1.0mm.

[0076] Step S103: Determine the thickness range of the metal sheet used for indentation deformation, using the lower and upper thickness limits as boundaries.

[0077] The thickness range of the metal sheet refers to the range of thickness values ​​within the indentation response range that are both feasible to process and measurable, and is defined as the lower limit. and upper limit The closed interval between.

[0078] Specifically, the thickness range is set as t∈[tmin,tmax]. For example, 0.3mm-1.0mm is used as the basis for selecting the thickness of the subsequent metal sheet samples. Specific thickness values ​​are selected within this range for sample preparation to ensure that a clear and measurable indentation response can be formed during the subsequent loading process.

[0079] Step S200: Select the target thickness value from the thickness range and prepare a metal sheet sample.

[0080] The target thickness value refers to the specific thickness value selected for processing the metal sheet sample (e.g., lead or tin) within a predefined range of metal sheet thickness. It requires comprehensive consideration of structural adaptability and deformation response sensitivity under the test scenario. The target thickness value not only affects the clarity and measurement accuracy of the indentation but also directly relates to whether quantifiable deformation meeting identification requirements can be generated within a reasonable load range.

[0081] Specifically, a set of thickness values ​​that meet the test requirements is first selected from a thickness range (e.g., 0.3mm~1.0mm). After selection, a sample sheet (lead or tin) is processed and prepared based on the thickness value so that it can be subsequently installed on the roller surface of the target roller and participate in the deflection indentation test process.

[0082] In an optional embodiment, step S200 includes the following sub-steps:

[0083] Step S201: Select a target thickness value from the thickness range that meets the requirements of structural adaptability and plastic deformation response.

[0084] Among them, structural adaptability refers to the physical structure of the selected metal sheet thickness being able to adhere to the roller surface of the target roller shaft and maintain good flatness and stability before and after loading; plastic deformation response requirement refers to the ability of the sheet of this thickness to produce clear and quantifiable indentations under a specific force without cracking, excessive yielding or measurement deviation.

[0085] As an example, indentation pre-experiments were conducted on sheets of different thicknesses, taking into account the roller dimensions, tolerance range, and maximum force of the loading cylinder, and a target thickness value of 0.6 mm was finally selected. This value can produce effective plastic deformation under a load of less than 20 t, while the thickness does not exceed the limit and it has good compatibility with the roll gap structure.

[0086] Step S202: Based on the target thickness value, cut the metal sheet to obtain a metal sheet sample; wherein the metal sheet sample covers the width of the target roller surface.

[0087] The metal sheet sample refers to a soft metal sheet processed to the target thickness value, capable of being indented, used for subsequent attachment to the roller surface and forming an indented area that can be measured after loading. Its coverage area should be consistent with the width of the target roller surface to ensure that identifiable deflection response data can be obtained throughout the entire effective working area.

[0088] Specifically, based on the target thickness value, such as 0.6mm, a transverse cut is made from an aluminum alloy sheet of uniform specifications. The width is equal to the effective working roller surface width of the target roller (e.g., 750mm), and the length direction is consistent with the roller axis. The resulting metal sheet sample has smooth edges, precise dimensions, and can adhere to the roller surface and withstand the local pressure generated during subsequent loading processes.

[0089] Step S300: Control the expansion of the roll gap of the target roller shaft to form an installation gap, and attach the metal sheet sample to the roller surface of the target roller shaft.

[0090] The roll gap refers to the linear contact gap formed between the upper and lower rolls. Its width is usually controlled by the roll gap adjustment mechanism. Adjusting the roll gap allows materials of different thicknesses to pass through or be pressed together. The installation gap is a specific distance greater than the thickness of the metal sheet sample, ensuring that the metal sheet sample is not prematurely compressed during installation, facilitating its smooth placement and position adjustment.

[0091] Specifically, the roll gap adjustment logic is executed to put the target roller in an open state, creating a gap that meets the installation requirements. Then, the operator or robot slowly inserts a pre-cut metal sheet sample into this roll gap section and attaches it to the surface of the target roller. This process ensures the metal sheet sample is completely flattened, free of air bubbles or structural warping, laying the physical foundation for subsequent loading and indentation processes.

[0092] In an optional embodiment, step S300 includes the following sub-steps:

[0093] Step S301: Control the actuator used to adjust the roll gap to expand the roll gap of the target roller to a preset installation gap greater than the thickness of the metal sheet sample.

[0094] The actuator refers to the drive unit connected to the upper and lower rollers or their support devices, typically including hydraulic cylinders, lead screws, electric servo systems, etc., and its function is to precisely control the roller gap. The preset installation gap is an operating margin range based on the thickness of the metal sheet sample, used to ensure the safety and smoothness of the installation process; to further improve operational tolerance and assembly stability, this gap is set to the thickness of the metal sheet sample plus 1 mm to 2 mm.

[0095] As an example, if the thickness of the metal sheet sample is 0.6 mm, the gap between the upper and lower rollers should be expanded to a range of 1.6 mm ± 0.2 mm (i.e., 0.6 mm + 1~2 mm) to ensure safe placement of the sheet while preventing positioning misalignment or sheet slippage due to excessive gap. In this state, the roller surface is in a ready-to-assemble state, and subsequent bonding operations can proceed.

[0096] In step S302, within the installation gap, the metal sheet sample is attached to the roller surface of the target roller shaft, and the position of the metal sheet sample is adjusted along the width of the roller surface so that the metal sheet sample covers the area to be pressed on the roller surface.

[0097] In this context, "attachment" refers to the process of ensuring that the metal sheet sample and the roller surface are in surface contact before any force is applied, guaranteeing that no displacement or wrinkling occurs before loading. The "pressure area" refers to the designated effective area on the target roller for forming indentations, typically covering the central or symmetrical section of the roller surface, used to reflect typical deflection response.

[0098] Specifically, within the expanded installation gap, insert the metal sheet sample along the direction of the roller surface. Using a limiting device or marking line as a reference, adjust the position of the metal sheet along the width direction of the roller surface so that its left and right edges are aligned with the edge of the roller surface, and the central area covers the position to be pressed.

[0099] In step S400, the roller gap of the target roller is controlled to be adjusted back from the installation gap to the thickness value of the metal sheet sample, so that the target roller and the metal sheet sample are in close contact.

[0100] Here, "roll gap" refers to the clearance between two rollers, and "installation gap" is the width of the roll gap after it has been expanded to facilitate the embedding of the metal sample. "Reset" refers to the process of gradually adjusting the roll gap from its original expanded state to a set target value, specifically manifested as a gradual reduction in the gap between the upper and lower rollers. "Close contact" refers to the uniform physical contact formed across the entire width of the moving roller surface and the metal sample covering the stationary roller without the application of external force.

[0101] Specifically, the control actuator drives the hydraulic cylinder to move synchronously towards the fixed roller, causing the roller gap to gradually shrink from the installation gap to the thickness value of the metal sheet sample (e.g., 0.8 mm). During this process, the current roller gap size is monitored in real time by displacement sensors installed inside or outside the hydraulic cylinder to ensure that the roller gap reduction accuracy meets the thickness tolerance requirements.

[0102] Furthermore, by combining the displacement data fed back by the sensors and the real-time changes in the applied force, it can be determined whether a uniform contact has been formed between the target roller and the metal sheet sample in the width direction of the roller surface. When the pressure distribution in the contact area tends to stabilize, or the narrowing trend of the roller gap slows down significantly, it can be determined that the bonding state has been established, and the roller gap retraction operation is terminated.

[0103] In an optional embodiment, step S400 includes the following sub-steps:

[0104] Step S401: Control the actuator used to adjust the roll gap so that the roll gap of the target roll shaft gradually decreases in the axial direction.

[0105] The axial direction refers to the geometric coordinate direction perpendicular to the material rolling direction and extending along the width of the roll surface. By precisely driving the roll surface adjustment device through an actuator (such as a hydraulic device or an electric servo unit), the distance between the upper and lower rolls can be adjusted synchronously at multiple points or gradually in sections along the axial direction.

[0106] In detail, based on the callback target value set during initialization, the callback rate and range are set at certain intervals for each axial position to ensure that the roll gap maintains an approximately consistent shrinkage rhythm across the entire axial width, thereby preventing fit imbalance caused by local deformation or mechanical tolerances.

[0107] Step S402: During the roll gap adjustment process, collect displacement data and pressure data related to the roll gap change.

[0108] The displacement data represents the retraction stroke of the actuator at each axial position, while the pressure data represents the unit contact load applied to the metal sheet sample by the upper and lower rollers during the retraction process. Both serve as status feedback parameters to determine whether the roll gap has reached the bonding threshold.

[0109] Specifically, the sensor array is arranged at multiple points along the axial direction to synchronously record the change in roll gap and contact response force, and feeds this data back to the control system in real time. The control system combines the data curves from each measuring point to analyze the contact trend and bonding uniformity, in order to help determine whether to continue the pullback.

[0110] Step S403: Based on displacement data and pressure data, determine whether the target roller shaft forms uniform contact with the metal sheet sample along the width direction of the roller surface.

[0111] Uniform contact refers to the situation where, at each axial detection point, the displacement change converges to the target value, and the unit pressure fluctuation is less than the preset error tolerance. Judgment criteria may include the maximum pressure difference, average bonding stress, and the edge-to-center pressure deviation ratio.

[0112] As an example, when the pressure value fluctuation of all measuring points is less than ±5% and the displacement converges to within ±0.02 mm of the target thickness, the contact is considered uniform, and the subsequent judgment and action logic are entered, thereby improving the symmetry and stability of the indentation generation.

[0113] Step S404: When the contact is uniform, stop the roll gap reversal operation to obtain the bonding state between the metal sheet sample and the target roller.

[0114] The "fitting state" refers to the condition where all axial points meet the fitting criteria and the roll gap remains unchanged. This state serves as a prerequisite for the indentation loading action and can significantly improve the integrity and linearity of the indentation forming process.

[0115] Specifically, after identifying the uniform contact state, the position of the actuator is immediately locked by the control signal to keep the roll gap stable, and the state is marked as the indentation trigger point.

[0116] Step S500: Apply force to the target roller in the bonding state to form an indentation, release the force to release the roller gap, and obtain an indented metal sheet sample.

[0117] The force refers to the axial resultant force applied to the target roller shaft by the bearing seat at the journal of the moving roller through the loading device, which is used to cause the metal sheet sample to undergo plastic deformation and form a measurable indentation; the release roller gap refers to restoring the gap between the upper and lower rollers after the indentation is formed so that the metal sheet sample can be taken out.

[0118] By way of example, the loading device applies force slowly to the target working load (e.g., 80 kN) at a preset rate (e.g., 5 kN / s) through the hydraulic cylinder and its PID closed-loop control system, maintains it for about 10 seconds and then slowly unloads it, while simultaneously opening the roll gap, thereby safely removing the extruded metal sheet sample.

[0119] In an optional embodiment, step S500 includes the following sub-steps:

[0120] In step S501, under the bonding state, the loading device is controlled to apply an axial force to the target roller at a preset loading rate and maintain the load to the target load.

[0121] The loading device is a combination of a hydraulic cylinder and a PID control unit, which can monitor and apply pressure in real time and in a steady state. The preset loading rate refers to the load increment per unit time, which is used to ensure uniform force and linear traceability of deformation during the indentation process.

[0122] like Figure 2 As shown, during loading, the bearing seats at both ends of the fixed roller remain stationary, maintaining a stable support state; the moving roller is mounted on a floating structure, and its bearing seats at both ends can float in the X direction while being controlled to move in the Z direction. A soft metal sheet sample is placed between the moving roller and the fixed roller, covering the area in the width direction (Y-axis) of the roller surface. The hydraulic cylinder acts on the bearing seats at both ends of the moving roller to achieve axial loading in the Z-axis direction, thereby forming the moving roller pressing the metal sheet.

[0123] For example, if the target load is 20 t (≈196 kN), the hydraulic cylinder PID system will set the loading rate to 5 kN / s, and use sensor feedback to make the load rise steadily to 196 kN and maintain it for 10 s, so as to avoid sheet breakage or edge overflow caused by impact loading.

[0124] Step S502: During the loading and holding period, the metal sheet sample is subjected to a force to generate a plastic indentation along the thickness direction.

[0125] Plastic indentation refers to the indentation region formed when a metal sheet sample exceeds its elastic limit under axial load, resulting in irreversible deformation. The thickness variation of this region can be used to characterize the deflection response at different positions of the target roller. The indentation morphology is determined by the stress distribution, sheet thickness, and material yield strength.

[0126] Specifically, after the loading process is completed, under the maintained load, the metal sheet sample forms plastic indentations of varying degrees at each contact point, exhibiting permanent compressive deformation along the thickness direction. Since the target roller exhibits nonlinear deflection under loading conditions, this deflection is spatially mapped and recorded through the thickness differences of the metal sheet sample.

[0127] Step S503: After forming the plastic indentation, release the applied force and control the target roller to release the roller gap, and obtain the metal sheet sample with the indentation formed.

[0128] Among them, "releasing the force" refers to the system controlling the loading device to unload, so that the target roller shaft no longer bears the external load, and "releasing the roller gap" refers to the gap between the upper and lower rollers returning from the compressed state to the separated state, which facilitates the safe extraction of metal sheet samples.

[0129] Specifically, after the metal sheet sample is indented, the control system sends an unloading signal, the loading device returns sequentially, and at the same time drives the actuator to reopen the roller gap to the release state. At this time, the metal sheet sample can be peeled off from the target roller due to the absence of external force constraint, forming a sample with plastic indentation.

[0130] Step S600: Obtain the thickness difference at a preset position based on the indented metal sheet sample, and generate the deflection difference curve of the target roller shaft based on the thickness difference.

[0131] The deflection difference curve refers to the deformation distribution curve of the target roller shaft under loading, calculated based on the thickness variation at different locations in the indented metal sheet sample. It is used to quantitatively characterize the amplitude and trend of roller shaft deflection. This curve reflects the non-uniformity of stiffness or asymmetry of force on the target roller shaft under actual working load.

[0132] As an example, to achieve this curve generation process, the thickness of the obtained indented metal sheet sample is measured at multiple points. By comparing the differences in indentation depth at each location, the corresponding local deflection change is calculated. Finally, all deflection changes are fitted into a continuous function or a discrete point sequence to form a complete deflection difference curve.

[0133] In an optional embodiment, step S600 includes the following sub-steps:

[0134] Step S601: Set a preset number of equidistant position points along the width direction of the roller surface of the indented metal sheet sample, and obtain the indentation thickness value of each position point based on the measuring device.

[0135] Among them, the position points refer to a number of fixed coordinate positions set along the width direction on the indented metal sheet sample, which are used for discretized thickness measurement; the measuring device can be a high-precision micrometer (with a cone), a coordinate measuring machine, a laser scanning thickness gauge or an ultrasonic thickness gauge, etc., to meet different accuracy requirements.

[0136] As an example, the indented metal sheet sample is placed flat on the measuring platform, and multiple measuring points are arranged at fixed intervals (e.g., one point every 20 mm) in the area of ​​width L, and numbered sequentially. At each location point, three consecutive measurements are taken using a micrometer with a tapered tip, and the average value is calculated to obtain the thickness t1, t2...tn at that point. This thickness data directly reflects the deflection deformation of the target roller at the corresponding location.

[0137] Step S602: Using the indentation thickness value of the edge region of the indented metal sheet sample as the reference thickness, calculate the thickness difference of each location point relative to the reference thickness and convert it into a deflection difference value.

[0138] The reference thickness is the thickness of the indented metal sheet sample in the edge region. This region typically corresponds to the edge section of the roller shaft, which is less affected by deflection deformation, resulting in a deeper indentation and therefore a thinner thickness; it can be considered a reference point. For example... Figure 3 As shown, when no load is applied, the metal sheet has a uniform thickness; while... Figure 4 As shown, the rectangular box represents the state of the deformed metal sheet before it is compressed, with a thickness of t0 on all sides. The dashed box represents the state after the roller has pressed it. After pressing, the thickness of the metal sheet decreases on all sides, with the ends (left and right) becoming thinner even more. That is, the thickness t1 in the middle is greater than the thickness t2 at the ends. In other words, its transverse thickness surface exhibits a contour feature of "protrusion in the middle and concavity at the edges," indicating that the middle region has a relatively larger thickness due to the greater deflection of the roller and a shallower indentation.

[0139] Specifically, let the thickness at the central measuring point be t1, and the reference thickness at the edge be t2, then the maximum deflection deformation in this region is... It can be represented as:

[0140]

[0141] For any point Pi, whose actual measured thickness is t, its deflection difference w can be calculated using the following formula:

[0142]

[0143] Where t is the thickness measurement value at location point Pi. The edge reference thickness is given by w, which represents the deflection response at that location.

[0144] Step S603: Generate a deflection difference curve representing the deflection distribution of the target roller shaft based on the deflection difference value and position coordinates of each position point.

[0145] The deflection difference curve is a two-dimensional function graph formed by combining the lateral coordinates of each measurement point on the indented metal sheet sample with the corresponding deflection difference value. It is used to reflect the deflection distribution of the target roller shaft along the width direction of the roller surface under loading.

[0146] Specifically, the deflection difference value w is paired with the lateral coordinate x of the point on the metal sample to form a point set. A continuous deflection difference distribution curve is then plotted using fitting or interpolation methods, such as polynomial curve fitting or sample interpolation.

[0147] like Figure 5 As shown in the figure, the changes of the indented metal sheet before (thickness t0) and after (thickness t) are illustrated, as well as the relationship curve between the thickness difference and the deflection difference constructed by the thickness t1 in the middle and the thickness t2 at the edge.

[0148] Where: X-axis (length along the path L): indicates the lateral position of the metal sheet, from one end (0) to the other end (L), with L / 2 as the center, representing the strongest point of force in the middle, usually the point of maximum deformation, corresponding to the maximum thickness difference and the maximum deflection difference;

[0149] Y-axis (thickness): Represents the actual thickness or derived deflection value of the indented metal sheet at different lateral positions;

[0150] t0 represents the overall thickness before the force is applied;

[0151] t1 is the thickness at the middle measuring point, the reference thickness;

[0152] t2 is the thickness of the middle section after being subjected to force;

[0153] t1 t2 is the thickness difference relative to the end;

[0154] (t1 t 2) / 2 represents the difference in deflection relative to the end;

[0155] That is (t1) The deflection difference distribution curve of the target roller shaft (t 2) / 2 shows a trend of bulging in the middle and flattening at both ends, consistent with the typical deflection behavior constrained by a simply supported boundary. This figure not only vividly illustrates the calculation basis of the deflection difference curve but also demonstrates the physical mapping process from indentation thickness measurement to structural deformation quantification. In other words, the graph allows for intuitive judgment of the deflection distribution trend, the location of maximum deflection, and local abnormal areas, providing a basis for roller shaft condition assessment, parameter adjustment, and equipment maintenance.

[0156] Figure 6 A schematic diagram of a roller deflection testing system according to an embodiment of this application is shown. Exemplarily, the roller deflection testing system 100 includes:

[0157] Thickness acquisition module 110 is used to determine the thickness range of the metal sheet based on the working parameters of the target roller.

[0158] The sample preparation module 120 is used to select a target thickness value from the thickness range and prepare a metal sheet sample;

[0159] The attachment module 130 is used to control the expansion of the roll gap of the target roller shaft to form an installation gap, and to attach the metal sheet sample to the roller surface of the target roller shaft.

[0160] The roller gap adjustment module 140 is used to control the roller gap of the target roller shaft to be adjusted back from the installation gap to the thickness value of the metal sheet sample, so that the target roller shaft and the metal sheet sample are in close contact.

[0161] The sample acquisition module 150 is used to apply a force to the target roller shaft in the bonding state to form an indentation, release the force to release the roller gap, and acquire an indented metal sheet sample.

[0162] The curve acquisition module 160 is used to acquire the thickness difference at a preset position based on the indented metal sheet sample, and generate the deflection difference curve of the target roller shaft according to the thickness difference.

[0163] It is understood that the apparatus of this embodiment corresponds to the method of the above embodiments, and the options in the above embodiments are also applicable to this embodiment, so they will not be described again here.

[0164] This application also provides a rolling mill apparatus, exemplary of which includes a processor and a memory, wherein the memory stores a computer program, and the processor, by running the computer program, causes the rolling mill apparatus to perform the functions of the various modules in the above-described method or apparatus.

[0165] The processor can be an integrated circuit chip with signal processing capabilities. The processor can be a general-purpose processor, including at least one of a Central Processing Unit (CPU), Graphics Processing Unit (GPU), Network Processor (NP), Digital Signal Processor (DSP), Application-Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application.

[0166] The memory can be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc. The memory is used to store computer programs, and the processor can execute the computer programs accordingly after receiving execution instructions.

[0167] This application also provides a computer-readable storage medium for storing the computer program used in the aforementioned device. For example, the computer-readable storage medium may include, but is not limited to, various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0168] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that, in alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0169] In addition, the functional modules or units in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0170] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a smartphone, personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0171] The above description is merely a specific embodiment of this application, but the scope of protection of this application 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 this application should be included within the scope of protection of this application.

Claims

1. A roll axis deflection testing method characterized by, The method includes: The thickness range of the metal sheet is determined based on the operating parameters of the target roller. Select a target thickness value from the thickness range and prepare a metal sheet sample; Control the expansion of the roll gap of the target roller shaft to form an installation gap, and attach the metal sheet sample to the roller surface of the target roller shaft; The roller gap of the target roller is controlled to be adjusted from the installation gap to the thickness value of the metal sheet sample, so that the target roller and the metal sheet sample are in close contact. In the bonded state, a force is applied to the target roller to form an indentation, and the force is released to release the roller gap and obtain an indented metal sheet sample. Based on the indented metal sheet sample, the thickness difference at a preset position is obtained, and the deflection difference curve of the target roller is generated according to the thickness difference.

2. The roll axis deflection testing method of claim 1, wherein, The step of determining the metal sheet thickness range based on the operating parameters of the target roller includes: Based on the structural and force parameters of the target roller shaft, calculate the maximum deflection value of the target roller shaft under the condition of simply supported boundary at both ends; The thickness of the metal sheet is set to twice the maximum deflection value as the lower limit, and the thickness of the metal sheet is set in combination with the actual loading conditions and material deformation characteristics. The thickness range of the metal sheet used for indentation deformation is determined by using the lower limit and the upper limit of the thickness as boundaries.

3. The roller deflection testing method according to claim 1, characterized in that, The step of selecting a target thickness value from the thickness range and preparing a metal sheet sample includes: Select a target thickness value that meets the requirements of structural adaptability and plastic deformation response from the thickness range; Based on the target thickness value, the metal sheet is cut to obtain a metal sheet sample; wherein the metal sheet sample covers the width of the target roller surface.

4. The roller deflection testing method according to claim 3, characterized in that, The process of controlling the expansion of the roll gap of the target roller to form an installation gap and attaching the metal sheet sample to the roller surface of the target roller includes: Control the actuator used to adjust the roll gap, and expand the roll gap of the target roller to a preset installation gap greater than the thickness of the metal sheet sample; Within the installation gap, the metal sheet sample is attached to the roller surface of the target roller, and the position of the metal sheet sample is adjusted along the width of the roller surface so that the metal sheet sample covers the area to be pressed on the roller surface.

5. The roller deflection testing method according to claim 1, characterized in that, The control of the roll gap of the target roller shaft to be adjusted from the installation gap to the thickness value of the metal sheet sample, so that the target roller shaft and the metal sheet sample are in close contact, includes: Control the actuator used to adjust the roll gap, so that the roll gap of the target roll shaft gradually decreases in the axial direction; During the roll gap adjustment process, displacement and pressure data related to the roll gap change are collected; Based on the displacement data and the pressure data, it is determined whether the target roller shaft forms a uniform contact with the metal sheet sample along the width direction of the roller surface; When the contact is uniform, the roll gap retraction operation is stopped to obtain the bonding state between the metal sheet sample and the target roller.

6. The roller deflection testing method according to claim 1, characterized in that, The process of applying a force to the target roller in the bonded state to form an indentation, releasing the force to release the roller gap, and obtaining an indented metal sheet sample includes: In the bonding state, the loading device is controlled to apply an axial force to the target roller at a preset loading rate and maintain the load to the target load. During the loading and holding period, the metal sheet sample is subjected to a force that induces a plastic indentation along the thickness direction; After the plastic indentation is formed, the force is released and the target roller is controlled to release the roller gap, thereby obtaining a metal sheet sample with the indentation formed.

7. The roller deflection testing method according to claim 1, characterized in that, The step of obtaining the thickness difference value at a preset position based on the indented metal sheet sample, and generating the deflection difference curve of the target roller shaft based on the thickness difference value, includes: A preset number of equidistant position points are set along the width direction of the roller surface of the indented metal sheet sample, and the indentation thickness value of each position point is obtained based on the measuring device. Using the indentation thickness value of the edge region of the indented metal sheet sample as the reference thickness, the thickness difference of each location point relative to the reference thickness is calculated and converted into a deflection difference value. A deflection difference curve representing the deflection distribution of the target roller shaft is generated based on the deflection difference value and position coordinates of each location point.

8. A roller deflection testing system, characterized in that, include: The thickness acquisition module is used to determine the thickness range of the metal sheet based on the operating parameters of the target roller. A sample preparation module is used to select a target thickness value from the thickness range and prepare a metal sheet sample; An attachment module is used to control the expansion of the roll gap of the target roller shaft to form an installation gap, and to attach the metal sheet sample to the roller surface of the target roller shaft; The roller gap adjustment module is used to control the roller gap of the target roller shaft to be adjusted back from the installation gap to the thickness value of the metal sheet sample, so that the target roller shaft and the metal sheet sample are in close contact. The sample acquisition module is used to apply a force to the target roller shaft in the bonding state to form an indentation, release the force to release the roller gap, and acquire the indented metal sheet sample. The curve acquisition module is used to acquire the thickness difference at a preset position based on the indented metal sheet sample, and generate the deflection difference curve of the target roller shaft based on the thickness difference.

9. A roller pressing device, characterized in that, The roller pressing device includes a processor and a memory, the memory storing a computer program, and the processor executing the computer program to implement the roller deflection testing method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, It stores a computer program, which, when executed on a processor, implements the roller deflection test method according to any one of claims 1-7.

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