Sheet metal sensitivity evaluation method and device, equipment, storage medium and product

Abstract

The invention provides a metal plate sensitivity evaluation method and device, equipment, a storage medium and a product. The method comprises the steps that according to a plurality of different machining parameters, a target metal plate is machined, and punched round holes corresponding to the machining parameters are punched in the target metal plate; the section of each punched round hole is measured, and different partition thicknesses of the section corresponding to each punched round hole are determined; broaching is conducted on all the punched round holes, and the broaching rate corresponding to all the punched round holes is determined; and according to the different partition thicknesses and the hole expansion rates corresponding to the punched round holes, sensitivity curve fitting is carried out, and sensitivity evaluation of the target metal plate is determined.

Description

Technical Field

[0001] The present application relates to the field of metal processing technology, and in particular to a metal sheet sensitivity evaluation method, device, equipment, storage medium and product. Background Art

[0002] Metal sheets are widely used in industrial production. However, during the processing of blanking, stamping, and hole expansion, the edges of metal sheets are prone to cracking, which seriously affects product performance and production efficiency. This is mainly due to the presence of microstructural inhomogeneities such as mixed crystals, banded structures, inclusions, and segregation in the thickness direction of metal sheets. Even if the strength and elongation are the same, the processing performance of different materials may vary significantly. In addition, the quality of the sheared edge is affected by process parameters such as tools and shearing speed. Poor-quality sheared edges will significantly increase the risk of cracking during subsequent hole expansion or flanging.

[0003] In the prior art, the sensitivity of materials to shear quality is evaluated by only using the hole expansion rate under a single shearing condition. The performance differences of materials under different shearing qualities cannot be quantified. Material selection and process parameter adjustment rely on experience, making it difficult to accurately evaluate the sensitivity of metal sheet shearing quality. Summary of the invention

[0004] The embodiments of the present application provide a metal sheet sensitivity evaluation method, device, equipment, storage medium and product, which can accurately evaluate the sensitivity of the shearing quality of the metal sheet.

[0005] In a first aspect, the present application provides a metal sheet sensitivity evaluation method, the method comprising:

[0006] According to a plurality of different processing parameters, the target metal sheet is processed respectively, and a punched circular hole corresponding to the processing parameters is punched on the target metal sheet;

[0007] Measuring the cross section of each punched circular hole to determine the thickness of different partitions of the cross section corresponding to each punched circular hole;

[0008] Expanding each of the punched circular holes to determine the corresponding expansion ratio of each of the punched circular holes;

[0009] According to the different partition thicknesses and hole expansion rates corresponding to the punched circular holes, a sensitivity curve fitting is performed to determine the sensitivity evaluation of the target metal sheet.

[0010] In some possible implementations, measuring the cross-section of each punched circular hole to determine the thickness of different partitions of the cross-section corresponding to each punched circular hole includes:

[0011] According to the shape of the cross section of each punched circular hole, the position of the fillet area, the position of the shearing area and the position of the tearing area of ​​the cross section corresponding to each punched circular hole are determined;

[0012] The thickness of the fillet area, the thickness of the shear area and the thickness of the tearing area are measured to obtain the thickness of different partitions of the cross section corresponding to each of the punched circular holes.

[0013] In some possible implementations, the rounded corner area corresponds to the edge of the punched circular hole, a circular arc transition area with a smooth surface, the shear zone corresponds to a flat area without obvious cracks formed by shearing in the punched circular hole, and the tear zone corresponds to a rough area with cracks or bumps formed by material fracture in the punched circular hole.

[0014] In some possible implementations, performing sensitivity curve fitting according to different partition thicknesses and hole expansion rates corresponding to the punched circular holes to determine the sensitivity evaluation of the target metal sheet includes:

[0015] Calculate the ratio of the sum of the thickness of the fillet area and the thickness of the shear area to the thickness of the tearing area to obtain a partition thickness ratio;

[0016] According to the partition thickness ratio and hole expansion rate corresponding to each of the punched circular holes, a sensitivity curve is fitted to obtain a sensitivity curve;

[0017] The sensitivity evaluation of the target metal sheet is determined according to the slope of the sensitivity curve.

[0018] In some possible implementations, after calculating the ratio of the sum of the thickness of the fillet area and the thickness of the shear area to the thickness of the tearing area to obtain the partition thickness ratio, the method further includes:

[0019] Calculate the ratio of the thickness of the fillet area, the sum of the thickness of the shear area and the tear area, and the thickness of the fillet area to obtain the fillet area ratio;

[0020] When the partition thickness ratio is not within the first numerical range, or the fillet area ratio is not within the second numerical range, the sensitivity evaluation of the target metal sheet is stopped.

[0021] In some possible implementations, the step of expanding each of the punched circular holes and determining the expansion ratio corresponding to each of the punched circular holes includes:

[0022] Using a hole enlarging die, enlarging each of the punched circular holes;

[0023] The hole expansion rate corresponding to each of the punched circular holes is determined according to the initial hole diameter of each of the punched circular holes and the final hole diameter of each of the punched circular holes after hole expansion.

[0024] In some possible implementations, the step of using a hole enlarging die to enlarge each of the punched circular holes includes:

[0025] The following operations are performed on each of the punched circular holes:

[0026] Insert the hole expansion die into the punched circular hole;

[0027] Continuously applying pressure to the hole-expanding die until cracks appear on the edge of the punched circular hole;

[0028] The diameter of the punched circular hole after the application of pressure is stopped is determined as the final diameter of the punched circular hole after expansion.

[0029] In some possible implementations, determining the hole expansion rate corresponding to each of the punched circular holes according to the initial hole diameter of each of the punched circular holes and the final hole diameter after each of the punched circular holes is expanded includes:

[0030] The following operations are performed for each of the punched circular holes:

[0031] Calculate the difference between the final hole diameter after punching and expanding the circular hole and the initial hole diameter;

[0032] According to the ratio of the difference to the initial hole diameter, the hole expansion ratio corresponding to the punched circular hole is obtained.

[0033] In a second aspect, the present application provides a metal sheet sensitivity evaluation device, the device comprising:

[0034] A processing module, used to process the target metal sheet according to a plurality of different processing parameters, and punch circular holes corresponding to the processing parameters on the target metal sheet;

[0035] A determination module, used to measure the cross section of each punched circular hole and determine the thickness of different partitions of the cross section corresponding to each punched circular hole;

[0036] The determination module is further used to expand each of the punched circular holes and determine the corresponding expansion rate of each of the punched circular holes;

[0037] The fitting module is used to perform sensitivity curve fitting according to different partition thicknesses and hole expansion rates corresponding to each of the punched circular holes, and determine the sensitivity evaluation of the target metal sheet.

[0038] In a third aspect, the present application provides a metal sheet sensitivity evaluation device, the device comprising: a processor, and a memory storing computer program instructions; the processor reads and executes the computer program instructions to implement the metal sheet sensitivity evaluation method as described above.

[0039] In a fourth aspect, the present application provides a computer-readable storage medium having computer program instructions stored thereon, and when the computer program instructions are executed by a processor, the metal sheet sensitivity evaluation method as described above is implemented.

[0040] In a fifth aspect, the present application provides a computer program product. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the metal sheet sensitivity evaluation method described above.

[0041] The metal sheet sensitivity evaluation method, device, equipment, storage medium and product provided in the embodiments of the present application respectively process the target metal sheet according to a plurality of different processing parameters, punch circular holes corresponding to the processing parameters on the target metal sheet, then measure the cross-section of each of the punched circular holes, determine the different partition thicknesses of the cross-section corresponding to each of the punched circular holes, then expand each of the punched circular holes, determine the expansion rate corresponding to each of the punched circular holes, and then perform sensitivity curve fitting according to the different partition thicknesses and expansion rates corresponding to each of the punched circular holes, determine the sensitivity evaluation of the target metal sheet, and use the sensitivity curve to quantify the material sensitivity to achieve accurate evaluation of the shear quality sensitivity of the metal sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present application can be better understood from the following description of the specific embodiments of the present application in conjunction with the accompanying drawings, in which:

[0043] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features.

[0044] Figure 1 is a flow chart of a metal sheet sensitivity evaluation method provided by an embodiment of the present application;

[0045] Figure 2 It is a schematic diagram of the cross-section partition of a metal sheet provided by another embodiment of the present application;

[0046] Figure 3 is a schematic diagram of a metal sheet sensitivity curve provided by an embodiment of the present application;

[0047] Figure 4It is a schematic structural diagram of a metal sheet sensitivity evaluation device provided by an embodiment of the present application;

[0048] Figure 5 It is a schematic hardware structure diagram of a metal sheet sensitivity evaluation device provided by an embodiment of the present application. Detailed implementation manners

[0049] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application.

[0050] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, elements defined by the statement "comprising..." do not exclude the presence of additional identical elements in the process, method, article or device comprising the said elements.

[0051] To solve the problems of the prior art, embodiments of the present application provide a metal sheet sensitivity evaluation method, device, equipment, storage medium and product. First, the metal sheet sensitivity evaluation method provided by the embodiments of the present application will be introduced below.

[0052] Figure 1 It shows a schematic flow diagram of a metal sheet sensitivity evaluation method provided by an embodiment of the present application. As Figure 1 shown, the method includes the following steps: S101 to S104.

[0053] S101: Process the target metal sheet according to multiple different processing parameters, and punch punching round holes corresponding to the processing parameters on the above target metal sheet.

[0054] In the specific implementation, first of all, different processing parameters need to be obtained from the user or the database. The processing parameters may include punching force, punching speed, sheet thickness, die size, working conditions of the punching machine, etc. Each set of parameters corresponds to different processing methods and punching effects. Then, according to the parameters, the target metal sheet is processed respectively to obtain the punched circular holes. The position and size of each circular hole are determined by the selected processing parameters.

[0055] S102: measuring the cross-section of each of the punched circular holes, and determining the thickness of different partitions of the cross-section corresponding to each of the punched circular holes.

[0056] In the specific implementation, for the metal sheet after punching, the detailed geometric information of the punching section is obtained. These data usually include the shape and size of the hole and its relative position to the surface and inner layer of the metal sheet. The different thicknesses of the section are usually unevenly distributed, especially when the metal is stretched or compressed during the punching process. The section is divided into several areas, and the changes in different areas are analyzed according to the thickness of each area. By analyzing the geometric features of each partition of the section, the thickness of each partition can be calculated. Image processing technology or geometric algorithms can be used to extract the boundaries of each partition and extract thickness data from it.

[0057] S103: Expand each of the punched circular holes to determine the corresponding expansion ratio of each of the punched circular holes.

[0058] In the specific implementation, after obtaining the initial size and partition thickness of the punched circular hole, the original circular hole diameter is enlarged by mechanical force, usually accompanied by metal reflow and plastic deformation. After the hole is expanded, the size change after expansion is calculated, the expansion rate of each hole is calculated, and associated with the corresponding partition thickness data, in preparation for the subsequent sensitivity curve fitting.

[0059] S104: performing sensitivity curve fitting according to different partition thicknesses and hole expansion ratios corresponding to the punched circular holes, and determining the sensitivity evaluation of the target metal sheet.

[0060] In the specific implementation, the data such as partition thickness and hole expansion rate obtained under all different processing parameters are first integrated together to form a complete database. Under each processing condition, the thickness and hole expansion rate of the circular hole are related, so these data need to be classified according to different processing parameters. The purpose of sensitivity curve fitting is to describe the relationship between partition thickness and hole expansion rate by establishing a mathematical model. Through numerical optimization algorithms such as regression analysis and least squares method, a curve is fitted to generate a sensitivity curve. According to the sensitivity curve obtained by fitting, the sensitivity evaluation of the target metal sheet is given.

[0061] The metal sheet sensitivity evaluation method provided in the embodiment of the present application processes the target metal sheet according to a plurality of different processing parameters, punches circular holes corresponding to the processing parameters on the target metal sheet, then measures the cross-section of each of the punched circular holes, determines the different partition thicknesses of the cross-section corresponding to each of the punched circular holes, then expands each of the punched circular holes, determines the expansion rate corresponding to each of the punched circular holes, and then performs sensitivity curve fitting according to the different partition thicknesses and expansion rates corresponding to each of the punched circular holes, determines the sensitivity evaluation of the target metal sheet, and utilizes the sensitivity curve to quantify the material sensitivity to achieve accurate evaluation of the shear quality sensitivity of the metal sheet.

[0062] In order to achieve accurate area division and thickness measurement, in some embodiments, the above S102 may include the following steps: S1021 to S102.

[0063] S1021: According to the shapes of the cross sections of the punched circular holes, the positions of the fillet areas, the shear areas and the tear areas of the cross sections corresponding to the punched circular holes are determined.

[0064] In the specific implementation, it is first necessary to extract the cross-sectional data of each punched circular hole, and then identify the fillet area, shear area and tear area. The fillet area usually appears at the edge of the hole, which is the area where the hole wall contacts the surface of the plate. This area is generally due to the circular tool of the punching tool, forming a smooth transition surface. The shear zone is the area where the plate starts to cut first during the punching process, and it is usually located on the inside of the fillet area. The material in this area usually shows a smoother cutting surface due to the shear force. The tear area appears on the inside of the shear area, usually due to excessive stress or the punching tool is not sharp enough during the punching process, resulting in tensile rupture of the internal structure of the metal material, forming an irregular fracture surface. Once the range of the fillet area, shear area and tear area is determined, the specific boundaries of each area are marked.

[0065] S1022: measuring the thickness of the fillet area, the thickness of the shear area and the thickness of the tear area to obtain the thickness of different partitions of the cross section corresponding to each of the punched circular holes.

[0066] In a specific implementation, the boundary information of the fillet area, the shear area and the tear area identified in the previous step is used to calculate the corresponding thickness of different partitions.

[0067] For example, the rounded corner area is usually relatively uniform, and the measurement method can be to select multiple cross sections of the rounded corner area and calculate the thickness of each slice in the area. The thickness measurement of the sheared area is more complicated because the area will present a smoother and uniform cut surface. The thickness is measured at multiple points in the sheared area, and the average thickness of the area is calculated by interpolation algorithm, or the thickness is obtained by fitting the contour of the sheared area by least squares method. Due to its irregularity, the torn area usually contains many small cracks or fracture surfaces. In order to accurately measure the thickness of the torn area, an edge detection algorithm is used to identify the sharp boundaries of the torn area and estimate the thickness of the torn area.

[0068] In addition, in order to obtain the thickness of each area more accurately, multiple measurement points will be selected in each partition for multiple measurements. Finally, the measurement results will be averaged to obtain the average thickness of each area. In irregular areas such as tear zones or shear zones, the data will be smoothed or weighted averaged to avoid the influence of abnormal data from a single measurement point on the final thickness.

[0069] The above implementation of the embodiment of the present application extracts and analyzes the cross-sectional morphology of the punched circular hole, identifies different regions and measures their thicknesses. Through a series of geometric analysis, image processing and mathematical modeling, accurate region division and thickness measurement can be achieved.

[0070] In some embodiments, the rounded corner area corresponds to the edge of the punched circular hole, a circular arc transition area with a smooth surface, the shear area corresponds to a flat area without obvious cracks formed by shearing in the punched circular hole, and the tear area corresponds to a rough area with cracks or bumps formed by material fracture in the punched circular hole.

[0071] In order to accurately determine the sensitivity of the metal sheet, in some embodiments, the above S104 may include the following steps: S1041 to S1043.

[0072] S1041: Calculate the ratio of the sum of the thickness of the rounded corner area and the thickness of the shearing area to the thickness of the tearing area to obtain a partition thickness ratio.

[0073] In a specific implementation, the thicknesses of the fillet area, shear area, and tear area have been calculated through the previous steps (such as S1021 and S1022). These thickness data are stored in structured data, such as array or matrix form, to facilitate subsequent operations. The thickness of the fillet area is added to the thickness of the shear area. The total thickness of the fillet area and the shear area is compared with the thickness of the tear area to calculate the partition thickness ratio, which represents the relationship between the total thickness of the fillet area and the shear area and the thickness of the tear area.

[0074] S1042: Perform sensitivity curve fitting according to the partition thickness ratios and hole expansion rates corresponding to the punched circular holes to obtain a sensitivity curve.

[0075] In the specific implementation, the hole expansion rate data is obtained, and then a sensitivity curve fitting model is constructed according to the partition thickness ratio and hole expansion rate corresponding to each of the punched circular holes, and the partition thickness ratio and hole expansion rate corresponding to each punched circular hole are input into the fitting algorithm as independent variables and dependent variables. After fitting, a sensitivity curve will be output to represent the relationship between the partition thickness ratio and the hole expansion rate.

[0076] S1043: Determine the sensitivity evaluation of the target metal sheet according to the slope of the sensitivity curve.

[0077] In the specific implementation, the slope of the sensitivity curve is extracted. If the slope is large, it means that the hole expansion rate is sensitive to the change of the partition thickness ratio, and the metal sheet may be more sensitive to the stress change or hole wall quality change during the processing process. According to the value of the slope, the sensitivity evaluation of the above target metal sheet is determined.

[0078] The above implementation method of the embodiment of the present application obtains the partition thickness ratio by calculating the ratio of the sum of the thickness of the above-mentioned fillet area and the thickness of the above-mentioned shear area to the thickness of the above-mentioned tearing area, and then performs sensitivity curve fitting according to the partition thickness ratio and hole expansion rate corresponding to each of the above-mentioned punched circular holes to obtain the sensitivity curve, and then determines the sensitivity evaluation of the above-mentioned target metal sheet according to the slope of the above-mentioned sensitivity curve, thereby accurately determining the sensitivity of the metal sheet.

[0079] In order to ensure that the metal sheet meets the requirements of practical applications when performing sensitivity evaluation, in some embodiments, after the above S1041, the following steps may also be included: S10411 to S1043.

[0080] S10411: Calculate the ratio of the sum of the thickness of the rounded corner area, the thickness of the shearing area and the tearing area, and the thickness of the rounded corner area to obtain the ratio of the rounded corner area.

[0081] In the specific implementation, the input data is collected, and then the sum of the thickness of the shear area and the tear area is calculated. After the total thickness of the shear area and the tear area is calculated, the proportion of the fillet area is further calculated to obtain the proportion of the fillet area.

[0082] S10412: When the partition thickness ratio is not within the first numerical range, or the fillet area ratio is not within the second numerical range, stop performing sensitivity evaluation on the target metal sheet.

[0083] In the specific implementation, it is first checked whether the partition thickness ratio falls within the predetermined first numerical range, and then it is checked whether the rounded corner area ratio is within the predetermined second numerical range. If any of the above conditions is not met, that is, the partition thickness ratio is not within the first numerical range or the rounded corner area ratio is not within the second numerical range, the sensitivity evaluation of the target metal sheet is stopped to avoid subsequent calculations of plates that do not meet the standards.

[0084] The above implementation of the embodiment of the present application calculates and verifies whether the fillet area ratio and the partition thickness ratio meet the predetermined effective range. If any condition is not met, further sensitivity analysis will be stopped to ensure the reliability and accuracy of the analysis results. The core of the whole process is to ensure that the metal sheet meets the engineering standards and practical application requirements when conducting sensitivity evaluation through conditional judgment and mathematical calculation.

[0085] In order to accurately determine the hole expansion ratio corresponding to the punched circular hole, in some embodiments, the above S103 may include the following steps: S1031 to S1032.

[0086] S1031: using a hole enlarging die to enlarge each of the punched circular holes.

[0087] In a specific implementation, before performing the hole enlarging operation, information about each punched circular hole, such as an initial hole diameter, is obtained, and each of the punched circular holes is enlarged by selecting a suitable hole enlarging tool.

[0088] S1032: Determine the hole expansion rate corresponding to each of the punched circular holes according to the initial hole diameter of each of the punched circular holes and the final hole diameter of each of the punched circular holes after hole expansion.

[0089] In a specific implementation, the hole expansion rate refers to the ratio between the hole diameter after hole expansion and the initial hole diameter, indicating the degree of influence of the hole expansion operation on the hole diameter. After collecting the hole diameter data before and after hole expansion, the hole expansion rate corresponding to each of the punched circular holes is calculated and determined.

[0090] The above-mentioned implementation method of the embodiment of the present application uses a hole expansion mold to expand each of the above-mentioned punched circular holes, and then determines the hole expansion rate corresponding to each of the above-mentioned punched circular holes based on the initial hole diameter of each of the above-mentioned punched circular holes and the final hole diameter of each of the above-mentioned punched circular holes after expansion, and accurately determines the hole expansion rate corresponding to the punched circular holes.

[0091] In order to ensure the reliability and accuracy of the hole expansion operation, in some embodiments, the above S1031 may include the following steps:

[0092] The following operations are performed on each of the punched circular holes: S10311 to S10313.

[0093] S10311: Insert the hole expansion die into the punched circular hole.

[0094] In the specific implementation, the position and size data of each punched circular hole are first obtained, and the expansion die of appropriate size is selected according to the initial aperture of the punched circular hole. When the expansion die is inserted, the die will gradually approach the circular hole to ensure a smooth insertion process.

[0095] S10312: Continue to apply pressure to the hole expansion die until cracks appear on the edge of the punched circular hole.

[0096] In the specific implementation, the hole expansion die is used to apply pressure to the punched circular hole. The hole expansion die will gradually enter the circular hole and expand around it, generating internal force acting on the hole wall. When the applied pressure causes the stress of the hole wall to exceed the yield strength of the material, the material begins to deform plastically. When the pressure is further increased, when the stress exceeds the fracture strength of the material, the hole wall will crack. Once the crack is detected, stop applying pressure.

[0097] S10313: The diameter of the punched circular hole after the application of pressure is stopped is determined as the final diameter of the punched circular hole after expansion.

[0098] In a specific implementation, after a crack appears and the pressure is stopped, the final diameter of the punched circular hole when the expansion die stops applying pressure is calculated.

[0099] In the above implementation of the embodiment of the present application, the hole enlarging die is inserted, pressure is applied until cracks occur, and the final hole diameter after the hole enlarging is finally determined, thereby ensuring the reliability and accuracy of the hole enlarging operation.

[0100] In order to accurately obtain the hole expansion ratio corresponding to the punched circular hole, in some embodiments, the above S1032 may include the following steps:

[0101] The following operations are performed for each of the punched circular holes: S10321 to S10322.

[0102] S10321: Calculate the difference between the final hole diameter after punching and expanding the circular hole and the initial hole diameter.

[0103] In the specific implementation, the initial and final apertures are first extracted from the database records of each hole, and the final aperture is subtracted from the initial aperture to obtain the difference. If the expansion results of some holes are abnormal (for example, the aperture after expansion is smaller than the initial aperture), a warning or abnormal mark is required to avoid affecting the overall data accuracy in subsequent calculations.

[0104] S10322: According to the ratio of the difference to the initial hole diameter, the hole expansion ratio corresponding to the punched circular hole is obtained.

[0105] In a specific implementation, when calculating the hole expansion rate, the hole expansion degree of each circular hole is determined according to the ratio between the initial hole diameter and the difference. All punched circular holes are traversed, and the hole expansion rate of each hole is calculated one by one. The hole diameter difference of each hole is obtained through step S10322, and the hole expansion rate is calculated using the ratio of the difference to the initial hole diameter.

[0106] The above implementation method of the embodiment of the present application calculates the difference between the final hole diameter after hole expansion and the initial hole diameter to obtain the hole diameter change, calculates the hole expansion rate according to the ratio of the difference to the initial hole diameter, and evaluates the hole expansion effect, so that the hole expansion effect of each circular hole can be quantified, and the hole expansion rate corresponding to the punched circular hole can be accurately obtained.

[0107] In some embodiments, for example, the metal sheet to be tested may include a hot-rolled sheet, a pickled sheet, a cold-rolled sheet, and a composite metal sheet, and the thickness specification of the metal sheet to be tested is 1.2 mm-6.0 mm. A method for obtaining the hole expansion rate corresponding to the metal sheet to be tested with at least two known shearing sections of each partition thickness is to expand the target metal sheet to be tested by applying pressure to the hole expansion punch, and obtain the hole expansion rate corresponding to the first through crack appearing at the circular hole of the target metal sheet to be tested as the target hole expansion rate, and the target metal sheet to be tested is any one of the metal sheets to be tested with at least two known shearing sections of each partition thickness.

[0108] For the hole expansion rate when the first crack appears at the circular hole of the target metal plate to be tested, the cracks should have the same judgment criteria in the same test evaluation, including but not limited to the following judgment criteria: the first crack with a maximum width of no more than 0.1mm that penetrates the plate thickness; the first crack that does not penetrate the plate thickness. The cross-section of the hole expansion mold is conical, and the size of the mold is determined according to the thickness of the target metal plate to be tested.

[0109] For example, a high-strength cold-rolled steel plate with a thickness of 1.0 mm was punched into 6 different circular holes for hole expansion using different tools and speeds. The thickness of each partition of the section was then checked. The style of one section was as follows: Figure 2 As shown, using microscopic observation equipment including but not limited to an optical microscope, a laser confocal microscope, a stereo microscope, etc., directly observe the shearing section of the metal sheet, or observe the vertical interface through the shearing section of the metal sheet to obtain the side profile of the processed section; using the ruler of the microscopic observation equipment, directly measure or indirectly measure the thickness of each partition of the section through a photograph; and record the thickness of each partition as: fillet area a, shearing area b, tearing area c and burr area d.

[0110] In this embodiment, the thickness ratio of each partition of the shearing section of the metal plate to be tested is in the range of 0.10≤(a+b) / c≤0.75, and a / (a+b+c)≤0.5. Similarly, the thickness of the partitions of the other five different sections can be measured, as shown in Table 1.

[0111] Table 1

[0112] Fillet area a Shearing area b Tear zone c Burr area d (a+b) / c a / (a+b+c) Hole expansion rate Section 1 0.073 0.196 0.731 0.065 0.368 0.073 28.3 Section 2 0.078 0.185 0.737 0.068 0.357 0.078 31.2 Section 3 0.086 0.212 0.702 0 0.425 0.086 32.5 Section 4 0.088 0.201 0.711 0.07 0.406 0.088 31.1 Section 5 0.065 0.178 0.757 0.056 0.321 0.065 27.8 Section 6 0.092 0.224 0.684 0 0.462 0.092 34

[0113] A sufficiently large blank holding force is applied to the sample to clamp the sample, and a hole expansion experiment is carried out. Then, pressure is applied to make the conical hole expansion punch vertically insert into the punched circular hole of the sample at a certain rate for hole expansion. The experiment is stopped when the first through crack appears. The maximum width of the crack does not exceed 0.1 mm. The hole expansion rate of the metal sheet to be tested at this time is measured and recorded. Another 5 types of metal sheets to be tested with different section partition thickness ratios are subjected to hole expansion experiments respectively. The hole expansion rates corresponding to different section partition thickness ratios at the time of cracking are shown in Table 1.

[0114] The above-obtained section partition thickness ratio and hole expansion rate are fitted into a curve, such as Figure 3 As shown in the figure, the curve is the sensitivity curve of the shear quality of the high-strength cold-rolled steel plate of this thickness specification. The sensitivity curve of the shear quality of the high-strength cold-rolled steel plate of this thickness specification can be further analyzed, including: obtaining the slope of the sensitivity curve, and measuring the sensitivity difference of the shear quality of different metal plates by the slope; reading the hole expansion rate of the untested steel plate shear quality condition from the sensitivity curve, for example, Figure 3 It can be read that the hole expansion ratio when the partition thickness ratio of the cross section is (a+b) / c=0.07 is 27.8%.

[0115] Based on the metal sheet sensitivity evaluation method provided in the above embodiment, the present application also provides a specific implementation of the metal sheet sensitivity evaluation device. Please refer to the following embodiment.

[0116] See first Figure 4 The metal sheet sensitivity evaluation device 400 provided in the embodiment of the present application includes the following modules:

[0117] The processing module 401 is used to process the target metal sheet according to a plurality of different processing parameters, and punch circular holes corresponding to the processing parameters on the target metal sheet.

[0118] The determination module 402 is used to measure the cross-section of each of the punched circular holes and determine the thickness of different partitions of the cross-section corresponding to each of the punched circular holes.

[0119] The determination module 402 is further used to expand each of the punched circular holes and determine the expansion ratio corresponding to each of the punched circular holes.

[0120] The fitting module 403 is used to perform sensitivity curve fitting according to the different partition thicknesses and hole expansion rates corresponding to the punched circular holes, and determine the sensitivity evaluation of the target metal sheet.

[0121] As an implementation of the present application, the determination module 402 includes:

[0122] The determination unit is used to determine the position of the fillet area, the shear area and the tearing area of ​​the cross section corresponding to each of the punched circular holes according to the shape of the cross section of each of the punched circular holes.

[0123] The measuring unit is used to measure the thickness of the fillet area, the thickness of the shear area and the thickness of the tearing area to obtain the thickness of different partitions of the cross section corresponding to each of the punched circular holes.

[0124] As an implementation of the present application, the fitting module 403 includes:

[0125] The calculation unit is used to calculate the ratio of the sum of the thickness of the rounded corner area and the thickness of the shearing area to the thickness of the tearing area to obtain the partition thickness ratio.

[0126] The fitting unit is used to fit the sensitivity curve according to the partition thickness ratio and hole expansion rate corresponding to each of the punched circular holes to obtain the sensitivity curve.

[0127] The determination unit is used to determine the sensitivity evaluation of the target metal sheet according to the slope of the sensitivity curve.

[0128] As an implementation of the present application, a metal sheet sensitivity evaluation device 400 includes:

[0129] The calculation module is used to calculate the ratio of the thickness of the rounded corner area, the sum of the thickness of the shearing area and the tearing area, and the thickness of the rounded corner area to obtain the proportion of the rounded corner area.

[0130] A stop module is used to stop the sensitivity evaluation of the target metal sheet when the partition thickness ratio is not within the first numerical range or the fillet area ratio is not within the second numerical range.

[0131] As an implementation of the present application, the determination module 402 includes:

[0132] The hole enlarging unit is used to enlarge each of the punched circular holes using a hole enlarging die.

[0133] The determination unit is used to determine the hole expansion rate corresponding to each of the punched circular holes according to the initial hole diameter of each of the punched circular holes and the final hole diameter of each of the punched circular holes after hole expansion.

[0134] As an implementation of the present application, the hole expansion unit includes:

[0135] The inserting subunit is used to insert the hole enlarging die into the punching circular hole.

[0136] The pressure applying subunit is used to continuously apply pressure to the hole expansion die until cracks appear on the edge of the punched circular hole.

[0137] The determination subunit is used to determine the diameter of the punched circular hole after stopping the application of pressure as the final diameter of the punched circular hole after expansion.

[0138] As an implementation of the present application, the determining unit includes:

[0139] The calculation subunit is used to calculate the difference between the final hole diameter after punching and expanding the circular hole and the initial hole diameter.

[0140] The determination subunit is used to obtain the hole expansion ratio corresponding to the punched circular hole according to the ratio of the difference value to the initial hole diameter.

[0141] Each module in the metal sheet sensitivity evaluation device provided in the embodiment of the present application can implement each step in the above-mentioned metal sheet sensitivity evaluation method and achieve corresponding effects. For the sake of concise description, they will not be repeated here.

[0142] Figure 5 A schematic diagram of the structure of the metal sheet sensitivity evaluation hardware provided in an embodiment of the present application is shown.

[0143] The metal sheet sensitivity evaluation device may include a processor 501 and a memory 502 storing computer program instructions.

[0144] Specifically, the processor 501 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0145] The memory 502 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 502 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 502 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 502 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 502 is a non-volatile solid-state memory.

[0146] The memory may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical / tangible memory storage device. Thus, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the metal sheet sensitivity evaluation method according to any one of the embodiments of the present disclosure.

[0147] The processor 501 reads and executes the computer program instructions stored in the memory 502 to implement any one of the metal sheet sensitivity evaluation methods in the above embodiments.

[0148] In one example, the metal sheet sensitivity evaluation device may further include a communication interface 503 and a bus 510. Figure 5 As shown, the processor 501, the memory 502, and the communication interface 503 are connected via a bus 510 and communicate with each other.

[0149] The communication interface 503 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0150] Bus 510 includes hardware, software or both, and the parts of online data flow billing equipment are coupled to each other. For example, but not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front-end bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 510 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the present application considers any suitable bus or interconnection.

[0151] In addition, in combination with the method for evaluating the sensitivity of metal sheet in the above embodiment, the embodiment of the present application can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any one of the methods for evaluating the sensitivity of metal sheet in the above embodiment is implemented.

[0152] An embodiment of the present application also provides a computer program product, including a computer program, which, when executed, implements any one of the metal sheet sensitivity evaluation methods in the above embodiments.

[0153] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0154] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0155] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0156] Aspects of the present disclosure are described above with reference to the flowchart and / or block diagram of the method, device (system) and computer program product according to the embodiment of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0157] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A metal sheet sensitivity evaluation method, characterized in that: The method comprises: According to a plurality of different processing parameters, the target metal sheet is processed respectively, and a punched circular hole corresponding to the processing parameters is punched on the target metal sheet; Measuring the cross section of each punched circular hole to determine the thickness of different partitions of the cross section corresponding to each punched circular hole; Expanding each of the punched circular holes to determine the corresponding expansion ratio of each of the punched circular holes; According to the different partition thicknesses and hole expansion rates corresponding to the punched circular holes, a sensitivity curve fitting is performed to determine the sensitivity evaluation of the target metal sheet.

2. The metal sheet sensitivity evaluation method according to claim 1, characterized in that: The measuring of the cross-section of each punched circular hole to determine the thickness of different partitions of the cross-section corresponding to each punched circular hole includes: According to the shape of the cross section of each punched circular hole, the position of the fillet area, the position of the shearing area and the position of the tearing area of ​​the cross section corresponding to each punched circular hole are determined; The thickness of the fillet area, the thickness of the shear area and the thickness of the tearing area are measured to obtain the thickness of different partitions of the cross section corresponding to each of the punched circular holes.

3. The metal sheet sensitivity evaluation method according to claim 2, characterized in that: The fillet area corresponds to the edge of the punched circular hole, a circular arc transition area with a smooth surface. The shear area corresponds to a flat area without obvious cracks formed by shearing in the punched circular hole. The tear area corresponds to a rough area with cracks or bumps formed by material fracture in the punched circular hole.

4. The metal sheet sensitivity evaluation method according to claim 2, characterized in that: The method of fitting a sensitivity curve according to different partition thicknesses and hole expansion rates corresponding to the punched circular holes to determine the sensitivity evaluation of the target metal sheet includes: Calculate the ratio of the sum of the thickness of the fillet area and the thickness of the shear area to the thickness of the tearing area to obtain a partition thickness ratio; According to the partition thickness ratio and hole expansion rate corresponding to each of the punched circular holes, a sensitivity curve is fitted to obtain a sensitivity curve; The sensitivity evaluation of the target metal sheet is determined according to the slope of the sensitivity curve.

5. The metal sheet sensitivity evaluation method according to claim 4, characterized in that: After calculating the ratio of the sum of the thickness of the fillet area and the thickness of the shear area to the thickness of the tearing area to obtain the partition thickness ratio, the method further includes: Calculate the ratio of the thickness of the fillet area, the sum of the thickness of the shear area and the tear area, and the thickness of the fillet area to obtain the fillet area ratio; When the partition thickness ratio is not within the first numerical range, or the fillet area ratio is not within the second numerical range, the sensitivity evaluation of the target metal sheet is stopped.

6. The metal sheet sensitivity evaluation method according to claim 1, characterized in that: The step of expanding each of the punched circular holes and determining the corresponding expansion ratio of each of the punched circular holes includes: Using a hole enlarging die, enlarging each of the punched circular holes; The hole expansion rate corresponding to each of the punched circular holes is determined according to the initial hole diameter of each of the punched circular holes and the final hole diameter of each of the punched circular holes after hole expansion.

7. The metal sheet sensitivity evaluation method according to claim 6, characterized in that: The method of using a hole enlarging die to enlarge each of the punched circular holes comprises: The following operations are performed on each of the punched circular holes: Insert the hole expansion die into the punched circular hole; Continuously applying pressure to the hole-expanding die until cracks appear on the edge of the punched circular hole; The diameter of the punched circular hole after the application of pressure is stopped is determined as the final diameter of the punched circular hole after expansion.

8. The metal sheet sensitivity evaluation method according to claim 6, characterized in that: Determining the hole expansion rate corresponding to each punched circular hole according to the initial hole diameter of each punched circular hole and the final hole diameter after each punched circular hole is expanded includes: The following operations are performed for each of the punched circular holes: Calculate the difference between the final hole diameter after punching and expanding the circular hole and the initial hole diameter; According to the ratio of the difference to the initial hole diameter, the hole expansion ratio corresponding to the punched circular hole is obtained.

9. A metal sheet sensitivity evaluation device, characterized in that: The device comprises: A processing module, used to process the target metal sheet according to a plurality of different processing parameters, and punch circular holes corresponding to the processing parameters on the target metal sheet; A determination module, used to measure the cross section of each punched circular hole and determine the thickness of different partitions of the cross section corresponding to each punched circular hole; The determination module is further used to expand each of the punched circular holes and determine the corresponding expansion rate of each of the punched circular holes; The fitting module is used to perform sensitivity curve fitting according to different partition thicknesses and hole expansion rates corresponding to each of the punched circular holes, and determine the sensitivity evaluation of the target metal sheet.

10. A metal sheet sensitivity evaluation device, characterized in that: The device comprises: a processor and a memory storing computer program instructions; the processor reads and executes the computer program instructions to implement the metal sheet sensitivity evaluation method as described in any one of claims 1-8.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the metal sheet sensitivity evaluation method according to any one of claims 1 to 8 is implemented.

12. A computer program product, characterized in that When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the metal sheet sensitivity evaluation method as described in any one of claims 1 to 8.

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