Metal sheet hyperbolic forming method, device, electronic equipment and storage medium

Abstract

The present application belongs to the technical field of sheet metal processing, and discloses a method, device, electronic device and storage medium for hyperbolic forming of metal sheets. The method comprises: obtaining the material and target processing size of the sheet metal to be processed, determining the target processing area according to the target processing size, calculating the processing times of the sheet metal to be processed based on a preset processing times calculation formula in combination with the target processing area and the target processing size, processing the sheet metal to be processed according to the rebound characteristics and processing times corresponding to the material, and obtaining a formed sheet metal corresponding to the target processing size; processing the sheet metal according to the processing times calculated based on the preset processing times calculation formula and the rebound characteristics corresponding to the sheet metal material, thereby improving the processing efficiency of the sheet metal.

Description

Technical Field

[0001] The present application relates to the technical field of sheet metal processing, and in particular, to a method, device, electronic device and storage medium for hyperbolic forming of metal sheets. Background Art

[0002] Hyperbolic plates are widely used in the automotive, aviation and shipbuilding industries due to their streamlined shape. With the improvement of manufacturing level, the precision requirements of curved plates are also receiving more and more attention.

[0003] At present, the processing of hyperbolic plates is divided into two methods: hot forming and cold forming. Among them, cold forming mainly uses a three-dimensional CNC plate bending machine. According to the multi-point forming principle, the forming surface is constructed by adjusting the height of the lower basic body, and finally the curved plate is quickly cold processed. However, during the processing, when the processing angle of the hyperbolic plate is too large, it will cause defects such as indentation, wrinkles and cracks on the surface of the plate.

[0004] Therefore, in order to solve the technical problem that the existing metal sheet forming method will cause defects such as indentations, wrinkles and cracks on the sheet surface due to excessive processing angles, a metal sheet hyperbolic forming method, device, electronic device and storage medium are urgently needed. Summary of the invention

[0005] The purpose of the present application is to provide a method, device, electronic device and storage medium for hyperbolic forming of metal sheets. The number of processing times is calculated by a target processing area, a target processing size and a preset processing number calculation formula, and then combined with the corresponding rebound characteristics of the sheet material, a formed sheet corresponding to the target processing size is processed to solve the problem that the existing metal sheet forming method may cause defects such as indentations, wrinkles and cracks on the sheet surface due to excessive processing angles. The sheet is processed multiple times by calculating the number of processing times to ensure the forming effect of the sheet, thereby improving the processing efficiency of the sheet.

[0006] In a first aspect, the present application provides a method for double-curved forming of a metal sheet, comprising:

[0007] Obtain the material and target processing size of the plate to be processed;

[0008] Determining a target processing area according to the target processing size;

[0009] Based on a preset processing times calculation formula, the processing times of the plate to be processed are calculated in combination with the target processing area and the target processing size;

[0010] The plate to be processed is processed according to the springback characteristics corresponding to the material and the number of processing times to obtain a formed plate corresponding to the target processing size.

[0011] The hyperbolic forming method for metal sheets provided in the present application can realize the processing of sheets. The number of processing times is calculated through the target processing area, the target processing size and the preset processing number calculation formula. Then, combined with the rebound characteristics corresponding to the sheet material, a formed sheet corresponding to the target processing size is obtained through processing. This solves the problem that the existing metal sheet forming method may cause defects such as indentations, wrinkles and cracks on the sheet surface due to excessive processing angles. The sheet is processed multiple times through the calculated processing number to ensure the forming effect of the sheet, thereby improving the processing efficiency of the sheet.

[0012] Optionally, the target processing size includes a target length arc length and a target width arc length; and determining a target processing area according to the target processing size includes:

[0013] Extracting a target length arc length and a target width arc length from the target processing dimensions;

[0014] The target processing area is calculated according to the product of the target length arc length and the target width arc length.

[0015] Optionally, the preset processing times calculation formula is specifically:

[0016] ;

[0017] Among them, P is the number of processing times; K is the processing factor; T is the target processing area; R is the target curvature radius; H is the target arch height; The rounding function.

[0018] The metal sheet hyperbolic forming method provided in the present application can realize the processing of the sheet. The number of processing times is calculated through a preset processing number calculation formula. The sheet to be processed is processed according to the processing number, which can prevent defects such as indentation, wrinkles and cracks from appearing on the surface of the sheet, and is conducive to improving the processing efficiency of the sheet.

[0019] Optionally, the sheet to be processed is processed according to the springback characteristics corresponding to the material and the number of processing times to obtain a formed sheet corresponding to the target processing size, including:

[0020] Determining a springback curvature radius corresponding to the target processing size according to the springback characteristics corresponding to the material;

[0021] According to the processing times, the plates to be processed are processed in sequence;

[0022] After the last processing is completed, the plate to be processed is processed to the springback curvature radius, so that after the plate to be processed rebounds, a formed plate corresponding to the target processing size is obtained.

[0023] The hyperbolic forming method of metal sheet provided in the present application can realize the processing of sheet. When processing is performed according to the number of processing times, and when performing the last processing, the sheet to be processed is processed to a springback curvature radius, so that after the sheet to be processed rebounds, a formed sheet corresponding to a target processing size is obtained, thereby making the processed sheet that is deformed due to the springback characteristics correspond to the target processing size, which is beneficial to improving the processing efficiency of the sheet.

[0024] Optionally, determining the springback curvature radius corresponding to the target processing size according to the springback characteristics corresponding to the material includes:

[0025] Converting the target radius of curvature of the target machining dimension into a corresponding target curvature;

[0026] According to the rebound characteristics corresponding to the material, a rebound curvature greater than the target curvature is set;

[0027] The springback curvature is converted into a corresponding springback curvature radius.

[0028] Optionally, according to the number of processing times, the to-be-processed plates are processed in sequence, including:

[0029] Generate a processing height for each processing corresponding to the number of processing times;

[0030] Based on the size relationship between the processing height and the preset safe processing height, optimizing the processing times to obtain an optimized processing times;

[0031] The plates to be processed are processed in sequence according to the optimized processing times and processing height.

[0032] Optionally, after processing the sheet to be processed according to the springback characteristics corresponding to the material and the number of processing times to obtain a formed sheet corresponding to the target processing size, the method further includes:

[0033] The surface data and structural data of the formed plate are obtained to check the surface quality and forming accuracy of the formed plate.

[0034] In a second aspect, the present application provides a metal sheet hyperbolic forming device, comprising:

[0035] An acquisition module is used to obtain the material and target processing size of the plate to be processed;

[0036] A determination module, used to determine a target processing area according to the target processing size;

[0037] A calculation module, configured to calculate the number of processing times of the plate to be processed based on a preset processing times calculation formula, in combination with the target processing area and the target processing size;

[0038] The processing module is used to process the plate to be processed according to the rebound characteristics corresponding to the material and the processing times to obtain a formed plate corresponding to the target processing size.

[0039] The metal sheet hyperbolic forming device calculates the number of processing times through a target processing area, a target processing size and a preset processing number calculation formula, and then obtains a formed sheet corresponding to the target processing size in combination with the corresponding rebound characteristics of the sheet material, thereby solving the problem that the existing metal sheet forming method may cause defects such as indentations, wrinkles and cracks on the sheet surface due to excessive processing angles. The sheet is processed multiple times through the calculated processing number to ensure the forming effect of the sheet, thereby improving the processing efficiency of the sheet.

[0040] In a third aspect, the present application provides an electronic device comprising a processor and a memory, wherein the memory stores a computer program executable by the processor, and when the processor executes the computer program, it runs the steps in the metal sheet hyperbolic forming method described above.

[0041] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps in the metal sheet hyperbolic forming method as described above are performed.

[0042] Beneficial effects: The hyperbolic forming method, device, electronic device and storage medium of metal sheet provided in the present application calculate the number of processing times through the target processing area, target processing size and preset processing number calculation formula, and then combine the rebound characteristics corresponding to the sheet material to obtain the formed sheet corresponding to the target processing size. This solves the problem that the existing metal sheet forming method may cause defects such as indentations, wrinkles and cracks on the sheet surface due to excessive processing angles. The sheet is processed multiple times through the calculated processing number to ensure the forming effect of the sheet, thereby improving the processing efficiency of the sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A flow chart of a method for hyperbolic forming of a metal sheet provided in an embodiment of the present application.

[0044] Figure 2 A schematic structural diagram of a metal sheet hyperbolic forming device provided in an embodiment of the present application.

[0045] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0046] Figure 4 A simplified design diagram of a formed plate provided in an embodiment of the present application.

[0047] Explanation of reference numerals: 1. Acquisition module; 2. Determination module; 3. Calculation module; 4. Processing module; 301. Processor; 302. Memory; 303. Communication bus. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0049] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0050] Please refer to Figure 1 , Figure 1 A method for forming a metal sheet by hyperbolic bending in some embodiments of the present application is used to process the sheet, comprising the steps of:

[0051] Step S101, obtaining the material and target processing size of the plate to be processed;

[0052] Step S102, determining a target processing area according to a target processing size;

[0053] Step S103, based on a preset processing times calculation formula, combined with a target processing area and a target processing size, the processing times of the plate to be processed are calculated;

[0054] Step S104, processing the plate to be processed according to the springback characteristics of the material and the number of processing times to obtain a formed plate corresponding to the target processing size.

[0055] The metal sheet hyperbolic forming method calculates the number of processing times through a target processing area, a target processing size and a preset processing number calculation formula, and then obtains a formed sheet corresponding to the target processing size in combination with the corresponding rebound characteristics of the sheet material, thereby solving the problem that the existing metal sheet forming method may cause defects such as indentations, wrinkles and cracks on the sheet surface due to excessive processing angles. The sheet is processed multiple times through the calculated processing number to ensure the forming effect of the sheet, thereby improving the processing efficiency of the sheet.

[0056] Specifically, in step S101, the material and target processing size of the plate to be processed are obtained. The target processing size can be obtained through the design drawing of the formed plate. The target processing size includes a target radius of curvature, a target arch height, a target length arc length, and a target width arc length. The target length arc length and the target width arc length are respectively equal to the length and width of the plate to be processed before processing (the plate to be processed at this time is a flat plate). For the plate to be processed, a reference coordinate system XYZ is introduced, the Z direction is parallel to the normal of the plane where the plate to be processed is located before processing (that is, the Z direction is perpendicular to the plate to be processed before processing), the X direction is parallel to the length direction of the plate to be processed before processing, and the Y direction is parallel to the width direction of the plate to be processed before processing. Thus, the length and width of the plate to be processed before processing are respectively equal to the length of the curve of the formed plate obtained after processing of the plate to be processed on the cross section parallel to the XZ plane (such as Figure 4 X1 in the YZ plane) and the length of the curve on the cross section parallel to the YZ plane (as Figure 4 , the curve of the formed sheet on the cross section parallel to the XZ plane is denoted as the target length arc, and the curve of the formed sheet on the cross section parallel to the YZ plane is denoted as the target width arc; the target arch height refers to the vertical distance between the highest point and the lowest point of the formed sheet in the Z direction, wherein the target arch height includes the target length arch height and the target width arch height, the target length arch height is the vertical distance between the highest point and the lowest point of the curve of the formed sheet on the cross section parallel to the XZ plane in the Z direction, and the target width arch height is the vertical distance between the highest point and the lowest point of the curve of the formed sheet on the cross section parallel to the YZ plane in the Z direction; the target curvature radius refers to the distance from any point on the target length arc or the target width arc to the center of the circle drawn with the target length arc or the target width arc as a part of the circle, wherein the target curvature radius includes the curvature radius corresponding to the target length arc and the curvature radius corresponding to the target width arc, which are denoted as the length curvature radius and the width curvature radius, respectively.

[0057] The target processing size also includes the target length of the formed sheet (such as Figure 4 X2 in ) and the target width (such as Figure 4In Y2, the target length and target width are the length and width of the formed sheet at the top view angle (i.e. the angle of the processing direction) (i.e. the length of the formed sheet in the X direction and the length in the Y direction, respectively). Among them, the target length arc length and the target width arc length are the length and width required to process the sheet to be processed to the target length and target width according to the target curvature radius and the target arch height, that is, at the top view angle, the length and width of the sheet to be processed before processing are the target length arc length and the target width arc length, and the length and width after processing to form the formed sheet are the target length and the target width. The target length arc length and the target width arc length can be obtained through experimental processing.

[0058] like Figure 4 As shown in the figure, R is the target curvature radius, H is the target arch height, X1 is the target arc length, Y1 is the target width arc length, X2 is the target length, Y2 is the target width, the equal sign represents the corresponding value, the unit is mm (millimeter), and the arc number represents the curve. Figure 4 It can be seen that the top view of the formed sheet is a square, therefore, the length radius of curvature is equal to the width radius of curvature (the target radius of curvature R is equal to both the length radius of curvature and the width radius of curvature), the target length arch height is equal to the target width arch height, and the target processing area can be calculated by extracting the target length arc length X1 and the target width arc length Y1 from the figure.

[0059] Specifically, in step S102, the target processing area is determined according to the target processing size, including:

[0060] Extract the target length arc length and the target width arc length from the target processing size;

[0061] The target processing area is calculated based on the product of the target length arc length and the target width arc length.

[0062] In step S102, the target length arc length and the target width arc length of the target processing size are extracted, and the target length arc length is multiplied by the target width arc length to determine the target processing area.

[0063] Specifically, in step S103, the target processing area, the target curvature radius and the target arch height are input into a preset processing times calculation formula to calculate the processing times of the plate to be processed.

[0064] Among them, the preset processing times calculation formula is as follows:

[0065] ;

[0066] Among them, P is the number of processing times; K is the processing factor, which is a very small decimal, generally set to 0.0000001 (i.e. one millionth), and can be adjusted according to actual needs; T is the target processing area; R is the target curvature radius; H is the target arch height; The rounding function.

[0067] Among them, the target curvature radius is negatively correlated with the target processing area, the target curvature radius is negatively correlated with the target arch height, and the target processing area is positively correlated with the target arch height. In specific applications, the target length and target width of the formed sheet at a top-down angle are generally used as processing standards (that is, the target length and target width remain unchanged). According to production requirements, when the target arch height is larger, the target curvature radius is smaller and the target processing area is larger; when the target arch height is smaller, the target curvature radius is larger and the target processing area is smaller.

[0068] Because the hyperbolic panel needs to be processed by hyperbolic surface processing (both the length direction and the width direction need to be bent), the processing times calculation formula is adjusted to the processing times calculation formula of the target length arc and the processing times calculation formula of the target width arc. The processing times calculation formula of the target length arc is specifically:

[0069] ;

[0070] in, is the number of processing times of the target length arc, is the length radius of curvature, The arch height is the target length.

[0071] The specific calculation formula for the number of processing times of the target width arc is:

[0072] ;

[0073] in, is the number of processing times of the target width arc, is the width curvature radius, is the target width arch height.

[0074] In some embodiments, when the formed sheet is a single-curved panel, the processing times calculation formula can also be used for calculation. However, since only a single-curved surface of the processed curved surface needs to be processed on the sheet to be processed, the processing times calculation formula is adjusted to a single-curved surface processing times calculation formula, specifically:

[0075] ;

[0076] in, is the number of times the surface to be processed is processed, is the radius of curvature of the surface to be processed (if the single-curved plate is curved in the length direction, is equal to the length radius of curvature; if the single-curved panel is curved in the width direction, then Equal to the width radius of curvature), is the arch height of the surface to be processed (if the single-curved plate is curved in the length direction, is equal to the target length arch height; if the single-curved panel is curved in the width direction, then equal to the target width arch height).

[0077] For example, Figure 4 As shown, assuming K = 0.0000001, and Figure 4 The middle forming sheet is a double curved sheet. Figure 4 Substitute the relevant data in into the corresponding processing times calculation formula, and calculate that the processing times P2=P3=5, thereby obtaining that the processing times of the target length arc and the processing times of the target width arc are both 5.

[0078] Specifically, in step S104, the plate to be processed is processed according to the springback characteristics and processing times corresponding to the material to obtain a formed plate corresponding to the target processing size, including:

[0079] According to the springback characteristics of the material, the springback curvature radius corresponding to the target processing size is determined;

[0080] According to the number of processing times, the plates to be processed are processed in sequence;

[0081] After the last processing is completed, the sheet to be processed is processed to a springback curvature radius so that a formed sheet corresponding to a target processing size is obtained after the sheet to be processed springs back.

[0082] Specifically, in step S104, the springback curvature radius corresponding to the target processing size is determined according to the springback characteristics of the material, including:

[0083] Converting a target curvature radius of a target machining dimension into a corresponding target curvature;

[0084] According to the rebound characteristics of the material, set a rebound curvature greater than the target curvature;

[0085] Convert the springback curvature to the corresponding springback curvature radius.

[0086] In step S104, the target radius of curvature is converted to the corresponding target curvature according to the calculation relationship between the radius of curvature and the curvature, that is, R=1 / M (R is the radius of curvature, M is the curvature). The curvature (target curvature) is defined as the center angle corresponding to a curved track of a certain chord length (target length arc length or target width arc length). The larger the degree of the center angle, the larger the curvature, the smaller the radius of curvature, and the greater the degree of curvature of the formed sheet; conversely, the smaller the degree of the center angle, the smaller the curvature, the larger the radius of curvature, and the smaller the degree of curvature of the formed sheet.

[0087] When the plate to be processed is processed to the target curvature radius, affected by the springback characteristics, the processed plate to be processed will be affected by the springback effect, and the actual curvature radius of the processed plate to be processed will be greater than the target curvature radius. Therefore, in order to make the actual curvature radius after the springback effect equal to the target curvature radius, it is necessary to set a springback curvature greater than the target curvature (from the calculation relationship between the curvature radius and the curvature, it can be known that the curvature is inversely proportional to the curvature radius).

[0088] For example, a material rebound characteristic query table (the query table is obtained through multiple tests) can be recorded in advance. The query table records the rebound characteristic values ​​corresponding to multiple curvature radii of various materials. The rebound characteristic value corresponding to the target curvature radius is obtained from the query table according to the material of the plate to be processed (for example, the rebound characteristic value corresponding to the target curvature radius is calculated by using the interpolation method according to the curvature radius interval where the target curvature radius is located). The rebound characteristic value of the metal plate is generally 1.2, which needs to be adjusted according to the material and curvature radius. The target curvature is multiplied by the rebound characteristic value to obtain the corresponding rebound curvature.

[0089] Alternatively, the functional relationship between the curvature radius and the rebound characteristic value of various materials can be constructed based on the rebound characteristic values ​​corresponding to multiple curvature radii of various materials obtained from experiments, such as using the curvature radius as the horizontal coordinate and the rebound characteristic value as the vertical coordinate, punctuating the values ​​corresponding to a single material in the coordinate system, and then performing curve fitting based on each punctuation point to obtain the functional relationship between the curvature radius and the rebound characteristic value of a single material, thereby performing curve fitting on the curvature radius and the rebound characteristic values ​​of different materials to obtain the functional relationship between the curvature radius and the rebound characteristic values ​​of various materials; and using the target curvature radius and the functional relationship to calculate the rebound characteristic value. The curve fitting process is a prior art and will not be described in detail here.

[0090] The springback curvature that is greater than the target curvature is converted into a corresponding springback curvature radius (the springback curvature radius is smaller than the target curvature radius).

[0091] In some optional embodiments, the target curvature radius may be directly divided by the rebound characteristic value to calculate the corresponding rebound curvature radius.

[0092] Specifically, in step S104, the plate to be processed is processed in sequence according to the number of processing times, including:

[0093] Generate a processing height for each processing corresponding to the number of processing times;

[0094] Based on the size relationship between the processing height and the preset safe processing height, the processing times are optimized to obtain the optimized processing times;

[0095] According to the optimized processing times and processing height, the plates to be processed are processed in sequence.

[0096] In step S104, the target arch height is divided by the number of processing times to calculate the processing height for each processing. At the same time, according to the processing height for each processing, the curvature radius and curvature after each processing are determined (by using the processing height for each processing and the corresponding length arc and width arc, using the arc length calculation formula ( , L is the length of the length arc or the width arc during each processing, is the central angle of the arc corresponding to the length or width of the arc) and the law of cosines ( ) is calculated to obtain the radius of curvature, and then the radius of curvature is converted into the corresponding curvature through the calculation relationship between the radius of curvature and the curvature (R=1 / M), and the radius of curvature and the curvature of the two direction arcs (length arc and width arc) of the hyperbolic panel after each processing are determined respectively (if the formed plate is a single-curved plate, the radius of curvature and the curvature of the corresponding direction arc (length arc or width arc) after each processing are determined), and the relative height of each position point of the plate to be processed after each processing is calculated by the radius of curvature and the curvature (referring to the height relative to the lowest point of the plate to be processed after each processing. Specifically, the arc length and arch height of the length arc and / or width arc of the plate to be processed after each processing are known values, and the length arc and / or width arc are circular arcs. According to the arc length, arch height and radius of curvature of the length arc and / or width arc, the surface function of the plate to be processed after each processing can be calculated, and then the relative height of each position point is obtained according to the surface function. The specific calculation method is a prior art and will not be described in detail here).

[0097] In some embodiments, the rebound curvature radius can be converted into a corresponding rebound arch height (for example, by obtaining a design drawing of the rebound curvature radius and obtaining a corresponding arch height to obtain the rebound arch height, substituting the rebound curvature radius and the rebound arch height into a corresponding processing number calculation formula to obtain the corresponding processing number, and dividing the rebound arch height by the processing number to calculate the processing height for each processing; thereby, step S103 and step S104 are correspondingly modified as follows: step S103, after calculating the rebound curvature radius and the rebound arch height corresponding to the target processing size according to the rebound characteristics corresponding to the material, the target processing area, the rebound curvature radius and the rebound arch height are input into a preset processing number calculation formula to calculate the processing number of the plate to be processed; step S104, processing the plate to be processed according to the processing number to obtain a formed plate corresponding to the target processing size.

[0098] After calculating the processing height for each processing, it is necessary to determine whether the processing height is greater than the preset safe processing height. When the processing height is less than or equal to the preset safe processing height, the processing height is determined to be the safe processing height (that is, the processing height will not cause defects such as indentation, wrinkles or cracks on the formed sheet) and the corresponding processing times are determined to be the optimized processing times; when the processing height is greater than the preset safe processing height, the processing height needs to be adjusted to the preset safe processing height, and the target arch height (or rebound arch height) is divided by the preset safe processing height, and the optimized processing times are obtained after rounding the calculation result to ensure that the formed sheet will not have defects such as indentation, wrinkles or cracks during each processing. The preset safe processing height can be obtained through experiments, and the specific value can be set according to actual needs.

[0099] According to the number of processing times and processing height, combined with the relative height of each position point during each processing, the plates to be processed are processed in sequence.

[0100] The length arc and width arc of the plate to be processed can be processed simultaneously according to the corresponding processing times. If the processing times corresponding to the length arc and the width arc are not equal, they are processed synchronously first (specifically, the surface function of the plate to be processed after each processing is determined according to the arc length, arch height and curvature radius of the two characteristic arcs after each processing, the relative height of each position point is obtained according to the surface function, and the parameters of the three-dimensional CNC plate bending machine at the corresponding processing position are adjusted according to the relative height of each position point, and then the plate to be processed is pressed and bent by the three-dimensional CNC plate bending machine; wherein the characteristic arc is a general term for the length arc and the width arc; and in specific applications, the three-dimensional CNC plate bending machine will record the processing times corresponding to the formed plates of different specifications (i.e., different target arc lengths (including target length arc length and target width arc length), different target arch heights and different target curvature radii) The number and the surface function at each processing are used to make the corresponding processing program, so that the subsequent processing of plates with the same specifications only needs to select the corresponding forming plate specifications to process other plates to be processed, without having to calculate the number of processing times and the corresponding surface function again), until the feature arc with fewer processing times is completed first, and then continue to process the other unfinished feature arc (at this time, the arc length, arch height and curvature radius of the feature arc that has been processed first remain unchanged, and the surface function of the plate to be processed after each subsequent processing is determined according to the arc length, arch height and curvature radius of the unfinished feature arc after each subsequent processing, and the relative height of each position point is obtained according to the surface function, and the parameters of the 3D CNC plate bending machine at the corresponding processing position are adjusted according to the relative height of each position point, and the plate to be processed is bent by the 3D CNC plate bending machine).

[0101] Alternatively, a single characteristic arc of the plate to be processed can be processed first, and then another characteristic arc can be processed according to the corresponding number of processing times, so as to form a hyperbolic panel with more accurate processing accuracy. After completing the processing of a characteristic arc of the formed plate, the corresponding curvature detection tool (such as a curvature detection tool with a target curvature radius of 500) can be used to check whether the curvature of the characteristic arc meets the corresponding accuracy requirements. If the processed characteristic arc meets the corresponding accuracy requirements, another characteristic arc can be processed. If the processed characteristic arc does not meet the corresponding accuracy requirements, it is necessary to reselect another plate to be processed for processing (this step is applicable to the processing of single-curved panels. During processing, only a single characteristic arc of the plate to be processed needs to be processed, and during inspection, only a single characteristic arc of the plate to be processed needs to be inspected).

[0102] In step S104, according to the number of processing times, after the last processing is completed, further processing is required, that is, the plate to be processed that has been processed to the target curvature radius is processed to the springback curvature radius, so that the plate to be processed can obtain a formed plate corresponding to the target processing size after the processing rebound (when step S103 is modified to calculate the springback curvature radius and springback arch height corresponding to the target processing size according to the springback characteristics corresponding to the material, the target processing area, springback curvature radius and springback arch height are input into the preset processing number calculation formula, and after the processing number of the plate to be processed is calculated, this step does not need to be executed when executing the corresponding step S104).

[0103] In some embodiments, before processing a sheet to be processed that has been processed to a target curvature radius to a springback curvature radius, it is necessary to obtain the springback arch height corresponding to the springback curvature radius, and calculate the difference between the springback arch height and the target arch height, and divide the difference by a preset safe processing height. When the calculation result (referring to the calculation result of dividing the difference by the preset safe processing height) is less than or equal to 1, it is determined that the sheet to be processed can be processed safely with the difference. After the last processing is completed according to the number of processing times, the sheet to be processed that has been processed to the target curvature radius is processed to the springback curvature radius with the difference as the processing height for reprocessing. When the calculation result is greater than 1, the minimum value is selected from the positive integers greater than the calculation result as the number of reprocessing times. After the last processing is completed according to the number of processing times, the sheet to be processed that has been processed to the target curvature radius is processed to the springback curvature radius with the preset safe processing height as the processing height and the number of reprocessing times as the processing times.

[0104] In other embodiments, the forming method can also be used to process single-curved panels. According to the above-mentioned formula for calculating the number of processing times of the single-curved panel, the number of processing times of the curved surface to be processed is calculated, and based on the number of processing times, according to the above-mentioned processing process, a single characteristic arc of the plate to be processed is processed to obtain a single-sided curved formed plate, that is, a single-curved panel.

[0105] Specifically, in step S104, after the plate to be processed is processed according to the springback characteristics and processing times corresponding to the material to obtain a formed plate corresponding to the target processing size, the method further includes:

[0106] The surface data and structural data of the formed sheet are obtained to inspect the surface quality and forming accuracy of the formed sheet.

[0107] After the formed sheet is processed, the surface data (such as surface image) and structural data of the formed sheet are obtained through image recognition technology or manual inspection methods to inspect the surface quality and forming accuracy of the formed sheet. Among them, the surface data is used to detect whether there are defects such as indentations, wrinkles or cracks on the surface of the formed sheet, so as to inspect the surface quality of the formed sheet and determine the accuracy of the preset processing times calculation formula; the structural data includes the actual length arc length, the actual width arc length, the actual arch height, and the length and width at the top view angle. The structural data is compared with the target processing size, and the error between the structural data and the corresponding data of the target processing size is calculated to determine whether the error is within the preset error range. If the error is within the preset error range, it is determined that the formed sheet meets the accuracy requirements of the target processing size. If the error is not within the preset error range, it is determined that the formed sheet does not meet the accuracy requirements of the target processing size, and it is necessary to reselect another sheet to be processed for processing to obtain a formed sheet that meets the accuracy requirements of the target processing size. Among them, the preset error range is set according to actual needs.

[0108] In some embodiments, after processing of a curved surface of a formed sheet is completed, a corresponding curvature detection tool (such as a curvature detection tool with a target curvature radius of 500) can be used to check whether the curvature of the curved surface meets the corresponding precision requirements. If the processed surface meets the corresponding precision requirements, another curved surface can be processed. If the processed surface does not meet the corresponding precision requirements, it is necessary to reselect another sheet to be processed for processing (if the formed sheet is a single-curved panel, it is also possible to check whether the processed surface meets the corresponding precision requirements. When the processed surface meets the corresponding precision requirements, it is determined that the processing of the formed sheet has been completed. When the processed surface does not meet the corresponding precision requirements, it is determined that the processing of the formed sheet has failed, and it is necessary to reselect another sheet to be processed for processing).

[0109] In other embodiments, when the formed plates produced in the same batch (i.e. produced by different 3D CNC plate bending machines at the same time) fail N times in a row (i.e. fail to meet the corresponding precision requirements or have surface defects), it is necessary to adjust the corresponding springback characteristic value (adjust the springback characteristic value by calculation or test) or the safe processing height (adjust the safe processing height by test) so that the adjusted springback characteristic value or the adjusted safe processing height can produce qualified formed plates. Wherein, N is a positive integer greater than 1, and the specific value of N can be set according to actual needs.

[0110] Alternatively, when the qualified rate of the processed formed plates is lower than the preset qualified threshold, if the unqualified formed plates come from the same 3D CNC plate bending machine, it is necessary to adjust the parameters of the 3D CNC plate bending machine to improve the qualified rate of the formed plates produced by the 3D CNC plate bending machine; if the unqualified formed plates come from different 3D CNC plate bending machines, it is necessary to adjust the corresponding rebound characteristic value or safe processing height so that the adjusted rebound characteristic value or the adjusted safe processing height can improve the qualified rate of the formed plates. Among them, the preset qualified threshold can be set according to actual needs.

[0111] As can be seen from the above, the hyperbolic forming method of the metal sheet obtains the material and target processing size of the sheet to be processed, determines the target processing area according to the target processing size, calculates the processing times of the sheet to be processed based on a preset processing times calculation formula, combined with the target processing area and the target processing size, and processes the sheet to be processed according to the rebound characteristics and processing times corresponding to the material to obtain a formed sheet corresponding to the target processing size; thus, the processing times are calculated through the target processing area, the target processing size and the preset processing times calculation formula, and then the formed sheet corresponding to the target processing size is processed in combination with the rebound characteristics corresponding to the sheet material, thereby solving the problem that the existing metal sheet forming method may cause defects such as indentations, wrinkles and cracks on the sheet surface due to excessive processing angles, and the sheet is processed multiple times through the calculated processing times to ensure the forming effect of the sheet, thereby improving the processing efficiency of the sheet.

[0112] refer to Figure 2 The present application provides a metal sheet hyperbolic forming device for processing the sheet, comprising:

[0113] Acquisition module 1, used to acquire the material and target processing size of the plate to be processed;

[0114] Determination module 2, used to determine the target processing area according to the target processing size;

[0115] The calculation module 3 is used to calculate the processing times of the plate to be processed based on a preset processing times calculation formula, combined with the target processing area and the target processing size;

[0116] The processing module 4 is used to process the plate to be processed according to the corresponding springback characteristics of the material and the number of processing times to obtain a formed plate corresponding to the target processing size.

[0117] The metal sheet hyperbolic forming device calculates the number of processing times through a target processing area, a target processing size and a preset processing number calculation formula, and then obtains a formed sheet corresponding to the target processing size in combination with the corresponding rebound characteristics of the sheet material, thereby solving the problem that the existing metal sheet forming method may cause defects such as indentations, wrinkles and cracks on the sheet surface due to excessive processing angles. The sheet is processed multiple times through the calculated processing number to ensure the forming effect of the sheet, thereby improving the processing efficiency of the sheet.

[0118] Specifically, when the acquisition module 1 is executed, it acquires the material and target processing size of the plate to be processed. Among them, the target processing size can be obtained through the design drawing of the formed plate. The target processing size includes the target radius of curvature, the target arch height, the target length arc length and the target width arc length. Among them, the target length arc length and the target width arc length are respectively equal to the length and width of the plate to be processed before processing (the plate to be processed at this time is a flat plate). For the plate to be processed, a reference coordinate system XYZ is introduced, the Z direction is parallel to the normal of the plane where the plate to be processed is located before processing (that is, the Z direction is perpendicular to the plate to be processed before processing), the X direction is parallel to the length direction of the plate to be processed before processing, and the Y direction is parallel to the width direction of the plate to be processed before processing. Thus, the length and width of the plate to be processed before processing are respectively equal to the length of the curve of the formed plate obtained after the plate to be processed on the cross section parallel to the XZ plane (such as Figure 4 X1 in the YZ plane) and the length of the curve on the cross section parallel to the YZ plane (as Figure 4 , the curve of the formed sheet on the cross section parallel to the XZ plane is denoted as the target length arc, and the curve of the formed sheet on the cross section parallel to the YZ plane is denoted as the target width arc; the target arch height refers to the vertical distance between the highest point and the lowest point of the formed sheet in the Z direction, wherein the target arch height includes the target length arch height and the target width arch height, the target length arch height is the vertical distance between the highest point and the lowest point of the curve of the formed sheet on the cross section parallel to the XZ plane in the Z direction, and the target width arch height is the vertical distance between the highest point and the lowest point of the curve of the formed sheet on the cross section parallel to the YZ plane in the Z direction; the target curvature radius refers to the distance from any point on the target length arc or the target width arc to the center of the circle drawn with the target length arc or the target width arc as a part of the circle, wherein the target curvature radius includes the curvature radius corresponding to the target length arc and the curvature radius corresponding to the target width arc, which are denoted as the length curvature radius and the width curvature radius, respectively.

[0119] The target processing size also includes the target length of the formed sheet (such as Figure 4 X2 in ) and the target width (such as Figure 4In Y2, the target length and target width are the length and width of the formed sheet at the top view angle (i.e. the angle of the processing direction) (i.e. the length of the formed sheet in the X direction and the length in the Y direction, respectively). Among them, the target length arc length and the target width arc length are the length and width required to process the sheet to be processed to the target length and target width according to the target curvature radius and the target arch height, that is, at the top view angle, the length and width of the sheet to be processed before processing are the target length arc length and the target width arc length, and the length and width after processing to form the formed sheet are the target length and the target width. The target length arc length and the target width arc length can be obtained through experimental processing.

[0120] like Figure 4 As shown in the figure, R is the target curvature radius, H is the target arch height, X1 is the target arc length, Y1 is the target width arc length, X2 is the target length, Y2 is the target width, the equal sign represents the corresponding value, the unit is mm (millimeter), and the arc number represents the curve. Figure 4 It can be seen that the top view of the formed sheet is a square, therefore, the length radius of curvature is equal to the width radius of curvature (the target radius of curvature R is equal to both the length radius of curvature and the width radius of curvature), the target length arch height is equal to the target width arch height, and the target processing area can be calculated by extracting the target length arc length X1 and the target width arc length Y1 from the figure.

[0121] Specifically, when determining the target processing area according to the target processing size, the determination module 2 executes:

[0122] Extract the target length arc length and the target width arc length from the target processing size;

[0123] The target processing area is calculated based on the product of the target length arc length and the target width arc length.

[0124] When the determination module 2 is executed, the target length arc length and the target width arc length of the target processing size are extracted, and the target length arc length is multiplied by the target width arc length to determine the target processing area.

[0125] Specifically, when the calculation module 3 is executed, the target processing area, the target curvature radius and the target arch height are input into a preset processing times calculation formula to calculate the processing times of the plate to be processed.

[0126] Among them, the preset processing times calculation formula is as follows:

[0127] ;

[0128] Among them, P is the number of processing times; K is the processing factor, which is a very small decimal, generally set to 0.0000001 (i.e. one millionth), and can be adjusted according to actual needs; T is the target processing area; R is the target curvature radius; H is the target arch height; The rounding function.

[0129] Among them, the target curvature radius is negatively correlated with the target processing area, the target curvature radius is negatively correlated with the target arch height, and the target processing area is positively correlated with the target arch height. In specific applications, the target length and target width of the formed sheet at a top-down angle are generally used as processing standards (that is, the target length and target width remain unchanged). According to production requirements, when the target arch height is larger, the target curvature radius is smaller and the target processing area is larger; when the target arch height is smaller, the target curvature radius is larger and the target processing area is smaller.

[0130] Because the hyperbolic panel needs to be processed by hyperbolic surface processing (both the length direction and the width direction need to be bent), the processing times calculation formula is adjusted to the processing times calculation formula of the target length arc and the processing times calculation formula of the target width arc. The processing times calculation formula of the target length arc is specifically:

[0131] ;

[0132] in, is the number of processing times of the target length arc, is the length radius of curvature, The arch height is the target length.

[0133] The specific calculation formula for the number of processing times of the target width arc is:

[0134] ;

[0135] in, is the number of processing times of the target width arc, is the width curvature radius, is the target width arch height.

[0136] In some embodiments, when the formed sheet is a single-curved sheet, the processing times calculation formula can also be used for calculation. However, since only a single-curved surface of the sheet to be processed needs to be processed, the processing times calculation formula is adjusted to a single-curved surface processing times calculation formula, specifically:

[0137] ;

[0138] in, is the number of times the surface to be processed is processed, is the radius of curvature of the surface to be processed (if the single-curved plate is curved in the length direction, is equal to the length radius of curvature; if the single-curved panel is curved in the width direction, then Equal to the width radius of curvature), is the arch height of the surface to be processed (if the single-curved plate is curved in the length direction, is equal to the target length arch height; if the single-curved panel is curved in the width direction, then equal to the target width arch height).

[0139] For example, Figure 4 As shown, assuming K = 0.0000001, and Figure 4 The middle forming sheet is a double curved sheet. Figure 4 Substitute the relevant data in into the corresponding processing times calculation formula, and calculate that the processing times P2=P3=5, thereby obtaining that the processing times of the target length arc and the processing times of the target width arc are both 5.

[0140] Specifically, when the processing module 4 processes the plate to be processed according to the springback characteristics and processing times corresponding to the material to obtain a formed plate corresponding to the target processing size, the processing module 4 executes:

[0141] According to the springback characteristics of the material, the springback curvature radius corresponding to the target processing size is determined;

[0142] According to the number of processing times, the plates to be processed are processed in sequence;

[0143] After the last processing is completed, the sheet to be processed is processed to a springback curvature radius so that a formed sheet corresponding to a target processing size is obtained after the sheet to be processed springs back.

[0144] Specifically, when the processing module 4 determines the springback curvature radius corresponding to the target processing size according to the springback characteristics corresponding to the material, it executes:

[0145] Converting a target curvature radius of a target machining dimension into a corresponding target curvature;

[0146] According to the rebound characteristics of the material, set a rebound curvature greater than the target curvature;

[0147] Convert the springback curvature to the corresponding springback curvature radius.

[0148] When the processing module 4 is executed, the target curvature radius is converted into the corresponding target curvature according to the calculation relationship between the curvature radius and the curvature, that is, R=1 / M (R is the curvature radius, M is the curvature). Among them, the curvature (target curvature) is defined as the center angle corresponding to the curved track of a certain chord length (target length arc length or target width arc length). The larger the degree of the center angle, the larger the curvature, the smaller the curvature radius, and the greater the curvature degree of the formed sheet; conversely, the smaller the degree of the center angle, the smaller the curvature, the larger the curvature radius, and the smaller the curvature degree of the formed sheet.

[0149] When the plate to be processed is processed to the target curvature radius, affected by the springback characteristics, the processed plate to be processed will be affected by the springback effect, and the actual curvature radius of the processed plate to be processed will be greater than the target curvature radius. Therefore, in order to make the actual curvature radius after the springback effect equal to the target curvature radius, it is necessary to set a springback curvature greater than the target curvature (from the calculation relationship between the curvature radius and the curvature, it can be known that the curvature is inversely proportional to the curvature radius).

[0150] For example, a material rebound characteristic query table (the query table is obtained through multiple tests) can be recorded in advance. The query table records the rebound characteristic values ​​corresponding to multiple curvature radii of various materials. The rebound characteristic value corresponding to the target curvature radius is obtained from the query table according to the material of the plate to be processed (for example, the rebound characteristic value corresponding to the target curvature radius is calculated by using the interpolation method according to the curvature radius interval where the target curvature radius is located). The rebound characteristic value of the metal plate is generally 1.2, which needs to be adjusted according to the material and curvature radius. The target curvature is multiplied by the rebound characteristic value to obtain the corresponding rebound curvature.

[0151] Alternatively, the functional relationship between the curvature radius and the rebound characteristic value of various materials can be constructed based on the rebound characteristic values ​​corresponding to multiple curvature radii of various materials obtained from experiments, such as using the curvature radius as the horizontal coordinate and the rebound characteristic value as the vertical coordinate, punctuating the values ​​corresponding to a single material in the coordinate system, and then performing curve fitting based on each punctuation point to obtain the functional relationship between the curvature radius and the rebound characteristic value of a single material, thereby performing curve fitting on the curvature radius and the rebound characteristic values ​​of different materials to obtain the functional relationship between the curvature radius and the rebound characteristic values ​​of various materials; and using the target curvature radius and the functional relationship to calculate the rebound characteristic value. The curve fitting process is a prior art and will not be described in detail here.

[0152] The rebound curvature that is greater than the target curvature is converted into a corresponding rebound curvature radius (the rebound curvature radius is smaller than the target curvature radius).

[0153] In some optional embodiments, the target curvature radius may be directly divided by the rebound characteristic value to calculate the corresponding rebound curvature radius.

[0154] Specifically, when the processing module 4 processes the plate to be processed in sequence according to the number of processing times, it executes:

[0155] Generate a processing height for each processing corresponding to the number of processing times;

[0156] Based on the size relationship between the processing height and the preset safe processing height, the processing times are optimized to obtain the optimized processing times;

[0157] According to the optimized processing times and processing height, the plates to be processed are processed in sequence.

[0158] When the processing module 4 is executed, the target arch height is divided by the number of processing times to calculate the processing height of each processing. At the same time, according to the processing height of each processing, the curvature radius and curvature after each processing are determined (through the processing height of each processing and the corresponding length arc and width arc, using the arc length calculation formula ( , L is the length of the length arc or the width arc during each processing, is the central angle of the arc corresponding to the length or width of the arc) and the law of cosines ( ) is calculated to obtain the radius of curvature, and then the radius of curvature is converted into the corresponding curvature through the calculation relationship between the radius of curvature and the curvature (R=1 / M), and the radius of curvature and the curvature of the two direction arcs (length arc and width arc) of the hyperbolic panel after each processing are determined respectively (if the formed plate is a single-curved plate, the radius of curvature and the curvature of the corresponding direction arc (length arc or width arc) after each processing are determined), and the relative height of each position point of the plate to be processed after each processing is calculated by the radius of curvature and the curvature (referring to the height relative to the lowest point of the plate to be processed after each processing. Specifically, the arc length and arch height of the length arc and / or width arc of the plate to be processed after each processing are known values, and the length arc and / or width arc are circular arcs. According to the arc length, arch height and radius of curvature of the length arc and / or width arc, the surface function of the plate to be processed after each processing can be calculated, and then the relative height of each position point is obtained according to the surface function. The specific calculation method is a prior art and will not be described in detail here).

[0159] In some embodiments, the rebound curvature radius can be converted into the corresponding rebound arch height (for example, the corresponding arch height is obtained by obtaining the design drawing of the rebound curvature radius, the rebound curvature radius and the rebound arch height are substituted into the corresponding processing number calculation formula to obtain the corresponding processing number, and the rebound arch height is divided by the processing number to calculate the processing height for each processing; thereby, the steps executed by the calculation module 3 and the processing module 4 are modified accordingly, so that the calculation module 3 and the processing module 4 are modified as follows: the calculation module 3 is used to calculate the rebound curvature radius and the rebound arch height corresponding to the target processing size according to the rebound characteristics corresponding to the material, and then input the target processing area, the rebound curvature radius and the rebound arch height into a preset processing number calculation formula to calculate the processing number of the plate to be processed; the processing module 4 is used to process the plate to be processed according to the processing number to obtain a formed plate corresponding to the target processing size.

[0160] After calculating the processing height for each processing, it is necessary to determine whether the processing height is greater than the preset safe processing height. When the processing height is less than or equal to the preset safe processing height, the processing height is determined to be the safe processing height (that is, the processing height will not cause defects such as indentation, wrinkles or cracks on the formed sheet) and the corresponding processing times are determined to be the optimized processing times; when the processing height is greater than the preset safe processing height, the processing height needs to be adjusted to the preset safe processing height, and the target arch height (or rebound arch height) is divided by the preset safe processing height, and the optimized processing times are obtained after rounding the calculation result to ensure that the formed sheet will not have defects such as indentation, wrinkles or cracks during each processing. The preset safe processing height can be obtained through experiments, and the specific value can be set according to actual needs.

[0161] According to the number of processing times and processing height, combined with the relative height of each position point during each processing, the plates to be processed are processed in sequence.

[0162] The length arc and width arc of the plate to be processed can be processed simultaneously according to the corresponding processing times. If the processing times corresponding to the length arc and the width arc are not equal, they are processed synchronously first (specifically, the surface function of the plate to be processed after each processing is determined according to the arc length, arch height and curvature radius of the two characteristic arcs after each processing, the relative height of each position point is obtained according to the surface function, and the parameters of the three-dimensional CNC plate bending machine at the corresponding processing position are adjusted according to the relative height of each position point, and then the plate to be processed is pressed and bent by the three-dimensional CNC plate bending machine; wherein the characteristic arc is a general term for the length arc and the width arc; and in specific applications, the three-dimensional CNC plate bending machine will record the processing times corresponding to the formed plates of different specifications (i.e., different target arc lengths (including target length arc length and target width arc length), different target arch heights and different target curvature radii) The number and the surface function at each processing are used to make the corresponding processing program, so that the subsequent processing of plates with the same specifications only needs to select the corresponding forming plate specifications to process other plates to be processed, without having to calculate the number of processing times and the corresponding surface function again), until the feature arc with fewer processing times is completed first, and then continue to process the other unfinished feature arc (at this time, the arc length, arch height and curvature radius of the feature arc that has been processed first remain unchanged, and the surface function of the plate to be processed after each subsequent processing is determined according to the arc length, arch height and curvature radius of the unfinished feature arc after each subsequent processing, and the relative height of each position point is obtained according to the surface function, and the parameters of the 3D CNC plate bending machine at the corresponding processing position are adjusted according to the relative height of each position point, and the plate to be processed is bent by the 3D CNC plate bending machine).

[0163] Alternatively, a single characteristic arc of the plate to be processed can be processed first, and then another characteristic arc can be processed according to the corresponding number of processing times, so as to form a hyperbolic panel with more accurate processing accuracy. After completing the processing of a characteristic arc of the formed plate, the corresponding curvature detection tool (such as a curvature detection tool with a target curvature radius of 500) can be used to check whether the curvature of the characteristic arc meets the corresponding accuracy requirements. If the processed characteristic arc meets the corresponding accuracy requirements, another characteristic arc can be processed. If the processed characteristic arc does not meet the corresponding accuracy requirements, it is necessary to reselect another plate to be processed for processing (this step is applicable to the processing of single-curved panels. During processing, only a single characteristic arc of the plate to be processed needs to be processed, and during inspection, only a single characteristic arc of the plate to be processed needs to be inspected).

[0164] When the processing module 4 is executed, according to the number of processing times, after completing the last processing, further processing is required, that is, the plate to be processed that has been processed to the target curvature radius is processed to the springback curvature radius, so that the plate to be processed can obtain a formed plate corresponding to the target processing size after the processing rebound (when the steps executed by the calculation module 3 are modified to calculate the springback curvature radius and springback arch height corresponding to the target processing size according to the springback characteristics corresponding to the material, the target processing area, springback curvature radius and springback arch height are input into the preset processing number calculation formula, and after the processing number of the plate to be processed is calculated, this step does not need to be executed when the corresponding modified processing module 4 is executed).

[0165] In some embodiments, before processing a sheet to be processed that has been processed to a target curvature radius to a springback curvature radius, it is necessary to obtain the springback arch height corresponding to the springback curvature radius, and calculate the difference between the springback arch height and the target arch height, and divide the difference by a preset safe processing height. When the calculation result (referring to the calculation result of dividing the difference by the preset safe processing height) is less than or equal to 1, it is determined that the sheet to be processed can be processed safely with the difference. After the last processing is completed according to the number of processing times, the sheet to be processed that has been processed to the target curvature radius is processed to the springback curvature radius with the difference as the processing height for reprocessing. When the calculation result is greater than 1, the minimum value is selected from the positive integers greater than the calculation result as the number of reprocessing times. After the last processing is completed according to the number of processing times, the sheet to be processed that has been processed to the target curvature radius is processed to the springback curvature radius with the preset safe processing height as the processing height and the number of reprocessing times as the processing times.

[0166] In other embodiments, the metal sheet hyperbolic forming device can also be used to process single-curved panels. According to the above-mentioned calculation formula for the number of processing times of the single-curved panel, the number of processing times of the curved surface to be processed is calculated, and based on the number of processing times, according to the corresponding execution steps of each module of the metal sheet hyperbolic forming device (acquisition module 1, determination module 2, calculation module 3 and processing module 4), a single characteristic arc of the sheet to be processed is processed to obtain a single-sided bent formed sheet, that is, a single-curved panel.

[0167] Specifically, the metal sheet hyperbolic forming device also includes:

[0168] The inspection module is used to obtain the surface data and structural data of the formed sheet material to inspect the surface quality and forming accuracy of the formed sheet material.

[0169] After the formed sheet is processed, the inspection module obtains the surface data (such as surface image) and structural data of the formed sheet through image recognition technology to inspect the surface quality and forming accuracy of the formed sheet. Among them, the surface data is used to detect whether there are defects such as indentations, wrinkles or cracks on the surface of the formed sheet, so as to inspect the surface quality of the formed sheet and determine the accuracy of the preset processing times calculation formula; the structural data includes the actual length arc length, the actual width arc length, the actual arch height, and the length and width at the top view angle. The structural data is compared with the target processing size, and the error between the structural data and the corresponding data of the target processing size is calculated to determine whether the error is within the preset error range. If the error is within the preset error range, it is determined that the formed sheet meets the accuracy requirements of the target processing size. If the error is not within the preset error range, it is determined that the formed sheet does not meet the accuracy requirements of the target processing size, and it is necessary to reselect another sheet to be processed for processing to obtain a formed sheet that meets the accuracy requirements of the target processing size. Among them, the preset error range is set according to actual needs.

[0170] In some embodiments, after processing of a curved surface of a formed sheet is completed, a corresponding curvature detection tool (such as a curvature detection tool with a target curvature radius of 500) can be used to check whether the curvature of the curved surface meets the corresponding precision requirements. If the processed surface meets the corresponding precision requirements, another curved surface can be processed. If the processed surface does not meet the corresponding precision requirements, it is necessary to reselect another sheet to be processed for processing (if the formed sheet is a single-curved panel, it is also possible to check whether the processed surface meets the corresponding precision requirements. When the processed surface meets the corresponding precision requirements, it is determined that the processing of the formed sheet has been completed. When the processed surface does not meet the corresponding precision requirements, it is determined that the processing of the formed sheet has failed, and it is necessary to reselect another sheet to be processed for processing).

[0171] In other embodiments, when the formed sheets produced in the same batch fail N times in a row (i.e., fail to meet the corresponding precision requirements or have surface defects), it is necessary to adjust the corresponding rebound characteristic value (adjust the rebound characteristic value by calculation or test) or the safe processing height (adjust the safe processing height by test) so that the adjusted rebound characteristic value or the adjusted safe processing height can produce qualified formed sheets. Wherein, N is a positive integer greater than 1, and the specific value of N can be set according to actual needs.

[0172] Alternatively, when the qualified rate of the processed formed plates is lower than the preset qualified threshold, if the unqualified formed plates come from the same 3D CNC plate bending machine, it is necessary to adjust the parameters of the 3D CNC plate bending machine to improve the qualified rate of the formed plates produced by the 3D CNC plate bending machine; if the unqualified formed plates come from different 3D CNC plate bending machines, it is necessary to adjust the corresponding rebound characteristic value or safe processing height so that the adjusted rebound characteristic value or the adjusted safe processing height can improve the qualified rate of the formed plates. Among them, the preset qualified threshold can be set according to actual needs.

[0173] As can be seen from the above, the metal sheet hyperbolic forming device obtains the material and target processing size of the sheet to be processed, determines the target processing area according to the target processing size, calculates the processing times of the sheet to be processed based on a preset processing times calculation formula, combined with the target processing area and the target processing size, and processes the sheet to be processed according to the rebound characteristics and processing times corresponding to the material to obtain a formed sheet corresponding to the target processing size; thus, the processing times are calculated through the target processing area, the target processing size and the preset processing times calculation formula, and then combined with the rebound characteristics corresponding to the sheet material, the formed sheet corresponding to the target processing size is processed, thereby solving the problem that the existing metal sheet forming method will cause defects such as indentations, wrinkles and cracks on the sheet surface due to excessive processing angles, and the sheet is processed multiple times through the calculated processing times to ensure the forming effect of the sheet, thereby improving the processing efficiency of the sheet.

[0174] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The present application provides an electronic device, including: a processor 301 and a memory 302. The processor 301 and the memory 302 are interconnected and communicate with each other through a communication bus 303 and / or other forms of connection mechanisms (not shown). The memory 302 stores a computer program executable by the processor 301. When the electronic device is running, the processor 301 executes the computer program to execute the metal sheet hyperbolic forming method in any optional implementation of the above-mentioned embodiment to achieve the following functions: obtaining the material and target processing size of the sheet to be processed, determining the target processing area according to the target processing size, calculating the processing times of the sheet to be processed based on a preset processing times calculation formula in combination with the target processing area and the target processing size, processing the sheet to be processed according to the rebound characteristics and processing times corresponding to the material to obtain a formed sheet corresponding to the target processing size.

[0175] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the metal sheet hyperbolic forming method in any optional implementation of the above embodiment is executed to achieve the following functions: obtaining the material and target processing size of the sheet to be processed, determining the target processing area according to the target processing size, calculating the number of processing times of the sheet to be processed based on a preset processing times calculation formula in combination with the target processing area and the target processing size, processing the sheet to be processed according to the rebound characteristics and processing times corresponding to the material to obtain a formed sheet corresponding to the target processing size. Among them, the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable red-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0176] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0177] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0178] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0179] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0180] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for forming a metal sheet by hyperbolic forming, used for processing the sheet, characterized in that: Includes steps: Obtain the material and target processing size of the plate to be processed; Determining a target processing area according to the target processing size; Based on a preset processing times calculation formula, the processing times of the plate to be processed are calculated in combination with the target processing area and the target processing size; According to the springback characteristics corresponding to the material and the number of processing times, the plate to be processed is processed to obtain a formed plate corresponding to the target processing size; The preset processing times calculation formula is specifically: ； Among them, P is the number of processing times; K is the processing factor; T is the target processing area; R is the target curvature radius; H is the target arch height; is the rounding function; The target processing size includes a target length arc length and a target width arc length; according to the target processing size, determining a target processing area includes: Extracting a target length arc length and a target width arc length from the target processing dimensions; The target processing area is calculated according to the product of the target length arc length and the target width arc length.

2. The method for hyperbolic forming of metal sheet according to claim 1, characterized in that: According to the springback characteristics corresponding to the material and the number of processing times, the plate to be processed is processed to obtain a formed plate corresponding to the target processing size, including: Determining a springback curvature radius corresponding to the target processing size according to the springback characteristics corresponding to the material; According to the processing times, the plates to be processed are processed in sequence; After the last processing is completed, the plate to be processed is processed to the springback curvature radius, so that after the plate to be processed rebounds, a formed plate corresponding to the target processing size is obtained.

3. The method for hyperbolic forming of metal sheet according to claim 2, characterized in that: Determining the springback curvature radius corresponding to the target processing size according to the springback characteristics corresponding to the material includes: Converting the target radius of curvature of the target machining dimension into a corresponding target curvature; According to the rebound characteristics corresponding to the material, a rebound curvature greater than the target curvature is set; The springback curvature is converted into a corresponding springback curvature radius.

4. The method for hyperbolic forming of metal sheet according to claim 2, characterized in that: According to the processing times, the to-be-processed plates are processed in sequence, including: Generate a processing height for each processing corresponding to the number of processing times; Based on the size relationship between the processing height and the preset safe processing height, optimizing the processing times to obtain an optimized processing times; The plates to be processed are processed in sequence according to the optimized processing times and processing heights.

5. The method for hyperbolic forming of metal sheet according to claim 1, characterized in that: According to the springback characteristics corresponding to the material and the number of processing times, the plate to be processed is processed to obtain a formed plate corresponding to the target processing size, and further includes: The surface data and structural data of the formed plate are obtained to check the surface quality and forming accuracy of the formed plate.

6. A metal sheet hyperbolic forming device, used to perform the steps of the metal sheet hyperbolic forming method according to any one of claims 1 to 5 to process the sheet, characterized in that: include: An acquisition module is used to obtain the material and target processing size of the plate to be processed; A determination module, used to determine a target processing area according to the target processing size; A calculation module, configured to calculate the number of processing times of the plate to be processed based on a preset processing times calculation formula, in combination with the target processing area and the target processing size; The processing module is used to process the plate to be processed according to the rebound characteristics corresponding to the material and the processing times to obtain a formed plate corresponding to the target processing size.

7. An electronic device, characterized in that: It comprises a processor and a memory, wherein the memory stores a computer program executable by the processor, and when the processor executes the computer program, it runs the steps in the metal sheet hyperbolic forming method as described in any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the metal sheet hyperbolic forming method according to any one of claims 1 to 5 are executed.

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