Design method of rolling oval pass

Abstract

This invention discloses a design method for an elliptical rolling pass, relating to the field of rolling technology. The method includes the following steps: S1 Determining the pass output parameters: Simplifying the shape of the elliptical pass, defining and determining the parameters, and determining the calculation formula for these parameters; S2 Obtaining basic parameters: Obtaining data parameters of the material shape before and after rolling through past rolling records or practical experience, and summarizing and calculating these data parameters. This invention's method for designing an elliptical rolling pass determines the output parameters, establishes the calculation formula for the elliptical pass parameters, obtains data parameters of the material shape before and after rolling through past rolling records or practical experience, and uses computer software to program and set relevant parameters for automatic calculation. This method is fast, accurate, and avoids frequent and complex manual calculations.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and in particular to a design method for an elliptical rolling die. Background Technology

[0002] When designing rolling mill pass patterns, elliptical pass patterns are particularly difficult and time-consuming to design. The steps are as follows: Calculate the pass height *h* based on the reduction amount, determine the roll gap *s*, initially estimate the pass width *b*, calculate the radius *R*, draw the pass diagram, calculate the width spread, calculate the pass area, and then verify the elongation coefficient and width spread. Based on the deviations in width spread and pass area, the pass height and width are adjusted again. After multiple adjustments, the deviations in the pass width and area are brought within a reasonable range. This method is time-consuming, labor-intensive, computationally complex, and prone to errors due to large calculation deviations. Summary of the Invention

[0003] The purpose of this invention is to provide a design method for elliptical rolling mill passes. After determining the output parameters of the pass, the method determines the parameter calculation formula for the elliptical pass. By obtaining data parameters of the material before and after rolling through previous rolling records or practical experience, the method obtains the calculation formula between these data parameters. The method uses computer software to write a program, designing three parts of LISP code: a drawing program, an area calculation program, and a loop calculation program. With relevant parameters set, the method automatically calculates the parameters, achieving high speed and accuracy, avoiding frequent and complex manual calculations. The method presets the height H, width B, and roller size of the elliptical pass. The seam value s and the chamfer r at the arc of the preset elliptical hole are set based on real-world experience or historical data. The drawing program automatically extracts the coefficient values ​​corresponding to the specific values ​​of each parameter, calculates the relevant preset values, reduces errors, and achieves high accuracy. The elliptical hole is drawn using computer drawing software, and the arc radius R is automatically given in the drawn hole drawing. The actual material shape area f1 is calculated using the width expansion formula. Through iterative calculation, the error is reduced, the final elliptical hole is adjusted and determined, and the drawing is repeatedly redrawn to form a region and calculate the area. The calculation is accurate and has high precision, thus solving the problems mentioned in the background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a design method for an elliptical rolling mill die, comprising the following steps:

[0005] S1 determines the output parameters of the hole type: the shape of the elliptical hole type is simplified, the parameters of the elliptical hole type are determined, and the calculation formula of the parameters of the elliptical hole type is determined.

[0006] S2 Obtain basic parameters: Through past rolling records or practical experience, obtain data parameters of the material shape before and after rolling, summarize and calculate the data parameters, write computer software programs, and calculate the theoretical area f of the material shape in this pass. The computer software programs include three parts: drawing program, area calculation program, and loop calculation program.

[0007] S3 Preset Parameter Values ​​and Draw: Using the parameter calculation formula for the elliptical hole, based on the determined data parameters, preset the parameters of the elliptical hole, and draw the elliptical hole using computer drawing software based on the preset elliptical hole parameters.

[0008] S4 width expansion formula calculation: Calculate the actual material pattern area f1 using the above values, and calculate the deviation standard between f1 and f using the formula, adjust and determine the final elliptical hole shape.

[0009] Preferably, the parameters of the elliptical hole include the radius R of the elliptical hole, the height h of the elliptical hole, the width Bk of the hole, the chamfer r at the arc of the elliptical hole, the roll gap value s of the elliptical hole, and the width b of the material.

[0010] Preferably, the data parameters include the area F of the previous pass material, the elongation coefficient μ of this pass, the average height of the material entering this pass material, the width of the previous pass material, the average height h of the rolled piece after rolling, the chamfer r coefficient at the arc, the reciprocal of the reduction coefficient η, the cross-sectional shape coefficient δ of the rolled piece, and the working roll diameter D of the roll.

[0011] Preferably, the theoretical area f of the material in this pass is equal to the area F of the material in the previous pass and the elongation coefficient μ of this pass, wherein the elongation coefficient μ of this pass is 1.15-1.4.

[0012] Preferably, the step of S3, which presets parameter values ​​and plots them, specifically includes the following steps:

[0013] S31: Preset height H of the elliptical hole, H = average height of material entering this pass * (0.7-0.9);

[0014] S32: Preset the width B of the elliptical hole, B = width of the previous material * (1.2-1.5);

[0015] S33: Preset roll gap value s for elliptical die type, s = (0.2-0.3)h, where h is the average height of the workpiece after rolling;

[0016] S34: Preset chamfer r at the arc of the elliptical hole, r = (0.08-0.12)*Bk, Bk = (1.05-1.1)*B;

[0017] S35: Draw an elliptical hole shape using computer drawing software based on the above data. The computer drawing software will automatically generate a hole shape diagram, and the radius R of the arc will be automatically given in the drawn hole shape diagram.

[0018] Preferably, the S4 width expansion formula calculation specifically includes the following steps:

[0019] S41: According to the expansion formula b=β*B, β=η -W W=10 -1.269*δ*(ε∧0.556) (∧ represents the power sign), calculate the width b of the material shape, where,

[0020] η is the reciprocal of the reduction coefficient, η = h / H; the ratio of the average height of the workpiece after rolling to the average height before rolling;

[0021] δ is the cross-sectional shape factor of the rolled piece, δ=B / H, which is the ratio of the average width to the average height of the rolled piece before rolling;

[0022] ε = H / D, the ratio of the average height of the workpiece before rolling to the working roll diameter;

[0023] S42: The material pattern diagram for this pass is formed from the material pattern width b in S41. The actual material pattern area f1 formed in the material pattern diagram is calculated by computer software. The deviation standard between f1 and f is defined, and the width of material pattern b is determined. If f1>f, the height h of the rolled piece after rolling is reduced. If f1<f, the height h of the rolled piece after rolling is increased until the difference between f1 and f is within the predetermined range.

[0024] Preferably, step S42 specifically includes the following steps:

[0025] S421: When f1 > f, and (f1-f) / f*100% is between 0.05% and 2%, or f1 < f, and (f-f1) / f*100% is between 0.05% and 2%, then determine the width b of the material type;

[0026] S422: When f1 > f, and (f1-f) / f*100% is not within the range of 0.05%-2%, then h is adjusted to [1-(0.0001~0.05)]h;

[0027] When f1 < f, and (f-f1) / f*100% is not within the range of 0.05%-2%, then h is adjusted to [1+(0.0001~0.05)]h;

[0028] S423: Substitute the adjusted h from S422 into S41, recalculate and obtain the actual material pattern area f1 formed in the material pattern diagram, and repeat steps S421 and S422 sequentially until f1 and f meet the deviation standard of f1 and f in S421, and determine the width b of the material pattern.

[0029] Preferably, the drawing program includes a parameter input module, a calculation module, a generation module, a drawing module, and a database module. The database module stores a data table of the average height of the material entering this pass in history, a data table of the width of the material entering this pass in history, and a data table of the average height of the rolled piece in history. Each of these data tables has a corresponding coefficient mapping table.

[0030] The workflow of a drawing program includes the following steps:

[0031] Input the average height of the material entering this pass, the width of the material in the previous pass, and the average height of the rolled piece after rolling into the parameter input module;

[0032] The calculation module's data mapping file automatically extracts the coefficient values ​​corresponding to the average height of the material entering this pass, the width of the material in the previous pass, and the average height of the rolled piece after rolling, and obtains the corresponding calculation results.

[0033] The generation module automatically generates the designated points for drawing;

[0034] The drawing module draws based on the location of the determined points.

[0035] Preferably, the shape of the elliptical hole is simplified, specifically as follows:

[0036] Obtain the shape images of the elliptical aperture at different depths of field;

[0037] The shape images of the elliptical aperture under different depths of field are fused and processed to obtain the shape outline of the elliptical aperture.

[0038] Determine the descriptive factors of multiple protruding points of the elliptical hole type based on the contour parameters corresponding to the shape contour;

[0039] The equivalent contour shape geometry of the elliptical aperture is determined based on the descriptor of multiple protruding points of the elliptical aperture.

[0040] The curvature variation rules of the elliptical aperture are determined using the equivalent contour shape geometry information.

[0041] An elliptical aperture visual image is constructed based on the curvature variation rules and equivalent contour shape geometry information;

[0042] An adaptive curvature calculation is performed on the visual image. Based on the calculation result, it is determined whether the ellipse shape corresponding to the visual image meets the standard. If not, the adjustment curvature is calculated, and the visual image is adaptively adjusted according to the adjustment curvature to obtain the adjusted visual image.

[0043] Divide the adjusted visual image into a view grid and obtain the division results;

[0044] The grid distribution in the adjusted visual image is determined based on the partitioning results, and a suitable target simplification operator is selected based on the grid distribution.

[0045] The adjusted visual image is simplified using the target simplification operator to obtain multiple first simplification results;

[0046] Based on each first simplification result, a view grid sequence within the first simplification region is determined, edge detection is performed on the view grid sequence within each first simplification region, and a first visual weight value for each first simplification region is determined based on the detection results.

[0047] Determine whether the first visual weight value within each first simplified region of each first simplified result is greater than or equal to a preset threshold, and select the second simplified result whose first visual weight value within each first simplified region is greater than or equal to the preset threshold;

[0048] The local visual display factor of the second simplified region is determined based on the second visual weight value within each second simplified region in each second simplified result;

[0049] All local visual display factors in each second simplified result are integrated, and error detection is performed on the integrated result to obtain the reconstruction error;

[0050] The third simplified result with a reconstruction error less than or equal to the preset error threshold is confirmed as the shape simplification result of the elliptical hole.

[0051] Preferably, after obtaining the basic parameters, the following is also included:

[0052] Obtain the geometric feature data of the elliptical aperture based on the aforementioned basic parameters;

[0053] The geometric feature data is input into a pre-constructed first-order aperture baseline model to determine the first quantitative relationship between the basic parameters of the elliptical aperture and its own geometric shape;

[0054] The geometric feature data is input into a pre-constructed second-order aperture baseline model to determine the second quantization relationship between the basic parameters of the elliptical aperture and its internal structural parameters.

[0055] The calibration parameters for the elliptical aperture are determined based on the first quantization relationship and the second quantization relationship.

[0056] Determine the parameter characteristics corresponding to the calibration parameters of the elliptical aperture type;

[0057] The cost function of the parameter to be calibrated is determined based on the characteristics of the parameter.

[0058] The synchronization parameter delay component of the parameter to be calibrated is calculated using the cost function.

[0059] The parameter deviation of the parameter to be calibrated is determined based on the synchronization parameter delay component of the parameter to be calibrated, and the calibration value of the parameter to be calibrated is determined based on the parameter deviation.

[0060] Based on the standard model parameters of the elliptical aperture, the parameter calibration rules for the elliptical aperture are determined.

[0061] The calibration value is adjusted according to the parameter calibration rules to obtain the adjusted calibration value;

[0062] The calibrated parameters of the elliptical aperture are calibrated using the adjusted calibration values, and then written into the computer software program after calibration.

[0063] Compared with the prior art, the beneficial effects of the present invention are:

[0064] 1. The present invention proposes a design method for an elliptical rolling pass. After determining the output parameters of the pass, the parameter calculation formula of the elliptical pass is determined. By obtaining the data parameters of the material before and after rolling through previous rolling records or practical experience, the calculation formula between the data parameters is obtained. The computer software is used to write the program, and three parts of Lisp code are designed: a drawing program, an area calculation program, and a loop calculation program. The relevant parameters are set, and the calculation is automatic, which is fast and accurate, avoiding the frequent and complicated manual calculation process.

[0065] 2. The present invention proposes a design method for an elliptical rolling mill die. The height H, width B, roll gap s, and chamfer r at the arc of the elliptical die are all set based on real experience or historical data. The drawing program automatically extracts the coefficient values ​​corresponding to the specific values ​​of each parameter and calculates the relevant preset values, thereby reducing errors and achieving high accuracy.

[0066] 3. The present invention proposes a design method for an elliptical rolling mill die. The elliptical die is drawn using computer-aided design software. The arc radius R is automatically given in the drawn die diagram. The actual material area f1 is calculated using the width expansion formula. The error is reduced through iterative calculation. The final elliptical die is adjusted and determined. The drawing is repeatedly redrawn to form a region and the area is calculated. The calculation is accurate and has high precision. Attached Figure Description

[0067] Figure 1 This is a flowchart of the design method for the elliptical rolling mill die of the present invention;

[0068] Figure 2This is an elliptical die diagram of the design method for the elliptical die of the steel rolling mill of the present invention;

[0069] Figure 3 This is a drawing of the rolled stock shape for the design method of the elliptical roll pass of the present invention;

[0070] Figure 4 This is a diagram showing the changes in material shape during the calculation of the area calculation program of this invention. Detailed Implementation

[0071] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0072] Please see Figures 1-4 A method for designing an elliptical roll pass for steel rolling, comprising the following steps:

[0073] S1 determines the output parameters of the elliptical hole: The shape of the elliptical hole is simplified, and the parameters of the elliptical hole are determined. The calculation formula for the parameters of the elliptical hole is determined. The parameters of the elliptical hole include the radius of the arc R of the elliptical hole, the height h of the elliptical hole, the width Bk of the hole, the chamfer r at the arc of the elliptical hole, the roll gap value s of the elliptical hole, and the width b of the material. A unique elliptical hole can be determined by the radius of the arc R of the elliptical hole, the height h of the elliptical hole, the width Bk of the hole, the chamfer r at the arc of the elliptical hole, the roll gap value s of the elliptical hole, and the width b of the material.

[0074] S2 Acquisition of Basic Parameters: Through past rolling records or practical experience, data parameters of the material shape before and after rolling are obtained. These data parameters include the area F of the material shape in the previous pass, the elongation coefficient μ of the current pass, the average height of the material shape entering this pass, the width of the material shape in the previous pass, the average height h of the rolled piece after rolling, the chamfer r coefficient at the arc, the reciprocal of the reduction coefficient η, the cross-sectional shape coefficient δ of the rolled piece, and the working roll diameter D of the roll. These data parameters are summarized and calculated. Based on historical data and practical experience, different data are classified and processed to obtain the calculation formulas between the data. The calculation formulas are verified by proof by contradiction to improve their accuracy. A computer software program is then written.

[0075] The computer software program consists of three parts: a drawing program, an area calculation program, and a loop calculation program. The drawing program includes a parameter input module, a calculation module, a generation module, a drawing module, and a database module. The database module stores data tables of the average height of the material entering this pass in history, the width of the material in the past passes, and the average height of the rolled piece in history. Each of these data tables has a corresponding coefficient mapping table.

[0076] Taking the historical average height data of this material type as an example:

[0077] Obtain at least one average height data table for entering this pass type, obtain data stored in at least one field of the average height data table for entering this pass type, and the average height data table for entering this pass type stores a coefficient value corresponding to the height of a single entry into this pass type related to the average height of entering this pass type.

[0078] Based on the meaning of the same field in the average height data table for different material types entering this pass, the corresponding mapping relationship is adjusted in advance to determine the mapping relationship between the average height data table for this material type entering this pass and different coefficient values.

[0079] Obtain the mapping relationship between the fields in the average height data table of the material entering this pass and the pre-configured table fields. The mapping relationship includes a one-to-one relationship or a one-to-many relationship between the fields in the average height data table of the material entering this pass and different coefficient values.

[0080] Based on the mapping relationship, the data stored in the fields of the data table with different coefficient values ​​are mapped to the corresponding fields of the average height data table of the material entering this pass, thus obtaining a data model table with mapped data.

[0081] Save the average height data table for this material type with mapped data;

[0082] Based on the preset storage rules corresponding to the data in each field of the average height data table for this pass, detect the data stored in each field of the average height data table for this pass.

[0083] When abnormal data is detected in the average height data table of the material entering this pass according to the preset storage rules, the abnormal data is processed according to the preset processing method.

[0084] The processed data is processed according to a statistical software script with preset standards, and data labels are automatically generated with one click. The data labels are used to train the statistical model corresponding to the statistical software script.

[0085] Calculate the theoretical area f of the material type in this pass. The theoretical area f of the material type in this pass = the area F of the material type in the previous pass / the extension coefficient μ of this pass. The extension coefficient μ of this pass is 1.15-1.4.

[0086] S3 Preset Parameter Values ​​and Draw: Using the parameter calculation formula for the elliptical hole, based on the determined data parameters, preset the parameters of the elliptical hole, and draw the elliptical hole shape using computer drawing software based on the preset elliptical hole parameters. Specifically, this includes the following steps:

[0087] S31: Preset height H of the elliptical hole, H = average height of material entering this pass * (0.7-0.9);

[0088] S32: Preset the width B of the elliptical hole, B = width of the previous material * (1.2-1.5);

[0089] S33: Preset roll gap value s for elliptical die type, s = (0.2-0.3)h, where h is the average height of the workpiece after rolling;

[0090] S34: Preset the chamfer r at the arc of the elliptical hole, r = (0.08-0.12)*Bk, Bk = (1.05-1.1)*B. The workflow of the drawing program includes the following steps:

[0091] Input the average height of the material entering this pass, the width of the material in the previous pass, and the average height of the workpiece after rolling into the parameter input module;

[0092] The calculation module's data mapping file automatically extracts the coefficient values ​​corresponding to the average height of the material entering this pass, the width of the material in the previous pass, and the average height of the rolled piece after rolling, and obtains the corresponding calculation results.

[0093] The generation module automatically generates the designated points for drawing;

[0094] The drawing module draws based on the location of the determined points.

[0095] Drawing code in the drawing program:

[0096] (setq p1(list(+xc b1 / 2)(+yc(*0.5s))); The point on the right side of the upper half of the hole.

[0097] p2(list xc(+yc h / 2)); The point on the right side of the groove bottom of the upper half of the hole (the intersection of the extended outlines).

[0098] p3(list(-xc b1 / 2)(+yc s / 2))); The point on the left side of the upper half of the hole.

[0099] (setq p4(polar p1 0(*1.2r1)); End point of the right roll gap in the upper half of the die.

[0100] p5(polar p3 pi(*1.2r1))); End point of the left roller gap in the upper half of the die.

[0101] (vl-load-com)

[0102] (command "arc" p1 p2 p3); Draw a circular arc shape for the hole.

[0103] S35: Draw the elliptical hole shape using computer-aided design software based on the above data. The computer-aided design software will automatically generate the hole shape diagram, and the arc radius R will be automatically given in the drawn hole shape diagram. There is no need to manually calculate the arc radius R. The calculation formula for manually calculating the arc radius R is as follows: R = ((hs) 2 +BK 2 ) / (4*(HS));

[0104] S4 width expansion formula calculation: Calculate the actual material shape area f1 using the above values.

[0105] Part of the code for calculating the area in the area calculation program:

[0106] (command"region"e1 e2 e3 e4 e5 e6 e7 e8""); This creates a region, where e1 to e8 are the graphic names of the edges of the material.

[0107] (setqee(entlast)); Get the image name

[0108] (setqf1(vlax-get-property(vlax-ename->vla-object ee)'area)); Get the area.

[0109] The deviation standard between f1 and f is calculated using a formula, and the final elliptical hole shape is adjusted and determined. The specific steps include:

[0110] S41: According to the expansion formula b=β*B, β=η -W W=10 -1.269*δ*(ε∧0.556) (∧ represents the power sign), calculate the width b of the material shape, where,

[0111] η is the reciprocal of the reduction coefficient, η = h / H; the ratio of the average height of the workpiece after rolling to the average height before rolling;

[0112] δ is the cross-sectional shape factor of the rolled piece, δ=B / H, which is the ratio of the average width to the average height of the rolled piece before rolling;

[0113] ε = H / D, the ratio of the average height of the rolled piece before rolling to the working roll diameter of the rolling mill;

[0114] S42: Form the stock shape diagram of this pass from the stock shape width b in S41, calculate the actual stock shape diagram area f1 formed in this stock shape diagram through computer software, define the deviation standard between f1 and f, determine the width of the stock shape b. If f1 > f, reduce the height h of the rolled piece after rolling. If f1 < f, increase the height h of the rolled piece after rolling until the difference between f1 and f is within the predetermined range.

[0115] S42 specifically includes the following steps:

[0116] S421: When f1 > f and (f1 - f) / f * 100% is between 0.05% and 2%, or f1 < f and (f - f1) / f * 100% is between 0.05% and 2%, determine the width b of the stock shape;

[0117] S422: When f1 > f and (f1 - f) / f * 100% is not within the range of 0.05% - 2%, adjust h to [1 - (0.0001 - 0.05)]h;

[0118] When f1 < f and (f - f1) / f * 100% is not within the range of 0.05% - 2%, adjust h to [1 + (0.0001 - 0.05)]h;

[0119] S423: Substitute the adjusted h in S422 into S41, recalculate to obtain the actual stock shape diagram area f1 formed in this stock shape diagram, and sequentially repeat the steps of S421 and S422 until f1 and f meet the deviation standard of f1 and f in S421, and determine the width b of the stock shape.

[0120] The loop calculation program performs loop calculations until the stock shape area and the required area meet the requirements

[0121] (while(>(abs(-f f1))differarea); differarea is the allowable deviation value between f and f1 (generally 0.05 - 2%, the smaller the value, the higher the calculation accuracy)

[0122] (if(<f f1)(setqh(-hhh)); hh is the height adjustment value (it can be set that hh = 0.0001 - 0.05 * h)

[0123] (setqh(+hhh)))

[0124] -----------

[0125] (command "region "e1 e2 e3 e4 e5 e6 e7 e8"); Redraw to form the region.

[0126] (setqee(entlast))

[0127] (setq area(vlax-get-property(vlax-ename->vla-object ee)'area))); Recalculate the area.

[0128] In summary, this design method for elliptical rolling mill passes determines the output parameters of the pass, establishes the calculation formulas for these parameters, and obtains data parameters of the material before and after rolling based on past rolling records or practical experience. The calculation formulas between these data parameters are then derived. Computer software is used to write the program, designing three parts of LISP code: a drawing program, an area calculation program, and a loop calculation program. With relevant parameters set, the program automatically calculates the parameters, resulting in high speed and accuracy, avoiding frequent and complex manual calculations. The method presets the height H, width B, and other parameters of the elliptical rolling mill pass. The roll gap value s for the circular hole and the chamfer r at the arc of the preset elliptical hole are set based on real-world experience or historical data. The drawing program automatically extracts the coefficient values ​​corresponding to the specific values ​​of each parameter, calculates the relevant preset values, reduces errors, and achieves high accuracy. The elliptical hole is drawn using computer drawing software, and the arc radius R is automatically given in the drawn hole drawing. The actual material shape area f1 is calculated using the width expansion formula. Through iterative calculation, the error is reduced, the final elliptical hole is adjusted and determined, and the drawing is repeatedly redrawn to form a region and calculate the area. The calculation is accurate and has high precision.

[0129] In one embodiment, the shape of the elliptical hole is simplified as follows:

[0130] Obtain the shape images of the elliptical aperture at different depths of field;

[0131] The shape images of the elliptical aperture under different depths of field are fused and processed to obtain the shape outline of the elliptical aperture.

[0132] Determine the descriptive factors of multiple protruding points of the elliptical hole type based on the contour parameters corresponding to the shape contour;

[0133] The equivalent contour shape geometry of the elliptical aperture is determined based on the descriptor of multiple protruding points of the elliptical aperture.

[0134] The curvature variation rules of the elliptical aperture are determined using the equivalent contour shape geometry information.

[0135] An elliptical aperture visual image is constructed based on the curvature variation rules and equivalent contour shape geometry information;

[0136] An adaptive curvature calculation is performed on the visual image. Based on the calculation result, it is determined whether the ellipse shape corresponding to the visual image meets the standard. If not, the adjustment curvature is calculated, and the visual image is adaptively adjusted according to the adjustment curvature to obtain the adjusted visual image.

[0137] Divide the adjusted visual image into a view grid and obtain the division results;

[0138] The grid distribution in the adjusted visual image is determined based on the partitioning results, and a suitable target simplification operator is selected based on the grid distribution.

[0139] The adjusted visual image is simplified using the target simplification operator to obtain multiple first simplification results;

[0140] Based on each first simplification result, a view grid sequence within the first simplification region is determined, edge detection is performed on the view grid sequence within each first simplification region, and a first visual weight value for each first simplification region is determined based on the detection results.

[0141] Determine whether the first visual weight value within each first simplified region of each first simplified result is greater than or equal to a preset threshold, and select the second simplified result whose first visual weight value within each first simplified region is greater than or equal to the preset threshold;

[0142] The local visual display factor of the second simplified region is determined based on the second visual weight value within each second simplified region in each second simplified result;

[0143] All local visual display factors in each second simplified result are integrated, and error detection is performed on the integrated result to obtain the reconstruction error;

[0144] The third simplified result with a reconstruction error less than or equal to the preset error threshold is confirmed as the shape simplification result of the elliptical hole.

[0145] In this embodiment, the multiple protrusions are represented as multiple protrusions of an elliptical hole shape;

[0146] In this embodiment, the descriptive factor is represented as a relative position description and an absolute position description of the protrusion;

[0147] In this embodiment, the equivalent contour shape geometric information is represented as the geometric information equivalent to the first contour formed by connecting protruding points and the shape contour;

[0148] In this embodiment, the curvature variation rule is expressed as the curvature variation rule of the surface with an equal area cross section of an elliptical aperture;

[0149] In this embodiment, the visual image is represented as the image corresponding to the front view of the elliptical hole.

[0150] In this embodiment, the adjustment curvature is expressed as the difference between the curvature of the standard elliptical surface and the current surface curvature;

[0151] In this embodiment, the grid distribution is represented by the grid tiling in the adjusted visual image;

[0152] In this embodiment, the target simplification operator is retrieved from a preset database based on the mesh tiling situation, which corresponds to the simplification method and the simplified shape distribution;

[0153] In this embodiment, edge detection is represented as performing sequence factor integrity detection on the edge of the grid sequence;

[0154] In this embodiment, the first visual weight value represents the ratio of the sharpness of each first simplified region at each viewing angle to a preset sharpness.

[0155] In this embodiment, the preset threshold can be 0.9;

[0156] In this embodiment, the second simplification result is obtained by filtering from the first simplification result;

[0157] In this embodiment, the local visual display factor is represented as the local visual display degree correlation factor of the second simplified region;

[0158] In this embodiment, the reconstruction error is represented as the shape error between the reconstructed second simplified result and the original visual image;

[0159] In this embodiment, the preset error threshold can be 0.03;

[0160] The working principle of the above technical solution is as follows: First, the shape outline of the elliptical aperture is determined based on the depth image of the elliptical aperture. Then, the geometric information of the equivalent outline shape of the elliptical aperture is obtained based on the parameters corresponding to the shape outline, and its visual image is constructed. It is confirmed whether the visual image meets the shape standard of the standard ellipse. If it does not meet the standard, it is adjusted to obtain a standard reference visual image. Then, the visual image is simplified by selecting the appropriate simplification operator through grid division. The simplification result is filtered by view weight and reconstruction in multiple dimensions to obtain the final third simplification result as the shape simplification result of the elliptical aperture.

[0161] The beneficial effects of the above technical solution are as follows: by constructing a visual image of an elliptical aperture and adaptively adjusting it, the visual image can be guaranteed to conform to the essential shape of an ellipse, providing an accurate reference sample for subsequent simplification and improving practicality. Furthermore, by using mesh partitioning to select an appropriate simplification operator, the best simplification operator can be selected based on the mesh distribution of the elliptical aperture, ensuring the feasibility and practicality of the simplification result and improving stability. Furthermore, by performing multi-dimensional screening on the simplification result, errors can be minimized, ensuring the visual effect and reconstruction effect of the simplified region, making the simplification result more convincing and objective.

[0162] In one embodiment, after obtaining the basic parameters, the method further includes:

[0163] Obtain the geometric feature data of the elliptical aperture based on the aforementioned basic parameters;

[0164] The geometric feature data is input into a pre-constructed first-order aperture baseline model to determine the first quantitative relationship between the basic parameters of the elliptical aperture and its own geometric shape;

[0165] The geometric feature data is input into a pre-constructed second-order aperture baseline model to determine the second quantization relationship between the basic parameters of the elliptical aperture and its internal structural parameters.

[0166] The calibration parameters for the elliptical aperture are determined based on the first quantization relationship and the second quantization relationship.

[0167] Determine the parameter characteristics corresponding to the calibration parameters of the elliptical aperture type;

[0168] The cost function of the parameter to be calibrated is determined based on the characteristics of the parameter.

[0169] The synchronization parameter delay component of the parameter to be calibrated is calculated using the cost function.

[0170] The parameter deviation of the parameter to be calibrated is determined based on the synchronization parameter delay component of the parameter to be calibrated, and the calibration value of the parameter to be calibrated is determined based on the parameter deviation.

[0171] Based on the standard model parameters of the elliptical aperture, the parameter calibration rules for the elliptical aperture are determined.

[0172] The calibration value is adjusted according to the parameter calibration rules to obtain the adjusted calibration value;

[0173] The calibrated parameters of the elliptical aperture are calibrated using the adjusted calibration values, and then written into the computer software program after calibration.

[0174] In this embodiment, the geometric feature data is represented as multi-angle geometric feature related display data of an elliptical aperture;

[0175] In this embodiment, the first-order aperture baseline model is represented as a quantized model of shape and parameters;

[0176] In this embodiment, the second-order aperture baseline model is represented as a quantitative model of parameters and structure;

[0177] In this embodiment, the parameter characteristics are represented as the fixed modification characteristics of the parameter to be calibrated;

[0178] In this embodiment, the synchronization parameter delay component is represented as the parameter calibration error component of the parameter to be calibrated;

[0179] In this embodiment, the standard model parameters are represented as the feature parameters under the standard model of the elliptical aperture.

[0180] The working principle of the above technical solution is as follows: First, the parameters to be calibrated for the elliptical aperture are determined based on the geometric feature data of the elliptical aperture and the preset aperture baseline model, confirming that calibration is required. Then, the synchronization parameter delay component is calculated based on the parameter characteristics and corresponding cost function of the parameters to be calibrated, and the parameter deviation is determined based on it. The calibration value of the parameters to be calibrated can be determined based on the parameter deviation. Then, the calibration value is adjusted using the parameter calibration rules of the elliptical aperture, and the parameters to be calibrated for the elliptical aperture are calibrated using the adjusted calibration value.

[0181] The beneficial effects of the above technical solution are as follows: by calibrating the irregular parameters in the basic parameters, the rationality and accuracy of the basic parameter data can be guaranteed, laying the foundation for subsequent drawing and area calculation, and improving practicality. Furthermore, by adjusting the correction value, it can be ensured that it conforms to the standard parameters of the elliptical hole type, making the adjusted parameters more reasonable, and further improving practicality and reliability.

[0182] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A design method for an elliptical rolling mill die, characterized in that, Includes the following steps: S1 determines the aperture output parameters: obtains the shape images of the elliptical aperture at different depths of field; The shape images of the elliptical aperture under different depths of field are fused and processed to obtain the shape outline of the elliptical aperture. Determine the descriptive factors of multiple protruding points of the elliptical hole type based on the contour parameters corresponding to the shape contour; The equivalent contour shape geometry of the elliptical aperture is determined based on the descriptor of multiple protruding points of the elliptical aperture. The curvature variation rules of the elliptical aperture are determined using the equivalent contour shape geometry information. An elliptical aperture visual image is constructed based on the curvature variation rules and equivalent contour shape geometry information; An adaptive curvature calculation is performed on the visual image. Based on the calculation result, it is determined whether the ellipse shape corresponding to the visual image meets the standard. If not, the adjustment curvature is calculated, and the visual image is adaptively adjusted according to the adjustment curvature to obtain the adjusted visual image. Divide the adjusted visual image into a view grid and obtain the division results; The grid distribution in the adjusted visual image is determined based on the division results, and an appropriate target simplification operator is selected based on the grid distribution. The target simplification operator is an algorithm rule predefined based on grid density and curvature changes, used to merge or simplify the view grid. The adjusted visual image is simplified using the target simplification operator to obtain multiple first simplification results; Based on each first simplification result, a view grid sequence within the first simplification region is determined. Edge detection is performed on the view grid sequence within each first simplification region. Based on the detection results, a first visual weight value for each first simplification region is determined. The first visual weight value is obtained by comprehensively calculating the edge sharpness of the region, the rate of change of contour curvature, and the proportion of the area of ​​the region to the total area of ​​the visual image. Determine whether the first visual weight value within each first simplified region of each first simplified result is greater than or equal to a preset threshold, and select the second simplified result whose first visual weight value within each first simplified region is greater than or equal to the preset threshold; The local visual display factor of the second simplified region is determined based on the second visual weight value within each second simplified region in each second simplified result. The local visual display factor is used to quantify the relative importance of the simplified region in the overall simplified visual expression. All local visual display factors in each second simplified result are integrated, and error detection is performed on the integrated result to obtain the reconstruction error; The third simplified result with a reconstruction error less than or equal to the preset error threshold is confirmed as the shape simplification result of the elliptical aperture. The parameters of the elliptical hole are defined, including the radius R of the elliptical hole, the height h of the elliptical hole, the width Bk of the hole, the chamfer r at the arc of the elliptical hole, the roll gap value s of the elliptical hole, and the width b of the material. The calculation formula for the parameters of the elliptical hole is determined. S2 Obtain basic parameters: Based on past rolling records or practical experience, obtain data parameters of the material shape before and after rolling, and summarize and calculate these data parameters. The data parameters include the area F of the material shape in the previous pass, the elongation coefficient μ of the current pass, the average height of the material shape entering this pass, the width of the material shape in the previous pass, and the average height h of the rolled piece after rolling. Write a computer software program to calculate the theoretical area f of the material shape in this pass. The computer software program includes three parts: a drawing program, an area calculation program, and a loop calculation program. The theoretical area f of the material shape in this pass = the area F of the material shape in the previous pass / the elongation coefficient μ of the current pass. The elongation coefficient μ of the current pass is 1.15-1.

4. S3 Preset Parameter Values ​​and Draw: Using the parameter calculation formula for the elliptical hole, based on the determined data parameters, preset the parameters of the elliptical hole, and draw the elliptical hole shape using computer drawing software based on the preset elliptical hole parameters. Specifically, this includes the following steps: S31: Preset height H of the elliptical hole, H = average height of material entering this pass * (0.7-0.9). S32: Preset the width B of the elliptical hole, B = width of the previous material * (1.2-1.5). S33: Preset roll gap value s for elliptical die type, s = (0.2-0.3)h, where h is the average height of the workpiece after rolling; S34: Preset chamfer r at the arc of the elliptical hole, r = (0.08-0.12) * Bk, Bk = (1.05-1.1) * B; S35: Draw an elliptical hole shape using computer drawing software based on the above data. The computer drawing software will automatically generate a hole shape diagram, and the radius R of the arc will be automatically given in the drawn hole shape diagram. S4 width expansion formula calculation: Calculate the actual material pattern area f1 using the above values, and calculate the deviation standard between f1 and f using the formula. Adjust and determine the final elliptical hole shape, specifically including the following steps: S41: According to the expansion formula b=β*B, β=η -W W=10 -1.269*δ*(ε∧0.556) ∧ represents the sign of the exponentiation. Calculate the width b of the material shape, where... η is the reciprocal of the reduction coefficient, η=h / H; the ratio of the average height of the workpiece after rolling to the average height before rolling; δ is the cross-sectional shape factor of the rolled piece, δ=B / H, which is the ratio of the average width to the average height of the rolled piece before rolling; ε = H / D, the ratio of the average height of the workpiece before rolling to the working roll diameter; S42: Based on the material width b in S41, a material pattern diagram for this pass is formed. The actual material pattern area f1 formed in this diagram is calculated using computer software. A deviation standard between f1 and f is defined, and the width of material b is determined. If f1 > f, the height h of the rolled piece after rolling is reduced; if f1 < f, the height h of the rolled piece after rolling is increased, until the difference between f1 and f is within a predetermined range. Specifically, this includes the following steps: S421: When f1 > f, and (f1-f) / f*100% is between 0.05% and 2%, or f1 < f, and (f-f1) / f*100% is between 0.05% and 2%, then determine the width b of the material type; S422: When f1 > f, and (f1-f) / f*100% is not within the range of 0.05%-2%, then h is adjusted to [1-(0.0001~0.05)]h; When f1 < f, and (f-f1) / f*100% is not within the range of 0.05%-2%, then h is adjusted to [1+(0.0001~0.05)]h; S423: Substitute the adjusted h from S422 into S41, recalculate and obtain the actual material pattern area f1 formed in the material pattern diagram, and repeat steps S421 and S422 sequentially until f1 and f meet the deviation standard of f1 and f in S421, and determine the width b of the material pattern.

2. The design method for an elliptical rolling mill die as described in claim 1, characterized in that: The drawing program includes a parameter input module, a calculation module, a generation module, a drawing module, and a database module. The database module stores a data table of the average height of the material entering this pass in history, a data table of the width of the material entering this pass in history, and a data table of the average height of the rolled piece in history. Each of these data tables has a corresponding coefficient mapping table. The workflow of a drawing program includes the following steps: Input the average height of the material entering this pass, the width of the material in the previous pass, and the average height of the rolled piece after rolling into the parameter input module; The calculation module's data mapping file automatically extracts the coefficient values ​​corresponding to the average height of the material entering this pass, the width of the material in the previous pass, and the average height of the rolled piece after rolling, and obtains the corresponding calculation results. The generation module automatically generates the designated points for drawing; The drawing module draws based on the location of the determined points.

3. The design method for an elliptical rolling mill die as described in claim 1, characterized in that: After obtaining the basic parameters, it also includes: Obtain the geometric feature data of the elliptical aperture based on the aforementioned basic parameters; The geometric feature data is input into a pre-constructed first-order aperture baseline model to determine the first quantitative relationship between the basic parameters of the elliptical aperture and its own geometric shape; The geometric feature data is input into a pre-constructed second-order aperture baseline model to determine the second quantization relationship between the basic parameters of the elliptical aperture and its internal structural parameters. The calibration parameters for the elliptical aperture are determined based on the first quantization relationship and the second quantization relationship. Determine the parameter characteristics corresponding to the calibration parameters of the elliptical aperture type; The cost function of the parameter to be calibrated is determined based on the characteristics of the parameter. The synchronization parameter delay component of the parameter to be calibrated is calculated using the cost function. The parameter deviation of the parameter to be calibrated is determined based on the synchronization parameter delay component of the parameter to be calibrated, and the calibration value of the parameter to be calibrated is determined based on the parameter deviation. Based on the standard model parameters of the elliptical aperture, the parameter calibration rules for the elliptical aperture are determined. The calibration value is adjusted according to the parameter calibration rules to obtain the adjusted calibration value; The calibrated parameters of the elliptical aperture are calibrated using the adjusted calibration values, and then written into the computer software program after calibration.

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