Goods shelf stand column cold roll forming equipment and anti-bending roller shape design method

Abstract

The invention discloses goods shelf stand column cold roll forming equipment and an anti-bending roller shape design method, and relates to the field of cold roll forming. The goods shelf stand column cold roll forming equipment comprises a rack, an uncoiling device, a feeding device, a guiding device, a forming device, a gear motor, an anti-bending device, a correcting device and a shearing device; the uncoiling device is positioned at the front end of the rack; the feeding device, the guiding device, the forming device, the gear motor, the anti-bending device, the correcting device and the shearing device are all installed on the rack. The guiding device is connected with the feeding device and located on the rear side of the feeding device. The forming device is positioned behind the guide device; the gear motor is arranged in the middle of the rack. According to the goods shelf stand column cold roll forming equipment and the anti-bending roller shape design method, the equipment structure is simple, the cost is low, the method breaks through a traditional trial and error mode, precise optimization of roller parameters is achieved through functional modeling, the debugging cost is remarkably reduced, the flatness of a goods shelf stand column web is improved, and the important engineering application value is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cold bending forming, and particularly relates to a cold bending forming device for a shelf column and a design method for the roll profile of a reverse bending roll. Background Art

[0002] A shelf column is a structural plate with a special cross-sectional profile, which can present various complex cross-sectional forms such as Z-shaped or U-shaped. Due to the relatively complex cross-section of the shelf column, it is very necessary to design a device for processing the shelf column. In addition, during the cold rolling process of the shelf column, a crown defect is likely to occur at the web position, that is, a local convex or concave deformation along the plate thickness direction.

[0003] To solve this defect, during design and actual processing, a reverse bending pass is added during the cold rolling process. However, the design of the cross-sectional bending degree of the upper and lower reverse bending rolls in the reverse bending pass depends on experience, and continuous trial-and-error experiments will greatly waste time and economic costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a cold bending forming device for a shelf column and a design method for the roll profile of a reverse bending roll. The device has a simple structure and low cost. The method breaks through the traditional trial-and-error mode, realizes precise optimization of roll parameters through functional modeling, significantly reduces the debugging cost, improves the flatness of the web of the shelf column, and has important engineering application value.

[0005] The present invention provides a cold bending forming device for a shelf column and a design method for the roll profile of a reverse bending roll, including a frame, an uncoiling device, a feeding device, a guiding device, a forming device, a reduction motor, a reverse bending device, a correcting device, and a shearing device; the uncoiling device is located at the front end of the frame; the feeding device, the guiding device, the forming device, the reduction motor, the reverse bending device, the correcting device, and the shearing device are all installed on the frame; the guiding device is connected to the feeding device and is located behind the feeding device; the forming device is located behind the guiding device; the reduction motor is arranged in the middle of the frame; the reverse bending device is located behind the forming device and is connected to the forming device; the correcting device is arranged behind the reverse bending device; the shearing device is located behind the correcting device.

[0006] Preferably, the feeding device includes a feeding roller and a feeding panel, and the feeding roller is installed inside the feeding panel through bearings and bolts.

[0007] Preferably, the guiding device includes a guiding roller, a guiding frame, and a floating guiding mechanism, and the guiding roller is connected to the guiding frame through bearings and bolts.

[0008] Preferably, the forming device includes a forming roller, forming wallboards, a forming tile box, a transmission shaft, positioning angle seats, positioning blocks and positioning lead screws. The forming wallboards are symmetrically installed on both sides of the frame. The forming tile box is installed on the forming wallboards. The forming roller is installed on the transmission shaft. The transmission shaft is installed on the forming tile box through bearings, round nuts and round nut stop washers. The positioning blocks are installed on the symmetrically arranged forming wallboards on both sides. The positioning lead screws pass through the positioning blocks and are connected to the forming tile box. The positioning angle seats are provided with forming rollers and are connected to the forming wallboards.

[0009] Preferably, the correction device includes a correction frame, correction rollers, correction positioning angle seats, a correction transmission shaft, correction positioning lead screws, correction positioning blocks. The correction rollers are installed on the correction transmission shaft. The correction transmission shaft is installed on the correction positioning angle seats through bearings, round nuts and round nut stop washers. The correction positioning angle seats are installed on the correction frame. The correction positioning lead screws pass through the correction positioning blocks and are connected to the correction positioning angle seats.

[0010] Preferably, the shearing device includes a shearing frame, a shearing oil cylinder, a cutter and a tool holder. The shearing oil cylinder and the tool holder are installed on the shearing frame. The cutter is installed on the tool holder.

[0011] Preferably, it includes the following steps: Step S1: Use 3D modeling software to construct the original cold rolling model of the shelf column of the roller and the shelf column assembly; Input the web width B, plate thickness H and target cross-sectional shape parameters, and establish the original cold rolling model of the shelf column in the 3D modeling software. The cold rolling model of the shelf column includes a shelf column and a reverse bending roller. The reverse bending roller is divided into an upper reverse bending roller and a lower reverse bending roller. The normal clearance between the upper reverse bending roller and the lower reverse bending roller is equal to the plate thickness H of the sheet. The upper surface of the web of the shelf column is tangent to the upper reverse bending roller, and the lower surface of the web of the shelf column is tangent to the lower reverse bending roller. The web of the shelf column is placed in the middle of the reverse bending rollers at the horizontal symmetric position. Import the original cold rolling model of the shelf column into the finite element simulation software in step S2; Step S2: Set the upper reverse bending roller and the lower reverse bending roller as discrete rigid bodies, set the shelf column as a deformable body and endow it with material properties, define the contact properties between the roller and the shelf column, and create analysis steps, boundary conditions and element mesh settings; Step S3: Extract the normal coordinate data of the web of the shelf column after simulation, and draw the coordinate curve graph and the transverse plastic strain graph; Establish a plane coordinate system with the transverse cross-section of the shelf column after cold rolling as the reference: the x-axis is along the web width direction, and the y-axis is along the vertical edge height direction. Divide the transverse length L of the web into 2n + 1 nodes, extract the normal coordinate data of each node, and generate the web normal coordinate curve graph and the transverse plastic strain distribution graph based on the normal coordinate data of each node; Step S4: Calculate the integral value V of the transverse plastic strain graph, and judge whether the integral value V is within a reasonable range; Calculate the integral value V of the lateral plastic strain curve in the interval from 0 to L. Determine the defect type according to the sign of the V value: V > 0 indicates that the web is convex as a whole, V < 0 indicates that the web is concave as a whole. Set a qualified threshold q. If V satisfies 0 < |V| < q, then go to step S5; otherwise, jump to step S6 for optimization. q is the integral value standard required during actual processing. Step S5: Calculate the extreme value difference U of the coordinate curve graph, and judge whether the extreme value difference U is within a reasonable range. Divide the normal coordinate curve of the web into n intervals, calculate the extreme value difference U of the coordinate values within each interval, and judge the extreme value difference U. Set a qualified threshold p. If U < p, then output the final roll profile diagram; otherwise, jump to step S6 for optimization. p is the extreme value difference standard required during actual processing. Step S6: Optimize the shape parameters of the roll. Establish a reverse bending roll cross-section coordinate system: Take the direction of the center line of the lower reverse bending roll as the x` axis, and the direction perpendicular to the center line of the lower reverse bending roll on the side of the lower reverse bending roll as the y` axis. Establish the upper roll surface function G(x') and the lower roll surface function H(x') according to the roll surface profile. Calculate the curvature ka of the upper reverse bending roll and the curvature kb of the lower reverse bending roll through the upper reverse bending roll surface shape function G(x`) and the lower reverse bending roll surface shape function H(x`), and then obtain the curvature radii Ra = 1 / ka and Rb = 1 / kb, where ; ; Then calculate the curvature radii (Ra, Rb) of the upper and lower reverse bending rolls according to the curvatures (ka, kb) of the upper and lower reverse bending rolls. ; ; ; Adjust and improve the curvature radii (Ra, Rb) of the upper and lower reverse bending rolls; if input from step S4 to step S6, then make the following adjustments to the roll: Let the curvature radii of the upper and lower reverse bending rolls after adjustment be ( , ), where: ; ; If input from step S5 to step S6, then make the following adjustments to the roll: Let the curvature radii of the upper and lower reverse bending rolls after adjustment be ( , ), where: ; ; Step S7: Return the optimized curvature radius value to step S1 to update the model; re - execute the simulation and evaluation process from step S2 to step S5, and iterate cyclically until both the overall defect criterion 0 < |V| < q and the local flatness criterion U < p are satisfied. Finally, output the roll profile drawing of the bending rolls that meets the quality requirements.

[0012] Therefore, the present invention adopts the above - mentioned cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls. The equipment has a simple structure and low cost. The method breaks through the traditional trial - and - error mode, realizes the precise optimization of roll parameters through functional modeling, significantly reduces the debugging cost, and improves the flatness of the web of the shelf columns, having important engineering application value.

[0013] The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. Brief Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the equipment for the embodiment of the cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls of the present invention; Figure 2 It is a schematic diagram of the feeding device for the embodiment of the cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls of the present invention; Figure 3 It is a schematic diagram of the guiding device for the embodiment of the cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls of the present invention; Figure 4 It is a partial schematic diagram of the forming device for the embodiment of the cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls of the present invention; Figure 5 It is a schematic diagram of the correcting device for the embodiment of the cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls of the present invention; Figure 6 It is a schematic diagram of the shearing device for the embodiment of the cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls of the present invention; Figure 7 It is a flow chart for the embodiment of the cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls of the present invention; Figure 8 It is a schematic diagram of the initial three - dimensional model of the shelf column and the bending rolls for the embodiment of the cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls of the present invention; Figure 9 It is a schematic diagram of the rectangular coordinate system of the cross - section plane of the web after cold - rolling simulation in a specific embodiment of the cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls of the present invention; Figure 10 It is a normal coordinate curve graph of the web for the embodiment of the cold - bending forming equipment for shelf columns and the design method of the roll profile of the bending rolls of the present invention; Figure 11 The transverse plastic strain diagram of the web for the embodiment of a cold bending forming device for a shelf column and a design method for the roll profile of the reverse bending roll according to the present invention; Figure 12 The schematic diagram of the rectangular coordinate system during the optimization process of the upper and lower reverse bending rolls for the embodiment of a cold bending forming device for a shelf column and a design method for the roll profile of the reverse bending roll according to the present invention.

[0015] Reference numerals 1, frame; 2, uncoiler; 3, feeding device; 4, guiding device; 5, forming device; 6, reduction motor; 7, reverse bending device; 8, straightening device; 9, shearing device; 301, feeding idler; 302, feeding panel; 401, guiding idler; 402, guiding frame; 403, floating guiding mechanism; 501, forming roll; 502, forming wallboard; 503, forming tile box; 504, transmission shaft; 505, positioning angle seat; 506, positioning block; 507, positioning lead screw; 801, straightening frame; 802, straightening roll; 803, straightening positioning angle seat; 804, straightening transmission shaft; 805, straightening positioning lead screw; 806, straightening positioning block; 901, shearing frame; 902, shearing oil cylinder; 903, cutting tool; 904, tool holder. Detailed implementation manners

[0016] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention pertains.

[0018] The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0019] Embodiment 1 As Figures 1-12As shown in the figure, a cold bending forming device for a shelf column and a design method for the roll profile of a reverse bending roll in the present invention include a frame 1, an uncoiling device 2, a feeding device 3, a guiding device 4, a forming device 5, a reduction motor 6, a reverse bending device 7, a straightening device 8, and a shearing device 9; the uncoiling device 2 is located at the front end of the frame 1; the feeding device 3, the guiding device 4, the forming device 5, the reduction motor 6, the reverse bending device 7, the straightening device 8, and the shearing device 9 are all installed on the frame 1; the guiding device 4 is connected to the feeding device 3, and the guiding device 4 is located behind the feeding device 3; the forming device 5 is located behind the guiding device 4; the reduction motor 6 is arranged in the middle of the frame 1; the reverse bending device 7 is located behind the forming device 5, and the reverse bending device 7 is connected to the forming device 5; the straightening device 8 is arranged behind the reverse bending device 7; the shearing device 9 is located behind the straightening device 8.

[0020] The feeding device 3 includes a feeding roller 301 and a feeding panel 302, and the feeding roller 301 is installed inside the feeding panel 302 through bearings and bolts.

[0021] The guiding device 4 includes a guiding roller 401, a guiding frame 402, and a floating guiding mechanism 403, and the guiding roller 401 is connected to the guiding frame 402 through bearings and bolts.

[0022] The forming device includes forming rolls 501, forming wallboards 502, a forming tile box 503, a transmission shaft 504, positioning angle seats 505, positioning blocks 506, and positioning lead screws 507. The forming wallboards 502 are symmetrically installed on both sides of the frame 1, the forming tile box 503 is installed on the forming wallboards 502, the forming rolls 501 are installed on the transmission shaft 504, the transmission shaft 504 is installed on the forming tile box 503 through bearings, round nuts, and round nut stop washers, the positioning blocks 506 are installed on the symmetrically arranged forming wallboards 502 on both sides, the positioning lead screws 507 pass through the positioning blocks 506 and are connected to the forming tile box 503, the positioning angle seats 505 are provided with the forming rolls 501, and the positioning angle seats 505 are connected to the forming wallboards 502.

[0023] The straightening device includes a straightening frame 801, straightening rolls 802, straightening positioning angle seats 803, a straightening transmission shaft 804, straightening positioning lead screws 805, and straightening positioning blocks 806. The straightening rolls 802 are installed on the straightening transmission shaft 804, the straightening transmission shaft 804 is installed on the straightening positioning angle seats 803 through bearings, round nuts, and round nut stop washers, the straightening positioning angle seats 803 are installed on the straightening frame 801, and the straightening positioning lead screws 805 pass through the straightening positioning blocks 806 and are connected to the straightening positioning angle seats 803.

[0024] The shearing device includes a shearing frame 901, a shearing oil cylinder 902, a cutter 903, and a tool holder 904. The shearing oil cylinder 902 and the tool holder 904 are installed on the shearing frame 901, and the cutter 903 is installed on the tool holder 904.

[0025] A design method for the roll profile of the reverse bending rolls of a cold bending forming equipment for shelf columns is as follows: Step S1, use 3D modeling software to construct the original cold rolling model of the roll and the shelf column assembly.

[0026] Input the web width B, plate thickness H and the target cross-sectional shape parameters, and establish the original cold rolling model of the shelf column in the 3D modeling software. The cold rolling model of the shelf column includes the shelf column and the reverse bending rolls. The reverse bending rolls are divided into two parts: the upper reverse bending roll and the lower reverse bending roll. The normal clearance between the upper reverse bending roll and the lower reverse bending roll is equal to the plate thickness H of the sheet. The upper surface of the web of the shelf column is tangent to the upper reverse bending roll, and the lower surface of the web of the shelf column is tangent to the lower reverse bending roll. The web of the shelf column is placed in the middle of the reverse bending rolls at the horizontal symmetric position. Import the original cold rolling model of the shelf column into the finite element simulation software in Step S2. Step S2, set the upper reverse bending roll and the lower reverse bending roll as discrete rigid bodies, set the shelf column as a deformable body and endow it with material properties, define the contact properties between the roll and the shelf column, and create the analysis step, boundary conditions and element mesh settings. Step S3, extract the normal coordinate data of the web of the shelf column after simulation, and draw the coordinate curve graph and the transverse plastic strain graph. Establish a plane coordinate system with the transverse cross-section of the shelf column after cold rolling as the reference: the x-axis is along the web width direction, and the y-axis is along the vertical edge height direction. Divide the transverse length L of the web into 2n + 1 nodes, extract the normal coordinate data of each node, and establish the transverse coordinates of the web. The normal coordinate The set of web node coordinates can be expressed as Based on the normal coordinate data of each node, generate the web normal coordinate curve graph and the transverse plastic strain distribution graph. Step S4, calculate the integral value V of the transverse plastic strain graph, and judge whether the integral value V is within a reasonable range. Calculate the integral value V of the transverse plastic strain curve in the interval from 0 to L. Determine the defect type according to the sign of the V value: V>0 indicates that the web is convex as a whole, V<0 indicates that the web is concave as a whole. Set the qualified threshold q. If V satisfies 0<|V|<q, then enter Step S5; otherwise, jump to Step S6 for optimization. q is the integral value standard required during actual processing. Step S5, calculate the extreme value difference U of the coordinate curve graph, and judge whether the extreme value difference U is within a reasonable range. Divide the web normal coordinate curve into n intervals, calculate the extreme value difference U of the coordinate values in each interval, and judge the extreme value difference U. Set the qualified threshold p. If U<p, then output the final roll profile graph; otherwise, jump to Step S6 for optimization. p is the extreme value difference standard required during actual processing.

[0027] Step S6, optimize the shape parameters of the roll. Establish the coordinate system of the bending roll cross-section: Take the direction of the center line of the following bending roll as the x'-axis, and the direction on one side of the lower bending roll and perpendicular to the center line of the lower bending roll as the y'-axis. According to the roll surface contour, establish the upper roll surface function G(x') and the lower roll surface function H(x'). Calculate the curvature ka of the upper bending roll and the curvature kb of the lower bending roll through the upper bending roll surface shape function G(x`) and the lower bending roll surface shape function H(x`), and then obtain the radius of curvature Ra = 1 / ka, Rb = 1 / kb, where ; ; Then calculate the radii of curvature (Ra, Rb) of the upper and lower bending rolls according to the curvatures (ka, kb) of the upper and lower bending rolls; ; ; Adjust and improve the radii of curvature (Ra, Rb) of the upper and lower bending rolls; If input from step S4 to step S6, then make the following adjustments to the rolling mill: Let the radii of curvature of the upper and lower bending rolls after adjustment be ( 、 ), where: ; ; If input from step S5 to step S6, then make the following adjustments to the rolling mill: Let the radii of curvature of the upper and lower bending rolls after adjustment be ( 、 ), where: ; ; Step S7: Return the optimized radius of curvature value to step S1 to update the model; Re-execute the simulation and evaluation process from step S2 to step S5, and iterate until both the overall defect standard 0 < |V| < q and the local flatness standard U < p are satisfied, and finally output the bending roll profile drawing that meets the quality requirements.

[0028] Embodiment 2 Such as Figures 1-12As shown, taking the shelf column made of Q235 material as an example for illustration, it specifically includes a frame 1, an uncoiling device 2, a feeding device 3, a guiding device 4, a forming device 5, a reduction motor 6, a reverse bending device 7, a calibration device 8, and a shearing device 9; the uncoiling device 2 is located at the front end of the frame 1; the feeding device 3, the guiding device 4, the forming device 5, the reduction motor 6, the reverse bending device 7, the calibration device 8, and the shearing device 9 are all installed on the frame 1; the guiding device 4 is connected to the feeding device 3, and the guiding device 4 is located at the rear side of the feeding device 3; the forming device 5 is located at the rear side of the guiding device 4; the reduction motor 6 is arranged in the middle of the frame 1; the reverse bending device 7 is located at the rear side of the forming device 5, and the reverse bending device 7 is connected to the forming device 5; the calibration device 8 is arranged at the rear side of the reverse bending device 7; the shearing device 9 is located at the rear side of the calibration device 8.

[0029] The feeding device 3 includes a feeding roller 301 and a feeding panel 302, and the feeding roller 301 is installed on the inner side of the feeding panel 302 through bearings and bolts.

[0030] The guiding device 4 includes a guiding roller 401, a guiding frame 402, and a floating guiding mechanism 403, and the guiding roller 401 is connected to the guiding frame 402 through bearings and bolts.

[0031] The forming device includes forming rollers 501, forming wallboards 502, a forming tile box 503, a transmission shaft 504, positioning angle seats 505, positioning blocks 506, and positioning lead screws 507. The forming wallboards 502 are symmetrically installed on both sides of the frame 1, the forming tile box 503 is installed on the forming wallboards 502, the forming rollers 501 are installed on the transmission shaft 504, the transmission shaft 504 is installed on the forming tile box 503 through bearings, round nuts, and round nut stop washers, the positioning blocks 506 are installed on the symmetrically arranged forming wallboards 502 on both sides, the positioning lead screws 507 pass through the positioning blocks 506 and are connected to the forming tile box 503, the positioning angle seats 505 are provided with forming rollers 501, and the positioning angle seats 505 are connected to the forming wallboards 502.

[0032] The calibration device includes a calibration frame 801, calibration rollers 802, calibration positioning angle seats 803, a calibration transmission shaft 804, calibration positioning lead screws 805, and calibration positioning blocks 806. The calibration rollers 802 are installed on the calibration transmission shaft 804, the calibration transmission shaft 804 is installed on the calibration positioning angle seats 803 through bearings, round nuts, and round nut stop washers, the calibration positioning angle seats 803 are installed on the calibration frame 801, and the calibration positioning lead screws 805 pass through the calibration positioning blocks 806 and are connected to the calibration positioning angle seats 803.

[0033] The shearing device includes a shearing frame 901, a shearing oil cylinder 902, a cutting knife 903, and a tool holder 904. The shearing oil cylinder 902 and the tool holder 904 are installed on the shearing frame 901, and the cutting knife 903 is installed on the tool holder 904.

[0034] The design method of the bending roll profile includes the following steps: According to the production requirements, the width of the web of the shelf column before rolling is B = 160 mm, and the thickness is H = 2 mm. Create a cold rolling model of the shelf column as shown in Figure 8 the three-dimensional modeling software. The cold rolling model of the shelf column includes the shelf column and the bending rolls. The bending rolls are divided into the upper bending roll and the lower bending roll. The upper bending roll is above the web of the shelf column, and the lower bending roll is below the web of the shelf column. The normal clearance N between the upper and lower bending rolls is 2 mm. The upper and lower surfaces of the web of the shelf column are tangent to the surfaces of the upper and lower bending rolls respectively. The web of the shelf column is placed symmetrically in the middle of the bending rolls transversely. Import the original cold rolling model of the shelf column into the finite element simulation software.

[0035] In the finite element simulation software, simplify the models of the upper and lower bending rolls, and set the upper and lower bending rolls as discrete rigid bodies, and the shelf column as a deformable body. Create the material properties of Q235 in the material settings and assign them to the shelf column. Create an analysis step. In the interaction, the tangential friction coefficient between the bending roll and the shelf column is 0.2, and the normal is "hard" contact. In the load settings, set the speed of the shelf column as , the radius of the upper bending roll is , the radius of the lower bending roll is , the linear velocity is , the angular velocity of the upper bending roll is , and the angular velocity of the lower bending roll is The angular velocity directions of the upper and lower bending rolls are opposite. Mesh the shelf column and the bending rolls, and use the finite element simulation software to simulate the cold rolling model of the shelf column set above.

[0036] Taking the transverse section of the web of the shelf column after cold rolling as the reference plane, establish a plane rectangular coordinate system Oxy. Taking the web direction in the transverse section as the x-axis and the vertical edge direction as the y-axis, divide the web of the shelf column into 2n + 1 equal parts, extract the normal coordinate data of each node, and establish the transverse coordinate of the web , the normal coordinate , and the web node coordinate set can be expressed as . Based on the web node coordinate set, draw the web section coordinate curve graph and the transverse plastic strain graph.

[0037] Integrate the transverse plastic strain graph of the web at this time to obtain the integral value at this time. At this time, the overall web is convex. The integral value required for actual processing and production. At this time, the integral value V > q. Therefore, correct the bending roll.

[0038] A rectangular coordinate system Ox`y` is established with the cross-section of the reverse bending roll as the plane. The direction of the center line of the lower reverse bending roll is taken as the x`-axis, and the direction on one side of the lower reverse bending roll and perpendicular to the center line of the lower reverse bending roll is taken as the y`-axis. According to the shapes of the upper and lower reverse bending rolls, the surface shape function G(x`) of the upper reverse bending roll and the surface shape function H(x`) of the lower reverse bending roll are extracted and established, and the curvature ka of the upper reverse bending roll and the curvature kb of the lower reverse bending roll are calculated through the surface shape function G(x`) of the upper reverse bending roll and the surface shape function H(x`), where 、 . Then, according to the curvatures (ka, kb) of the upper and lower reverse bending rolls, the curvature radii (Ra, Rb) of the upper and lower reverse bending rolls are calculated, where 、 , and the following corrections are made to the reverse bending rolls: the curvature radius of the upper reverse bending roll , the curvature radius of the lower reverse bending roll .

[0039] The adjusted reverse bending rolls are re-modeled and simulated, the normal coordinates of the web are extracted, and a coordinate curve graph and a transverse plastic strain graph are constructed.

[0040] And the transverse plastic strain graph is integrated, and the integral value V = 0.0052 is calculated at this time. The web is generally convex, and at this time the integral value V < q. Then the coordinate curve graph is equally divided into n parts to create n intervals, and the extreme value difference U = 0.1034 mm is calculated within the n intervals. The required extreme value difference for actual production is p = 0.3 mm. At this time, U < p, which meets the production requirements, and the roll shape graph of the reverse bending roll at this time is obtained.

[0041] Therefore, the present invention adopts the above-mentioned cold bending forming equipment for shelf columns and the reverse bending roll profile design method. The equipment has a simple structure and low cost. The method breaks through the traditional trial-and-error mode, realizes the precise optimization of roll parameters through functional modeling, significantly reduces the debugging cost, improves the flatness of the shelf column web, and has important engineering application value.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A cold bending forming device for a shelf column, characterized in that, It includes a frame, an uncoiler, a feeding device, a guiding device, a forming device, a reduction motor, a reverse bending device, a straightening device and a shearing device; the uncoiler is located at the front end of the frame; the feeding device, the guiding device, the forming device, the reduction motor, the reverse bending device, the straightening device and the shearing device are all installed on the frame; the guiding device is connected to the feeding device and is located at the rear side of the feeding device; the forming device is located at the rear side of the guiding device; the reduction motor is arranged in the middle of the frame; the reverse bending device is located at the rear side of the forming device and is connected to the forming device; the straightening device is arranged at the rear side of the reverse bending device; the shearing device is located at the rear side of the straightening device.

2. The cold bending forming equipment for a shelf column according to claim 1, characterized in that, The feeding device includes a feeding roller and a feeding panel, and the feeding roller is installed inside the feeding panel through bearings and bolts.

3. A cold bending forming device for a shelf column according to claim 1, characterized in that, The guiding device includes guiding rollers, a guiding frame and a floating guiding mechanism, and the guiding rollers are connected to the guiding frame through bearings and bolts.

4. A cold bending forming device for a shelf column according to claim 1, characterized in that The forming device includes forming rollers, forming wallboards, forming tile boxes, transmission shafts, positioning angle seats, positioning blocks and positioning lead screws. The forming wallboards are symmetrically installed on both sides of the frame, the forming tile boxes are installed on the forming wallboards, the forming rollers are installed on the transmission shafts, the transmission shafts are installed on the forming tile boxes through bearings, round nuts and round nut stop washers, the positioning blocks are installed on the symmetrically arranged forming wallboards on both sides, the positioning lead screws pass through the positioning blocks and are connected to the forming tile boxes, the positioning angle seats are provided with forming rollers, and the positioning angle seats are connected to the forming wallboards.

5. The cold bending forming equipment for a shelf column according to claim 1, characterized in that, The straightening device includes a straightening frame, straightening rollers, straightening positioning angle seats, straightening transmission shafts, straightening positioning lead screws and straightening positioning blocks. The straightening rollers are installed on the straightening transmission shafts, the straightening transmission shafts are installed on the straightening positioning angle seats through bearings, round nuts and round nut stop washers, the straightening positioning angle seats are installed on the straightening frame, and the straightening positioning lead screws pass through the straightening positioning blocks and are connected to the straightening positioning angle seats.

6. The cold bending forming equipment for a shelf column according to claim 1, characterized in that, The shearing device includes a shearing frame, a shearing oil cylinder, a cutter and a tool holder. The shearing oil cylinder and the tool holder are installed on the shearing frame, and the cutter is installed on the tool holder.

7. A design method for the roll profile of the reverse bending roll of a cold bending forming device for a shelf column according to any one of claims 1-6, characterized in that, It includes the following steps: Step S1: Use 3D modeling software to construct the original cold rolling model of the shelf column of the roll and the shelf column assembly; Input the web width B, plate thickness H and target cross-sectional shape parameters, and establish the original cold rolling model of the shelf column in the 3D modeling software. The cold rolling model of the shelf column includes a shelf column and reverse bending rollers. The reverse bending rollers are divided into an upper reverse bending roller and a lower reverse bending roller. The normal clearance between the upper reverse bending roller and the lower reverse bending roller is equal to the plate thickness H of the sheet; the upper surface of the web of the shelf column is tangent to the upper reverse bending roller, and the lower surface of the web of the shelf column is tangent to the lower reverse bending roller; the web of the shelf column is placed in the middle of the reverse bending rollers at the horizontal symmetric position; import the original cold rolling model of the shelf column into the finite element simulation software in step S2; Step S2: Set the upper reverse bending roller and the lower reverse bending roller as discrete rigid bodies, set the shelf column as a deformable body and endow it with material properties, define the contact properties between the roll and the shelf column, and create analysis steps, boundary conditions and unit meshing settings; Step S3: Extract the normal coordinate data of the web of the shelf column after simulation, and draw a coordinate curve graph and a transverse plastic strain graph; Establish a plane coordinate system with the transverse cross-section of the shelf column after cold rolling forming as the reference: the x-axis is along the width direction of the web, and the y-axis is along the height direction of the vertical edge. Divide the transverse length L of the web equally into 2n + 1 nodes, extract the normal coordinate data of each node, and generate a web normal coordinate curve graph and a transverse plastic strain distribution graph based on the normal coordinate data of each node; Step S4: Calculate the integral value V of the transverse plastic strain graph and judge whether the integral value V is within a reasonable range; Calculate the integral value V of the transverse plastic strain curve in the interval from 0 to L, and determine the defect type according to the sign of the V value: V > 0 indicates that the web is convex as a whole, V < 0 indicates that the web is concave as a whole. Set a qualified threshold q. If V satisfies 0 < |V| < q, then go to step S5; otherwise, jump to step S6 for optimization. q is the integral value standard required during actual processing; Step S5: Calculate the extreme value difference U of the coordinate curve graph and judge whether the extreme value difference U is within a reasonable range; Divide the web normal coordinate curve into n intervals, calculate the extreme value difference U of the coordinate values in each interval, and judge the extreme value difference U. Set a qualified threshold p. If U < p, then output the final roll profile graph; otherwise, jump to step S6 for optimization. p is the extreme value difference standard required during actual processing; Step S6: Optimize the shape parameters of the roll; Establish a reverse bending roll cross-section coordinate system: take the direction of the center line of the lower reverse bending roll as the x'-axis, and the direction perpendicular to the center line of the lower reverse bending roll on one side of the lower reverse bending roll as the y'-axis. Establish the upper roll surface function G(x') and the lower roll surface function H(x') according to the roll surface profile. Calculate the curvature ka of the upper reverse bending roll and the curvature kb of the lower reverse bending roll through the upper reverse bending roll surface shape function G(x`) and the lower reverse bending roll surface shape function H(x`), and then obtain the curvature radii Ra = 1 / ka and Rb = 1 / kb, where ； ； Then calculate the curvature radii (Ra, Rb) of the upper and lower reverse bending rolls according to the curvatures (ka, kb) of the upper and lower reverse bending rolls; ； ； Adjust and improve the curvature radii (Ra, Rb) of the upper and lower reverse bending rolls; If it is input from step S4 to step S6, the following adjustments are made to the roll: Let the radius of curvature of the upper and lower bending rolls after adjustment be ( , ), where: ； ； If it is input from step S5 to step S6, the following adjustments are made to the rolls: Let the radius of curvature of the upper and lower bending rolls after adjustment be ( , ), where: ； ； Step S7: Return the optimized curvature radius value to step S1 to update the model; re-execute the simulation and evaluation process from step S2 to step S5, and iterate until both the overall defect standard 0 < |V| < q and the local flatness standard U < p are satisfied, and finally output the reverse bending roll profile drawing that meets the quality requirements.

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