A cold-bending forming equipment for shelf columns and a design method for reverse bending roller profiles

Abstract

The present invention discloses a cold-bending forming device for shelf columns and a method for designing the roll profile of a reverse bending roller, which relates to the field of cold-bending forming and includes a frame, an unwinding device, a feeding device, a guiding device, a forming device, a reduction motor, a reverse bending device, a correction device, and a shearing device; the unwinding 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 correction device, and the shearing device are all installed on the frame; the guiding device is connected to the feeding device, and the guiding device is located at the rear side of the feeding device; the forming device is located at the rear side of the guiding device; and the reduction motor is arranged in the middle of the frame. The present invention adopts the above-mentioned cold-bending forming device for shelf columns and a method for designing the roll profile of a reverse bending roller. The equipment has a simple structure and low cost. The method breaks through the traditional trial-and-error mode and realizes precise optimization of roller parameters through functional modeling, significantly reduces debugging costs, and improves the flatness of the web of the shelf columns, which has important engineering application value.

Description

Technical Field

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

[0002] Shelf columns are structural plates with unique cross-sectional profiles, which can take on complex cross-sectional forms such as Z- and U-shapes. Due to the complex cross-sectional profiles of shelf columns, it is essential to design equipment specifically for processing them. Furthermore, during the cold rolling process, the web of shelf columns is prone to crowning defects, which are localized convex or concave deformations along the thickness of the plate.

[0003] In order to solve this defect, reverse bending passes are added during the cold rolling process during design and actual processing. However, the design of the cross-sectional bending degree of the upper and lower reverse bending rollers in the reverse bending passes 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 equipment for shelf columns and a reverse-bending roller design method. The equipment has a simple structure and low cost. The method breaks through the traditional trial-and-error mode and realizes precise optimization of roller parameters through functional modeling, which significantly reduces the debugging cost and improves the flatness of the shelf column web, and has important engineering application value.

[0005] The present invention provides a cold-bending forming device for a shelf column and a method for designing a reverse-bending roller profile, comprising a frame, an unwinding device, a feeding device, a guiding device, a forming device, a reduction motor, a reverse-bending device, a correction device and a shearing device; the unwinding 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 correction device and the shearing device are all installed on the frame; the guiding device is connected to the feeding device, and the guiding device 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 the reverse-bending device is connected to the forming device; the correction device is arranged at the rear side of the reverse-bending device; and the shearing device is located at the rear side of the correction device.

[0006] Preferably, the feeding device includes a feeding roller and a feeding panel, and the feeding roller is installed on the inner side of the feeding panel through bearings and bolts.

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

[0008] Preferably, the forming device includes forming rollers, forming wall panels, forming tile boxes, transmission shafts, positioning angle seats, positioning blocks and positioning screws. The forming wall panels are symmetrically installed on the frame on both sides, the forming tile boxes are installed on the forming wall panels, 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 forming wall panels symmetrically on both sides, the positioning screws pass through the positioning blocks and are connected to the forming tile boxes, the positioning angle seats are installed with forming rollers, and the positioning angle seats are connected to the forming wall panels.

[0009] Preferably, the correction device includes a correction frame, a correction roller, a correction positioning angle seat, a correction transmission shaft, a correction positioning screw, and a correction positioning block. The correction roller is installed on the correction transmission shaft, the correction transmission shaft is installed on the correction positioning angle seat through bearings, round nuts and round nut stop washers, the correction positioning angle seat is installed on the correction frame, and the correction positioning screw passes through the correction positioning block and is connected to the correction positioning angle seat.

[0010] Preferably, the shearing device comprises a shearing frame, a shearing cylinder, a cutter and a cutter holder, the shearing cylinder and the cutter holder are mounted on the shearing frame, and the cutter is mounted on the cutter holder.

[0011] Preferably, the method comprises the following steps:

[0012] Step S1, using 3D modeling software to construct an original shelf column cold rolling model of the roller and shelf column assembly;

[0013] Input the web width B, plate thickness H, and target cross-sectional shape parameters, and establish an original shelf column cold rolling model in the 3D modeling software. The shelf column cold rolling model includes the shelf column and the rebending roller. The rebending roller is divided into an upper rebending roller and a lower rebending roller. The normal gap between the upper and lower rebending rollers is equal to the plate thickness H. The upper surface of the shelf column web is tangent to the upper rebending roller, and the lower surface of the shelf column web is tangent to the lower rebending roller. The shelf column web is placed in the middle of the rebending roller in a transversely symmetrical position. The original shelf column cold rolling model is imported into the finite element simulation software of step S2.

[0014] Step S2: Set the upper and lower rebending rollers as discrete rigid bodies, the shelf columns as deformable bodies and assign material properties, define the contact properties between the rollers and the shelf columns, and create analysis steps, boundary conditions, and unit mesh settings;

[0015] Step S3, extracting the normal coordinate data of the rack column web after simulation, and drawing a coordinate curve graph and a transverse plastic strain graph;

[0016] 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, the y-axis is along the height direction of the vertical edge, equally 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;

[0017] 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;

[0018] 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 bulges as a whole, V<0 indicates that the web sinks as a whole, set a qualified threshold q, if V satisfies 0<|V|<q, then enter step S5; otherwise, jump to step S6 for optimization, and q is the integral value standard required during actual processing;

[0019] 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;

[0020] Equally divide the web normal coordinate curve 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 shape graph; otherwise, jump to step S6 for optimization, and p is the extreme value difference standard required during actual processing;

[0021] Step S6: Optimize the shape parameters of the rolling mill;

[0022] 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 on one side of the lower reverse bending roll and perpendicular to the center line 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, Rb = 1 / kb, where

[0023] ;

[0024] ;

[0025] 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;

[0026] ; ;

[0027] Adjust and improve the curvature radii (Ra, Rb) of the upper and lower bending rolls; if input from step S4 to step S6, adjust the rolls as follows: Let the curvature radii of the upper and lower bending rolls after adjustment be ( , ), where:

[0028] ;

[0029] ;

[0030] If input from step S5 to step S6, adjust the rolls as follows: Let the curvature radii of the upper and lower bending rolls after adjustment be ( , ), where:

[0031] ;

[0032] ;

[0033] 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 bending roll profile drawing meeting the quality requirements.

[0034] Therefore, the present invention adopts the above - mentioned cold - roll forming equipment for shelf columns and the design method of the bending roll profile. The equipment 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, and improves the flatness of the shelf column web, having important engineering application value.

[0035] 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

[0036] Figure 1 It is a schematic diagram of the equipment in the embodiment of the cold - roll forming equipment for shelf columns and the design method of the bending roll profile of the present invention; <000;

[0037] Figure 2 It is a schematic diagram of the feeding device in the embodiment of the cold - roll forming equipment for shelf columns and the design method of the bending roll profile of the present invention;

[0038] Figure 3 It is a schematic diagram of the guiding device in the embodiment of the cold - roll forming equipment for shelf columns and the design method of the bending roll profile of the present invention;

[0039] Figure 4It is a partial schematic diagram of a forming device according to an embodiment of a cold-bending forming device for a shelf column and a method for designing a reverse bending roller profile according to the present invention;

[0040] Figure 5 A schematic diagram of a correction device according to an embodiment of a cold-bending forming device for a shelf column and a method for designing a reverse bending roller profile according to the present invention;

[0041] Figure 6 A schematic diagram of a shearing device according to an embodiment of a cold-bending forming device for a shelf column and a method for designing a reverse bending roller profile according to the present invention;

[0042] Figure 7 This is a flow chart of an embodiment of a cold-bending forming device for a shelf column and a method for designing a reverse bending roller profile according to the present invention;

[0043] Figure 8 A schematic diagram of an initial three-dimensional model of a shelf column and a reverse bending roller according to an embodiment of a cold-bending forming device for a shelf column and a method for designing a reverse bending roller profile;

[0044] Figure 9 A schematic diagram of a rectangular coordinate system of a web cross-section plane after cold rolling simulation in a specific embodiment of a cold-bending forming device for a shelf column and a method for designing a reverse bending roller profile of the present invention;

[0045] Figure 10 A web normal coordinate curve diagram of an embodiment of a shelf column cold roll forming device and a reverse bending roller profile design method of the present invention;

[0046] Figure 11 A transverse plastic strain diagram of a web of an embodiment of a cold-bending forming device for a shelf column and a method for designing a reverse bending roller profile according to the present invention;

[0047] Figure 12 It is a schematic diagram of a rectangular coordinate system during the optimization process of upper and lower reverse bending rollers in an embodiment of a cold-bending forming device for a shelf column and a reverse bending roller profile design method of the present invention.

[0048] Reference numerals

[0049] 1. Frame; 2. Unwinding device; 3. Feeding device; 4. Guide device; 5. Forming device; 6. Reducer motor; 7. Rebending device; 8. Correction device; 9. Shearing device; 301. Feeding roller; 302. Feeding panel; 401. Guide roller; 402. Guide frame; 403. Floating guide mechanism; 501. Forming roller; 502. Forming wall panel; 503. Forming tile box; 504. Drive shaft; 505. Positioning angle seat; 506. Positioning block; 507. Positioning screw; 801. Correction frame; 802. Correction roller; 803. Correction positioning angle seat; 804. Correction drive shaft; 805. Correction positioning screw; 806. Correction positioning block; 901. Shearing frame; 902. Shearing cylinder; 903. Cutter; 904. Knife holder. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0051] Unless otherwise defined, technical or scientific terms used in the present invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0052] The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0053] Example 1

[0054] like Figures 1-12As shown, the present invention provides a cold-bending forming equipment for shelf columns and a method for designing a reverse-bending roller profile, comprising a frame 1, an unwinding device 2, a feeding device 3, a guiding device 4, a forming device 5, a reduction motor 6, a reverse-bending device 7, a correction device 8 and a shearing device 9; the unwinding device 2 is located at the front end 1 of the frame; the feeding device 3, the guiding device 4, the forming device 5, the reduction motor 6, the reverse-bending device 7, the correction 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 correction device 8 is arranged at the rear side of the reverse-bending device 7; and the shearing device 9 is located at the rear side of the correction device 8.

[0055] The feeding device 3 includes a feeding roller 301 and a feeding panel 302 . The feeding roller 301 is mounted on the inner side of the feeding panel 302 via bearings and bolts.

[0056] The guide device 4 includes a guide roller 401 , a guide frame 402 and a floating guide mechanism 403 . The guide roller 401 is connected to the guide frame 402 via bearings and bolts.

[0057] The forming device includes a forming roller 501, a forming wall panel 502, a forming tile box 503, a transmission shaft 504, a positioning angle seat 505, a positioning block 506 and a positioning screw 507. The forming wall panel 502 is symmetrically installed on the frame 1 on both sides, the forming tile box 503 is installed on the forming wall panel 502, the forming roller 501 is 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 block 506 is installed on the forming wall panel 502 symmetrically on both sides, the positioning screw 507 passes through the positioning block 506 and is connected to the forming tile box 503, the positioning angle seat 505 is installed with the forming roller 501, and the positioning angle seat 505 is connected to the forming wall panel 502.

[0058] The correction device includes a correction frame 801, a correction roller 802, a correction positioning angle seat 803, a correction transmission shaft 804, a correction positioning screw 805, and a correction positioning block 806. The correction roller 802 is installed on the correction transmission shaft 804. The correction transmission shaft 804 is installed on the correction positioning angle seat 803 through bearings, round nuts and round nut locking washers. The correction positioning angle seat 803 is installed on the correction frame 801. The correction positioning screw 805 passes through the correction positioning block 806 and is connected to the correction positioning angle seat 803.

[0059] The shearing device includes a shearing frame 901 , a shearing cylinder 902 , a cutter 903 and a cutter holder 904 . The shearing cylinder 902 and the cutter holder 904 are installed on the shearing frame 901 , and the cutter 903 is installed on the cutter holder 904 .

[0060] A method for designing the roll profile of the reverse bending roll of a cold bending forming equipment for shelf columns is as follows: Step S1, use three-dimensional modeling software to construct the original cold rolling model of the roll and the shelf column assembly.

[0061] Input the web width B, plate thickness H and target cross-section shape parameters, and establish the original cold rolling model of the shelf column in the three-dimensional modeling software. The cold rolling model of the shelf column includes the shelf column and the reverse bending roll. The reverse bending roll is 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 roll at the horizontal symmetric position. Import the original cold rolling model of the shelf column into the finite element simulation software in Step S2;

[0062] 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 analysis steps, boundary conditions and unit meshing settings;

[0063] 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;

[0064] 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 equally, extract the normal coordinate data of each node, and establish the transverse coordinates of the web of the web, the normal coordinate The web node coordinate set 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;

[0065] 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;

[0066] Calculate the integral value V of the transverse plastic strain curve in the interval from 0 to L, and judge the defect type according to the sign of the V value: V>0 indicates that the web bulges as a whole, V<0 indicates that the web sinks 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;

[0067] 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;

[0068] Divide the web normal coordinate curve into n intervals equally, calculate the extreme difference U of the coordinate values in each interval, and judge the extreme difference U. Set the qualified threshold p. If U < p, output the final roll profile; otherwise, jump to step S6 for optimization. p is the standard of the extreme difference required during actual processing.

[0069] Step S6: Optimize the shape parameters of the roll;

[0070] Establish the reverse bending roll cross-section coordinate system: Take the following reverse bending roll center line direction as the x'-axis, and the direction on one side of the lower reverse bending roll and perpendicular to the lower reverse bending roll center line 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

[0071] ;

[0072] ;

[0073] 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;

[0074] ; ;

[0075] Adjust and improve the curvature radii (Ra, Rb) of the upper and lower reverse bending rolls; If input from step S4 to step S6, adjust the roll as follows: Let the curvature radii of the upper and lower reverse bending rolls after adjustment be ( , ), where:

[0076] ;

[0077] ;

[0078] If input from step S5 to step S6, adjust the roll as follows: Let the curvature radii of the upper and lower reverse bending rolls after adjustment be ( , ), where:

[0079] ;

[0080] ;

[0081] 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 cyclically until both the overall defect criterion 0 < |V| < q and the local flatness criterion U < p are satisfied, and finally output the roll profile drawing of the bending roll that meets the quality requirements.

[0082] Embodiment 2

[0083] As Figures 1-12 shown, taking the shelf column made of Q235 material as an example for illustration, it specifically includes a frame 1, an uncoiler 2, a feeding device 3, a guiding device 4, a forming device 5, a reduction motor 6, a bending device 7, a correction device 8 and a shearing device 9; the uncoiler 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 bending device 7, the correction 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 bending device 7 is located behind the forming device 5, and the bending device 7 is connected to the forming device 5; the correction device 8 is arranged behind the bending device 7; the shearing device 9 is located behind the correction device 8.

[0084] 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.

[0085] 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.

[0086] The forming device includes forming rolls 501, forming wallboards 502, a forming box 503, a transmission shaft 504, positioning angle seats 505, positioning blocks 506 and positioning screw rods 507. The forming wallboards 502 are symmetrically installed on both sides of the frame 1, the forming 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 box 503 through bearings, round nuts and round nut locking washers, the positioning blocks 506 are installed on the symmetrically arranged forming wallboards 502 on both sides, the positioning screw rods 507 pass through the positioning blocks 506 and are connected to the forming box 503, and the positioning angle seats 505 are provided with forming rolls 501 and are connected to the forming wallboards 502.

[0087] The correction device includes a correction frame 801, a correction roller 802, a correction positioning angle seat 803, a correction transmission shaft 804, a correction positioning screw 805, and a correction positioning block 806. The correction roller 802 is installed on the correction transmission shaft 804. The correction transmission shaft 804 is installed on the correction positioning angle seat 803 through bearings, round nuts and round nut locking washers. The correction positioning angle seat 803 is installed on the correction frame 801. The correction positioning screw 805 passes through the correction positioning block 806 and is connected to the correction positioning angle seat 803.

[0088] The shearing device includes a shearing frame 901 , a shearing cylinder 902 , a cutter 903 and a cutter holder 904 . The shearing cylinder 902 and the cutter holder 904 are installed on the shearing frame 901 , and the cutter 903 is installed on the cutter holder 904 .

[0089] The design method of the reverse bending roll profile includes the following steps: according to the production requirements, the width of the web of the pre-rolling shelf column is B = 160 mm and the thickness of the plate is H = 2 mm. Figure 8 The shelf column cold rolling model shown in the figure includes shelf columns and rebending rollers. The rebending rollers are divided into upper and lower rebending rollers. The upper rebending roller is above the shelf column web, and the lower rebending roller is below the shelf column web. The normal gap between the upper and lower rebending rollers is N=2mm. The upper and lower surfaces of the shelf column web are tangent to the surfaces of the upper and lower rebending rollers respectively. The shelf column web is placed in the middle of the rebending rollers in a transversely symmetrical position. The original shelf column cold rolling model is imported into the finite element simulation software.

[0090] In the finite element simulation software, the models of the upper and lower rebending rollers are simplified, and the upper and lower rebending rollers are set as discrete rigid bodies, and the shelf columns are set as deformable bodies. In the material settings, the material properties of Q235 are created and assigned to the shelf columns, and an analysis step is created. In the interaction, the tangential friction coefficient between the rebending roller and the shelf column is 0.2, and the normal contact is "hard"; in the load settings, the speed of the shelf column is set to , the radius of the upper reverse bending roller is , the radius of the lower reverse bending roller is , the linear velocity is , the angular velocity of the upper reverse bending roller is , the angular velocity of the lower reverse bending roller is The angular velocity directions of the upper and lower reverse bending rollers are opposite; the shelf columns and reverse bending rollers are meshed, and the cold rolling model of the shelf columns set up above is simulated using finite element simulation software.

[0091] The transverse section of the cold-rolled shelf column web is used as the reference plane to establish a plane rectangular coordinate system Oxy. The web direction in the transverse section is the x-axis and the vertical side direction is the y-axis. The shelf column web is divided into 2n+1 equal parts, and the normal coordinate data of each node is extracted to establish the transverse coordinate system of the web. , normal coordinates , 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.

[0092] Integrate the transverse plastic strain graph of the web at this time to obtain the integral value at this time , at this time the web is generally convex, and the integral value required for actual processing and production<{ , at this time the integral value V>q, so the bending rolls are corrected.

[0093] Establish a rectangular coordinate system Ox`y` with the cross-section of the bending rolls as the plane. Take the direction of the center line of the lower bending rolls as the x` axis, and the direction on one side of the lower bending rolls and perpendicular to the center line of the lower bending rolls as the y` axis. Extract and establish the surface shape function G(x`) of the upper bending rolls and the surface shape function H(x`) of the lower bending rolls according to the shapes of the upper and lower bending rolls, and calculate the curvature ka of the upper bending rolls and the curvature kb of the lower bending rolls through the surface shape function G(x`) of the upper bending rolls and the surface shape function H(x`) of the lower bending rolls, where 、 , and then calculate the radius of curvature (Ra, Rb) of the upper and lower bending rolls according to the curvatures (ka, kb) of the upper and lower bending rolls, where 、 , and correct the bending rolls as follows: the radius of curvature of the upper bending rolls , the radius of curvature of the lower bending rolls .

[0094] Re-model and simulate the adjusted bending rolls, extract the normal coordinates of the web, and construct the coordinate curve graph and the transverse plastic strain graph. [[ID=?]] [[ID=?]]

[0095] Integrate the transverse plastic strain graph, calculate the integral value V = 0.0052 at this time, the web is generally convex, and at this time the integral value V<q. Then divide the coordinate curve graph into n equal parts, create n intervals, calculate the extreme value difference U = 0.1034mm within the n intervals, and the required extreme value difference for actual production is p = 0.3mm, at this time U<p, meeting the production requirements, and obtain the bending roll profile graph at this time.

[0096] Therefore, the present invention adopts the above-mentioned cold bending forming equipment for shelf columns and the design method of the bending roll profile. 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 web of the shelf columns, and has important engineering application value.

[0097] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for designing the reverse bending roller profile of a shelf column cold roll forming equipment, 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 the target cross-section 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 bending rolls. The bending rolls are divided into two parts: the upper bending roll and the lower bending roll. The normal clearance between the upper bending roll and the lower 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 bending roll, and the lower surface of the web of the shelf column is tangent to the lower bending roll. The web of the shelf column is placed in the middle of the bending rolls at the horizontal symmetry 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 bending roll and the lower 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 analysis steps, boundary conditions and unit 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 equally, 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 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 bulges as a whole, V<0 indicates that the web sinks 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 equally, calculate the extreme value difference U within each interval, and judge the extreme value difference U. Set the qualified threshold p. If U<p, then output the final roll shape 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 the cross-section coordinate system of the bending roll: Take the center line direction of the lower bending roll as the x'-axis, and the direction perpendicular to the center line of the lower bending roll on one side of the lower 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 contour. 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 curvature radius Ra = 1 / ka, Rb = 1 / kb, where ； ； Then calculate the curvature radii (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 curvature radii (Ra, Rb) of the upper and lower bending rolls; If the step S4 is input to the step S6, the rolls are adjusted as follows: the curvature radius (Ra) of the upper and lower reverse bending rolls after adjustment is set to i , Rb i ),in: ； ； If the step S5 is input to the step S6, the rollers are adjusted as follows: the curvature radius (Ra) of the upper and lower reverse bending rollers after adjustment is set to i , Rb i ),in: ； ； 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, and finally output the roll profile drawing of the bending roll that meets the quality requirements.

2. A cold-bending forming equipment for shelf columns, characterized in that: It includes a frame, an uncoiler, a feeding device, a guiding device, a forming device, a reduction motor, a bending device, a correcting 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 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 bending device is located behind the forming device and is connected to the forming device; the correcting device is arranged behind the bending device; the shearing device is located behind the correcting device, and the bending device includes a bending roll, which is obtained by the roll profile design method shown in Claim 1.

3. The cold roll forming equipment for shelf columns according to claim 2, characterized in that: The feeding device includes a feeding idler and a feeding panel, and the feeding idler is installed inside the feeding panel through bearings and bolts.

4. The cold roll forming equipment for shelf columns according to claim 2, characterized in that: The guiding device includes guiding idlers, a guiding frame, and a floating guiding mechanism, and the guiding idlers are connected to the guiding frame through bearings and bolts.

5. The cold roll forming equipment for shelf columns according to claim 2, characterized in that: The forming device includes forming rolls, forming wallboards, a forming tile box, a transmission shaft, positioning angle seats, positioning blocks, and positioning screw rods. The forming wallboards are symmetrically installed on both sides of the frame, the forming tile box is installed on the forming wallboards, the forming rolls are 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 screw rods pass through the positioning blocks and are connected to the forming tile box, the positioning angle seats are equipped with forming rolls, and the positioning angle seats are connected to the forming wallboards.

6. The cold roll forming equipment for shelf columns according to claim 2, characterized in that: The correcting device includes a correcting frame, correcting rolls, correcting positioning angle seats, a correcting transmission shaft, correcting positioning screw rods, and correcting positioning blocks. The correcting rolls are installed on the correcting transmission shaft, the correcting transmission shaft is installed on the correcting positioning angle seats through bearings, round nuts, and round nut stop washers, the correcting positioning angle seats are installed on the correcting frame, and the correcting positioning screw rods pass through the correcting positioning blocks and are connected to the correcting positioning angle seats.

7. The cold roll forming equipment for shelf columns according to claim 2, characterized in that: The shearing device includes a shearing frame, a shearing oil cylinder, a cutting knife, and a tool holder. The shearing oil cylinder and the tool holder are installed on the shearing frame, and the cutting knife is installed on the tool holder.

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