Method for bending and twisting a steel sheet

Abstract

A method for bending and twisting a bending and twisting steel plate, the method comprising the following steps: S1, determining the twist degree of the end faces at both ends of the standard bending and twisting member length direction and the twist degree of several cross sections of the standard bending and twisting member; S2, arranging a pressing die according to the positions of the end faces at both ends of the standard bending and twisting member length direction and the positions of several cross sections of the standard bending and twisting member; S3, placing an initial steel plate corresponding to the pressing die, and starting from one end face of the initial steel plate length direction, pressing in turn according to the determined twist degree until completion. The method for bending and twisting the bending and twisting steel plate, by modeling the standard bending and twisting member, obtaining the bending degree of the standard bending and twisting member, and pressing the initial steel plate according to the obtained bending degree, the production efficiency is high, and the machining precision is higher than that of the traditional hot bending forming.

Description

Technical Field

[0001] This invention relates to the field of steel structure processing technology, and in particular to a method for bending and twisting steel plates. Background Technology

[0002] In modern steel structure design, box-shaped twisted steel components are frequently used. During the manufacturing process of twisted steel components, the bending and twisting of the steel plates that make up the components is a key step. The efficiency of the bending and twisting process is the foundation for ensuring the success of subsequent processes. Traditional steel plate forming methods are basically flame hot bending or multi-pass spinning. Both hot bending and multi-pass spinning have the problem of low production efficiency, and hot bending is prone to material shrinkage, which affects the processing accuracy of box-shaped twisted steel components. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a bending and twisting forming method for steel plates, which has high production efficiency and higher processing precision compared with traditional hot bending forming.

[0004] This invention provides a method for bending and twisting steel plates, comprising the following steps:

[0005] S1, determine the torsion of the end faces at both ends of the standard bending and torsion member along its length and the torsion of several cross sections of the standard bending and torsion member.

[0006] S2, The pressing mold is arranged according to the position of the end faces of the two ends of the standard bending and twisting component along the length direction and the position of the cross section of the standard bending and twisting component.

[0007] S3, Place the initial steel plate on the pressing mold, and press it sequentially according to the determined twist degree, starting from one end face along the length of the initial steel plate, until completion.

[0008] In one embodiment, step S1, determining the torsion of the end faces at both ends of the standard bending and torsion member along its length and the torsion of several cross sections of the standard bending and torsion member, further includes:

[0009] S101, Modeling standard bending and torsion members;

[0010] S102, Establish a coordinate system based on the established standard bending and torsion member model;

[0011] S103, mark several marker points on the standard bending and torsion member model to determine the first coordinate position of the cross section of the standard bending and torsion member at the end faces at both ends in the length direction of the standard bending and torsion member and at the positions of several marker points.

[0012] S104, determine the torsion of the end face and the cross section corresponding to the marked point based on the coordinate position of the end face and the coordinate position of several cross sections.

[0013] In one embodiment, step S2, which involves arranging a pressing mold according to the positions of the end faces at both ends of the standard bending and twisting member along its length and the positions of the cross sections of the standard bending and twisting members, further includes:

[0014] S201, unfold the standard bending and twisting member model to obtain an unfolded twisted steel plate model;

[0015] S202, determine the second coordinate positions of the two end faces and several marked points along the length direction of the unfolded twisted steel plate model;

[0016] S203, The pressing mold is arranged according to the second coordinate position.

[0017] In one embodiment, step S203, which involves arranging the pressing mold according to the second coordinate position, further includes:

[0018] S203a, according to the second coordinate positions corresponding to both ends of the unfolded twisted steel plate model, the corresponding pressing mold is arranged;

[0019] S203b, determine the second coordinate position of the mark point on the unfolded twisted steel plate model, determine the preset layout point position according to the second coordinate position of the mark point, and lay out the corresponding pressing mold. A preset distance is reserved between the preset layout point position and the corresponding second coordinate position of the mark point.

[0020] In one embodiment, step S3, which involves placing the initial steel plate on the pressing mold and pressing it sequentially according to a determined degree of torsion starting from one end face along the length of the initial steel plate until completion, further includes:

[0021] S301, the end of the initial steel plate is placed on the corresponding pressing mold, and the position on the initial steel plate corresponding to the marked point on the unfolded twisted steel plate model is placed on the other pressing molds.

[0022] S302, Select one end face of the initial steel plate along its length and press it according to the torsion degree of the corresponding end face on the standard bending and twisting member;

[0023] S303, After pressing, select the position of the initial steel plate corresponding to the mark point adjacent to the end face of the initial steel plate, and calculate the difference between the torsion of the cross section of the initial steel plate corresponding to the adjacent mark point and the torsion of the selected end face.

[0024] S304, Press the position of the initial steel plate corresponding to the adjacent marked point according to the difference;

[0025] S305, repeat steps S303 and S304 above until the other end face of the initial steel plate is pressed in the length direction.

[0026] In one embodiment, the initial steel plate is pressed to the corresponding degree of torsion at each location as follows:

[0027] S3a, suppress according to the preset degree of distortion or difference;

[0028] S3b, after compression is complete, unload the compression pressure;

[0029] S3c, measure the degree of torsion at the corresponding position to determine the springback value;

[0030] S3d, press again based on the rebound value;

[0031] S3e, repeat steps S3b to S3d until the torsion after unloading the pressing pressure is consistent with the torsion at that position.

[0032] In one embodiment, the bending and twisting forming method of the bent and twisted steel plate further includes:

[0033] S4, The curvature smoothness of the initial steel plate after pressing is tested;

[0034] S5, and adjust the initial steel plate after pressing according to the test results.

[0035] The bending and twisting forming method for bent and twisted steel plates provided by this invention involves modeling a standard bent and twisted component and obtaining the curvature of the standard bent and twisted component. The initial steel plate is then pressed based on the obtained curvature. This method has high production efficiency and, compared to traditional hot bending forming, higher processing precision. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic flowchart of the bending and twisting forming method for the bent and twisted steel plate provided by the present invention.

[0038] Figure 2 A front view of the pressing die used in the bending and twisting forming method of the bending and twisting steel plate provided by the present invention.

[0039] Figure 3 A side view of the pressing die used in the bending and twisting forming method of the bent and twisted steel plate provided by the present invention.

[0040] Figure 4 This is a schematic diagram of the structure of the initial steel plate provided by the present invention placed in the pressing mold.

[0041] Figure 5 This is a schematic diagram of the structure of the initial steel plate being pressed by a pressing mold, as provided by the present invention. Detailed Implementation

[0042] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0044] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0045] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0046] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0047] Please refer to Figure 1 The bending and twisting forming method for bent and twisted steel plates provided by the present invention includes the following steps:

[0048] S1, determine the torsion of the end faces at both ends of the standard bending and torsion member along its length and the torsion of several cross sections of the standard bending and torsion member.

[0049] It can be understood that step S1 above further includes:

[0050] S101, Modeling a standard bending and torsion member.

[0051] It is understood that the standard bending and torsion member is the reference standard used during the initial steel plate pressing process described below. Modeling can be done according to a preset scale, and in this embodiment, it can be modeled to scale. Rhino 6 software can be used for modeling.

[0052] S102, establish a coordinate system based on the established standard bending and torsion member model.

[0053] Understandably, the standard bending and torsion member model is located in a coordinate system.

[0054] S103, mark several points on the standard bending and torsion member model to determine the first coordinate position of the cross section of the standard bending and torsion member at the end faces at both ends of the standard bending and torsion member model along the length direction and at the positions of the several points.

[0055] In this embodiment, several marker points can be set at equal intervals on the standard bending and twisting member model. It can be understood that the distance between the marker points can be measured along the bending and twisting direction between two marker points on the standard bending and twisting member model. The marker point can be a horizontal line that spans the width direction of the standard bending and twisting member model. The end face of the horizontal line that is perpendicular to the standard bending and twisting member model is the cross section corresponding to the marker point. The cross section of the standard bending and twisting member model can be a rectangle. Therefore, the first coordinate position of the end face and the cross section can be the coordinate position of the four endpoints of the rectangle.

[0056] S104, determine the torsion of the end face and the cross section corresponding to the marked point based on the coordinate position of the end face and the coordinate position of several cross sections.

[0057] Please see Figures 2 to 4 It can be known that the twist of the end face and the twist of the cross section can be the angle between the side edge in the width direction and the horizontal plane.

[0058] S2, arrange the pressing mold according to the position of the end faces at both ends of the standard bending and twisting component along the length direction and the position of the cross section of several standard bending and twisting components.

[0059] It is understood that step S2 above further includes:

[0060] S201, unfold the standard bending and torsion member model to obtain the unfolded torsion steel plate model.

[0061] It is understood that in this embodiment, unfolding refers to stretching in the length direction of the standard bending and twisting member model. One end face of the standard bending and twisting member model can be used as a reference point for stretching, or a point between the two ends of the standard bending and twisting member model can be used as a reference point for stretching. After stretching, the angle of twisting in the height direction of the standard bending and twisting member model will change until the length of the unfolded twisted steel plate model is consistent with the length of the initial steel plate described below.

[0062] S202, determine the second coordinate positions of the two end faces and several marker points along the length of the unfolded twisted steel plate model.

[0063] It is known that because the length of the unfolded torsion plate model is different from the length of the standard bending and torsion member model, the coordinate positions of its end face and the marked points will change relative to the coordinate system, forming a second coordinate position.

[0064] S203, the pressing mold is set up according to the second coordinate position.

[0065] It is understood that step S203 further includes:

[0066] S203a, the corresponding pressing mold is set up according to the second coordinate position at both ends of the unfolded twisted steel plate model.

[0067] It is known that a pressing mold is first placed in the preset layout space, one end of the unfolded twisted steel plate model is aligned with the pressing mold, and the position of the pressing mold corresponding to the other end is determined according to the position of the other end of the unfolded twisted steel plate model relative to the first end.

[0068] S203b, determine the second coordinate position of the mark point on the unfolded twisted steel plate model, determine the preset layout point position and lay out the corresponding pressing mold according to the second coordinate position of the mark point, and reserve a preset distance between the preset layout point position and the second coordinate position of the corresponding mark point.

[0069] It is known that after determining the pressing molds at both ends of the unfolded twisted steel plate model, the marking point can be a horizontal line, and its coordinate position can be represented by the coordinates at both ends. A preset distance is reserved between the layout point and the second coordinate position of the corresponding marking point. The setting of the preset distance can ensure a smooth transition of bending and twisting.

[0070] S3. Place the initial steel plate on the pressing mold, and press it sequentially according to the determined twist degree, starting from one end face along the length of the initial steel plate, until completion.

[0071] It is understandable that step S3 above further includes:

[0072] S301, place the end of the initial steel plate on the corresponding pressing mold, and place the position on the initial steel plate corresponding to the marked point on the unfolded twisted steel plate model on the other pressing molds.

[0073] It is understandable that the size and state of the unfolded twisted steel plate model and the initial steel plate are the same. First, determine the pressing mold corresponding to the end, and place the end on the corresponding pressing mold. Then, the positions of the remaining pressing molds and the initial steel plate will automatically correspond.

[0074] S302, Select one end face along the length of the initial steel plate and press it according to the torsion of the corresponding end face on a standard bending and torsion member;

[0075] S303, after pressing, select the position of the initial steel plate corresponding to the mark point adjacent to the end face of the initial steel plate, and calculate the difference between the torsion of the cross section of the initial steel plate corresponding to the adjacent mark point and the torsion of the selected end face.

[0076] It can be seen that after pressing one of the end faces to a preset degree of torsion, the curved surface of the initial steel plate corresponding to the adjacent mark point adjacent to the end face is pressed, and the difference between the degree of torsion of the cross section of the initial steel plate corresponding to the mark point and the degree of torsion of the end face is calculated. When the difference is positive, the torsion of the preset difference is pressed in the first direction. When the difference is negative, the torsion of the absolute value of the difference is pressed in the second direction. The second direction is opposite to the first direction.

[0077] S304, Press the position of the initial steel plate corresponding to the adjacent marked point according to the difference;

[0078] S305, repeat steps S303 and S304 above until the other end face of the initial steel plate is pressed in the length direction.

[0079] It is known that during the pressing process, because the initial steel plate has a certain degree of resilience, it is difficult to press it to the preset degree of torsion in one go. Therefore, the pressing process may include the following steps:

[0080] S3a, suppress according to the preset degree of distortion or difference;

[0081] S3b, after compression is complete, unload the compression pressure;

[0082] S3c, measure the degree of torsion at the corresponding position to determine the springback value;

[0083] S3d, press again based on the rebound value;

[0084] S3e, repeat steps S3b to S3d until the torsion after unloading the pressing pressure is consistent with the torsion at that position.

[0085] It can be understood that the rebound value can be understood as the difference between the preset twist degree and the twist degree at the corresponding position. This difference is generally positive because it is impossible to press it into place in one go. Therefore, the twist degree at the corresponding position will generally be less than the preset twist degree. Of course, there may also be a problem that the twist degree pressed is greater than the preset twist degree. In this case, the position can be pressed back. The above-mentioned twist degree can be measured by an electronic angle meter.

[0086] In some embodiments, the bending and twisting forming method for bent and twisted steel plates further includes:

[0087] S4, to test the curvature smoothness of the initial steel plate after pressing.

[0088] S5, and adjust the initial steel plate after pressing according to the test results.

[0089] Understandably, the adjustment could be made by refining the flame.

[0090] After the initial steel plate is pressed, the final steel plate is obtained. The final steel plate is the side plate along the length of the standard bending and twisting member, and its side can represent the height of the standard bending and twisting member. When assembling the standard bending and twisting member using this steel plate, the two ends of the final steel plate can be placed on the corresponding jig. The area between the two ends of the final steel plate will sag due to its own weight. The curvature generated by the sag is the curvature of the standard bending and twisting member. If there is an error between this curvature and the curvature of the standard bending and twisting member, it can be adjusted with a stock flame. After the two final steel plates are arranged, the other two side plates and the final steel plate are welded together. After welding, the stress between the side plates and the final steel plate can keep the final standard bending and twisting member in a stable state.

[0091] Please see Figure 2 and Figure 3 In this embodiment, the pressing mold includes a hydraulic press and a mold. The hydraulic press may include several main bases 1, several hydraulic rods, and a hydraulic controller. The number of hydraulic rods is the same as the number of pressing rods. The hydraulic rods are mounted on an open receiving space on the main bases. The hydraulic controller can control several hydraulic rods individually or uniformly. The mold includes a fixed plate 201, an upper mold 202, and a lower mold 203. The upper mold 202 includes two first triangular plates and a second triangular plate. The first and second triangular plates are connected to the hydraulic rods through the fixed plate 201, and a certain distance is reserved between the first and second triangular plates. The lower mold 203 includes a third triangular plate and a fourth triangular plate. The third and fourth triangular plates are respectively arranged on the lower inner wall of the receiving space, and the first and third triangular plates are opposite each other, as are the second and fourth triangular plates. The hydraulic rods are mounted on the upper inner wall of the open receiving space. Please refer to [link to relevant documentation]. Figures 4 to 5 The figure shows the pressing process of the pressing die on the initial steel plate 3. The torsion measurement during the pressing process can be carried out by an electronic angle meter, which can be placed on the lower die 203.

[0092] As described above, the bending and twisting steel plate forming method provided by the present invention involves modeling a standard bending and twisting component and obtaining the curvature of the standard bending and twisting component. The initial steel plate is then pressed based on the obtained curvature, resulting in high production efficiency and higher processing precision compared to traditional hot bending forming.

[0093] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for bending and twisting steel plates, characterized in that, Includes the following steps: S1, determine the torsion of the end faces at both ends of the standard bending and torsion member along its length and the torsion of several cross sections of the standard bending and torsion member. S101, Modeling standard bending and torsion members; S102, Establish a coordinate system based on the established standard bending and torsion member model; S103, mark several marker points on the standard bending and torsion member model to determine the first coordinate position of the cross section of the standard bending and torsion member at the end faces at both ends in the length direction of the standard bending and torsion member and at the positions of several marker points. S104, determine the torsion degree of the end face and the cross section corresponding to the marked point based on the coordinate position of the end face and the first coordinate position of the plurality of cross sections; S2, The pressing mold is arranged according to the position of the end faces of the two ends of the standard bending and twisting component along the length direction and the position of the cross section of the standard bending and twisting component. S201, unfold the standard bending and twisting member model to obtain an unfolded twisted steel plate model; S202, determine the second coordinate positions of the two end faces and several marked points along the length direction of the unfolded twisted steel plate model; S203, the pressing mold is arranged according to the second coordinate position; S3, Place the initial steel plate on the pressing mold, and press it sequentially according to a determined degree of torsion, starting from one end face along the length of the initial steel plate, until completion, including: S301, the end of the initial steel plate is placed on the corresponding pressing mold, and the position on the initial steel plate corresponding to the marked point on the unfolded twisted steel plate model is placed on the other pressing molds. S302, Select one end face of the initial steel plate along its length and press it according to the torsion degree of the corresponding end face on the standard bending and twisting member; S303, After pressing, select the position of the initial steel plate corresponding to the mark point adjacent to the end face of the initial steel plate, and calculate the difference between the torsion of the cross section of the initial steel plate corresponding to the adjacent mark point and the torsion of the selected end face. S304, Press the position of the initial steel plate corresponding to the adjacent marked point according to the difference; S305, repeat steps S303 and S304 above until the other end face of the initial steel plate is pressed in the length direction.

2. The bending and twisting forming method for bent and twisted steel plates as described in claim 1, characterized in that, Step S203, which involves arranging the pressing mold according to the second coordinate position, further includes: S203a, according to the second coordinate positions corresponding to both ends of the unfolded twisted steel plate model, the corresponding pressing mold is arranged; S203b, determine the second coordinate position of the mark point on the unfolded twisted steel plate model, determine the preset layout point position according to the second coordinate position of the mark point, and lay out the corresponding pressing mold. A preset distance is reserved between the preset layout point position and the corresponding second coordinate position of the mark point.

3. The bending and twisting forming method for bent and twisted steel plates as described in claim 1, characterized in that, The method by which the initial steel plate is pressed to the corresponding degree of torsion at each location is as follows: S3a, suppress according to the preset degree of distortion or difference; S3b, after compression is complete, unload the compression pressure; S3c, measure the degree of torsion at the corresponding position to determine the springback value; S3d, press again based on the rebound value; S3e, repeat steps S3b to S3d until the torsion after unloading the pressing pressure is consistent with the torsion at that position.

4. The bending and twisting forming method for bent and twisted steel plates as described in claim 1, characterized in that, The bending and twisting method for the steel plate further includes: S4, The curvature smoothness of the initial steel plate after pressing is tested; S5, and adjust the initial steel plate after pressing according to the test results.

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