A method of press forming a space warp curved panel

Abstract

The present application relates to the technical field of curved panel processing, and aims to solve the problem that the size of the curved panel of the space curve steel tower of the existing large bridge is large, it is difficult to form once by using a mold, and the forming precision is difficult to control, and provides a space twisted curved panel pressing forming method, comprising the following steps: S1: establishing a twisted component model and unfolding; S2: importing the unfolded drawing of the twisted curved panel into a numerical control cutting machine to cut the wall panel; S3: according to the linear angle of the wall panel end face, a plurality of equally spaced bending lines are drawn parallel to the linear shape of the wall panel end face; S4: obtaining the bending angle of the bending line; S5: inputting the bending angle of the same position of the inner and outer arcs of the twisted curved panel into the bending equipment, and pressing the twisted curved panel into shape through the bending equipment. By using the above method, the space twisted curved panel can be quickly pressed, the curved degree of the curved panel can be accurately controlled, and it is ensured that the cable tower meets the quality requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of curved panel processing, in particular to a space twist curved panel press forming method. BACKGROUND

[0002] With the rapid development of urbanization process in China, the scale of urban bridge construction is increasing day by day, and the bridge has been included in the important constituent elements of urban buildings. In addition to meeting the basic traffic function, the bridge is endowed with more symbolic function and cultural connotation, and the large-span steel tower cable-stayed bridge with complex spatial modeling has attracted widespread attention.

[0003] A certain super large bridge has a length of 513m, a tower height of 173m, and a bridge deck standard width of 64m. The main bridge adopts a single-tower double-cable-plane cable-stayed bridge, the cable tower is a spatial curved steel tower, the outer wall panels of the cable tower are all space twist curved panels, and the main girder is a steel box girder structure. The processing and forming of the space twist panels of the cable tower are very critical. Since the twist panel thickness of the cable tower reaches 40mm, the curved panel area is 10㎡-60㎡, the curved panel size is large, it is difficult to form once by using a mold, and the forming precision is difficult to control. SUMMARY

[0004] The present application aims to provide a space twist curved panel press forming method to solve the problem of large size of the curved panel of the spatial curved steel tower of the super large bridge, difficulty in one-time forming by using a mold, and difficulty in controlling the forming precision in the prior art.

[0005] The present application is implemented by using the following technical solutions:

[0006] The present application provides a space twist curved panel press forming method, comprising the following steps:

[0007] S1: Establishing a twist component model and unfolding:

[0008] Establishing a main tower outer wall panel model, the main tower outer wall panel being a spatial twist component, the main tower outer wall panel being split into a plurality of twist curved panels according to a main tower segmentation and blocking scheme, and the twist curved panels being unfolded;

[0009] S2: Cutting the wall panel:

[0010] The unfolded drawing of the twist curved panel is imported into a numerical control cutting machine to cut the wall panel;

[0011] S3: Drawing the curved panel bending line:

[0012] According to the wall panel end face line angle, a plurality of equally spaced bending lines are drawn parallel to the wall panel end face line;

[0013] S4: Obtaining the bending angle of the bending line:

[0014] According to the model established in S1, three-dimensional coordinates of each point on the inner and outer profiles of the twisted curved panel are obtained, curves of the inner and outer profiles of the twisted curved panel are drawn, and the bending angles of the inner and outer arcs of the twisted curved panel are marked according to the bending lines;

[0015] S5: pressing by a bending device:

[0016] The bending angles of the inner and outer arcs of the twisted curved panel at the same position are input into the bending device, then the panel bending lines are aligned with the cutting edges of the bending device, each bending line is pressed in turn from one end of the panel to the other end, and process measurement control is performed by using an angle template, so that the twisted curved panel is pressed and formed.

[0017] By using the above method, the spatial twisted curved panel can be quickly pressed and the camber of the curved panel can be accurately controlled, so that the quality requirements of the pylon are met.

[0018] As a preferred technical solution:

[0019] In S1, a model of the outer panel of the main tower is established by using TEKLA three-dimensional modeling software.

[0020] As a preferred technical solution:

[0021] The distance between the two adjacent bending lines is calculated according to the following formula:

[0022] B=t*10+30mm

[0023] Wherein, t is the thickness of the panel, and the unit is mm.

[0024] As a preferred technical solution:

[0025] The distance between the two adjacent bending lines is 240-500mm.

[0026] As a preferred technical solution:

[0027] In S2, the numerical control cutting machine is a numerical control plasma cutting machine.

[0028] As a preferred technical solution:

[0029] In S5, the bending device is a numerical control bending machine, and the pressing is automatically controlled by the numerical control bending machine.

[0030] As a preferred technical solution:

[0031] In S5, the bending angles of the inner and outer arcs of the twisted curved panel at the same position are input into the two hydraulic cylinders of the bending device.

[0032] As a preferred technical solution, the beneficial effects of the present application are:

[0033] 1. The application models the space twist component by using TEKLA three-dimensional modeling software, then expands it, and cuts the wallboard to be processed according to the expansion drawing, so that the wallboard with accurate size can be obtained, thereby providing a basis for the space twist curved surface panel forming.

[0034] 2. The application can easily and accurately find the three-dimensional coordinate values of each point on the twist curved surface panel, draw the curves of the inner and outer contours of the twist curved surface panel, mark the twist curved surface panel inner and outer arc bending angles according to the selected and determined bending lines, obtain the inner and outer arc bending angles corresponding to each bending line, accurately find the relative relationship between the inner and outer arcs, and provide data support for accurately controlling the space curved surface bending.

[0035] 3. The bending equipment of the application automatically controls the pressing of the wallboard bending line according to the inner and outer arc bending angles, and realizes the accurate pressing forming of the space twist curved surface panel.

[0036] 4. The application has strong applicability and can be applied to the pressing forming of space twist wallboards with different twist degrees. DETAILED DESCRIPTION

[0037] Figure 1 A schematic view of a twist surface formed by the combination of curves with different curvatures.

[0038] Figure 2 A schematic view of a bending line with the same slope.

[0039] Figure 3 A model view of the outer wallboard segment of the main tower.

[0040] Figure 4 An expansion view of the outer wallboard of the main tower.

[0041] Figure 5 A bending line view of the outer wallboard of the main tower.

[0042] Figure 6 A twist surface space coordinate schematic view of the outer wallboard of the main tower.

[0043] Figure 7 A bending angle label number schematic view.

[0044] Figure 8 A flowchart of the space twist curved surface panel pressing forming method according to the application. DETAILED DESCRIPTION

[0045] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the protection scope of the present application.

[0046] Embodiment 1

[0047] As shown in the drawings, the present embodiment proposes a space twist curved panel press forming method, comprising the following steps: Figure 8

[0048] S1: Establishing a twist component model and unfolding

[0049] A TEKLA three-dimensional modeling software is used to establish a model of the outer wall panel of the main tower (as shown in the drawings), the outer wall panel of the main tower is a space twist component, the outer wall panel of the main tower is split into a plurality of twist curved panels according to a segmented block scheme of the main tower, and the twist curved panels are unfolded (as shown in the drawings); Figure 3 Figure 4

[0050] S2: Cutting the wall panel

[0051] The unfolded drawing of the twist curved panel is imported into a numerical control plasma cutting machine to cut the wall panel;

[0052] S3: Drawing the bending line of the curved panel

[0053] According to the angle of the end face line of the wall panel, a plurality of equally spaced bending lines are drawn in parallel with the end face line of the wall panel (as shown in the drawings), the distance B between the two adjacent bending lines is t*10+30 mm, and t is the thickness of the wall panel in mm; Figure 5

[0054] S4: Obtaining the bending angle of the bending line

[0055] According to the model established in S1, the three-dimensional coordinates of each point on the inner and outer contours of the twist curved panel are obtained (as shown in the drawings), the curves of the inner and outer contours of the twist curved panel are drawn, and the inner and outer arc bending angles of the twist curved panel are labeled according to the bending lines (as shown in the drawings); Figure 6 Figure 7

[0056] S5: Pressing by a bending equipment

[0057] ​​​​​​The bending angle of the same position of the inner and outer arcs of the twisted curved panel is input into the bending equipment, specifically, is input into the two hydraulic cylinders (α1 and α2) of the bending equipment, then the bending line of the wall panel is aligned with the cutting edge of the bending equipment, each bending line is pressed in turn from one end of the wall panel to the other end, and the process is measured and controlled by using the angle template, so that the twisted curved panel is pressed and formed.

[0058] In the embodiment, in S3, the interval of the two adjacent bending lines is 240-500 mm.

[0059] In the embodiment, in S5, the bending equipment adopts a numerical control bending machine, and the pressing is automatically controlled by the numerical control bending machine.

[0060] The pressing principle of the twisted curved panel is as follows:

[0061] The space curved panel is actually a curved surface composed of many lines with different curvatures (as shown in FIG. 1), and a curve can be obtained by bending with many knives. Because the upper die of the bending equipment is a straight line, a line with the same slope (as shown in FIG. 2) is found on the curved panel, the line is taken as a bending line, the bending angle of the inner and outer arc bending lines is drawn, and the panel is twisted by pressing and bending the bending lines one by one through the bending equipment. Figure 1 Figure 2 The present application can easily and accurately find the three-dimensional coordinate values of each point on the twisted curved panel, draw the curve of the inner and outer contours of the twisted curved panel, and label the bending angle of the inner and outer arcs of the twisted curved panel according to the bending line determined in S3, so as to obtain the corresponding inner and outer arc bending angles of each bending line, accurately find the relative relationship between the inner and outer arcs, and provide data support for accurately controlling the space curved bending.

[0062] The bending equipment of the present application automatically controls the pressing of the wall panel bending line according to the inner and outer arc bending angle, and realizes the accurate pressing and forming of the space twisted curved panel.

[0063] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.​

Claims

1. A method for pressing and forming a spatially twisted panel, characterized in that: Includes the following steps: S1: Create and expand the model of the twisted component: Establish a model of the outer wall panel of the main tower. The outer wall panel of the main tower is a spatial twisted component. According to the segmentation and block division scheme of the main tower, the outer wall panel of the main tower is divided into multiple twisted curved panels, and the twisted curved panels are unfolded. S2: Cutting the wall panel: Import the unfolded diagram of the twisted panel into the CNC cutting machine for blanking and cutting of the panel; S3: Draw the bend line of the curved panel: Based on the angle of the end face of the wall panel, draw multiple equally spaced bending lines parallel to the end face of the wall panel; S4: Obtain the bending angle of the bend line: Based on the model established in S1, obtain the three-dimensional coordinates of each point on the inner and outer contours of the twisted panel, draw the curves of the inner and outer contours of the twisted panel, and mark the bending angles of the inner and outer arcs of the twisted panel according to the bending lines. S5: Pressing via bending equipment: Input the bending angle of the inner and outer arcs of the twisted panel at the same position into the bending equipment, then align the bending line of the panel with the cutting edge of the bending equipment, press each bending line sequentially from one end of the panel to the other, and use an angle template for process measurement and control, thereby pressing the twisted panel into shape. In S1, the TEKLA 3D modeling software was used to create a model of the outer wall panel of the main tower. The spacing between two adjacent bend lines is calculated using the following formula: B=t 10+30mm Where t is the thickness of the wall panel, in mm; In S5, the bending equipment adopts a CNC bending machine, which automatically controls the pressing. In S5, the bending angles at the same position on the inner and outer arcs of the twisted panel are input to the hydraulic cylinders on both sides of the bending equipment.

2. The method for pressing and forming a spatially twisted panel according to claim 1, characterized in that: The distance between two adjacent bending lines is 240~500mm.

3. The method for pressing and forming a spatially twisted panel according to claim 1, characterized in that: In S2, the CNC cutting machine adopts a CNC plasma cutting machine.

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