Method of forming a bent plate

Abstract

The application discloses a kind of bending plate flanging forming methods, by setting up flanging forming roller left end and flanging workbench gap, to limit the initial position of flanging forming roller, then with the generatrix end of flanging forming roller as the reference point of flanging, establish local rectangular coordinate system, according to flanging angle and rotation speed, quickly determine the real-time state of flanging forming roller in plate flanging forming process, so that the reference point of forming roller is always located at the junction of to-be-flanged area and flanged area, and the forming roller is always tangent to the to-be-flanged area, to control the transition fillet of flanging part in flanging forming process unchanged.The application can quickly determine the real-time position of flanging forming roller in plate flanging forming process, so that the reference point of forming roller is always located at the junction of to-be-flanged area and flanged area, and the forming roller is always tangent to the to-be-flanged area, to ensure that the transition fillet of flanging part in flanging forming process is unchanged, suppresses the springback of flanging part, significantly improves the flanging forming quality, and has important engineering application value and obvious economic benefits in engineering fields such as aviation, aerospace and automobile manufacturing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sheet metal forming, and particularly relates to a bending type plate flanging forming method. BACKGROUND

[0002] Large-size sheet metal flanging components are widely used in the manufacturing and processing fields of aerospace and automobiles. Roll flanging is a new flexible flanging method. However, when the existing roll flanging forming is adopted, the flanging forming roll always rotates at a flanging reference point to form a flanging angle, so that the material in the flanging transition zone is hardened, the springback is increased and difficult to compensate, and the forming quality and consistency are difficult to guarantee. Therefore, a new plate flanging method needs to be developed to solve the current manufacturing problem of sheet metal flanging structural components. SUMMARY

[0003] The present application aims at the problem that the forming roll always rotates at a flanging reference point to form a flanging angle in the forming process of the existing plate flanging forming technology, the material processing in the flanging zone gradually increases with the flanging, and the final part has large springback and is difficult to compensate. A bending type plate flanging forming method is provided, which can quickly determine the real-time position of the flanging forming roll in the plate flanging forming process, so that the reference point of the forming roll is always located at the junction of the to-be-flanged zone and the flanged zone, and the forming roll always maintains tangential relationship with the to-be-flanged zone, thereby ensuring that the transition fillet of the flanged part is constant in the flanging forming process, suppressing the springback of the flanged part, significantly improving the flanging forming quality, and having important engineering application value and obvious economic benefits in the engineering fields of aviation, aerospace, automobile manufacturing and the like.

[0004] The present application is implemented by the following technical solutions:

[0005] The present application relates to a bending type plate flanging forming method. The initial position of the flanging forming roll is limited by setting the gap between the left end of the flanging forming roll and the flanging workbench, a local rectangular coordinate system is established with the generatrix end of the flanging forming roll as the flanging reference point, the real-time state of the flanging forming roll in the plate flanging forming process is quickly determined according to the flanging angle and the rotation speed, so that the reference point of the forming roll is always located at the junction of the to-be-flanged zone and the flanged zone, and the forming roll always maintains tangential relationship with the to-be-flanged zone, and then the transition fillet of the flanged part in the flanging forming process is controlled to be constant.

[0006] The initial position refers to that the generatrix of the horizontally placed flanging forming roll is located on the lower plane of the plate on the flanging workbench, and the left end of the flanging forming roll is located at a horizontal distance of the preset gap from the flanging workbench.

[0007] The flanging reference point refers to the left end of the generatrix of the flanging forming roll in contact with the plate.

[0008] The quick determination refers to: calculating the vertical direction displacement and the horizontal direction displacement of the flanging forming roller according to the flanging angle of the flanging forming roller; calculating the vertical direction movement speed and the horizontal direction movement speed of the flanging forming roller according to the self-rotation speed of the flanging forming roller, and specifically comprising: the vertical direction displacement of the flanging forming roller at any i moment , the horizontal direction displacement of the forming roller at any i moment ; the vertical direction movement speed of the flanging forming roller ; the horizontal direction movement speed of the flanging forming roller , wherein: t is the target flanging piece thickness, r is the inside radius of the flanging piece transition area, phi i is the flanging angle at any i moment, c is the gap between the left end of the flanging forming roller and the flanging workbench, is the self-rotation speed of the forming roller.

[0009] The control of the constant flanging piece transition fillet during the flanging forming process and the suppression of the flanging piece springback are specifically implemented in the following manner: when the flanging forming roller is self-rotated at a speed v r to gradually form the flanging angle, according to the calculated vertical direction movement speed v H and the horizontal direction movement speed v L , the forming roller is constantly moved along the vertical direction and the vertical direction, so that the reference point of the forming roller is always located at the junction of the to-be-flanged area and the flanged area during the entire forming process, and the forming roller always maintains the tangential relationship with the to-be-flanged area.

[0010] Technical effects

[0011] The application adds the calculation of the movement of the forming roller along the vertical direction and the vertical direction during the self-rotation of the forming roller to form the flanging angle, and further optimizes the movement track of the forming roller during the flanging forming process. Compared with the prior art, the application can quickly determine the real-time position of the flanging forming roller during the plate flanging forming process, so that the reference point of the forming roller is always located at the junction of the to-be-flanged area and the flanged area, and the forming roller always maintains the tangential relationship with the to-be-flanged area, thereby ensuring that the flanging piece transition fillet is constant during the flanging forming process, suppressing the flanging piece springback, and significantly improving the flanging forming quality. DRAWINGS

[0012] Figure 1 is the flowchart of the application;

[0013] Figure 2 is the position schematic diagram of the embodiment;

[0014] Figure 3 is the vertical direction displacement change diagram of the flanging forming roller during the forming process of the embodiment;

[0015] Figure 4 Figure 4 is a diagram of horizontal direction displacement variation of the flanging forming roller in the forming process of the embodiment;

[0016] Figure 5 Figure 5 is a diagram of vertical direction speed variation of the flanging forming roller in the forming process of the embodiment;

[0017] Figure 6 Figure 6 is a diagram of horizontal direction speed variation of the flanging forming roller in the forming process of the embodiment;

[0018] Figure 7 Figure 7 is a comparative diagram of rebound angles of the embodiment;

[0019] In the figure: 1-1 is the pressing part of the pressing die, 1-2 is the transition fillet part of the pressing die, 2 is the flanging workbench, 3 is the plate, 4-1 is the flanging forming roller at the initial position, and 4-i is the flanging forming roller at any i moment. DETAILED DESCRIPTION

[0020] As shown in the figure, the target flanging part of the embodiment adopts 5A06 aluminum alloy, the thickness t is 2 mm, the inside radius r of the transition zone of the flanging part is 3 mm, and the flanging opening angle φ is 70°. As shown in the figure, the leftmost end of the transition fillet part 1-2 of the pressing die is aligned with the flanging workbench 2, the flanging forming roller is horizontally placed, the generatrix thereof is located at the lower plane of the plate 3 placed on the flanging workbench 2, and the left end thereof has a gap c of 1 mm with the flanging workbench 2. Figure 2 Figure 3 As shown in the figure, the target flanging part of the embodiment adopts 5A06 aluminum alloy, the thickness t is 2 mm, the inside radius r of the transition zone of the flanging part is 3 mm, and the flanging opening angle φ is 70°. As shown in the figure, the leftmost end of the transition fillet part 1-2 of the pressing die is aligned with the flanging workbench 2, the flanging forming roller is horizontally placed, the generatrix thereof is located at the lower plane of the plate 3 placed on the flanging workbench 2, and the left end thereof has a gap c of 1 mm with the flanging workbench 2.

[0021] As shown in the figure, the target flanging part of the embodiment adopts 5A06 aluminum alloy, the thickness t is 2 mm, the inside radius r of the transition zone of the flanging part is 3 mm, and the flanging opening angle φ is 70°. As shown in the figure, the leftmost end of the transition fillet part 1-2 of the pressing die is aligned with the flanging workbench 2, the flanging forming roller is horizontally placed, the generatrix thereof is located at the lower plane of the plate 3 placed on the flanging workbench 2, and the left end thereof has a gap c of 1 mm with the flanging workbench 2. Figure 1 As shown in the figure, the target flanging part of the embodiment adopts 5A06 aluminum alloy, the thickness t is 2 mm, the inside radius r of the transition zone of the flanging part is 3 mm, and the flanging opening angle φ is 70°. As shown in the figure, the leftmost end of the transition fillet part 1-2 of the pressing die is aligned with the flanging workbench 2, the flanging forming roller is horizontally placed, the generatrix thereof is located at the lower plane of the plate 3 placed on the flanging workbench 2, and the left end thereof has a gap c of 1 mm with the flanging workbench 2.

[0022] 1) Taking the left end point of the generatrix of the flanging forming roller in contact with the plate 3 as the flanging reference point, a Cartesian coordinate system is established at the point, the horizontal direction is the generatrix direction of the flanging forming roller, and the vertical direction is the radial direction of the left end of the flanging forming roller. In the subsequent flanging forming process, the flanging forming roller rotates around the flanging reference point to form a flanging angle.

[0023] 2) The vertical direction displacement H i of the flanging forming roller at any i moment is determined as: The distance d of the intersection point of the extended line to the flanging workbench 2 from the flanging reference point in the horizontal direction is determined. Then, the horizontal direction displacement x of the flanging forming roller 4 at any i moment is calculated.

[0024] 3) The rotation speed v r of the flanging forming roller is set to 1° / s, and the vertical direction movement speed v H of the flanging forming roller is:​ Set the rotation speed v of the flanging forming roller. r If the speed is 1° / s, then the horizontal speed of the flanging forming roller is v. L for: .

[0025] like Figure 3 and Figure 4 As shown, the displacement changes of the forming roller along the vertical and longitudinal directions during the flanging process are calculated using the above method. When the rotational speed v of the flanging forming roller... r When the speed is set to 1° / s, the vertical speed v of the forming roller during the flanging process can be obtained by solving. H and horizontal velocity v L , respectively Figure 5 and Figure 6 As shown. Then according to v H v L and v r This allows for the generation of the motion trajectory of a target flanged part with a 70° flanging angle, saving the process parameters at this point, and then executing the actual flexible flanging forming. A comparison is made between the springback angle of the flanged part obtained using this method and the springback angle of existing technologies. Figure 7 As shown. Compared to the maximum springback angle of 2.4° obtained by existing flanging technology, the maximum springback angle of the flanged part obtained by the present invention is 0.5°, which significantly improves the forming quality of the flanged part.

[0026] Compared with the prior art, the present invention adds vertical and longitudinal movement of the forming roller during the process of forming the flanged part by rotating the forming roller, thereby optimizing the movement trajectory of the forming roller during the flanging process. Moreover, the present invention is simple and feasible, and can quickly determine the real-time position of the flanging forming roller during the flanging process of the sheet metal. This ensures that the reference point of the forming roller is always located at the junction of the area to be flanged and the area that has been flanged, and that the forming roller always maintains a tangential relationship with the area to be flanged. This ensures that the transition radius of the flanged part remains unchanged during the flanging process, suppresses the springback of the flanged part, and significantly improves the flanging quality.

[0027] The above-described specific implementations can be partially adjusted by those skilled in the art in different ways without departing from the principles and purpose of the present invention. The scope of protection of the present invention is defined by the claims and is not limited to the above-described specific implementations. All implementation schemes within the scope of the claims are bound by the present invention.

Claims

1. A method of bend-type plate flanging forming, characterized by, By setting the gap between the left end of the flanging forming roller and the flanging workbench, the initial position of the flanging forming roller is defined, then a local rectangular coordinate system is established with the generatrix end of the flanging forming roller as the flanging reference point, the real-time state of the flanging forming roller in the flanging forming process of the plate is quickly determined according to the flanging angle and the rotation speed, so that the reference point of the forming roller is always located at the junction of the to-be-flanged area and the flanged area, and the forming roller always maintains a tangent relationship with the to-be-flanged area, thereby controlling the transition fillet of the flanged part to be constant during the flanging forming process. The quick determination refers to: calculating the vertical displacement and horizontal displacement of the flanging forming roller according to the flanging angle of the flanging forming roller; calculating the vertical movement speed and horizontal movement speed of the flanging forming roller according to the rotation speed of the flanging forming roller. The rapid determination specifically comprises vertical direction displacement of the flanging forming roller at any i moment , horizontal direction displacement of the forming roller at any i moment , vertical direction movement speed of the flanging forming roller , horizontal direction movement speed of the flanging forming roller , distance between the intersection position of the extension line at any i moment and the flanging workbench , horizontal distance of the flanging reference point , t is the target flanging thickness, r is the inside radius of the flanging transition area, φ i is the flanging angle at any i moment, , c is the gap between the left end of the flanging forming roller and the flanging workbench, is the self-rotation speed of the forming roller.

2. The rotary bending sheet flanging method according to claim 1, wherein The initial position refers to: the generatrix of the horizontally placed flanging forming roller is located at the lower plane of the plate on the flanging workbench, and the left end of the flanging forming roller is located at a horizontal distance of a preset gap from the flanging workbench.

3. The rotary bending sheet flanging method according to claim 1, wherein The flanging reference point refers to: the left end of the generatrix of the flanging forming roller in contact with the plate.

4. The rotary bending sheet flanging method according to claim 1, wherein The control method can keep the transition round corner of the flanging part unchanged and inhibit the springback of the flanging part during the flanging forming process. r When the revolution gradually forms the flanging angle, the vertical direction movement speed v H and the horizontal direction movement speed v L are calculated, the forming roller continuously moves along the vertical direction and the vertical direction, so that the reference point of the forming roller is always located at the junction of the to-be-flanged area and the flanged area during the whole forming process, and the forming roller always maintains the tangential relationship with the to-be-flanged area.

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