Fan-shaped plate bending process

Abstract

The invention discloses a fan-shaped plate bending process, a plate comprises a main body, a first bending part, a second bending part and two third bending parts, the main body is fan-shaped, the plate is processed by a stamping device, a plurality of first deformation grooves are stamped at the first bending part, the plurality of first deformation grooves are arranged along the length direction of the first bending part, and the second bending part is arranged along the length direction of the second bending part; a plurality of second deformation grooves are punched in the second bending part, the second deformation grooves are distributed in the length direction of the second bending part, the punched plate is placed in a bending device to be bent, the first deformation grooves are gradually folded when the first bending part is bent, and the second deformation grooves are gradually expanded when the second bending part is bent; the whole plate is stamped and bent to form the three-dimensional fan-shaped plate, so that the structural strength of the manufactured plate is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet metal bending, and more specifically, to a bending process for a fan-shaped sheet metal part. Background Art

[0002] In the prior art, aluminum alloy sheet metal parts are widely used in curtain wall decoration. The aluminum alloy sheet metal parts are processed through cutting, bending, riveting, etc. The existing fan-shaped curtain wall panels are composed of a fan-shaped flat plate and multiple side plates, and the splicing method is welding or riveting. The structural strength of the fan-shaped curtain wall panel formed by splicing is relatively low, and fractures or looseness may occur at the splicing joints. Therefore, a technical solution is needed to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above deficiencies of the prior art, and provide a bending process for a fan-shaped sheet metal part by integrally bending the sheet metal part to form a wall panel with higher strength.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] The present invention discloses a bending process for a fan-shaped sheet metal part, including the following steps:

[0006] S1. Cut out a sheet metal part. The sheet metal part includes a main body, a first bending part, a second bending part, and two third bending parts. The main body is fan-shaped. The first bending part is located at the large-diameter arc of the main body. The second bending part is located at the small-diameter arc of the main body. The two third bending parts are respectively located at both ends of the main body.

[0007] S2. Process the sheet metal part through a stamping device. The sheet metal part is fixed to the fixture assembly of the stamping device. The stamping die of the stamping device is used to stamp the first bending part and the second bending part. A plurality of first deformation grooves are stamped at the first bending part, and the plurality of first deformation grooves are arranged along the length direction of the first bending part. A plurality of second deformation grooves are stamped at the second bending part, and the plurality of second deformation grooves are arranged along the length direction of the second bending part.

[0008] S3. Place the stamped sheet metal part in a bending device for bending. The second upper die and the second lower die of the bending device are brought close to each other and pressed together. The main body is placed on the upper end surface of the second lower die. The second upper die presses down to bend the first bending part and the second bending part. The first deformation grooves gradually converge when the first bending part is bent, and the second deformation grooves gradually expand when the second bending part is bent.

[0009] S4. Bend the two third bending parts, and the third bending parts are bent in the bending direction of the first bending part and the second bending part.

[0010] Further, the plate member includes an inner surface and an outer surface, and the first bending portion, the second bending portion, and the third bending portion are bent toward the inner surface direction.

[0011] Further, the stamping die includes a first upper die and a first lower die. The first upper die is provided with a pressing block, and the first lower die is provided with a pressing groove corresponding to the pressing block. The pressing block is triangular pyramid-shaped, and the pressing block and the pressing groove press the first bending portion or the second bending portion to deform, thereby forming the first deformation groove or the second deformation groove.

[0012] Further, the pressing block includes a pressing edge, and the pressing edge is inclined in the vertical direction. One end of the pressing edge is inclined toward the direction close to the first lower die, and the opening size of the first deformation groove or the second deformation groove expands toward the direction away from the main body.

[0013] Further, the fixture assembly includes a first clamping plate and a second clamping plate. The first clamping plate and the second clamping plate clamp the plate member. The boundary between the main body and the first bending portion is the first bending line, and the boundary between the main body and the second bending portion is the second bending line. The edges of the first clamping plate and the second clamping plate are aligned with the first bending line or the second bending line.

[0014] Further, the fixture assembly during stamping the first bending portion in step S2 includes a telescopic rod, a motor, and a slide rail. The first clamping plate is provided with a fixed frame, and a pressing column is installed on the fixed frame. The pressing column presses the second clamping plate and the first clamping plate together. The first clamping plate is connected to the telescopic rod, the telescopic rod is connected to the motor, the rotation axis of the motor coincides with the center of the plate member, the motor is installed on the slide rail, and the motor can approach or move away from the stamping die.

[0015] Further, the second upper die includes an upper die body and a pressing plate. The pressing plate is slidably connected to the upper die body. When the second upper die presses down to bend the first bending portion and the second bending portion, the pressing plate presses the upper end surface of the main body.

[0016] Further, a guiding channel is opened on the upper die body, a guiding plate is provided on the pressing plate, the guiding plate passes through the guiding channel, a limiting plate is provided at one end of the guiding plate away from the pressing plate, and a plurality of springs are installed between the pressing plate and the upper die body. The plurality of springs are arranged along the length direction of the pressing plate, and the springs are distributed on both sides of the guiding plate.

[0017] Further, the upper die body includes a bending groove which opens towards the direction of the second lower die. Two side walls of the bending groove form a first pressing surface and a second pressing surface. The first pressing surface presses and bends the first bending part, and the second pressing surface presses and bends the second bending part. Lower ends of two side surfaces of the second lower die are inclined and close to each other.

[0018] Further, the first pressing surface includes a first arc surface and a first straight surface, and the first straight surface is located at the upper end of the first arc surface. The second pressing surface includes a second arc surface and a second straight surface, and the second straight surface is located at the upper end of the second arc surface.

[0019] The beneficial effects of the present invention are as follows:

[0020] In the present invention, a three-dimensional fan-shaped plate member is formed by stamping and bending a whole plate member. The plate member is processed by a stamping device, a plurality of first deformation grooves are stamped at the first bending part, and a plurality of second deformation grooves are stamped at the second bending part. The stamped plate member is placed in a bending device for bending. The first deformation grooves gradually converge when the first bending part is bent, and the second deformation grooves gradually expand when the second bending part is bent, so that the formed plate member has higher structural strength, more convenient processing and higher production efficiency. Description of the Drawings

[0021] Figure 1 It is an initial schematic diagram of the plate member in this embodiment.

[0022] Figure 2 It is a schematic diagram of the bent plate member in this embodiment.

[0023] Figure 3 It is a schematic diagram of a stamping device during stamping of the first bending part in this embodiment.

[0024] Figure 4 It is Figure 3 a side view of the stamping device in

[0025] Figure 5 It is a schematic diagram of a bending device in this embodiment.

[0026] Figure 6 It is a cross-sectional view of the bending device in the initial state in this embodiment.

[0027] Figure 7 It is a sectional view of the bending device when bending the plate member in this embodiment.

[0028] Reference numerals: 1, plate member; 11, main body; 111, first bending line; 112, second bending line; 12, first bending portion; 121, first deformation groove; 13, second bending portion; 131, second deformation groove; 14, third bending portion; 101, inner surface; 102, outer surface; 2, stamping device; 21, stamping die; 211, first upper die; 2111, pressing block; 21111, bead; 212, first lower die; 2121, pressing groove; 22, fixture assembly; 221, first clamping plate; 2211, fixing bracket; 2212, pressing column; 222, second clamping plate; 223, telescopic rod; 224, motor; 225, slide rail; 3, bending device; 31, second upper die; 311, upper die body; 3111, bending groove; 3112, first pressing and folding surface; 31121, first arc surface; 31122, first straight surface; 3113, second pressing and folding surface; 31131, second arc surface; 31132, second straight surface; 3114, guiding channel; 312, pressing plate; 3121, guiding plate; 3122, limiting plate; 313, spring; 32, second lower die. Detailed implementation mode

[0029] Next, the technical solutions in this embodiment will be clearly and completely described in conjunction with the accompanying drawings in this embodiment. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1 to 7 shown, this embodiment discloses a bending process for a fan-shaped plate member, using a stamping device and a bending device to bend the plate member 1 from the Figure 1 state to the Figure 2 state.

[0031] As Figure 1 , Figure 2As shown in the figure, the plate member in this embodiment includes a main body 11, a first bending portion 12, a second bending portion 13, and two third bending portions 14. The main body 11, the first bending portion 12, and the second bending portion 13 are fan-shaped. The first bending portion 12 extends outward from the large-radius arc of the main body 11, and the second bending portion 13 extends outward from the small-radius arc of the main body 11. The two third bending portions 14 are flat plates extending straight outward. The boundary between the main body 11 and the first bending portion 12 is the first bending line 111, and the first bending portion 12 needs to be bent along the first bending line 111. The boundary between the main body 11 and the second bending portion 13 is the second bending line 112, and the second bending portion 13 needs to be bent along the second bending line 112. The width of the third bending portion 14 is smaller than the width of the main body 11. The width of the third bending portion 14 is smaller than the width of the main body 11 by the thickness of two main bodies 11, so that the two third bending portions 14 enter between the bent first bending portion 12 and the second bending portion 13 after being bent, making the edge strength of the bent first bending portion 12 and the second bending portion 13 better.

[0032] The plate member 1 includes an inner surface 101 and an outer surface 102. The first bending portion 12, the second bending portion 13, and the third bending portion 14 are bent toward the inner surface 101. The bent first bending portion 12, the second bending portion 13, and the third bending portion 14 form a side wall along the edge of the main body 11 for one week.

[0033] As Figures 1 to 4 shown in the figure, in order to enable the first bending portion 12 and the second bending portion 13 to be bent, and if the fan-shaped first bending portion 12 and the second bending portion 13 are directly pressed and bent, fractures will occur during the bending process. Therefore, in this embodiment, a first deformation groove 121 and a second deformation groove 131 that can deform are processed in the first bending portion 12 and the second bending portion 13. The first deformation groove 121 and the second deformation groove 131 are processed by the stamping die 21 of the stamping device 2.

[0034] As Figure 3As shown, the stamping die 21 includes a first upper die 211 and a first lower die 212. The first upper die 211 is provided with a pressing block 2111, and the first lower die 212 is provided with a pressing groove 2121 corresponding to the pressing block 2111. The pressing block 2111 is triangular pyramid-shaped. The pressing block 2111 includes a pressing edge 21111. The pressing edge 21111 is inclined in the vertical direction. One end of the pressing edge 21111 is inclined towards the direction close to the first lower die 212. The pressing edge 21111 is provided with a rounded corner to prevent the edge from being too sharp and causing stamping damage to the plate member 1. The plate member 1 is placed on the upper end surface of the first lower die 212. The first upper die 211 presses downwards to stretch and deform the part to be stamped and deformed. The pressing block 2111 and the pressing groove 2121 press and fit the first bending part 12 and the second bending part 13 to deform, thereby forming a first deformation groove 121 and a second deformation groove 131. The opening sizes of the first deformation groove 121 and the second deformation groove 131 expand towards the direction away from the main body 11. The first deformation groove 121 and the second deformation groove 131 are also triangular pyramid-shaped corresponding to each other and protrude towards the inner surface 101 direction, forming a recess that expands outwards on the outer surface 102. The thicknesses of the first deformation groove 121 and the second deformation groove 131 are reduced. When the first bending part 12 is bent, for the first deformation groove 121, since the planar fan-shaped first bending part 12 is bent into an arc-shaped side panel, the large-diameter edge of the first bending part 12 will decrease during the bending process. The first deformation groove 121 will deform and shrink the opening of the first deformation groove 121 during the bending process. The first deformation groove 121 with a reduced thickness is more likely to deform. When the second bending part 13 is bent, for the second deformation groove 131, the small-diameter edge of the second bending part 13 gradually expands during the bending process. The second deformation groove 131 will deform and expand the opening of the second deformation groove 131 during the bending process, and the wall thickness of the part of the second deformation groove 131 is thinner, so it is more likely to deform when the second bending part 13 is bent. The settings of the first deformation groove 121 and the second deformation groove 131 make the first bending part 12 and the second bending part 13 bend more smoothly, and there will be no fracture during the bending process.

[0035] As Figure 3 , Figure 4As shown in the figure, when processing the first bending part 12, the fixture assembly 22 used only needs to include a first clamping plate 221, a second clamping plate 222, a telescopic rod 223, a motor 224, and a slide rail 225. The first clamping plate 221 and the second clamping plate 222 clamp the plate member 1. The first clamping plate 221 is provided with a plurality of fixing frames 2211. The fixing frames 2211 are installed with pressing columns 2212. The pressing columns 2212 are installed on the fixing frames 2211 through threads. The fixing frames 2211 extend above the first clamping plate 221. Place the plate member 1 between the first clamping plate 221 and the second clamping plate 222. The edges of the first clamping plate 221 and the second clamping plate 222 are aligned with the first bending line 111. The pressing columns 2212 press the second clamping plate 222 and the first clamping plate 221 together to clamp the plate member 1, preventing the first bending part 12 from deforming the main body 11 during the stamping process, and exposing the first bending part 12 towards the stamping die 21. The first clamping plate 221 is connected to the telescopic rod 223. The telescopic rod 223 is used to adjust the distance between the plate member 1 and the stamping die 21. The telescopic rod 223 is connected to the motor 224 through a mounting seat. The mounting seat has the function of lifting up and down and can lift the plate member 1 after each stamping. The rotation axis of the motor 224 coincides with the center of the circle of the plate member 1. The motor 224 can adjust the angle of the first bending part 12 after each stamping, so that the first deformation groove 121 formed by stamping can be distributed along the arc length of the first bending part 12. The motor 224 is installed on the slide rail 225. The motor 224 can be close to or away from the stamping die 21. According to the radius of different first bending parts 12, the distance between the motor 224 and the stamping die 21 is adjusted so that the first bending part 12 can be better adapted to the stamping die 21.

[0036] When processing the second bending part 13, the above-mentioned fixture assembly 22 for processing the first bending part 12 cannot be used, but the first clamping plate 221 and the second clamping plate 222 are also required to clamp and fix the plate member 1. Similarly, the first clamping plate 221 and the second clamping plate 222 also need to be aligned with the second bending line 112 to prevent the second bending part 13 from deforming the main body 11 during the stamping process.

[0037] As Figures 5 to 7 shown in the figure, the second upper die 31 includes an upper die body 311 and a pressing plate 312. The upper die body 311 includes a bending groove 3111. The bending groove 3111 opens towards the direction of the second lower die 32. The pressing plate 312 is slidably connected to the upper die body 311. The pressing plate 312 is located within the projection range of the bending groove 3111. The pressing plate 312 can press the two arc-shaped edges of the main body 11. When the second upper die 31 presses down to bend the first bending part 12 and the second bending part 13, the pressing plate 312 presses the upper end surface of the main body 11, so that the main body 11 will not deform when the first bending part 12 and the second bending part 13 are bent.

[0038] More preferably, a guiding channel 3114 is formed in the upper die body 311, a guiding plate 3121 is provided on the pressing plate 312, the guiding plate 3121 passes through the guiding channel 3114, a limiting plate 3122 is provided at one end of the guiding plate 3121 away from the pressing plate 312, and a plurality of springs 313 are installed between the pressing plate 312 and the upper die body 311. The plurality of springs 313 are arranged along the length direction of the pressing plate 312 and are distributed on both sides of the guiding plate 3121. In the initial state of the second upper die 31, the lower end surface of the pressing plate 312 is flush with or lower than the lower end surface of the upper die body 311, so that before the upper die body 311 contacts the first bending portion 12 and the second bending portion 13, the pressing plate 312 can first press the main body 11. In the pressing state of the second upper die 31, the pressing plate 312 is located in the bending groove 3111, and the lower end surface of the pressing plate 312 is higher than the first arc surface 31121 and the second arc surface 31131.

[0039] The plate member 1 is placed on the upper end surface of the second lower die 32, the outer surface 102 of the plate member 1 faces upward, the first deformation groove 121 and the second deformation groove 131 protrude downward, and two side walls of the bending groove 3111 form a first pressing surface 3112 and a second pressing surface 3113. The first pressing surface 3112 presses the first bending portion 12. The first pressing surface 3112 includes a first arc surface 31121 and a first straight surface 31122, and the first straight surface 31122 is located at the upper end of the first arc surface 31121. During the downward pressing process of the second upper die 31, the lower end of the first arc surface 31121 of the first pressing surface 3112 will contact the outer end of the first bending portion 12 and press it downward to bend. During the downward pressing process, the contact position between the first pressing surface 3112 and the first bending portion 12 gradually moves along the first arc surface 31121 towards the first straight surface 31122. Finally, the first bending portion 12 is pressed and folded by the first straight surface 31122. Similarly, the second pressing surface 3113 presses the second bending portion 13. The second pressing surface 3113 includes a second arc surface 31131 and a second straight surface 31132, and the second straight surface 31132 is located at the upper end of the second arc surface 31131. The second pressing surface 3113 also presses and folds the second bending portion 13. The first pressing surface 3112 and the second pressing surface 3113 can gradually press and fold from the outside to the inside of the first bending portion 12 and the second bending portion 13, so that the pressing and folding process can be transitioned to prevent the first deformation groove 121 and the second deformation groove 131 from being instantaneously deformed and fractured due to excessive instantaneous pressure.

[0040] The lower ends of the two side surfaces of the second lower die 32 are inclined and close to each other. The upper end surface of the second lower die 32 is the part with the largest width of the second lower die 32. The side walls of the second lower die 32 that contract inward can avoid the first deformation groove 121 and the second deformation groove 131 after bending, preventing interference. When the first bending part 12 and the second bending part 13 are bent, the plate member 1 can be drawn out from the side surface of the second lower die 32 along the circumferential direction of the second lower die 32.

[0041] In this embodiment, the bending process of the plate member 1 using the stamping device 2 and the bending device 3 is as follows:

[0042] S1. Cut out the plate member 1 from the whole aluminum alloy plate. The plate member 1 includes a main body 11, a first bending part 12, a second bending part 13, and two third bending parts 14. The main body 11 is fan-shaped. The first bending part 12 is located at the large-diameter arc of the main body 11. The second bending part 13 is located at the small-diameter arc of the main body 11. The two third bending parts 14 are respectively located at both ends of the main body 11.

[0043] S2. Process the plate member 1 through the stamping device 2. The plate member 1 is fixed to the fixture assembly 22 of the stamping device 2. The stamping die 21 of the stamping device 2 stamps the first bending part 12 and the second bending part 13. A plurality of first deformation grooves 121 are stamped at the first bending part 12. The plurality of first deformation grooves 121 are arranged along the length direction of the first bending part 12. A plurality of second deformation grooves 131 are stamped at the second bending part 13. The plurality of second deformation grooves 131 are arranged along the length direction of the second bending part 13.

[0044] S3. Place the stamped plate member 1 in the bending device 3 for bending. The second upper die 31 and the second lower die 32 of the bending device 3 are close to each other and pressed. Place the main body 11 on the upper end surface of the second lower die 32. The second upper die 31 presses down to bend the first bending part 12 and the second bending part 13. The first deformation grooves 121 gradually close when the first bending part 12 is bent. The second deformation grooves 131 gradually expand when the second bending part 13 is bent.

[0045] S4. Bend the two third bending parts 14. The third bending parts 14 are bent in the bending direction of the first bending part 12 and the second bending part 13. The plate member 1 includes an inner surface 101 and an outer surface 102. The first bending part 12, the second bending part 13, and the third bending part 14 are bent towards the inner surface 101 direction.

[0046] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A bending process for a sector-shaped plate member, characterized in that, It includes the following steps: S1. Cut out the plate member (1). The plate member (1) includes a main body (11), a first bending portion (12), a second bending portion (13) and two third bending portions (14). The main body (11) is fan-shaped. The first bending portion (12) is located at the large-diameter arc of the main body (11). The second bending portion (13) is located at the small-diameter arc of the main body (11). The two third bending portions (14) are respectively located at both ends of the main body (11). S2. Process the plate member (1) through a stamping device (2). The plate member (1) is fixed to the fixture assembly (22) of the stamping device (2). The stamping die (21) of the stamping device (2) stamps the first bending portion (12) and the second bending portion (13). A plurality of first deformation grooves (121) are stamped at the first bending portion (12). The plurality of first deformation grooves (121) are arranged along the length direction of the first bending portion (12). A plurality of second deformation grooves (131) are stamped at the second bending portion (13). The plurality of second deformation grooves (131) are arranged along the length direction of the second bending portion (13). S3. Place the stamped plate member (1) in a bending device (3) for bending. The second upper die (31) and the second lower die (32) of the bending device (3) approach and press together. Place the main body (11) on the upper end surface of the second lower die (32). The second upper die (31) presses down to bend the first bending portion (12) and the second bending portion (13). The first deformation grooves (121) gradually converge when the first bending portion (12) is bent. The second deformation grooves (131) gradually expand when the second bending portion (13) is bent. S4. Bend the two third bending portions (14). The third bending portions (14) are bent in the bending direction of the first bending portion (12) and the second bending portion (13).

2. The bending process of a fan-shaped plate according to claim 1, wherein The plate member (1) includes an inner surface (101) and an outer surface (102). The first bending portion (12), the second bending portion (13) and the third bending portion (14) are bent towards the inner surface (101).

3. The bending process of a fan-shaped plate according to claim 1, characterized in that, The stamping die (21) includes a first upper die (211) and a first lower die (212). The first upper die (211) is provided with a pressing block (2111). The first lower die (212) is provided with a pressing groove (2121) corresponding to the pressing block (2111). The pressing block (2111) is triangular pyramid-shaped. The pressing block (2111) and the pressing groove (2121) press the first bending portion (12) or the second bending portion (13) to deform, thereby forming the first deformation groove (121) or the second deformation groove (131).

4. The bending process of a fan-shaped plate according to claim 3, characterized in that, The pressing block (2111) includes a pressing edge (21111). The pressing edge (21111) is inclined in the vertical direction. One end of the pressing edge (21111) is inclined towards the direction close to the first lower die (212). The opening size of the first deformation groove (121) or the second deformation groove (131) expands towards the direction away from the main body (11).

5. The bending process of a fan-shaped plate according to claim 1, characterized in that, The fixture assembly (22) includes a first clamping plate (221) and a second clamping plate (222). The first clamping plate (221) and the second clamping plate (222) clamp the plate member (1). The boundary between the main body (11) and the first bending portion (12) is the first bending line (111), and the boundary between the main body (11) and the second bending portion (13) is the second bending line (112). The edges of the first clamping plate (221) and the second clamping plate (222) are aligned with the first bending line (111) or the second bending line (112).

6. The bending process of a fan-shaped plate according to claim 5, characterized in that The fixture assembly (22) during stamping the first bending portion (12) in step S2 includes a telescopic rod (223), a motor (224), and a slide rail (225). The first clamping plate (221) is provided with a fixing frame (2211). The fixing frame (2211) mounts a pressing column (2212). The pressing column (2212) presses the second clamping plate (222) and the first clamping plate (221) together. The first clamping plate (221) is connected to the telescopic rod (223). The telescopic rod (223) is connected to the motor (224). The rotation axis of the motor (224) coincides with the center of the plate member (1). The motor (224) is mounted on the slide rail (225), and the motor (224) can approach or move away from the stamping die (21).

7. The bending process of a sector plate according to claim 1, characterized in that, The second upper die (31) includes an upper die body (311) and a pressing plate (312). The pressing plate (312) is slidably connected to the upper die body (311). When the second upper die (31) presses down to bend the first bending portion (12) and the second bending portion (13), the pressing plate (312) presses against the upper end surface of the main body (11).

8. The bending process of a sector plate according to claim 7, characterized in that, The upper die body (311) is provided with a guiding through groove (3114). The pressing plate (312) is provided with a guiding plate (3121). The guiding plate (3121) passes through the guiding through groove (3114). One end of the guiding plate (3121) away from the pressing plate (312) is provided with a limiting plate (3122). A plurality of springs (313) are installed between the pressing plate (312) and the upper die body (311). The plurality of springs (313) are arranged along the length direction of the pressing plate (312), and the springs (313) are distributed on both sides of the guiding plate (3121).

9. The bending process of a fan-shaped plate according to claim 7, characterized in that, The upper die body (311) includes a bending groove (3111). The bending groove (3111) opens towards the direction of the second lower die (32). The two side walls of the bending groove (3111) form a first pressing and folding surface (3112) and a second pressing and folding surface (3113). The first pressing and folding surface (3112) presses and folds the first bending portion (12), and the second pressing and folding surface (3113) presses and folds the second bending portion (13). The lower ends of the two side surfaces of the second lower die (32) are inclined and approach each other.

10. The bending process of a fan-shaped plate according to claim 9, characterized in that The first folding surface (3112) includes a first arc surface (31121) and a first straight surface (31122), the first straight surface (31122) is located at the upper end of the first arc surface (31121), the second folding surface (3113) includes a second arc surface (31131) and a second straight surface (31132), and the second straight surface (31132) is located at the upper end of the second arc surface (31131).

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