Flexible bending center rotating hinge knife

Abstract

The utility model discloses a flexible bending center rotating hinge knife, and belongs to the technical field of flexible bending centers. Comprising a pressing cutter female cutter and a pressing cutter side cutter, and one side of the pressing cutter female cutter is provided with a stepped surface and a curved groove; a cover plate is mounted on the stepped surface; a linear part and a bent part are arranged in the curved groove, and the bent part is arranged towards the middle of the pressing die; a fixing hole is formed in the cutter pressing side cutter, a first pin shaft is installed in the fixing hole, and the first pin shaft penetrates through the fixing hole and slides in the curve groove. A connecting plate and a bearing spring are installed on the upper portion of the cutter pressing side cutter, a second pin shaft is installed at the bottom of the connecting plate, and the connecting plate is connected with the cutter pressing side cutter through the second pin shaft. A connecting pin shaft is installed on the top of the connecting plate and connected with the bottom end of the bearing spring. The utility model solves the technical problem that the blanking interference is caused by the flange of the material pressing die due to the bending caused by the flange when the blanking is carried out after the flanging is generated by the bending of the workpiece.

Description

Technical Field

[0001] The utility model belongs to the technical field of flexible bending centers and relates to a rotary hinge knife of a flexible bending center. Background Art

[0002] In industrial processing, the bending operation of flexible materials often occurs. However, the bending degree and precision of traditional bending machines for flexible materials cannot meet the manufacturing requirements, and the bent parts often return to their original shapes. If manual methods are used for bending, the deformation recovery of the bent parts can be prevented, but it is difficult to ensure the precision and bending angle. Therefore, for the bending process of flexible materials, it is a very important innovation for bending equipment to solve this problem.

[0003] Flexible bending center: It can bend complex shapes such as right angles, non-right angles, arcs, upward and downward folds, etc. With one positioning, multi-sided bending can be completed, and it is applied to the metal forming field of different workpieces in different industries. Currently, flexible bending centers are gradually replacing numerical control bending machines.

[0004] In existing flexible bending centers, a blank holding die is installed to press the workpiece, and a flanging die is used to flange the workpiece; there is a flanging situation for the workpiece, and there is interference with the tool during blanking, making blanking inconvenient and there is a problem of blocking the material. For example, in a flexible bending center described in CN201710111221.X, multiple groups of blank holding blocks are arranged in parallel in the blank holding die.

[0005] In the existing hinge knives, such as the flexible bending center slide rail type pneumatic hinge knife in CN202210900263.2, the rotation effect of the hinge knife is achieved, but the actual problem solved is the service life problem, and there is an inner groove at the tip, which cannot achieve the effect of the hinge knife moving to make way.

[0006] Therefore, a new rotary hinge knife for a flexible bending center needs to be proposed to solve this problem. Summary of the Utility Model

[0007] The problem solved by the utility model is that when the workpiece is bent and flanged, during workpiece blanking, due to the bending caused by the flanging, it is blocked by the edge of the blank holding die, resulting in interference in workpiece blanking and causing an error report and shutdown of the flexible bending center. Further, it is to overcome the technical problem of the pressing knife rotating.

[0008] To solve the above technical problems, the inventor of the utility model obtained the technical solution of the utility model through practice and summary. The basic concept of the technical solution adopted by the utility model to solve the above technical problems is:

[0009] A blanking die is installed in the flexible bending center, and hinge knives are installed at both ends. The bending part is arranged towards the middle of the blanking die.

[0010] The flexible bending center rotating hinge knife includes a blanking mother knife and a blanking side knife. A stepped surface is arranged on one side of the blanking mother knife, and a curve groove is opened on the stepped surface; a cover plate is detachably installed on the stepped surface; the blanking side knife is installed between the cover plate and the blanking mother knife;

[0011] The curve groove includes a straight part and a bending part;

[0012] A fixing hole is opened in the blanking side knife, and a pin shaft I is installed in the fixing hole. The pin shaft I penetrates the fixing hole and is slidably connected in the curve groove; an inclined surface is arranged at the bottom of the blanking side knife outside the blanking mother knife, and the inclined surface rotates downward;

[0013] The upper part of the blanking side knife is connected with a connecting plate, and a bearing spring is installed on the connecting plate;

[0014] A pin shaft II is installed at the bottom of the connecting plate and is connected with the blanking side knife through the pin shaft II;

[0015] A connecting pin shaft is installed at the top of the connecting plate, and the connecting pin shaft is connected with the bottom end of the bearing spring; an installation groove I is opened in the blanking mother knife, and an upper bolt is installed. The top of the bearing spring is connected with the upper bolt.

[0016] In a further technical solution, the installation groove I is located on the blanking mother knife at the top of the stepped surface. The installation groove I is U-shaped and communicates with the stepped surface;

[0017] A connecting hole I is opened in the installation groove I, and the upper bolt is threadedly installed in the connecting hole I; the top of the bearing spring is connected to the upper bolt.

[0018] In a further technical solution, an installation groove II is opened on the stepped surface. The installation groove II is U-shaped; the installation groove II is located at the bottom of the installation groove I;

[0019] The connecting plate is installed in the installation groove II and moves vertically along the installation groove II; both the installation groove I and the installation groove II are opened vertically downward.

[0020] In a further technical solution, an upper pin hole and a lower pin hole are opened on the connecting plate. The upper pin hole is a stepped hole; a limiting cylinder and a retaining ring II are installed on the connecting pin shaft. The limiting cylinder is fixedly installed at one end of the connecting pin shaft close to the blanking mother knife; a baffle is installed at one end of the limiting cylinder away from the connecting pin shaft;

[0021] A positioning ring groove is opened on the limiting cylinder, and the retaining ring II is installed in the positioning ring groove; the limiting cylinder penetrates the upper pin hole and is limited in the upper pin hole through the baffle and the retaining ring II;

[0022] The outer diameter of the limiting cylinder is matched with the inner diameter of the upper pin hole.

[0023] In a further technical solution, the lower pin hole is located at the bottom of the upper pin hole, and the second pin shaft passes through and is connected to the side knife of the press knife;

[0024] The diameter of the upper pin hole is greater than the diameter of the lower pin hole, and the horizontal length of the top of the connecting plate is matched with the horizontal spacing of the second mounting groove.

[0025] In a further technical solution, the cover plate is provided with a first positioning hole and a waist-shaped hole, and the side of the knife pressing mother knife opposite to the cover plate is provided with a second positioning hole, the first positioning hole and the second positioning hole are adapted to each other, and a fixing screw is installed and connected between the first positioning hole and the second positioning hole;

[0026] The end of the connecting pin shaft away from the knife pressing mother knife passes through the waist-shaped hole and extends to the outer end of the cover plate.

[0027] In a further technical solution, a closing portion is provided on the top of the cover plate, and the closing portion is suitable for closing the first installation groove.

[0028] In a further technical solution, the knife-pressing side knife includes a bottom knife portion and a column portion, and the inclined surface is located on the upper side of the bottom knife portion;

[0029] The column part is provided with a position hole, a weight-reducing hole and a fixing hole from top to bottom; the position hole is connected to the second pin;

[0030] The fixing holes, weight-reducing holes and position holes are distributed in a triangular shape;

[0031] The top of the column part is provided with an arc-shaped notch, the position hole is installed in the arc-shaped notch, and the arc-shaped notch is connected to the bottom of the connecting plate.

[0032] In a further technical solution, a retaining ring 1 is installed on both the pin shaft 1 and the pin shaft 2, and the retaining ring 1 is located between the side knife of the pressing knife and the curved groove.

[0033] Beneficial Effects

[0034] The utility model has the following advantages:

[0035] (1) The utility model can keep the side knives of the pressing knife horizontal on both sides of the pressing die when the workpiece is not being fed, so as to realize the flanging bending of the workpiece and facilitate the bending of the flanging workpiece; when the workpiece is being fed, the pull rod pusher pushes the pull rod downward to realize the side knives of the pressing knife sliding and rotating along the curved groove along with the pin shaft 1 and the pin shaft 2. The utility model has a clear structure and can quickly realize the giving way action of the workpiece feeding in the flexible bending center, without the need for the overall contraction of the entire pressing die to achieve the separation from the interference with the edge of the workpiece after flanging.

[0036] (2) The utility model utilizes the straight part and the bent part in the curved part to realize the lowering and rotating actions of the pressing knife side knife driven by the connecting pin shaft. Moreover, the length of the curved part is short, which can produce a more convenient and rapid lowering and rotating effect, thereby effectively reducing the interference with the workpiece blanking.

[0037] (3) The utility model is equipped with a bearing spring, which is clamped up and down on the upper bolt and the connecting pin shaft, so as to realize that when the pull rod is reset, the connecting pin shaft can be quickly reset under the action of the elastic restoring force of the bearing spring. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 Schematic diagram of the hinge knife structure of the present utility model;

[0040] Figure 2 Schematic diagram of the hinge knife of the present utility model installed at the flexible bending center;

[0041] Figure 3 Structure diagram of the pressing knife master knife of the present utility model;

[0042] Figure 4 Front view schematic diagram of the hinge knife structure of the present utility model;

[0043] Figure 5 For Figure 4 A - A sectional view;

[0044] Figure 6 Schematic diagram of the pressing knife side knife in Embodiment 1 of the present utility model;

[0045] Figure 7 Exploded view of the hinge knife of the present utility model;

[0046] Figure 8 For Figure 7 Enlarged view at B;

[0047] Figure 9 Structure diagram of the connecting plate of the present utility model;

[0048] Figure 10 Structure diagram of the cover plate of the present utility model;

[0049] Figure 11 Structure diagram of the pressing knife side knife in Embodiment 2 of the present utility model;

[0050] Figure 12 Internal schematic diagram of the hinge knife of the present utility model Figure One ;

[0051] Figure 13 Internal schematic diagram of the hinge knife of the present utility model Figure Two ;

[0052] In the figure: 1, press knife mother knife; 2, press knife side knife; 3, stepped surface; 4, cover plate; 5, straight part; 6, bent part; 7, fixing hole; 8, pin shaft one; 9, connecting plate; 10, bearing spring; 11, pin shaft two; 12, connecting pin shaft; 13, installation groove one; 14, upper bolt; 15, installation groove two; 16, upper pin hole; 17, lower pin hole; 18, limiting cylinder; 19, baffle; 20, retaining ring two; 21, positioning ring groove; 22, positioning hole one; 23, waist-shaped hole; 24, positioning hole two; 25, fixing screw; 26, closed part; 27, bottom knife part; 28, column part; 29, position hole; 30, weight reduction hole; 31, arc notch; 32, inclined surface; 33, retaining ring one. Specific embodiments

[0053] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further describes the present utility model in detail with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0054] The following further describes the application principle of the present utility model with reference to the accompanying drawings and specific embodiments.

[0055] Embodiment 1

[0056] As Figures 1-6 shown, a flexible bending center rotating hinge knife of the present utility model, including a press knife mother knife 1 and a press knife side knife 2, a stepped surface 3 is provided on one side of the press knife mother knife 1, and a curve groove is opened on the stepped surface 3; a cover plate 4 is detachably installed on the stepped surface 3; a press knife side knife 2 is installed between the cover plate 4 and the press knife mother knife 1; the curve groove includes a straight part 5 and a bent part 6;

[0057] As Figure 5 and Figure 6 shown, a fixing hole 7 is opened in the press knife side knife 2, a pin shaft one 8 is installed in the fixing hole 7, and the pin shaft one 8 is adapted to penetrate the fixing hole 7 and slide along the curve groove to drive the movement and rotation of the press knife side knife 2; As Figure 5As shown in the figure, an inclined surface 32 is provided at the bottom of the pressing knife side knife 2 outside the pressing knife mother knife 1, and the inclined surface 32 rotates downward; the inclined surface is the side surface of the pressing knife side knife, and the position of the inclined surface 32 is defined to describe the rotation direction of the pressing knife side knife. Since it is used in the flexible bending center, the two groups of pressing knife side knives are installed on both sides of the pressing die. When in use, only the pressing knife side knife needs to be bent towards the middle of the pressing die, so as to make way for the flanging position of the workpiece edge line and realize the blanking of the workpiece. As Figure 2 shown. An elastic connecting piece is installed at the top of the pressing knife side knife 2, and a connecting pin shaft 12 is installed on the elastic connecting piece. The connecting pin shaft 12 extends to the outside of the cover plate 4, and the connecting pin shaft 12 is adapted to drive the pressing knife side knife 2 to move along the curve groove. In this embodiment, the elastic connecting piece can be one or a combination of materials such as a spring, a telescopic rod, and a rubber band, and has an elastic telescopic function.

[0058] Embodiment 2

[0059] As Figures 7-13 shown, this is another implementation scheme of the present utility model. On the basis of Embodiment 1, an elastic connecting piece is provided, which includes a connecting plate 9 and a bearing spring 10. The upper part of the pressing knife side knife 2 is connected with the connecting plate 9, and the bearing spring 10 is installed on the connecting plate 9. As Figure 7 shown. A pin shaft two 11 is installed at the bottom of the connecting plate 9 and is connected to the pressing knife side knife 2 through the pin shaft two 11; as Figure 12 shown, a connecting pin shaft 12 is installed at the top of the connecting plate 9, and the connecting pin shaft 12 is connected to the bottom end of the bearing spring 10; an installation groove one 13 is opened on the pressing knife mother knife 1, and an upper position bolt 14 is installed, and the top of the bearing spring 10 is connected to the upper position bolt 14.

[0060] The installation groove one 13 is located on the pressing knife mother knife 1 at the top of the stepped surface 3. The installation groove one 13 is U-shaped and communicates with the stepped surface 3; a connecting hole one is opened in the installation groove one 13, and the upper position bolt 14 is threadedly installed in the connecting hole one; the top of the bearing spring 10 is connected to the upper position bolt 14. An installation groove two 15 is opened on the stepped surface 3. The installation groove two 15 is U-shaped; the installation groove two 15 is located at the bottom of the installation groove one 13; the connecting plate 9 is installed in the installation groove two 15 and moves vertically along the installation groove two 15; both the installation groove one 13 and the installation groove two 15 are opened vertically downward.

[0061] As Figure 9 shown, the connecting plate 9 is provided with an upper pin hole 16 and a lower pin hole 17. The upper pin hole 16 is a stepped hole; a limiting cylinder 18 and a retaining ring two 20 are installed on the connecting pin shaft 12. As Figure 8As shown, the limit cylinder 18 is fixedly installed at one end of the connecting pin shaft 12 close to the pressing tool mother tool 1; a baffle 19 is installed at the end of the limit cylinder 18 away from the connecting pin shaft 12; a positioning ring groove 21 is formed on the limit cylinder 18, and the second retaining ring 20 is installed in the positioning ring groove 21; the limit cylinder 18 penetrates through the upper pin hole 16 and is restricted in the upper pin hole 16 by the baffle 19 and the second retaining ring 20; the outer diameter of the limit cylinder 18 is adapted to the inner diameter of the upper pin hole 16.

[0062] The lower pin hole 17 is located at the bottom of the upper pin hole 16, and the second pin shaft 11 penetrates through and is connected to the pressing tool side tool 2; the diameter of the upper pin hole 16 is larger than the diameter of the lower pin hole 17, and the horizontal length of the top of the connecting plate 9 is adapted to the horizontal spacing of the second installation groove 15.

[0063] As Figure 10 shown, a first positioning hole 22 and an oblong hole 23 are formed on the cover plate 4, and a second positioning hole 24 is formed on one side of the pressing tool mother tool 1 opposite to the cover plate 4. The first positioning hole 22 and the second positioning hole 24 are adapted to each other, and a fixing screw 25 is installed and connected between the first positioning hole 22 and the second positioning hole 24; the end of the connecting pin shaft 12 away from the pressing tool mother tool 1 penetrates through the oblong hole 23 and extends to the outer end of the cover plate 4. A closing part 26 is arranged on the top of the cover plate 4, and the closing part 26 is adapted to close the first installation groove 13.

[0064] Furthermore, as Figure 11 shown, the pressing tool side tool 2 includes a bottom tool part 27 and a column part 28, and an inclined surface 32 is located on the upper side of the bottom tool part 27; a position hole 29, a weight reduction hole 30 and a fixing hole 7 are formed in the column part 28 from top to bottom; the position hole 29 is connected to the second pin shaft 11; the fixing hole 7, the weight reduction hole 30 and the position hole 29 are distributed in a triangle; an arc-shaped notch 31 is arranged at the top of the column part 28, the position hole 29 is installed in the arc-shaped notch 31, and the arc-shaped notch 31 is connected to the bottom of the connecting plate 9. In a further technical solution, a first retaining ring 33 is installed on both the first pin shaft 8 and the second pin shaft 11, and the first retaining ring 33 is located between the pressing tool side tool 2 and the curve groove.

[0065] Installation method: A plurality of sets of blanking molds are installed on the workbench at the flexible bending center. The middle part of the blanking mold includes a plurality of sets of pressing tools, and the flexible bending center rotary hinge knives of this embodiment are symmetrically installed on both sides respectively; the bottom end of the pressing tool side tool 2 at the initial position is horizontal. As Figure 2 and Figure 5 shown, the working state of the pressing tool side tool 2 is that the bottom end rotates towards the middle part of the blanking mold;

[0066] An installation opening is formed on the top of the pressing tool mother tool 1, and the installation opening is correspondingly installed and combined to form a blanking mold; first, install the connecting pin shaft 12, pass the limit cylinder 18 on the connecting pin shaft 12 through the connecting plate 9 and fix it in the positioning ring groove 21 with the second retaining ring 20 to restrict the limit cylinder 18 on the connecting plate 9;

[0067] Then, install the first pin 8 and the second pin 11 on the knife pressing side knife 2. The end of the first pin 8 is within the curve groove. The second pin 11 passes through the lower pin hole and the position hole 29 and is installed in the curve groove. Moreover, retaining rings 33 are installed on both the first pin 8 and the second pin 11, and the retaining rings 33 are located outside the curve groove.

[0068] Next, install the load-bearing spring 10. Hooks are provided at both the upper and lower ends of the load-bearing spring 10, so that the bottom hook of the load-bearing spring 10 is connected to the connecting pin 12. Install the upper bolt 14 in the first connecting hole in the first installation groove 13. The hook at the upper end of the load-bearing spring 10 is connected to the upper bolt 14, and the inner diameter of the top hook is smaller than the outer diameter of the head of the upper bolt 14.

[0069] Finally, install the cover plate 4 to cover the stepped surface 3 and the first installation groove 13; and install the fixing screw 25 in the first positioning hole 22 to connect and close the cover plate 4 and the knife pressing female knife 1.

[0070] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present utility model.

[0071] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Flexible bending center rotating hinge knife, characterized in that, It includes a pressing tool mother tool (1) and a pressing tool side tool (2). A stepped surface (3) is provided on one side of the pressing tool mother tool (1), and a curved groove is formed in the stepped surface (3); a cover plate (4) is detachably installed on the stepped surface (3); the pressing tool side tool (2) is installed between the cover plate (4) and the pressing tool mother tool (1); The curved groove includes a straight portion (5) and a bent portion (6), and the straight portion (5) is above the bent portion (6); A fixing hole (7) is formed in the pressing tool side tool (2), and a first pin shaft (8) is installed in the fixing hole (7). The first pin shaft (8) penetrates through the fixing hole (7) and is slidably connected in the curved groove; an inclined surface (32) is provided at the bottom of the pressing tool side tool (2) outside the pressing tool mother tool (1), and the inclined surface (32) rotates downward; An elastic connecting member is installed at the top of the pressing tool side tool (2). A connecting pin shaft (12) is installed on the elastic connecting member. The connecting pin shaft (12) extends to the outside of the cover plate (4), and the connecting pin shaft (12) is adapted to drive the pressing tool side tool (2) to move along the curved groove.

2. The flexible bending center rotating hinge knife according to claim 1, wherein The elastic connecting member includes a connecting plate (9) and a bearing spring (10). The upper part of the pressing tool side tool (2) is connected with the connecting plate (9), and the bearing spring (10) is installed on the connecting plate (9); A second pin shaft (11) is installed at the bottom of the connecting plate (9) and is connected to the pressing tool side tool (2) through the second pin shaft (11); A connecting pin shaft (12) is installed at the top of the connecting plate (9), and the connecting pin shaft (12) is connected to the bottom end of the bearing spring (10); an installation groove one (13) is formed in the pressing tool mother tool (1), and an upper bolt (14) is installed. The top of the bearing spring (10) is connected to the upper bolt (14).

3. The flexible bending center rotating hinge cutter according to claim 2, wherein The installation groove one (13) is located on the pressing tool mother tool (1) at the top of the stepped surface (3). The installation groove one (13) is U-shaped and communicates with the stepped surface (3); A connecting hole one is formed in the installation groove one (13), and the upper bolt (14) is threadedly installed in the connecting hole one; the top of the bearing spring (10) is connected to the upper bolt (14).

4. The flexible bending center rotating hinge cutter according to claim 3, characterized in that, An installation groove two (15) is formed in the stepped surface (3), and the installation groove two (15) is U-shaped; the installation groove two (15) is located at the bottom of the installation groove one (13); The connecting plate (9) is installed in the installation groove two (15) and moves vertically along the installation groove two (15); both the installation groove one (13) and the installation groove two (15) are open vertically downward.

5. The flexible bending center rotating hinge knife according to claim 4, wherein, Upper pin holes (16) and lower pin holes (17) are formed in the connecting plate (9), and the upper pin holes (16) are stepped holes; a limiting cylinder (18) and a second retaining ring (20) are installed on the connecting pin shaft (12). The limiting cylinder (18) is fixedly installed at one end of the connecting pin shaft (12) close to the pressing tool mother tool (1); a baffle plate (19) is installed at one end of the limiting cylinder (18) away from the connecting pin shaft (12); A positioning ring groove (21) is formed on the limiting cylinder (18), and the second retaining ring (20) is installed in the positioning ring groove (21); the limiting cylinder (18) penetrates through the upper pin hole (16) and is restricted in the upper pin hole (16) by the baffle plate (19) and the second retaining ring (20); The outer diameter of the limiting cylinder (18) is adapted to the inner diameter of the upper pin hole (16).

6. The flexible bending center rotating hinge cutter according to claim 5, wherein, The lower pin hole (17) is located at the bottom of the upper pin hole (16), and the second pin shaft (11) penetrates through and is connected to the pressing knife side knife (2); The diameter of the upper pin hole (16) is larger than that of the lower pin hole (17), and the horizontal length of the top of the connecting plate (9) is adapted to the horizontal spacing of the second installation groove (15).

7. The flexible bending center rotating hinge knife according to claim 6, characterized in that, A first positioning hole (22) and an oblong hole (23) are formed on the cover plate (4), a second positioning hole (24) is formed on one side of the pressing knife mother knife (1) opposite to the cover plate (4), the first positioning hole (22) and the second positioning hole (24) are adapted to each other, and a fixing screw (25) is installed and connected between the first positioning hole (22) and the second positioning hole (24); One end of the connecting pin shaft (12) far away from the pressing knife mother knife (1) penetrates through the oblong hole (23) and extends to the outer end of the cover plate (4).

8. The flexible bending center rotating hinge cutter according to claim 7, characterized in that, A closing part (26) is arranged on the top of the cover plate (4), and the closing part (26) is adapted to close the first installation groove (13).

9. The flexible bending center rotating hinge cutter according to claim 8, characterized in that The pressing knife side knife (2) includes a bottom knife part (27) and a column part (28), and the inclined surface (32) is located on the upper side of the bottom knife part (27); A position hole (29), a weight reduction hole (30) and a fixing hole (7) are formed in the column part (28) from top to bottom; the position hole (29) is connected to the second pin shaft (11); The fixing hole (7), the weight reduction hole (30) and the position hole (29) are distributed in a triangle; An arc-shaped notch (31) is arranged at the top of the column part (28), the position hole (29) is installed in the arc-shaped notch (31), and the arc-shaped notch (31) is connected to the bottom of the connecting plate (9).

10. The flexible bending center rotating hinge cutter according to claim 9, characterized in that, A first retaining ring (33) is installed on both the first pin shaft (8) and the second pin shaft (11), and the first retaining ring (33) is located between the pressing knife side knife (2) and the curve groove.

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