R-shaped wrap angle bending mechanism and equipment

Abstract

The invention discloses an R-shaped wrap angle bending mechanism and equipment. The equipment comprises two wrap angle bending mechanisms which are oppositely arranged. The wrap angle bending mechanism comprises a material pressing block, a padding block and a bending mechanism which is arranged on the side face of the material pressing block and can obliquely move along with the material pressing block. The bending mechanism comprises a die head guide piece and a bending die. The die head guide piece is provided with a die head groove and an arc guide clamping groove. The bending die comprises a cylindrical die head block and an arc-shaped guide clamping block. The die head block is movably connected with the cylinder through a handle. The die head block is clamped in a space formed by the die head groove and the side face of the material pressing block through clamping of the guide clamping block and the guide clamping groove. The die head block forms a die head side face through a notch containing the circle center of the arc. When the die head block is driven to rotate, the die head block rotates around the circle center of the arc through clamping and guiding of the guiding clamping block and the guiding clamping groove, the edge face of the die head is driven to conduct bending operation, and therefore conflict between a traditional swing shaft and a plate in space is avoided.

Description

Technical Field

[0001] The invention relates to a plate bending and forming device, in particular to the bending of a plate corner. Background Art

[0002] In the sheet bending process, the most difficult part is the bending of the sheet corners, especially the embedded corners. On the one hand, due to the influence of the sheet body, it is difficult for the conventional bending die to extend into this part for bending operation. On the other hand, the rotating axis of the bending die overlaps with the sheet, and the size of the bending process is small. All these make it difficult to build the bending die. Summary of the invention

[0003] Problem to be solved by the present invention: Mechanical equipment for bending embedded corners of sheet materials.

[0004] To solve the above problems, the solution adopted by the present invention is as follows: According to the present invention, an R-shaped corner bending mechanism comprises a moving frame, a pressure block and an R-shaped bending mechanism arranged on the moving frame, and a gasket block; the moving frame is connected to a moving cylinder, and can move obliquely facing the gasket block under the drive of the moving cylinder, so that the pressure block can be pressed on the gasket block; when the pressure block is pressed on the gasket block, it is pressed on the top surface and the outer side surface of the gasket block at the same time, so that the pressure block can simultaneously press the main body plate and the side panel of the material plate on the top surface and the outer side surface of the gasket block respectively; the R-shaped bending mechanism comprises a die guide and a bending die; the die guide is arranged on the side of the moving direction of the pressure block, and the side of the die guide facing the pressure block is provided with a die groove, so that a space for accommodating the bending die is formed between the die guide and the pressure block; the die The surface of the groove facing the pressing block is a plane, and an arc-shaped guide groove is arranged in the plane; the bending die includes a die head block, a guide block and a power handle; the die head block matches the die head groove and is arranged in the die head groove; the guide block is an arc-shaped structure fixedly connected to the die head block, matches the guide groove, is clamped in the guide groove, and can slide in the circumferential direction along the guide groove; the die head block is connected to the power handle, and is connected to a bending cylinder through the power handle, so that the die head block, under the drive of the bending cylinder and the limitation of the guide block in the guide groove, moves circumferentially around the center of the arc-shaped guide groove; a bending die notch is provided on the die head block; the center of the arc-shaped guide block is located in the bending die notch; the bending die notch includes a straight edge surface as the edge surface of the bending forming die head.

[0005] Further, according to the angle bending mechanism of the present invention, the die block is a cylinder, and the bending die notch is a fan-shaped notch axially opened on the cylindrical die block; the die groove is provided with an arc guide surface matching the cylindrical surface of the die block, so that when the die block makes a circular motion in the die groove, the cylindrical surface of the die block slides along the arc guide surface of the die groove.

[0006] Further, according to the corner bending mechanism of the present invention, the cushion block is arranged on the translation clamping block, the translation clamping block is clamped in the translation clamping slot, can translate along the translation clamping slot, and is connected to a translation cylinder.

[0007] Further, according to the angle bending mechanism of the present invention, the power handle is connected to the piston rod of the bending cylinder through a hinge; the line connecting the hinge axis of the power handle connecting the piston rod of the bending cylinder and the center of the arc-shaped guide block has an angle of not less than 30 degrees and not more than 60 degrees with the edge surface of the die head.

[0008] Further, according to the angle bending mechanism of the present invention, the guide block is an arc-shaped structure with an angle of at least π / 3.

[0009] Further, according to the angle bending mechanism of the present invention, the guide groove is a circular arc groove with an arc of at least 5π / 6.

[0010] Further, according to the angle bending mechanism of the present invention, the die guide comprises a fixed portion and a guide portion; the die groove is a groove body produced by the L-shaped connection between the guide portion and the fixed portion; and the guide slot is an arc-shaped hole body provided on the guide portion.

[0011] Further, according to the corner bending mechanism of the present invention, the guide portion is a plate structure.

[0012] Further, according to the corner bending mechanism of the present invention, the guide portion is provided with an avoidance notch; the center of the arc-shaped guide slot is located in the avoidance notch; the guide portion is provided with an auxiliary support surface through the straight edge surface of the avoidance notch; when the material sheet is pressed against the pad block by the pressing block, the side panel of the material sheet can be supported by the auxiliary support surface.

[0013] According to the present invention, an R-shaped corner bending device includes a frame, two of the above-mentioned corner bending mechanisms arranged on the frame, and a supporting platform and an end edge alignment mechanism arranged on the frame; the two corner bending mechanisms are arranged in a mirror-symmetrical manner; the supporting platform and the end edge alignment mechanism are arranged along the symmetrical center line of the two corner bending mechanisms; the end edge alignment mechanism includes a push plate cylinder and a push plate connected to the push plate cylinder and facing the supporting platform; wherein the push plate is perpendicular to the center line.

[0014] The technical effects of the present invention are as follows: the present invention replaces the traditional bearing and swing shaft method by having an arc-shaped guide block clamped in an arc-shaped guide groove and moving in a circular direction along the arc, thereby avoiding the spatial conflict between the swing shaft itself and the processed plate, making the entire bending mold exquisite and easy to install and implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the R-shaped corner bending mechanism according to an embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of the overall structure of the R-shaped corner bending device according to an embodiment of the present invention.

[0017] Figure 3 It is a working principle diagram between the R-shaped corner bending mechanism and the processed material sheet according to an embodiment of the present invention.

[0018] Figure 4 It is a schematic diagram of the matching structure of the die head guide and the bending die in an embodiment of the present invention.

[0019] Figure 5 It is a schematic structural diagram of a die guide member according to an embodiment of the present invention.

[0020] Figure 6 It is a schematic structural diagram of a bending die according to an embodiment of the present invention.

[0021] Figure 7 It is a structural schematic diagram of an enlarged corner of a processed sheet material in an embodiment of the present invention.

[0022] Figure 8 and Fig. 9 This is a working principle diagram of the cooperation between the die head guide and the bending die.

[0023] Fig.10 It is a schematic diagram of the matching structure of the translation card block and the translation card slot of the present invention.

[0024] In the above figures, 1 is an angle bending mechanism, 101 is a first angle bending mechanism, and 102 is a second angle bending mechanism; 11 is a moving frame, 119 is a guide pin and guide sleeve mechanism, 12 is a moving cylinder, 13 is a pressing block, and 14 is an R-shaped bending mechanism; 141 is a die guide, 1411 is a fixing portion, 14111 is an arc guide surface, 1412 is a guide portion, 14121 is a guide plane, 1413 is a die slot, 1414 is a guide slot, 1415 is an avoidance notch, and 14151 is an auxiliary support surface; 142 is a bending die, 1421 is a die block, 1422 is a guide block, 1423 is a power handle, 14231 is a hinge shaft hole, 1424 is a bending die notch, 14241 is a die side surface, 143 is a bending cylinder, and 149 is a second hinge; 15 is a gasket block, 151 is a translation block, 1511 is a clamping strip, 152 is a translation slot, 1521 is an L-shaped clamping block, and 153 is a translation cylinder; 19 is a bending frame, 191 is a frame bottom plate, 1911 is a bottom plate groove, 192 is a frame plate, and 193 is a frame beam; 2 is a support table; 3 is an end edge alignment mechanism, 31 is a push plate cylinder, 32 is a push plate, and 33 is an end edge alignment block; 8 is a processed material plate, 81 is a main body plate, 82 is a side plate, 83 is an extended corner portion, 84 is a first bending edge, 841 is a protruding portion of the first bending edge, 841A is a state of the protruding portion of the first bending edge before bending, 841B is a state of the protruding portion of the first bending edge after bending, and 85 is a second bending edge; 9 is a rack, and 91 is a rack platform. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings.

[0026] Figure 2 An R-shaped corner bending device is illustrated for bending the corner of a processed sheet. Specifically, see Figure 3 and Figure 7 The example of the processed material plate 8. The material plate 8 includes a main body plate 81 and side panels 82 arranged on both sides of the main body plate 81. The side panels 82 are long strips of plates that are cut and bent to form a 90-degree angle with the main body plate 81. The side panels 82 on both sides are arranged in a mirror-symmetrical manner. The side panels 82 on both sides are connected with corner extensions 83 whose upper ends in the length direction exceed the main body plate 81. The corner extension 83 is connected with a first bending edge 84 and a second bending edge 85 formed by bending. The first bending edge 84 is perpendicular to the side panel 82 and parallel to the main body plate 81; the second bending edge 85 is the end bend of the side panel 82, perpendicular to the side panel 82, and perpendicular to the main body plate 81. The second bending edge 85 is also the end edge of the side panel 82. The first bending edge 84 is provided with a first bending edge protrusion 841 whose length in the length direction is less than the corner extension 83. The corner bending device of this embodiment is used to further bend the first bending edge protrusions 841 on both sides of the sheet 8 inwardly, referring to Fig. 9For example, the first bending edge protrusion 841A perpendicular to the corner extension 83 is further bent into the first bending edge protrusion 841B parallel to the corner extension 83. The first bending edge protrusion 841B is perpendicular to the first bending edge 84, thereby forming a U-shaped structure with the first bending edge 84 and the corner extension 83.

[0027] The corner bending equipment includes two corner bending mechanisms 1, a supporting platform 2 and an end edge alignment mechanism 3. The two corner bending mechanisms 1, the supporting platform 2 and the end edge alignment mechanism 3 are arranged on a frame 9. Specifically, a horizontal frame platform 91 is provided on the top of the frame 9. The two corner bending mechanisms 1, the supporting platform 2 and the end edge alignment mechanism 3 are all arranged on the frame platform 91. The two corner bending mechanisms 1 are respectively a first corner bending mechanism 101 and a second corner bending mechanism 102. The two corner bending mechanisms 1 are arranged mirror-symmetrically about the center line of the frame platform 91. The supporting platform 2 and the end edge alignment mechanism 3 are arranged along the center line of the two corner bending mechanisms 1. Among them, the two corner bending mechanisms 1 are respectively used to bend the first bending edge protrusions 841 on both sides of the processed material plate 8; the supporting platform 2 is used to provide a plate surface support for the main plate 81 of the material plate 8 when bending; and the end edge alignment mechanism 3 is used to align with the end of the material plate 8. The end edge alignment mechanism 3 includes an end edge alignment mechanism of the main plate 81 composed of a push plate cylinder 31 and a push plate 32 connected to the push plate cylinder 31 and facing the support platform 2, and end edge alignment blocks 33 of two side panels 82. The push plate 32 faces the support platform 2, that is, the push plate 32 is perpendicular to the center line of the two corner bending mechanisms 1. During the bending operation, the push plate 32 is pressed against the end edge of the main plate 81, and the end edge alignment block 33 is pressed against the end edge of the side panel 82.

[0028] The corner bending mechanism 1 is the R-shaped corner bending mechanism referred to in the present invention. Figure 1 and Figure 3 , including a moving frame 11 and a cushioning block 15 arranged on a bending frame 19, and a pressing block 13 and an R-shaped bending mechanism 14 arranged on the moving frame 11. The moving frame 11 is connected to a moving cylinder 12, and can move obliquely facing the cushioning block 15 under the drive of the moving cylinder 12, so that the pressing block 13 can be pressed on the cushioning block 15.

[0029] More specifically, in this embodiment, the bending frame 19 includes a frame bottom plate 191 and two vertically arranged frame plates 192 arranged on the frame bottom plate 191. A suspended frame beam 193 is arranged between the two vertically arranged frame plates 192. The movable frame 11 is arranged on the frame beam 193 through two groups of guide column and guide sleeve mechanisms 119. The movable cylinder 12 is arranged on the frame beam 193. The piston rod of the movable cylinder 12 is arranged between the two groups of guide column and guide sleeve mechanisms 119, and is connected to the movable frame 11, so that it can move obliquely under the drive of the movable cylinder 11 and the guidance of the guide column and guide sleeve mechanisms 119. The pad block 15 is arranged on the translation block 151. The translation block 151 is stuck in the translation slot 152 and can translate along the translation slot 152. The translation block 151 is connected to the translation cylinder 153, so that the translation block 151 is translated along the translation slot 152 under the drive of the translation cylinder 153. Fig.10 , a clip strip 1511 protruding laterally outward is provided at the bottom of the translation block 151. The translation slot 152 is constructed by a bottom plate groove 1911 on the frame bottom plate 191 and two L-shaped clip blocks 1521. The bottom of the translation block 151 is provided with the clip strip 1511 in the bottom plate groove 1911, and the two L-shaped clip blocks 1521 are provided on both sides of the bottom plate groove 1911 in an inverted manner, so that the L-shaped clip block 1521 can be stuck on the clip strip 1511, so that the translation block 151 is stuck between the two L-shaped clip blocks 1521, and under the blocking position of the two L-shaped clip blocks 1521, it can be translated in the bottom plate groove 1911 along the length direction. The translation direction of the translation block 151 is perpendicular to the center line of the two corner bending mechanisms 1.

[0030] When the pressing block 13 is pressed on the cushion block 15, it is pressed on the top surface and the outer side surface of the cushion block 15 at the same time, so that the pressing block 13 can simultaneously press the main body plate 81 and the side panel 82 of the material plate 8 on the top surface and the outer side surface of the cushion block 15 respectively. More specifically, the pressing block 13 is configured with two pressing surfaces, and the two pressing surfaces are perpendicular to each other. When pressed on the cushion block 15, one of the pressing surfaces is pressed on the top surface of the cushion block 15, and the other pressing surface is pressed on the outer side surface of the cushion block 15. During the pre-bending pressing operation, after the sheet 8 is placed on the support platform 2, the pad block 15 is driven by the translation cylinder 153 to move outwards under the main plate 81 to press the inner side of the side panel 82; the pressing block 13 is driven by the moving cylinder 12 to move obliquely toward the bending angle of the main plate 81 and the side panel 82 until the pressing block 13 is pressed on the outer side of the side panel 82 and the top surface of the main plate 81. The movement of the pad block 15 and the movement of the pressing block 13 can be performed simultaneously or sequentially.

[0031] R-shaped bending mechanism 14, refer to Figure 4 , Figure 5 , Figure 6 , Figure 8 and Fig. 9, including a die guide 141 and a bending die 142. The assembly structure between the die guide 141 and the bending die 142 is in an R shape. The die guide 141 is arranged on the side of the moving direction of the pressing block 13, and a die groove 1413 is arranged on the side of the die guide 141 facing the pressing block, so that a space for accommodating the bending die 142 is formed between the die guide 141 and the pressing block 13. The surface of the die groove 1413 facing the pressing block 13 is a plane, and an arc-shaped guide groove 1414 is arranged in the plane. The bending die 142 includes a die block 1421, a guide block 1422 and a power handle 1423. The die block 1421 matches the die groove 1413 and is arranged in the die groove 1413. The arc-shaped structure that the guide block 1422 is fixedly connected to the die block 1421 matches the guide slot 1414, is stuck in the guide slot 1414, and can slide in the circumferential direction along the guide slot 1414. The die block 1421 is connected to the power handle 1423, and is connected to the bending cylinder 143 through the power handle 1423, so that the die block 1421, under the drive of the bending cylinder 143 and the limitation of the guide block 1422 in the guide slot 1414, moves circumferentially around the center of the arc-shaped guide slot 1414. The die block 1421 is provided with a bending die notch 1424; the center of the arc-shaped guide block 1422 is located in the bending die notch 1424; the bending die notch 1424 includes a straight edge surface as a bending forming die edge surface 14241.

[0032] In this embodiment, the die guide 141 includes a fixing portion 1411 and a guiding portion 1412. The die groove 1413 is an L-shaped groove body produced by the L-shaped connection between the guiding portion 1412 and the fixing portion 1411. The fixing portion 1411 is provided with a bolt hole. The die guide 141 is fixed to the pressing block 13 by means of bolts provided in the bolt holes of the fixing portion 1411, and is fixed to the side of the moving direction of the pressing block 13. The surface of the die groove 1413 facing the pressing block 13, that is, the inner side surface of the guide portion 1412, is the guide plane 14121. The guide plane 14121 is parallel to the side of the pressing block 13. The die groove 1413 enables the guide plane 14121 and the side of the moving direction of the pressing block 13 to form a space for accommodating the die block 1421 of the bending die 142. The die block 1421 of the bending die 142 is arranged in the space, that is, the die block 1421 is arranged in the die groove 1413. The die block 1421 is a cylindrical structure. The die groove 1413 is provided with an arc guide surface 14111 that matches the cylindrical surface of the die block 1421. The arc guide surface 14111 is a surface formed by the arc groove of the fixing part 1411. When the die block 1421 is arranged in the die groove 1413, the end faces of both ends of the cylindrical die block 1421 are respectively close to the guide plane 14121 and the side of the pressing block 13, and the cylindrical surface is close to the arc guide surface 14111, and the die block 1421 is clamped in the die groove 1413 as a whole through the engagement of the guide clamping block 1422 and the guide clamping groove 1414. When the bending die 142 rotates relative to the die guide 141, the guide block 1422 slides in the guide slot 1414 along the circumferential direction, and the end faces of the cylindrical die block 1421 at both ends slide against the guide plane 14121 and the side of the pressure block 13 respectively, and the cylindrical surface of the die block 1421 slides against the arc guide surface 14111. The bending die notch 1424 is a fan-shaped notch axially opened on the cylindrical die block 1421, that is, the bending die notch 1424 is fan-shaped in the cross section perpendicular to the axial direction of the cylindrical die block 1421. Figure 8 , the center O of the arc-shaped guide block 1422 is located in the bending die notch 1424. The die head side surface 14241 is a straight edge plane formed by a fan-shaped straight edge. A hinge shaft hole 14231 is provided on the power handle 1423. The power handle 1423 is connected to the piston rod of the bending cylinder 143 through a hinge provided on the hinge shaft hole 14231. The bending cylinder 143 is arranged on the mobile frame 11 through a second hinge 149. Therefore, under the drive of the bending cylinder 143, through the engagement of the guide block 1422 and the guide slot 1414, the bending die 142 as a whole swings in a circumferential direction around the common center of the arc-shaped guide block 1422 and the arc-shaped guide slot 1414.

[0033] In order to ensure the engagement of the guide block 1422 and the guide slot 1414, so that the bending die 142 can rotate under the drive of the bending cylinder 143, the guide block 1422 has an arc-shaped structure of at least π / 3 radians, that is, the angle A1 between the two ends of the arc of the guide block 1422 relative to the center O is not less than 60 degrees. In this embodiment, the angle A1 is 110 degrees, that is, the guide block 1422 has 11π / 18 radians. On the other hand, to bend the first bending edge protrusion 841 from the state 841A before the first bending edge protrusion is bent to the state 841B after the first bending edge protrusion is bent, the bending die 142 needs to swing at least 90 degrees, that is, the swing stroke angle A2 of the guide block 1422 in the guide slot 1414 is at least 90 degrees, that is, the guide block 1422 needs to swing at least π / 2 radians. In this embodiment, the stroke angle A2 is 100 degrees, that is, 5π / 9 radians. The radian of the arc-shaped guide slot 1414 corresponds to the angle A3 between the two ends of the arc of the guide slot 1414 relative to the center O, which is the sum of the angle A1 between the two ends of the arc of the guide block 1422 relative to the center O and the stroke angle A2 of the swing of the guide block 1422 in the guide slot 1414. Therefore, the guide slot 1414 is at least π / 3+π / 2=5π / 6 radians, that is, the angle A3 is at least 150 degrees. Specifically in this embodiment, the angle A3 is 100+110=210 degrees, that is, the guide slot 1414 is 7π / 6 radians.

[0034] During the bending operation, the die side surface 14241 is a plane that presses the first bending side protrusion 841 and bends the first bending side protrusion 841 from the state 841A before the first bending side protrusion is bent to the state 841B after the first bending side protrusion is bent. That is, during the bending process, the die side surface 14241 needs to at least rotate from a horizontal state to a vertical state. In order to keep the pressure of the die side surface 14241 on the first bending side protrusion 841 relatively stable during bending, in this embodiment, the hinge axis of the piston rod of the bending cylinder 143 connected to the power handle 1423 is the hole center of the hinge axis hole 14231. There is an angle A4 between the line connecting the hole center and the center of the circle O of the arc-shaped guide block 1422 and the die side surface 14241. The angle A4 is generally required to be not less than 30 degrees and not more than 60 degrees. In this embodiment, 40 degrees is preferred.

[0035] In addition, in this embodiment, the first bending edge protrusion 841 of the processed sheet material 8 is at a certain distance from the end of the side panel 82. For this reason, in this embodiment, an auxiliary support surface 14151 is also configured for the side panel 82 in the die head guide 141, so that the auxiliary support surface 14151 can provide support for the first bending edge protrusion 841 and a part of the sheet material at the end of the side panel 82. Specifically, the guide portion 1412 is provided with an avoidance notch 1415. The avoidance notch 1415 is an axial fan-shaped notch, that is, the avoidance notch 1415 is fan-shaped on the cross section perpendicular to the axial direction of the arc-shaped guide slot 1414. The center O of the arc-shaped guide slot 1414 is located in the avoidance notch 1415. The auxiliary support surface 14151 is a plane formed by the fan-shaped straight edge of the avoidance notch 1415. When the material sheet 8 is pressed against the cushion block 15 by the pressing block 13, the end of the side panel 82 of the material sheet 8 can pass through the avoidance gap 1415, and the outer side of a portion of the panel surface from the end of the side panel 82 to the first bending edge protrusion 841 can be supported by the auxiliary support surface 14151.

[0036] In this embodiment, the guide portion 1412 is a plate structure, and its inner side surface is a guide plane 14121. The guide slot 1414 penetrates the guide portion 1412 of the plate structure on both sides, that is, the guide slot 1414 is an arc-shaped hole body provided on the guide portion 1412. Those skilled in the art understand that the inner side surface of the guide portion 1412 is a plane 14121, but the outer side surface is not required to be so, so in other optional embodiments, the guide portion 1412 can be any other shape.

[0037] In addition, it should be pointed out that the moving cylinder 12, the translation cylinder 153, the bending cylinder 143, and the push plate cylinder 31 can be pneumatic cylinders, hydraulic cylinders, or a mixture of the two. In this embodiment, the moving cylinder 12, the translation cylinder 153, the bending cylinder 143, and the push plate cylinder 31 are preferably pneumatic cylinders.

Claims

1. An R-shaped corner bending mechanism, characterized in that: The invention comprises a movable frame, a pressure block and an R-shaped bending mechanism arranged on the movable frame, and a gasket block; the movable frame is connected to a movable cylinder, and can move obliquely facing the gasket block under the drive of the movable cylinder, so that the pressure block can be pressed on the gasket block; when the pressure block is pressed on the gasket block, it is pressed on the top surface and the outer side surface of the gasket block at the same time, so that the pressure block can simultaneously press the main body plate and the side panel of the material plate on the top surface and the outer side surface of the gasket block respectively; the R-shaped bending mechanism comprises a die guide and a bending die; the die guide is arranged on the side of the moving direction of the pressure block, and the side of the die guide facing the pressure block is provided with a die groove, so that a space for accommodating the bending die is formed between the die guide and the pressure block; the die groove faces the pressure block The surface is a plane, and an arc-shaped guide groove is arranged in the plane; the bending die includes a die block, a guide block and a power handle; the die block matches the die groove and is arranged in the die groove; the guide block is an arc-shaped structure fixedly connected to the die block, matches the guide groove, is clamped in the guide groove, and can slide in the circumferential direction along the guide groove; the die block is connected to the power handle, and is connected to a bending cylinder through the power handle, so that the die block, under the drive of the bending cylinder and the limitation of the guide block in the guide groove, makes circumferential movement around the center of the arc-shaped guide groove; a bending die notch is provided on the die block; the center of the arc-shaped guide block is located in the bending die notch; the bending die notch includes a straight edge surface as the edge surface of the bending forming die.

2. The angle bending mechanism according to claim 1, characterized in that: The die block is a cylinder, and the bending die notch is a fan-shaped notch axially opened on the cylindrical die block; the die groove is provided with an arc guide surface matching the cylindrical surface of the die block, so that when the die block makes a circular motion in the die groove, the cylindrical surface of the die block slides along the arc guide surface of the die groove.

3. The angle bending mechanism according to claim 1, characterized in that: The cushion block is arranged on the translation clamping block, the translation clamping block is clamped in the translation clamping slot, can be translated along the translation clamping slot, and is connected with a translation cylinder.

4. The angle bending mechanism according to claim 1, characterized in that: The power handle is connected to the piston rod of the bending cylinder through a hinge; the angle between the line connecting the hinge axis of the power handle connecting the piston rod of the bending cylinder and the center of the arc-shaped guide block and the edge surface of the die head is not less than 30 degrees and not more than 60 degrees.

5. The angle bending mechanism according to claim 1, characterized in that: The guide block is an arc-shaped structure with an angle of at least π / 3.

6. The angle bending mechanism according to claim 1, characterized in that: The guide slot is a circular arc slot with an angle of at least 5π / 6.

7. The angle bending mechanism according to claim 1, characterized in that: The die guide comprises a fixing part and a guiding part; the die groove is a groove body formed by the L-shaped connection between the guiding part and the fixing part; and the guiding slot is an arc-shaped hole body arranged on the guiding part.

8. The angle bending mechanism according to claim 7, characterized in that: The guide part is a plate structure.

9. The angle bending mechanism according to claim 7, characterized in that: The guide portion is provided with an avoidance gap; the center of the arc-shaped guide slot is located in the avoidance gap; the guide portion is provided with an auxiliary support surface through the straight edge surface of the avoidance gap; when the material plate is pressed against the pad block by the pressing block, the side panel of the material plate can be supported by the auxiliary support surface.

10. An R-shaped corner bending device, characterized in that: The machine comprises a frame, two corner bending mechanisms according to any one of claims 1 to 8 arranged on the frame, a supporting platform and an end edge alignment mechanism arranged on the frame; the two corner bending mechanisms are arranged in mirror symmetry; the supporting platform and the end edge alignment mechanism are arranged along the symmetrical center line of the two corner bending mechanisms; the end edge alignment mechanism comprises a push plate cylinder and a push plate connected to the push plate cylinder and facing the supporting platform; The push plate is perpendicular to the center line.

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