Bending machine die with limiting function

Abstract

The invention relates to the technical field of bending machines, and discloses a bending machine mold with a limiting function, which comprises a bending machine rack, a workbench is fixedly connected to the top of the bending machine rack, a mounting frame is fixedly connected to the top of the workbench, a lifting rod is slidably connected to the top of the mounting frame, and a limiting rod is fixedly connected to the top of the lifting rod. A lifting block is fixedly connected to the bottom end of the lifting rod, a middle mold and two side molds are fixedly connected to the bottom of the lifting block, and an acute-angle straight knife is slidably connected to one side of the bending machine rack; and an L-shaped hole is formed in the bottom of the inner wall of the middle mold, a pulley is slidably connected to the inner wall of the L-shaped hole, and a right-angle connecting rod is fixedly connected to the bottom end of the pulley. The bending machine die can effectively solve the problems that in the prior art, due to the influence of the complex structure of a plate, the bending position of part of the plate is difficult to make contact with the upper die in the bending length direction, the bending angle and size of the position are deviated, and the bending quality of the plate is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bending machine, in particular to a bending machine die with limiting function. BACKGROUND

[0002] The bending machine is a kind of mechanical equipment for bending forming of metal plate, which makes the plate to be plastically deformed according to the preset angle and shape by applying external force, and is widely used in sheet metal processing, mechanical manufacturing, automobile, aerospace, electronics, building decoration and other industries. In the bending process of metal sheet, the sharp straight knife is used to bend the four edges of the sheet by ninety degrees, and the four edges are bent to form a closed or semi-closed cavity structure, which significantly improves the bending and torsional resistance of the sheet.

[0003] In the process of bending the four edges of the rectangular plate, first, the positioning device drives the rectangular plate to move to ensure that the plate is in the correct bending position, then the driving system of the bending machine drives the upper die to move downward, cooperates with the workbench to apply pressure to the rectangular plate, and under the action of the pressure, the plate position is fixed, finally, the sharp straight knife of the bending machine is vertically upwardly moved below the rectangular plate, and under the limiting action of the upper die, the upwardly moving sharp straight knife bends the plate by ninety degrees upwardly.

[0004] At present, in the process of bending the four edges of the rectangular plate, the two opposite edges are usually bent first, and then the other two opposite edges are bent, so as to reduce the stress concentration and deformation risk. However, after the two opposite edges of the rectangular plate are bent twice by ninety degrees upwardly, the two sides of the rectangular plate are in the shape of " " structure. At this time, when the other two opposite edges are bent twice by ninety degrees upwardly, due to the structure of the rectangular plate, in the direction of the bending length, there is a part of the plate that is difficult to contact with the upper die (this part is the overlapping part of the adjacent folds in the background art, that is, the inside of the four corners in the background art), which causes the bending angle and size at this part to deviate, and reduces the bending quality of the plate. Figure 4 Figure 4 In view of the above-mentioned shortcomings of the prior art, the present application provides a bending machine die with limiting function, which can effectively solve the problems in the background art. SUMMARY

[0005] In view of the above-mentioned shortcomings of the prior art, the present application provides a bending machine die with limiting function, which can effectively solve the problems in the background art.

[0006] To achieve the above purpose, the present application is realized by the following technical scheme: The present application provides a bending machine die with limiting function, comprising: ​The bending machine rack is provided with a workbench fixedly connected to the top of the bending machine rack, a mounting frame fixedly connected to the top of the workbench, a lifting rod slidingly connected to the top of the mounting frame, a lifting block fixedly connected to the bottom end of the lifting rod, an intermediate die and two side dies fixedly connected to the bottom of the lifting block respectively, and an acute-angle straight knife slidingly connected to one side of the bending machine rack. An L-shaped hole is formed in the inner wall bottom of the intermediate die, an inner wall of the L-shaped hole is slidingly connected with a pulley, the bottom end of the pulley is fixedly connected with a right-angle connecting rod, and the end of the right-angle connecting rod close to the acute-angle straight knife is fixedly connected with a trapezoidal inclined block.

[0007] Further, a first circular block is rotationally connected to the inner wall bottom of the intermediate die, a first adjusting slide rail is fixedly connected to the top of the first circular block, a rotating straight rail is fixedly connected to the circumferential outer surface of the first circular block, the top end of the pulley is slidingly connected in the interior of the rotating straight rail, a cross rod is slidingly connected in the interior of the first adjusting slide rail, a first hydraulic cylinder is fixedly connected to the inner wall bottom of the lifting block, and the telescopic end of the first hydraulic cylinder is fixedly connected with the cross rod.

[0008] Further, the first adjusting slide rail comprises a first vertical upper section, a first spiral section and a first vertical lower section, the bottom end of the first vertical upper section is fixedly communicated with the top end of the first spiral section, and the bottom end of the first spiral section is fixedly communicated with the top end of the first vertical lower section.

[0009] Further, the circumferential outer surface of the cross rod is fixedly connected with a triangular plate, the bottom of the triangular plate is fixedly connected with a pressing claw, the bottom of the side die is fixedly connected with an elastic element, and the telescopic end of the elastic element is fixedly connected with a push block.

[0010] Further, the elastic element comprises a telescopic cylinder and a telescopic rod, the telescopic cylinder is fixedly connected to the bottom of the side die, the telescopic rod is slidingly connected in the interior of the telescopic cylinder, a return spring is fixedly connected between the telescopic rod and the telescopic cylinder, and the end of the telescopic rod away from the telescopic cylinder is fixedly connected with the push block.

[0011] Further, the push block is fixedly connected with a push rod on the side away from the intermediate die, the end of the push rod away from the push block is rotationally connected with a push wheel, and the bottom of the side die is rotationally connected with an oval push plate.

[0012] Further, a second circular block is rotationally connected to the inner wall bottom of the side die, the bottom end of the second circular block is fixedly connected with the oval push plate, a second adjusting slide rail is fixedly connected to the top of the second circular block, and the cross rod is slidingly connected with the second adjusting slide rail.

[0013] Further, the second adjusting slide rail comprises a second vertical upper section, a second spiral section and a second vertical lower section, the bottom end of the second vertical upper section is fixedly communicated with the top end of the second spiral section, and the bottom end of the second spiral section is fixedly communicated with the top end of the second vertical lower section.

[0014] Further, one side of the bending machine frame is fixedly connected with an outer U-shaped rod, the inner wall of the outer U-shaped rod is slidably connected with an inner U-shaped rod, and the inner U-shaped rod is fixedly connected with the bottom of the acute-angle straight knife.

[0015] Further, the top of the mounting frame is fixedly connected with a second hydraulic cylinder, the telescopic end of the second hydraulic cylinder is fixedly connected with a lifting block, the inner wall bottom of the outer U-shaped rod is fixedly connected with a third hydraulic cylinder, and the telescopic end of the third hydraulic cylinder is fixedly connected with the inner U-shaped rod.

[0016] The technical scheme provided by the present application has the following beneficial effects compared with the prior art: 1、The two trapezoidal inclined blocks are controlled to stretch outwards along the "L-shaped" track to the two sides of the middle mold, the two trapezoidal inclined blocks move along the "L-shaped" track from the bottom of the middle mold to the inside of the "F-shaped" structure on the two sides of the plate, the two trapezoidal inclined blocks press the second crease inside the "F-shaped" structure, and when the acute-angle straight knife processes the second crease to bend upwards, the bending angle and size of the second crease inside the "F-shaped" structure are prevented from deviating, so that the bending precision of the plate at the second crease is improved.

[0017] 2、The two push blocks are controlled to gradually approach the "vertical edge" of the plate (the "vertical edge" is the side surface of the "F-shaped" structure) on the two sides of the plate, the push blocks push the "vertical edge" that is deformed due to rebound to compensate the rebound error, the positions of the two push blocks are locked after the "vertical edge" that is deformed due to rebound is returned to the normal vertical state, the "vertical edge" of the plate is corrected, and the pre-correction processing of the "F-shaped" structure is completed.

[0018] 3、The two lower pressing claws are controlled to move vertically downwards above the "horizontal edge" of the plate (the "horizontal edge" is the upper surface of the "F-shaped" structure), the lower pressing claws push the "horizontal edge" that is deformed due to rebound to compensate the rebound error as the two lower pressing claws move downwards, the positions of the two lower pressing claws are locked after the "horizontal edge" that is deformed due to rebound is returned to the normal horizontal state, the "horizontal edge" of the plate is corrected, and the rebound correction processing of the "F-shaped" structure is completed.

[0019] 4、The application can complete the double compensation correction of the "F" shaped structure through controlling the one-time down movement of the horizontal rod, and the rebound deformation of the plate is returned and compensated according to the layer-by-layer progressive order, the rebound deformation of the "vertical edge" of the plate is avoided due to the direct pressing of the pressing claw, and then a stable foundation is provided for the second bending treatment of the short edge, the short edge after twice bending is smoothly matched with the long edge in the "F" shaped structure, and then the bending processing quality of the plate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application. Figure 2 It is a schematic diagram of the structure of the acute angle straight knife in the embodiment of the present application. Figure 3 It is a schematic diagram of the structure of the workbench in the embodiment of the present application. Figure 4 It is a schematic diagram of the structure of the rectangular plate in the embodiment of the present application. Figure 5 It is a schematic diagram of the structure of the side mold and the intermediate mold in the embodiment of the present application. Figure 6 It is a schematic diagram of the structure of the first hydraulic cylinder in the embodiment of the present application. Figure 7 It is a schematic diagram of the structure of the horizontal rod in the embodiment of the present application. Figure 8 It is a schematic diagram of the structure of the triangular plate and the pressing claw in the embodiment of the present application. Figure 9 It is a schematic diagram of the structure of the rotating straight rail in the embodiment of the present application. Figure 10 It is a schematic diagram of the structure of the right angle connecting rod and the trapezoidal inclined block in the embodiment of the present application. Figure 11 It is a schematic diagram of the structure of the L-shaped hole in the embodiment of the present application. Figure 12 It is a schematic diagram of the structure of the second adjusting sliding rail in the embodiment of the present application. Figure 13 It is a schematic diagram of the structure of the elastic element in the embodiment of the present application. Figure 14 It is a schematic diagram of the structure of the elliptical push plate in the embodiment of the present application. Figure 15A structure diagram for compensating and correcting the plate by the lower pressing claw in the embodiment of the present application.

[0022] The reference signs in the figure represent: 1, bending machine frame; 11, workbench; 12, mounting frame; 13, lifting rod; 14, lifting block; 15, middle die; 16, side die; 17, acute angle straight knife; 2, L-shaped hole; 21, pulley; 22, right-angle connecting rod; 23, trapezoidal inclined block; 3, first round block; 31, first adjusting sliding rail; 32, rotating straight rail; 33, cross bar; 34, first hydraulic cylinder; 311, first vertical upper section; 312, first spiral section; 313, first vertical lower section; 4, triangular plate; 41, lower pressing claw; 42, elastic element; 43, push block; 5, push rod; 51, push wheel; 52, oval push plate; 6, second round block; 61, second adjusting sliding rail; 611, second vertical upper section; 612, second spiral section; 613, second vertical lower section; 7, outer U-shaped rod; 71, inner U-shaped rod; 72, second hydraulic cylinder; 73, third hydraulic cylinder; 8, first crease; 81, second crease. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings of the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0024] The present application will be further described below in connection with the embodiments. EMBODIMENT

[0025] Please refer to Figures 1-15 The present application provides a technical solution: a bending machine die with limiting function, comprising: The bending machine frame 1 is fixedly connected with the workbench 11 at the top, the workbench 11 is fixedly connected with the mounting frame 12 at the top, the mounting frame 12 is slidingly connected with the lifting rod 13 at the top, the lifting rod 13 is fixedly connected with the lifting block 14 at the bottom end, the lifting block 14 is fixedly connected with one middle die 15 and two side dies 16 at the bottom respectively, and the bending machine frame 1 is slidingly connected with the acute angle straight knife 17 on one side. The inner wall bottom of the middle die 15 is provided with the L-shaped hole 2, the inner wall of the L-shaped hole 2 is slidingly connected with the pulley 21, the bottom end of the pulley 21 is fixedly connected with the right-angle connecting rod 22, and the end of the right-angle connecting rod 22 close to the acute angle straight knife 17 is fixedly connected with the trapezoidal inclined block 23.

[0026] The inner wall bottom of the intermediate die 15 is rotationally connected with a first circular block 3, the top of the first circular block 3 is fixedly connected with a first adjusting sliding rail 31, the circumferential outer surface of the first circular block 3 is fixedly connected with a rotating straight rail 32, the top end of the pulley 21 is slidingly connected in the interior of the rotating straight rail 32, the interior of the first adjusting sliding rail 31 is slidingly connected with a cross rod 33, the inner wall bottom of the lifting block 14 is fixedly connected with a first hydraulic cylinder 34, and the telescopic end of the first hydraulic cylinder 34 is fixedly connected with the cross rod 33.

[0027] The first adjusting sliding rail 31 comprises a first vertical upper section 311, a first spiral section 312 and a first vertical lower section 313, the bottom end of the first vertical upper section 311 is fixedly communicated with the top end of the first spiral section 312, and the bottom end of the first spiral section 312 is fixedly communicated with the top end of the first vertical lower section 313.

[0028] The circumferential outer surface of the cross rod 33 is fixedly connected with a triangular plate 4, the bottom of the triangular plate 4 is fixedly connected with a downward pressing claw 41, the bottom of the side die 16 is fixedly connected with an elastic element 42, and the telescopic end of the elastic element 42 is fixedly connected with a push block 43.

[0029] The elastic element 42 comprises a telescopic cylinder and a telescopic rod, the telescopic cylinder is fixedly connected at the bottom of the side die 16, the telescopic rod is slidingly connected in the interior of the telescopic cylinder, a return spring is fixedly connected between the telescopic rod and the telescopic cylinder, and one end of the telescopic rod away from the telescopic cylinder is fixedly connected with the push block 43.

[0030] The side, away from the intermediate die 15, of the push block 43 is fixedly connected with a push rod 5, one end of the push rod 5, away from the push block 43, is rotationally connected with a push wheel 51, and the bottom of the side die 16 is rotationally connected with an elliptical push plate 52.

[0031] The inner wall bottom of the side die 16 is rotationally connected with a second circular block 6, the bottom of the second circular block 6 is fixedly connected with the elliptical push plate 52, the top of the second circular block 6 is fixedly connected with a second adjusting sliding rail 61, and the cross rod 33 is slidingly connected with the second adjusting sliding rail 61.

[0032] The second adjusting sliding rail 61 comprises a second vertical upper section 611, a second spiral section 612 and a second vertical lower section 613, the bottom end of the second vertical upper section 611 is fixedly communicated with the top end of the second spiral section 612, and the bottom end of the second spiral section 612 is fixedly communicated with the top end of the second vertical lower section 613.

[0033] One side of the bending machine frame 1 is fixedly connected with an outer U-shaped rod 7, the inner wall of the outer U-shaped rod 7 is slidingly connected with an inner U-shaped rod 71, and the inner U-shaped rod 71 is fixedly connected with the bottom of the acute-angle straight knife 17.

[0034] The top of the mounting bracket 12 is fixedly connected to a second hydraulic cylinder 72, the telescopic end of the second hydraulic cylinder 72 is fixedly connected to the lifting block 14, the bottom of the inner wall of the outer U-shaped rod 7 is fixedly connected to a third hydraulic cylinder 73, and the telescopic end of the third hydraulic cylinder 73 is fixedly connected to the inner U-shaped rod 71.

[0035] Working principle: Formation of the "C" - shaped structure: In practical applications, as Figure 4 shown, by first bending successively along the first crease 8 and the second crease 81 of a set of long opposite sides, and then bending successively along the first crease 8 and the second crease 81 of a set of short opposite sides. Bending the long opposite sides first can make the stress distribution inside the rectangular plate relatively uniform. If the short opposite sides are bent first, since the short side length is shorter, the stress is concentrated in a smaller area. When the long opposite sides are bent subsequently, the redistribution of stress is likely to cause the previously bent short sides to deform. However, when the long opposite sides are bent first, the stress is released in a longer area. When the short sides are bent subsequently, the stress change is relatively small, which is beneficial to reducing the deformation of the plate, thereby obtaining Figure 4 the product in the lower middle part.

[0036] In practical applications, as Figure 1 and Figure 2 shown, place the plate on the upper surface of the workbench 11. By controlling the automatic feeding device (such as a vacuum chuck, the vacuum chuck adsorbs the thin plate and ensures the stability of the thin plate during movement. This automatic feeding device uses existing technology and is not shown in the drawings of the specification), the rectangular plate is moved on the upper surface of the workbench 11, so that one long side of the rectangular plate is located above the acute - angle straight knife 17, and the first crease 8 on this long side is located at the bending processing position of the acute - angle straight knife 17. By controlling the second hydraulic cylinder 72 to drive the lifting block 14, the middle die 15 and the side die 16 to move vertically downward. With the cooperation of the middle die 15, the side die 16 and the workbench 11, the middle die 15 and the side die 16 exert pressure on the rectangular plate on the workbench 11. Under the action of the pressure, the position of the rectangular plate is fixed. By controlling the third hydraulic cylinder 73 to drive the inner U - shaped rod 71 and the acute - angle straight knife 17 to move vertically upward. Under the limiting action of the middle die 15 and the side die 16, the upward - moving acute - angle straight knife 17 bends the plate upward by 90 degrees. Then the acute - angle straight knife 17 moves downward, and the middle die 15 and the side die 16 move upward to release the limitation of the middle die 15 and the side die 16 on the rectangular plate. Control the automatic feeding device to drive the thin plate to move slightly forward, so that the second crease 81 on this long side is located at the bending processing position of the acute - angle straight knife 17, and repeat the above steps to bend this long side again. After the secondary bending processing of this long side, perform the secondary bending processing on the other long side, so that both sides of the rectangular plate are in a "C" - shaped structure.

[0037] "Extension" of the middle die 15: In practical applications, such as Figure 1 and Figure 2 As shown, by controlling the automatic feeding device to drive the rectangular plate to move on the upper surface of the worktable 11, one short side of the rectangular plate is located above the acute-angle straight knife 17, and the first crease 8 on the short side is located at the bending processing position of the acute-angle straight knife 17. In summary, the short side can be bent along the first crease 8 for the first time. Then, the automatic feeding device is controlled to drive the rectangular plate to move slightly forward, so that the second crease 81 on the short side is located at the bending processing position of the acute-angle straight knife 17. By activating the second hydraulic cylinder 72, such as Figure 2 As shown, guided by the two lifting rods 13, the two second hydraulic cylinders 72 drive the lifting block 14 to move vertically downwards via their telescopic ends. The lifting block 14 then drives one intermediate mold 15 and two side molds 16 at its bottom to move vertically downwards, as shown. Figure 5 As shown, the intermediate mold 15 is located above the plate, and the two side molds 16 are located on both sides of the plate. At this time, with the cooperation of the intermediate mold 15 and the worktable 11, the intermediate mold 15 applies pressure to the plate, so that the plate is fixed on the worktable 11. However, due to the influence of the "U" shaped structure on both sides of the plate, the intermediate mold 15 has difficulty pressing the second crease 81 inside the "U" shaped structure. When the acute-angle straight knife 17 bends the second crease 81 on the short side upward, the bending angle and size of the second crease 81 inside the "U" shaped structure are prone to deviation, resulting in a decrease in the bending accuracy of the plate.

[0038] To overcome the above difficulties, this application adopts the following technical solution: like Figure 6 and Figure 7 As shown, by activating the first hydraulic cylinder 34, the three first hydraulic cylinders 34 drive the crossbar 33 to move vertically downward inside the middle mold 15 and the side mold 16 via their telescopic ends. Initially, the crossbar 33 moves downward along the first vertical upper section 311 inside the first adjusting slide rail 31. At this time, the two first circular blocks 3 are respectively limited by the first adjusting slide rail 31, and neither of the two first circular blocks 3 can rotate around its own axis. As the crossbar 33 continues to move downward, the crossbar 33 slides through the first helical section 312 to the first adjusting slide rail 31. At this time, guided by the first helical section 312, the vertically downward moving crossbar 33 pushes the first adjusting slide rail 31 to rotate around the axis of the first circular block 3 through the first helical section 312. The two first adjusting slide rails 31 drive the two first circular blocks 3 to rotate around the axis of the first circular block 3, as shown. Figure 8 and Figure 9 As shown, the rotating first circular block 3 drives the rotating straight rail 32 on its outer circumference to rotate around the axis of the first circular block 3, as follows. Figure 9 and Figure 10As shown, the two right-angle connecting rods 22 are respectively connected with the L-shaped hole 2 through the two pulleys 21, so that the movement track of the right-angle connecting rod 22 is in the shape of “L”, under the limiting action of the rotating straight rail 32 and the pulley 21, the rotating straight rail 32 rotating around the first circular block 3 drives the pulley 21 inside to slide along the inner wall of the L-shaped hole 2 (the pulley 21 slides to the two sides of the middle die 15), when the pulley 21 slides to the right-angle section of the L-shaped hole 2, the rotating straight rail 32 continues to drive the pulley 21 inside to slide along the inner wall of the L-shaped hole 2 (the pulley 21 moves close to the acute straight knife 17), after the pulley 21 moves to the end of the L-shaped hole 2 close to the acute straight knife 17, at this time, the crossbar 33 is just connected with the first vertical lower section 313 downward along the first spiral section 312, under the limiting action of the crossbar 33 and the first vertical lower section 313, the two first circular blocks 3 are limited and cannot rotate around the axis, so as to fix the position of the pulley 21 inside the L-shaped hole 2, through the above process, the pulley 21 sliding along the “L-shaped” track drives the right-angle connecting rod 22 at the bottom to move along the “L-shaped” track, so that the two right-angle connecting rods 22 drive the trapezoidal inclined block 23 at one end to move along the lower surface of the middle die 15 to the two sides of the middle die 15, when the trapezoidal inclined block 23 contacts with the side wall of the plate “|” shaped structure, the two right-angle connecting rods 22 drive the trapezoidal inclined block 23 at one end to move along the side wall of the plate “|” shaped structure to the second crease 81 of the plate, until one side of the trapezoidal inclined block 23 is above the second crease 81, at this time, as shown in the figure, the two trapezoidal inclined blocks 23 are close to the two sides of the middle die 15 respectively, and extend the middle die 15 in the bending length direction, so that the second crease 81 inside the plate “|” shaped structure is pressed by the trapezoidal inclined block 23, through starting the third hydraulic cylinder 73, under the limiting action of the outer U-shaped rod 7 and the inner U-shaped rod 71, the three third hydraulic cylinders 73 drive the inner U-shaped rod 71 and the acute straight knife 17 to move vertically upward through the telescopic end, the acute straight knife 17 cooperates with the middle die 15 and the two trapezoidal inclined blocks 23 to apply pressure to the plate, so that the plate is plastically deformed at the second crease 81, and the bending treatment of the plate at the second crease 81 is completed. Figure 11 As shown, the two trapezoidal inclined blocks 23 are close to the two sides of the middle die 15 respectively, and extend the middle die 15 in the bending length direction, so that the second crease 81 inside the plate “|” shaped structure is pressed by the trapezoidal inclined block 23, through starting the third hydraulic cylinder 73, under the limiting action of the outer U-shaped rod 7 and the inner U-shaped rod 71, the three third hydraulic cylinders 73 drive the inner U-shaped rod 71 and the acute straight knife 17 to move vertically upward through the telescopic end, the acute straight knife 17 cooperates with the middle die 15 and the two trapezoidal inclined blocks 23 to apply pressure to the plate, so that the plate is plastically deformed at the second crease 81, and the bending treatment of the plate at the second crease 81 is completed.

[0039] Through the middle die 15, the plate is pressed and fixed on the workbench 11, through the two trapezoidal inclined blocks 23 moving along the “L-shaped” track from the bottom of the middle die 15 to the inside of the “|” shaped structure on both sides of the plate, the two trapezoidal inclined blocks 23 press the second crease 81 inside the “|” shaped structure, and when the acute straight knife 17 subsequently bends the second crease 81 upward, the bending angle and size deviation of the second crease 81 inside the “|” shaped structure are avoided, so as to improve the bending precision of the plate at the second crease 81.

[0040] “|” shaped structure compensation correction: In practical applications, such as Figure 11 shown, after the first crease 8 and the second crease 81 on the long side of the sheet are bent successively, a "C" - shaped structure is formed. At this time, when the second crease 81 on the short side is bent upward by 90 degrees, ideally, the short side after two bends is as shown in Figure 4 the product in, and the short side after two bends fits with the long side in the "C" - shaped structure. However, due to the certain springback of the bent thin metal sheet, if the "C" - shaped structure of the long side undergoes springback deformation, it is difficult to provide a stable basis for the second bending process of the short side, resulting in the short side after two bends being difficult to fit with the long side in the "C" - shaped structure, thereby reducing the bending processing quality of the sheet.

[0041] To overcome the above difficulties, the present application adopts the following technical solutions: In practical applications, as described above, such as Figure 7 and Figure 12 shown, the cross - bar 33 moves vertically downward inside the middle die 15 and the side die 16. At the beginning, the cross - bar 33 moves downward along the second vertical upper section 611 inside the second adjustment slide rail 61. At this time, the two second round blocks 6 are respectively limited by the second adjustment slide rail 61, and neither of the two second round blocks 6 can rotate around its own axis. As the cross - bar 33 continues to move downward, the cross - bar 33 is slidably connected to the second adjustment slide rail 61 through the second spiral section 612. At this time, under the guiding action of the second spiral section 612, the vertically downward - moving cross - bar 33 pushes the second adjustment slide rail 61 to rotate around the axis of the second round block 6 through the second spiral section 612. The two second adjustment slide rails 61 drive the two second round blocks 6 to rotate around the axis of the second round block 6, as shown in Figure 12 and Figure 13 shown, the rotating second round block 6 drives the elliptical push plate 52 at its bottom to rotate around the axis of the second round block 6, as shown in Figure 14 shown, the rotating elliptical push plate 52 pushes the push rod 5 towards the sheet through the push wheel 51. The push rod 5 drives the push block 43 to approach the "vertical side" of the sheet (this "vertical side" is the side surface of the "C" - shaped structure) against the elastic force of the elastic element 42. The push blocks 43 on both sides of the sheet gradually approach the "vertical side" of the sheet. The push blocks 43 push the "vertical side" with springback deformation to compensate for the springback error. When the two push blocks 43 push the "vertical side" with springback deformation back to the normal vertical state, the cross - bar 33 slides downward along the second spiral section 612 and is slidably connected to the second vertical lower section 613. Under the limiting action of the cross - bar 33 and the second vertical lower section 613, the two second round blocks 6 are limited, and neither of the two second round blocks 6 can rotate around its own axis, thereby locking the positions of the two push blocks 43. The two push blocks 43 restrict the "vertical side" of the sheet from undergoing springback deformation and correct the "vertical side" of the sheet, completing the pre - correction process of the "C" - shaped structure.

[0042] As a further embodiment of the present application, with the continued downward movement of the crossbar 33, the triangular plates 4 on the circumferential outer surface of the crossbar 33 are driven to move vertically downward, and the two triangular plates 4 drive the downward pressing claws 41 at the bottom thereof to move vertically downward above the "horizontal edge" of the plate (the upper surface of the "F" shaped structure), and with the gradual downward movement of the two downward pressing claws 41, the downward moving downward pressing claws 41 push the "horizontal edge" that has rebounded to compensate for the rebound error, and when the two downward pressing claws 41 push the "horizontal edge" that has rebounded to return to the normal horizontal state, the three first hydraulic cylinders 34 stop moving, thereby locking the position of the two downward pressing claws 41, and the two downward pressing claws 41 limit the rebound deformation of the "horizontal edge" of the plate, correct the "horizontal edge" of the plate, and complete the rebound correction of the "F" shaped structure.

[0043] Through two times of compensation correction, the first compensation correction is for the "vertical edge" of the "F" shaped structure, and the second compensation correction is for the "horizontal edge" of the "F" shaped structure, and one downward movement of the crossbar 33 can complete the double compensation correction of the "F" shaped structure, and the rebound deformation of the plate is returned and compensated in a layer-by-layer progressive order, avoiding the rebound deformation of the "vertical edge" of the plate due to the direct downward pressing of the downward pressing claws 41, thereby providing a stable foundation for the second bending processing of the short edge, ensuring that the short edge after two times of bending is smoothly attached to the long edge in the "F" shaped structure, and thereby improving the bending processing quality of the plate.

[0044] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the foregoing embodiments of the present application have been described in detail, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features thereof; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A bending machine mold with a limiting function, comprising a bending machine frame (1), characterized in that: The top of the bending machine frame (1) is fixedly connected to a workbench (11), the top of the workbench (11) is fixedly connected to a mounting frame (12), the top of the mounting frame (12) is slidably connected to a lifting rod (13), the bottom end of the lifting rod (13) is fixedly connected to a lifting block (14), the bottom of the lifting block (14) is fixedly connected to an intermediate mold (15) and two side molds (16), and a sharp-angle straight knife (17) is slidably connected to one side of the bending machine frame (1). The inner wall of the intermediate mold (15) has an L-shaped hole (2) at the bottom. A pulley (21) is slidably connected to the inner wall of the L-shaped hole (2). A right-angle connecting rod (22) is fixedly connected to the bottom end of the pulley (21). A trapezoidal inclined block (23) is fixedly connected to the end of the right-angle connecting rod (22) near the acute-angle straight knife (17).

2. The bending machine mold with limiting function according to claim 1, characterized in that: The bottom of the inner wall of the intermediate mold (15) is rotatably connected to a first circular block (3), the top of the first circular block (3) is fixedly connected to a first adjusting slide rail (31), the outer circumference of the first circular block (3) is fixedly connected to a rotating straight rail (32), the top of the pulley (21) is slidably connected to the inside of the rotating straight rail (32), the inside of the first adjusting slide rail (31) is slidably connected to a crossbar (33), the bottom of the inner wall of the lifting block (14) is fixedly connected to a first hydraulic cylinder (34), and the telescopic end of the first hydraulic cylinder (34) is fixedly connected to the crossbar (33).

3. A bending machine mold with limiting function according to claim 2, characterized in that: The first adjusting slide rail (31) includes a first vertical upper section (311), a first spiral section (312) and a first vertical lower section (313). The bottom end of the first vertical upper section (311) is fixedly connected to the top end of the first spiral section (312), and the bottom end of the first spiral section (312) is fixedly connected to the top end of the first vertical lower section (313).

4. A bending machine mold with limiting function according to claim 2, characterized in that: A triangular plate (4) is fixedly connected to the outer circumference of the crossbar (33), and a pressing claw (41) is fixedly connected to the bottom of the triangular plate (4). An elastic element (42) is fixedly connected to the bottom of the side mold (16), and a push block (43) is fixedly connected to the telescopic end of the elastic element (42).

5. A bending machine mold with limiting function according to claim 4, characterized in that: The elastic element (42) includes a telescopic cylinder and a telescopic rod. The telescopic cylinder is fixedly connected to the bottom of the side mold (16). The telescopic rod is slidably connected inside the telescopic cylinder. A return spring is fixedly connected between the telescopic rod and the telescopic cylinder. The end of the telescopic rod away from the telescopic cylinder is fixedly connected to the push block (43).

6. A bending machine mold with limiting function according to claim 4, characterized in that: The push block (43) is fixedly connected to a push rod (5) on the side away from the middle mold (15). The push rod (5) is rotatably connected to a push wheel (51) at the end away from the push block (43). The bottom of the side mold (16) is rotatably connected to an elliptical push plate (52).

7. A bending machine mold with limiting function according to claim 6, characterized in that: The bottom of the inner wall of the side mold (16) is rotatably connected to a second round block (6), the bottom end of the second round block (6) is fixedly connected to an elliptical push plate (52), the top of the second round block (6) is fixedly connected to a second adjusting slide rail (61), and the crossbar (33) is slidably connected to the second adjusting slide rail (61).

8. A bending machine mold with a limiting function according to claim 7, characterized in that: The second adjusting slide rail (61) includes a second vertical upper section (611), a second spiral section (612), and a second vertical lower section (613). The bottom end of the second vertical upper section (611) is fixedly connected to the top end of the second spiral section (612), and the bottom end of the second spiral section (612) is fixedly connected to the top end of the second vertical lower section (613).

9. A bending machine mold with limiting function according to claim 1, characterized in that: An outer U-shaped rod (7) is fixedly connected to one side of the bending machine frame (1), and an inner U-shaped rod (71) is slidably connected to the inner wall of the outer U-shaped rod (7). The inner U-shaped rod (71) is fixedly connected to the bottom of the acute-angle straight knife (17).

10. A bending machine mold with limiting function according to claim 9, characterized in that: The top of the mounting bracket (12) is fixedly connected to a second hydraulic cylinder (72), the telescopic end of the second hydraulic cylinder (72) is fixedly connected to the lifting block (14), and the bottom of the inner wall of the outer U-shaped rod (7) is fixedly connected to a third hydraulic cylinder (73), the telescopic end of the third hydraulic cylinder (73) is fixedly connected to the inner U-shaped rod (71).

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