Anti-indentation bending die structure

Abstract

The invention relates to the technical field of bending dies, and discloses an anti-indentation bending die structure which comprises an upper die set and a lower die set, the upper die set comprises a die base and a blade die, a plurality of piston rods are fixedly installed on the upper surface of the blade die, a plurality of sliding plug cavities are formed in the lower surface of the die base, and the top ends of the piston rods are slidably installed in the sliding plug cavities correspondingly; a communicating hole is formed in the die holder, the sliding plug cavities are communicated through the communicating hole, a pressure release valve and a first input pipe are fixedly installed at the end of the die holder, a pressure release pipe is arranged on the surface of the pressure release valve, and the pressure release pipe is communicated with the communicating hole through the pressure release valve. According to the bending die, the upper die set is composed of the die base and the blade die, the blade die is slidably connected with the die base through the piston rod, in the bending machining process, when resistance borne by the blade die exceeds a preset value, hydraulic oil in the sliding plug cavity is discharged through the pressure relief pipe, the pressing depth of the blade die on a product is reduced, and the overload protection function is achieved; and the problem of indentation is solved.

Description

Technical Field

[0001] The invention relates to the technical field of bending moulds, and in particular to an anti-indentation bending mould structure. Background Art

[0002] During the bending process, due to the high extrusion stress, it is easy to cause indentation of the product. In order to solve the indentation problem, the patent document of the prior art with the patent number CN203695754U discloses a mirror stainless steel plate bending anti-indentation lower die, including a lower die base and a lower die groove opened on the lower die base, the groove top of the lower die groove is connected to the lower die base through a circular arc smooth transition, the two sides of the lower die groove protrude to the middle of the groove, the curvature of the middle of the lower die groove side is the largest at the upper position A, and the curvature gradually decreases from A to the upper and lower directions, and anti-indentation aviation umbrella cloth is laid on the two sides of the lower die groove and the upper side of the lower die base. The utility model solves the indentation in the bending process by designing the structure of the existing mold and the anti-indentation layer, avoids the cost of manual processing, and improves work efficiency.

[0003] In actual use, the existing bending mold has the highest extrusion force at the contact point between the upper mold and the plate, which is most likely to produce indentations, and the upper mold has no overload protection function, which is very inconvenient to use. Summary of the invention

[0004] The purpose of the present invention is to solve the disadvantage of many overload indentations in the existing bending dies in the prior art, and to propose an anti-indentation bending die structure.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an anti-indentation bending mold structure, including an upper mold group and a lower mold group, the upper mold group includes a mold base and a blade mold, a plurality of piston rods are fixedly installed on the upper surface of the blade mold, a plurality of sliding plug cavities are opened on the lower surface of the mold base, the top end of each piston rod is slidably installed in the sliding plug cavity, a connecting hole is opened in the mold base, and a plurality of sliding plug cavities are connected through the connecting hole, and a pressure relief valve and a first input pipe are fixedly installed on the ends of the mold base, a pressure relief pipe is arranged on the surface of the pressure relief valve, the pressure relief pipe is connected with the connecting hole through the pressure relief valve, the first input pipe is connected with the connecting hole, and a one-way valve is arranged at the connection between the first input pipe and the connecting hole. During the bending process, when the resistance encountered by the blade mold exceeds a preset value, the hydraulic oil in the sliding plug cavity is discharged by the pressure relief pipe, thereby reducing the pressure depth of the blade mold on the product, so that it has the function of overload protection.

[0006] Preferably, the lower mold assembly includes a lower module and a base, the upper surface of the lower module is provided with a molding groove, the lower side of the blade mold can be slidably inserted into the molding groove, a plurality of hydraulic telescopic rods are fixedly installed on the upper surface of the base, the lower module is arranged on the upper side of the base, and the telescopic ends of the hydraulic telescopic rods are fixedly connected to the lower module, a second input pipe is fixedly installed at the end of the base, an oil delivery channel is provided inside the base, the second input pipe is connected with the inner cavity of each hydraulic telescopic rod through the oil delivery channel, the surfaces of the plurality of hydraulic telescopic rods are all sleeved with support springs, the two ends of the support springs are respectively pressed against the lower module and the base, when the lower module is subjected to downward pressure, the lower module overcomes the action of the hydraulic telescopic rods and the support springs and moves downward.

[0007] Preferably, two movable plates are slidably installed on the upper surface of the lower module, and a transmission assembly is arranged between the lower module and the base. The two movable plates are adjusted to be closer to or farther away from each other by the transmission assembly. The two movable plates are respectively arranged on both sides of the forming groove. Rolling shafts are rotatably installed on the side of the two movable plates close to the forming groove. The rolling shafts act as fulcrums. Under normal conditions, the two movable plates are away from each other, and the distance between the rolling shafts on both sides is increased. The distance between the fulcrum acting on the plate to be bent and the blade die is increased, thereby reducing the force of the plate to be bent against the blade die.

[0008] Preferably, the transmission assembly includes a vertical plate and a guide sleeve, the vertical plate is fixedly mounted on the lower side of the movable plate, the guide sleeve is fixedly connected to the side surface of the vertical plate, a guide hole is opened on the side of the lower module, the guide sleeve is slidably inserted in the guide hole, a return spring is arranged in the guide sleeve, and the two ends of the return spring respectively press against the sides of the vertical plate and the lower module.

[0009] Among them, an installation cavity is opened on the upper surface of the base, and the lower module is movably arranged in the installation cavity. The two sides of the installation cavity are inclined surfaces. The lower end of the vertical plate is rotatably installed with rollers, and the rollers can roll along the surface of the inclined surface. When the lower module moves up and down, the two movable plates can be adjusted to be closer to or farther away from each other, thereby achieving the effect of adjusting the fulcrum position acting on the lower side of the plate to be bent.

[0010] Preferably, when the hydraulic telescopic rod lifts the lower module upward, under the action of the return spring, the two movable plates move away from each other, and the distance between the rolling shafts on both sides increases.

[0011] Preferably, when the lower module is subjected to downward pressure, the lower module overcomes the force of the hydraulic telescopic rod and the supporting spring and moves downward, the roller rolls along the surface of the inclined surface, the two movable plates move closer to each other, and the distance between the rolling axes on both sides decreases.

[0012] The present invention has the following beneficial effects:

[0013] 1. The bending die proposed in the present invention comprises an upper die group consisting of a die base and a blade die, and the blade die is slidably connected to the die base through a piston rod. During the bending process, when the resistance applied to the blade die exceeds a preset value, the hydraulic oil in the sliding plug cavity is discharged through a pressure relief pipe, thereby reducing the pressure depth of the blade die on the product, making it have an overload protection function and solving the problem of indentation.

[0014] 2. The bending die proposed in the present invention comprises a lower die assembly consisting of a base and a lower module, and two movable plates with adjustable spacing are arranged on the upper side of the lower module, and a rolling shaft is in contact with the sheet to be bent, and the rolling shaft acts as a fulcrum. Under normal conditions, the two movable plates are away from each other, and the spacing between the rolling shafts on both sides increases, and the spacing between the fulcrum acting on the sheet to be bent and the blade die increases, thereby reducing the force of the sheet to be bent against the blade die and further reducing the generation of indentations.

[0015] 3. The bending mold proposed in the present invention has a transmission component set in the lower mold group. When the lower module is subjected to downward pressure, the lower module overcomes the action force of the hydraulic telescopic rod and the supporting spring and moves downward. The roller rolls along the surface of the inclined surface, and the two movable plates are driven to move closer to each other through the transmission component. The spacing between the rolling shafts on both sides is reduced, and the rolling shaft provides a force toward the blade mold for the plate to be bent to assist in bending. The lower mold group and the upper mold group work together to make the plate to be bent subject to the downward bending pressure of the blade mold and the bending pressure of the rolling shaft, ensuring that the resistance to the blade mold does not exceed the preset value of the pressure relief valve, thereby completing the bending work and achieving the effect of preventing indentation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the bending mold proposed by the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure enlargement at point A;

[0018] Figure 3 It is a schematic diagram of the front cross-section structure of the mold base proposed by the present invention;

[0019] Figure 4 The side section structure of the lower module proposed by the present invention is shown in FIG. Figure 1 ;

[0020] Figure 5 The side section structure of the lower module proposed by the present invention is shown in FIG. Figure 2 ;

[0021] Figure 6 This is a schematic side structural diagram of the bending die proposed in the present invention.

[0022] In the figure: 1 die base, 2 blade die, 3 piston rod, 4 slide plug cavity, 5 connecting hole, 6 pressure relief valve, 7 first input pipe, 8 pressure relief pipe, 9 one-way valve, 10 lower module, 11 base, 12 forming groove, 13 hydraulic telescopic rod, 14 second input pipe, 15 support spring, 16 movable plate, 17 rolling shaft, 18 vertical plate, 19 guide sleeve, 20 return spring, 21 inclined surface, 22 roller. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] Reference Figure 1-Figure 6 , an anti-indentation bending die structure, including an upper die set and a lower die set.

[0026] Among them, the upper die set includes a die base 1 and a blade die 2, a plurality of piston rods 3 are fixedly installed on the upper surface of the blade die 2, a plurality of sliding plug cavities 4 are opened on the lower surface of the die base 1, the top ends of the piston rods 3 are respectively slidably installed in the sliding plug cavities 4, a connecting hole 5 is opened in the die base 1, and a plurality of sliding plug cavities 4 are connected through the connecting hole 5, a pressure relief valve 6 and a first input pipe 7 are respectively fixedly installed on the ends of the die base 1, a pressure relief pipe 8 is arranged on the surface of the pressure relief valve 6, the pressure relief pipe 8 is connected with the connecting hole 5 through the pressure relief valve 6, the first input pipe 7 is connected with the connecting hole 5, and a one-way valve 9 is arranged at the connection between the first input pipe 7 and the connecting hole 5, and the one-way valve 9 has the function of preventing backflow, see Figure 3 The hydraulic oil is injected into the connecting hole 5 and the sliding plug cavity 4 from the first input pipe 7, and the pressure relief value of the pressure relief valve 6 is adjusted. When the piston rod 3 moves upward, the hydraulic oil in the sliding plug cavity 4 is squeezed. When the internal pressure of the hydraulic oil exceeds the pressure relief value of the pressure relief valve 6, the hydraulic oil in the connecting hole 5 is discharged from the pressure relief pipe 8.

[0027] It should be noted that the pressure relief valve 6 has the function of specifically adjusting the pressure relief value. The pressure relief valve 6 belongs to the existing mature technology and will not be described in detail here.

[0028] The lower die assembly includes a lower die block 10 and a base 11 . A molding groove 12 is provided on the upper surface of the lower die block 10 . The lower side of the blade die 2 can be slidably inserted into the molding groove 12 .

[0029] like Figure 5 As shown, a plurality of hydraulic telescopic rods 13 are fixedly mounted on the upper surface of the base 11, the lower module 10 is arranged on the upper side of the base 11, and the telescopic ends of the hydraulic telescopic rods 13 are fixedly connected to the lower module 10, and a second input pipe 14 is fixedly mounted on the end of the base 11, an oil delivery channel is opened inside the base 11, and the second input pipe 14 is connected to the inner cavity of each hydraulic telescopic rod 13 through the oil delivery channel, wherein the surfaces of the plurality of hydraulic telescopic rods 13 are sleeved with support springs 15, and the two ends of the support springs 15 are respectively pressed against the lower module 10 and the base 11.

[0030] In this embodiment, Figure 4 As shown, two movable plates 16 are slidably installed on the upper surface of the lower module 10, and a transmission component is arranged between the lower module 10 and the base 11. The two movable plates 16 are adjusted to move closer to or away from each other by the transmission component. The two movable plates 16 are respectively arranged on both sides of the forming groove 12, and a rolling shaft 17 is rotatably installed on the side of the two movable plates 16 close to the forming groove 12.

[0031] Specifically, the transmission assembly includes a vertical plate 18 and a guide sleeve 19. The vertical plate 18 is fixedly installed on the lower side of the movable plate 16. The guide sleeve 19 is fixedly connected to the side surface of the vertical plate 18. A guide hole is opened on the side of the lower module 10. The guide sleeve 19 is slidably inserted in the guide hole. A return spring 20 is arranged in the guide sleeve 19. The two ends of the return spring 20 are respectively pressed against the sides of the vertical plate 18 and the lower module 10.

[0032] The upper surface of the base 11 is provided with an installation cavity, and the lower module 10 is movably arranged in the installation cavity. The two sides of the installation cavity are inclined surfaces 21 . The lower end of the vertical plate 18 is rotatably provided with a roller 22 , and the roller 22 can roll along the surface of the inclined surface 21 .

[0033] In this embodiment, when hydraulic oil is injected into the hydraulic telescopic rod 13 through the second input pipe 14, the telescopic end of the hydraulic telescopic rod 13 extends upward. When the hydraulic telescopic rod 13 lifts the lower module 10 upward, under the action of the reset spring 20, the two movable plates 16 move away from each other, and the spacing between the rolling shafts 17 on both sides increases. The rolling shafts 17 on both sides serve as the fulcrum of the plate to be bent, so that the fulcrum on the lower side of the plate to be bent is away from the blade die 2, thereby increasing the length of the force arm and reducing the force required to bend the plate.

[0034] When the lower module 10 is subjected to downward pressure, the hydraulic oil in the hydraulic telescopic rod 13 can be discharged from the second input pipe 14. At this time, the lower module 10 overcomes the force of the hydraulic telescopic rod 13 and the support spring 15 and moves downward. The roller 22 rolls along the surface of the inclined surface 21, and the two movable plates 16 move closer to each other. The distance between the rolling shafts 17 on both sides is reduced. At this time, the rolling shafts 17 provide a bending auxiliary force for the bent plate.

[0035] Working principle: During use, Figure 5 As shown, the plate to be bent is placed on the upper side of the movable plate 16, and the upper die set moves downward to bend the plate to be bent. At this time, the rolling shafts 17 on both sides serve as the fulcrum of the plate to be bent until Figure 6 In the state shown, at this time, the hydraulic oil in the hydraulic telescopic rod 13 is discharged through the second input pipe 14, and under the action of the downward pressure of the upper mold assembly, the lower mold block 10 overcomes the action of the hydraulic telescopic rod 13 and the support spring 15 and moves downward, and the roller 22 rolls along the surface of the inclined surface 21, driving the two movable plates 16 to move closer to each other, and the distance between the rolling shafts 17 on both sides is reduced;

[0036] The rolling shaft 17 provides a force for the plate to be bent in the direction of the blade die 2 to assist the bending. The lower die set and the upper die set work together to make the plate to be bent receive the downward bending pressure of the blade die 2 and the bending pressure of the rolling shaft 17, ensuring that the resistance received by the blade die 2 does not exceed the preset value of the pressure relief valve 6, and the bending work is completed;

[0037] When the bending part of the sheet to be bent contacts the bottom of the forming groove 12, the resistance encountered by the blade die 2 increases, and the piston rod 3 moves upward in the slide plug cavity 4, squeezing the hydraulic oil in the slide plug cavity 4. When the internal pressure of the hydraulic oil exceeds the pressure relief value of the pressure relief valve 6, the hydraulic oil in the connecting hole 5 is discharged from the pressure relief pipe 8. Since there is a gap between the blade die 2 and the die base 1, even if the die base 1 moves downward, the blade die 2 will not move downward with the die base 1, thereby reducing the pressure depth of the blade die 2 on the product and giving it an overload protection function.

[0038] The bending die proposed in the present invention comprises an upper die group consisting of a die base 1 and a blade die 2, and the blade die 2 is slidably connected to the die base 1 through a piston rod 3. During the bending process, when the resistance encountered by the blade die 2 exceeds a preset value, the hydraulic oil in the sliding plug cavity 4 is discharged from the pressure relief pipe 8, thereby reducing the pressing depth of the blade die 2 on the product, so that it has an overload protection function and solves the problem of indentation. The lower die group comprises a base 11 and a lower module 10, and two movable plates 16 with adjustable spacing are arranged on the upper side of the lower module 10, and a rolling shaft 17 is in contact with the plate to be bent, and the rolling shaft 17 acts as a fulcrum. Under normal conditions, the two movable plates 16 are away from each other, and the spacing between the rolling shafts 17 on both sides is increased. The spacing between the fulcrum acting on the plate to be bent and the blade die 2 is increased, thereby reducing the force of the plate to be bent against the blade die 2 and achieving the effect of preventing indentation.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An anti-indentation bending die structure, comprising an upper die set and a lower die set, characterized in that: The upper die assembly comprises a die base (1) and a blade die (2); a plurality of piston rods (3) are fixedly mounted on the upper surface of the blade die (2); a plurality of sliding plug cavities (4) are provided on the lower surface of the die base (1); the top ends of the piston rods (3) are slidably mounted in the sliding plug cavities (4); a connecting hole (5) is provided in the die base (1); the plurality of sliding plug cavities (4) are connected through the connecting hole (5); a pressure relief valve (6) and a first input pipe (7) are fixedly mounted on the ends of the die base (1); a pressure relief pipe (8) is provided on the surface of the pressure relief valve (6); the pressure relief pipe (8) is connected to the connecting hole (5) through the pressure relief valve (6); the first input pipe (7) is connected to the connecting hole (5); and a one-way valve (9) is provided at the connection between the first input pipe (7) and the connecting hole (5).

2. The anti-indentation bending mold structure according to claim 1, characterized in that: The lower die assembly comprises a lower die block (10) and a base (11); a molding groove (12) is provided on the upper surface of the lower die block (10); and the lower side of the blade die (2) can be slidably inserted into the molding groove (12).

3. The anti-indentation bending mold structure according to claim 2, characterized in that: A plurality of hydraulic telescopic rods (13) are fixedly mounted on the upper surface of the base (11); the lower module (10) is arranged on the upper side of the base (11); and the telescopic ends of the hydraulic telescopic rods (13) are fixedly connected to the lower module (10); a second input pipe (14) is fixedly mounted on the end of the base (11); an oil delivery channel is provided inside the base (11); and the second input pipe (14) is connected to the inner cavity of each hydraulic telescopic rod (13) through the oil delivery channel.

4. The anti-indentation bending mold structure according to claim 3, characterized in that: The surfaces of the plurality of hydraulic telescopic rods (13) are all sleeved with support springs (15), and the two ends of the support springs (15) are respectively pressed against the lower module (10) and the base (11).

5. The anti-indentation bending mold structure according to claim 4, characterized in that: Two movable plates (16) are slidably mounted on the upper surface of the lower module (10); a transmission assembly is arranged between the lower module (10) and the base (11); the two movable plates (16) are adjusted to move closer to or farther from each other by the transmission assembly; the two movable plates (16) are respectively arranged on both sides of the forming groove (12); and a rolling shaft (17) is rotatably mounted on one side of the two movable plates (16) close to the forming groove (12).

6. The anti-indentation bending mold structure according to claim 5, characterized in that: The transmission assembly comprises a vertical plate (18) and a guide sleeve (19); the vertical plate (18) is fixedly mounted on the lower side of the movable plate (16); the guide sleeve (19) is fixedly connected to the side surface of the vertical plate (18); a guide hole is provided on the side of the lower module (10); the guide sleeve (19) is slidably inserted into the guide hole; a return spring (20) is arranged in the guide sleeve (19); the two ends of the return spring (20) respectively press against the side surfaces of the vertical plate (18) and the lower module (10).

7. The anti-indentation bending mold structure according to claim 6, characterized in that: The upper surface of the base (11) is provided with an installation cavity, the lower module (10) is movably arranged in the installation cavity, the two sides of the installation cavity are inclined surfaces (21), and the lower end of the vertical plate (18) is rotatably provided with a roller (22), and the roller (22) can roll along the surface of the inclined surface (21).

8. The anti-indentation bending mold structure according to claim 7, characterized in that: When the hydraulic telescopic rod (13) lifts the lower module (10) upward, under the action of the return spring (20), the two movable plates (16) move away from each other, and the distance between the rolling shafts (17) on both sides increases.

9. The anti-indentation bending mold structure according to claim 8, characterized in that: When the lower module (10) is subjected to downward pressure, the lower module (10) overcomes the force of the hydraulic telescopic rod (13) and the supporting spring (15) and moves downward, the roller (22) rolls along the surface of the inclined surface (21), the two movable plates (16) move closer to each other, and the distance between the rolling shafts (17) on both sides decreases.

Images