Negative angle bending die for rolling shaft turning plate

Abstract

The utility model provides a negative angle bending die for a rolling shaft turning plate. The negative angle bending die comprises an upper die base and a lower die base, the upper die base is provided with an upper bending punch and upper die slotting tools symmetrically arranged on the two sides of the upper bending punch. A stripper plate is arranged at the position, corresponding to the upper bending punch, of the lower die base, lower bending turning plate punches are rotationally arranged at the two ends of the stripper plate, a first reset assembly is arranged below the stripper plate, and the lower bending turning plate punches move upwards under the action of the first reset assembly when the die is opened. The lower die base is further provided with a pair of lower die sliding blocks which are located on the two sides of the stripper plate respectively, the upper ends of the sides, close to the stripper plate, of the lower die sliding blocks are provided with bending angles, the lower bending turning plate punches are turned upwards when the die is closed, the lower die sliding blocks are further provided with second reset assemblies, and the lower die sliding blocks move outwards under the action of the second reset assemblies when the die is opened. When the turning plate and the sliding block synchronously move, friction between the downward bending turning plate punch and a workpiece is extremely small, and the surface of the workpiece is free of scratches and indentations.

Description

Technical Field

[0001] The utility model relates to the technical field of negative angle bending structures, in particular to a roller flap negative angle bending die. Background Art

[0002] Junction boxes are used in power lines to connect, protect and manage wires and cables. Junction boxes are usually made of plastic or metal. Metal junction boxes have significant advantages over plastic junction boxes in terms of fire prevention, heat conduction, corrosion resistance, waterproof and dustproof, service life, insulation and impact resistance.

[0003] In the process of preparing metal junction boxes, part of the workpiece needs to be bent and flanging to form a symmetrical right-angle structure on both sides. When the workpiece is made of stainless steel with high hardness, if the mold is directly used to bend the two sides of the workpiece to a right angle state, the bent part of the workpiece will rebound and be larger than the right angle after the mold is opened, and the right-angle structure cannot be formed. Therefore, a negative angle bending structure on both sides is used to complete the bending and flanging of the workpiece.

[0004] The prior art discloses a hardware stamping die for negative-angle bending, comprising an upper die unit and a lower die unit arranged below the upper die unit; the upper die unit is provided with a first bending pendulum block and a second bending pendulum block, the first bending pendulum block and the second bending pendulum block are arranged adjacent to each other, and the first bending pendulum block and the second bending pendulum block are rotatably installed; a plunger is arranged on one side of the second bending pendulum block; the lower die unit is provided with a fixed block corresponding to the first bending pendulum block and a sliding block corresponding to the second bending pendulum block, the fixed block is provided with a first lower die ejection pin assembly, and the sliding block is provided with a second lower die ejection pin assembly; the sliding block is away from the fixed block A slot corresponding to the inserting knife is provided at the upper end of one side of the block, and the sliding block moves toward the fixed block under the action of the inserting knife; a lower stripping plate is provided between the fixed block and the sliding block, and the lower end of the lower stripping plate is connected to a first elastic reset assembly, a first bending angle is provided at the upper end of one side of the fixed block close to the lower stripping plate, and a second bending angle is provided at the upper end of one side of the sliding block close to the lower stripping plate; the first bending swing block is in a straightened state under the upward push of the first lower die ejecting pin assembly during the bending process along the first bending angle, and the second bending swing block is in a straightened state under the upward push of the second lower die ejecting pin assembly during the bending process along the second bending angle. The prior art can realize the negative angle bending of metal workpieces in one-time forming, and rollers are also provided at the ends of the first and second bending angles to convert the sliding friction between the bending angle and the workpiece into rolling friction, thereby reducing the degree of scratches and indentations on the workpiece.

[0005] The defect of the prior art is that the roller is in direct contact with the surface of the workpiece, and linear force deformation occurs during bending, which cannot eliminate scratches and indentations on the surface of the workpiece. Therefore, the prior art needs to be improved. Utility Model Content

[0006] The utility model provides a roller flap negative angle bending die to solve the above problem.

[0007] A technical solution adopted by the utility model is: to provide a roller flap negative angle bending die, comprising: an upper die seat and a lower die seat;

[0008] The upper die seat is provided with an upper bending punch and upper die inserts symmetrically arranged on both sides of the upper bending punch;

[0009] A stripping plate is arranged on the lower die seat at a position corresponding to the upper bending punch, and lower bending flap punches are rotatably arranged at both ends of the stripping plate. A first reset component is arranged below the stripping plate, and moves upward under the action of the first reset component when the die is opened;

[0010] A pair of lower die slides are also provided on the lower die base, which are respectively located on both sides of the stripping plate. The upper end of the lower die slide close to the stripping plate has a bending angle, which makes the lower bending flap punch flip upward when the mold is closed. The lower die slide also has a second reset component, which moves outward under the action of the second reset component when the mold is opened.

[0011] Furthermore, the lower bending flap punch and the stripping plate are rotationally connected via a roller.

[0012] Furthermore, a lower hanging rod is provided on the lower die slide block, and an upper hanging rod is provided on the end of the lower bending flap punch on the same side away from the stripping plate, and a flap reset tension spring is provided between the upper hanging rod and the lower hanging rod, which pulls the lower bending flap punch to reset when the die is opened.

[0013] Furthermore, the first reset assembly includes a gas lift rod, a gas lift plate and a connecting rod, the gas lift rod is arranged on the punch press below the lower die base, the gas lift plate is arranged between the lower die base and the gas lift rod, the connecting rod passes through the lower die base, the upper end is fixedly connected to the stripping plate, and the lower end is fixedly connected to the gas lift plate.

[0014] Furthermore, the second reset assembly includes a fixed rod and a reset spring, wherein the lower end of the fixed rod is fixedly connected to the lower mold base, and the upper end extends into the lower mold slider. The reset spring is arranged between the lower mold slider and the fixed rod and is compressed when the mold is closed.

[0015] Furthermore, a roller is provided on the bending angle, and when the mold is closed, there is rolling contact between the roller and the lower bending flap punch, which reduces wear and prolongs the service life of the mold.

[0016] The beneficial effects of the roller flap negative angle bending die of the utility model are:

[0017] 1. Design a stripping plate with a lower bending flap punch. When the mold is closed, the lower die slider flips the lower bending flap punch to perform negative angle bending on the workpiece. When the flap and the slider are turned synchronously, there is very little friction between the lower bending flap punch and the workpiece, and there is no scratch or indentation on the workpiece surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the mold opening state of a roller flap negative angle bending mold in the first embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of a roller flap negative angle bending mold in a closed mold state in the first embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the position of the flap reset tension spring of the first embodiment of the utility model;

[0021] The markings of the components in the accompanying drawings are as follows: 1. upper die base, 2. lower die base, 11. upper bending punch, 12. upper die insert, 21. stripping plate, 22. lower bending flap punch, 23. first reset assembly, 24. lower die slider, 25. second reset assembly, 26. flap reset tension spring, 231. air top plate, 232. connecting rod, 241. roller, 251. fixing rod, 252. reset spring. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "front", "back", "horizontal", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention. They cannot indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] See also Figures 1 to 3 The first embodiment of the utility model provides a roller flap negative angle bending die, comprising: an upper die base 1 and a lower die base 2;

[0025] The upper die base 1 is provided with an upper bending punch 11 and upper die inserts 12 symmetrically arranged on both sides of the upper bending punch 11. When the die is closed, the upper bending punch 11 and the upper die insert 12 move downward with the upper die base 1.

[0026] A stripping plate 21 is provided on the lower die base 2 at a position corresponding to the upper bending punch 11, and lower bending flap punches 22 are rotatably provided at both ends of the stripping plate 21. A first reset component 23 is provided below the stripping plate 21. When the die is closed, the upper bending punch 11 pushes the stripping plate 21 and the workpiece thereon to move downward together. When the die is opened, the stripping plate 21 is moved upward and reset by the first reset component 23;

[0027] A pair of lower die slides 24 are also provided on the lower die base 2, which are respectively located on both sides of the stripper plate 21. The upper end of the lower die slide 24 away from the stripper plate 21 has an inclined surface. When the mold is closed, it moves horizontally toward the stripper plate 21 under the action of the corresponding upper die insert 12. The upper end of the lower die slide 24 close to the stripper plate 21 has a bending angle, which makes the lower bending flap punch 22 flip upward when the mold is closed. A second reset component 25 is also provided at the bottom of the lower die slide 24, which moves outward and resets under the action of the second reset component 25 when the mold is opened.

[0028] Specifically, the lower bending flap punch 22 is rotatably connected to the stripping plate 21 via a roller, and the lower bending flap punch 22 can be replaced to meet different negative angle bending requirements.

[0029] Specifically, a roller 241 is provided on the bending corner of the lower die slide block 24, and is in rolling contact with the lower bending flap punch 22 when the die is closed, so that the wear is small and the die life is long.

[0030] A lower hanging rod is also provided on the lower mold slider 24, and an upper hanging rod is also provided on the end of the lower bending flap punch 22 on the same side away from the stripping plate 21, and a flap reset tension spring 26 is provided between the upper hanging rod and the lower hanging rod. When the mold is closed, the flap reset tension spring 26 is stretched, and when the mold is opened, the flap reset tension spring 26 pulls the lower bending flap punch 22 to reset.

[0031] The first reset assembly 23 includes a gas ejector rod, a gas ejector plate 231 and a connecting rod 232. The gas ejector rod is arranged on the punch press below the lower die base 2. The gas ejector plate 231 is arranged between the lower die base 2 and the gas ejector rod. The connecting rod 232 passes through the lower die base 2. The upper end is fixedly connected to the stripping plate 21, and the lower end is fixedly connected to the gas ejector plate 231. When the mold is closed, the stripping plate 21 drives the connecting rod 232 and the gas ejector plate 231 to move downward to depress the gas ejector rod. When the mold is opened, the gas ejector rod rises to reset the stripping plate 21.

[0032] Specifically, a plurality of lower pads are arranged between the lower die base 2 and the punch press to provide space for the air lift rod to move. The floating height of the air lift rod can be adjusted by the punch press height and the air pressure, thereby controlling the stroke of the air lift plate 231. Using the air lift rod instead of the spring as a reset component is suitable for molds with larger strokes.

[0033] The second reset assembly 25 includes a fixed rod 251 and a reset spring 252. The lower end of the fixed rod 251 is fixedly connected to the lower mold base 2, and the upper end extends into the lower mold slider 24. The reset spring 252 is arranged between the lower mold slider 24 and the fixed rod 251. It is compressed when the mold is closed. When the mold is opened, the reset spring 252 rebounds to reset the lower mold slider 24.

[0034] Specifically, a limit block is also provided on the outer side of the lower die slide block 24 to limit its retraction position.

[0035] The beneficial effects of the roller flap negative angle bending die of the utility model are:

[0036] 1. Design a stripping plate with a lower bending flap punch. When the mold is closed, the lower die slider flips the lower bending flap punch to perform negative angle bending on the workpiece. When the flap and the slider are turned synchronously, there is very little friction between the lower bending flap punch and the workpiece, and there is no scratch or indentation on the workpiece surface;

[0037] 2. The first reset component uses a gas ejector as a pressure source to control the reset of the stripper plate, which is suitable for molds with a larger reset stroke;

[0038] 3. A roller is designed at the bending angle of the lower die slider, and the roller is used to flip the lower bending flap punch, which reduces wear and prolongs the service life of the die.

[0039] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A roller flap negative angle bending die, characterized in that: include: Upper die base and lower die base; The upper die seat is provided with an upper bending punch and upper die inserts symmetrically arranged on both sides of the upper bending punch; A stripping plate is arranged on the lower die seat at a position corresponding to the upper bending punch, and lower bending flap punches are rotatably arranged at both ends of the stripping plate. A first reset component is arranged below the stripping plate, and moves upward under the action of the first reset component when the die is opened; A pair of lower die slides are also provided on the lower die base, which are respectively located on both sides of the stripping plate. The upper end of the lower die slide close to the stripping plate has a bending angle, which makes the lower bending flap punch flip upward when the mold is closed. The lower die slide also has a second reset component, which moves outward under the action of the second reset component when the mold is opened.

2. The roller flap negative angle bending die according to claim 1, characterized in that: A lower hanging rod is also provided on the lower die slide block, and an upper hanging rod is also provided on the end of the lower bending flap punch on the same side away from the stripping plate, and a flap reset tension spring is provided between the upper hanging rod and the lower hanging rod to pull the lower bending flap punch to reset when the die is opened.

3. A roller flap negative angle bending die according to any one of claims 1 or 2, characterized in that: The first reset assembly includes a gas ejector rod, a gas ejector plate and a connecting rod. The gas ejector rod is arranged on the punch press below the lower die base, the gas ejector plate is arranged between the lower die base and the gas ejector rod, the connecting rod passes through the lower die base, the upper end is fixedly connected to the stripping plate, and the lower end is fixedly connected to the gas ejector plate.

4. The roller flap negative angle bending die according to claim 3, characterized in that: The second reset assembly includes a fixed rod and a reset spring. The lower end of the fixed rod is fixedly connected to the lower mold base, and the upper end extends into the lower mold slider. The reset spring is arranged between the lower mold slider and the fixed rod and is compressed when the mold is closed.

5. The roller flap negative angle bending die according to claim 4, characterized in that: A roller is arranged on the bending corner.

6. A roller flap negative angle bending die according to any one of claims 1 or 2, characterized in that: The second reset assembly includes a fixed rod and a reset spring. The lower end of the fixed rod is fixedly connected to the lower mold base, and the upper end extends into the lower mold slider. The reset spring is arranged between the lower mold slider and the fixed rod and is compressed when the mold is closed.

7. The roller flap negative angle bending die according to claim 6, characterized in that: A roller is arranged on the bending corner.

Images