High-precision bending die with self-adaptive rollers

Abstract

The invention relates to the field of bending dies, and provides a high-precision bending die with self-adaptive rollers. Round steel is placed in a first groove of a female die and a second groove of a side block, the two ends of the round steel are located in arc-shaped containing grooves, the round steel is placed on a self-adaptive roller mechanism, and an upper die base moves downwards to drive a male die to move downwards; due to rolling friction of the symmetrical self-adaptive roller mechanisms on the two sides, sliding friction of a traditional die is converted into rolling friction, precise forming with the friction coefficient smaller than or equal to 0.1 is achieved, the surface roughness Ra of the round steel is reduced to be smaller than or equal to 1.6 micrometers, and the bending strength Ra of the round steel is improved. Ra of a traditional mold is larger than or equal to 4.0 microns, the scratch defect is completely eliminated, and the yield is increased to 98% or above; and the two side blocks can be in threaded connection with the threaded holes of the working frame through the threaded rods, so that the positions are transversely moved to adapt to bending of round steel with different lengths.

Description

Technical Field

[0001] The present invention relates to the field of bending dies, and particularly to a high-precision bending die with adaptive rollers. Background Art

[0002] During the production process, round steel needs to be bent into a U-shaped form to adapt to different application scenarios and meet specific engineering requirements. Traditional round steel bending dies mostly adopt a fixed concave die structure, and the bending is achieved through the sliding friction between the die and the workpiece. Such dies have the following defects: surface damage: the sliding friction causes scratches on the surface of the round steel, resulting in a high scrap rate; springback problem: it is difficult to control the springback angle after bending, and repeated corrections are required; short die life: the frictional force and springback stress are likely to cause cracking or wear of the die; poor adaptability: the fixed concave die is difficult to adapt to the processing requirements of round steel with different diameters. Therefore, it is very important to solve the above problems. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a high-precision bending die with adaptive rollers, which solves the problems in the background art.

[0004] Based on the above purpose, the present invention provides a high-precision bending die with adaptive rollers, which includes a lower die base and an upper die base. In the middle of the top of the lower die base, a concave die is provided. In the middle of the top of the concave die, a groove 1 with openings on both sides is provided. On the left and right sides of the concave die at the top of the lower die base, side blocks that can move horizontally are provided. On the side of the top of the side block close to the groove 1, a groove 2 is provided. The groove 1 and the groove 2 are combined to form a bending groove; on the side of the top of the side block away from the groove 2, an arc-shaped placement groove is provided, and the arc-shaped placement groove is communicated with the groove 2 for placing the workpiece; an adaptive roller mechanism is rotatably provided in the side block at the position of the groove 2; in the middle of the bottom of the upper die base, a convex die is provided, and the convex die is arranged corresponding to the groove 1 up and down.

[0005] Preferably, a working frame is commonly covered outside the concave die and the two side blocks. The concave die is fixed in the working frame, and the two side blocks are located on the left and right sides in the working frame and can move horizontally in the working frame.

[0006] Preferably, sliders are provided on the front and back sides of the side block, and sliding grooves matching the sliders are provided in the working frame.

[0007] Preferably, the side block is rotatably connected to a threaded rod through a bearing. A threaded hole matching the thread is provided in the working frame. The lead of the threaded rod is 2 mm / r, and one end of the threaded rod away from the side block passes through the threaded hole and extends outside the working frame.

[0008] Preferably, a limit head is connected to one end of the threaded rod away from the side block, and a hexagonal screw opening is provided on the side of the limit head.

[0009] Preferably, the adaptive roller mechanism includes a rotating shaft rotatably connected to the second groove. The front and rear ends of the rotating shaft extend into the side blocks to provide a first roller. The first roller is rotatably connected to the side blocks, and the side blocks are provided with notches that fit the rotating shaft and the first roller. A second roller is provided in the middle of the rotating shaft. The second roller is located in the second groove, and one end of the second roller is located at the arc-shaped placement groove. The side blocks are provided with avoidance openings at the arc-shaped placement grooves to avoid the second roller.

[0010] Preferably, all the first rollers and the second rollers are distributed at the same height and their surfaces are plated with a hard alloy layer.

[0011] Preferably, the bottom of the first groove is provided with a bottom groove that matches the size of the workpiece.

[0012] Preferably, a nitrogen spring is provided in the middle of the lower die base below the female die. The elastic coefficient of the nitrogen spring is 30 N / mm. The top of the nitrogen spring is connected to an ejector rod, and the ejector rod can rise and extend into the first groove to eject the formed workpiece.

[0013] The beneficial effects of the present invention: In the present invention, the round steel is placed in the first groove of the female die and the second groove of the side blocks. The two ends of the round steel are located in the arc-shaped placement grooves, and the round steel is placed on the self-adaptive roller mechanism. By moving the upper die base downward to drive the punch downward, the punch contacts and pushes down the middle of the round steel, and the two ends of the round steel contact the second roller in the middle of the self-adaptive roller mechanism, thereby bending. Due to the rolling friction of the symmetric self-adaptive roller mechanisms on both sides, the sliding friction of the traditional die is transformed into rolling friction, achieving precise forming with a friction coefficient ≤ 0.1, reducing the surface roughness of the round steel to Ra ≤ 1.6 μm, while the traditional die has Ra ≥ 4.0 μm, completely eliminating scratch defects, and increasing the finished product rate to over 98%. Moreover, the two side blocks can move horizontally. The side blocks are threadedly connected to the working frame through a rotatably connected threaded rod. In this way, by inserting a hex wrench into the hex screw opening of the limit head, the rotation of the threaded rod can be realized, thereby realizing the movement of the side blocks, and thus adjusting the position of the second groove and the self-adaptive roller mechanism to adapt to the bending of round rods of different lengths. The side blocks are provided with sliders that match the sliding grooves of the working frame, making the adjustment process smooth. The lead of the threaded rod is 2 mm / r, achieving an 80 - 120 mm opening compatibility with a single adjustment ≤ 30 seconds. The self-adaptive roller mechanism is rotatably connected to the side blocks through a rotating shaft and a first roller, contacts the round steel through the second roller, and all the rollers are distributed at the same height and their surfaces are plated with a hard alloy layer. Together with the nitrogen spring with an elastic coefficient of 30 N / mm, the anti-wear life of the die is increased to ≥ 100,000 times. Description of the Drawings

[0014] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 is the overall schematic diagram of the present invention; Figure 2 is the schematic diagram at the lower die base of the present invention; Figure 3 is the schematic diagram of the female die and the side block of the present invention.

[0016] The labels in the figure are: 1 - lower die base, 2 - upper die base, 3 - female die, 4 - first groove, 5 - side block, 6 - second groove, 7 - arc placement groove, 8 - male die, 9 - working frame, 10 - slider, 11 - threaded rod, 12 - threaded hole, 13 - limiting head, 14 - hexagonal screw mouth, 15 - rotating shaft, 16 - first roller, 17 - second roller, 18 - bottom groove, 19 - nitrogen spring, 20 - ejector rod, 21 - chute. Detailed implementation manners

[0017] To make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following further elaborates on the present invention in combination with specific embodiments.

[0018] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not represent any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connecting" or "being connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0019] Such as Figures 1 to 3As shown in the figure, this embodiment provides a high-precision bending die with adaptive rollers, which includes a lower die base 1 and an upper die base 2. In the middle of the top of the lower die base 1, there is a female die 3. In the middle of the top of the female die 3, there is a groove 4 with openings on both sides. At the bottom end of the groove 4, there is a bottom groove 18 that matches the size of the workpiece. On the top of the lower die base 1, on the left and right sides of the female die 3, there are side blocks 5 that can move horizontally. On the top of the side block 5, near one side of the groove 4, there is a groove 2 6. The groove 4 and the groove 2 6 are combined to form a bending groove. On the top of the side block 5, far from the groove 2 6, there is an arc-shaped placement groove 7. The arc-shaped placement groove 7 is connected to the groove 2 6 for placing the workpiece. An adaptive roller mechanism is rotatably arranged in the side block 5 at the position of the groove 2 6. In the middle of the bottom of the upper die base 2, there is a male die 8. The male die 8 is arranged corresponding to the groove 4 up and down. By placing the round steel in the groove 4 of the female die 3 and the groove 2 6 of the side block 5, both ends of the round steel are located in the arc-shaped placement groove 7, and the round steel is placed on the self-adaptive roller mechanism. By moving the upper die base 2 downward to drive the male die 8 downward, the male die 8 contacts and pushes down the middle part of the round steel, and both ends of the round steel contact the roller 2 17 in the middle of the adaptive roller mechanism, so as to bend. Due to the rolling friction of the symmetric self-adaptive roller mechanisms on both sides, the sliding friction of the traditional die is changed into rolling friction, realizing precision forming with a friction coefficient ≤ 0.1, reducing the surface roughness of the round steel to Ra ≤ 1.6μm, while the traditional die has Ra ≥ 4.0μm, completely eliminating scratch defects, and increasing the yield rate to more than 98%. And the two side blocks 5 can move horizontally to adapt to the bending of round steel with different lengths.

[0020] A working frame 9 is commonly covered outside the female die 3 and the two side blocks 5. The female die 3 is fixed in the working frame 9. The two side blocks 5 are located on the left and right sides in the working frame 9 and can move horizontally in the working frame 9. Sliders 10 are arranged on the front and rear sides of the side block 5. In the working frame 9, there are chutes 21 that match the sliders 10. One side of the side block 5 far from the female die 3 is rotatably connected to a threaded rod 11 through a bearing. In the working frame 9, there is a threaded hole 12 that matches the thread. The lead of the threaded rod 11 is 2mm / r. One end of the threaded rod 11 far from the side block 5 passes through the threaded hole 12 and extends outside the working frame 9. A limit head 13 is connected to one end of the threaded rod 11 far from the side block 5. A hexagonal screw port 14 is opened on the side of the limit head 13. The side block 5 is threadedly connected to the working frame 9 through the rotatably connected threaded rod 11. In this way, by inserting a hexagonal wrench into the hexagonal screw port 14 of the limit head 13, the rotation of the threaded rod 11 can be realized, so as to realize the movement of the side block, and thus adjust the position of the groove 2 4 and the adaptive roller mechanism to adapt to the bending of round rods with different lengths. And the side block 5 is provided with sliders 10 that match the chutes 21 of the working frame 9 to make the adjustment process smooth. The lead of the threaded rod 11 is 2mm / r, so as to achieve an 80 - 120mm opening compatibility ability with a single adjustment ≤ 30 seconds.

[0021] The adaptive roller mechanism includes a rotating shaft 15 rotatably connected to the second groove 6. The front and rear ends of the rotating shaft 15 extend into the side block 5 to be provided with a first roller 16. The first roller 16 is rotatably connected to the side block 5. The side block 5 is provided with a notch conforming to the rotating shaft 15 and the first roller 16. A second roller 17 is arranged in the middle of the rotating shaft 15. The second roller 17 is located in the second groove 6. One end of the second roller 17 is located at the arc-shaped placement groove 7. The side block 5 is provided with an avoidance opening for avoiding the second roller 17 at the arc-shaped placement groove 7. All the first rollers 16 and the second rollers 17 are distributed at the same height and the surfaces are plated with a hard alloy layer. The adaptive roller mechanism is rotatably connected to the side block 5 through the rotating shaft 15 and the first roller 16, contacts the round steel through the second roller 17, and all the rollers are distributed at the same height. The surface is plated with a WC-Co series hard alloy layer with a thickness of 0.2 - 0.5 mm. Through the synergistic effect with the nitrogen spring with a spring coefficient of 30 N / mm, the anti-wear life of the mold is increased to ≥ 100,000 times. A nitrogen spring 19 is arranged in the middle below the female mold 3 in the lower mold base 1. The spring coefficient of the nitrogen spring 19 is 30 N / mm. The top of the nitrogen spring 19 is connected with an ejector rod 20. The ejector rod 20 can rise and extend into the first groove 4 to eject the formed workpiece.

[0022] The following table is a comparison table of the technical effects of this embodiment and traditional molds Those of ordinary skill in the art should understand that the discussion of any above embodiment is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail. Any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-precision bending die with an adaptive roller, comprising a lower die base (1) and an upper die base (2), characterized in that, In the middle of the top of the lower die base (1), a female die (3) is provided. In the middle of the top of the female die (3), a first groove (4) with openings on both sides is provided. On the top of the lower die base (1) and on the left and right sides of the female die (3), side blocks (5) that can move horizontally are provided. On the top of the side block (5) and on one side close to the first groove (4), a second groove (6) is provided. The first groove (4) and the second groove (6) are combined to form a bent groove. On the top of the side block (5) and on the side away from the second groove (6), an arc-shaped placement groove (7) is provided. The arc-shaped placement groove (7) communicates with the second groove (6) for placing workpieces. An adaptive roller mechanism is rotatably provided in the side block (5) at the position of the second groove (6). In the middle of the bottom of the upper die base (2), a male die (8) is provided. The male die (8) is arranged corresponding to the first groove (4) up and down.

2. The high-precision bending die with adaptive rollers according to claim 1, characterized in that, A working frame (9) is commonly covered outside the female die (3) and the two side blocks (5). The female die (3) is fixed in the working frame (9). The two side blocks (5) are located on the left and right sides in the working frame (9) and can move horizontally in the working frame (9).

3. The high-precision bending die with an adaptive roller according to claim 2, characterized in that Sliders (10) are provided on the front and rear sides of the side block (5). In the working frame (9), a chute (21) matching the slider (10) is provided.

4. The high-precision bending die with an adaptive roller according to claim 3, wherein On the side of the side block (5) away from the female die (3), a threaded rod (11) is rotatably connected through a bearing. In the working frame (9), a threaded hole (12) matching the thread is provided. The lead of the threaded rod (11) is 2 mm / r. One end of the threaded rod (11) away from the side block (5) passes through the threaded hole (12) and extends outside the working frame (9).

5. The high-precision bending die with adaptive rollers according to claim 4, characterized in that, One end of the threaded rod (11) away from the side block (5) is connected with a limit head (13). A hexagonal screw port (14) is provided on the side of the limit head (13).

6. The high-precision bending die with adaptive rollers according to claim 1, characterized in that, The adaptive roller mechanism includes a rotating shaft (15) rotatably connected at the position of the second groove (6). The front and rear ends of the rotating shaft (15) extend into the side block (5) to be provided with a first roller (16). The first roller (16) is rotatably connected with the side block (5). In the side block (5), a notch matching the rotating shaft (15) and the first roller (16) is provided. A second roller (17) is provided in the middle of the rotating shaft (15). The second roller (17) is located in the second groove (6). One end of the second roller (17) is located at the arc-shaped placement groove (7). On the side block (5) at the position of the arc-shaped placement groove (7), an avoidance opening for avoiding the second roller (17) is provided.

7. The high-precision bending die with adaptive rollers according to claim 6, characterized in that, All the first rollers (16) and the second rollers (17) are distributed at the same height and the surfaces are plated with a hard alloy layer.

8. The high-precision bending die with adaptive rollers according to claim 1, characterized in that, At the bottom end of the first groove (4), a bottom groove (18) matching the size of the workpiece is provided.

9. The high-precision bending die with adaptive rollers according to claim 1, characterized in that A nitrogen spring (19) is provided in the lower die base (1) and in the middle below the female die (3). The elastic coefficient of the nitrogen spring (19) is 30 N / mm. The top of the nitrogen spring (19) is connected with an ejector rod (20). The ejector rod (20) can rise and extend into the first groove (4) to eject the formed workpiece.

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