Metal material roll bending forming unequal thickness avoidance device and avoidance method

Abstract

The application discloses a metal material roll bending forming unequal thickness avoidance device, which comprises an upper roller, a lower roller and an avoidance mechanism, wherein the upper roller and the lower roller are arranged from top to bottom, the lower roller is connected with the output end of the avoidance mechanism, the avoidance mechanism comprises a lower roller oil cylinder, an accumulator and a safety overflow valve group, the lower roller oil cylinder is connected with the lower roller, the accumulator is internally provided with an air bag, the accumulator and the lower roller oil cylinder are connected with a rodless cavity, and the safety overflow valve group is arranged on the accumulator. The application has the advantages of compact and reasonable structure, convenient installation, automatic transition in the case of unequal thickness, reliable operation, more accurate guarantee of product roundness, prevention of upper roller slipping and causing wear on the surface of the upper roller when the unequal thickness product passes through the upper roller and the lower roller, prevention of damage to the roll bending equipment and shortening of the service life.

Description

Technical Field

[0001] This invention relates to the field of metal material processing technology, specifically to a device and method for avoiding uneven thicknesses in metal material roll bending forming. Background Technology

[0002] The four-roll plate bending machine mainly consists of an upper roll, a lower roll, and two side rolls. It can roll metal materials into circles, cones, and squares, and can also correct the roundness of cylindrical, conical, and square cylinders.

[0003] The shortcomings of existing technology:

[0004] When there are uneven thicknesses in the material, such as in the backing plate or weld seam, the bending process becomes obstructed. This can cause the upper roller to slip, resulting in wear on the surface of the upper roller. Roundness correction is also difficult to achieve. If uneven thicknesses, such as weld seams, are forced through, not only will the roundness not be guaranteed, but the bending equipment will also be damaged, shortening its service life. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for avoiding uneven thicknesses in the roll forming of metal materials, so as to solve the problems mentioned in the background art.

[0006] A metal material roll bending forming uneven thickness avoidance device includes an upper roller, a lower roller and an avoidance mechanism, wherein the upper roller and the lower roller are arranged from top to bottom, and the lower roller is connected to the output end of the avoidance mechanism;

[0007] The avoidance mechanism includes:

[0008] Lower roller cylinder, which is connected to the lower roller;

[0009] An accumulator, wherein an air bladder is provided inside the accumulator, and the accumulator is connected to the rodless chamber of the lower roller cylinder;

[0010] A safety relief valve assembly is installed on the accumulator.

[0011] As a further improvement of the present invention, the upper roller is fixedly mounted on the machine tool and connected to an external drive device.

[0012] As a further improvement of the present invention, the rodless chamber of the lower roller cylinder and the accumulator form a closed loop through a pipeline.

[0013] As a further improvement of the present invention, the pipe connecting the accumulator and the lower roller cylinder and the upper end of the lower roller cylinder are both connected to the hydraulic oil system.

[0014] As a further improvement of the present invention, the airbag is filled with an inert gas.

[0015] As a further improvement of the present invention, a limiting mechanism for limiting metal products is provided at the telescopic end of the lower roller oil cylinder, and the limiting mechanism includes:

[0016] A fixed ring, which is arranged at the telescopic end of the lower roller oil cylinder, and linkage rods are arranged on both sides of the fixed ring;

[0017] A transmission bracket, the lower end of the linkage rod is movably connected to the lower end of the transmission bracket, the other end of the transmission bracket is provided with a mounting member, the upper end of the mounting member is provided with a sliding ring, the sliding ring is arranged on the lower roller, and a limiting member is arranged at the upper end of one side of the sliding ring.

[0018] As a further improvement of the present invention, the mounting member includes:

[0019] A connecting plate, one end of the connecting plate is movably connected to the transmission bracket, a connecting rod is slidably connected to the connecting plate through a chute, and the upper end of the connecting rod is connected to the lower end face of the sliding ring;

[0020] A threaded rod, the lower end of the connecting plate is threadedly connected to the threaded rod, and one end of the threaded rod is movably connected to the lower end of the connecting rod.

[0021] As a further improvement of the present invention, the limiting member includes a spring and a limiting block, one end of the spring is arranged on the sliding ring, and the other end of the spring is connected to the limiting block.

[0022] The present invention also discloses a avoidance method for an unequal-thickness avoidance device for roll bending forming of metal materials. This avoidance method includes the following steps: a. Initial operation; b. Avoidance operation; c. Reset operation, where:

[0023] a. Initial operation: During the initial operation, the pressure P1 in the rodless cavity of the lower roller oil cylinder, the height h1, the pressure P2 of the accumulator, and the pressure P0 of the airbag. Since the accumulator is connected to the rodless cavity of the lower roller oil cylinder, according to Pascal's principle, at this time P1 = P2 = P0. The lower roller oil cylinder pushes the lower roller to rise, the upper roller and the lower roller clamp the coiled plate workpiece, and the upper roller rotates as the main drive under the drive of the motor;

[0024] b. Avoidance operation: When the product thickness increases and the gap between the upper roller and the lower roller needs to become larger, since the position of the upper roller is fixed, the upper roller rotates under the drive of the motor and compresses the lower roller oil cylinder to move downward. Since the hydraulic oil is incompressible, and the internal gas pressure P0 of the airbag can be compressed in a short time. According to Pascal's principle, at the moment of passing through the seam, P1 = P2 < P0. The displacement height h2 of the piston of the lower roller oil cylinder, h2 < h1;

[0025] c. Reset and operation: After the thickness position passes between the upper roller and the lower roller, since P1 = P2 < P0, the hydraulic oil flows back to the rodless cavity of the lower roller cylinder, and the distance gap between the upper roller and the lower roller returns to the normal value. According to Pascal's principle, at this time, P1 = P2 = P0. At this time, the height of the rodless cavity of the lower roller cylinder is h3, h3 = h1 > h2, and the normal working condition of plate rolling or roundness correction is restored.

[0026] As a further improvement of the present invention, when the internal pressure of the accumulator is too high, the oil can be discharged and the pressure can be relieved through the safety overflow valve group in this method.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. By setting an avoidance mechanism in the present invention, the lower roller is connected to the output end of the avoidance mechanism. The avoidance mechanism includes a lower roller cylinder, an accumulator, and a safety overflow valve group. In the case of unequal thickness, it can automatically transition, operate reliably, ensure more accurate roundness of the product, prevent the upper roller from slipping when the unequal thickness product passes through the upper roller and the lower roller, causing wear to the surface of the upper roller, and prevent damage to the rolling equipment and shorten its service life. At the same time, combined with the avoidance method of the present invention, before processing, according to the thickness of the product, an appropriate amount of oil can be injected into or discharged from the rodless cavity of the lower roller cylinder, so as to adjust the distance between the upper roller and the lower roller, and it can be adapted to process products of different thicknesses;

[0029] 2. By installing a limiting mechanism for limiting the metal material at the telescopic end of the lower roller cylinder in the present invention, the limiting mechanism includes a fixed ring and a transmission bracket, which can limit the two sides of the product during the avoidance process, prevent the hydraulic oil of the lower roller cylinder from冲入 the accumulator, and cause the gap between the upper roller and the lower roller to become larger, resulting in the displacement of the product position. At the same time, when the thicker position passes, it is reset again;

[0030] 3. By setting an installation part in the present invention, the installation part includes a connecting plate and a threaded rod. By adjusting the position of the connecting rod through the threaded rod, the distance between the sliding rings can be adjusted, ensuring that the limiting distance of the limiting mechanism can adapt to the actual length of the product;

[0031] 4. By setting a limiting part in the present invention, the limiting part includes a spring and a limiting block. When limiting the two ends of the product, the spring and the limiting block are used to limit the product through the sliding ring. The longer the displacement distance of the telescopic end of the lower roller cylinder, the greater the compression degree of the spring, and the greater the pressure on the product by the limiting block, which can adaptively adjust the limiting pressure according to the product thickness. Brief Description of the Drawings

[0032] Figure 1 It is an overall schematic diagram of an unequal - thickness avoidance device for metal material roll - bending forming of the present invention;

[0033] Figure 2 This is a schematic diagram of the initial operation of a metal material roll bending forming uneven thickness avoidance device according to the present invention;

[0034] Figure 3 This is a schematic diagram of the obstacle avoidance operation of a metal material roll bending forming uneven thickness obstacle avoidance device according to the present invention;

[0035] Figure 4 This is a schematic diagram of the reset operation of a metal material roll bending forming uneven thickness avoidance device according to the present invention;

[0036] Figure 5 This is a schematic diagram of the installation of the limiting mechanism of the uneven thickness avoidance device for rolling and forming metal materials according to the present invention.

[0037] Figure 6 This is a flowchart of the obstacle avoidance method of an uneven thickness avoidance device for rolling and forming metal materials according to the present invention.

[0038] In the diagram: 1. Upper roller; 2. Lower roller; 3. Avoidance mechanism; 31. Lower roller cylinder; 32. Accumulator; 33. Airbag; 34. Safety overflow valve assembly; 4. Limiting mechanism; 41. Fixed ring; 42. Linkage rod; 43. Transmission bracket; 44. Sliding ring; 45. Connecting plate; 46. Connecting rod; 47. Threaded rod; 48. Spring; 49. Limiting block. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] Please see Figure 1-5The present invention provides the following technical solution: a metal material roll forming uneven thickness avoidance device, including an upper roller 1, a lower roller 2, and an avoidance mechanism 3. The upper roller 1 and the lower roller 2 are mounted on a machine tool from top to bottom. The lower roller 2 is connected to the output end of the avoidance mechanism 3. The avoidance mechanism 3 includes a lower roller cylinder 31, an accumulator 32, and a safety relief valve group 34. The upper end of the lower roller cylinder 31 is rotatably connected to both ends of the lower roller 2 through a mounting bearing seat. An air bladder 33 is installed inside the accumulator 32. The rodless chamber of the accumulator 32 and the lower roller cylinder 31 are connected through a conduit. The safety relief valve group 34 is installed on the accumulator 32. When the product thickness increases, the gap between the upper roller 1 and the lower roller 2 needs to increase. Since the position of the upper roller 1 is fixed, the lower roller cylinder 31 moves downward. Since the hydraulic oil is incompressible, the lower roller... The oil inside the rodless chamber of cylinder 31 is squeezed into accumulator 32, increasing the pressure inside airbag 33. After passing through the thickness position, the pressure in airbag 33 is relatively high, causing hydraulic oil to flow back into the rodless chamber of lower roller cylinder 31, allowing lower roller 2 to return to its initial position. This effectively avoids the processed product. At the same time, if the product is thick and the pressure inside accumulator 32 and lower roller cylinder 31 becomes too high during processing, an appropriate amount of oil can be discharged through safety relief valve assembly 34 to ensure safety during the avoidance process. Furthermore, before processing, an appropriate amount of oil can be injected or discharged into the rodless chamber of lower roller cylinder 31 according to the product thickness, thereby adjusting the distance between upper roller 1 and lower roller 2, which can adapt to the processing of products of different thicknesses.

[0042] The upper roller 1 is fixedly mounted on the machine tool and connected to an external drive device, which facilitates the fixation of the upper roller 1 during operation and can drive the upper roller 1 to rotate.

[0043] The rodless chamber of the lower roller cylinder 31 and the accumulator 32 form a closed loop through a pipeline, ensuring that the lower roller cylinder 31 can stably support the lower roller 2 under normal conditions, and that the lower roller 2 can quickly reset after the product thickness returns to normal.

[0044] The pipe connecting the accumulator 32 to the lower roller cylinder 31 and the upper end of the lower roller cylinder 31 are both connected to the hydraulic oil system, which facilitates the injection or replacement of hydraulic oil.

[0045] The airbag 33 is filled with an inert gas, and the inert gas is nitrogen.

[0046] The telescopic end of the lower roller cylinder 31 is equipped with a limiting mechanism 4 for limiting the metal material. The limiting mechanism 4 includes a fixed ring 41 and a transmission bracket 43. The fixed ring 41 is fixedly installed at the telescopic end of the lower roller cylinder 31. A linkage rod 42 is welded to both sides of the fixed ring 41. The lower end of the linkage rod 42 is connected to the lower end of the transmission bracket 43 by a pin. An installation part is installed at the other end of the transmission bracket 43. A sliding ring 44 is installed on the upper end of the installation part. The sliding ring 44 is sleeved on the lower roller 2. The upper side of the sliding ring 44... The end is equipped with a limiting component. During use, when the product thickness increases, the fixing ring 41 descends with the telescopic end of the lower roller cylinder 31. Through the linkage rod 42, the transmission bracket 43 retracts, thereby driving the sliding ring 44 on the lower roller 2 to move the limiting component closer to one side of the product. This limits the product on both sides, preventing the gap between the upper roller 1 and the lower roller 2 from widening and causing the product position to shift when the hydraulic oil of the lower roller cylinder 31 rushes into the accumulator 32. At the same time, it resets again after the thicker part has passed.

[0047] The mounting components include a connecting plate 45 and a threaded rod 47. One end of the connecting plate 45 is connected to the transmission bracket 43 via a pin. A connecting rod 46 is slidably connected to the connecting plate 45 via a groove. The upper end of the connecting rod 46 is connected to the lower end face of the sliding ring 44. The lower end of the connecting plate 45 is threadedly connected to the threaded rod 47. One end of the threaded rod 47 is connected to the lower end of the connecting rod 46 via a bearing. During use, the threaded rod 47 can be rotated according to the length of the product to adjust the position of the connecting rod 46, thereby adjusting the distance between the sliding rings 44 and ensuring that the limiting distance of the limiting mechanism 4 is adapted to the actual length of the product.

[0048] The limiting component includes a spring 48 and a limiting block 49. One end of the spring 48 is mounted on the sliding ring 44, and the other end of the spring 48 is connected to the limiting block 49. When limiting the product at both ends, the sliding ring 44 drives the spring 48 and the limiting block 49 to limit the product. The longer the displacement of the extension end of the lower roller cylinder 31, the greater the compression of the spring 48, and the greater the pressure on the product through the limiting block 49. The limiting pressure can be adjusted according to the product thickness.

[0049] Example 2

[0050] Please see Figure 6 The present invention provides the following technical solution: a method for avoiding uneven thicknesses in a metal material roll bending forming device, the method comprising the following steps:

[0051] a. Initial operation: During the initial operation, the pressure in the rodless cavity of the lower roll cylinder 31 is P1, the height is h1, the pressure of the accumulator 32 is P2, and the pressure of the airbag 33 is P0. Since the accumulator 32 is connected to the rodless cavity of the lower roll cylinder 31, according to Pascal's principle, at this time P1 = P2 = P0. The lower roll cylinder 31 pushes the lower roll 2 to rise, and the upper roll 1 and the lower roll 2 clamp the rolled plate workpiece. The upper roll 1 rotates for the main drive under the drive of the motor;

[0052] b. Avoidance operation: When the product thickness increases and the gap between the upper roll 1 and the lower roll 2 needs to become larger, since the position of the upper roll 1 is fixed, the upper roll 1 rotates under the drive of the motor and compresses the lower roll cylinder 31 to move downward. Since the hydraulic oil is incompressible, while the internal gas pressure P0 of the airbag 33 can be compressed in a short time. According to Pascal's principle, at the moment of passing through the seam, P1 = P2 < P0, and the height after the displacement of the piston of the lower roll cylinder 31 is h2, h2 < h1;

[0053] c. Reset operation: After the thickness position passes between the upper roll 1 and the lower roll 2, due to P1 = P2 < P0, the hydraulic oil flows back to the rodless cavity of the lower roll cylinder 31, and the distance gap between the upper roll 1 and the lower roll 2 returns to the normal value. According to Pascal's principle, at this time P1 = P2 = P0. At this time, the height of the rodless cavity of the lower roll cylinder 31 is h3, h3 = h1 > h2, and the normal working condition of rolling the plate or roundness correction is restored;

[0054] At the same time, when the thickness of the product is too large, resulting in excessive internal pressure in the accumulator 32, the safety overflow valve group 34 can be used to drain oil and relieve pressure to ensure the stability of the pressure, and at the same time ensure that the thicker position of the product can pass effectively.

[0055] In this invention, before processing, an appropriate amount of oil can be injected or discharged into the rodless chamber of the lower roller cylinder 31 according to the product thickness, thereby adjusting the distance between the upper roller 1 and the lower roller 2. This allows for processing of products with different thicknesses. When the product thickness increases, the gap between the upper roller 1 and the lower roller 2 needs to increase. Since the upper roller 1 is fixed in position, the lower roller cylinder 31 moves downward. Because hydraulic oil is incompressible, the oil inside the rodless chamber of the lower roller cylinder 31 is squeezed into the accumulator 32, increasing the pressure inside the air bladder 33. After passing the thickness mark, the pressure in the air bladder 33 is high, causing the hydraulic oil to flow back into the rodless chamber of the lower roller cylinder 31, restoring the lower roller 2 to its initial position. This effectively controls the processing... When the product is being processed, it avoids obstacles. If the product is too thick during processing, causing excessive pressure inside the accumulator 32 and the lower roller cylinder 31, a suitable amount of oil can be discharged through the safety overflow valve group 34 to ensure safety during the avoidance process. At the same time, as the product thickness increases, the fixing ring 41 descends with the telescopic end of the lower roller cylinder 31, and drives the transmission bracket 43 to retract through the linkage rod 42. This causes the sliding ring 44 to move the limiting component on the lower roller 2 towards one side of the product, thereby limiting the product on both sides. This prevents the gap between the upper roller 1 and the lower roller 2 from widening and causing the product position to shift when the hydraulic oil of the lower roller cylinder 31 rushes into the accumulator 32. At the same time, the product is reset again after the thicker part has passed.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal material roll-bending forming unequal thickness avoidance device comprising an upper roller, a lower roller and an avoidance mechanism, characterized in that: The upper roller and the lower roller are arranged from top to bottom, and the lower roller is connected to the output end of the avoidance mechanism; The avoidance mechanism includes: A lower roller oil cylinder, which is connected to the lower roller; An accumulator, inside which there is an airbag, and the accumulator is connected to the rodless cavity of the lower roller oil cylinder; A safety overflow valve group, which is arranged on the accumulator; A limiting mechanism for limiting metal products is arranged at the telescopic end of the lower roller oil cylinder, and the limiting mechanism includes: A fixed ring, which is arranged at the telescopic end of the lower roller oil cylinder, and linkage rods are arranged on both sides of the fixed ring; A transmission bracket, the lower end of the linkage rod is movably connected to the lower end of the transmission bracket, the other end of the transmission bracket is provided with a mounting part, the upper end of the mounting part is provided with a sliding ring, the sliding ring is arranged on the lower roller, and a limiting part is arranged at the upper end of one side of the sliding ring; The mounting part includes: A connecting plate, one end of the connecting plate is movably connected to the transmission bracket, a connecting rod is slidably connected to the connecting plate through a chute, and the upper end of the connecting rod is connected to the lower end surface of the sliding ring; A threaded rod, the lower end of the connecting plate is threadedly connected to the threaded rod, and one end of the threaded rod is movably connected to the lower end of the connecting rod; The limiting part includes a spring and a limiting block, one end of the spring is arranged on the sliding ring, and the other end of the spring is connected to the limiting block.

2. The metal material roll-bending forming unequal thickness relief device according to claim 1, characterized in that: The upper roller is fixedly arranged on the machine tool and is connected to an external driving device.

3. The metal material roll-bending forming unequal thickness relief device according to claim 1, characterized in that: A closed loop is formed between the rodless cavity of the lower roller oil cylinder and the accumulator through a pipeline.

4. The metal material roll-bending forming unequal thickness relief device according to claim 1, characterized in that: Both the pipeline connecting the accumulator and the lower roller oil cylinder and the upper end of the lower roller oil cylinder are connected to the hydraulic oil system.

5. The metal material roll-bending forming unequal thickness relief of claim 1, wherein: The inside of the airbag is filled with inert gas.

6. A method of allowing a metal material to roll bend according to any one of claims 1 to 5, wherein: This avoidance method includes the following steps: a. Initial operation; b. Avoidance operation; c. Reset operation, where: a. Initial operation: During the initial operation, the pressure P1 in the rodless cavity of the lower roller oil cylinder, the height h1, the pressure P2 of the accumulator, and the pressure P0 of the airbag. Since the accumulator is connected to the rodless cavity of the lower roller oil cylinder, according to Pascal's principle, at this time P1 = P2 = P0. The lower roller oil cylinder pushes the lower roller to rise, the upper roller and the lower roller clamp the coiled plate workpiece, and the upper roller rotates for main transmission under the drive of the motor; b. Avoidance operation: When the product thickness increases and the gap between the upper roller and the lower roller needs to become larger, since the position of the upper roller is fixed, the upper roller rotates under the drive of the motor, compressing the lower roller oil cylinder to move downward. Since the hydraulic oil is incompressible, while the gas pressure P0 inside the airbag can be compressed in a short time. According to Pascal's principle, at the moment of passing through the gap, P1 = P2 < P0, and the height h2 after the displacement of the piston of the lower roller oil cylinder, h2 < h1; c. Reset operation: After the thickness position passes between the upper roller and the lower roller, due to P1 = P2 < P0, the hydraulic oil flows back to the rodless cavity of the lower roller oil cylinder, and the distance gap between the upper roller and the lower roller returns to the normal value. According to Pascal's principle, at this time P1 = P2 = P0. At this time, the height of the rodless cavity of the lower roller oil cylinder is h3, h3 = h1 > h2, and the normal working condition of coiling or roundness correction is restored.

7. The method of claim 6, wherein: When the internal pressure of the accumulator described in this method is too high, the pressure can be relieved by draining oil through the safety relief valve assembly.

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