A motorcycle frame pipe bending forming device

Abstract

The application discloses a motorcycle frame pipe bending forming processing device and belongs to the field of motorcycle accessory processing. The device comprises a pipe bending machine main body, a conveying unit for pushing a pipe bending raw material is arranged on the pipe bending machine main body, a main bending die is fixedly arranged on the pipe bending machine main body, a vice bending die is further arranged on the pipe bending machine main body, a driving unit is fixedly arranged on the pipe bending machine main body, and the driving unit is used for rotating the vice bending die to cooperate with the main bending die and bending the pipe bending raw material. Two groups of clamping blocks symmetrically arranged upwards and downwards are used for applying a vertical constraint force on a pipe material section, so that the pipe wall is always closely attached to the circular perforated surface of the main bending die in the bending process. The rigid circular profile of the die perforation is used for forming complete constraint on the pipe material section, the tendency of the pipe material to be inwardly recessed in the vertical direction during bending is effectively resisted, the roundness of the pipe material section is maintained, and thus the pipe bending forming precision and structural strength are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of motorcycle parts processing, and more specifically, to motorcycle frame forming processing technology. Background Technology

[0002] Tube bending and forming is a core process in motorcycle frame manufacturing. As the load-bearing skeleton of the entire vehicle, the motorcycle frame needs to be formed into a complex three-dimensional spatial structure by bending straight hollow steel tubes to accurately connect multiple key parts such as the head tube, engine suspension point, rear swingarm pivot, and seat mounting position. Compared with the multi-section straight tube welding structure, the tube bending and forming technology can significantly reduce the number of welds and improve the overall rigidity and fatigue strength of the frame. Therefore, it has been widely used in modern motorcycle manufacturing. However, when processing chassis tubing, the clamping force of existing pipe bending machines mainly comes from the horizontally arranged clamping die and bending die to clamp the pipe. However, during the bending process, the stress state of the pipe cross section is not limited to the horizontal direction. When the pipe is bent, the outer material of the bent part is subjected to tangential tensile stress, and the inner material is subjected to tangential compressive stress. These two opposite tangential stresses generate a resultant force component pointing inward on the cross section of the pipe. According to the Poisson effect, the outer tension area tends to contract in the circumferential direction, and the inner compression area tends to expand in the circumferential direction. The two work together to make the circular cross section attempt to contract and deform in the direction perpendicular to the bending plane (i.e., the vertical direction). Some existing pipe bending machines, due to the horizontal clamping of the clamping and bending mold, can only constrain the horizontal displacement and sliding of the pipe. For the vertical cross-sectional expansion caused by tensile and compressive stress during the bending process, this part of the pipe is in an unconstrained or weakly constrained state, which will directly lead to excessive stress on the cross-section of the pipe bending section, causing the upper and lower ends of the bend to dent inward. For thin-walled pipe components such as motorcycle frames, this not only weakens the bending resistance and structural strength of the bend section, but also affects the subsequent welding positioning accuracy and the overall vehicle assembly quality. Therefore, relying solely on horizontal clamping force is insufficient to effectively control the cross-sectional deformation during pipe bending. It is urgent to add auxiliary clamping force in the vertical direction to constrain the pipe cross-section from the vertical direction, resist the cross-sectional expansion tendency generated during bending, thereby maintaining the roundness of the pipe cross-section and ensuring the quality of pipe bending. Summary of the Invention

[0003] In view of the problems existing in the prior art, the purpose of this invention is to provide a motorcycle frame bending and forming processing device.

[0004] To solve the above problems, the present invention adopts the following technical solution: A motorcycle frame bending forming processing device includes a bending machine body, a conveying unit for pushing bending raw materials on the bending machine body, a main bending die fixedly mounted on the bending machine body, a secondary bending die also mounted on the bending machine body, and a drive unit fixedly mounted on the bending machine body. The drive unit is used to rotate the secondary bending die to cooperate with the main bending die and bend the bending raw materials. A stress relief component is mounted on the main bending die, and the stress relief component is in flexible contact with the bending raw materials. The stress relief component includes clamping blocks elastically connected to the main bending die. Two sets of clamping blocks are provided, and the two sets of clamping blocks are arranged symmetrically at the top and bottom. Through holes are left between the two sets of clamping blocks and the main bending die and the secondary bending die for the bending raw materials to pass through.

[0005] Optionally, two sets of main limiting blocks are slidably arranged on the main bending mold. The two sets of main limiting blocks are designed symmetrically from top to bottom. Each main limiting block is fixedly connected to the airbag body. The end of the airbag body away from the main limiting block is fixedly connected to the clamping block. A first thrust spring is fixedly arranged inside the airbag body.

[0006] Optionally, a gap is left between the two sets of main limiting blocks and the main bending die. Two sets of secondary limiting blocks are fixedly installed on the secondary bending die. The two sets of secondary limiting blocks are used in conjunction with the two sets of main limiting blocks. The two sets of secondary limiting blocks are used to insert into the gap between the main limiting blocks and the main bending die. The edges of the two sets of main limiting blocks and the two sets of secondary limiting blocks that are close to each other are designed with rounded corners.

[0007] Optionally, both sets of main limit blocks have rounded corners on their sides.

[0008] Optionally, an oiling component is fixedly installed on the main bending die. The oiling component is used to apply lubricating oil to the inside of the perforation. The oiling component includes an outer sleeve fixedly installed on the outer surface of the main bending die. An oiling bend is slidably and sealed inside the outer sleeve. An oiling sleeve is rotatably installed on the oiling bend. The oiling sleeve is used in conjunction with the perforation.

[0009] Optionally, the end of the oiling sleeve is designed to be semi-circular, and a thin sponge is attached to the outer surface of the oiling sleeve, with a ring-shaped protrusion between the thin sponge and the end of the oiling sleeve.

[0010] Optionally, the oiling sleeve and the oiling bend are hollowed out and connected internally. The oiling sleeve is provided with multiple sets of air inlets at one end inside the outer sleeve. An automatic jetting component is provided inside the outer sleeve to deliver gas into the oiling sleeve. A ring of jetting holes is provided at equal intervals around the end of the oiling sleeve.

[0011] Optionally, the automatic jetting assembly includes a bent rod fixedly connected to the outer surface of the oiling bend, one end of the bent rod being fixedly connected to the end of the oiling bend away from the oiling sleeve, and the other end of the bent rod being fixedly connected to a ring plate. A second thrust spring is provided inside the outer sleeve, one end of the second thrust spring being fixedly connected to the inner wall of the outer sleeve, and the other end of the second thrust spring being fixedly connected to the ring plate. A bellows is fixedly sleeved on the outer surface of the bent rod, the end of the bellows near the oiling sleeve being fixedly connected to the inner wall of the outer sleeve, and the end of the bellows away from the oiling sleeve being fixedly connected to the ring plate.

[0012] Optionally, the outer sleeve has a reserved cavity inside, which is the space between the corrugated pipe and the oiled sleeve. The corrugated pipe contracts to inject gas into the oiled sleeve. The size of the corrugated pipe and the size of the annular plate are both smaller than the size of the inner wall of the outer sleeve. The end of the outer sleeve away from the oiled sleeve is connected to the outside.

[0013] Optionally, a first check valve is provided at the end of the bellows near the second thrust spring. The first check valve is used to send the gas inside the outer sleeve into the bellows. A second check valve is provided at the end of the bellows near the oiled sleeve. The second check valve is used to discharge the gas inside the bellows. The jet hole is designed to be inclined.

[0014] Compared with the prior art, the technical solution provided by this invention has at least the following beneficial effects: In the above scheme, two sets of clamping blocks symmetrically arranged at the top and bottom apply vertical constraint force to the pipe cross-section, so that the pipe wall always adheres tightly to the circular perforation surface of the main bending die during the bending process. The rigid circular contour of the die perforation forms a complete constraint on the pipe cross-section, effectively resisting the tendency of the pipe to bend inward in the vertical direction during bending, maintaining the roundness of the pipe cross-section, and thus ensuring the bending forming accuracy and structural strength.

[0015] By setting up an insertion fit between the secondary limit block and the primary limit block, and a rounded corner guide structure, the clamping force is adaptively varied with the bending process. At the beginning of the bending, the secondary limit block inserts into the gap, pushing the primary limit block to slide outward, increasing the clamping force to ensure that the pipe is firmly clamped and prevent slippage. In the middle of the bending, the rounded edge of the secondary limit block slides along the rounded surface of the primary limit block, and the clamping force gradually decreases, reducing the sliding friction resistance between the pipe and the mold, and reducing the risk of thinning of the outer wall thickness and cracking. At the end of the bending, the secondary limit block disengages from the primary limit block, the clamping force returns to zero, and the pipe enters a free stress release state, which is conducive to the natural release of internal residual stress and rebound stability.

[0016] By setting the air jet action of the oiling component before the annular protrusion scraping action, high-pressure gas first impacts the inner wall surface of the perforation, disrupting the integrity and continuity of the residual oil film and tearing it into multiple dispersed areas. This significantly reduces the adhesion of the oil film to metal debris. Subsequently, when the annular protrusion scrapes, it only needs to overcome the residual adhesion of the dispersed oil film to scrape off the oil film along with the metal debris. The scraping effect is more thorough, effectively reducing the problem of debris being difficult to remove due to the viscoelasticity of the oil film rolling and pushing with the oil film. This ensures the cleanliness of the mold cavity surface and provides clean lubrication conditions for the next bending process. Attached Figure Description

[0017] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structural assembly of the main bending die, the secondary bending die, the stress relief component, and the oiling component of the present invention. Figure 3 This is a schematic diagram of the structural combination of the main bending die, the secondary bending die, and the stress relief assembly of the present invention. Figure 4 Exploded view of the main bending die, secondary bending die, and stress relief assembly of the present invention; Figure 5 This is a front structural diagram of the bending die, sub-bending die, stress relief assembly, and oiling assembly of the present invention; Figure 6 This is a schematic diagram of the back structure of the bending die, sub-bending die, stress relief assembly, and oiling assembly of the present invention; Figure 7 This is a schematic diagram of the oiling assembly of the present invention; Figure 8 This is a cross-sectional view of the internal structure of the oiling assembly and automatic jetting assembly of the present invention.

[0019] [Figure Labels] 1. Pipe bending machine body; 2. Main bending die; 3. Secondary bending die; 4. Stress relief assembly; 5. Oiling assembly; 6. Automatic air jet assembly; 11. Conveying unit; 12. Drive unit; 41. Clamping block; 42. Airbag body; 43. Main limiting block; 44. Secondary limiting block; 45. First thrust spring; 51. Outer tube; 52. Oiled bending pipe; 53. Oiled sleeve; 54. Air inlet; 55. Air jet hole; 61. Bending rod; 62. Ring plate; 63. Second thrust spring; 64. Bellows; 65. Reserved cavity; 66. First check valve; 67. Second check valve.

[0020] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0022] like Figures 1 to 8 As shown, this embodiment of the invention provides a motorcycle frame bending forming processing device, including a bending machine body 1. The bending machine body 1 is provided with a conveying unit 11 for pushing the bending raw material. A main bending die 2 is fixedly provided on the bending machine body 1. A secondary bending die 3 is also provided on the bending machine body 1. A drive unit 12 is fixedly provided on the bending machine body 1. The drive unit 12 is used to rotate the secondary bending die 3 to cooperate with the main bending die 2 and bend the bending raw material. A stress relief component 4 is provided on the main bending die 2. The stress relief component 4 is in flexible contact with the bending raw material. The stress relief component 4 includes a clamping block 41 elastically connected to the main bending die 2. Two sets of clamping blocks 41 are provided, and the two sets of clamping blocks 41 are arranged symmetrically up and down. Through holes are left between the two sets of clamping blocks 41 and the main bending die 2 and the secondary bending die 3 for the bending raw material to pass through.

[0023] After the pipe bending machine is started, the conveying unit 11 pushes the pipe material axially, allowing the pipe to pass through the through hole formed between the main bending die 2 and the secondary bending die 3, as well as between the two sets of symmetrically arranged clamping blocks 41 and the die body, reaching the preset bending start position. The two sets of clamping blocks 41 are symmetrically arranged on the main bending die 2. When the pipe is in place, the clamping blocks 41, through the action of elastic connectors, form flexible contact with the outer wall of the pipe from both the top and bottom directions, so that the pipe is clamped and positioned in the through hole of the main bending die 2. The driving unit 12 drives the secondary bending die 3 to rotate. The secondary bending die 3 cooperates with the main bending die 2 to apply a bending torque to the pipe, causing the pipe to undergo plastic bending deformation. During the bending process, the two sets of clamping blocks 41 always clamp the pipe from both the top and bottom directions. The outer wall of the pipe is subjected to a vertical constraint force on the pipe cross-section. This constraint force keeps the pipe wall in close contact with the circular perforation surface of the main bending die 2. The rigid circular contour of the die perforation forms a complete constraint on the pipe cross-section, resisting the elliptical tendency of the pipe to bend inward in the vertical direction during bending, thereby maintaining the roundness of the pipe cross-section. The soft rubber attached to the surface of the clamping block 41 is in direct contact with the outer wall of the pipe during the clamping process. The softness and elasticity of the rubber material are used to distribute the clamping force evenly on the outer wall surface of the pipe, avoiding local stress concentration and preventing indentations or scratches on the pipe surface. After bending to the preset angle, the drive unit 12 stops, the bending is completed, and the clamping block 41 releases the clamp on the pipe under the action of the elastic connector. The pipe is taken out, and one bending processing cycle ends. It should be noted that the clamping block 41 has a soft rubber attached to the side facing the pipe.

[0024] Two sets of main limiting blocks 43 are slidably arranged on the main bending mold 2. The two sets of main limiting blocks 43 are designed symmetrically from top to bottom. Each main limiting block 43 is fixedly connected to the airbag body 42. The end of the airbag body 42 away from the main limiting block 43 is fixedly connected to the clamping block 41. A first thrust spring 45 is fixedly arranged inside the airbag body 42.

[0025] When the clamping block 41 contacts the outer wall of the pipe and bears the reaction force, the reaction force is transmitted to the airbag body 42 through the clamping block 41. The airbag body 42 is filled with compressed gas, which undergoes compression deformation under the action of external force. The internal air pressure increases with the increase of compression, thereby applying a reverse elastic support force to the clamping block 41. The first thrust spring 45 is fixedly installed inside the airbag body 42. When the airbag body 42 is compressed, it generates elastic compression simultaneously, applying an auxiliary elastic restoring force to the clamping block 41. Thus, the airbag body 42 provides basic elastic support force, and the first thrust spring 45 provides auxiliary elastic restoring force. The two work together to enable the clamping block 41 to adaptively adjust its position according to the slight deformation of the pipe during bending, while maintaining continuous flexible contact with the outer wall of the pipe.

[0026] There is a gap between the two sets of main limiting blocks 43 and the main bending mold 2. Two sets of secondary limiting blocks 44 are fixedly installed on the secondary bending mold 3. The two sets of secondary limiting blocks 44 are used in conjunction with the two sets of main limiting blocks 43 respectively. The two sets of secondary limiting blocks 44 are used to insert into the gap between the main limiting blocks 43 and the main bending mold 2. The edges of the two sets of main limiting blocks 43 and the two sets of secondary limiting blocks 44 that are close to each other are designed with rounded corners.

[0027] Before bending begins, the secondary bending mold 3 is in its initial position, and the secondary limiting block 44 and the main limiting block 43 are separated. First, the drive unit 12 moves the secondary bending mold 3 closer to the main bending mold 2, and the two close. The two sets of secondary limiting blocks 44 move synchronously with the secondary bending mold 3, respectively inserting into the gaps between the corresponding main limiting blocks 43 and the main bending mold 2. After the secondary limiting blocks 44 are inserted into the gaps, they apply a thrust to the main limiting blocks 43 in a direction away from the main bending mold 2, pushing the main limiting blocks 43 to slide outward along the main bending mold 2. When the main limiting blocks 43 slide outward, the airbag body 42 and the second... A thrust spring 45 drives the clamping block 41 to move synchronously towards the pipe, thereby increasing the clamping force of the clamping block 41 on the outer wall of the pipe and improving the friction between the clamping block 41 and the pipe. This effectively prevents the pipe from shifting or slipping during bending. The edges of the two sets of main limiting blocks 43 and the two sets of secondary limiting blocks 44 that are close to each other are all designed with rounded corners. This rounded corner structure allows the rounded corner edge of the secondary limiting block 44 to form a smooth guiding fit with the rounded corner edge of the main limiting block 43 during the insertion of the secondary limiting block 44 into the gap, avoiding hard collisions and jamming, and ensuring that the secondary limiting block 44 can be smoothly inserted into the gap.

[0028] Both sets of main limiting blocks 43 have rounded corners on their sides.

[0029] As the secondary bending die 3 gradually approaches the main bending die 2 during the bending process, the secondary limiting block 44 gradually inserts into the gap between the main limiting block 43 and the main bending die 2. As the secondary limiting block 44 gradually goes deeper, the main limiting block 43 is pushed outward and slides. The clamping force of the clamping block 41 on the pipe increases accordingly. At this time, it is in the initial stage of bending, and the clamping force is the greatest, ensuring that the pipe is firmly clamped and positioned to prevent slippage. When the secondary limiting block 44 is inserted to the position where its rounded edge begins to contact the rounded edge of the main limiting block 43, as the secondary bending die 3 continues to rotate, the secondary limiting block 44 slides along the rounded surface of the main limiting block 43. At this stage, due to the guiding effect of the rounded surface, the pushing force of the secondary limiting block 44 on the main limiting block 43 gradually decreases, the outward sliding speed of the main limiting block 43 slows down, and the clamping force of the clamping block 41 on the pipe gradually decreases accordingly. At this time, the bending enters the middle section, and the pipe has begun to undergo plastic bending. Appropriately reducing the clamping force helps to reduce the sliding friction resistance between the pipe and the die, and reduce the risk of thinning of the outer wall thickness. When the secondary limit block 44 completely crosses the rounded corner area of ​​the main limit block 43 and the two no longer contact each other, the pushing force of the secondary limit block 44 on the main limit block 43 returns to zero, the main limit block 43 loses external thrust, and the clamping force of the clamping block 41 on the pipe is reduced to the minimum. At this time, the bending is close to or has been completed, and the pipe is in a relatively free stress release state, which is conducive to the natural release of internal residual stress and rebound stability. Thus, by changing the contact state of the rounded corners of the secondary limiting block 44 and the main limiting block 43, the clamping force changes from maximum to zero throughout the bending process, corresponding to three different stages: firm clamping at the beginning of bending, moderate pressure reduction in the middle of bending, and stress release at the end of bending.

[0030] An oiling component 5 is fixedly installed on the main bending die 2. The oiling component 5 is used to apply lubricating oil to the inside of the perforation. The oiling component 5 includes an outer sleeve 51 fixedly installed on the outer surface of the main bending die 2. An oiling bend 52 is slidably and sealed inside the outer sleeve 51. An oiling sleeve 53 is rotatably installed on the oiling bend 52. The oiling sleeve 53 is used in conjunction with the perforation.

[0031] The end of the oiling sleeve 53 is designed in a semi-circular shape. A thin sponge is attached to the outer surface of the oiling sleeve 53, and there is a ring-shaped protrusion between the thin sponge and the end of the oiling sleeve 53.

[0032] The oiling sleeve 53 and the oiling bend 52 are hollowed out and connected internally. The oiling sleeve 53 is provided with multiple air inlets 54 at one end inside the outer sleeve 51. The outer sleeve 51 is provided with an automatic jet assembly 6, which is used to deliver gas into the oiling sleeve 53. The oiling sleeve 53 is provided with a ring of jet holes 55 at equal intervals around its end circumference.

[0033] The automatic jetting assembly 6 includes a bent rod 61 fixedly connected to the outer surface of the oiling bend 52. One end of the bent rod 61 is fixedly connected to the end of the oiling bend 52 away from the oiling sleeve 53, and the other end of the bent rod 61 is fixedly connected to an annular plate 62. A second thrust spring 63 is provided inside the outer sleeve 51. One end of the second thrust spring 63 is fixedly connected to the inner wall of the outer sleeve 51, and the other end of the second thrust spring 63 is fixedly connected to the annular plate 62. A corrugated pipe 64 is fixedly sleeved on the outer surface of the bent rod 61. The end of the corrugated pipe 64 near the oiling sleeve 53 is fixedly connected to the inner wall of the outer sleeve 51, and the end of the corrugated pipe 64 away from the oiling sleeve 53 is fixedly connected to the annular plate 62.

[0034] Before the pipe is inserted into the perforation, the auxiliary bending die 3 and the main bending die 2 are in the closed state. The oiling sleeve 53 is located inside the perforation and the outer surface of the oiling sleeve 53 is in contact with the inner wall of the perforation. At this time, the operator holds the end of the oiling sleeve 53, i.e. the semi-circular protrusion, and rotates it so that the oiling sleeve 53 rotates inside the perforation. During the rotation, the thin sponge on the outer surface of the oiling sleeve 53 evenly coats the pre-absorbed lubricating oil onto the inner wall surface of the perforation. At the same time, the oiling sleeve 53 occupies a certain space inside the perforation, which effectively prevents dust and impurities in the air from falling onto the lubricating oil film on the inner wall of the perforation, thus ensuring the cleanliness of the oiling surface. When the conveying unit 11 pushes the pipe axially into the perforation, the front end of the pipe contacts the semi-circular end of the oiling sleeve 53. As the pipe continues to advance, it pushes the oiling sleeve 53 into the inner part of the outer sleeve 51. The oiling sleeve 53 drives the oiling bend 52 to slide inward along the outer sleeve 51 and retract. As the oiling sleeve 53 exits the perforation, the thin sponge on the outer surface of the oiling sleeve 53 slides relative to the inner wall of the perforation, further and evenly applying the absorbed lubricating oil to the inner wall of the perforation, thus completing the oiling and lubrication of the perforation surface of the mold. The annular protrusion between the thin sponge and the end of the oiling sleeve 53 acts as a scraping structure during the exit of the oiling sleeve 53 from the perforation. The metal scraping or impurities that may exist on the inner wall of the perforation are scraped off, and the coated lubricating oil film is smoothed to make the oil film thickness more uniform. As the oiling bend 52 retracts, the ring plate 62 is moved away from the oiling sleeve 53 by the bending rod 61, compressing the second thrust spring 63. At the same time, the bellows 64 is stretched, and its internal chamber volume increases. Air is drawn in from the outside through the first one-way valve 66. When the pipe is completely inserted into the perforation, the oiling sleeve 53 is completely withdrawn from the perforation and retracted into the outer sleeve 51. The oiling bend 52 is in the retracted state, the second thrust spring 63 is in the compressed state, and the bellows 64 is in the stretched state and its interior is filled with the drawn-in air. After the oiled sleeve 53 is completely withdrawn from the perforation, the pipe reaches the starting position of bending. The two sets of clamping blocks 41 clamp the outer wall of the pipe from the top and bottom. The drive unit 12 drives the auxiliary bending mold 3 to rotate for bending. During this stage, the oiling component 5 does not participate in the work. After the bending is completed, the pipe remains bent at the bending position. After the bending process is completed and the pipe is removed from the perforation, the auxiliary bending die 3 and the main bending die 2 gradually separate and reset. During this process, the second thrust spring 63 rebounds, pushing the ring plate 62 to move closer to the oiling sleeve 53. The ring plate 62 drives the oiling bend 52 and the oiling sleeve 53 to extend outward and reset synchronously through the bending rod 61. As the oiling sleeve 53 extends out of the outer sleeve 51, the semi-circular protrusion at the end of the oiling sleeve 53 first contacts the edge of the clamping block 41, using its arc-shaped surface to smoothly push the clamping block 41 against the edge. The extension allows the oiling sleeve 53 to smoothly pass through the perforation area and return to its initial position inside the perforation. This process requires no manual intervention, achieving automatic reset of the oiling sleeve 53. Subsequently, under the action of the second thrust spring 63, the outer surface of the oiling sleeve 53 slides relative to the inner wall of the perforation again during the extension process. The thin sponge further spreads the remaining lubricating oil, while the annular protrusion scrapes away any metal debris that may remain on the inner wall of the perforation to the perforation entrance during the extension process. At the same time, the annular plate 62 moves closer to the oiling sleeve 53. When the oil casing 53 moves in the direction of compression, the bellows 64 is compressed, the internal chamber volume of the bellows 64 decreases, the internal gas is compressed, and the gas pressure increases. The second one-way valve 67 opens, and the compressed gas is discharged through the second one-way valve 67 to the reserved cavity 65. It then enters the gas passage inside the oil casing 53 and the oiling bend 52 through the air inlet 54 on the oil casing 53, and finally sprays out from the jet holes 55 equidistantly arranged on the circumference of the end of the oil casing 53. The jet holes 55 are designed at an angle, and the sprayed gas impacts the perforation inlet at an oblique angle. The metal debris scraped off by the annular protrusion is blown away from the working area of ​​the mold, keeping the perforation entrance and the perforation surface of the mold clean. After the reset action is completed, the oiling sleeve 53 returns to the initial position inside the perforation, the bellows 64 returns to its natural length, and the second thrust spring 63 returns to its natural extension state. At this time, the operator uses an air gun to supplement air to the annular protrusion area to remove any debris that may remain on the surface of the annular protrusion, preventing the accumulation of debris from contaminating the mold perforation when the oiling sleeve 53 enters again. It is important to note here that the air jetting action occurs before the annular protrusion contacts the inner wall of the perforation and begins the scraping process. The purpose of the air jetting is to use the impact force of high-pressure gas to disrupt the integrity and continuity of the residual oil film on the surface of the perforation's inner wall. After bending, the surface of the perforation's inner wall is covered with an oil film mixed with metal debris. This oil film has a certain degree of viscosity and surface tension. If the annular protrusion is used directly for scraping, the oil film will slide along with the debris and will be difficult to remove effectively. The air jetting action first disrupts the complete structure of the oil film, tearing it into multiple dispersed small areas, which significantly reduces the adhesion of the oil film to the debris. Subsequently, the oiling sleeve 53 continues to extend outward. The annular protrusion contacts the inner wall of the perforation and begins the scraping action. Since the integrity of the oil film has been disrupted by the air jet action, the annular protrusion only needs to overcome the residual adhesion of the dispersed oil film during the scraping process. It can more easily scrape the oil film along with the metal debris in it off the inner wall surface of the perforation, resulting in a more thorough and clean scraping effect. If the film is not broken by the air jet action beforehand, when the annular protrusion directly scrapes off the complete oil film, the viscoelasticity of the oil film will cause the debris to roll and move along with the oil film, making it difficult to remove effectively. Under the combined action of air jet and scraping, the oil film and metal debris on the inner wall surface of the perforation are effectively removed, maintaining the cleanliness of the perforation surface of the mold and preparing for the next bending process.

[0035] The outer sleeve 51 has a reserved cavity 65 inside, which is the space between the corrugated pipe 64 and the oiling sleeve 53. The corrugated pipe 64 contracts to inject gas into the oiling sleeve 53. The size of the corrugated pipe 64 and the size of the ring plate 62 are both smaller than the size of the inner wall of the outer sleeve 51. The end of the outer sleeve 51 away from the oiling sleeve 53 is connected to the outside.

[0036] A first one-way valve 66 is provided at one end of the bellows 64 near the second thrust spring 63. The first one-way valve 66 is used to send the gas inside the outer sleeve 51 into the bellows 64. A second one-way valve 67 is provided at one end of the bellows 64 near the oiled sleeve 53. The second one-way valve 67 is used to discharge the gas inside the bellows 64. The jet hole 55 is designed at an angle.

[0037] Inside the outer sleeve 51, a reserved cavity 65 is formed in the area between the bellows 64 and the oiled sleeve 53. This cavity provides temporary storage and transport space for the compressed gas generated during the compression of the bellows 64. The outer diameters of both the bellows 64 and the ring plate 62 are smaller than the inner diameter of the outer sleeve 51, creating a gap between them and the inner wall of the outer sleeve 51. This allows the gas inside the reserved cavity 65 to flow freely, preventing air resistance caused by local gas accumulation. The end of the outer sleeve 51 away from the oiled sleeve 53 is connected to the outside, ensuring that the space behind the ring plate 62 is open to the atmosphere during reciprocating motion. This prevents additional motion resistance due to air pressure changes, allowing the elastic force of the second thrust spring 63 to be fully utilized. The first one-way valve 66 is located at the end of the bellows 64 near the second thrust spring 63, that is, the end away from the oiled sleeve 53. Its conduction direction is unidirectional from the inside of the outer sleeve 51 to the inside of the bellows 64, so that the bellows 64 can draw in air from the outside when it is stretched. The second one-way valve 67 is located at the end of the bellows 64 near the oiled sleeve 53. Its conduction direction is unidirectional from the inside of the bellows 64 to the reserved cavity 65, so that the bellows 64 can discharge the internal gas to the reserved cavity 65 when it is compressed and finally spray it out from the jet hole 55. The two one-way valves are set in opposite directions, so that the bellows 64 can achieve automatic jet spraying without the need for an external air source.

[0038] Working principle: After the pipe bending machine is started, the conveying unit 11 pushes the pipe axially, allowing it to pass through the through hole formed between the main bending die 2, the auxiliary bending die 3, and the upper and lower sets of clamping blocks 41, reaching the preset bending start position. After the pipe is in place, the two sets of symmetrically arranged clamping blocks 41, through the composite elastic structure formed by the airbag body 42 and the first thrust spring 45, form flexible contact with the outer wall of the pipe from the top and bottom, clamping and positioning the pipe in the through hole of the main bending die 2. The soft rubber attached to the surface of the clamping block 41 is in direct contact with the outer wall of the pipe, so that the clamping force is evenly distributed on the outer wall of the pipe. The drive unit 12 drives the auxiliary bending die 3. The bending die 3 rotates and closes towards the main bending die 2. Two sets of secondary limiting blocks 44 move synchronously with the secondary bending die 3, inserting into the gaps between the corresponding main limiting blocks 43 and the main bending die 2, pushing the main limiting blocks 43 to slide outwards. The main limiting blocks 43, through the airbag body 42 and the first thrust spring 45, drive the clamping blocks 41 to move towards the pipe, increasing the clamping force of the clamping blocks 41 on the outer wall of the pipe. The secondary bending die 3 and the main bending die 2 cooperate to apply a bending torque to the pipe, causing plastic bending deformation. During the bending process, the two sets of clamping blocks 41 clamp the outer wall of the pipe from above and below, affecting the pipe cross-section. A vertical constraint force is applied to ensure the pipe wall is tightly pressed against the circular perforation surface of the main bending die 2. As the secondary limiting block 44 is gradually inserted into the gap, the clamping force gradually increases, reaching its maximum at the beginning of bending. When the rounded edge of the secondary limiting block 44 contacts and slides relative to the rounded surface of the main limiting block 43, the clamping force gradually decreases. When the secondary limiting block 44 completely passes over the rounded area of ​​the main limiting block 43, the two disengage, the clamping force returns to zero, and the pipe enters the stress release stage. During bending, the oiling component 5 has completed the lubrication of the inner wall of the perforation. When the pipe is fed in, its front end pushes the oiled sleeve 53 back into the outer sleeve 51. A thin sponge evenly coats the lubricating oil onto the inner wall of the perforation. After the tube is bent and removed, the second thrust spring 63 rebounds and pushes the oiled sleeve 53 outward to reset. The bellows 64 is compressed to generate compressed gas. The gas enters the internal channel of the oiled sleeve 53 through the second one-way valve 67, the reserved cavity 65, and the air inlet 54, and is ejected from the air jet 55, destroying the integrity of the residual oil film on the inner wall of the perforation. Subsequently, the annular protrusion scrapes away the oil film along with metal debris. The semi-circular protrusion at the end of the oiled sleeve 53 pushes open the clamping block 41, and the oiled sleeve 53 returns to its initial position inside the perforation. Thus, a complete bending cycle is completed.

[0039] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0040] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0041] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0042] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A motorcycle frame bending forming processing device, comprising a bending machine body (1), wherein a conveying unit (11) for pushing bending raw materials is provided on the bending machine body (1), a main bending die (2) is fixedly provided on the bending machine body (1), a secondary bending die (3) is also provided on the bending machine body (1), and a driving unit (12) is fixedly provided on the bending machine body (1), wherein the driving unit (12) is used to rotate the secondary bending die (3) to cooperate with the main bending die (2) and to bend the bending raw materials, characterized in that: The main bending die (2) is provided with a stress relief component (4); The stress relief component (4) is in flexible contact with the bending tube raw material. The stress relief component (4) includes a clamping block (41) elastically connected to the main bending die (2). There are two sets of clamping blocks (41), and the two sets of clamping blocks (41) are arranged symmetrically up and down. There are through holes for the bending tube raw material between the two sets of clamping blocks (41) and the main bending die (2) and the secondary bending die (3).

2. The motorcycle frame bending and forming device according to claim 1, characterized in that, Two sets of main limiting blocks (43) are slidably arranged on the main bending mold (2). The two sets of main limiting blocks (43) are designed symmetrically from top to bottom. Each main limiting block (43) is fixedly connected to the airbag body (42). The end of the airbag body (42) away from the main limiting block (43) is fixedly connected to the clamping block (41). A first thrust spring (45) is fixedly arranged inside the airbag body (42).

3. The motorcycle frame bending and forming device according to claim 2, characterized in that, There is a gap between the two sets of main limiting blocks (43) and the main bending mold (2). Two sets of secondary limiting blocks (44) are fixedly installed on the secondary bending mold (3). The two sets of secondary limiting blocks (44) are used in conjunction with the two sets of main limiting blocks (43). The two sets of secondary limiting blocks (44) are used to insert into the gap between the main limiting blocks (43) and the main bending mold (2). The edges of the two sets of main limiting blocks (43) and the two sets of secondary limiting blocks (44) that are close to each other are designed with rounded corners.

4. The motorcycle frame bending and forming device according to claim 3, characterized in that, Both sets of main limiting blocks (43) have rounded corners on their sides.

5. The motorcycle frame bending and forming device according to claim 4, characterized in that, An oiling assembly (5) is fixedly installed on the main bending die (2). The oiling assembly (5) is used to apply lubricating oil to the inside of the perforation. The oiling assembly (5) includes an outer sleeve (51) fixedly installed on the outer surface of the main bending die (2). An oiling bend (52) is slidably sealed inside the outer sleeve (51). An oiling sleeve (53) is rotatably installed on the oiling bend (52). The oiling sleeve (53) is used in conjunction with the perforation.

6. The motorcycle frame bending and forming apparatus according to claim 5, characterized in that, The end of the oiling sleeve (53) is semi-circular, and a thin sponge is attached to the outer surface of the oiling sleeve (53). The thin sponge and the end of the oiling sleeve (53) have a ring-shaped protrusion.

7. The motorcycle frame bending and forming apparatus according to claim 6, characterized in that, The oiling sleeve (53) and the oiling bend (52) are hollowed out and connected internally. The oiling sleeve (53) is provided with multiple sets of air inlets (54) at one end inside the outer sleeve (51). The outer sleeve (51) is provided with an automatic jet assembly (6). The automatic jet assembly (6) is used to send gas into the oiling sleeve (53). The oiling sleeve (53) is provided with a ring of jet holes (55) at equal intervals around its end.

8. The motorcycle frame bending and forming apparatus according to claim 7, characterized in that, The automatic jetting assembly (6) includes a bent rod (61) fixedly connected to the outer surface of the oiling bend (52). One end of the bent rod (61) is fixedly connected to the end of the oiling bend (52) away from the oiling sleeve (53). The other end of the bent rod (61) is fixedly connected to a ring plate (62). A second thrust spring (63) is provided inside the outer sleeve (51). One end of the second thrust spring (63) is fixedly connected to the inner wall of the outer sleeve (51). The other end of the second thrust spring (63) is fixedly connected to the ring plate (62). A corrugated pipe (64) is fixedly sleeved on the outer surface of the bent rod (61). The end of the corrugated pipe (64) near the oiling sleeve (53) is fixedly connected to the inner wall of the outer sleeve (51). The end of the corrugated pipe (64) away from the oiling sleeve (53) is fixedly connected to the ring plate (62).

9. The motorcycle frame bending and forming apparatus according to claim 8, characterized in that, The outer sleeve (51) has a reserved cavity (65) inside. The reserved cavity (65) is the space between the corrugated pipe (64) and the oiling sleeve (53). The corrugated pipe (64) contracts to inject gas into the oiling sleeve (53). The size of the corrugated pipe (64) and the size of the ring plate (62) are both smaller than the size of the inner wall of the outer sleeve (51). The end of the outer sleeve (51) away from the oiling sleeve (53) is connected to the outside.

10. The motorcycle frame bending and forming apparatus according to claim 9, characterized in that, A first check valve (66) is provided at one end of the bellows (64) near the second thrust spring (63). The first check valve (66) is used to send the gas inside the outer sleeve (51) into the bellows (64). A second check valve (67) is provided at one end of the bellows (64) near the oiled sleeve (53). The second check valve (67) is used to discharge the gas inside the bellows (64). The jet hole (55) is designed at an angle.

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