Door sill inner plate flange edge straightening tool

Abstract

The present application relates to the technical field of automobile accessory processing equipment, in particular to a straightening tool for the flange edge of a door sill inner panel. The tool comprises a frame body, a straightening wheel set and a roller conveyor are arranged on the frame body, an interference hot-pressing mechanism is arranged on the frame body and behind the straightening wheel set, the interference hot-pressing mechanism comprises a first pressing assembly and a second pressing assembly, the first pressing assembly and the second pressing assembly each comprise a pressing wheel arranged on the upper side and the lower side of the corresponding flange edge, the first pressing assembly and the second pressing assembly each further comprise a hot-pressing driver, the hot-pressing driver has a gas pipe and an over-pressing structure behind it, and the gas pipe has a gas hole opposite the flange edge. The present application synchronously applies interference pressure by hot air flow and a pressing wheel driven by a sliding block, so that the flange edge is accurately plastically deformed in a softened state, and is quickly shaped by a cooling structure, thereby effectively preventing secondary deformation caused by material elastic recovery or thermal stress residue.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing equipment technology, specifically to a tooling for straightening the flange edge of the door sill inner panel. Background Technology

[0002] In automobile manufacturing, the sill inner panel, as a crucial load-bearing component of the vehicle body structure, has a reference-side flange and an operating-side flange. The flatness and shape accuracy of these flanges directly affect the overall vehicle assembly quality and structural safety. Existing straightening processes often employ mechanical pressing or manual hammering, which, while capable of correcting flange deformation to some extent, generally suffer from low straightening accuracy, easy material damage, low operational efficiency, and strong reliance on manual experience.

[0003] A currently publicly disclosed Chinese authorization announcement number, CN108202094B, describes a roll forming machine for automotive door sill plates. It includes a bed; a roller frame assembly mounted on the bed for extruding workpieces to form the shape; a power assembly mounted on the bed and linked to the roller frame assembly; and a detection and cutting assembly mounted on the bed for cutting the formed workpiece. The power assembly includes a reducer, a worm gear assembly, and a servo motor. The servo motor is connected to the worm gear assembly, the reducer is connected to the worm gear assembly, and the roller frame assembly is connected to the reducer. The roller frame assembly includes a rubber protective pad, several mounting brackets, driven wheels, and a driving wheel. The rubber protective pad is mounted on the bed, and the mounting brackets are fixed to the rubber protective pad and arranged sequentially along a straight line. The driven wheels and the driving wheels are both mounted on the mounting brackets, forming an extrusion channel between them. The workpiece gradually forms after passing through the extrusion channel on each mounting bracket.

[0004] According to the aforementioned patent, the material to be processed is clamped and rolled in one operation. However, during the rolling process, the metal material may undergo a certain degree of elastic deformation. Once the rolling pressure is removed, the material may spring back, resulting in a less than expected straightening effect, and slight bending or twisting may still exist. Therefore, there is a need for a straightening fixture for the inner flange edge of the door sill with springback compensation function to effectively offset the dimensional deviation caused by material springback. Summary of the Invention

[0005] To address the problems existing in the current technology, a tooling for straightening the flange edge of the inner sill plate is provided. The initial shaping of the flange edge is achieved through a roller conveyor and a straightening wheel set. Combined with uniform heating by hot airflow and synchronous application of interference pressure by a slider-driven pressure roller, the flange edge completes precise plastic deformation in a softened state. The cooling structure achieves rapid shaping, effectively preventing secondary deformation caused by material elastic recovery or residual thermal stress.

[0006] To address the problems of existing technologies, this invention provides a straightening fixture for the flange edge of a door sill inner panel, comprising a frame, on which a straightening wheel assembly and a roller conveyor for conveying the door sill inner panel through the straightening wheel assembly are mounted. An interference hot pressing mechanism is located on the frame and behind the straightening wheel assembly to counteract the springback deviation of the flange edge. The interference hot pressing mechanism includes a first pressing component and a second pressing component respectively positioned on the flange edges on both sides of the door sill inner panel. The first and second pressing components each include pressure rollers positioned on the upper and lower sides of the corresponding flange edge, and both pressure rollers are capable of moving in a direction perpendicular to the flange edge. The first and second pressing components also each include a hot pressing actuator for driving the movement of the corresponding two pressure rollers. The hot pressing actuator has an air pipe and an overpressure structure located behind it and linked to it. The air pipe has an air hole facing the flange edge. When hot air flows through the air hole and acts on the flange edge, the overpressure structure is synchronously triggered under the air pressure, causing the flange edge to be interference-pressed by the two pressure rollers in a heated state to prevent springback.

[0007] Preferably, the overpressure structure has an air chamber connected to the air pipe and sliders respectively connected to the corresponding pressure rollers for rotation. The air chamber is provided with a slide rail for the sliders to move vertically. When the airflow forms a continuous pressurized state in the air chamber, the two sliders gradually approach each other, so that the pressure on the flange edge from the two pressure rollers gradually increases.

[0008] Preferably, a pressurized chamber is formed between the two sliders and the air chamber, and the edges of the two sliders facing away from each other in the pressurized chamber are chamfered. When the pressurized chamber is continuously pressurized and the airflow is guided to flow along the chamfered edges, a lateral force is formed acting on the sliders, causing the two sliders to be pushed to move in a direction closer to each other.

[0009] Preferably, a rubber block is provided between the two sliders to limit the interference pressure and assist in reset. When the rubber block is not deformed, the pressure on the flange edge between the two pressure rollers is in an uninterrupted state.

[0010] Preferably, the pressure roller is made of rubber. When the pressure roller applies pressure to the flange edge, the pressure roller is in a deformed state, so that the flange edge is in an interference compression state of non-pressure thinning.

[0011] Preferably, the axial direction of the air pipe is parallel to the conveying direction of the inner sill plate, and the air pipe has a number of air holes at equal intervals along its axial direction. A heated area is formed between two air pipes. When the hot air enters the heated area, the heated area is in a preheated state, so that the flange edge is fully preheated before being pressurized.

[0012] Preferably, a cooling structure is provided behind the air chamber for rapid cooling to maintain its shape after the flange edge is pressurized.

[0013] Preferably, the cooling structure has a valve body and a valve block disposed therein. The valve body has a first air passage facing the flange edge, and the valve block has a second air passage that can communicate with the first air passage. When the air pipe acts on the valve block, the second air passage connects to the first air passage, so that the flange edge can be cooled immediately while being heated and subjected to interference compression.

[0014] Preferably, a pressure-receiving component is provided between the valve block and the air outlet end of the air pipe, and a return spring is provided between the pressure-receiving component and the air chamber. When the return spring is not compressed, the first air passage is in a closed state.

[0015] Preferably, the frame is provided with a support plate for mounting the first pressure application component and the second pressure application component. The support plate is provided with elastic valves and pressure sensors connected to the upper and lower sides of the flanges on both sides of the inner sill plate. The pressure sensors are electrically connected to the corresponding thermo-pressure actuators.

[0016] The advantages of this application compared to the prior art are:

[0017] 1. This invention achieves the initial shaping of the flange edge of the inner sill plate by using a roller conveyor in conjunction with a straightening roller set. Subsequently, hot air is used to heat the flange edge and drive the slider to drive the pressure roller to apply interference pressure synchronously, so that the flange edge completes precise plastic deformation in a softened state.

[0018] During this process, the airflow is guided by the chamfered edge within the pressurized chamber to generate a tangential force, which pushes the slider to control the pressure on the flange edge. This effectively prevents material springback, significantly improves straightening accuracy and stability, and enables efficient, continuous, and automated straightening operations.

[0019] 2. This invention limits the pressure range of the two pressure rollers by the elastic deformation of the rubber block, avoiding excessive pressure that could damage the material and ensuring that the interference pressure applied to the flange edge is always within a safe and effective range.

[0020] Meanwhile, the use of rubber pressure rollers ensures effective compression while preventing the flange edge from contacting the metal, which could lead to thinning or surface scratches. This allows for precise and safe straightening of the flange edge under heating conditions, effectively preventing springback and protecting material properties and structural integrity.

[0021] 3. This invention uses evenly distributed air holes on the air pipe to spray hot air onto the flange edge, achieving uniform preheating during the heating stage and improving the material's plastic deformation capacity. Simultaneously, immediately after interference extrusion, a cooling medium is sprayed through the cooling structure, allowing the flange edge to quickly set and effectively preventing springback and secondary deformation caused by thermal stress.

[0022] During this process, the airflow acts on the pressure-bearing components, achieving a seamless connection between heating, pressurizing, and cooling actions. This ensures coordinated control of temperature and pressure on the flange edge throughout the straightening process, improving straightening accuracy and material forming stability.

[0023] 4. This invention achieves real-time monitoring of the springback trend of the flange edge through the linkage of an elastic valve and a pressure sensor. When springback force occurs after the flange edge is straightened, the elastic valve deforms accordingly and feeds back the signal to the hot-press actuator via the pressure sensor, triggering the corresponding hot-press actuator to perform supplementary interference extrusion on the springback side of the flange edge. This achieves dynamic sensing and automatic compensation control of the springback amount during the straightening process, effectively improving straightening accuracy and stability, and ensuring the consistency of the final flange edge forming quality. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the sill inner plate flange straightening fixture of the present invention.

[0025] Figure 2 This is a three-dimensional structural diagram of the straightening wheel assembly and the inner sill plate of the sill plate straightening fixture of the present invention.

[0026] Figure 3 This is a three-dimensional structural diagram of the interference hot pressing mechanism of the sill inner plate flange straightening fixture of the present invention.

[0027] Figure 4 This is a partial planar sectional view of the interference hot pressing mechanism of the sill inner plate flange edge straightening fixture of the present invention.

[0028] Figure 5 This is a partial three-dimensional cross-sectional view of the interference hot pressing mechanism of the sill inner plate flange edge straightening fixture of the present invention. Figure 1 .

[0029] Figure 6 This is a partial three-dimensional cross-sectional view of the interference hot pressing mechanism of the sill inner plate flange edge straightening fixture of the present invention. Figure 2 .

[0030] Figure 7 This is a three-dimensional structural diagram of the first pressure-applying component of the door sill inner plate flange edge straightening fixture of the present invention.

[0031] Figure 8 This is a partial planar sectional view of the first pressure-applying component of the sill inner plate flange edge straightening fixture of the present invention.

[0032] Figure 9 This is a partial three-dimensional cross-sectional view of the first pressure-applying component of the sill inner plate flange edge straightening fixture of the present invention. Figure 1 .

[0033] Figure 10 This is a partial three-dimensional cross-sectional view of the first pressure-applying component of the sill inner plate flange edge straightening fixture of the present invention. Figure 2 .

[0034] The following components are labeled in the diagram: 1. Frame; 11. Support plate; 111. Elastic valve; 112. Pressure sensor; 2. Inner sill plate; 21. Reference side flange; 22. Operating side flange; 3. Straightening wheel assembly; 31. Reference side straightening wheel; 32. Operating side straightening wheel; 4. Roller conveyor; 5. Interference-fit hot pressing mechanism; 6. First pressure application component; 61. Pressure roller; 62. Hot pressing driver; 621. Air pipe; 6211. Air hole; 622. Overpressure structure; 623. Air chamber; 6231. Slide rail; 6232. Pressurization chamber; 624. Slider; 6241. Chamfered edge; 6242. Rubber block; 7. Second pressure application component; 8. Cooling structure; 81. Valve body; 811. First air passage; 82. Valve block; 821. Second air passage; 83. Pressure-bearing component; 831. Guide sleeve; 84. Return spring. Detailed Implementation

[0035] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0036] See Figures 1-7 As shown, the sill inner plate flange straightening fixture includes a frame 1. The frame 1 is equipped with a straightening roller set 3 and a roller conveyor 4 for conveying the sill inner plate 2 through the straightening roller set 3. An interference hot pressing mechanism 5 is located on the frame 1 and behind the straightening roller set 3 to counteract the flange edge springback deviation. The interference hot pressing mechanism 5 includes a first pressing component 6 and a second pressing component 7 respectively positioned on both sides of the flange edge of the sill inner plate 2. The first pressing component 6 and the second pressing component 7 each include pressure rollers 61 positioned on the upper and lower sides of the corresponding flange edge. Both pressure rollers 61 can... Moving in a direction perpendicular to the flange edge, the first pressure application component 6 and the second pressure application component 7 also include a hot pressure driver 62 for driving the corresponding two pressure rollers 61 to move. The hot pressure driver 62 has an air pipe 621 and an overpressure structure 622 located behind it and linked to it. The air pipe 621 has an air hole 6211 opened facing the flange edge. When the hot air flows through the air hole 6211 and acts on the flange edge, the overpressure structure 622 is in a synchronous triggering state under the air flow pressure, so that the flange edge is pressurized by the two pressure rollers 61 in the heated state to prevent rebound.

[0037] The two flange edges of the inner sill plate 2 are the reference side flange edge 21 and the operating side flange edge 22, respectively.

[0038] The first pressure-applying component 6 is used to straighten the operating side flange edge 22, and the second pressure-applying component 7 is used to straighten the reference side flange edge 21.

[0039] The straightening wheel set 3 consists of a reference side straightening wheel 31 and an operating side straightening wheel 32. The reference side flange edge 21 and the operating side flange edge 22 of the inner sill plate 2 are respectively provided with multiple reference side straightening wheels 31 and operating side straightening wheels 32.

[0040] During the straightening process, the inner sill plate 2 is first smoothly fed into the straightening wheel group 3 area by the roller conveyor 4. The reference side flange edge 21 and the operating side flange edge 22 are respectively straightened by the reference side straightening wheel 31 and the operating side straightening wheel 32 set on both sides.

[0041] As the inner sill plate 2 continues to move forward, it reaches the interference hot pressing mechanism 5 located behind the straightening wheel set 3 after straightening. If the operating side flange edge 22 or the reference side flange edge 21 exhibits a springback phenomenon, the flange edge on the corresponding side will be further straightened by the first pressure component 6 or the second pressure component 7 through hot pressing.

[0042] The interference fit occurs when the flange edge of the straightened inner sill plate 2 springs back. This is achieved by heating and softening the material, then using two pressure rollers 61 to apply a small amount of compressive pressure to the flange edge from above and below. This causes plastic deformation in the thickness direction exceeding its elastic limit, thus offsetting the deviation caused by subsequent cooling and springback. The interference fit does not refer to a geometric fit, but rather to an applied pressure exceeding the material's elastic recovery capacity, resulting in a controllable, compensatory plastic deformation state. This ensures that the flange edge maintains ideal flatness and shape accuracy after cooling, preventing springback and improving forming accuracy.

[0043] Specifically, the hot press drive 62 is activated, causing the hot airflow in the air pipe 621 to act directly on the metal surface through the air hole 6211 facing the flange edge. While heating the flange edge, the upper and lower pressure rollers 61 are driven to move closer to the flange edge and simultaneously apply interference compression under the trigger of airflow pressure. The heating and pressurizing process allows the flange edge to be precisely extruded and shaped in a softened state, effectively preventing subsequent springback and ensuring that the flange edges on both sides of the inner sill plate 2 achieve the required geometric shape and dimensional accuracy. The entire process is completed in continuous conveying, realizing efficient and precise automated straightening operations.

[0044] To optimize the heating effect and avoid interference from the pressure roller 61 to the hot airflow, the air hole 6211 is designed in front of the pressure roller 61, meaning that the inner sill plate 2 is first heated through the air hole 6211. Specifically, after the inner sill plate 2 passes through the straightening roller assembly 3, its flange edge is first exposed to the hot airflow released by the air hole 6211, ensuring that the flange edge is uniformly heated in the thickness direction. Subsequently, when the flange edge reaches a suitable softening temperature, it enters the first pressing assembly 6 or the second pressing assembly 7, which consists of two pressure rollers 61, for interference compression, thereby achieving plastic deformation to offset springback deviation. This not only ensures the effectiveness and uniformity of heating but also avoids the pressure roller 61 obstructing or affecting the hot airflow during the pressing process, helping to improve the efficiency and quality of the entire heating and forming process.

[0045] See Figures 4-10 As shown, the overpressure structure 622 has an air chamber 623 connected to the air pipe 621 and sliders 624 respectively connected to the corresponding pressure rollers 61 for rotation. The air chamber 623 is provided with a slide rail 6231 for the sliders 624 to move vertically. When the airflow forms a continuous pressurized state in the air chamber 623, the two sliders 624 gradually approach each other, so that the pressure on the flange edge from the two pressure rollers 61 gradually increases.

[0046] During the alignment process, when the flange edge of the inner sill plate 2 passes the interference-fit hot pressing mechanism 5, the hot pressing actuator 62 starts to work. The high-temperature airflow in the air pipe 621 enters the air chamber 623 connected to it, and a state of continuous pressurization is formed therein. As the air pressure continues to rise, the two sliders 624 set in the air chamber 623 move vertically along the slide rail 6231 on the air chamber 623 under the action of air pressure, and the two sliders 624 gradually move closer to each other.

[0047] The movement of slider 624 drives the two upper and lower pressure rollers 61 connected to it to move synchronously, causing the distance between the two pressure rollers 61 to gradually decrease, thereby applying gradually increasing pressure to the flange edge located therein. During this process, the flange edge is in a heated and softened state, so it can achieve more complete plastic deformation under the continuous extrusion of the pressure rollers 61, effectively eliminating shape deviations caused by material springback, and further improving straightening accuracy and stability.

[0048] See Figures 7-10 As shown, a pressurized chamber 6232 is formed between the two sliders 624 and the air chamber 623. The edges of the two sliders 624 that are far apart from each other in the pressurized chamber are chamfered edges 6241. When the pressurized chamber 6232 is continuously pressurized and the airflow is guided to flow along the chamfered edges 6241, a transverse component force is formed on the sliders 624, which pushes the two sliders 624 to move in a direction closer to each other.

[0049] When the high-pressure airflow continuously enters the pressurization chamber 6232 and flows along the chamfered edge 6241, the airflow generates a tangential component force due to the guiding effect of the chamfered surface. The direction of this component force is towards the side where the two sliders 624 are close to each other.

[0050] As the air pressure in the pressurization chamber 6232 continues to rise, the transverse cutting force gradually increases, pushing the two sliders 624 to move closer to each other along the slide rail 6231, thereby driving the upper and lower pressure rollers 61 to move closer to the center, applying gradually increasing pressure to the flange edge, which is carried out synchronously with the flange edge heating process, to achieve precise interference extrusion straightening of the flange edge under heating conditions.

[0051] See Figures 8-10 As shown, a rubber block 6242 is provided between the two sliders 624 to limit the interference pressure and assist in reset. When the rubber block 6242 is not deformed, the pressure on the flange edge between the two pressure rollers 61 is in an uninterrupted state.

[0052] In the unpressurized state, the two sliders 624 are in the starting position inside the air chamber 623 and are kept stable by the slide rails 6231 set on them.

[0053] When the hot gas flows into the pressurization chamber 6232 through the air pipe 621 and is continuously pressurized, the two sliders 624 move along the slide rail 6231 toward each other. The sliders 624 gradually compress the middle rubber block 6242, which begins to deform and provides a reaction force, limiting the sliders 624 from moving closer, thereby controlling the interference pressure applied to the flange edge.

[0054] As the rubber block 6242 is compressed, the reaction force gradually increases, ensuring that the slider 624 does not get too close and avoiding excessive pressure on the flange edge. This allows the flange edge to be evenly and appropriately clamped by the upper and lower pressure rollers 61 under heating conditions, preventing material rebound and ensuring that the material is not damaged due to excessive pressure during the straightening process.

[0055] When the pressurization process ends and the airflow stops, the pressure inside the pressurization chamber 6232 drops. Due to its elastic properties, the rubber block 6242 begins to return to its original shape, pushing the two sliders 624 outward to return to their initial positions.

[0056] See Figures 7-10 As shown, the pressure roller 61 is made of rubber. When the pressure roller 61 applies pressure to the flange edge, the pressure roller 61 is in a deformed state, so that the flange edge is in an interference compression state of non-pressure thinning.

[0057] The rubber pressure roller 61 has good elasticity and compressibility. When subjected to pressure, it undergoes elastic deformation instead of converting all the force into plastic deformation in the thickness direction of the material. This means that during the straightening process, the rubber pressure roller 61 will not significantly change the original thickness of the flange edge.

[0058] At the same time, the pressure limitation of rubber block 6242 avoids the risk of material thinning, hardening, or even cracking caused by excessive compression. It effectively protects material performance and structural strength, providing only interference-assisted straightening.

[0059] See Figures 4-10 As shown, the axial direction of the air pipe 621 is parallel to the conveying direction of the inner sill plate 2. The air pipe 621 has a number of air holes 6211 at equal intervals along its axial direction. A heated area is formed between two air pipes 621. When the hot air enters the heated area, the heated area is in a preheated state, so that the flange edge is fully preheated before being pressed by interference.

[0060] The two air pipes 621 correspond to the reference side flange 21 and the operating side flange 22 of the inner sill plate 2, respectively.

[0061] As the hot airflow enters the heated area through the air pipe 621, it is evenly ejected from each air hole 6211, providing comprehensive and uniform heating to the flange edge. This ensures the flange edge is fully preheated before entering the interference fit stage. This guarantees the flange edge reaches the required temperature before being pressed by the upper and lower pressure rollers 61, effectively improving the material's plastic deformation capacity, thereby enhancing the straightening effect and reducing the risk of springback.

[0062] See Figures 7-10 As shown, a cooling structure 8 is provided behind the air chamber 623 for rapid cooling to maintain its shape after the flange edge is pressurized.

[0063] The cooling structure 8 is located behind the pressure roller 61. This means that the inner sill plate 2 enters the cooling zone only after the flange edge has undergone interference extrusion during the straightening process, preventing the pressure roller 61 from obstructing or affecting the cooling medium during the pressing process. After the flange edge passes between the upper and lower pressure rollers 61 of the first and second pressure components 6 and completes heating, softening, and plastic deformation, it immediately enters the effective range of the cooling structure 8 located behind the air chamber 623. At this time, the cooling structure 8 sprays cooling medium onto the flange edge surface, rapidly reducing its temperature and allowing the ideal shape formed by extrusion to be quickly solidified and set during the cooling process. This ensures that the flange edge is cooled immediately after straightening and forming, avoiding shape deviations caused by material springback or residual thermal stress, thereby effectively improving the stability of straightening accuracy and the consistency of finished product quality.

[0064] After the flange edge is straightened by interference extrusion, the cooling structure 8 located behind the air chamber 623 immediately comes into play. By spraying cooling medium onto the flange edge surface, its temperature drops rapidly, thereby quickly shaping the plastic deformation state formed by the flange edge during heating and extrusion.

[0065] The cooling structure 8 not only improves the stability of the straightening accuracy, but also effectively prevents secondary deformation caused by material elastic recovery or residual thermal stress, ensuring that the flange edge maintains ideal geometric shape and dimensional accuracy after straightening.

[0066] See Figures 7-10 As shown, the cooling structure 8 has a valve body 81 and a valve block 82 disposed therein. The valve body 81 is provided with a first air passage 811 facing the flange edge, and the valve block 82 is provided with a second air passage 821 that can communicate with the first air passage 811. When the air pipe 621 circulates air and acts on the valve block 82, the second air passage 821 connects to the first air passage 811, so that the flange edge can be cooled immediately while being heated and subjected to interference compression.

[0067] Initially, the first air passage 811 and the second air passage 821 are isolated from each other. When hot air is introduced into the air pipe 621 and acts on the valve block 82, it pushes the valve block 82 to move, connecting the second air passage 821 with the first air passage 811. The cooling medium is then rapidly sprayed through the first air passage 811 and the second air passage 821 onto the flange edge surface that has been heated and pressurized, thus immediately initiating the cooling and shaping process. This achieves seamless connection between heating, pressurization, and cooling actions, ensuring that the flange edge cools and solidifies rapidly after plastic deformation, effectively preventing shape deviations caused by springback or thermal stress, and improving straightening accuracy and stability.

[0068] See Figures 7-10 As shown, a pressure-receiving component 83 is provided between the valve block 82 and the air outlet end of the air pipe 621. A return spring 84 is provided between the pressure-receiving component 83 and the air chamber 623. When the return spring 84 is not compressed, the first air passage 811 is in a closed state.

[0069] The pressure-receiving component 83 is specifically a rod structure coaxial with the air pipe 621. One end of the pressure-receiving component 83 is fixedly connected to the valve block 82, and the other end extends toward the air outlet end of the air pipe 621. The air chamber 623 is provided with a guide sleeve 831 for the pressure-receiving component 83 to slide therein.

[0070] The end of the pressure-bearing member 83 extending toward the air outlet of the air pipe 621 has a protrusion capable of blocking the pipe opening, and the air outlet of the air pipe 621 has an inner edge that fits with the protrusion.

[0071] The air chamber 623 is provided with a step that can contact the protrusion. When the air pipe 621 is ventilated, the protrusion is pushed out of the inner edge under pressure until it contacts the step. At this time, the first air passage 811 is fully opened.

[0072] Specifically, when hot air is introduced into the air pipe 621, the protrusion at the end of the pressure-bearing component 83 is pushed open by the air pressure, overcoming the elastic force of the return spring 84 and pushing the valve block 82 to move. This causes the second air passage 821 to connect with the first air passage 811 on the valve body 81. At the same time, the protrusion detaches from the inner edge of the air outlet end of the air pipe 621 and finally abuts against the stepped surface of the air chamber 623. At this time, the first air passage 811 in the cooling structure 8 is fully opened, and the cooling medium is sprayed through the connected second air passage 821 and the first air passage 811 onto the flange edge surface that has been heated and pressurized, and quickly begins to cool and solidify.

[0073] When the air supply to the air pipe 621 stops, the return spring 84 pushes the pressure-bearing component 83 back to its original position, causing the valve block 82 to return to its initial position, closing the first air passage 811. At the same time, the protrusion re-blocks the air outlet of the air pipe 621, preparing for the next cycle. This achieves coordinated control of heating, pressurization, and cooling actions, ensuring that the flange edge is always in a controlled temperature and pressure environment, effectively improving straightening accuracy and material forming stability, and preventing springback or deformation problems caused by improper cooling timing.

[0074] See Figures 4-6 As shown, the frame 1 is provided with a support plate 11 for the installation of the first pressure application component 6 and the second pressure application component 7. The support plate 11 is provided with elastic valves 111 on the upper and lower sides of the flanges on both sides of the inner sill plate 2 and pressure sensors 112 connected thereto. The pressure sensors 112 are electrically connected to the corresponding thermo-pressure driver 62.

[0075] During the process of conveying the inner sill plate 2 to the interference hot pressing mechanism 5, the upper and lower positions of its two flange edges respectively contact the elastic valves 111 provided on the support plate 11. When the flange edge still has a tendency to spring back after being shaped by the straightening wheel group 3, the springback force of the flange edge acts on the corresponding elastic valve 111, causing the elastic valve 111 to deform.

[0076] The deformation state causes the pressure sensor 112 connected to it to generate a corresponding pressure signal, and feeds the signal back to the corresponding hot press driver 62 to trigger the corresponding hot press driver 62 to start, driving the pressure roller 61 on the corresponding springback side to perform supplementary interference extrusion, realizing real-time perception and response to the springback state of the flange edge, ensuring dynamic compensation control of the springback amount during the entire straightening process, and improving straightening accuracy and stability.

[0077] This invention achieves preliminary shaping of the flange edge through a roller conveyor 4 and a straightening roller set 3. Combined with uniform heating by hot airflow and synchronous application of interference pressure by the slider 624 driving the pressure roller 61, the flange edge completes precise plastic deformation in a softened state. During this process, the elastic valve 111 and the pressure sensor 112 work together to achieve real-time monitoring and dynamic compensation control of the rebound state.

[0078] After detecting the springback trend of the flange edge, pressure control is achieved by utilizing the lateral shear force generated by the chamfered edge 6241 within the pressure chamber 6232. Combined with the elastic structure of the rubber block 6242 and the rubber pressure roller 61, material damage is avoided and springback is effectively prevented. Simultaneously, rapid shaping is achieved through the cooling structure 8, effectively preventing secondary deformation caused by material elastic recovery or residual thermal stress, ensuring that the flange edge maintains ideal geometric shape and dimensional accuracy after straightening.

[0079] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A sill plate flange straightening fixture, including a frame (1), wherein the frame (1) is provided with a straightening wheel set (3) and a roller conveyor (4) for conveying the sill plate (2) through the straightening wheel set (3); Its features are, An interference hot pressing mechanism (5) is provided on the frame (1) and behind the straightening wheel group (3) to counteract the rebound deviation of the flange edge. The interference hot pressing mechanism (5) includes a first pressing component (6) and a second pressing component (7) respectively corresponding to the flange edges on both sides of the inner sill plate (2). The first pressing component (6) and the second pressing component (7) respectively include pressure rollers (61) arranged on the upper and lower sides of the corresponding flange edge. Both pressure rollers (61) can move in a direction perpendicular to the flange edge. The first pressing component (6) and the second pressing component (7) also include a hot pressing driver (62) for driving the movement of the corresponding two pressure rollers (61). The hot pressure actuator (62) has an air pipe (621) and an overpressure structure (622) located behind it and linked thereto. The air pipe (621) has an air hole (6211) facing the flange edge. When the hot air flows through the air hole (6211) and acts on the flange edge, the overpressure structure (622) is in a synchronous triggering state under the air pressure, so that the flange edge is pressurized by two pressure rollers (61) in the heated state to prevent rebound.

2. The sill inner plate flange edge straightening fixture according to claim 1, characterized in that, The overpressure structure (622) has an air chamber (623) connected to the air pipe (621) and a slider (624) provided therein for the corresponding pressure roller (61) to rotate. The air chamber (623) is provided with a slide rail (6231) for the slider (624) to move vertically. When the airflow forms a continuous pressurized state in the air chamber (623), the two sliders (624) gradually approach each other, so that the pressure on the flange edge from the two pressure rollers (61) gradually increases.

3. The sill inner plate flange edge straightening fixture according to claim 2, characterized in that, A pressurized chamber (6232) is formed between the two sliders (624) and the air chamber (623). The edges of the two sliders (624) that are far apart from each other in the pressurized chamber are chamfered edges (6241). When the pressurized chamber (6232) is continuously pressurized and the airflow is guided to flow along the chamfered edges (6241), a transverse shear force is formed on the sliders (624), causing the two sliders (624) to be pushed to move in a direction closer to each other.

4. The sill inner plate flange edge straightening fixture according to claim 3, characterized in that, A rubber block (6242) is provided between the two sliders (624) to limit the interference pressure and assist in reset. When the rubber block (6242) is not deformed, the pressure on the flange edge between the two pressure rollers (61) is in an uninterrupted state.

5. The sill inner plate flange edge straightening fixture according to claim 4, characterized in that, The pressure roller (61) is made of rubber. When the pressure roller (61) applies pressure to the flange edge, the pressure roller (61) is in a deformed state, so that the flange edge is in an interference squeeze state of non-pressure thinning.

6. The sill inner plate flange edge straightening fixture according to claim 1, characterized in that, The axial direction of the air pipe (621) is parallel to the conveying direction of the inner sill plate (2). The air pipe (621) has a number of air holes (6211) at equal intervals along its axial direction. A heated area is formed between two air pipes (621). When the hot air enters the heated area, the heated area is in a preheated state, so that the flange edge is fully preheated before being pressed by interference.

7. The sill inner plate flange edge straightening fixture according to claim 2, characterized in that, The air chamber (623) is provided with a cooling structure (8) at the rear for rapid cooling after the flange edge is pressurized to maintain its shape.

8. The sill inner plate flange edge straightening fixture according to claim 7, characterized in that, The cooling structure (8) has a valve body (81) and a valve block (82) disposed therein. The valve body (81) has a first air passage (811) facing the flange edge, and the valve block (82) has a second air passage (821) that can communicate with the first air passage (811). When the air pipe (621) circulates air to the valve block (82), the second air passage (821) connects to the first air passage (811), so that the flange edge can be cooled immediately while being heated and subjected to interference compression.

9. The sill inner plate flange edge straightening fixture according to claim 8, characterized in that, A pressure-receiving component (83) is provided between the valve block (82) and the air outlet of the air pipe (621). A reset spring (84) is provided between the pressure-receiving component (83) and the air chamber (623). When the reset spring (84) is not compressed, the first air passage (811) is in a closed state.

10. The sill inner plate flange edge straightening fixture according to claim 1, characterized in that, The frame (1) is provided with a support plate (11) for the installation of the first pressure component (6) and the second pressure component (7). The support plate (11) is provided with an elastic valve (111) on the upper and lower sides of the flange side corresponding to the inner sill plate (2) and a pressure sensor (112) connected thereto. The pressure sensor (112) is electrically connected to the corresponding thermo-pressure driver (62).

Images