A bending and turnover mechanism

Abstract

The application relates to a bending and overturning mechanism, which comprises a fixed die, a movable die capable of moving towards the fixed die, a punch arranged on the movable die, a shaping mechanism arranged on the side close to the movable die of the fixed die, a fixed seat, two symmetrically arranged sliding blocks in a curved sliding groove and corresponding elastic members, the sliding block has a material bearing plane, the material bearing planes of the two sliding blocks are coplanar to form a placing plane in a non-working state, and the punch pushes the metal plate to bend and drives the sliding blocks to move along the curved groove in a working state. The bending and overturning mechanism synchronously deforms the sliding blocks with the metal plate due to the above-mentioned structural design, effectively solves the plate scratch problem in traditional bending, and improves the forming quality and surface integrity.

Description

Technical Field

[0001] This utility model relates to bending mechanisms, and more particularly to a bending and flipping mechanism. Background Technology

[0002] The bending and forming process of sheet metal is widely used in sheet metal processing, automobile manufacturing, and home appliance housings. In actual production, to manufacture sheet metal parts with complex geometries, automated bending equipment with multi-angle bending capabilities is often required. As product requirements for appearance quality and structural precision continue to increase, issues such as material surface protection, shape control, and forming efficiency during the bending process are receiving increasing attention from the manufacturing industry.

[0003] Traditional bending structures generally use a pressure bending mechanism, whose main structure includes a fixed die (stationary die), a movable die (moving die), and a punch set on the moving die, which works with the punch to apply pressure and bend the metal sheet.

[0004] However, in existing pressure-type bending mechanisms, there is significant contact friction between the metal sheet and the die or limiting components during operation, especially during the bending and release processes. This easily leads to scratches and abrasions on the sheet surface, severely affecting product surface quality. To address this, some technical solutions have attempted to reduce frictional damage through die surface coatings and the addition of cushioning pads, but these methods still cannot completely eliminate scratches caused by sliding contact during bending. Therefore, there is an urgent need to propose a novel bending mechanism to solve these problems. Utility Model Content

[0005] The purpose of this utility model is to provide a bending and flipping mechanism that reduces the friction between the mold and the sheet metal during the punching process, so as to avoid product scratches.

[0006] The technical solution adopted by this utility model to solve the above problems is: a bending and flipping mechanism for bending metal plates, comprising:

[0007] Fixed mold;

[0008] The moving mold moves in a controlled manner toward or away from the fixed mold;

[0009] A punch is disposed on the side of the moving mold closer to the fixed mold;

[0010] Styling agencies, including:

[0011] A fixed base is provided on the side of the fixed mold close to the moving mold. Two symmetrically arranged sliding grooves are provided on the side of the fixed base away from the fixed mold. The inner wall of the sliding groove is a curved surface structure.

[0012] Two sliders, each including a material-receiving surface, are respectively disposed within two sliding grooves.

[0013] The two sliders are symmetrically arranged, and the axis of symmetry of the two sliders is coaxial with the axis of symmetry of the two sliding grooves. The sliders are configured to slide in the sliding grooves and rotate around the center of the curved surface structure when the shaping mechanism is in working state.

[0014] The elastic element consists of two sets, each set corresponding to one of the two sliders. The elastic element is positioned between the slider and the fixed base and applies pressure to the slider to suppress the pulling force of movement.

[0015] When the molding mechanism is not in operation, the material-bearing planes of the two sliders are coplanar to form a placement plane for placing the metal plate. When the molding mechanism is in operation, the punch abuts against the metal plate placed on the placement plane, applies pressure to the metal plate, causes the metal plate to bend, and causes the two sliders to move in the corresponding sliding grooves.

[0016] Preferably, when the shaping mechanism is in operation, the punch at the contact point with the metal plate coincides with the orthographic projection of the symmetry axis of the two sliders onto the metal plate.

[0017] Preferably, a preset gap is left between the two opposing sides of the sliders.

[0018] Preferably, the shaping mechanism further includes connectors, and there are two sets of connectors, with each set of connectors corresponding to one of the two sliders, and the connectors are fixedly connected to the sliders.

[0019] The elastic element is a spring, one end of which is connected to the connecting member, and the other end of which is connected to the fixed base.

[0020] Preferably, the punch is detachably connected to the moving die.

[0021] Preferably, the side of the slider away from the material-bearing plane has an arc surface structure, and the radius of the arc surface structure is the same as the radius of the curved surface structure.

[0022] Preferably, each of the two sliders is provided with a first limiting structure on its opposite sides, and the fixed seat is provided with a second limiting structure on the side away from the fixed mold. The first limiting structure is configured such that when the molding structure is in a non-working state, the elastic element applies a pulling force to the slider, causing the first limiting structure to abut against the second limiting structure, so that the material-bearing planes of the two sliders are coplanar.

[0023] Preferably, the guiding mechanism includes:

[0024] A bushing is disposed on the side of the fixed mold close to the moving mold, and the axis of the bushing is parallel to the moving direction of the moving mold;

[0025] A guide shaft is disposed on the side of the moving mold near the fixed mold, and the guide shaft is movably inserted into the bushing.

[0026] The beneficial effects of the embodiments of this utility model are as follows:

[0027] 1. Because the present invention adopts a shaping mechanism on the fixed mold, the shaping mechanism includes a sliding groove with a curved inner wall structure, symmetrically arranged sliders, and an elastic element that applies a suppressing force to the sliders, so that the sliders can automatically rotate along the sliding groove to cooperate with the bending process of the metal sheet when the sheet is deformed by the punch. Therefore, it effectively solves the problem that the metal sheet is easily scratched by the mold structure during the pressing process of the bending mechanism in the prior art, and thus achieves the technical effect of significantly improving the surface quality of the sheet and avoiding scratches while ensuring the bending forming accuracy.

[0028] 2. By employing a first limiting structure on the opposite sides of the two sliders and a corresponding second limiting structure on the fixed base, the tension applied by the elastic element when the molding mechanism is not in operation can cause the first and second limiting structures to abut against each other, thereby forcibly ensuring that the material-bearing planes of the two sliders are in a coplanar state. Therefore, it effectively solves the problems of inconsistent initial positioning of sliders and unstable support planes in the prior art, thereby achieving consistent positional accuracy and stability of the initial support surface during the placement of metal sheets, and improving the positioning accuracy and process reliability before bending. Attached Figure Description

[0029] Figure 1 This is a schematic structural diagram of the bending and flipping mechanism in a non-working state according to one embodiment of the present invention.

[0030] Figure 2 This is a schematic structural diagram of the bending and flipping mechanism in working state according to one embodiment of the present invention.

[0031] Figure 3 This is a schematic structural diagram of the fixing seat proposed in one embodiment of the present utility model.

[0032] Figure 4 This is a schematic structural diagram of the slider proposed in one embodiment of the present invention.

[0033] Among them: 10, fixed mold; 20, moving mold; 30, punch; 40, molding mechanism; 410, fixed base; 411, sliding groove; 412, second limiting structure; 420, slider; 421, material receiving plane; 422, first limiting structure; 423, arc surface structure; 430, elastic element; 440, connecting element; 50, guiding mechanism; 510, bushing; 520, guide shaft; 60, metal plate. Detailed Implementation

[0034] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0035] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] Please see Figures 1 to 4 A preferred embodiment of this application provides a bending and flipping mechanism for performing scratch-free bending of a metal sheet 60, which is suitable for industrial scenarios with high requirements for forming accuracy and surface quality, such as sheet metal manufacturing, automotive parts forming, and home appliance casing processing.

[0038] The bending and turning mechanism includes a fixed mold 10, a moving mold 20, a punch 30, and a shaping mechanism 40. The components have clearly defined structures and close cooperation, working together to precisely bend and turn the metal sheet. The moving mold 20 moves in a controlled manner towards or away from the fixed mold 10; the punch 30 is located on the side of the moving mold 20 closest to the fixed mold 10; the shaping mechanism 40 includes a fixed base 410, two sliders 420, and an elastic element 430. The fixed base 410 is located on the side of the fixed mold 10 closest to the moving mold 20. On the side of the fixed base 410 away from the fixed mold 10, two symmetrically arranged sliding grooves 411 are formed. The inner walls of the sliding grooves 411 are curved. Each slider 420 includes a receiving plane 421. The two sliders 420 are respectively disposed within the two sliding grooves 411, symmetrically arranged, and their axes of symmetry are coaxial with the axes of symmetry of the two sliding grooves 411. The sliders 420 are configured within the shaping mechanism 40. When in working condition, it slides within the sliding groove 411 and rotates around the center of the curved structure. There are two sets of elastic elements 430, each corresponding to one of the two sliders 420. The elastic elements 430 are disposed between the sliders 420 and the fixed seat 410, and apply pressure to the sliders 420 to suppress the pulling force of movement. When the molding mechanism 40 is not in working condition, the material-bearing planes 421 of the two sliders 420 are coplanar to form a placement plane for placing the metal plate 60. When the molding mechanism 40 is in working condition, the punch 30 abuts against the metal plate 60 placed on the placement plane, applies pressure to the metal plate 60, causing the metal plate 60 to bend, and causing the two sliders 420 to move within the corresponding sliding grooves 411.

[0039] Specifically:

[0040] The fixed mold 10 is a stationary support mold that serves as a reaction force reference for the placement and forming of the metal sheet 60. The moving mold 20 is located on the opposite side of the fixed mold 10 and can be moved in a controlled vertical direction toward or away from the fixed mold 10 via an external drive device. The punch 30 is located on the side of the moving mold 20 closer to the fixed mold 10, and its downward pressing direction toward the fixed mold 10 is consistent with the bending direction of the metal sheet 60.

[0041] The molding mechanism 40 is located on the side of the fixed mold 10 near the moving mold 20. As an auxiliary molding component, it includes a fixed base 410, two sliders 420, and two sets of elastic elements 430. The fixed base 410 is fixedly connected to the structure of the fixed mold 10, and two symmetrically arranged sliding grooves 411 are provided on its side away from the fixed mold 10. The inner wall of the sliding groove 411 is a curved surface structure, and the curvature is designed based on the molding accuracy. Its center is located at the rotation center point of the slider 420's movement trajectory, forming an arc guide mechanism 50.

[0042] Two sliders 420 are respectively disposed in two sliding grooves 411, symmetrically arranged, and their axis of symmetry is coaxial with the axis of symmetry of the sliding grooves 411. Each slider 420 has a material-bearing plane 421 for supporting the metal plate 60. When the molding mechanism 40 is not under force, the material-bearing planes 421 of the two sliders 420 remain coplanar, thereby forming a stable placement platform. The sliders 420 can slide guided in the sliding grooves 411, and when subjected to the reaction force of the punch 30 pressing the metal plate 60, they automatically rotate along the arc trajectory of the curved surface structure, thereby cooperating with the metal plate 60 to produce bending and forming.

[0043] A set of elastic elements 430 is provided between each slider 420 and the fixed base 410. The elastic element 430 is preferably a helical tension spring or elastic arm with linear tensile characteristics, which can continuously apply a pulling force to the slider 420 inward, suppress its loosening displacement when there is no external force, and provide appropriate elastic buffering during the process of slider 420 flipping with the plate, so that slider 420 can rotate smoothly and in a controlled manner after being subjected to force, avoiding structural impact and error accumulation.

[0044] During operation, after the metal sheet 60 is placed on the coplanar bearing plane 421 formed by the two sliders 420, the moving mold 20 controls the punch 30 to move downwards. The punch 30 contacts the metal sheet 60 and gradually applies pressure, causing the metal sheet 60 to bend downwards on the sliders 420. During this process, the two sliders 420 slide outwards along the sliding groove 411 due to the reaction force of the deformation of the metal sheet 60, and rotate around the center under the guidance of the curved surface structure, thereby adhering to and guiding the synchronous deformation of the metal sheet 60. The rotation trajectory of the sliders 420 matches the deformation path of the sheet metal, minimizing relative sliding of the metal sheet 60 and die scratches during the bending process.

[0045] This structure is particularly suitable for production environments with extremely high requirements for sheet metal surface quality. It is recommended for use in high-precision processing such as oil-free dry bending, mirror panel processing, and bending of metal sheets with protective films. This mechanism has low space requirements and can be installed on conventional hydraulic or mechanical bending equipment, exhibiting good compatibility and adaptability for modification.

[0046] In this embodiment, a molding mechanism 40 with a curved guide structure is set on the side of the fixed mold 10, and symmetrical sliders 420 and elastic elements 430 are configured. The sliders 420 rotate and cooperate with the metal sheet 60 under the drive of the punch 30. Therefore, the problem of sheet metal scratches caused by sliding contact in the prior art is effectively solved, thereby achieving the technical effect of improving the surface integrity and forming quality of the sheet metal while ensuring bending accuracy.

[0047] Please see Figures 1 to 2To further improve the performance of the bending and turning mechanism in terms of forming accuracy and deformation coordination, and to optimize the structural layout and stamping path relationship of the shaping mechanism 40, in some embodiments, the following structural relationship is set: when the shaping mechanism 40 is in working state, that is, during the process of the punch 30 contacting the metal plate 60 and applying downward pressure for bending and forming, the contact position between the punch 30 and the metal plate 60 is set to coincide with the orthogonal projection position of the symmetry axis of the two sliders 420 on the surface of the plate; at the same time, a preset gap is left between the two sliders 420 facing opposite sides.

[0048] Specifically:

[0049] During its downward pressing process, the punch 30 will make direct contact with the metal plate 60 located above the material-bearing plane 421 of the two sliders 420. By setting the line of action of the punch 30 to coincide with the projection position of the axis of symmetry of the sliders 420, its punching force is aligned with the center line of the two sliders 420 in the spatial structure, thereby making the force distribution more uniform and symmetrical, and avoiding the instability of the sliders 420 or the skew of the plate due to eccentric loading.

[0050] Furthermore, a gap of a certain size is designed between the two sliders 420 on opposite sides, which is preset according to the sheet thickness, tolerance, and bending stroke. The purpose of the preset gap is twofold: firstly, to prevent the two sliders 420 from contacting and colliding with each other when the punch 30 applies downward pressure, thus avoiding structural interference; secondly, to form a certain deformation buffer zone, allowing the sheet to obtain a smoother guiding bending path in the initial deformation stage, further reducing the friction area between the sliders 420 and the sheet, and improving forming flexibility.

[0051] This structure is particularly suitable for high-precision sheet metal bending applications where consistent punching pressure lines are required and precise control of the slider's 420° movement trajectory is necessary, such as aerospace-grade alloy sheet forming and automotive high-strength steel hot forming. Its installation requirements are comparable to conventional flip-plate molds, allowing for direct integration into standard mold base systems. It is highly adaptable and requires no additional modifications.

[0052] In this embodiment, by setting the contact position of the punch 30 to coincide with the orthographic projection of the axis of symmetry of the two sliders 420, and by providing a preset gap between the opposite sides of the sliders 420, the problem of asynchronous movement of the sliders 420, asymmetrical bending of the sheet metal, and contact interference of the sliders 420 caused by the force offset of the punch 30 in the existing bending mechanism is effectively solved. This results in higher bending accuracy, stronger motion coordination, and longer device life.

[0053] Please see Figures 1 to 2In some embodiments, the shaping mechanism 40 further includes a connector 440 for reliably connecting the elastic element 430 to the slider 420 and achieving precise force transmission. There are two sets of connectors 440, each corresponding to one of the two sliders 420. Each set of connectors 440 is fixedly connected to its corresponding slider 420, preferably using mechanical fastening or structural riveting to ensure a firm and reliable connection and prevent loosening or displacement during deformation under stress. The elastic element 430 is a spring, with one end connected to the connector 440 and the other end connected to the fixing seat 410.

[0054] Specifically:

[0055] The connector 440 is preferably disposed on the side of the slider 420 away from the material receiving plane 421, forming an integral structure with the slider 420. The connector 440 may be a rectangular plate, a trunnion, or a connecting arm with perforated reinforcing ribs. Its length direction is approximately perpendicular to the movement direction of the slider 420 in the sliding groove 411, which facilitates linear docking with the spring.

[0056] In this embodiment, the elastic element 430 is specifically a tension helical spring that is subjected to tension. One end of the spring is connected to the connector 440, and the other end is fixed to the preset mounting hole on the fixing base 410, forming a tension state between the two.

[0057] In the non-working state, the spring is in a pre-stretched state, continuously applying an inward restoring force to the slider 420, keeping it in its initial position. This ensures that the material-bearing surfaces 421 of the two sliders 420 are coplanar, forming a stable platform for placing the metal sheet 60. When the punch 30 begins to press down and the molding mechanism 40 enters the working state, as the metal sheet 60 deforms under pressure, the slider 420 overcomes the spring tension and slides outward under the impact load. Because the spring is connected to the slider 420 through the connector 440, the force path is clear and symmetrical, and the elastic restoring force remains balanced throughout the sliding process. This provides smooth sliding damping and allows the slider 420 to automatically reset and return to its placement state after the load is released.

[0058] This structure is suitable for automated folding die systems operating under frequent start-up and heavy-duty stamping conditions, and has broad application prospects, especially in high-speed sheet metal stamping lines, automotive body panel molds, and bending of metal housings for home appliances. The overall system structure is compact, and the addition of connector 440 improves the spring installation accuracy and shear strength, while also facilitating later maintenance and replacement. The spring selection can also be matched and adjusted according to different sheet thicknesses and load characteristics.

[0059] In this embodiment, by adopting a connecting member 440 between the slider 420 and the fixed base 410, and by fixing the connecting member 440 to the slider 420, the spring can apply a stable pulling force to the slider 420 through a clear force transmission path. Therefore, it effectively solves the problem of the slider 420 losing control of its movement due to uneven force on the elastic element 430 or poor connection in the existing bending and flipping structure. This achieves the technical effect of smooth slider 420 movement, convenient structural installation, and stable and reliable overall forming process.

[0060] Please see Figures 3 to 4 In some further embodiments of this application, in order to ensure that the two sliders 420 are always in a stable and symmetrical initial position when not in operation, and to avoid affecting the stability of the sheet material placement and the initial bending accuracy due to positional deviation, a limiting structure is provided in the molding mechanism 40 to precisely constrain the position of the sliders 420. A first limiting structure 422 is provided on the opposite sides of the two sliders 420, and a second limiting structure 412 is constructed on the side of the fixed seat 410 away from the fixed mold 10. The first limiting structure 422 is configured such that when the molding structure is not in operation, the tension applied by the elastic member 430 to the sliders 420 causes the first limiting structure 422 to abut against the second limiting structure 412, making the material-bearing planes 421 of the two sliders 420 coplanar.

[0061] Specifically:

[0062] Two first limiting structures 422 are arranged symmetrically to each other and installed at the end or outside of the slider 420. They are preferably rigid bosses, positioning posts, limiting ears or stops, and their positioning surfaces are perpendicular to the sliding direction of the slider 420.

[0063] The second limiting structure 412 is fixedly installed in the corresponding limiting area of ​​the fixed base 410, preferably an embedded limiting block, an elastic buffer column or a positioning slot, and is used to form a stop boundary when the slider 420 returns to its original position.

[0064] When the molding mechanism 40 is in a non-working state, i.e., before the punch 30 applies a bending load to the metal sheet 60, under the pull-back action of the elastic element 430, the two sliders 420 slide inward along the sliding groove 411 until their respective first limiting structures 422 contact the corresponding second limiting structures 412. At this time, the movement of the two sliders 420 is precisely limited, and their material-bearing planes 421 automatically align, forming a stable placement surface for the metal sheet 60. Through the cooperation of the above-mentioned limiting structures, initial planar deviations caused by inconsistent return accuracy of the elastic element 430 or asymmetrical movement paths of the sliders 420 are avoided.

[0065] In actual operation, after the punch 30 applies pressure to the metal plate 60, the plate, due to its deformation tendency, pushes the slider 420 to slide outward along the sliding groove 411, and the two limiting structures separate. After forming is completed, as the punch 30 is lifted and unloaded, the elastic element 430 pulls the slider 420 back to the contact state of the limiting structure, achieving reset and alignment of the common surfaces. This limiting structure plays a key role in multiple stages, including the initial forming, process response, and end reset, ensuring the consistency of the position of the material-bearing plane 421 and the stability of the system operation.

[0066] This structure is particularly suitable for automated sheet metal bending scenarios requiring high repeatability and precision, especially in unattended, multi-batch repetitive positioning tasks. It offers significant advantages in reducing installation and debugging complexity, improving starting position accuracy, and avoiding manual intervention. The limiting structure is composed of rigid components, possessing excellent structural lifespan and impact resistance. It adapts to various high-speed, frequent-start industrial environments, has a wide applicable temperature range, low environmental humidity requirements, and facilitates integration with general-purpose mold systems.

[0067] In this embodiment, by setting a first limiting structure 422 on the opposite sides of the two sliders 420 and setting a second limiting structure 412 on the side of the fixed seat 410 away from the fixed mold 10, the elastic element 430 can accurately pull the sliders 420 back to the coplanar limiting position when not in operation. Therefore, it effectively solves the problems of inconsistent initial positioning of sliders 420 and inaccurate placement plane in existing bending mechanisms, thereby achieving the technical effects of improving the positioning accuracy of metal plate 60 placement process, consistent control of the initial bending state, and overall stability of equipment operation.

[0068] Please see Figures 3 to 4 To further optimize the motion coordination of the slider 420 in the sliding groove 411 and improve the dynamic response accuracy of the shaping mechanism 40 during the bending process of the metal sheet 60, in some embodiments, the side of the slider 420 away from the material-bearing plane 421 is an arc surface structure 423, the radius of the arc surface structure 423 is the same as the radius of the curved surface structure, and the two share a common center of rotation.

[0069] Specifically:

[0070] The slider 420, as a key component supporting and guiding the deformation of the metal sheet, is symmetrically arranged and has a support plane 421 for supporting the metal sheet 60. This plane is coplanar with another slider 420 when the molding mechanism 40 is not loaded. The side of the slider 420 facing away from the support plane 421 is designed as an outer arc structure. The outer arc profile is a partially circular arc cross section, which forms the contact guide surface of the slider 420 in the sliding groove 411. The inner wall of the sliding groove 411 is also a matching arc surface structure 423, whose curvature is consistent with the outer arc of the slider 420, thereby forming a double-arc surface fitting guide rail relationship during the movement of the slider 420.

[0071] When the punch 30 applies bending pressure to the metal plate 60, the metal plate 60 deforms downwards, causing the two sliders 420 to slide symmetrically along the sliding groove 411. Since the outer arc of the slider 420 and the inner arc of the sliding groove 411 have the same curvature, the slider 420 can complete a rotational motion around the same center under the guidance of its inner wall, thus achieving natural coordination with the forming trajectory of the metal plate 60. This combined sliding and rotating trajectory not only ensures no interference between the slider 420 and the metal plate 60 during the forming process but also effectively disperses the load through the arc surface support, improving the dynamic stability and fatigue life of the structure.

[0072] Furthermore, the curved surface structure 423 can be integrally formed through CNC machining, possessing high symmetry and geometric precision, and can adapt to various high-speed stamping and high-precision bending operations. The slider 420 can be made of cemented carbide steel, polyetheretherketone, or composite wear-resistant materials, and the outer curved surface can be polished or coated with a low-friction coating to further reduce friction loss during the forming process. This structure is suitable for various working conditions requiring multiple bending cycles, large stroke guidance, and high trajectory control, such as precision edge bending of household appliance shells and forming of automotive reinforcing ribs.

[0073] In this embodiment, by adopting a technique in which the side of the slider 420 away from the material-bearing plane 421 is an arc-shaped structure 423, and the radius of the arc-shaped structure 423 is consistent with the radius of curvature of the inner wall of the sliding groove 411, the problems of unstable movement, force line deviation and frictional resistance of the existing slider 420 structure in the guide rail are effectively solved. Thus, the technical effects of highly synchronized movement path and bending trajectory of slider 420, smoother structural response, and significantly improved forming efficiency and precision are achieved.

[0074] Please see Figures 1 to 2 To improve the structural stability and guiding accuracy of the bending and flipping mechanism during the bending process, and to prevent the moving die 20 from shifting or tilting laterally during movement, thereby affecting the alignment accuracy between the punch 30 and the metal plate 60, the bending and flipping mechanism is further provided with a guiding mechanism 50. In some embodiments, the bending and flipping mechanism further includes a guiding mechanism 50, which includes a bushing 510 and a guide shaft 520, forming a high-precision linear fit structure. The bushing 510 is located on the side of the fixed die 10 near the moving die 20, and the axis of the bushing 510 is parallel to the moving direction of the moving die 20; the guide shaft 520 is located on the side of the moving die 20 near the fixed die 10, and the guide shaft 520 is movably inserted into the bushing 510.

[0075] Specifically:

[0076] The bushing 510 is fixedly installed on the side of the fixed mold 10 near the moving mold 20, serving as a guide support structure. Its mounting surface is flush with or slightly higher than the main body of the fixed mold 10, preferably integrally machined or connected by a high-strength mechanical connection. The axis of the bushing 510 is set vertically and strictly parallel to the vertical movement direction of the moving mold 20. Its inner wall circular hole is subjected to high-precision grinding, and the inner diameter tolerance is controlled within the micrometer level to ensure guiding accuracy.

[0077] The guide shaft 520 is fixedly connected to the side of the moving die 20 near the fixed die 10 and extends toward the fixed die 10, movably inserted into the inner hole of the bushing 510. The guide shaft 520 and the bushing 510 maintain a sliding fit, which can be a clearance fit, a transition fit, or a self-lubricating bushing can be added to optimize friction performance. During the reciprocating motion of the moving die 20, the guide shaft 520 slides linearly along the inner cavity of the bushing 510, achieving dynamic constraint on the translational direction of the moving die 20, ensuring that the punch 30 always stays within the set stroke path, thereby ensuring the consistency of the position of the punch 30 and the metal sheet 60 during the stamping process.

[0078] During operation, when the moving die 20 moves downward under the control of the drive system, the guide shaft 520 simultaneously inserts downward into the bushing 510, forming a complete guide path; after the stamping is completed, the moving die 20 rises, and the guide shaft 520 disengages from the bushing 510 and moves upward. Since the guide structure is located between the fixed die 10 and the moving die 20 and is parallel to the mounting surface of the punch 30, the guide constraint force can effectively counteract the lateral disturbances caused by the off-center load of the punch 30, the slide rail clearance, or external interference.

[0079] The guide mechanism 50 is suitable for automated bending processes requiring large stroke, high load, and high precision. Its effectiveness is particularly pronounced when the punch 30 has a long structure or the equipment frame is highly flexible. Its installation position is flexible and its structure is compact, without affecting the layout of the molding mechanism 40 and other functional components. Furthermore, it can be easily replaced using standard parts or modular components, facilitating future maintenance.

[0080] In this embodiment, a guiding mechanism 50 is adopted, consisting of a bushing 510 on the fixed mold 10 and a guide shaft 520 on the moving mold 20. The guide shaft 520 can be movably inserted into the bushing 510 to form a high-precision linear guiding fit. Therefore, the problems of easy lateral displacement of the moving mold 20 and large alignment error between the punch 30 and the plate are effectively solved in the existing bending and turning device. This achieves the technical effects of improving the movement stability of the moving mold 20, enhancing bending accuracy, and improving the overall reliability of the device.

[0081] To enhance the modularity and ease of maintenance of the device, a detachable connection structure is adopted between the punch 30 and the moving die 20. In some embodiments, the punch 30 and the moving die 20 are detachably connected. This connection method allows the punch 30 to be replaced, disassembled, adjusted, or maintained according to different working conditions, effectively adapting to the bending process requirements of various types of metal sheet 60.

[0082] Specifically:

[0083] The moving die 20 is provided with a mounting surface for mounting the punch 30. This mounting surface is preferably located on the side of the moving die 20 facing the fixed die 10, and is fixed to the punch 30 body via several mechanical connection holes or grooves. The punch 30 has a connecting part that mates with the mounting surface. This connecting part can be a planar structure, a dovetail groove structure, a T-shaped slider 420 structure, etc., depending on the structure of the moving die 20 and the stamping requirements. Reliable fixing is achieved between the two through bolt connections, pin insertion, or quick-clamping mechanisms. Alternatively, anti-displacement components such as limit blocks and anti-loosening washers can be used as needed to ensure the stability of the punch 30 under impact loads.

[0084] After the punch 30 is connected to the moving die 20, the entire stamping action is driven by the moving die 20, which drives the punch 30 to perform a vertical stamping action on the metal sheet 60. When it is necessary to replace the punch 30 to adapt to different sheet thicknesses, bending angles or special structures, the punch 30 can be disassembled simply by removing the corresponding connecting parts. There is no need to disassemble the moving die 20 body or replace the entire die structure, which significantly improves the flexibility and maintenance efficiency of the equipment.

[0085] In this embodiment, by adopting a detachable connection between the punch 30 and the moving die 20, the punch 30 can be flexibly replaced, quickly installed, and adapted to different bending requirements. Therefore, it effectively solves the problems of cumbersome operation and poor adaptability in the existing bending mechanism for replacing the punch 30, thereby achieving the technical effects of improving the modularity of the device, enhancing maintenance efficiency, and improving compatibility with multiple specifications of processes.

[0086] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.

Claims

1. A bending and flipping mechanism for bending metal sheets, characterized in that, include: Fixed mold; The moving mold moves in a controlled manner toward or away from the fixed mold; A punch is disposed on the side of the moving mold closer to the fixed mold; Styling agencies, including: A fixed base is provided on the side of the fixed mold close to the moving mold. Two symmetrically arranged sliding grooves are provided on the side of the fixed base away from the fixed mold. The inner wall of the sliding groove is a curved surface structure. Two sliders, each slider having a material-bearing plane, are respectively disposed in two sliding grooves. The two sliders are symmetrically arranged, and the axes of symmetry of the two sliders are coaxial with the axes of symmetry of the two sliding grooves. The sliders are configured to slide within the sliding grooves and rotate around the center of the curved surface structure when the molding mechanism is in working state. The elastic element consists of two sets, each set corresponding to one of the two sliders. The elastic element is disposed between the slider and the fixed seat and applies pressure to the slider to suppress the movement of the slider. When the molding mechanism is not in operation, the material-bearing planes of the two sliders are coplanar to form a placement plane for placing the metal plate. When the molding mechanism is in operation, the punch abuts against the metal plate placed on the placement plane, applies pressure to the metal plate, causes the metal plate to bend, and causes the two sliders to move in the corresponding sliding grooves.

2. The bending and flipping mechanism according to claim 1, characterized in that, When the shaping mechanism is in operation, the punch at the contact point with the metal plate coincides with the orthographic projection of the symmetry axis of the two sliders onto the metal plate.

3. The bending and flipping mechanism according to claim 1, characterized in that, A preset gap is left between the two opposing sides of the sliders.

4. The bending and flipping mechanism according to claim 1, characterized in that: The shaping mechanism also includes connectors, and there are two sets of connectors. The two sets of connectors correspond one-to-one with the two sliders, and the connectors are fixedly connected to the sliders. The elastic element is a spring, one end of which is connected to the connecting member, and the other end of which is connected to the fixed base.

5. A bending and flipping mechanism according to claim 1, characterized in that, The punch is detachably connected to the moving mold.

6. The bending and flipping mechanism according to claim 1, characterized in that, The slider has an arc-shaped structure on the side away from the material-bearing plane, and the radius of the arc-shaped structure is the same as the radius of the curved surface structure.

7. A bending and flipping mechanism according to claim 1, characterized in that, Both sliders are provided with a first limiting structure on opposite sides, and the fixed seat is provided with a second limiting structure on the side away from the fixed mold. The first limiting structure is configured such that when the molding mechanism is in a non-working state, the elastic element applies a pulling force to the slider, causing the first limiting structure to abut against the second limiting structure, so that the material bearing planes of the two sliders are coplanar.

8. A bending and flipping mechanism according to claim 1, characterized in that, It also includes a guiding mechanism, which comprises: A bushing is disposed on the side of the fixed mold close to the moving mold, and the axis of the bushing is parallel to the moving direction of the moving mold; A guide shaft is disposed on the side of the moving mold near the fixed mold, and the guide shaft is movably inserted into the bushing.

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