A stretch-drawing die for a cable car car body profile

Abstract

The application provides a drawing and bending die for a cable car profile, comprising a die mounting table, a flexible contact plate and a profile adjusting unit. The profile has at least a first curvature and a second curvature along the length direction, and the second curvature is larger. The flexible contact plate is provided with a first deformation area and a second deformation area correspondingly. The flexible contact plate is supported and the curvature is adjusted by the profile adjusting unit. In the initial stage of drawing and bending, both deformation areas are adjusted to the first curvature. After the whole profile reaches the first curvature, the profile adjusting unit drives the second deformation area to gradually deform to the second curvature, and the corresponding area of the profile synchronously follows, and is supported all the time. The application realizes the continuous forming of the variable curvature profile in the same stroke through the partitioned matching shape preserving and dynamic profile adjusting unit, eliminates the joint marks and positioning errors of segmented processing, adopts the multi-point independent driving differential support, ensures the uniform deformation of the transition area, avoids the cross-section distortion and uneven springback, and realizes the low friction sliding of the floating metal belt in cooperation with the graphite column array.

Description

Technical Field

[0001] This invention belongs to the field of bending die technology, specifically referring to a bending die for cable car cabin profiles. Background Technology

[0002] In the industrial manufacturing of cable car cabins, to balance structural mechanical performance and aerodynamic appearance, the aluminum alloy frame profiles are typically designed as complex spatial curves with continuously varying curvature along their length. For example, the top beam of the cabin often requires a gentle middle section, while the ends connecting to the columns need to be sharply bent to achieve a smooth connection. Currently, such variable curvature profiles are generally formed using a stretch bending process. The core of this process is to clamp both ends of the profile in a stretching cylinder, and under axial tension, force the profile to conform to the surface and undergo plastic bending around a mold working surface with a specific curvature.

[0003] However, most existing bending dies are integral rigid structures with a fixed curvature of the working surface, which can only form profiles with a single radius of curvature. When faced with the aforementioned profiles with varying curvature, if the profile is forcibly bent on a single-curvature die, the small curvature section will suffer severe springback due to insufficient deformation, while the large curvature section will experience cross-sectional distortion or wrinkling of the inner wall due to excessive thinning, making it difficult to guarantee dimensional accuracy. To complete the forming of the variable curvature, some processes use segmented multiple clamping bending, but the tool marks and angle deviations introduced by the secondary positioning damage the smoothness of the profile's appearance. Furthermore, the sudden curvature change in the transition zone is prone to stress concentration, and the outer surface of the profile and the rigid working surface of the die experience severe relative sliding during the bending process. The oxide layer on the aluminum alloy surface is easily scratched and roughened, requiring extensive grinding and repair afterward, increasing manufacturing costs and time. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a bending die for cable car cabin profiles, so as to at least partially solve the problems mentioned in the background art.

[0005] The technical solution adopted in this invention is as follows: A bending die for cable car cabin profiles is proposed, comprising: A mold mounting platform is installed on a bending machine. A flexible contact plate is disposed above the mold mounting platform and provides support on the inside of the bent portion when the profile is bent. The shaping unit is installed on the mold mounting platform and can provide support force to the flexible contact plate; The profile bends along its length with at least two curvatures, including a first curvature and a second curvature, with the second curvature being greater than the first curvature. The flexible contact plate includes a first deformation zone and a second deformation zone respectively provided along the length direction corresponding to the first curvature and the second curvature of the profile bend. At least one of the first deformation zone and the second deformation zone is provided. The flexible contact plate is constructed to adjust its curvature shape under the support of the shaping unit. In the initial stage of profile bending, the curvature of both the first deformation zone and the second deformation zone is adjusted to the first curvature. When the overall curvature of the profile reaches the first curvature, the second deformation zone is gradually deformed from the first curvature to the second curvature by the shaping unit, so that the corresponding area of ​​the profile follows the second deformation zone from the first curvature to the second curvature, and is always supported by the second deformation zone during the deformation process.

[0006] Furthermore, the shaping unit includes a first shaping unit and a second shaping unit. The first shaping unit is correspondingly disposed inside the first deformation region, and the second shaping unit is correspondingly disposed inside the second deformation region. At least one first shaping unit is disposed inside the first deformation region, and at least one second shaping unit is disposed inside the second deformation region. The first shaping unit is configured to maintain the curvature shape of the first deformation region, and the second shaping unit is configured to adjust the curvature of the second deformation region, and during the adjustment process, maintain the second deformation region to deform uniformly from the first curvature to the second curvature.

[0007] Furthermore, the first shaping unit includes a first hydraulic cylinder, a first contact module, and a first drive rod. The first hydraulic cylinder is fixedly installed on the top of the mold mounting platform. The first drive rod is disposed at the drive end of the first hydraulic cylinder. The first contact module is installed on the first drive rod and is attached to the inner wall of the first deformation zone. The first contact module is driven by the first drive rod to adjust its position following the bending of the profile.

[0008] Furthermore, the second shaping unit includes a second hydraulic cylinder, a second contact module, and a second drive rod. The second hydraulic cylinder is fixedly installed on the top of the mold mounting platform. The second drive rod is located at the drive end of the second hydraulic cylinder. The second contact module is installed on the second drive rod and is attached to the inner wall of the second deformation zone. The second contact module is driven by the second drive rod to adjust its position according to the curvature and position changes of the profile.

[0009] Furthermore, multiple second contact modules are provided on the inner side of the same second deformation zone, and each second contact module is controlled by an independent second drive rod. The multiple second contact modules jointly support the second deformation zone to maintain or adjust the curvature and position of the second deformation zone.

[0010] Furthermore, the contact surface between the second contact module and the second deformation zone is set as a contact surface, the contact surface is set as an arc surface, and the height of the contact surface is equal to the height of the second deformation zone. At least two second contact modules are provided inside each second deformation zone.

[0011] Furthermore, the first contact module is configured as an arc-shaped plate, and the curvature of the first contact module is the same as the curvature of the first deformation zone. At least one first contact module is provided on the inner side of each first deformation zone.

[0012] Furthermore, the upper and lower ends of the first contact module and the second contact module are fitted with limit clamps by bolts. The limit clamps protrude from the flexible contact plate in the horizontal direction to form a groove for accommodating the profile. The limit clamps are used to restrict the movement of the profile in the height direction. The top of the mold mounting table is provided with positioning holes distributed in a matrix. The bottoms of the first hydraulic cylinder and the second hydraulic cylinder are mounted on the mold mounting table through a positioning base.

[0013] Furthermore, the flexible contact plate includes a contact deformation band, an elastic connecting band, a self-lubricating band, and a floating metal band. The contact deformation band is attached to one side of the shaping unit, and the profile is attached to the outside of the floating metal band. The floating metal band is configured to slide relative to the self-lubricating band in a horizontal direction under force.

[0014] Furthermore, the contact deformation band has a serrated groove on the side facing the elastic connecting band, and multiple serrated grooves are evenly arranged along the length direction. The elastic connecting band is fixed between the contact deformation band and the self-lubricating band. Multiple graphite columns are installed on the self-lubricating band in a matrix distribution. The length of the flexible contact plate is greater than the length of the profile.

[0015] Beneficial effects: This invention divides the flexible contact plate into first and second deformation zones corresponding to the curvature segments of the profile, and equips them with conformal and dynamic adjustment units respectively. This achieves a step-by-step bending process of first uniformly shaping and then locally increasing the curvature, completing the continuous forming of the variable curvature profile within the same stroke. This eliminates tool marks and positioning errors from segmented processing. Furthermore, differential support is provided by a second contact module with multiple independently driven points, ensuring uniform deformation in the curvature transition zone and effectively avoiding cross-sectional distortion and uneven springback. The flexible contact plate also employs a multi-layer composite structure, combined with a graphite column array, allowing the floating metal strip to slide with low friction. This transforms the intense friction between the profile surface and the mold into internal, low-friction motion, greatly reducing the risk of scratches and protecting the surface quality of the aluminum alloy. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a bending die for cable car cabin profiles proposed in an embodiment of the present invention; Figure 2 This is a schematic diagram of a bending die for cable car cabin profiles in the first bending state, as proposed in an embodiment of the present invention. Figure 3 This is a schematic diagram of a bending die for cable car cabin profiles in the second bending state, according to an embodiment of the present invention. Figure 4 This is a three-dimensional structural diagram of the second shaping unit proposed in an embodiment of the present invention; Figure 5 A side view of the second shaping unit is provided as an embodiment of the present invention. Figure 6 A schematic diagram of the flexible contact plate proposed in an embodiment of the present invention is shown.

[0017] Among them, 10 is the mold mounting platform; 101 is the positioning hole; 20 is the shaping unit; 21 is the first shaping unit; 211 is the first hydraulic cylinder; 212 is the first contact module; 213 is the first drive rod; 22 is the second shaping unit; 221 is the second hydraulic cylinder; 222 is the second contact module; 2220 is the contact surface; 223 is the second drive rod; 23 is the limiting clamp; 231 is the bolt; 24 is the positioning base; 30 is the flexible contact plate; 301 is the first deformation zone; 302 is the second deformation zone; 31 is the contact deformation zone; 310 is the serrated groove; 32 is the elastic connecting strip; 33 is the self-lubricating strip; 331 is the graphite column; and 34 is the floating metal strip.

[0018] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0020] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments 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. Therefore, they should not be construed as limitations on the embodiments.

[0021] like Figure 1 As shown, this embodiment of the invention provides a bending die for cable car cabin profiles, including a die mounting platform 10, a shaping unit 20, and a flexible contact plate 30. The die mounting platform 10 is a metal base plate with sufficient rigidity and flatness. Its bottom surface is fixedly mounted on the worktable of the bending machine by a T-slot bolt assembly, which is used to support all other components of the die and transmit the power of the bending machine to the die.

[0022] The flexible contact plate 30 is a continuous strip-shaped assembly extending along the bending direction of the profile. It is arranged directly above the mold mounting platform 10 and spans the entire bending area of ​​the profile. During the bending process of the profile, the flexible contact plate 30 is always located on the inner side of the bending part of the profile, that is, the concave side. It provides a close and uniform support reaction force to the profile through its outer surface to prevent the profile from becoming unstable and wrinkling under compressive stress.

[0023] The shaping unit 20 consists of multiple sets of hydraulic actuators arranged along the length of the profile. These actuators are all fixedly installed on the upper surface of the mold mounting table 10, and their top movable ends can extend upward and abut against the inner wall of the flexible contact plate 30. In this way, according to the preset bending deformation path, the size and direction of the support force can be dynamically adjusted to different areas of the flexible contact plate 30, thereby actively controlling the local curvature shape of the flexible contact plate 30 and providing a precise variable bending working surface for the profile.

[0024] like Figure 2 and Figure 3 As shown, for the forming requirements of the cable car car profile having at least two different bending curvatures along its length direction, namely the first curvature and the second curvature, where the second curvature value is greater than the first curvature, representing a more severe degree of bending, the flexible contact plate 30 is logically divided into multiple functional sections in its own length direction, corresponding one-to-one with each bending segment of the profile.

[0025] In some embodiments, for regions on the profile that need to maintain a first curvature (i.e., a relatively gentle curve), the corresponding segment on the flexible contact plate 30 is defined as a first deformation region 301; for regions on the profile that need to be ultimately shaped into a second curvature (i.e., a more curved curve), the corresponding segment on the flexible contact plate 30 is defined as a second deformation region 302. Depending on the specific cross-sectional design of the profile, at least one first deformation region 301 and one second deformation region 302 are provided. For example, for a profile that is curved at both ends and gentle in the middle, two second deformation regions 302 can be provided at each end, with one first deformation region 301 in the middle.

[0026] It should be noted that each deformation zone belongs to the same continuous integral strip in terms of physical structure, without mechanical separation. However, they are functionally independent and are controlled separately by the corresponding shaping unit below, so that they can independently present different curvature shapes. Furthermore, at the junction of adjacent deformation zones, due to the continuity and elasticity of the flexible contact plate 30 itself, a smooth curvature transition surface can be naturally formed, avoiding the sharp edges or steps generated by the rigid segmented mold in the transition zone.

[0027] Furthermore, the flexible contact plate 30 is configured such that its overall or partial curvature shape depends entirely on the distribution of the support force applied thereon by the shaping unit 20. In the initial stage of the bending process, to facilitate the initial bonding of the profile as a whole and to ensure uniform tensile load bearing, all actuators of the shaping unit 20 operate in unison, adjusting the curvature of both the first deformation zone 301 and the second deformation zone 302 to the same value, i.e., the first curvature.

[0028] At this point, the entire flexible contact plate 30 presents as a uniform large-radius arc surface, equivalent to a traditional single-curvature mold. As the stretching cylinder of the bending machine continues to apply force, causing the overall bending degree of the profile to reach the first curvature and the inner wall of the profile to fully conform to the flexible contact plate 30, the control system issues a command to activate the shaping unit 20 (i.e., the second shaping unit 22) corresponding to the second deformation zone 302. These shaping units 20 gradually extend according to a preset displacement and time curve, applying an additional upward thrust to the second deformation zone 302, forcing the radius of curvature of this area to gradually and smoothly decrease from the first curvature to the second curvature.

[0029] Thus, the area on the profile corresponding to the second deformation zone 302 is forced to undergo further plastic bending under the continuous action of axial tensile bending force, following the curvature change of the mold surface in that area, i.e., deforming synchronously from the first curvature to the second curvature. Throughout this dynamic deformation process, because the second deformation zone 302 remains tightly against the inner wall of the profile, and its curvature change is continuous and gradual, the profile will not experience instantaneous stress jumps or support loss within the curvature transition zone, effectively ensuring the stability of the forming process and the accuracy of the final shape.

[0030] like Figure 2 and Figure 3 As shown, the shaping unit 20 is further subdivided into a first shaping unit 21 and a second shaping unit 22 according to the different functions of the corresponding deformation zones. The first shaping unit 21 corresponds to the inner side of the first deformation zone 301 in terms of spatial installation position, while the second shaping unit 22 corresponds to the inner side of the second deformation zone 302. At least one first shaping unit 21 is arranged on the inner side of each first deformation zone 301. The first shaping unit 21 basically maintains its drive rod extension length unchanged throughout the bending process. Its main function is to act as a rigid support point to maintain the constant curvature shape of the first deformation zone 301 and prevent it from undergoing unexpected curvature changes due to the traction pull when the adjacent second deformation zone 302 is deformed or the friction force transmitted by the profile.

[0031] Furthermore, at least one second adjustment unit 22 is configured on the inner side of each second deformation zone 302. Its core function is completely different from that of the first adjustment unit 21. It is configured to have active extension and retraction capabilities to precisely adjust the local curvature of the second deformation zone 302 at a specific moment. During the adjustment process, through the interaction between its end contact module and the flexible contact plate 30, it ensures that the bending deformation of the second deformation zone 302 is uniform and controlled when transitioning from the first curvature to the second curvature, and will not form local depressions or wavy wrinkles on the profile surface due to insufficient support points or sudden changes in support force.

[0032] In some embodiments, the first shaping unit 21 serves as a conformal actuator, mainly comprising a first hydraulic cylinder 211, a first contact module 212, and a first drive rod 213. The first hydraulic cylinder 211, as an independent hydraulic power element, has its cylinder body fixedly mounted on the upper surface of the mold mounting platform 10 via a component. The first drive rod 213 is the telescopic piston rod end of the first hydraulic cylinder 211, which can extend or retract along its axial direction under the pressure of hydraulic oil. The first contact module 212 is a metal block with a certain thickness and rigidity, fixedly connected to the end of the first drive rod 213, and its outer surface maintains close surface contact with the inner wall surface of the first deformation zone 301.

[0033] In the initial stage of bending, the first drive rod 213 is adjusted to a specific length, causing the first contact module 212 to support the first deformation zone 301 to a first curvature. Throughout the bending process, when the profile bends more deeply and the flexible contact plate 30 tends to have a slight lateral displacement, the first drive rod 213 can be slightly extended and adjusted through pressure compensation of the hydraulic system, pushing the first contact module 212 to always closely follow the positional changes of the first deformation zone 301, thereby continuously maintaining reliable support for the first deformation zone 301 and accurately maintaining the predetermined curvature.

[0034] Furthermore, the second shaping unit 22, as an active shaping actuator, mainly includes a second hydraulic cylinder 221, a second contact module 222, and a second drive rod 223. The second hydraulic cylinder 221 is also fixedly mounted on the top of the mold mounting platform 10 via its cylinder body. The second drive rod 223 is connected to the drive end of the second hydraulic cylinder 221 and can achieve high-precision position servo extension and retraction under the control of a servo valve. The second contact module 222 is fixedly mounted on the end of the second drive rod 223, with its top surface attached to the inner wall surface of the second deformation zone 302.

[0035] Unlike the static shape-maintaining function of the first shaping unit 21, the second contact module 222 requires active, large-stroke extension movement in the second stage of bending. When the control system determines that the second deformation zone 302 needs to be adjusted from the first curvature to the second curvature, the second drive rod 223 will extend or retract at a specific speed and acceleration according to the preset interpolation motion curve, causing the second contact module 222 to lift the second deformation zone 302. During this process, the second contact module 222 not only needs to change its length according to the change in the curvature of the profile, but also needs to adapt to the horizontal position movement caused by the change in geometric relationship of the profile during bending, so as to always ensure precise conformal support for the second deformation zone 302.

[0036] To achieve precise curvature control over the relatively long second deformation zone 302, multiple second contact modules 222 are arranged along its length on the inner side of the same second deformation zone 302. These second contact modules 222 are arranged in a straight line along the length of the flexible contact plate 30, and each second contact module 222 is driven by an independently controlled second drive rod 223. During the bending process, in order to achieve a uniform transition from the first curvature to the second curvature, these second drive rods 223 are controlled to extend by different lengths according to their respective positions in the length direction, so that the top envelope surfaces of all the second contact modules 222 exactly form the arc surface of the target second curvature.

[0037] Thus, through this independent driving and collaborative fitting working mode, multiple second contact modules 222 jointly apply support force to the second deformation zone 302. This not only maintains the current curvature of the zone when the external load changes, but more importantly, through the differential displacement coordination between the drive rods, it can precisely control the transient shape of the second deformation zone 302 during the curvature change process, ensuring that it always smoothly transitions from the first curvature to the second curvature, and eliminating the multi-segment broken line effect caused by excessive spacing between support points.

[0038] like Figure 4 As shown, to further optimize the contact mechanical characteristics between the second contact module 222 and the flexible contact plate 30, the top surface of the second contact module 222 that contacts the second deformation zone 302 is designed as a contact surface 2220 with a specific shape. This contact surface 2220 is not a plane, but a convex arc surface. Its radius of curvature is optimized according to the possible curvature range of the second deformation zone 302, aiming to increase the contact area between the contact module and the flexible plate, thereby effectively reducing the contact pressure per unit area and avoiding excessive local wear or indentations on the flexible contact plate 30 due to stress concentration. Simultaneously, the dimension of the contact surface 2220 in the direction perpendicular to the mold mounting table 10 (i.e., the profile cross-section height direction) is set to be equal to the height of the second deformation zone 302.

[0039] The contact module's support force is designed to fully cover the entire height range of the profile cross-section, ensuring uniform stress distribution across the profile's width and effectively preventing lateral torsion or localized web collapse due to unilateral stress. Typically, to ensure sufficient support stiffness and curvature control accuracy for long, high-curvature bending sections, at least two second contact modules 222 are provided inside each second deformation zone 302. The arc and height of the contact surfaces 2220 of these two modules are identical to ensure symmetrical and consistent support.

[0040] In some embodiments, the first contact module 212 is constructed as an arc-shaped plate with a constant curvature. The radius of curvature of its surface facing the flexible contact plate 30 is precisely machined to perfectly match the radius of curvature required to be maintained by the first deformation zone 301. This allows for maximum contact area with the inner wall of the first deformation zone 301, providing uniform and stable support reaction force. Since the curvature of the first deformation zone 301 remains constant throughout the bending process, only one first contact module 212 is needed on the inner side of each first deformation zone 301 to meet the support requirements. This single arc-shaped plate structure is simple, rigid, and requires no complex linkage control, ensuring support reliability while reducing mold manufacturing and control costs.

[0041] like Figure 5As shown, to prevent the profile from warping or detaching from the mold support surface in the height direction perpendicular to the bending plane due to the combined effect of strong axial tensile force and radial bending force during the bending process, the present invention fixes limiting clamps 23 at the upper and lower ends of the first contact module 212 and the second contact module 222, i.e., at both ends along the height direction of the profile, respectively, using bolts 231. The limiting clamps 23 are L-shaped or flat blocks, which, after installation, protrude horizontally towards the outer side of the flexible contact plate 30, thereby forming a limiting groove between the protruding part and the surface of the flexible contact plate 30 to accommodate the upper and lower edges of the profile.

[0042] In some embodiments, the width of the limiting groove is slightly greater than the height of the profile, which can effectively limit the excessive movement or dislodging of the profile in the height direction, and will not hinder the necessary sliding and rotation of the profile along the bending plane during the bending process due to excessive tight constraint.

[0043] Furthermore, the top surface of the mold mounting platform 10 is pre-machined with multiple positioning holes 101 arranged in a matrix according to a standard grid spacing. The bottoms of the first hydraulic cylinder 211 and the second hydraulic cylinder 221 are both fixed on a positioning base 24. This positioning base 24 can be flexibly and precisely installed at any predetermined coordinate position on the mold mounting platform 10 by fastening bolts inserted into the positioning holes 101 at different positions. This structure allows the installation position of the shaping unit 20 to be quickly and steplessly adjusted according to the segment length and curvature change point of different profiles, greatly improving the mold's adaptability to different specifications of cable car cabin profiles and production changeover efficiency.

[0044] like Figure 2 , Figure 3 and Figure 6 As shown, in order to balance the bending compliance, sufficient structural rigidity, and excellent low-friction characteristics of the flexible contact plate 30 under complex support conditions, the flexible contact plate 30 is designed as a multi-layered composite strip structure, which includes, from the inside out, a contact deformation strip 31, an elastic connecting strip 32, a self-lubricating strip 33, and a floating metal strip 34. Among them, the contact deformation strip 31, as the innermost layer, is in direct contact with the top surface of each contact module of the shaping unit 20. Its material has a certain degree of hardness and wear resistance, and is used to withstand the concentrated support force transmitted from the contact module, and to convert these point-like or block-like support forces into distributed forces that are transmitted to the upper layer.

[0045] Furthermore, the profile is attached to the outer surface of the outermost floating metal strip 34, which is a polished thin steel strip with a smooth surface for direct contact with the inner wall of the profile. The floating metal strip 34 is configured to slide freely horizontally relative to the inner self-lubricating strip 33 along its length. Specifically, when the profile moves tangentially along its length under tensile bending force, the static friction between the profile and the floating metal strip 34 causes the floating metal strip 34 to slide along with the profile, thereby completely transforming the intense sliding friction that originally existed between the profile and the mold into a sliding friction between the inner wall of the floating metal strip 34 and the outer wall of the self-lubricating strip 33, effectively protecting the profile surface from scratches.

[0046] Furthermore, to improve the bending compliance of the contact deformation band 31 under segmented support from the shaping unit 20, enabling it to easily conform to the target curved surface fitted by multiple discrete support points, multiple serrated grooves 310 are uniformly formed along the length of the surface of the contact deformation band 31 facing the elastic connecting band 32 (i.e., its upper surface). These serrated grooves 310 are similar to weakening grooves processed on a sheet material; they reduce the bending stiffness of the contact deformation band 31 in that local area, making it easier for the contact deformation band 31 to naturally bend between the support points when subjected to the pushing force of the contact module. This avoids the suspension or bridging phenomenon of the rigid plate under discrete support, ensuring the accuracy of the shape of the flexible contact plate 30. The elastic connecting band 32 is fixed between the contact deformation band 31 and the self-lubricating band 33 by vulcanization bonding or high-strength structural adhesive. Its material is polyurethane or rubber with high elasticity and high fatigue resistance, used to absorb the shear strain difference between the layers during bending deformation and to provide a certain shape recovery force after the external force is unloaded.

[0047] Furthermore, the self-lubricating belt 33 is embedded with multiple graphite pillars 331 evenly distributed in a matrix. The ends of these graphite pillars 331 are in contact with the inner wall of the floating metal belt 34. When the floating metal belt 34 slides, the graphite particles in the graphite pillars 331 are transferred to the sliding interface to form a stable solid lubricating film, thereby reducing the sliding friction coefficient to an extremely low level and ensuring that the floating metal belt 34 slides smoothly without creeping.

[0048] In some embodiments, the graphite column 331 is a sintered graphite column containing metal powder, such as copper powder, and is pressed into the hole with an interference fit. The sintered graphite column has better self-lubricating properties, and the interference fit ensures that it will not fall off into the mold gap during repeated vibration.

[0049] In addition, the overall length of the flexible contact plate 30 is designed to be greater than the total length of the profile to be processed, ensuring that the head and tail of the profile are always supported by the complete mold working surface during the bending process, avoiding unexpected collapse or warping deformation of the profile ends due to suspension, and ensuring the forming consistency of the profile throughout its entire length.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A bending die for cable car cabin profiles, characterized in that, include: The mold mounting table (10) is installed on the bending machine; A flexible contact plate (30) is disposed above the mold mounting table (10) and provides support on the inside of the bent portion when the profile is bent. The shaping unit (20) is installed on the mold mounting table (10) and can provide support force to the flexible contact plate (30); The profile bends along its length with at least two curvatures, including a first curvature and a second curvature, with the second curvature being greater than the first curvature. The flexible contact plate (30) includes a first deformation zone (301) and a second deformation zone (302) respectively provided in the regions corresponding to the first and second curvatures of the profile bending along its length. The number of the first deformation zone (301) and the second deformation zone (302) is at least one. The flexible contact plate (30) is constructed to be supported by the shaping unit (20) to adjust the curvature shape. In the initial stage of profile bending, the curvature of the first deformation zone (301) and the second deformation zone (302) are both adjusted to the first curvature. When the overall curvature of the profile reaches the first curvature, the second deformation zone (302) is adjusted by the shaping unit (20) to gradually change from the first curvature to the second curvature, so that the corresponding area of ​​the profile follows the second deformation zone (302) to change from the first curvature to the second curvature. During the deformation process, it is always supported by the second deformation zone (302).

2. The bending die for cable car cabin profiles according to claim 1, characterized in that: The shaping unit (20) includes a first shaping unit (21) and a second shaping unit (22). The first shaping unit (21) is disposed on the inner side of the first deformation area (301), and the second shaping unit (22) is disposed on the inner side of the second deformation area (302). At least one first shaping unit (21) is disposed on the inner side of the first deformation area (301), and at least one second shaping unit (22) is disposed on the inner side of the second deformation area (302). The first shaping unit (21) is configured to maintain the curvature shape of the first deformation area (301), and the second shaping unit (22) is configured to adjust the curvature of the second deformation area (302) and maintain the second deformation area (302) to deform uniformly from the first curvature to the second curvature during the adjustment process.

3. The bending die for cable car cabin profiles according to claim 2, characterized in that: The first shaping unit (21) includes a first hydraulic cylinder (211), a first contact module (212), and a first drive rod (213). The first hydraulic cylinder (211) is fixedly installed on the top of the mold mounting table (10). The first drive rod (213) is located at the drive end of the first hydraulic cylinder (211). The first contact module (212) is installed on the first drive rod (213) and is attached to the inner wall of the first deformation area (301). The first contact module (212) is driven by the first drive rod (213) to follow the bending adjustment position of the profile.

4. The bending die for cable car cabin profiles according to claim 3, characterized in that: The second shaping unit (22) includes a second hydraulic cylinder (221), a second contact module (222), and a second drive rod (223). The second hydraulic cylinder (221) is fixedly installed on the top of the mold mounting table (10). The second drive rod (223) is located at the drive end of the second hydraulic cylinder (221). The second contact module (222) is installed on the second drive rod (223) and is attached to the inner wall of the second deformation zone (302). The second contact module (222) is driven by the second drive rod (223) to adjust its position according to the curvature and position change of the profile.

5. The bending die for cable car cabin profiles according to claim 4, characterized in that: Multiple second contact modules (222) are provided on the inner side of the same second deformation zone (302), and each second contact module (222) is controlled by an independent second drive rod (223). Multiple second contact modules (222) jointly support the second deformation zone (302) to maintain or adjust the curvature and position of the second deformation zone (302).

6. The bending die for cable car cabin profiles according to claim 4, characterized in that: The contact surface between the second contact module (222) and the second deformation area (302) is set as a contact surface (2220), the contact surface (2220) is set as an arc surface, and the height of the contact surface (2220) is equal to the height of the second deformation area (302). At least two second contact modules (222) are provided inside each second deformation area (302).

7. The bending die for cable car cabin profiles according to claim 3, characterized in that: The first contact module (212) is configured as an arc plate, and the curvature of the first contact module (212) is the same as the curvature of the first deformation area (301). At least one first contact module (212) is provided on the inner side of each first deformation area (301).

8. The bending die for cable car cabin profiles according to claim 4, characterized in that: The upper and lower ends of the first contact module (212) and the second contact module (222) are fitted with a limiting clamp (23) by bolts (231). The limiting clamp (23) protrudes from the flexible contact plate (30) in the horizontal direction to form a groove for accommodating the profile. The limiting clamp (23) is used to restrict the profile from moving in the height direction. The top of the mold mounting table (10) is provided with positioning holes (101) distributed in a matrix. The bottoms of the first hydraulic cylinder (211) and the second hydraulic cylinder (221) are mounted on the mold mounting table (10) by a positioning base (24).

9. The bending die for cable car cabin profiles according to claim 1, characterized in that: The flexible contact plate (30) includes a contact deformation band (31), an elastic connecting band (32), a self-lubricating band (33), and a floating metal band (34). The contact deformation band (31) is attached to one side of the shaping unit (20), and the profile is attached to the outside of the floating metal band (34). The floating metal band (34) is configured to slide relative to the self-lubricating band (33) in a horizontal direction under force.

10. The bending die for cable car cabin profiles according to claim 9, characterized in that: The contact deformation band (31) has a serrated groove (310) on the side facing the elastic connecting band (32). Multiple serrated grooves (310) are evenly arranged along the length direction. The elastic connecting band (32) is fixed between the contact deformation band (31) and the self-lubricating band (33). Multiple graphite columns (331) are installed on the self-lubricating band (33) in a matrix distribution. The length of the flexible contact plate (30) is greater than the length of the profile.

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