270 results about "Bend radius" patented technology

The invention belongs to the technical field of data cable straightening, and particularly relates to a cable self-adaptive adjusting mechanism which comprises a pay-off device, a first cable inlet angle adjusting mechanism is installed on the upper side of the right end of the pay-off device, and the first cable inlet angle adjusting mechanism is used for adjusting the angle of a pay-off data cable and detecting the surface flatness of the cable. The right end of the first wire inlet angle adjusting mechanism is provided with a second wire inlet angle adjusting mechanism, the right end of the second wire inlet angle adjusting mechanism is provided with a third wire inlet angle adjusting mechanism, the right end of the third wire inlet angle adjusting mechanism is provided with a position adjusting mechanism, and the right end of the position adjusting mechanism is provided with a wire take-up device. The device can be dynamically attached to the bending radian of the cable, rigid extrusion is avoided, pressure is evenly distributed in the circumferential direction of the cable during contact, local abrasion is reduced, and meanwhile self-adaptive wrapping straightening is achieved through flexible pressing.

The invention discloses a BIM-based cable construction method. The method comprises the steps of obtaining BIM model data including a cable design path, a design bending radius and design stress; in the cable laying process, the optical fiber sensors are tightly attached and fixed to the surface of an outer sheath of the cable to be laid, and the optical fiber sensors are continuously distributed in the length direction of the cable; acquiring actual strain distribution data and actual bending radius distribution data of the cable measured by the optical fiber sensor in real time, and performing spatial position correlation comparison with design stress data and design bending radius data in the BIM model; if the actual strain value of any position point exceeds the strain threshold range corresponding to the design stress or the actual bending radius value is smaller than the design bending radius value, it is judged that construction deviation exists in the position point; and generating an adjustment instruction for subsequent cable laying operation based on the position point information with the construction deviation. The cable laying precision and the construction safety can be effectively improved.

The invention relates to an experimental device and method for testing the comprehensive mechanical property of a slender flexible cable, and belongs to the technical field of ocean engineering testing. The device comprises a main body frame, a tensile loading device, a bending load loading device and a torsional load loading device. The tensile loading device is not directly connected with the main body frame and is directly connected with the end part of the cable during an experiment. Through a modular integrated design, multi-axis coupling cooperative loading of stretching, bending and twisting is realized; a stretching actuator provides axial tension; the four-point bending actuator drives the slide rail and the roller to realize dynamic bending, and the bending radius is adjustable; the torsion actuator converts linear motion into torque through a gear-rack mechanism, and the supporting rollers eliminate axial interference. The device has the functions of pressure self-adaptive control and energy recovery. The device solves the problem that a traditional testing machine cannot simulate complex ocean working conditions, and is suitable for comprehensive mechanical property evaluation of flexible pipe cables such as submarine cables.

The utility model discloses a pipe fitting clamping mechanism of a pipe bending machine. The pipe fitting clamping mechanism comprises a base, a rotating shaft is arranged on the base, a working table is connected to the rotating shaft in a rotating mode, an installation frame is arranged on the base, a telescopic rod is arranged on the installation frame, a core rod is arranged at the output end of the telescopic rod, a wheel die is arranged on the rotating shaft, and the working table is connected with the wheel die in a rotating mode. A wheel die is arranged on the workbench, an anti-wrinkling die is fixedly connected to the wheel die, a splicing block is arranged on the wheel die, a guide die is buckled on the anti-wrinkling die, a clamping die is buckled on the splicing block, a supporting frame is arranged on the workbench, and a clamping assembly is arranged on the supporting frame. The clamping assembly and the core rod are arranged on the supporting frame and the base respectively, the inner diameters of the two ends of the pipe are supported at the same time, the stability of the pipe is improved, the bending radius of the pipe is increased, the deformation amount of the pipe in the bending process is effectively reduced, and the defects of distortion, creases and the like caused by uneven stress of a pipe opening are overcome.

The invention relates to the technical field of bending, and provides an aluminum alloy plate integrated bending forming device for the aviation industry, which comprises a bearing rack, a first bending die, second bending dies, a conveying part, a first stamping bending part and a second stamping bending part, the end of the second bending die is provided with a limiting inclined face and a bending fillet, the limiting inclined face is provided with an adsorption hole, the two sets of conveying pieces are symmetrically arranged on the two sides of the first bending die, and a plurality of sets of Y-direction limiting plates are arranged on the surfaces of the conveying pieces. By combining the step-by-step actions of the first stamping and bending part and the second stamping and bending part, the problem that an aluminum alloy plate is prone to springback or cracking due to traditional single-time bending is solved, the problem that the plate is prone to deviation or low in positioning precision in the traditional step-by-step bending process is solved, and the beneficial effect of being high in bending precision is achieved.

The application relates to the technical field of fiber direction simulation, in particular to a composite material fiber direction simulation modeling method and system. The method comprises the following steps: collecting a fiber laying track, correcting the bending radius and unit tangent direction of a path point, and obtaining a fiber laying corrected track; constructing a first direction distribution map according to the tangent direction of each path point in the fiber laying corrected track; analyzing the coverage range of each path in the first direction distribution map on a component curved surface, identifying a curved surface overlapping and crossing area, and calculating an included angle adjustment amount of a direction vector; dividing the first direction distribution map into finite volume units, so as to obtain a second direction distribution map; and performing fiber direction simulation verification according to the second direction distribution map and in combination with preset material anisotropy properties, so as to obtain a fiber direction simulation result. The application is helpful to improve the spatial accuracy of fiber direction modeling and the consistency of simulation prediction.

The invention discloses a wire outlet hole piece capable of reducing wire loss, and belongs to the field of wire outlet hole pieces. Comprising a hollow pipe, an arc-shaped bent part is integrally formed on the lower surface of the hollow pipe, a plurality of through type round holes are formed in the outer side wall of the arc-shaped bent part, and arc-shaped plates are arranged on the outer side wall of the arc-shaped bent part and located above the round holes; the easy-to-pull carton has the advantages that the defects of a traditional easy-to-pull carton outlet mode are effectively overcome through innovative design, when a wire is pulled out in a traditional straight cylinder mode, the wire is frequently folded to 90 degrees, communication wire signal interference is likely to be caused, and a copper wire is even pulled apart in the serious situation; the arc-shaped bending piece integrally formed on the lower surface of the hollow pipe in the wire outlet hole piece meets the requirement that the bending radius of the network wire is not smaller than 8 times of the diameter of the wire rod, so that the wire rod always keeps a reasonable bending radian in the pulling-out process, and the 90-degree hard bending condition is avoided.

To provide a manufacturing method for a press-formed product that is able to properly perform press forming while reducing a bending radius, and to provide the others.SOLUTION: A manufacturing method for a press-formed product P includes: an intermediate product preparing step (step S10) of preparing an intermediate product P1; a placing step (step S20) of placing the intermediate product P1 on a second lower die 21 in which a second shoulder portion 21c is formed with a curvature radius RC2 smaller than a bending radius RB1 of a first bent portion 80; a sandwiching step (step S30) of lowering an upper die 22 including an upper-die shoulder portion 22c with respect to the second lower die 21, sandwiching a side plate 82 of the intermediate product P1 between a side surface 21b and an upper-die recessed-portion side surface 22b, and restraining a bottom plate 81 in a direction along the bottom plate 81; and a press-forming step (step S40) of lowering the upper die 22 to press-form the intermediate product P1.SELECTED DRAWING: Figure 3

The utility model discloses a putty flexibility detection device, and the putty flexibility detection device is provided with a plurality of groups of support plates and shaft bodies, and the support plates and the shaft bodies are connected through folding assemblies, and the folding assemblies can drive the support plates to move along the radial direction of the shaft bodies, and the opening end of the U-shaped frame is rotatably arranged on the shaft body, and a roller is movably arranged in the U-shaped frame through a first displacement assembly, and the roller can move along the length direction of the U-shaped frame, and the clamping block is slidably arranged on the top of the pedestal and connected with the pedestal through a second displacement assembly. Through the above arrangement, the bending radius of the test plate can be adjusted, and the application scenarios of the device are widened.

A cable-bundle-type underwater high-speed cable-releasing device belongs to the field of underwater equipment technology. The present invention proposes a cable-bundle-type cable winding and storage solution based on a nested thin-walled tube structure, replacing conventional spool reels. This solution avoids the space occupied by conventional reels, allows the cable to be wound with a minimum bending radius, saves space, and effectively increases cable capacity. Furthermore, the thin-walled tube assembly of the present invention can simultaneously apply axial and radial constraints to the cable, solving the problem of looseness and collapse between axial rope loops and radial rope layers. This provides more comprehensive constraints, a simpler structure, and easier operation, while also meeting the requirement of not damaging the structure or cable during high-speed underwater cable release.

This utility model relates to the field of hardware bending technology and discloses a hardware product bending device, including a base on which a bending mechanism is provided. By controlling the first bolt, the arc plate is fully embedded in the positioning groove. After the initialization of the bending plate is completed, the hardware product passes through the limiting frame and the fixing seat. The second bolt is controlled to align the baffle with the edge of the arc plate. The bending arm is further controlled to process the hardware product. Benefiting from the different radii of the arc plates, the appropriate arc plate can be selected according to the bending requirements to process hardware products with the required bending radius. By controlling the hardware product to pass between the support seat and the pressure plate, the third bolt is further rotated to move the pressure plate downward. Benefiting from the horizontal and vertical grooves respectively opened on the lower side of the support seat and the pressure plate, the hardware product is clamped between the support seat and the pressure plate and cannot be detached, thereby avoiding accidents during the bending process.

The present application relates to a kind of adjustable bending sheath tube assemblies, including adjustable bending pipe with adjustable bending pipe section and control structure, control structure includes adjusting pipe;Adjusting pipe includes a plurality of first circular arc segments that are connected head to tail and are distributed along the circumference of adjusting pipe, at least one first circular arc segment is different from the hardness of other first circular arc segment;Or, gap is extended along the axial direction on adjusting pipe, adjusting pipe includes at least one second circular arc segment, gap and second circular arc segment are distributed at different positions on the circumference of adjusting pipe;Adjusting pipe can rotate around the axis of adjustable bending pipe, to control the different positions on the circumference of adjusting pipe and the bending direction of adjustable bending pipe section are aligned, and adjustable bending pipe section and adjusting pipe can be bent synchronously, so that adjustable bending pipe can be bent with different bending radius.The above-mentioned adjustable bending sheath tube assembly is adjusted by adjusting the circumferential position of adjusting pipe, to adjust the bending radius and bending angle of adjustable bending pipe section, improve the applicability of the adjustable bending sheath tube assembly, facilitate to reach target position quickly.

The invention provides a method for improving the production efficiency of a high-efficiency spring steel wire, and relates to the technical field of spring steel wire production.The method comprises the following steps that multi-source physical quantities in the spring steel wire winding process are collected in real time, and the multi-source physical quantities comprise steel wire tension distribution, the bending rod curvature radius, a roller temperature field and an equipment vibration frequency spectrum; based on the obtained multi-source physical quantity, a torque instruction, a rotating speed instruction and a bending radius compensation amount are generated through a dynamic collaborative mapping function; according to the generated instruction, a servo motor set is driven to adjust the wire feeding speed and the angular speed of a roller, and meanwhile a piezoelectric trimmer is controlled to correct the bending radius; and adopting a reinforcement learning strategy to optimize control parameters on line, and dynamically updating a mapping function according to winding quality feedback. According to the method, the problem that the remodeling debugging time is long can be effectively solved, the wire breakage rate can be remarkably reduced, and the size consistency can be effectively improved.

The present invention relates to the field of control cable technology, specifically a corrosion-resistant flexible control cable, including a control cable protective sleeve, a driving component, a convex ring component and a cable core conductor. The convex ring component forms a serrated structure on the inner wall of the protective sleeve, and the deformation cavity enclosed by adjacent convex ring components is filled with water-blocking paste, which improves the flexibility of the cable through the buffering of the valley deformation cavity and supports the convex ring to enhance the pressure and puncture resistance; the driving component drives the convex ring component to slide back and forth along the axial direction, so that the valley and peak positions of the serrated structure alternate, disperses the stress during high-frequency bending, avoids concentrated force rupture in the valley, and extends the life of the protective sleeve. In addition, the water-blocking paste is filled in the valley, which can balance the bending radius and strengthen the sealing protection, and is constrained by the separation of the supporting convex ring to prevent aggregation and loss, thereby ensuring stable protection performance. Through structural innovation, the cable achieves a balance and improvement in flexibility, pressure resistance, corrosion resistance and long-term protection capabilities in high-frequency bending scenarios.

This invention proposes a building electrical construction safety monitoring system and method based on Internet of Things (IoT) technology. Through image acquisition, modeling, data analysis, and calculation, it accurately identifies potential problems during construction, such as insufficient bending radius and space constraints. Compared to traditional manual inspection methods, this system can assess risks in real time and quantitatively, avoiding the oversights and delays of manual inspections. It can promptly identify potential cable bending risks during the construction phase, providing timely risk warnings to the construction team and helping them take appropriate adjustment measures to avoid serious electrical faults and fire hazards later. It enables optimization of pipeline layout and cable configuration in the early stages of construction, reducing electrical accidents caused by improper bending and ensuring the stability and safety of the building electrical system during long-term operation.

The utility model discloses a serial port joint that improves cable bending radius is provided with the limiting passage that communicates with its inside on the joint body, and the tail end of limiting passage penetrates the outer wall of joint body, and the cable is located inside limiting passage, and gradually increases from the first end to the tail end inner diameter along the length direction of limiting passage. The utility model discloses a limiting passage is arranged on the joint body, when the cable is bent relative to the joint body, on one hand, the limiting passage that gradually increases from the first end to the tail end inner diameter can give the cable enough bending space, on the other hand, the limiting passage can position and support the cable, while ensuring that the joint of the cable and joint body has enough bending freedom, avoids that the cable is damaged by excessive bending.

The invention relates to the technical field of cable direct-current resistance testing, and provides a polymorphic direct-current resistance testing device which comprises a main frame, a to-be-tested cable is arranged above the main frame, a spring clamp is arranged on the side face of the to-be-tested cable, and an electric lifting table is fixedly connected to the side face of the spring clamp. The side surface of the electric lifting platform is slidably connected with a vertical guide rail, and one end of the to-be-tested cable is provided with a test frame. Through arrangement of a cooperative structure of the spiral frame, the adjusting column, the quantitative sliding rail and the electric sliding table, the contact point of the spiral frame and the to-be-tested cable rotates along with sliding of the adjusting column, continuous adjustment of the bending radius is achieved, the problem that in the prior art, the bending form is single due to the fact that the radius of a bending wheel is fixed is solved, and the bending accuracy is improved. Various bending radius requirements in actual working conditions can be simulated, and the authenticity and comprehensiveness of bending testing are improved.

This application relates to the field of metal bending component manufacturing technology, and discloses a method for controlling the bending radius in progressive forming of tubular materials by spinning and bending. The method includes the following steps: S1, obtaining an optimal combination of loading parameters affecting the forming quality indicators of the tubular material through orthogonal experiments; S2, establishing a regression function between the bending radius and the spinning and bending deformation parameters based on the optimal combination and the Maximin Latin square test results through stepwise regression analysis; S3, testing the regression function; if the test passes, obtaining the regression model of the bending radius; if the test fails, returning to step S2; S4, controlling the bending radius under the optimal loading parameter conditions using the regression model. This application incorporates a diameter reduction parameter into the control method, significantly improving the accuracy of bending radius control compared to existing geometric control models. It reduces the average error between tubular bending radius prediction and control from 10.28% to 5.2%, offering advantages such as high forming accuracy, wide applicability, and higher reliability.

The present application belongs to the technical field of metal sheet plastic forming and digital control cross, and discloses a kind of aluminum veneer multi-axis linkage numerical control bending method based on springback compensation.The method collects historical bending process data, with sheet thickness, bending radius, die slot width and feed speed as input features to divide process feature subspace, and establishes a bending angle springback amount mapping matrix in each subspace to obtain initial down pressure depth compensation value for performing feedforward control.In the multi-axis linkage bending stage, real-time servo motor torque feedback signal and grating displacement signal are collected, and the real-time plastic deformation resistance of the current bending zone is calculated, and the online compensation correction amount is solved using the dynamic differential equation of deformation resistance and springback angle, and the correction amount is added to the remaining trajectory planning of multi-axis interpolation algorithm.The present application makes the down pressure trajectory self-adaptive correction according to real-time resistance, eliminates the fixed compensation deviation, and improves the compliance of bending angle to target value.

A device to level a metal plate fabricated from a material includes a frame, a leveling station, and a draw device. The leveling station includes a single upper roller and a pair of lower rollers in parallel arrangement and defining a serpentine path. A plunge depth is defined based upon a difference between a top-dead-center point of the lower rollers and a bottom-dead-center point of the single upper roller. A longitudinal spacing and the plunge depth are configured such that the single upper roller and the lower rollers are disposed to impart a bend radius on the metal plate as the metal plate is drawn or moved through the serpentine path such that the metal plate has line contact with the outer peripheral surfaces of the single upper roller and the lower rollers. The bend radius is selected to achieve plastification of the metal sheet.

The utility model discloses a pipe bending device with an adjustable bending radius, which relates to the technical field of pipeline construction, and comprises a base, a mounting plate arranged on the base, an annular fixed steel wheel arranged on the mounting plate, a first bolt arranged at the central position of the mounting plate, and a movable steel wheel arranged on the same horizontal plane with the fixed steel wheel, the second plug pin is arranged in the center of the movable steel wheel, the two ends of the connecting rod penetrate through the first plug pin and the second plug pin correspondingly, and the pipeline fixing clamp is used for fixing one end of a to-be-bent pipeline. An adjusting groove capable of adjusting the position of the second bolt is formed in the connecting rod; a plurality of adjusting holes which are annularly distributed are formed in the mounting plate, supporting rods corresponding to the adjusting holes in position are arranged at the lower end of the fixed steel wheel, and the supporting rods are matched with the adjusting holes. The pipe bending device provided by the utility model is adjustable in pipe bending radius, can meet the requirements of construction with different bending radiuses, is small in occupied area, and can be used in a small construction site.

The present application relates to the field of welding machine tool, and particularly relates to an automatic disc welding machine tool for pet cage production. The automatic disc welding machine tool comprises a spot welding assembly, two groups of auxiliary assemblies are symmetrically arranged on the spot welding assembly; in the present application, the metal mesh columns at the top of the side net are respectively clamped in the two groups of clamping holes, the third electric push rod is started to push the twisting sliding frame to slide in the slide way formed in the elastic plate, the elastic plate is bent by the pulling force of the twisting sliding frame, the side net is synchronously bent according to the bending degree of the elastic plate, the sliding plate is pressed and compressed in the sliding cavity to compress the spring when the elastic plate is bent, the bending radius of the elastic plate is passively and assistively adjusted by the rebound force, and the output frequency of the third electric push rod and the rebound force of the compression spring are matched with each other; the flexible protection of the metal side net is improved, and the compatible adjustment effect of the metal side net and the disc welding is improved.

The anti-cracking test device comprises a bottom plate, a vertical frame, a lifting mechanism, two sets of clamps, a cylinder, an adjusting sleeve and a limiting ring, the vertical frame is vertically arranged on the bottom plate, the two sets of clamps are oppositely arranged on the two sides of the inner wall of the vertical frame, the lifting mechanism is connected with the clamps and controls the two sets of clamps to ascend and descend synchronously, and the cylinder is fixedly installed on the surface of the inner wall of the vertical frame. The adjusting sleeve is sleeved on the cylinder; the two ends of the cooled cable are installed in the corresponding clamps respectively, then the clamps are matched with the lifting mechanism to drive the clamps to move downwards, the cable is made to make contact with the cylinder, the cable is bent under the action of the cylinder, and therefore the cable low-temperature bending anti-cracking test is achieved, and when the bending radius needs to be adjusted, the adjusting sleeve with the corresponding radius is arranged on the cylinder in a sleeving mode. And then the limiting ring is screwed, and the installed adjusting sleeve is fixed, so that the test requirements of different bending radiuses are met, and the device is simple in structure, flexible and convenient to use and suitable for large-scale popularization and application.

This application discloses a multi-functional sheet metal composite cutting and planing machine, comprising: a first frame; a cutting mechanism disposed on the first frame for cutting metal sheets; a first conveying structure for conveying metal sheets; a rotating structure for rotating metal sheets; a grooving mechanism disposed on the first frame for planing bending grooves on the metal sheets, solving the bending radius (R-angle) bending process; a second conveying structure for conveying metal sheets; a second frame; and a bending mechanism disposed on the second frame for bending the sheet metal. Through the above structure, this application allows for the direct processing of the required workpiece from metal sheets on a single machine, saving two-thirds of the machine's floor space, increasing processing speed by approximately 3 to 4 times compared to the original step-by-step processing, significantly improving the yield rate, refining the process, and saving approximately 5-6 workers, thus facilitating management.

The utility model relates to the technical field of metal pipe bending forming, in particular to an active non-uniform loading pipe push-bending forming device. The device comprises a bending die with a heating rod inserting opening and a cooling groove, an inner side punch and an outer side punch which can be controlled to move respectively, and a pipe blank to be bent, wherein an inner cavity of the pipe blank to be bent is provided with filler, and the two sides of a bending section of the pipe blank to be bent are coated with the same type or different types of lubricating liquid. According to the utility model, two or three differential loads of differential temperature, differential thrust and differential lubrication are compounded, and the deformation uniformity of the inner side and the outer side of a bent pipe is improved by actively and selectively applying various non-uniform boundary conditions to the inner side and the outer side of the pipe in the push-bending process, so that defect suppression is realized. In principle, the flow of materials of the pipe in the push-bending process can be changed through a composite loading boundary, the stress-strain state of the bent pipe is influenced, and the positive influence of each difference condition on the wrinkling and wall thickness reduction inhibition of the bent pipe is synthesized, so that the light-weight and high-reliability integral forming of the thin-wall small-bending-radius bent pipe can be realized.

The invention belongs to the technical field of bent pipe machining, and particularly relates to a steel large-diameter pipeline bent pipe on-site forming method which comprises the steps that the bending angle is measured through a rope and a protractor; the outer perimeter of the pipe is measured by a tape; the bending radius is calculated, and the back height and the belly height of the end joints are calculated according to a given formula; after the steel pipe is horizontally and stably supported, popping up two axial center lines by using the ink box, popping up a bus at equal division points of the circumference, sequentially marking flush opening intersection points of end joints and middle joints according to calculated sizes, and connecting to form a closed cutting line; cutting along a line by using oxygen-propane neutral flame, numbering and assembling, controlling an alignment gap, cutting a V-shaped groove on site, remeasuring the angle by using a protractor after spot welding, correcting distortion, and turning, welding and forming. The bent pipe can be manufactured on the steel pipe feeding and discharging without a material paper sample plate, material paper sample plate manufacturing can be omitted, sample plate errors are avoided, bent pipe manufacturing precision is improved, meanwhile, the method can adapt to the field construction environment, the technology is simplified, rework and material waste are reduced, cost is reduced, and construction efficiency is improved.

The utility model belongs to the technical field of polyethylene profile production, and particularly relates to a polyethylene profile bending device which comprises a workbench, a lifting table is slidably connected to one side of the top of the workbench, limiting frames are symmetrically and fixedly connected to one side of the top of the lifting table, and clamping plates are slidably connected to the inner sides of the limiting frames. A fixing frame is fixedly connected to one side of the exterior of the workbench, arc-shaped plates are slidably connected to the exterior of the fixing frame at equal intervals, and rotating frames are rotatably connected to the two sides of the exterior of the fixing frame; the utility model provides a polyethylene profile bending device which solves the problems that in the prior art, when a polyethylene profile is bent, operation is carried out through manual cooperation with a bending device, however, an existing bending device is simple in function, only can achieve a single bending radius and lacks the bending radius adjusting function, and the bending efficiency is high. The problems that bending devices of other models need to be replaced when bending of different radiuses needs to be carried out, using is troublesome, and the machining efficiency cannot be improved easily are solved.

The present invention relates to a reel (1) suitable for anchoring a cable (3) to a frame (2), the reel (1) being adapted to be rotatably mounted on the frame (2) about a rotation axis (X), the reel (1) having a side surface (S) about an axis (Y) parallel to the rotation axis (X), the reel (1) being characterized in that the side surface (S) includes a first portion having at least a first bending radius measured in a plane (P) perpendicular to the rotation axis (X), the first bending radius being substantially greater than at least a second bending radius of a second portion of the side surface measured in the plane (P), the reel (1) being adapted to allow the cable (3) to travel by winding and / or unwinding the cable (3) along the first portion about the side surface (S) and by rotating the reel (1) about the rotation axis (X) between a first stop position and a second stop position.

The invention provides a forming method of a large-diameter small-radius thin-wall bent pipe, and relates to the technical field of bent pipe formation.The forming method of the large-diameter small-radius thin-wall bent pipe comprises the steps that S1, a to-be-bent area of a straight pipe blank is locally flattened, and a flattened pipe blank is obtained; s2, the flattened pipe blank is bent, and a preformed bent pipe is obtained; and S3, internal high-pressure bulging is conducted on the pre-formed bent pipe, and a final bent pipe forming piece is obtained. When the large-diameter ultra-thin-wall pipe is formed into the bent pipe with the small bending radius through the method, the risk that the outer side of the pipe is thinned and even broken can be reduced, the possibility that the inner side of the pipe is wrinkled can be reduced, and the overall wall thickness uniformity of the manufactured bent pipe is improved.

The invention belongs to the field of advanced pipe plastic processing and intelligent material application, discloses a pipe bending forming method based on a multi-dimensional gradient distribution magneto-rheological elastomer, and aims to solve the problems that an existing single-dimensional MRE cannot adapt to the pipe bending multi-area rigidity requirement, and the inner side wrinkles, the outer side wall thickness is reduced and the like due to the fact that a device is not provided with a special regulation and control module. The method comprises the following steps: preparing an axial (transition section-bending section magnetic particle gradual increase) and radial (center-circumference magnetic particle gradual change) multi-dimensional gradient MRE core mold, filling a pipe, and cooperatively optimizing a magnetic field and pressure through a fuzzy-PID (Proportion Integration Differentiation) algorithm by using a device comprising a non-magnetic component and a peripheral electromagnetic coil in combination with axial pressure, magneto-rheological rigidity and centrifugal force formula control parameters; the method can efficiently restrain forming defects, is suitable for high-strength, thin-wall and small-bending-radius pipes, and improves the forming quality and efficiency.