A multi-field coupling type elbow forming device and a method of using the same

Abstract

The application discloses a kind of multi-field coupling type elbow forming device and its using method, belong to elbow forming technical field.Pursuant to the first aspect of the application, the multi-field coupling type elbow forming device, comprising: rack, propulsion unit, wheel mould unit, anti-wrinkle clamping unit, rotating press mould unit, current application point at the both ends of pipe fitting, the insulation component for isolating the current between pipe fitting and mould, state sensing unit for sensing elbow forming process state parameter and support part fixedly arranged above work panel and used for supporting pipe fitting;Based on electric auxiliary type elbow processing technology, by adopting sensing unit, the multi-field data in pipe fitting processing process is detected, and the best applied current is judged based on data information, and the elbow forming quality can be effectively improved;In addition, the application comprehensively insulates and protects the various contact positions of pipe fitting and elbow processing device, effectively prevents the applied current and equipment loop, solves the technical problems such as production safety hazard.

Description

Technical Field

[0001] This invention belongs to the field of pipe bending forming technology, and more specifically, relates to a multi-field coupled pipe bending forming device and its usage method. Background Technology

[0002] Various defects have consistently occurred during the bending and forming of tubing, such as cross-sectional deformation, wrinkling, thinning, and springback. These defects not only affect product quality and production assembly schedules but also pose safety hazards to aircraft system functionality. The reliability and durability of piping systems are crucial for meeting airworthiness requirements, ensuring flight safety, and reducing maintenance costs. Therefore, improving tubing bending and forming technology is essential for enhancing aircraft performance. The high deformation resistance of titanium alloys makes them difficult to form during machining, and their low elastic modulus also presents challenges in controlling springback accuracy after machining, especially for cylindrical or variable-curvature titanium alloy workpieces.

[0003] The cold bending process of high-strength titanium alloy tubes requires large-tonnage equipment, has low angle control precision, and is prone to defects such as springback and wrinkling. "Edge undercut" defects easily occur during mold closing, making it difficult to control the roundness of the product cross-section. Therefore, given the current demand for lean manufacturing in aerospace products, research into high-efficiency, high-precision, high-yield, and low-cost forming technologies for titanium alloy tubes is urgently needed. To achieve precise CNC bending of titanium alloy tubes, establishing a comprehensive bending and forming process system for titanium alloy tubes will have immeasurable significance for the widespread use of titanium alloys.

[0004] To improve the quality of pipe bending, Chinese invention patent CN112122419A discloses a small bending radius pipe bending mold and a bending method for pipe bending. The small bending radius pipe bending mold includes a mold, which is clamped by a pipe bending machine, and an insulating pad is provided between the mold and the clamp. A cavity is provided inside the mold, and a pipe is placed inside the cavity. Electrodes are installed at both ends of the pipe, and the electrodes are electrically connected to a pulse circuit to form a loop. This invention introduces pulse current into the original CNC bending forming process and reasonably divides the forming process into several sub-bending processes, wherein each sub-bending process includes a force loading step and a pulse current loading step. This invention avoids the problems of low heating efficiency, long processing time, uneven temperature distribution, and tube surface oxidation associated with resistance heating bending. During processing, due to the electroplastic effect, the titanium alloy exhibits low deformation resistance, high plasticity, and does not display strong anisotropy during deformation, thus improving the bending forming limit and forming quality of difficult-to-deform titanium alloy tubes. Furthermore, Chinese invention patent CN110014060B discloses a micro-heatpipe current-assisted bending forming device and method, belonging to the field of plastic micro-forming technology for tube bending manufacturing. It includes a bending forming machine, a mold assembly, and an auxiliary... A forming power system is provided; the mold assembly is mounted on a bending forming machine, which mainly consists of a fixed base plate, a pressing tube assembly, a bending tube assembly, a rotating shaft, a rotating drive mechanism, and a control system; the bending tube assembly is equipped with a rotating shaft, which mates with a shaft hole on the fixed base plate; the pressing tube assembly is fixed to the fixed base plate; the forming method steps are: Step 1, select the mold assembly; Step 2, construct the power circuit; Step 3, set the parameters; Step 4, heat the micro heat pipe blank and bend it; Step 5, bend the blank to obtain a bent part; Step 6, remove the bent part. This invention can control defects and forming accuracy in the bending forming of micro heat pipes, and solves the problem of decreased heat transfer capacity after bending of micro heat pipes.

[0005] In the above technical solutions, an auxiliary current is applied to improve the quality of the bent pipe by utilizing electroplasticity. However, the following technical issues still need to be addressed: (1) The magnitude of the applied current has a significant impact on the quality of the bent pipe. Due to the coupling of multiple fields such as stress field, current field, and temperature field, the optimal magnitude of the applied current during the bending process fluctuates. The existing technology does not consider the optimal adjustment of the applied current. (2) The bending processing equipment based on the current field needs to be equipped with a set of safe and complete insulation components to prevent the current applied in the bent pipe from being conducted to the equipment body, causing damage to the bending equipment and leading to safety accidents. (3) Integrating real-time monitoring and collecting the status information of the bending process helps to realize subsequent modeling, optimization, and automated control. However, the existing technology does not clearly provide corresponding technical means. (4) The material deformation of the double-wall gap pipe is relatively complex during the bending process. Without filler, wrinkling and uneven gaps are very likely to occur. Ensuring coordinated deformation of the inner and outer layers of the pipe is very challenging. Summary of the Invention

[0006] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a multi-field coupled pipe bending forming device and its usage method. Based on electrically assisted pipe bending technology, it employs a sensing unit to detect multi-field data during pipe processing and determines the optimal applied current based on the data information, effectively improving the quality of pipe bending. Furthermore, this invention provides comprehensive insulation protection for all contact points between the pipe and the pipe bending processing device, effectively preventing the applied current in the pipe from forming a circuit with the equipment, thus avoiding technical problems such as equipment damage and safety hazards.

[0007] According to a first aspect of the present invention, a multi-field coupled pipe bending forming apparatus includes:

[0008] The machine frame with a fixed working panel on its surface, a propulsion unit, a wheel mold unit, an anti-wrinkle clamping unit, a rotating pressing mold unit, current loading points fixed at both ends of the pipe fitting, an insulating component that isolates the current applied to the pipe fitting, a status sensing unit that senses the status parameters of the pipe bending forming process, and a support part fixedly set above the working panel for supporting the pipe fitting.

[0009] The propulsion unit includes a first propulsion component for rapid feeding and a second propulsion component for slow feeding. The first propulsion component includes a rack guide rail fixedly mounted above the working panel, a sliding support plate slidably connected to the rack guide rail, a first propulsion drive motor fixedly connected to the sliding support plate, a transmission gear fixedly connected to the output shaft of the first propulsion drive motor and meshing with the rack guide rail, and a clamping push rod mounted above the sliding support plate for clamping the pipe fitting.

[0010] The wheel mold unit includes a central rotating shaft fixedly connected to the working panel, a main wheel mold, and a secondary wheel mold rotatably mounted on the central rotating shaft;

[0011] The rotating mold unit includes a mold drive motor located directly below the central rotating shaft and fixedly connected to the bottom of the working panel, a base fixedly connected to the output shaft of the mold drive motor via a connecting rod, and a mold fixedly connected to the front end of the base via a second bayonet.

[0012] The anti-wrinkle clamping unit includes a clamping drive assembly that provides linear motion driving force, a positioning plate that is fixedly connected to the output end of the clamping drive assembly, and an anti-wrinkle mold that is fixed to the positioning plate by a first buckle.

[0013] The insulating assembly includes a first isolation clamping block fixedly disposed between the anti-wrinkle mold and the positioning plate, a second isolation clamping block fixedly disposed between the base body and the pressing mold, an isolation sleeve assembly sleeved between the central hole of the main wheel mold and the auxiliary wheel mold and the outer wall of the central rotating shaft, an isolation support block fixedly disposed above the support part and maintaining direct contact with the pipe, and an isolation clamping head disposed at the end of the clamping push rod.

[0014] Preferably, the state sensing unit includes:

[0015] An angle sensor fixedly installed below the main wheel mold for sensing the deformation field inside the pipe; a pressure sensor installed between the second isolation clamp block and the seat body for sensing the force field of the pipe; and a temperature sensor fixedly installed on the positioning plate near the pipe for sensing the temperature field of the pipe.

[0016] Preferably, the second propulsion component includes:

[0017] A first mounting and positioning block fixedly connected to the sliding support plate, a second push drive motor fixedly connected to the first mounting and positioning block, and a linear transmission assembly connecting the clamping push rod and the output end of the second push drive motor for pushing the clamping push rod forward;

[0018] Preferably, the clamping drive assembly includes:

[0019] The system includes a second mounting and positioning block fixedly connected to the work panel, a clamping drive motor fixedly connected to the second mounting and positioning block, a lead screw fixedly connected to the output shaft of the clamping drive motor, and a nut push plate slidably connected to the guide rail on the work panel and screw-driven to the lead screw. The front end of the nut push plate is fixedly connected to the positioning plate.

[0020] Preferably, the isolation sleeve assembly includes:

[0021] The first isolation sleeve, the second isolation sleeve, and the third isolation sleeve are sequentially installed on the central rotating shaft from bottom to top. The second isolation sleeve intersects with the contact plane between the auxiliary wheel mold and the main wheel mold.

[0022] Preferably, the state sensing unit includes:

[0023] A limit sensor is installed on the side of the positioning plate near the pipe to prevent the pushing unit from colliding with the anti-wrinkle clamping unit.

[0024] Preferably, the insulating components of the insulating assembly (5) are made of four materials. The insulating material between the pressing mold, the anti-wrinkle mold, and the equipment bears the pressure and is a gasket made of mica material. The connection between the pressing mold and the anti-wrinkle mold uses a dovetail key made of high-strength PEEK material. The insulating component between the bending mold and the equipment is subjected to both pressure and shear stress during the bending process of the pipe, therefore a high-strength glass fiber anti-pressure gasket is used. The first, second, and third isolation sleeves of the central rotating shaft are in direct contact with the wheel mold and the rotating shaft, and are subjected to the main pressure and friction forces; therefore, ceramic materials with high hardness, high strength, and strong compressive strength are used.

[0025] Preferably, the gap between the double-walled pipes is filled with ceramic medium in the gap between the pipe walls and the inner pipe, and a specific filling pressure is achieved by combining a clamping device to realize the solid bending and forming of the pipe, which provides a new means to control and eliminate bending and forming defects in double-walled gap pipes.

[0026] According to a second aspect of the present invention, a method of using a multi-field coupled pipe bending forming apparatus includes the following steps:

[0027] S100: Install electrode connecting rings on both ends of the pipe to be processed, and fill the pipe with hard particles.

[0028] S200: One end of it is fixedly connected to the front end of the clamping push rod and directly contacts the tube only through the isolation clamp, while the other end is clamped between the main wheel mold and the anti-wrinkle mold;

[0029] S300: An initial current is applied to the pipe fitting through the electrode connecting ring. At the same time, the first propulsion drive motor of the propulsion unit is started to rotate. The sliding support plate is driven to move forward along the rack guide rail through the gear, which in turn drives the isolation chuck on the clamping push rod to move forward. Combined with the second propulsion assembly, it performs slow feeding to improve the stability of the feed amount.

[0030] S400: When the pipe fitting comes into contact with the die, the die drive motor of the rotating die unit is started, which in turn drives the base to rotate along the center line of the main die. Thus, under the combined action of the die and the main die, a bending force is applied to the pipe fitting. At the same time, the anti-wrinkle die can effectively eliminate the wrinkles that occur in the pipe fitting during the bending process.

[0031] S500: The state sensing unit will monitor the temperature field, deformation field, and force field during the pipe fitting processing in real time, thereby predicting the optimal current to be applied to the pipe fitting based on multi-field coupling data information and making adjustments in real time.

[0032] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0033] 1. The present invention provides a multi-field coupled pipe bending forming device based on electrically assisted pipe bending processing technology. By employing a sensing unit to detect multi-field data during pipe processing and determining the optimal applied current based on the data information, the device can effectively improve the quality of pipe bending forming. In addition, the present invention provides comprehensive insulation protection for all contact points between the pipe and the pipe bending processing device, effectively preventing the applied current in the pipe from forming a circuit with the equipment, thus preventing damage to the equipment and potential safety hazards.

[0034] 2. The multi-field coupling pipe bending forming device of the present invention has a fast and slow feeding mode for the pipe. With the cooperation of the two, the feed amount can be precisely controlled. In use, the fast feeding of the pipe is controlled by starting the first propulsion drive motor in combination with the gear and rack transmission. At the same time, the slow feeding of the pipe can be controlled by starting the second propulsion drive motor, which effectively realizes the flexible control of the feed amount.

[0035] 3. The multi-field coupling tube bending forming device of the present invention has a multi-layer isolation structure designed between the central rotating shaft and the auxiliary wheel mold and the main wheel mold, and completely isolates the contact surface between the auxiliary wheel mold and the main wheel mold. This solution not only avoids the safety risk of leakage current when the auxiliary wheel mold and the main wheel mold move and deviate, but also only requires maintenance of the corresponding isolation sleeve when wear and damage occur. The isolation sleeve solution based on the multi-layer design structure effectively reduces maintenance costs.

[0036] 4. This invention provides a multi-field coupled pipe bending forming device. In the gap between double-walled pipes, ceramic particles are used to fill the gap between the pipe walls and the inner tube. A specific filling pressure is achieved using a clamping device, enabling solid bending forming of the pipe. This provides a new method for controlling and eliminating bending forming defects in double-walled gap pipes. Furthermore, the fluidity and reusability of the ceramic particles facilitate cleaning of the double-walled pipes. Simultaneously, rapid heating with pulsed current ensures uniform temperature control, providing crucial precision and quality assurance for coordinated deformation and uniform control of the double-walled gap pipes. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a multi-field coupled pipe bending forming device provided in an embodiment of the present invention.

[0038] Figure 2 This is a top view schematic diagram of the overall structure of a multi-field coupled pipe bending forming device provided in an embodiment of the present invention.

[0039] Figure 3 This is an enlarged schematic diagram of the mold clamping part of a multi-field coupled pipe bending forming device according to an embodiment of the present invention;

[0040] Figure 4This is a schematic diagram of the wheel mold structure of a multi-field coupled pipe bending forming device according to an embodiment of the present invention;

[0041] Figure 5 A partial enlarged view A is provided for a multi-field coupled pipe bending forming device according to an embodiment of the present invention.

[0042] Figure 6 This is a flowchart illustrating the usage method of a multi-field coupled pipe bending forming device according to an embodiment of the present invention.

[0043] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0044] 1-Frame, 100-Working panel, 2-Propulsion unit, 200-First propulsion assembly, 201-Rack and pinion guide rail, 202-Sliding support plate, 203-First propulsion drive motor, 210-Clamping push rod, 220-Second propulsion assembly, 221-First mounting positioning block, 222-Second propulsion drive motor, 3-Anti-wrinkle clamping unit, 301-Clamping drive motor, 302-Second mounting positioning block, 303-Screw rod, 304-Nut push plate, 305-First buckle, 306-Anti-wrinkle mold, 307-Positioning plate, 4-Support part, 5-Insulation assembly, 501-First isolation clamping block, 502- Second isolation clamp block, 503-isolation sleeve assembly, 5031-first isolation sleeve, 5032-second isolation sleeve, 5033-third isolation sleeve, 504-isolation support block, 505-isolation clamp, 6-state sensing unit, 601-limit sensor, 602-angle sensor, 603-pressure sensor, 604-temperature sensor, 7-electrode connecting ring, 701-positive electrode connecting ring, 702-negative electrode connecting ring, 8-rotation pressing mold unit, 800-base, 801-pressing mold, 802-second bayonet, 9-pipe, 10-wheel mold unit, 1001-sub-wheel mold, 1002-main wheel mold. Detailed Implementation

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to 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 limiting the present invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0049] like Figures 1-5 As shown in the embodiment of the present invention, the multi-field coupled pipe bending forming device includes:

[0050] The machine frame 1 with a working panel 100 fixed on its surface, a propulsion unit 2, a wheel mold unit 10, an anti-wrinkle clamping unit 3, a rotating pressing mold unit 8, an electrode connecting ring 7 fixed to both ends of the pipe fitting 9, an insulating component 5 that isolates the current applied to the pipe fitting 9, a status sensing unit 6 that senses the status parameters of the pipe bending forming process, and a support part 4 fixedly set above the working panel 100 and used to support the pipe fitting 9;

[0051] The propulsion unit 2 includes a first propulsion component 200 for rapid feeding and a second propulsion component 220 for slow feeding. The first propulsion component 200 includes a rack guide rail 201 fixedly disposed above the working panel 100, a sliding support plate 202 slidably connected to the rack guide rail 201, a first propulsion drive motor 203 fixedly connected to the sliding support plate 202, a transmission gear fixedly connected to the output shaft of the first propulsion drive motor 203 and meshing with the rack guide rail 201, and a clamping push rod 210 disposed above the sliding support plate 202 for clamping the pipe 9.

[0052] The wheel mold unit 10 includes a central rotating shaft fixedly connected to the working panel 100, a main wheel mold 1002 rotatably mounted on the central rotating shaft, and a secondary wheel mold 1001.

[0053] The rotating mold unit 8 includes a mold drive motor located directly below the central rotating shaft and fixedly connected to the lower part of the working panel 100, a base 800 fixedly connected to the output shaft of the mold drive motor via a connecting rod, and a mold 801 fixedly connected to the front end of the base 800 via a second bayonet 802.

[0054] The anti-wrinkle clamping unit 3 includes a clamping drive assembly that provides linear motion driving force, a positioning plate 307 that is fixedly connected to the output end of the clamping drive assembly, and an anti-wrinkle mold 306 that is fixed to the positioning plate 307 by a first buckle 305.

[0055] The insulating assembly includes a first isolation clamping block 501 fixedly disposed between the anti-wrinkle mold 306 and the positioning plate 307, a second isolation clamping block 502 fixedly disposed between the base 800 and the pressing mold 801, an isolation sleeve assembly 503 sleeved between the center hole of the main wheel mold 1002 and the auxiliary wheel mold 1001 and the outer wall of the central rotating shaft, an isolation support block 504 fixedly disposed above the support part 4 and in direct contact with the pipe 9, and an isolation clamping head 505 disposed at the end of the clamping push rod 210;

[0056] like Figure 5 As shown, in this embodiment of the invention, the state sensing unit 6 includes:

[0057] An angle sensor 602 is fixedly installed below the main wheel mold 1002 to sense the deformation field inside the pipe 9; a pressure sensor 903 is installed between the contact surface of the second isolation clamp block 502 and the seat 800 to sense the force field of the pipe 9; and a temperature sensor 604 is fixedly installed on the side of the positioning plate 307 near the pipe and used to sense the temperature field of the pipe 9.

[0058] The working principle of this invention is as follows: First, electrode connecting rings 7 are installed on both ends of the pipe to be processed 9, and hard particles are densely filled inside the pipe. Next, one end is fixedly connected to the front end of the clamping push rod 210, and directly contacts the pipe 9 only through the isolation clamp 505. The other end is clamped between the main wheel mold 1002 and the anti-wrinkle mold 306. Then, an initial current is applied to the pipe 9 through the electrode connecting rings 7, and at the same time, the first push drive motor 203 of the push unit 2 is started to rotate. Through the gear, the sliding support plate 202 moves forward along the rack guide rail 201, thereby driving the isolation clamp 505 on the clamping push rod 210 to move forward, and in conjunction with the second push... Component 220 is fed slowly to improve the stability of the feed amount. Then, when the pipe 9 comes into contact with the die 801, the die drive motor of the rotating die unit 8 is started, which drives the seat 800 to rotate along the center line of the main wheel die 1002. Thus, under the combined action of the die 801 and the main wheel die 1002, a bending force is applied to the pipe 9. At the same time, the anti-wrinkle die 306 can effectively eliminate the wrinkles that occur in the pipe 9 during the bending process. Then, the status sensing unit 6 will monitor the temperature field, deformation field and force field of the pipe 9 in real time during the processing. Based on the multi-field coupling data information, it will predict the optimal current applied to the pipe 9 and make adjustments in real time.

[0059] In this embodiment of the invention, based on the electrically assisted pipe bending technology, a sensing unit is used to detect multiple field data during the pipe fitting 9 processing, and the optimal applied current is determined based on the data information, which can effectively improve the pipe bending forming quality. In addition, the invention has carried out comprehensive insulation protection treatment on each contact position between the pipe fitting 9 and the pipe bending processing device, which effectively prevents the applied current in the pipe fitting 9 from forming a circuit with the equipment, causing damage to the equipment and creating safety hazards.

[0060] like Figure 2 As shown, in this embodiment of the invention, the second propulsion component 220 includes:

[0061] A first mounting and positioning block 221 fixedly connected to the sliding support plate 202, a second push drive motor 222 fixedly connected to the first mounting and positioning block 221, and a linear transmission assembly connecting the clamping push rod 210 and the output end of the second push drive motor 222 for pushing the clamping push rod 210 forward.

[0062] In this embodiment of the invention, the feeding method of the pipe fitting 9 is set with fast and slow feeding modes. With the cooperation of the two, the feeding amount can be precisely controlled. In use, the fast feeding of the pipe fitting 9 is controlled by starting the first propulsion drive motor 203 in combination with the gear and rack transmission. At the same time, the second propulsion drive motor 222 can be started to control the second-stage slow feeding of the pipe fitting 9, which effectively realizes the flexible control of the feeding amount.

[0063] like Figure 2 As shown, in this embodiment of the invention, the clamping drive assembly includes:

[0064] The second mounting and positioning block 302 is fixedly connected to the working panel 100, the clamping drive motor 301 is fixedly connected to the second mounting and positioning block 302, the lead screw is fixedly connected to the output shaft of the clamping drive motor 301, and the nut push plate 304 is slidably connected to the guide rail on the working panel 100 and screw-driven. The front end of the nut push plate 304 is fixedly connected to the positioning plate 307.

[0065] The insulating component 5 is made of ceramic or mica material;

[0066] like Figure 4 As shown, in this embodiment of the invention, the isolation sleeve assembly 503 includes:

[0067] The first isolation sleeve 5031, the second isolation sleeve 5032 and the third isolation sleeve 5033 are sequentially installed on the central rotating shaft from bottom to top. The second isolation sleeve 5032 intersects with the contact plane of the auxiliary wheel mold 1001 and the main wheel mold 1002.

[0068] In this embodiment of the invention, a multi-layer isolation structure is designed between the central rotating shaft and the secondary wheel mold 1001 and the main wheel mold 1002, and the contact surface between the secondary wheel mold 1001 and the main wheel mold 1002 is completely isolated. This solution not only avoids the safety risk of leakage current when the secondary wheel mold 1001 and the main wheel mold 1002 move and deviate, but also only requires maintenance of the corresponding isolation sleeve when wear and damage occur. The isolation sleeve solution based on the multi-layer design structure effectively reduces maintenance costs.

[0069] like Figure 5 As shown, in this embodiment of the invention, the state sensing unit 6 includes:

[0070] A limit sensor 601 is installed on the positioning plate 307 near the pipe fitting 9 to prevent the pushing unit 2 from colliding with the anti-wrinkle clamping unit 3.

[0071] like Figure 6 As shown in the embodiment of the present invention, the method of using the multi-field coupled pipe bending forming device includes:

[0072] S100: Install electrode connecting rings 7 at both ends of the pipe fitting 9 to be processed, and fill the pipe with hard particles.

[0073] S200: One end of it is fixedly connected to the front end of the clamping push rod 210 and directly contacts the pipe fitting 9 only through the isolation clamp 505, while the other end is clamped between the main wheel mold 1002 and the anti-wrinkle mold 306.

[0074] S300: An initial current is applied to the pipe fitting 9 through the electrode connecting ring 7. At the same time, the first propulsion drive motor 203 of the propulsion unit 2 is started to rotate. The sliding support plate 202 is driven to move forward along the rack guide rail 201 through the gear, which in turn drives the isolation chuck 505 on the clamping push rod 210 to move forward. Combined with the second propulsion assembly 220, it slowly feeds to improve the stability of the feed amount.

[0075] S400: When the pipe fitting 9 comes into contact with the pressure mold 801, the pressure mold drive motor of the rotating pressure mold unit 8 is started, which in turn drives the seat 800 to rotate along the center line of the main wheel mold 1002. Thus, under the joint action of the pressure mold 801 and the main wheel mold 1002, a bending force is applied to the pipe fitting 9. At the same time, the anti-wrinkle mold 306 can effectively eliminate the wrinkles that occur in the pipe fitting 9 during the bending process.

[0076] S500: The state sensing unit 6 will monitor the temperature field, deformation field and force field during the processing of the pipe fitting 9 in real time, thereby predicting the optimal current applied to the pipe fitting 9 based on multi-field coupling data information and making adjustments in real time.

[0077] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A multi-field coupled pipe bending forming device, characterized in that, include: The frame (1) with a working panel (100) fixed on its surface, the push unit (2) on the upper surface of the working panel (100), the wheel mold unit (10), the anti-wrinkle clamping unit (3), the rotating pressing mold unit (8), the electrode connecting rings (7) fixed to both ends of the pipe fitting (9), the insulating component (5) that isolates the current applied to the pipe fitting (9), the status sensing unit (6) that senses the status parameters of the pipe bending process, and the support part (4) fixed above the working panel (100) for supporting the pipe fitting (9); The propulsion unit (2) includes a first propulsion assembly (200) for rapid feed and a second propulsion assembly (220) for slow feed. The first propulsion assembly (200) includes a rack guide rail (201) fixedly mounted above the working panel (100), a sliding support plate (202) slidably connected to the rack guide rail (201), a first propulsion drive motor (203) fixedly connected to the sliding support plate (202), a transmission gear fixedly connected to the output shaft of the first propulsion drive motor (203) and meshing with the rack guide rail (201), and a clamping push rod (210) mounted above the sliding support plate (202) for clamping the pipe (9). The wheel mold unit (10) includes a central rotating shaft fixedly connected to the working panel (100), a main wheel mold (1002) rotatably mounted on the central rotating shaft, and a secondary wheel mold (1001). The rotating mold unit (8) includes a mold drive motor located directly below the central rotating shaft and fixedly connected to the lower part of the working panel (100), a base (800) fixedly connected to the output shaft of the mold drive motor via a connecting rod, and a mold (801) fixedly connected to the front end of the base (800) via a second bayonet (802). The anti-wrinkle clamping unit (3) includes a clamping drive assembly that provides linear motion driving force, a positioning plate (307) fixedly connected to the output end of the clamping drive assembly, and an anti-wrinkle mold (306) fixed to the positioning plate (307) by a first buckle (305). The insulating components include a first isolation clamping block (501) fixedly disposed between the anti-wrinkle mold (306) and the positioning plate (307), a second isolation clamping block (502) fixedly disposed between the base (800) and the pressing mold (801), an isolation sleeve assembly (503) sleeved between the center hole of the main wheel mold (1002) and the auxiliary wheel mold (1001) and the outer wall of the central rotating shaft, an isolation support block (504) fixedly disposed above the support part (4) and kept in direct contact with the pipe (9), and an isolation clamp (505) disposed at the end of the clamping push rod (210).

2. The multi-field coupled pipe bending forming device according to claim 1, characterized in that, The state sensing unit (6) includes: An angle sensor (602) is fixedly installed below the main wheel mold (1002) to sense the deformation field inside the pipe (9); a pressure sensor (903) is installed between the contact surface of the second isolation clamp (502) and the seat (800) to sense the force field of the pipe (9); and a temperature sensor (604) is fixedly installed on the side of the positioning plate (307) near the pipe to sense the temperature field of the pipe (9).

3. The multi-field coupled pipe bending forming device according to claim 2, characterized in that, The second propulsion assembly (220) includes: A first mounting and positioning block (221) fixedly connected to the sliding support plate (202), a second propulsion drive motor (222) fixedly connected to the first mounting and positioning block (221), and a linear transmission assembly connecting the clamping push rod (210) and the output end of the second propulsion drive motor (222) for pushing the clamping push rod (210) forward.

4. A multi-field coupled pipe bending forming device according to any one of claims 1 to 3, characterized in that, The clamping drive assembly includes: The second mounting and positioning block (302) is fixedly connected to the working panel (100), the clamping drive motor (301) is fixedly connected to the second mounting and positioning block (302), the lead screw is fixedly connected to the output shaft of the clamping drive motor (301), and the nut push plate (304) is slidably connected to the guide rail on the working panel (100) and screw-driven. The front end of the nut push plate (304) is fixedly connected to the positioning plate (307).

5. The multi-field coupled pipe bending forming device according to claim 4, characterized in that, The isolation sleeve assembly (503) includes: The first isolation sleeve (5031), the second isolation sleeve (5032) and the third isolation sleeve (5033) are installed sequentially from bottom to top on the central rotating shaft. The second isolation sleeve (5032) intersects with the contact plane of the auxiliary wheel mold (1001) and the main wheel mold (1002).

6. The multi-field coupled pipe bending forming device according to claim 5, characterized in that, The state sensing unit (6) includes: A limit sensor (601) is installed on the side of the positioning plate (307) near the pipe (9) to prevent the push unit (2) from colliding with the anti-wrinkle clamping unit (3).

7. A multi-field coupled pipe bending forming device according to any one of claims 5 or 6, characterized in that: The insulating components of the insulating assembly (5) are made of four materials. The insulating material between the pressing mold and the anti-wrinkle mold and the equipment is a mica gasket; the connection between the pressing mold and the anti-wrinkle mold is a dovetail key made of PEEK material; the insulating component between the bending mold and the equipment is a glass fiber gasket; the first isolation sleeve, the second isolation sleeve, and the third isolation sleeve of the central rotating shaft are in direct contact with the wheel mold and the rotating shaft and are made of ceramic material.

8. A method of using the multi-field coupled pipe bending forming apparatus according to any one of claims 1 to 7, comprising the following steps: S100: Install electrode connecting rings (7) at both ends of the pipe to be processed (9) and fill the pipe with hard particles; S200: One end of it is fixedly connected to the front end of the clamping push rod (210) and directly contacts the pipe fitting (9) only through the isolation clamp (505), while the other end is clamped between the main wheel mold (1002) and the anti-wrinkle mold (306); S300: Apply initial current to the pipe fitting (9) through the electrode connecting ring (7), and at the same time start the first propulsion drive motor (203) of the propulsion unit (2) to rotate. Drive the sliding support plate (202) to move forward along the rack guide rail (201) through the gear, thereby driving the isolation chuck (505) on the clamping push rod (210) to move forward, and combine with the second propulsion assembly (220) to slowly feed, thereby improving the stability of the feed amount; S400: When the pipe fitting (9) comes into contact with the die (801), the die driving motor of the rotating die unit (8) is started, which in turn drives the seat (800) to rotate along the center line of the main wheel die (1002). Thus, under the combined action of the die (801) and the main wheel die (1002), a bending force is applied to the pipe fitting (9). At the same time, the anti-wrinkle die (306) can effectively eliminate the wrinkles that occur in the pipe fitting (9) during the bending process. S500: The state sensing unit (6) will monitor the temperature field, deformation field and force field of the pipe fitting (9) in real time during the processing, thereby predicting the optimal current applied to the pipe fitting (9) based on the multi-field coupling data information and making adjustments in real time.

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