Digital intelligent flaring forming equipment and method for metal conduit

Abstract

The invention discloses digital intelligent flaring forming equipment and method for metal conduits. The forming equipment comprises a spindle box, a flaring cone die driven by an air cylinder and a driving motor is arranged on the upper portion of the spindle box, an electric sliding rod driven by a sliding rod motor is arranged on the lower portion of the spindle box, and the electric sliding rod drives a sliding table located above a workbench to move along a sliding rail; a clamping tool is installed on the sliding table, and a flaring clamping die is assembled in the clamping tool. According to the method, flaring forming simulation verification and unloading springback simulation verification are carried out by calculating key process parameters through a finite element method so as to ensure that the process parameters meet design requirements; and then shaping of flaring forming equipment is carried out based on the technological parameters, and flaring forming and inspection are carried out after a metal guide pipe is installed. By means of the method, the flaring forming precision and quality of the guide pipe can be effectively improved, the time for optimizing the technological parameters in the test is saved, the optimized technological parameters are obtained, and the manufacturing cycle and machining precision of parts are improved.

Description

Technical Field

[0001] This invention relates to the field of catheter flaring and forming, and specifically to a digital flaring and forming device and method for metal catheters. Background Technology

[0002] Flared connections are the most widely used and mature form of metal conduit connection. Currently, almost all hydraulic pipeline systems in various fields in my country use flared connections. Flared conduit connections mainly achieve conduit sealing by connecting an outer nut, a flat nozzle to the fitting, and a conduit cone. The key to ensuring the conduit's sealing performance lies in the forming quality of the conical tip at the flared end of the conduit.

[0003] Taking aviation ducts as an example, the current forming method for flaring aviation ducts in China is mainly manual operation of spinning machines. Key process parameters such as the end face protrusion and feed rate of the flared duct are all based on human experience and there are no standardized process parameters. In the current theoretical research and analysis of duct flaring process parameters, the impact of unloading springback on the flaring size is rarely considered, resulting in a large difference between theoretical process parameters and actual production.

[0004] With the increasing development of related fields, the requirements for catheter manufacturing quality are becoming more stringent. Existing flaring forming methods result in large flaring size errors after forming, leading to low flaring forming process efficiency and poor assembly quality and interchangeability of flared catheters. The demand for high-quality and high-efficiency flared catheters is becoming increasingly urgent. Summary of the Invention

[0005] The purpose of this invention is to provide a digital flaring forming device and method for metal conduits, so as to improve the quality and efficiency of conduit flaring forming.

[0006] To achieve the above objectives, the present invention employs the following technical solution: A digital flaring and forming equipment for metal conduits includes: a spindle box and a control panel, wherein the control panel is externally connected to a computer capable of calculating process parameters and performing finite element simulation; The upper part of the spindle box contains a cylinder, and a drive motor is installed at the output end of the cylinder. A flared conical die is installed at the output end of the drive motor through a bushing. The lower part of the spindle box contains a slide rod motor, and an electric slide rod is installed at the output end of the slide rod motor. The electric slide rod is embedded in the slide rail, and a slide table is installed on the slide rail. The slide table is driven by the electric slide rod. A clamping fixture is installed on the slide table; a flaring die corresponding to the flaring cone die is mounted on the clamping fixture, and the metal conduit to be flared is installed in the flaring die through a flat nozzle; a sensor is installed on the rear surface of the clamping fixture opposite to the flaring cone die, and a push rod with a scale is installed on the front surface of the clamping fixture. The position of the clamping fixture on the slide rail is controlled by adjusting the scale, thereby controlling the amount L of the metal conduit end protruding relative to the end face of the flaring die.

[0007] Furthermore, the sensor, slide motor, and drive motor are all connected to the control panel.

[0008] Furthermore, a threaded groove is provided below the slide table to cooperate with the electric slide rod. The slide rod motor drives the electric slide rod to move back and forth, thereby driving the slide table to move on the slide rail.

[0009] A digital flaring forming method for metal conduits includes: Step 1: Determine the flaring process parameters based on the material and specifications of the metal conduit; Step 2: In the flaring forming module of the external computer, a finite element simulation model is established based on the flaring cone mold, flaring clamping mold, and the digital model of the metal conduit. Finite element simulation is performed. The first convergence condition for the flaring size is set as follows: the flaring size meets the preset matching requirements between the nominal outer diameter and the outer diameter after flaring, and the minimum wall thickness is not less than the preset ratio of the nominal wall thickness of the metal conduit. If the flaring size converges, proceed to the next step. If not, reset the process parameters and repeat Step 2 until the first convergence condition is met. Step 3: Import the converged simulation results from Step 2 into the unloading and release module to simulate and calculate the springback. Set the second convergence condition as follows: the flaring size meets the preset matching requirements between the nominal outer diameter and the outer diameter after flaring, and the distance from the flaring end face to the flaring clamping mold is not less than the preset length. If the second convergence condition is met, proceed to the next step; otherwise, adjust the process parameters and repeat the steps. Step 4: For the process parameters that meet the second convergence condition in Step 3, determine the shape and size of the flaring cone mold and the flaring clamping mold, and prepare, process, install and debug them; Step 5: Assemble the flaring cone die and flaring clamping die onto the bushing and clamping fixture respectively. Fit the flat tube nozzle against the flaring clamping die. Assemble the metal conduit to be processed into the flaring clamping die. Turn on the sensor on the control panel. Based on the end elongation position of the metal conduit measured by the sensor, adjust the graduated push rod to position the end face of the metal conduit at the end face elongation amount obtained in the previous step. At the corresponding positions, close the two sides of the flared clamping mold; Step 6: Move the flaring cone die to align the center of the metal conduit end face with the center of the cone angle of the flaring cone die. Then, the flaring cone die is simultaneously fed axially and rotated circumferentially. Under the action of pressure and torque, the metal conduit forms a cone mouth until the outer surface of the metal conduit is completely fitted with the flat nozzle, thus completing the flaring process.

[0010] Furthermore, the process parameters for flaring are determined based on the material and specifications of the metal conduit, including: The process parameters include a fixed clamping die angle γ, a conical die angle θ, a feed speed v, and an end face protrusion L; the clamping die angle γ is the included angle of the forming surface at the end of the flat nozzle; the conical die angle θ is the cone angle of the flaring conical die; and the feed speed v is the rotational speed of the flaring conical die. The formula for calculating the cone angle θ is:

[0011] Where D is the nominal outer diameter of the metal conduit. The outer diameter of the flared metal conduit. The material flow coefficient of the metal conduit; The clamping angle γ is usually slightly smaller than the conical die angle θ, and the calculation formula is:

[0012] End face protrusion The calculation formula is:

[0013] Where t is the wall thickness of the metal conduit, and d is the end compensation amount; feed rate The calculation formula is:

[0014] Where n is the number of revolutions of the drive motor 15, and f is the feed per revolution.

[0015] Furthermore, the flaring forming module includes: a three-dimensional geometric model of the metal conduit; a three-dimensional geometric model of the flaring forming equipment; material parameters of the metal conduit, including Young's modulus, Poisson's ratio, coefficient of linear expansion, and mass density; boundary conditions, including contact friction and ambient temperature; a flaring simulation mesh model; and a true stress-true strain curve of the metal conduit material calculated based on the displacement-load curve obtained from the simulated compression test.

[0016] Furthermore, the unloading and release module includes: the simulation results inherited from step 2, including the geometric model of the flared section of the metal conduit, the relative position of the metal conduit and the flaring forming device, the stress, strain, and temperature field distribution of the flared section, and the flaring unloading limit strain rate.

[0017] Furthermore, the flared clamping mold is made of aluminum alloy.

[0018] Furthermore, when aluminum alloy is used for the metal conduit, the flow coefficient is 0.3~0.9; when stainless steel is used, the flow coefficient is 0.15~0.5; and the end compensation amount d is 0.3~1.3mm.

[0019] Furthermore, when the metal conduit is made of aluminum alloy, the rotation speed n is 500-800 r / min, and the feed rate f per revolution is 0.2-0.3 mm / r; when it is made of stainless steel, n is 400-700 r / min, and f is 0.17-0.24 mm / r; when it is made of titanium alloy, n is 300-600 r / min, and f is 0.17-0.4 mm / r.

[0020] Compared with the prior art, the present invention has the following technical features: This invention utilizes theoretical calculations and finite element simulations of key process parameters to verify whether the dimensions of the guide tube are qualified during the forming and unloading springback process. It standardizes process parameters, saves time in experimental optimization of process parameters, and obtains optimized parameters such as clamping angle, cone angle, feed speed, rotation speed, and end face protrusion. After meeting the forming conditions, the guide tube dimensions are processed, significantly improving the dimensional accuracy and increasing the manufacturing cycle and processing accuracy of the parts. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the method of the present invention; Figure 2 This is a front view of the catheter flaring device; Figure 3 This is a schematic diagram of the inside of the spindle box of the conduit flaring equipment; Figure 4 This is a schematic diagram of the catheter flaring slide. Figure 5 This is a schematic diagram of the catheter flaring process; Figure 6 This is a schematic diagram of the key process parameters for catheter flaring and forming.

[0022] Explanation of reference numerals in the attached drawings: 1. Spindle box; 2. Control panel; 3. Bushing; 4. Flared conical die; 5. Sensor; 6. Dial push rod; 7. Slide table; 8. Slide rail; 9. Worktable; 10. Electric slide rod; 11. Equipment base; 12. Bracket; 13. Slide rod motor; 14. Cylinder; 15. Drive motor; 16. Clamping fixture; 17. Flared die clamp; 18. Connecting conduit; 19. Hydraulic pump; 20. Metal conduit; 21. Flat nozzle; γ. Die clamping angle; θ. Conical die angle; v. Feed speed; ω. Rotational speed; d. End face extension. Detailed Implementation

[0023] This invention provides a digital flaring forming device and method for metal conduits. By providing flaring forming equipment and combining the determination of key process parameters such as clamping mold angle γ, conical mold angle θ, feed speed v, rotation speed ω, and end face protrusion d with precise finite element verification, the forming quality and efficiency are improved.

[0024] See Figures 2 to 6The present invention provides a digital flaring and forming equipment for metal conduits, comprising a spindle box 1, wherein a control panel 2 is mounted on the surface of the spindle box 1, and the control panel 2 is externally connected to a computer capable of calculating process parameters and performing finite element simulation. Both the spindle box 1 and the worktable 9 are mounted on the equipment base 11, with the worktable 11 located in front of the spindle box 1. The equipment base 11 is fixed to the ground via a bracket 12. The upper part of the spindle box 1 contains a cylinder 14, and a drive motor 15 is mounted on the output end of the cylinder 14. A bushing 3 is fitted onto the output end of the drive motor 15 using a hole-shaft fit, and a flared conical die 4 is installed in the bushing 3 using a hole-shaft fit. The lower part of the spindle box 1 contains a slide rod motor 13, and an electric slide rod 10 is mounted on the output end of the slide rod motor 13. The electric slide rod 10 is embedded in a slide rail 8 located above the worktable 11, and a slide table 7 is mounted on the slide rail 8. A threaded groove that mates with the electric slide rod 10 is provided below the slide table 7. The slide rod motor 13 drives the electric slide rod 10 to move back and forth, thereby causing the slide table 7 to move on the slide rail 8. A clamping fixture 16 is installed on the slide table 7. The clamping fixture 16 is connected to a hydraulic pump 19 via a connecting conduit 18. The hydraulic pump 19 provides hydraulic driving force to the clamping fixture 16. A flaring mold 17 corresponding to the flaring conical mold 4 is mounted on the clamping fixture 16. The metal conduit 20 to be flared is installed in the flaring mold 17 via a flat nozzle 21. A sensor 5 is installed on the rear surface of the clamping fixture 16 opposite to the flaring conical mold 4. A push rod 6 with a scale is installed on the front surface of the clamping fixture 16. The position of the clamping fixture 16 on the slide rail 8 is controlled by adjusting the scale, thereby controlling the extension amount L of the end of the metal conduit 20 relative to the end face of the flaring mold 17.

[0025] The sensor 5, the slide motor 13, and the drive motor 15 are all connected to the control panel 2.

[0026] Based on the above technical solutions, the present invention further provides a method for intelligent flaring and forming of metal conduits, comprising: Step 1: Determine the flaring process parameters based on the material and specifications of the metal conduit 20.

[0027] To ensure a proper fit between the outer wall of the flared metal conduit 20 and the flat nozzle 21, and to form a flared end face, key process parameters for flaring, such as the clamping die angle γ, the conical die angle θ, the feed speed v, and the end face protrusion L, need to be determined before flaring, depending on the material and specifications of the metal conduit 20. The clamping die angle γ is the included angle of the forming surface at the end of the flat nozzle 21; the conical die angle θ is the cone angle of the flaring conical die 4; and the feed speed v is the rotational speed of the flaring conical die 4. These process parameters are calculated based on the material and specifications of the metal conduit 20, as follows: The formula for calculating the cone angle θ is:

[0028] Where D is the nominal outer diameter of the metal conduit 20. The outer diameter of the 20mm flared metal conduit. The flow coefficient of the metal conduit 20 is given by the following formula: for the metal conduit 20, the flow coefficient of aluminum alloy is 0.3~0.9, and the flow coefficient of stainless steel is 0.15~0.5.

[0029] The clamping angle γ is usually slightly smaller than the conical die angle θ, and the calculation formula is:

[0030] End face protrusion The calculation formula is:

[0031] Where t is the wall thickness of the metal conduit 20, and d is the end compensation amount; generally, the end compensation amount d is 0.3~1.3mm.

[0032] feed rate The calculation formula is:

[0033] Wherein, n is the number of revolutions of the drive motor 15, and f is the feed per revolution; the values ​​of parameters n and f are related to different materials of the metal conduit 20, preferably: for aluminum alloy, n is 500-800 r / min, and f is 0.2-0.3 mm / r; for stainless steel, n is 400-700 r / min, and f is 0.17-0.24 mm / r; for titanium alloy, n is 300-600 r / min, and f is 0.17-0.4 mm / r.

[0034] Step 2, simulation verification of flaring forming.

[0035] The shapes of the flaring cone mold 4 and the flaring clamping mold 17 are designed based on the calculated process parameters. A finite element simulation model is established in the flaring forming module of the external computer based on the digital model of the flaring cone mold 4, the flaring clamping mold 17 and the metal conduit 20, and finite element simulation is performed. The convergence condition of the flaring size is set as follows: the flaring size meets the preset matching requirements of the nominal outer diameter and the outer diameter after flaring, as shown in Table 1; the thinnest wall thickness is not less than 70% of the nominal wall thickness of the metal conduit 20. If the flaring size converges, proceed to the next step; if not, reset the process parameters and repeat step 2 until the convergence condition is met.

[0036] Table 1

[0037] The flaring forming module should include: a three-dimensional geometric model of the metal conduit 20; a three-dimensional geometric model of the flaring forming equipment; material parameters of the metal conduit 20, including Young's modulus, Poisson's ratio, coefficient of linear expansion, and mass density; boundary conditions including contact friction and ambient temperature; a flaring simulation mesh model; and the material displacement-load curve of the metal conduit 20 obtained from the simulated compression test, and the true stress-true strain curve of the metal conduit 20 calculated based on the displacement-load curve.

[0038] The true strain calculation formula is: The formula for calculating true stress is: Where F is the test load, A0 is the cross-sectional area of ​​the metal conduit 2, l is the instantaneous height, and l0 is the initial height.

[0039] Step 3: Unload and rebound simulation verification. Import the simulation results from step 2 into the unloading and release module to simulate and calculate the springback. Set the convergence conditions as follows: the flaring size meets the requirements of Table 1, and the distance from the flaring end face to the flaring clamping mold 17 is not less than 0.4mm. If the convergence conditions are met, proceed to the next step; otherwise, adjust the process parameters and repeat step 2 until the convergence conditions are met.

[0040] The unloading and release module should include: the simulation results inherited from step 2, including the geometric model of the flared section of the metal conduit 20, the relative position of the metal conduit 20 and the flaring forming device, the stress, strain, and temperature field distribution of the flared section, and the flaring unloading limit strain rate.

[0041] Step 4: Design and manufacture of flaring forming equipment.

[0042] Based on the process parameters verified in steps 2 and 3, the shape and size of the flaring cone mold 4 and the flaring clamping mold 17 are determined and prepared, processed, installed and debugged; to avoid clamping scratches during clamping and flaring forming, aluminum alloy is selected as the material for the flaring clamping mold 17.

[0043] Step 5, clamping the metal conduit 20.

[0044] Assemble the flaring cone die 4 and the flaring clamping die 17 onto the bushing 3 and the clamping fixture 16 respectively. Fit the flat nozzle 21 into the flaring clamping die 17. Assemble the metal conduit 20 to be processed into the flaring clamping die 1. Turn on the sensor 5 on the control panel 2. According to the end elongation position of the metal conduit 20 measured by the sensor 5, adjust the push rod 6 with the scale to position the end face of the metal conduit 20 at the end face elongation obtained in the above steps. At the corresponding positions, close the two sides of the flared clamping mold 17 to complete the clamping.

[0045] Step 6: Flaring and shaping.

[0046] Move the flaring cone mold 4 to align the center of the end face of the metal conduit 20 with the center of the cone angle of the flaring cone mold 4. Then, the flaring cone mold 4 is simultaneously fed axially and rotated circumferentially. Under the action of pressure and torque, the metal conduit 20 forms a cone mouth until the outer surface of the metal conduit 20 is completely fitted with the flat nozzle 21, and the flaring is finally completed.

[0047] Step 7: After the flaring is completed, inspect the flared section.

[0048] This catheter flaring and forming method enables flaring and forming of catheters of various specifications. It effectively improves the accuracy and quality of catheter flaring and forming, saves time in experimental optimization of process parameters, obtains optimized process parameters, and improves the manufacturing cycle and machining accuracy of parts.

[0049] Example: The following example uses a 5B02 aluminum alloy JG20X1mm conduit as an implementation case for detailed description. However, the present invention is not limited to this, and other materials and specifications can also be flared and formed using the method of the present invention. Step 1: Determine the process parameters for flaring.

[0050] Input the following process parameters into control panel 2: Material: 5B02 aluminum alloy; Specifications: Diameter 20mm, Wall thickness 1mm; Outer diameter after flaring: 26.5mm: 20mm: : Metal conduit 20; Material: 5B02 aluminum alloy; Specifications: Diameter 20mm, Wall thickness 1mm; Outer diameter after flaring: 26.5mm: ... Cone angle: ; Clamping angle: ; End face protrusion: ; Rotational speed n: 800 r / min, feed per revolution f: 0.3 mm / r; Feed rate: .

[0051] Step 2, simulation verification of flaring forming.

[0052] Based on the above process parameters, design the shapes of the flaring cone mold 4 and the flaring clamping mold 17. Draw the three-dimensional digital models of the metal conduit 20, the flaring cone mold 4, and the flaring clamping mold 17, and establish a flaring finite element simulation model; import the following parameters into the flaring forming module: the room temperature true stress-true strain relationship curve of 5B02 aluminum alloy, the Young's modulus, Poisson's ratio, coefficient of linear expansion, and mass density of 5B02 aluminum alloy are shown in Table 2; the contact friction coefficient is 0.2, and the ambient temperature is 25℃; the flaring forming mesh adopts a Ringmesh mesh with larger axial and tangential directions and finer radial direction. The flaring cone die 4 and flaring clamping die 17 are equivalent to a cone head that only moves and a clamping block that holds the tube body. The three-dimensional geometric model of the metal conduit 20 and the flaring forming equipment is imported into the flaring forming module. The convergence conditions are set as follows: the flaring size is 26.5~27mm and the thinnest wall thickness is not less than 0.7mm. Based on the simulation results, the shape of the flaring forming equipment and the process parameters such as the clamping die angle γ, the cone die angle θ, the feed speed v, the rotation speed ω, and the end face protrusion L are verified. It is verified that the process parameters calculated in this embodiment can achieve convergence. Table 2

[0053] Step 3: Unload and rebound simulation verification. Import the following parameters into the unloading springback module: The simulation results of step 2 include the geometric model of the flared section, the relative position of the metal conduit 20 and the flaring forming equipment, the stress, strain and temperature field distribution of the flared section; and the flaring unloading limit strain rate of 0.0001.

[0054] Based on actual working conditions, during unloading, the flaring cone die 4 is unloaded first, followed by the flaring clamping die 17. The convergence condition is set as follows: the flaring size is 26.5~27mm, and the distance from the end face of the flaring cone to the flaring clamping die 17 is not less than 0.4mm. Based on the simulation results, it is determined that the shape of the flaring forming equipment and the process parameters such as the clamping die angle, cone die angle, feed speed, rotation speed, and end face protrusion in step 2 meet the convergence condition. Step 4: Design and manufacture of flaring forming equipment.

[0055] Based on the clamping angle γ: 66°, the conical die angle θ: 74°, the conical die feed speed v: 4mm / s, the rotation speed ω: 800r / min, and the end face protrusion L: 3.64mm, the shape and size of the flared conical die 4 and the flared clamping die 17 were designed and the preparation, processing, installation and debugging were completed. The material of the flared clamping die 17 was selected as aluminum alloy.

[0056] Step 5, Preparations before flaring.

[0057] Assemble the flaring die 4 onto the bushing 3, turn on the hydraulic pump 19, open the clamping fixture 16, assemble the flaring clamp 17 onto the clamping fixture 16, so that the flat nozzle 21 fits against the flaring clamp 17, assemble the metal conduit 20 to be processed into the flaring clamp 1, turn on the sensor 5 on the control panel 2, and adjust the push rod 6 with the scale according to the end extension position of the metal conduit 20 measured by the sensor 5, so that the end face of the metal conduit 20 is positioned at the end face extension amount obtained in the above steps. At the corresponding positions, close the two sides of the flared clamping mold 17 to complete the clamping.

[0058] Inspect the machine tools and flaring equipment to ensure they are undamaged, and check the machining quality and roughness of the 20-inch end of the metal conduit.

[0059] Step 6: Flaring and shaping.

[0060] Start the equipment, move the flaring cone die 4, and align the center of the end face of the metal conduit 20 to be processed with the center of the cone angle of the flaring cone die 4. Then, the flaring cone die 4 is simultaneously fed axially and rotated circumferentially under the cooperation of the cylinder 14 and the drive motor 15. The feed speed v is 4 mm / s and the rotation speed ω is 800 r / min. Under the action of pressure and torque, the metal conduit 20 forms a cone mouth until the outer surface of the conduit is completely in contact with the flat nozzle 21. Then, after maintaining the current circumferential rotation speed of the flaring cone die 4 for 5 seconds, unload the flaring cone die 4 axially, open the clamping die, and take out the flared metal conduit 20. Use sandpaper and a file to file and round the sharp edges; use CEE-BEE A-918 cleaner to remove oil from the pipe end.

[0061] Step 7: Inspect the flared section.

[0062] Check the flared section for any clamping or machining scratches on the outer surface; scratches should not exceed 0.03mm. Check the inner surface of the flared section for any processing scratches, marks, cracks, etc. Check the outer edge of the flared section for cracks and burrs; Check whether the outer edge wall thickness of the catheter flare section is less than 70% of the nominal wall thickness of the catheter; Check whether there is wall thickness buildup at the root of the conical flare of the duct.

[0063] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A metal conduit intelligent expanding forming device, characterized in that, include: The spindle box (1) and control panel (2) are connected to a computer that can calculate process parameters and perform finite element simulation. The upper part of the spindle box (1) has a cylinder (14), and the output end of the cylinder (14) is equipped with a drive motor (15). The output end of the drive motor (15) is equipped with a flared conical die (4) through a bushing (3). The lower part of the spindle box (1) has a slide rod motor (13), and the output end of the slide rod motor (13) is equipped with an electric slide rod (10). The electric slide rod (10) is embedded in the slide rail (8), and a slide table (7) is installed on the slide rail (8). The slide table (7) is driven by the electric slide rod (10). A clamping fixture (16) is installed on the slide table (7); a flaring clamping mold (17) corresponding to the flaring cone mold (4) is assembled on the clamping fixture (16); the metal conduit (20) to be flared is installed in the flaring clamping mold (17) through the flat nozzle (21); a sensor (5) is installed on the rear surface of the clamping fixture (16) opposite to the flaring cone mold (4); a push rod (6) with a scale is installed on the front surface of the clamping fixture (16); the position of the clamping fixture (16) on the slide rail (8) is controlled by adjusting the scale, thereby controlling the extension amount L of the end of the metal conduit (20) relative to the end face of the flaring clamping mold (17).

2. The metal conduit intelligent expanding forming device according to claim 1, characterized in that, The sensor (5), slide motor (13), and drive motor (15) are all connected to the control panel (2).

3. The metal conduit intelligent expanding forming device according to claim 1, characterized in that, The slide table (7) is provided with a threaded groove that mates with the electric slide rod (10). The slide rod motor (13) drives the electric slide rod (10) to move back and forth, thereby driving the slide table (7) to move on the slide rail (8).

4. A method of intelligent flaring of a metal conduit, comprising: include: Step 1: Determine the flaring process parameters based on the material and specifications of the metal conduit (20); Step 2: In the flaring forming module of the external computer, a finite element simulation model is established based on the digital model of the flaring cone mold (4), the flaring clamping mold (17), and the metal conduit (20), and finite element simulation is performed. The first convergence condition of the flaring size is set as follows: the flaring size meets the preset matching requirements of the nominal outer diameter and the outer diameter after flaring, and the minimum wall thickness is not less than the preset ratio of the nominal wall thickness of the metal conduit (20). If the flaring size converges, proceed to the next step; if not, reset the process parameters and repeat Step 2 until the first convergence condition is met. Step 3: Import the simulation results after convergence in Step 2 into the unloading and release module to simulate and calculate the springback. Set the second convergence condition as follows: the flaring size meets the preset matching requirements of the nominal outer diameter and the outer diameter after flaring, and the distance from the flaring end face to the flaring clamping mold (17) is not less than the preset length. If the second convergence condition is met, proceed to the next step. If not, adjust the process parameters and repeat Step 2. Step 4: For the process parameters that meet the second convergence condition, determine the shape and size of the flared conical mold (4) and the flared clamping mold (17), and prepare, process, install and debug them; Step 5, the flared cone die (4) and flared die (17) are assembled to the shaft sleeve (3) and clamping tool (16) respectively, the flat tube nozzle (21) is attached to the flared die (17), the metal pipe (20) to be processed is assembled in the flared die (1), the sensor (5) is turned on on the control panel (2), the metal pipe (20) end extension position is measured according to the sensor (5), the scale dial push rod (6) is adjusted, and the metal pipe (20) end face is placed at the end face extension amount obtained in the above step The flared die (17) is folded on both sides at the corresponding position. Step 6, the flared cone die (4) is moved, the end face center of the metal pipe (20) is aligned with the cone angle center of the flared cone die (4), then the flared cone die (4) is simultaneously fed axially and rotated circumferentially, the metal pipe (20) is formed into a flared cone under the action of the pressure and torsion force until the outer surface of the metal pipe (20) is completely attached to the flat pipe nozzle (21), and finally the flaring forming is completed.

5. The method of intelligent flaring of a metal conduit of claim 4, wherein, The process parameters of the flaring forming are determined according to the material and specifications of the metal pipe (20), including: The process parameters include the die clamping angle γ, the cone die angle θ, the feeding speed v, and the end face extension L; the die clamping angle γ is the included angle of the end forming surface of the flat pipe nozzle (21); the cone die angle θ is the cone angle of the flared cone die (4); the feeding speed v is the rotating speed of the flared cone die (4); The calculation formula of the cone die angle θ is: where D is the nominal outside diameter of the metal conduit (20), is the outside diameter of the metal conduit (20) after flaring, is the metal flow coefficient of the metal conduit (20); The die clamping angle γ is usually slightly smaller than the cone die angle θ, and the calculation formula is: end face overhang The calculation formula is: Wherein, t is the wall thickness of the metal pipe 20, and d is the end head compensation amount; feed speed The calculation formula is: Wherein, n is the number of revolutions of the driving motor (15), and f is the feeding amount per revolution.

6. The method of intelligent flaring of a metal conduit of claim 4, wherein, The flaring forming module comprises: a three-dimensional geometric model of the metal pipe (20); a three-dimensional geometric model of the flaring forming equipment; material parameters of the metal pipe (20), including Young's modulus, Poisson's ratio, linear expansion coefficient, and mass density; boundary conditions, including contact friction and environmental temperature; a flaring simulation grid model; a material displacement-load curve of the metal pipe (20) obtained based on a simulated compression test, and a material true stress-true strain curve of the metal pipe (20) calculated according to the displacement-load curve.

7. The method of intelligent flaring of a metal conduit of claim 4, wherein, The unloading release module comprises: simulation results inherited from step 2, including the geometric model of the flared section of the metal pipe (20), the relative position of the metal pipe (20) and the flaring forming equipment, and the stress, strain, and temperature field distribution of the flared section; and a flaring unloading limit strain rate.

8. The method of intelligent flaring of a metal conduit of claim 4, wherein, The material of the flaring die (17) is selected from an aluminum alloy.

9. The method of intelligent flaring of a metal conduit of claim 4, wherein, When the metal pipe (20) is made of an aluminum alloy, the flow coefficient is 0.3-0.9; when the metal pipe (20) is made of stainless steel, the flow coefficient is 0.15-0.5; and the end head compensation amount d is 0.3-1.3 mm.

10. The method of intelligent flaring of a metal conduit of claim 4, wherein, When the metal pipe (20) is made of an aluminum alloy, the number of revolutions n is 500-800 r / min, and the feeding amount f per revolution is 0.2-0.3 mm / r; when the metal pipe (20) is made of stainless steel, n is 400-700 r / min, and f is 0.17-0.24 mm / r; and when the metal pipe (20) is made of a titanium alloy, n is 300-600 r / min, and f is 0.17-0.4 mm / r.

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