Parallel double-tube electromagnetic flanging method using convex coil groups
By using a concurrent dual-tube electromagnetic flanging method with convex coil groups, the problems of insufficient radial electromagnetic force and low efficiency were solved, enabling simultaneous flanging and forming of two tubes, thus improving processing efficiency and diversified production capabilities.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA THREE GORGES UNIV
- Filing Date
- 2023-05-21
- Publication Date
- 2026-06-30
AI Technical Summary
In the existing technology, the electromagnetic flanging method for metal pipe fittings has the disadvantage of insufficient radial electromagnetic force, which makes it difficult to achieve the ideal flanging angle. In addition, only one pipe fitting can be flanged at a time, resulting in low efficiency.
The concurrent dual-tube electromagnetic flanging method using convex coil groups achieves simultaneous flanging of two tubes by designing a first, second, and third coil with aligned axes to provide radial and axial electromagnetic forces respectively.
It improves the efficiency of metal pipe processing and forming, ensures the quality of pipe flanges, and enables diversified and mass production of pipe processing, thereby reducing costs.
Smart Images
Figure CN116727526B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of metal workpiece forming, and specifically relates to a concurrent double-tube electromagnetic flanging method using a convex coil group. Background Technology
[0002] Electromagnetic flanging of metal pipe fittings is a process that uses a coil to provide electromagnetic force to achieve the flanging of the workpiece. In traditional research on electromagnetic flanging of pipe fittings, the driving force for flanging is mainly radial electromagnetic force. However, as the pipe fitting is further away from the coil, the radial electromagnetic force on the pipe fitting becomes smaller and smaller, making it difficult to achieve the ideal flanging angle. Moreover, the method of applying this electromagnetic force is relatively simple, and only one pipe fitting can be flanged at a time, which has certain limitations.
[0003] The utility model patent CN214053294U, entitled "An Electromagnetic Flanging Device for Large-Size Pipe Fittings Based on a Magnetizer," uses a pulsed magnetic field to induce eddy currents on the pipe fitting, thereby generating Lorentz force to rapidly deform the fitting. Simultaneously, an expanding magnetizer is introduced into the system. Without changing the coil, the position and shape of the magnetic field can be altered by adjusting the structure and position of the magnetizer, enabling flanging of different pipe fitting models. While this patent solves the problem of insufficient radial electromagnetic force on the pipe fitting, the lack of axial electromagnetic force results in poor molding performance.
[0004] The utility model patent CN207577198U, entitled "A Non-Contact Flaring or Flanging Device for Pipe Fittings Without the Need to Be Placed Inside the Fitting," provides a non-contact radial electromagnetic force applied from the end of the pipe fitting for flaring and flanging metal pipe fittings. This enables non-contact flaring and flanging of miniature or irregularly shaped pipe fittings, improving workpiece forming performance. While this patent solves the problem of poor mold application due to the lack of axial electromagnetic force, the device can only flare one pipe fitting at a time, resulting in low efficiency. Summary of the Invention
[0005] The purpose of this invention is to address the above-mentioned problems by providing a concurrent electromagnetic flanging method for two tubes using a convex coil group. By employing a convex coil group and designing the parameters and shape of the convex coil group according to the specifications of the first and second tubes, the simultaneous flanging and forming of the two tubes can be achieved, i.e., concurrent forming, thereby improving the efficiency of metal tube processing and forming while ensuring the flanging angle of the tubes.
[0006] The technical solution of this invention is a concurrent dual-tube electromagnetic flanging method using a convex coil group. The dual tubes include a first tube and a second tube with collinear axes. The convex coil group is disposed between the first tube and the second tube, and the axis of the convex coil group is aligned with the axes of the first tube and the second tube. The convex coil group includes a first coil, a second coil, and a third coil with collinear axes. The first coil is used to provide radial electromagnetic force to the flanging area of the first tube, the second coil is used to provide radial electromagnetic force to the flanging area of the second tube, and the third coil is used to provide axial electromagnetic force to the first tube and the second tube.
[0007] The concurrent dual-pipe electromagnetic flanging method includes the following steps:
[0008] Step 1: Determine the inner diameter and number of turns of the first coil, second coil, and third coil according to the size and forming specifications of the first and second pipe fittings, and then manufacture the first coil, second coil, and third coil.
[0009] Step 2: Align the axes of the first coil, the second coil, and the third coil, and fix the first coil and the second coil to both sides of the third coil respectively to form a convex coil group;
[0010] Step 3: Fix the first pipe fitting with the first mold, and set a convex coil group near the flange area of the first pipe fitting. The axis of the convex coil group is aligned with the axis of the first pipe fitting, and the first coil of the convex coil group overlaps axially with the flange area of the first pipe fitting.
[0011] Step 4: Adjust the convex coil group. Control the distance between the third coil of the convex coil group and the first tube according to the forming specifications of the first tube. After the distance adjustment is completed, fix the convex coil group.
[0012] Step 5: Place a second tube near the second coil of the convex coil group. The axis of the second tube is aligned with the axis of the convex coil group, and the flanged area of the second tube overlaps axially with the second coil of the convex coil group. Fix the second tube using a second mold.
[0013] Step 6: Connect the first coil, second coil, and third coil to the coil power supply via switches respectively;
[0014] Step 7: Control the switch to energize the first, second, and third coils. The first and second tubes are flipped under the electromagnetic force of the convex coil group. After flipping, the coil power supply is disconnected.
[0015] Step 8: Determine whether the flanging of the first pipe meets the forming specifications. If it does, proceed to step 9. If it does not meet the forming specifications, control the switch to energize the first and third coils, and flang the first pipe again. After flanging, disconnect the coil power supply and determine again whether the flanging effect meets the forming requirements. Proceed to step 8.
[0016] Step 9: Determine whether the flanging of the second pipe meets the forming specifications. If it does, the process ends. If it does not meet the forming specifications, control the switch to energize the second and third coils and flanging the second pipe again. After flanging, disconnect the coil power supply and determine again whether the flanging effect meets the forming specifications. Then execute step 9.
[0017] Furthermore, the axial height of the first coil of the convex coil assembly h 1 is slightly larger than the length of the flanged area of the first fitting. l 1, that is l 1< h 1< l 1+2mm.
[0018] Furthermore, the axial height of the second coil of the convex coil group h 2 is slightly larger than the length of the flanged area of the second fitting. l 2, that is l 2< h 2< l 2+2mm.
[0019] Preferably, the spacing between the first tube and the first coil of the convex coil group... d 1. Spacing between the second tube and the second coil of the convex coil group d 2 are equal, that is d 1= d 2.
[0020] Compared with the prior art, the beneficial effects of the present invention include:
[0021] 1) The method of the present invention applies radial and axial electromagnetic forces to the first and second tubes at both ends of the convex coil group by means of the convex coil group, and determines the parameters and shape of the coil group according to the specifications of the first and second tubes, thereby realizing the simultaneous flanging and forming of the two tubes, i.e., concurrent forming; while ensuring the flanging quality of the tubes, the efficiency of metal tube processing and forming is doubled.
[0022] 2) The method of the present invention can adopt convex coil groups with different parameters and shapes according to the forming specifications of the first pipe fitting and the second pipe fitting, thereby realizing the diversification of pipe fitting processing and manufacturing.
[0023] 3) The electromagnetic flanging device used in this invention is easy to produce, can be mass-produced, and has low cost, which is conducive to promoting and implementing the method of this invention. Attached Figure Description
[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0025] Figure 1 This is a schematic diagram of the dual-pipe electromagnetic flanging device in Embodiment 1.
[0026] Figure 2 This is a schematic diagram of the flanged effect of the double-pipe fitting in Example 1.
[0027] Figure 3 This is a schematic diagram of the dual-pipe electromagnetic flanging device in Embodiment 2.
[0028] Figure 4 This is a schematic diagram of the double-pipe flange effect in Example 2.
[0029] Figure 5 This is a schematic diagram of the dual-pipe electromagnetic flanging device in Embodiment 3.
[0030] Figure 6 This is a schematic diagram of the flanged effect of the double-pipe fitting in Example 3.
[0031] Figure 7 This is a schematic diagram of the dual-pipe electromagnetic flanging device in Embodiment 4.
[0032] Figure 8 This is a schematic diagram of the flanged effect of the double-pipe fitting in Example 4.
[0033] Explanation of reference numerals in the attached drawings: First pipe fitting 1, flanged area 101 of the first pipe fitting, second pipe fitting 2, flanged area 201 of the second pipe fitting, convex coil group 3, first coil 301, second coil 302, third coil 303, first mold 4, second mold 5. Detailed Implementation
[0034] Example 1
[0035] The dual-pipe electromagnetic flanging device of this embodiment includes a first pipe 1 and a second pipe 2 with collinear axes, a convex coil group 3, a first mold 4, and a second mold 5. The convex coil group 3 is disposed between the first pipe 1 and the second pipe 2, with its axis aligned with the axes of the first pipe 1 and the second pipe 2. The convex coil group 3 includes a first coil 301, a second coil 302, and a third coil 303 with collinear axes. The first coil 301 provides radial electromagnetic force to the flanging area 101 of the first pipe, the second coil 302 provides radial electromagnetic force to the flanging area 201 of the second pipe, and the third coil 303 provides axial electromagnetic force to both the first and second pipes. The first coil 301, the second coil 302, and the third coil 303 are respectively connected to a capacitor power supply via a switch. When the control switch is turned on, a pulse current is generated within the first coil 301, the second coil 302, and the third coil 303. The first mold 4 and the second mold 5 are used to fix the first pipe 1 and the second pipe 2, respectively.
[0036] Inner diameter of the first pipe fitting 1 r Inner diameter of 1 and the second pipe fitting 2 r 2 are equal, that is r 1= r 2; Length of the flanged area 101 of the first pipe fitting l 1. Length of the flanged area 201 of the second fitting l 2 are equal, that is l 1= l 2; The distance between the first tube 1 and the first coil 301 of the convex coil group d The distance between 1 and the second tube 2 and the second coil 302 of the convex coil group d 2 are equal, both set to 2mm, that is d 1= d 2 = 2mm; the spacing between the first tube 1 and the third coil 303 of the convex coil group is equal to the spacing between the second tube 2 and the third coil 303 of the convex coil group, both set to 2mm; the third coil 303 adopts a double-layer structure, and the number of turns of the lower coil is the same as the number of turns of the upper coil. The specific number of turns can be determined according to the inner diameter of the first tube 1. r Inner diameter of 1 and the second pipe fitting 2 r 2. Adjustments are made.
[0037] like Figure 1 As shown, the concurrent dual-tube electromagnetic flanging method using convex coil groups includes the following steps:
[0038] Step 1: Determine the inner diameter and number of turns of the first coil, second coil, and third coil according to the size and forming specifications of the first and second pipe fittings, and then manufacture the first coil, second coil, and third coil.
[0039] Step 2: Align the axes of the first coil, the second coil, and the third coil, and fix the first coil and the second coil to both sides of the third coil respectively to form a convex coil group;
[0040] Step 3: Fix the first pipe fitting with the first mold, and set a convex coil group near the flange area of the first pipe fitting. The axis of the convex coil group is aligned with the axis of the first pipe fitting, and the first coil of the convex coil group overlaps axially with the flange area of the first pipe fitting.
[0041] Step 4: Adjust the convex coil group. Control the distance between the third coil of the convex coil group and the first tube according to the forming specifications of the first tube. After the distance adjustment is completed, fix the convex coil group.
[0042] Step 5: Place a second tube near the second coil of the convex coil group. The axis of the second tube is aligned with the axis of the convex coil group, and the flanged area of the second tube overlaps axially with the second coil of the convex coil group. Fix the second tube using a second mold.
[0043] Step 6: Connect the first coil, second coil, and third coil to the coil power supply via switches respectively;
[0044] Step 7: Control the switch to energize the first, second, and third coils. The first and second tubes are flipped under the electromagnetic force of the convex coil group. After flipping, the coil power supply is disconnected.
[0045] The double-pipe flange effect in the embodiment is as follows: Figure 2 As shown.
[0046] Example 2
[0047] The dual-pipe electromagnetic flanging device in Embodiment 2 is the same as that in Embodiment 1.
[0048] like Figure 3 As shown, the inner diameter of the first pipe fitting 1 r 1 and the second fitting 2 r 2 are equal, that is r 1= r 2; Length of the flanged area 101 of the first pipe fitting l 1. Length of the flanged area 201 of the second fitting l 2 are not equal, that is l 1≠ l 2; The distance between the first tube 1 and the first coil 301 of the convex coil group d The distance between 1 and the second tube 2 and the second coil 302 of the convex coil group d 2 are equal, both set to 2mm, that is d 1= d2 = 2mm; the distance between the first tube 1 and the third coil 303 of the convex coil group is set to 2mm, and the distance between the second tube 2 and the third coil 303 of the convex coil group is set to 1mm; the third coil 303 adopts a double-layer structure, and the number of turns of the lower coil is the same as the number of turns of the upper coil. The specific number of turns can be determined according to the inner diameter of the first tube 1. r Inner diameter of 1 and the second pipe fitting 2 r 2. Adjustments are made.
[0049] The concurrent dual-tube electromagnetic flanging method using convex coil groups includes the following steps:
[0050] Step 1: Determine the inner diameter and number of turns of the first coil, second coil, and third coil according to the size and forming specifications of the first and second pipe fittings, and then manufacture the first coil, second coil, and third coil.
[0051] Step 2: Align the axes of the first coil, the second coil, and the third coil, and fix the first coil and the second coil to both sides of the third coil respectively to form a convex coil group;
[0052] Step 3: Fix the first pipe fitting with the first mold, and set a convex coil group near the flange area of the first pipe fitting. The axis of the convex coil group is aligned with the axis of the first pipe fitting, and the first coil of the convex coil group overlaps axially with the flange area of the first pipe fitting.
[0053] Step 4: Adjust the convex coil group. Control the distance between the third coil of the convex coil group and the first tube according to the forming specifications of the first tube. After the distance adjustment is completed, fix the convex coil group.
[0054] Step 5: Place a second tube near the second coil of the convex coil group. The axis of the second tube is aligned with the axis of the convex coil group, and the flanged area of the second tube overlaps axially with the second coil of the convex coil group. Fix the second tube using a second mold.
[0055] Step 6: Connect the first coil, second coil, and third coil to the coil power supply via switches respectively;
[0056] Step 7: Control the switch to energize the first, second, and third coils. The first and second tubes are flipped under the electromagnetic force of the convex coil group. After flipping, the coil power supply is disconnected.
[0057] Step 8: Determine whether the flanging of the first pipe meets the forming specifications. If it does, proceed to step 9. If it does not meet the forming specifications, control the switch to energize the first and third coils, and flang the first pipe again. After flanging, disconnect the coil power supply and determine again whether the flanging effect meets the forming requirements. Proceed to step 8.
[0058] Step 9: Determine whether the flanging of the second pipe meets the forming specifications. If it does, the process ends. If it does not meet the forming specifications, control the switch to energize the second and third coils and flanging the second pipe again. After flanging, disconnect the coil power supply and determine again whether the flanging effect meets the forming specifications. Then execute step 9.
[0059] The double-pipe flange effect in the embodiment is as follows: Figure 4 As shown.
[0060] Example 3
[0061] The dual-pipe electromagnetic flanging device in Embodiment 3 is the same as that in Embodiment 1.
[0062] like Figure 5 As shown, the inner diameter of the first pipe fitting 1 r 1 and the second fitting 2 r 2 are not equal, that is r 1≠ r 2; Length of the flanged area 101 of the first pipe fitting l 1. Length of the flanged area 201 of the second fitting l 2 are equal, that is l 1= l 2; The distance d1 between the first tube 1 and the first coil 301 of the convex coil group is equal to the distance d2 between the second tube 2 and the second coil 302 of the convex coil group, both set to 2mm, i.e., d1 = d2 = 2mm; The distance between the first tube 1 and the third coil 303 of the convex coil group is equal to the distance between the second tube 2 and the third coil 303 of the convex coil group, both set to 2mm; The third coil 303 adopts a double-layer structure, and the number of turns of the lower coil is higher than that of the upper coil, so as to ensure that both the first tube 1 and the second tube 2 can be subjected to a sufficiently large axial electromagnetic force to complete the flanging and molding process.
[0063] The electromagnetic flanging method for dual-pipe fittings in Example 3 is the same as that in Example 2.
[0064] The double-pipe flange effect in the embodiment is as follows: Figure 6 As shown.
[0065] Example 4
[0066] The dual-pipe electromagnetic flanging device in Example 4 is the same as that in Example 1.
[0067] like Figure 7 As shown, the inner diameter of the first pipe fitting 1 r 1 and the second fitting 2 r 2 are not equal, that is r 1 ≠ r 2; Length of the flanged area 101 of the first pipe fitting l 1. Length of the flanged area 201 of the second fittingl 2 are not equal, that is l 1≠ l 2; The distance d1 between the first tube 1 and the first coil 301 of the convex coil group is equal to the distance d2 between the second tube 2 and the second coil 302 of the convex coil group, both set to 2mm, i.e., d1 = d2 = 2mm; The distance between the first tube 1 and the third coil 303 of the convex coil group is set to 3mm, and the distance between the second tube 2 and the third coil 303 of the convex coil group is set to 1mm; The third coil 303 adopts a double-layer structure, and the number of turns of the lower coil is higher than that of the upper coil, so as to ensure that both the first tube 1 and the second tube 2 can be subjected to a sufficiently large axial electromagnetic force to complete the flanging and molding process.
[0068] The electromagnetic flanging method for dual-pipe fittings in Example 4 is the same as that in Example 2.
[0069] The double-pipe flange effect in the embodiment is as follows: Figure 8 As shown.
Claims
1. A concurrent dual-tube electromagnetic flanging method using convex coil groups, characterized in that: The dual-pipe fitting includes a first pipe fitting and a second pipe fitting with collinear axes. A convex coil assembly is disposed between the first and second pipe fittings, with the axis of the convex coil assembly aligned with the axes of the first and second pipe fittings. The convex coil assembly includes a first coil, a second coil, and a third coil with collinear axes. The first coil provides radial electromagnetic force to the flanged area of the first pipe fitting. The second coil is used to provide radial electromagnetic force to the flanged area of the second pipe fitting, and the third coil is used to provide axial electromagnetic force to the first and second pipe fittings. Length of the flanged area of the first pipe fitting l Length of the flanged area of the first and second fittings l 2 are not equal, that is l 1≠ l 2; The inner diameter of the first pipe fitting r 1 and the second pipe fitting r 2 are not equal, and r1 < r 2; The third coil adopts a double-layer structure, and the number of turns of the lower coil is higher than that of the upper coil; The concurrent dual-pipe electromagnetic flanging method includes the following steps: Step 1: Determine the inner diameter and number of turns of the first coil, second coil, and third coil according to the size and forming specifications of the first and second pipe fittings, and then manufacture the first coil, second coil, and third coil. Step 2: Align the axes of the first coil, the second coil, and the third coil, and fix the first coil and the second coil to both sides of the third coil respectively to form a convex coil group; Step 3: Fix the first pipe fitting with the first mold, and set a convex coil group near the flange area of the first pipe fitting. The axis of the convex coil group is aligned with the axis of the first pipe fitting, and the first coil of the convex coil group overlaps axially with the flange area of the first pipe fitting. Step 4: Adjust the convex coil group. Control the distance between the third coil of the convex coil group and the first tube according to the forming specifications of the first tube. After the distance adjustment is completed, fix the convex coil group. Step 5: Place a second tube near the second coil of the convex coil group. The axis of the second tube is aligned with the axis of the convex coil group, and the flanged area of the second tube overlaps axially with the second coil of the convex coil group. Fix the second tube using a second mold. Step 6: Connect the first coil, second coil, and third coil to the coil power supply via switches respectively; Step 7: Control the switch to energize the first, second, and third coils. The first and second tubes are flipped under the electromagnetic force of the convex coil group. After flipping, the coil power supply is disconnected. Step 8: Determine whether the flanging of the first pipe meets the forming specifications. If it does, proceed to the next step. If it does not meet the forming specifications, control the switch to energize the first and third coils, and flang the first pipe again. After flanging, disconnect the coil power supply and determine again whether the flanging effect meets the forming specifications. Step 9: Determine whether the flanging of the second pipe meets the forming specifications. If it does, the process ends. If it does not meet the forming specifications, control the switch to energize the second and third coils and flanging the second pipe again. After flanging, disconnect the coil power supply and determine again whether the flanging effect meets the forming specifications.
2. The concurrent dual-pipe electromagnetic flanging method according to claim 1, characterized in that, Axial height of the first coil of the convex coil group h 1 and the length of the flanged area of the first pipe fitting l 1. Satisfies the following relationship: l 1< h 1< l 1+2mm。 3. The concurrent dual-pipe electromagnetic flanging method according to claim 1, characterized in that, Axial height of the second coil of the convex coil group h 2 and the length of the flanged area of the second pipe fitting l 2. Satisfy the following relationship: l 2< h 2< l 2+2mm。 4. The concurrent dual-pipe electromagnetic flanging method according to claim 1, characterized in that, The spacing between the first tube and the first coil of the convex coil group d 1. Spacing between the second tube and the second coil of the convex coil group d 2 are equal, that is d 1 = d 2.