Electromagnetic pipe fitting bulging device and method based on composite shielding ring
Through the electromagnetic fitting expansion device of the composite shielding ring, the Lorentz force distribution is regulated, which solves the unevenness problem in the expansion of traditional electromagnetic fittings, and achieves uniform expansion and flexible forming of the pipe fittings, reducing manufacturing complexity and cost.
Patent Information
- Application Number
- CN202510749286.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2025-08-19
AI Technical Summary
In the expansion of traditional electromagnetic pipe fittings, the Lorentz force distribution is uneven, resulting in the expansion of the pipe fittings in an axial manner, and the multi-coil or concave coil method increases the manufacturing difficulty and cost.
The electromagnetic fitting expansion device using a composite shielding ring regulates the Lorentz force distribution through the combination of the inner and outer rings, so that the pipe fittings are formed uniformly at different forming heights, and the concave and convex composite electromagnetic shielding rings produce different shielding effects.
The uniformity of the pipe fittings' expansion results and the flexibility of forming height are achieved, which reduces manufacturing difficulty and cost and improves energy utilization.
Smart Images
Figure CN120502631A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of electromagnetic forming of metal materials, and in particular to an electromagnetic tube bulging device and method based on a composite shielding ring. Background Art
[0002] Electromagnetic pulse processing (EMP), a novel forming process, achieves ultra-high-speed deformation of materials through high-energy pulsed magnetic fields. This technology effectively overcomes the limitations of traditional processing of lightweight alloys. During transient loading, material deformation rates can exceed 300 m / s, significantly expanding the metal's plastic deformation range. Experimental data demonstrates that this forming process enables metals to deform at high strain rates within microseconds, improving the forming limit by over 40% compared to quasi-static stamping processes.
[0003] Aluminum alloys, with their low density, high strength, and excellent overall performance, hold broad application prospects in a wide range of fields, including aerospace and automotive. In recent years, numerous researchers have conducted extensive research in the field of electromagnetic forming. However, the Lorentz force generated by the electromagnetic coils in traditional tube bulging exhibits a distribution characteristic of being large in the center and small at the ends. This end effect can cause uneven axial expansion of the tube. Regulating the Lorentz force distribution and improving workpiece deformation uniformity are currently pressing challenges.
[0004] Currently, there are methods to improve the uniformity of tube expansion by using multiple coils and concave coils, but this will inevitably lead to the complication of the structure of the electromagnetic coil, which will increase the manufacturing difficulty and cost exponentially. Summary of the Invention
[0005] To this end, the present invention provides an electromagnetic tube expansion device and method based on composite shielding rings. When using conventional composite electromagnetic shielding rings, this tube expansion device applies a radial Lorentz force to the tube axially, with a smaller force in the center and a larger force at the ends, resulting in more uniform tube expansion. When using concave and convex composite electromagnetic shielding rings, this device can produce different shielding effects within a set of composite electromagnetic shielding rings, achieving a more precise and effective Lorentz force distribution. This ensures excellent tube forming uniformity at various forming heights.
[0006] In order to achieve the above-mentioned purpose, the present application provides an electromagnetic tube expansion device based on a composite shielding ring, and the tube expansion device based on the composite electromagnetic shielding ring is composed of a supporting base, upper and lower positioning rings, an expansion tube, an electromagnetic coil, an inner ring (conventional, concave and convex), an outer ring, a pulse power supply and a discharge switch.
[0007] The support base and upper and lower positioning rings are made of high-strength, highly malleable epoxy resin. The support base features grooves that mate with the bulge fittings, stabilizing the overall stability of the device. The upper and lower positioning rings should be approximately the same thickness as the gap between the electromagnetic coil and the bulge fitting, and their height should allow for the size of the composite electromagnetic shielding ring. This allows them to simultaneously position the electromagnetic coil, bulge fitting, and composite electromagnetic shielding ring.
[0008] The inner ring is made of a high-conductivity material (e.g., copper) and can provide good electromagnetic shielding effects. When the inner ring is concave or convex, different shielding effects can be achieved on a set of composite electromagnetic shielding rings.
[0009] The outer ring is made of a material with high yield strength and high resistivity (e.g. titanium alloy). Since the material is less affected by the magnetic field, it is possible to reduce the thickness of the electromagnetic shielding ring, thereby significantly improving energy utilization.
[0010] The material of the bulging tube is aluminum alloy tube;
[0011] The pulse power supply is connected to the electromagnetic coil via the discharge switch to generate a transient magnetic field, so that a surrounding induced current is formed on the inner surface of the inner ring.
[0012] Optionally, the inner ring is used to regulate the axial Lorentz force distribution, and the outer ring is used to constrain the deformation of the inner ring.
[0013] Optionally, when the inner ring is conventional, the expanded tube is subjected to radial Lorentz forces that are high at both ends and low in the middle during the processing.
[0014] Optionally, when the inner ring is concave and convex, the expanded tube will be subjected to a more precise and effective Lorentz force during the processing, that is, the concave shielding ring will increase the middle Lorentz force, and the convex shielding ring will further reduce the middle Lorentz force.
[0015] A second aspect of the present application provides an electromagnetic tube bulging method based on a composite shielding ring, which is applicable to the electromagnetic tube bulging device requirements of any of the composite shielding rings described above. The tube bulging method based on the composite electromagnetic shielding ring comprises the following steps:
[0016] S1. Combining the inner ring and the outer ring into a composite electromagnetic shielding ring, and then inserting the composite electromagnetic shielding ring into the electromagnetic coil;
[0017] S2. Insert the upper and lower positioning rings into the electromagnetic coil to ensure that the composite electromagnetic shielding ring is positioned in the middle of the electromagnetic coil;
[0018] S3. Insert the bulging tube into the electromagnetic coil. Since the thickness of the upper and lower positioning rings is equivalent to the gap between the electromagnetic coil and the bulging tube, the bulging tube is now positioned. Then place the entire assembly into the groove of the support base to prevent it from tipping over during the bulging process.
[0019] S4. After all parts are installed, connect the energized part (electromagnetic coil) corresponding to the experimental scheme to the pulse power supply via the discharge switch;
[0020] S5. Control the discharge switch to supply power to the energized part (electromagnetic coil), thereby generating an induced current on the surface of the corresponding inductive part (composite electromagnetic shielding ring, bulging tube), so that the composite electromagnetic shielding ring shields the magnetic field in the middle of the electromagnetic coil, thereby achieving uniform bulging of the tube to be formed;
[0021] S6. After the experiment is completed, remove the support base and disassemble the formed pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] To facilitate the description of the embodiments of this application or related technical solutions, the following briefly introduces the drawings required for the embodiments and related technical descriptions. The following drawings are merely examples of the embodiments of this application. Those skilled in the art can derive other related diagrams based on the provided drawings without additional creative effort.
[0023] Figure 1 Schematic diagram of the tube expansion device and the current and Lorentz force distribution of the conventional composite electromagnetic shielding ring provided in the embodiment of the present application;
[0024] Figure 2 A schematic structural diagram of a conventional composite electromagnetic shielding ring provided in an embodiment of the present application;
[0025] Figure 3 The tube bulging results of a conventional composite electromagnetic shielding ring under different discharge voltages (low, moderate, and high) provided in the embodiments of the present application;
[0026] Figure 4 A schematic structural diagram of a concave composite electromagnetic shielding ring provided in an embodiment of the present application;
[0027] Figure 5 Schematic diagram of the tube expansion device and the current and Lorentz force distribution of the concave composite electromagnetic shielding ring provided in an embodiment of the present application;
[0028] Figure 6 Comparison of tube bulging results of a conventional composite electromagnetic shielding ring and a concave composite electromagnetic shielding ring under low voltage provided in the embodiments of the present application;
[0029] Figure 7 A schematic structural diagram of a convex composite electromagnetic shielding ring provided in an embodiment of the present application;
[0030] Figure 8 Schematic diagram of the tube expansion device and the current and Lorentz force distribution of the convex composite electromagnetic shielding ring provided in an embodiment of the present application;
[0031] Figure 9 Comparison of the tube bulging results of a conventional composite electromagnetic shielding ring and a convex composite electromagnetic shielding ring under high voltage provided in the embodiments of the present application;
[0032] Figure 10 Comparison of tube expansion results of special-shaped (concave-convex) composite electromagnetic shielding rings under different discharge voltages (low, moderate, and high) provided in the embodiments of the present application. DETAILED DESCRIPTION
[0033] Below, the technical solutions in the embodiments will be explained in detail and clearly in conjunction with the drawings in the embodiments of this application. It should be clear that the embodiments described here are only part of the application content and not all embodiments. Based on the embodiments of this application, other implementation methods that can be obtained by ordinary technicians in this field without creative work should be included in the protection scope of this application.
[0034] See also Figure 1 , Figure 1 Schematic diagram of the tube expansion device using a composite electromagnetic shielding ring with a conventional inner ring provided in the embodiment of the present application, and a schematic diagram of the current and Lorentz force distribution. The conventional inner ring has a smooth inner wall without grooves or protrusions, and includes: a support base 1, upper and lower positioning rings 2, an expansion tube 3, an electromagnetic coil 4, a conventional inner ring 5, an outer ring 6, a pulse power supply and a discharge switch. The conventional inner ring 5 and the outer ring 6 are combined into a conventional composite electromagnetic shielding ring, and the composite electromagnetic shielding ring is inserted into the electromagnetic coil 4. The upper and lower positioning rings 2 are then inserted into the electromagnetic coil 4 to ensure that the composite electromagnetic shielding ring is positioned in the middle of the electromagnetic coil 4. The expansion tube 3 is then inserted into the electromagnetic coil 4. Since the thickness of the upper and lower positioning rings 2 is equivalent to the gap between the electromagnetic coil 4 and the expansion tube 3, the expansion tube 3 is also positioned at this time. Finally, the whole is placed in the groove of the support base 1 to ensure that it does not tip over during the tube expansion process. Due to the effect of the composite electromagnetic shielding ring, Figure 1 It can be clearly seen that the current and Lorentz force in the middle of the pipe are weakened, changing from the traditional "large in the middle and small at both ends" distribution characteristics to "large at both ends and small in the middle" distribution characteristics.
[0035] See also Figure 2 , Figure 2Schematic diagram of the structure of a composite electromagnetic shielding ring using a conventional inner ring provided in an embodiment of the present application. The outer ring 6 is inserted into the conventional inner ring 5 to form a conventional composite electromagnetic shielding ring. The conventional inner ring 5 is made of a high conductivity material (for example, but not limited to copper) and can have a good electromagnetic shielding effect. The outer ring 6 is made of a high yield strength and high resistivity material (for example, but not limited to titanium alloy). Since this material is less affected by the magnetic field, it is possible to reduce the thickness of the electromagnetic shielding ring, thereby significantly improving energy utilization.
[0036] See also Figure 3 , Figure 3 The bulging results of the pipe fittings using the composite electromagnetic shielding ring under different discharge voltages (low, moderate, and high) provided in the embodiment of the present application are shown. The inner ring in the figure is a conventional inner ring. It can be clearly seen that the bulging results of the pipe fittings with the composite electromagnetic shielding ring added are greatly affected by the voltage change. When the discharge voltage is low, the bulging result of the pipe fitting is concave; when the discharge voltage is high, the bulging result of the pipe fitting is convex; only when the discharge voltage is moderate, the bulging result of the pipe fitting is a uniform flat top. This shows that the bulging of the pipe fittings using the composite electromagnetic shielding ring with a conventional inner ring is limited by the discharge voltage, and the uniform forming height of the pipe fittings is also limited.
[0037] See also Figure 4 , Figure 4 This diagram illustrates the structure of a composite electromagnetic shielding ring using a concave inner ring. The concave inner ring has a circumferential groove along its inner wall. An outer ring 6 is inserted into the concave inner ring 5.1 to form the concave composite electromagnetic shielding ring. Compared to composite electromagnetic shielding rings using conventional inner rings, the concave composite electromagnetic shielding ring has a thinner center section, which reduces the shielding effectiveness of the central portion of the ring.
[0038] See also Figure 5 , Figure 5 Schematic diagram of the pipe expansion device and the current and Lorentz force distribution diagram of the composite electromagnetic shielding ring with a concave inner ring provided in the embodiment of the present application. Figure 1 The conventional composite electromagnetic shielding ring pipe bulging device and the composite electromagnetic shielding ring pipe bulging device using a concave inner ring only replace the composite electromagnetic shielding ring using a conventional inner ring with a composite electromagnetic shielding ring using a concave inner ring, and the rest of the structure remains unchanged. Due to the effect of the composite electromagnetic shielding ring using a concave inner ring, Figure 5 It can be seen that compared with Figure 1 The current and Lorentz force distribution characteristics of the pipe are shown in Figure 2. At this time, the current and Lorentz force in the middle of the pipe increase.
[0039] See also Figure 6 , Figure 6 By comparing the expansion results of the pipe fittings using a composite electromagnetic shielding ring with a conventional inner ring and a composite electromagnetic shielding ring with a concave inner ring under low voltage provided in the embodiment of the present application, it can be clearly seen that when the discharge voltage is low voltage, the expansion result of the pipe fitting using the composite electromagnetic shielding ring with a conventional inner ring is concave. This is because the Lorentz force in the middle of the expanded pipe fitting is too small, while the composite electromagnetic shielding ring with a concave inner ring can effectively increase the Lorentz force in the middle of the expanded pipe fitting, thereby achieving a uniform flat-top expansion result of the pipe fitting under low voltage.
[0040] See also Figure 7 , Figure 7 This is a schematic diagram of the structure of a composite electromagnetic shielding ring using a convex inner ring. The inner wall of the convex inner ring has a circumferential protrusion. The outer ring 6 is inserted into the convex inner ring 5.2 to form the convex composite electromagnetic shielding ring. Compared to composite electromagnetic shielding rings using conventional inner rings, this one has a thickened center section, which improves the shielding effectiveness of the central portion of the electromagnetic shielding ring.
[0041] See also Figure 8 , Figure 8 Schematic diagram of the pipe expansion device using a composite electromagnetic shielding ring with a convex inner ring and a schematic diagram of the current and Lorentz force distribution provided in the embodiment of the present application. Figure 1 The pipe bulging device using a composite electromagnetic shielding ring with a conventional inner ring and the pipe bulging device using a composite electromagnetic shielding ring with a convex inner ring only replace the composite electromagnetic shielding ring with a conventional inner ring in the pipe bulging device with a composite electromagnetic shielding ring with a convex inner ring, and the rest of the structure remains unchanged. Due to the effect of the composite electromagnetic shielding ring with a convex inner ring, Figure 8 It can be seen that compared with Figure 1 The current and Lorentz force distribution characteristics of the pipe are shown in Figure 2. At this time, the current and Lorentz force in the middle of the pipe are further reduced.
[0042] See also Figure 9 , Figure 9 The following table compares the tube expansion results of a composite electromagnetic shielding ring using a conventional inner ring and a composite electromagnetic shielding ring using a convex inner ring under high voltage. It can be clearly seen that when the discharge voltage is high, the tube expansion result of the composite electromagnetic shielding ring using a conventional inner ring is convex. This is caused by the excessive Lorentz force in the middle of the expanded tube. The composite electromagnetic shielding ring using a convex inner ring can effectively reduce the Lorentz force in the middle of the expanded tube, thereby achieving a uniform flat-top tube expansion result under high voltage.
[0043] See also Figure 10 , Figure 10Comparison of tube bulging results using a composite electromagnetic shielding ring with a different profile (concave or convex) at different discharge voltages (low, moderate, and high) provided in the embodiments of this application. The figure clearly shows that the composite electromagnetic shielding ring with a different profile (concave or convex) can achieve a uniform flat-top tube bulging result at different discharge voltages (low, moderate, and high). Furthermore, due to the different discharge voltages (low, moderate, and high), the uniform forming height of the tube can also be freely selected, which greatly increases the flexibility of tube bulging.
[0044] The present application also provides an electromagnetic tube bulging method based on a composite shielding ring, which is applied to the aforementioned tube bulging device based on a composite electromagnetic shielding ring. The tube bulging method based on a composite electromagnetic shielding ring comprises the following steps:
[0045] S1. Combining the inner ring and the outer ring 6 into a composite electromagnetic shielding ring, and then inserting the composite electromagnetic shielding ring into the electromagnetic coil 4, wherein the inner ring is one of the conventional inner ring 5, the concave inner ring 5.1, and the convex inner ring 5.2;
[0046] S2. Insert the upper and lower positioning rings 2 into the electromagnetic coil 4 to ensure that the composite electromagnetic shielding ring is positioned in the middle of the electromagnetic coil 4;
[0047] S3. Insert the bulging tube 3 into the electromagnetic coil 4. Since the thickness of the upper and lower positioning rings 2 is equivalent to the gap between the electromagnetic coil 4 and the bulging tube 3, the bulging tube 3 is now positioned. Then place the entire assembly into the groove of the support base 1 to prevent it from tipping over during the bulging process.
[0048] S4. After all parts are installed, connect the energized part (electromagnetic coil 4) corresponding to the experimental scheme to the pulse power supply via the discharge switch;
[0049] S5. Control the discharge switch to supply power to the energized part (electromagnetic coil 4), thereby generating an induced current on the surface of the corresponding inductive part (composite electromagnetic shielding ring, bulging tube 4), so that the composite electromagnetic shielding ring shields the magnetic field in the middle of the electromagnetic coil, thereby achieving uniform bulging of the tube to be formed;
[0050] S6. After the experiment is completed, remove the support base and disassemble the formed pipe fittings.
[0051] To better understand the tube bulging method of the composite electromagnetic shielding ring, the implementation process of the tube bulging method of the composite electromagnetic shielding ring of the present invention will be described in detail below through the following specific embodiments.
[0052] Example 1
[0053] See also Figure 1 、 Figure 2 、 Figure 3 ;
[0054] The composite electromagnetic shielding ring of the embodiment adopts a conventional inner ring as shown in FIG. Figure 2 As shown, the composite electromagnetic shielding ring using a conventional inner ring is composed of a conventional inner ring 5 and an outer ring 6. The tooling position and the generated current and magnetic field are shown in FIG. Figure 1 As shown;
[0055] During the processing, current is applied to the electromagnetic coil 4, and the electromagnetic coil 4 and the conventional composite electromagnetic shielding ring generate a spatial magnetic field after induction. The tube is deformed by the magnetic field force, and the purpose of expanding the tube 3 is finally achieved;
[0056] The specific implementation steps are as follows:
[0057] Step 1: Combine the conventional inner ring 5 and the outer ring 6 into a composite electromagnetic shielding ring, and then insert the composite electromagnetic shielding ring into the electromagnetic coil 4;
[0058] Step 2: Insert the upper and lower positioning rings 2 into the electromagnetic coil 4 to ensure that the composite electromagnetic shielding ring is positioned in the middle of the electromagnetic coil 4;
[0059] Step 3: Insert the bulging tube 3 into the electromagnetic coil 4. Since the thickness of the upper and lower positioning rings 2 is equivalent to the gap between the electromagnetic coil 4 and the bulging tube 3, the bulging tube 3 is now positioned. Then place the entire assembly into the groove of the support base 1 to prevent it from tipping over during the bulging process.
[0060] Step 4: After all parts are installed, connect the energized part (electromagnetic coil 4) corresponding to the experimental scheme to the pulse power supply via the discharge switch;
[0061] Step 5: Control the discharge switch to supply power to the energized part (electromagnetic coil 4), thereby forming an induced current on the surface of the corresponding inductive part (composite electromagnetic shielding ring, bulging tube 3), so that the composite electromagnetic shielding ring shields the magnetic field in the middle of the electromagnetic coil 4, thereby achieving uniform bulging of the tube to be formed;
[0062] Step 6: After the experiment is completed, remove the support base and disassemble the formed pipe.
[0063] Example 2
[0064] See also Figure 4 、 Figure 5 、 Figure 6 ;
[0065] The tooling parts of the embodiment are different from those of Example 1. The composite electromagnetic shielding ring using a conventional inner ring in Example 1 is replaced by a composite electromagnetic shielding ring using a concave inner ring, and other parts remain unchanged.
[0066] The specific implementation steps are as follows:
[0067] Step 1: Combine the concave inner ring 5.1 and the outer ring 6 into a composite electromagnetic shielding ring, and then insert the composite electromagnetic shielding ring into the electromagnetic coil 4;
[0068] Step 2: Insert the upper and lower positioning rings 2 into the electromagnetic coil 4 to ensure that the composite electromagnetic shielding ring is positioned in the middle of the electromagnetic coil 4;
[0069] Step 3: Insert the bulging tube 3 into the electromagnetic coil 4. Since the thickness of the upper and lower positioning rings 2 is equivalent to the gap between the electromagnetic coil 4 and the bulging tube 3, the bulging tube 3 is now positioned. Then place the entire assembly into the groove of the support base 1 to prevent it from tipping over during the bulging process.
[0070] Step 4: After all parts are installed, connect the energized part (electromagnetic coil 4) corresponding to the experimental scheme to the pulse power supply via the discharge switch;
[0071] Step 5: Control the discharge switch to supply power to the energized part (electromagnetic coil 4), thereby forming an induced current on the surface of the corresponding inductive part (composite electromagnetic shielding ring, bulging tube 3), so that the composite electromagnetic shielding ring shields the magnetic field in the middle of the electromagnetic coil 4, thereby achieving uniform bulging of the tube to be formed;
[0072] Step 6: After the experiment is completed, remove the support base and disassemble the formed pipe.
[0073] Example 3
[0074] See also Figure 7 、 Figure 8 、 Figure 9 ;
[0075] The tooling parts of the embodiment are different from those of Example 1. The composite electromagnetic shielding ring using a conventional inner ring in Example 1 is replaced by a composite electromagnetic shielding ring using a convex inner ring, and other parts remain unchanged.
[0076] The specific implementation steps are as follows:
[0077] Step 1: Combine the convex inner ring 5.2 and the outer ring 6 into a composite electromagnetic shielding ring, and then insert the composite electromagnetic shielding ring into the electromagnetic coil 4;
[0078] Step 2: Insert the upper and lower positioning rings 2 into the electromagnetic coil 4 to ensure that the composite electromagnetic shielding ring is positioned in the middle of the electromagnetic coil 4;
[0079] Step 3: Insert the bulging tube 3 into the electromagnetic coil 4. Since the thickness of the upper and lower positioning rings 2 is equivalent to the gap between the electromagnetic coil 4 and the bulging tube 3, the bulging tube 3 is now positioned. Then place the entire assembly into the groove of the support base 1 to prevent it from tipping over during the bulging process.
[0080] Step 4: After all parts are installed, connect the energized part (electromagnetic coil 4) corresponding to the experimental scheme to the pulse power supply via the discharge switch;
[0081] Step 5: Control the discharge switch to supply power to the energized part (electromagnetic coil 4), thereby forming an induced current on the surface of the corresponding inductive part (composite electromagnetic shielding ring, bulging tube 3), so that the composite electromagnetic shielding ring shields the magnetic field in the middle of the electromagnetic coil 4, thereby achieving uniform bulging of the tube to be formed;
[0082] Step 6: After the experiment is completed, remove the support base and disassemble the formed pipe.
[0083] In summary, the present invention discloses an electromagnetic tube bulging device and method based on a composite shielding ring. The device comprises a support base 1, upper and lower positioning rings 2, a bulging tube 3, an electromagnetic coil 4, a conventional inner ring 5, an outer ring 6, a pulse power supply, and a discharge switch. During processing, a current is applied to the electromagnetic coil 4. This pulsed current generates a spatial magnetic field, which in turn, along with the composite electromagnetic shielding ring, deforms the tube due to the magnetic field, ultimately completing the bulging process.
[0084] Due to the special structure of the special-shaped (concave or convex) composite electromagnetic shielding ring, uniform expansion of the pipe can be achieved under different discharge voltages (low, moderate, high), such as Figure 10 In addition, the uniform forming height of the tube can also be freely selected, which will greatly improve the flexibility of tube bulging.
[0085] In summary, the above content is only a specific description of the preferred embodiments of the present invention, but its scope of protection is not limited thereto. Within the scope of the technical solution disclosed in the present invention, any reasonable changes, replacements or equivalent improvements that can be implemented by ordinary technicians in this field without creative work should be included in the scope of protection of the present invention.
[0086] The above examples are typical embodiments of the core technical solution of the present invention and should not be considered as the sole limitation on the scope of protection of the invention. Any adaptive improvements, equivalent technical means replacements, or optimizations based on the innovative concepts and technical principles of the present invention shall be included in the scope of protection of this patent.
[0087] It should be noted that the terms such as "first" and "second" mentioned in this article are mainly used to distinguish different entities or operations, and do not imply a specific actual connection or sequential relationship between them. In addition, the terms "include", "comprise" and their derivative expressions are meant to cover non-exclusive inclusion - that is, a process, method, product or equipment composed of several elements may contain other elements not explicitly mentioned in addition to the elements explicitly listed, or contain inherent elements necessary for the process, method, product or equipment. Unless otherwise specified, the expression "including an element" does not exclude the existence of other identical elements in the relevant process, method, product or equipment.
[0088] The various embodiments in this specification are described in a related manner. Similar content between the embodiments can be referenced across them, and the focus of each embodiment is on highlighting the differences between the other embodiments. In particular, the description of the system embodiment is relatively concise, as it shares the same principles as the method embodiment. For related content, please refer to the detailed explanation of the method embodiment.
[0089] The foregoing is merely an illustration of the embodiments of the present application and does not limit the scope of protection of this application. Any modifications, equivalent technical substitutions, or optimization improvements made by those skilled in the art based on their understanding of the core principles of this application that are consistent with the inventive concept shall be included in the scope of protection of the claims of this application.
Claims
1. An electromagnetic tube bulging device based on a composite shielding ring, characterized in that: The forming device used to control the distribution of Lorentz force in electromagnetic bulging consists of a support base, upper and lower positioning rings, bulging tubes, electromagnetic coils, inner rings, outer rings, pulse power supplies, and discharge switches. The inner ring is one of the following shapes: conventional, concave, and convex: The support base and the upper and lower positioning rings are made of epoxy resin with high strength and good plasticity. The support base is provided with a groove that fits in with the bulging tube, which plays a role in stabilizing the entire device. The thickness of the upper and lower positioning rings should be equivalent to the gap between the electromagnetic coil and the bulging tube, and the height should reserve the size of the composite electromagnetic shielding ring. In this way, they can simultaneously play a role in positioning the electromagnetic coil, the bulging tube and the composite electromagnetic shielding ring. The inner ring is made of a high-conductivity material and can have a good electromagnetic shielding effect. When the inner ring is concave or convex, different shielding effects can be achieved on a set of composite electromagnetic shielding rings. The outer ring is made of a material with high yield strength and high resistivity. Since the material is less affected by the magnetic field, it is possible to reduce the thickness of the electromagnetic shielding ring, thereby significantly improving energy utilization. The material of the bulging tube is aluminum alloy tube; The pulse power supply is connected to the electromagnetic coil via the discharge switch to generate a transient magnetic field, so that a surrounding induced current is formed on the inner surface of the inner ring.
2. The electromagnetic tube bulging device based on a composite shielding ring according to claim 1, characterized in that: The inner ring is used to regulate the axial Lorentz force distribution, and the outer ring is used to constrain the deformation of the inner ring; The inner ring is a copper ring, and the outer ring is a titanium alloy ring.
3. The electromagnetic tube bulging device based on a composite shielding ring according to claim 1, characterized in that: When the inner ring is conventional, the bulging tube is subjected to radial Lorentz forces that are high at both ends and low in the middle during the processing; The inner ring is a copper ring, and the outer ring is a titanium alloy ring.
4. The electromagnetic tube bulging device based on a composite shielding ring according to claim 1, characterized in that: When the inner ring is concave or convex, the expanded tube will be subjected to a more precise and effective Lorentz force during the processing. The concave inner ring will increase the middle Lorentz force, while the convex inner ring will further reduce the middle Lorentz force. The inner ring is a copper ring, and the outer ring is a titanium alloy ring.
5. A method for expanding electromagnetic tubes based on a composite shielding ring, characterized in that: The electromagnetic tube bulging device based on the composite shielding ring is applicable to any one of claims 1 to 4, wherein the electromagnetic tube bulging method based on the composite shielding ring comprises the following steps: S1. Combining the inner ring and the outer ring into a composite electromagnetic shielding ring, and then inserting the composite electromagnetic shielding ring into the electromagnetic coil; S2. Insert the upper and lower positioning rings into the electromagnetic coil to ensure that the composite electromagnetic shielding ring is positioned in the middle of the electromagnetic coil; S3. Insert the bulging tube into the electromagnetic coil. Since the thickness of the upper and lower positioning rings is equivalent to the gap between the electromagnetic coil and the bulging tube, the bulging tube is also positioned at this time. Then place the whole in the groove of the support base to ensure that it does not fall over during the tube expansion process; S4. After all parts are installed, connect the energized parts corresponding to the experimental plan to the pulse power supply via the discharge switch, wherein the energized parts are electromagnetic coils; S5. Controlling the discharge switch to supply power to the energized parts, generating an induced current on the surface of the corresponding inductive parts, so that the composite shielding ring shields the magnetic field in the middle of the electromagnetic coil, thereby achieving uniform bulging of the tube to be formed, wherein the inductive parts are the composite electromagnetic shielding ring and the bulging tube; S6. After the experiment is completed, remove the support base and disassemble the formed pipe fittings.