Reducing pipe electromagnetic forming device and forming method

Abstract

The invention discloses a reducing pipe electromagnetic forming device and method, the device comprises an inner cylinder, an outer cylinder and an electromagnetic forming unit, and the electromagnetic forming unit comprises a plurality of first electromagnetic forming tool heads and second electromagnetic forming tool heads; the outer side of the inner cylinder is coaxially sleeved with an outer cylinder, a plurality of first electromagnetic forming tool heads and a plurality of second electromagnetic forming tool heads are correspondingly arranged on the circumferential side of the inner cylinder and the circumferential side of the outer cylinder correspondingly, and a pipe blank to be treated is arranged between the opposite working ends of the first electromagnetic forming tool heads and the second electromagnetic forming tool heads. The other end of the first electromagnetic forming tool head and the other end of the second electromagnetic forming tool head are provided with a first driving mechanism and a second driving mechanism respectively. The pipe body machining device is simple in structure, flexible and controllable, can be suitable for machining of different pipe bodies, remarkably improves the machining efficiency and has good practicability.

Description

Technical Field

[0001] The present invention belongs to the technical field of reducing pipe forming, and particularly relates to a reducing pipe electromagnetic forming device and a forming method. Background Art

[0002] Electromagnetic forming is a special forming process that uses pulsed electromagnetic force to drive plastic deformation of workpieces. Its characteristics such as high strain rate and non-contact force application can significantly improve the forming limit of materials and suppress wrinkling and springback. Currently, it has been used to achieve the processing of reducing metal pipe fittings. For example, the existing patent CN117583457A discloses a reducing pipe electromagnetic forming device and a forming method, including: an electromagnetic forming module and a power supply module; the electromagnetic forming module includes: a forming coil and a metal shielding ring; the forming coil generates a magnetic field and induced eddy currents in the pipe fitting to be formed, and then generates electromagnetic force to drive the pipe fitting to be formed to deform; the metal shielding ring improves the electromagnetic force distribution at the end of the pipe fitting to be formed, enabling the pipe fitting to be formed to fit the mold from bottom to top along the mold, improving the mold-fitting performance of traditional reducing pipe electromagnetic forming. The present invention introduces a metal shielding ring at the end of the pipe fitting to improve the electromagnetic force field distribution on the pipe fitting, enabling the pipe fitting to fit the mold from bottom to top along the mold, and solving the problem of poor mold-fitting accuracy in traditional electromagnetic forming when processing reducing pipes. However, although this reducing pipe electromagnetic forming technology can meet the processing requirements of reducing pipes of different sizes, it is only applicable to pipe blanks (pipe fittings) with the same or basically the same pipe diameter. If electromagnetic forming processing needs to be carried out for pipe blanks (pipe fittings) of different specifications, multiple different specifications of forming coils and stainless steel molds need to be configured, and its cost in engineering applications is very high. Especially for multiple large-size reducing pipes with a minimum pipe diameter greater than DN350mm, the production process switching between only two different specifications of reducing pipes takes dozens of days; and it is only applicable to electromagnetic forming with the forming coil inside and the stainless steel mold outside, and cannot form reducing pipes with complex structures. Summary of the Invention

[0003] The purpose of the present invention is to provide a reducing pipe electromagnetic forming device and a forming method, aiming to solve the above problems.

[0004] The present invention is mainly realized through the following technical solutions: An electromagnetic forming device for a reducing pipe, comprising an inner cylinder, an outer cylinder and an electromagnetic forming unit. The electromagnetic forming unit includes a plurality of first electromagnetic forming tool heads and second electromagnetic forming tool heads. The outer side of the inner cylinder is coaxially sleeved with the outer cylinder, and a plurality of first electromagnetic forming tool heads and second electromagnetic forming tool heads are respectively arranged corresponding to the circumferences of the inner cylinder and the outer cylinder. A pipe blank to be processed is arranged between the working ends of the first electromagnetic forming tool head and the second electromagnetic forming tool head that face each other. The other ends of the first electromagnetic forming tool head and the second electromagnetic forming tool head are respectively provided with a first driving mechanism and a second driving mechanism, and the first driving mechanism and the second driving mechanism are respectively used to drive the first electromagnetic forming tool head and the second electromagnetic forming tool head to move linearly in the radial direction.

[0005] To better implement the present invention, further, it also includes an outer cylinder-shaped support and an inner cylinder-shaped support. The inner cylinder-shaped support is coaxially installed inside the inner cylinder, and the outer cylinder-shaped support is coaxially installed outside the outer cylinder. A plurality of first driving mechanisms and second driving mechanisms are respectively installed corresponding to the circumferences of the outer cylinder-shaped support and the inner cylinder-shaped support.

[0006] To better implement the present invention, further, it also includes a first distance sensor and a second distance sensor. The first distance sensor and the second distance sensor are respectively radially arranged on the first electromagnetic forming tool head and the second electromagnetic forming tool head. The first distance sensor is used to measure the distance from the reference point of the first electromagnetic forming tool head to the inner wall of the outer cylinder, and the second distance sensor is used to measure the distance from the reference point of the second electromagnetic forming tool head to the outer wall of the inner cylinder.

[0007] To better implement the present invention, further, a plurality of groups of electromagnetic forming units arranged in an array are respectively provided on the circumferences of the inner cylinder and the outer cylinder from top to bottom.

[0008] A method for electromagnetic forming of a reducing pipe, implemented based on the above-mentioned electromagnetic forming device for a reducing pipe, includes the following steps: Step S1: Based on the design model of the reducing pipe, n cross-sectional circles {C1, C2,..., Cn} of the design model of the reducing pipe are sequentially extracted from bottom to top, and the radii {r1, r2,..., r n} of the cross-sectional circles are obtained; Step S2: n groups of electromagnetic forming units are respectively provided corresponding to the n cross-sectional circles between the inner cylinder and the outer cylinder from top to bottom. Based on the set distance d 外 and the set distance d 内 , the positions of the first electromagnetic forming tool head and the second electromagnetic forming tool head in the n groups of electromagnetic forming units are positioned; Wherein: d 外 is the set distance from the first electromagnetic forming tool head to the inner wall of the outer cylinder; d 内is the set distance from the second electromagnetic forming tool head to the outer wall of the inner cylinder; Step S3: Sheath the tube blank around the periphery of the second electromagnetic forming tool head; Step S4: Activate the first electromagnetic forming tool head or the second electromagnetic forming tool head of the non-forming die to perform electromagnetic forming to obtain a stepped tube.

[0009] To better implement the present invention, further, in the step S2, the second electromagnetic forming tool head is used as the forming die, and the set distance d 外 and the set distance d 内 are calculated by the following formulas: d 外 = R 外筒 – r 管坯 – L1 (1) d 内 = r n – R 内筒 – L2 (2) where: R 外筒 is the radius of the inner wall of the outer cylinder; R 内筒 is the radius of the outer wall of the inner cylinder; r 管坯 is the radius of the tube blank; L1 is the preset distance value from the first electromagnetic forming tool head to the tube blank, and the tube blank is coaxially arranged with the inner cylinder; L2 is the preset distance value from the second electromagnetic forming tool head to the tube blank, and L2 = 0.

[0010] To better implement the present invention, further, the step S2 includes the following steps: Step A1: Use the first electromagnetic forming tool head or the second electromagnetic forming tool head as the forming die; [[ID=5]]Step A2: First, start the first driving mechanism to make the first electromagnetic forming tool head move radially to the set distance d 外 ; then, start the second driving mechanism to make the second electromagnetic forming tool head move radially to the set distance d 内 ; perform electromagnetic forming on the tube blank; Step A3: Repeat Step A1 and Step A2 until all n groups of electromagnetic forming units complete position positioning.

[0011] To better implement the present invention, further, in the step A3, when repeating Step A1 and Step A2, control the n groups of electromagnetic forming units to perform position positioning from bottom to top in sequence.

[0012] To better implement the present invention, further, the step S2 includes the following steps: Step B1: Use the first electromagnetic forming tool head or the second electromagnetic forming tool head as the forming die. Step B2: First, control all the first electromagnetic forming tool heads of the n groups of electromagnetic forming units to move radially to the set distance d 外 ; then, control all the second electromagnetic forming tool heads of the n groups of electromagnetic forming units to move radially to the set distance d 内 .

[0013] The beneficial effects of the present invention are as follows: For electromagnetic forming processing of pipe blanks (pipe fittings) of different specifications, the present invention significantly reduces the processing cost. For example, when processing the reducing pipe one with "the minimum pipe diameter DN350mm and the maximum pipe diameter DN400mm" and the reducing pipe two with "the minimum pipe diameter DN400mm and the maximum pipe diameter DN600mm", using the traditional electromagnetic forming processing method, only the production process switching takes about twenty days, while using the solution of the present invention, the production process switching only takes less than half a day, and there is no need to configure a variety of forming coils and stainless steel molds of different specifications, which is more conducive to large-scale application. The present invention is not only applicable to electromagnetic forming with the forming coil (electromagnetic forming tool head) built-in or external, but also can successfully form a reducing pipe with a complex structure, such as a reducing pipe with non-continuous reduced diameter.

[0014] The structure of the present invention is simple, flexible and controllable, and can be applied to the processing of different pipe bodies, significantly improving the processing efficiency and having good practicability. When the first electromagnetic forming tool head is used as the tool for providing electromagnetic forming force, the second electromagnetic forming tool head opposite to the first electromagnetic forming tool head serves as the forming die; when the second electromagnetic forming tool head is used as the tool for providing electromagnetic forming force, the first electromagnetic forming tool head opposite to the second electromagnetic forming tool head serves as the forming die. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the reducing pipe electromagnetic forming device of the present invention; Figure 2 is Figure 1 the axial sectional structural diagram of; Figure 3 is Figure 1 the top view of; Figure 4 is a schematic diagram of extracting the sectional circle based on the design model in Embodiment 3; Figure 5 is a schematic diagram of the state after the first electromagnetic forming tool head and the second electromagnetic forming tool head complete position positioning in Embodiment 3; Figure 6 is a schematic diagram of the state of forming a reducing pipe with non-continuous reduced diameter.

[0016] Wherein: 1 - first electromagnetic forming tool head, 2 - outer cylinder, 3 - second electromagnetic forming tool head, 4 - inner cylinder, 5 - first distance sensor, 6 - second distance sensor, 7 - cross-sectional circle, 8 - first driving mechanism, 9 - outer cylinder-shaped support, 10 - inner cylinder-shaped support, 11 - base, 12 - tube blank, 13 - second driving mechanism, 14 - design model, 15 - inclined surface profile. Specific embodiments

[0017] Embodiment 1: An electromagnetic forming device for a stepped tube, as Figures 1 to 3 shown, includes a first electromagnetic forming tool head 1. A plurality of first electromagnetic forming tool heads 1 are radially arranged on an outer cylinder 2, and a plurality of second electromagnetic forming tool heads 3 are radially arranged on an inner cylinder 4. The outer cylinder 2 and the inner cylinder 4 are coaxially arranged. Each first electromagnetic forming tool head 1 and each second electromagnetic forming tool head 3 can independently move radially and be fixed at a target position. The cylindrical space between the first electromagnetic forming tool head 1 and the second electromagnetic forming tool head 3 is used to accommodate a tube blank 12. When the first electromagnetic forming tool head 1 serves as a tool for providing electromagnetic forming force, the second electromagnetic forming tool head 3 opposite to the first electromagnetic forming tool head 1 serves as a forming die; when the second electromagnetic forming tool head 3 serves as a tool for providing electromagnetic forming force, the first electromagnetic forming tool head 1 opposite to the second electromagnetic forming tool head 3 serves as a forming die. The first electromagnetic forming tool head 1 and the second electromagnetic forming tool head 3 are both prior art. For example, the solution described in the existing patent CN116550847 is used, so details are not repeated here.

[0018] In this embodiment, the first electromagnetic forming tool head 1 and the second electromagnetic forming tool head 3 are respectively provided with a first driving mechanism 8 and a second driving mechanism 13. The driving mechanism can specifically adopt a lead screw transmission mechanism driven by a servo motor, and the driving mechanism is used to drive the electromagnetic forming tool head to move radially. Specifically, the first driving mechanism 8 of the first electromagnetic forming tool head 1 is installed on the outer cylinder-shaped support 9, and the second driving mechanism 13 of the second electromagnetic forming tool head 3 is installed on the inner cylinder-shaped support 10. The inner cylinder-shaped support 10, the outer cylinder-shaped support 9, the inner cylinder 4 and the outer cylinder 2 are all coaxially and fixedly installed on the base 11.

[0019] In this embodiment, a first distance sensor 5 is radially arranged on the first electromagnetic forming tool head 1, and a second distance sensor 6 is radially arranged on the second electromagnetic forming tool head 3. The first distance sensor 5 is used to measure the distance from its reference point to the inner wall of the outer cylinder 2, and the second distance sensor 6 is used to measure the distance from its reference point to the outer wall of the inner cylinder 4.

[0020] In this embodiment, the first electromagnetic forming tool head 1, the second electromagnetic forming tool head 3, the first driving mechanism 8, the second driving mechanism 13, the first distance sensor 5, and the second distance sensor 6 are all connected to the control system. Preferably, the control system includes a memory, a processor, and a program stored on the memory and executable on the processor. When the processor executes the program, the following functions are realized: Obtain the distance data fed back by the first distance sensor 5 and the second distance sensor 6 in real time; Control the operation of the first driving mechanism 8 and the second driving mechanism 13 to move the first electromagnetic forming tool head 1 and the second electromagnetic forming tool head 3 connected thereto to the target position; Control the start and stop of the first electromagnetic forming tool head 1 and the second electromagnetic forming tool head 3.

[0021] Embodiment 2: A method for forming a reducing pipe using the aforementioned electromagnetic forming device, the steps including: Step 1: Obtain the design model 14 of the reducing pipe, extract n cross-sectional circles {C1, C2,..., Cn} from the design model 14 of the reducing pipe, and obtain the radius of each cross-sectional circle 7. Each cross-sectional circle 7 corresponds to an electromagnetic forming tool head at the same height position; Step 2: In the direction from bottom to top, define the radius of the first cross-sectional circle C1 as r1, the radius of the second cross-sectional circle C2 as r2... and the radius of the nth cross-sectional circle Cn as r n , define the radius of the inner wall of the outer cylinder 2 as R 外筒 , define the radius of the outer wall of the inner cylinder 4 as R 内筒 ; Step 3: Use the second electromagnetic forming tool head 3 as the forming die, calculate the set distance d from the first electromagnetic forming tool head 1 to the inner wall of the outer cylinder 2 according to formula (1) 外 , calculate the set distance d from the second electromagnetic forming tool head 3 to the outer wall of the inner cylinder 4 according to formula (2) 内 ; d 外 = R 外筒 – r 管坯 –L1 (1) d 内 = r n – R 内筒 –L2 (2) In the formula, L1 represents the preset distance value from the first electromagnetic forming tool head 1 to the tube blank 12. The tube blank 12 is coaxially arranged with the inner cylinder 4 and the outer cylinder 2. L2 represents the preset distance value from the second electromagnetic forming tool head 3 to the tube blank 12; When the second electromagnetic forming tool head 3 is used as the forming die, L2 takes 0; Step 4: Activate the driving mechanism of the first electromagnetic forming tool head 1 to move the first electromagnetic forming tool head 1 radially. When the distance value feedback by the first distance sensor 5 is monitored to be equal to d 外 , control the driving mechanism of the first electromagnetic forming tool head 1 to stop; activate the driving mechanism of the second electromagnetic forming tool head 3 to move the second electromagnetic forming tool head 3 radially. When the distance value feedback by the second distance sensor 6 is monitored to be equal to d 内 , control the driving mechanism of the second electromagnetic forming tool head 3 to stop; One of the electromagnetic forming tool head adjustment solutions in this step: First, control the first electromagnetic forming tool head 1 corresponding to the first cross-sectional circle C1 to move radially to the corresponding target position, and the second electromagnetic forming tool head 3 corresponding to the first cross-sectional circle C1 to move radially to the corresponding target position; then control the first electromagnetic forming tool head 1 corresponding to the second cross-sectional circle C2 to move radially to the corresponding target position, and the second electromagnetic forming tool head 3 corresponding to the second cross-sectional circle C2 to move radially to the corresponding target position... until controlling the first electromagnetic forming tool head 1 and the second electromagnetic forming tool head 3 corresponding to the nth cross-sectional circle Cn to move radially to the corresponding target positions; Another electromagnetic forming tool head adjustment solution in this step: It is also possible to first control all the first electromagnetic forming tool heads 1 to move radially to the corresponding target positions, and then control all the second electromagnetic forming tool heads 3 to move radially to the corresponding target positions; Step 5: Fit the tube blank 12 around the periphery of the second electromagnetic forming tool head 3; Step 6: Activate the electromagnetic forming tool heads that are not used as forming dies, that is, activate the first electromagnetic forming tool head 1, and perform electromagnetic forming to obtain a stepped tube; Step 7: Control each electromagnetic forming tool head to reset and close, and then take out the stepped tube.

[0022] Embodiment 3: A method for electromagnetic forming of a stepped tube. The stepped tube is a concentric stepped tube with a specification of 800 mm (length) * DN600 mm (big end diameter) * 400 mm (small end diameter), and the specification of the used tube blank 12 is DN600 mm (r 管坯 = 300 mm). As Figure 5 shown, determined according to the size of the electromagnetic forming tool heads and the height of the concentric stepped tube, a total of nine layers of electromagnetic forming tool heads are required to synchronously perform forming. The specific steps include the following: As Figure 4 shown, pre-obtain the design model 14 of the concentric stepped tube, then extract nine cross-sectional circles 7 from the design model 14, and obtain the radius of each cross-sectional circle 7. Each cross-sectional circle 7 corresponds to an electromagnetic forming tool head at the same height position. The obtained cross-sectional circles 7 are as Figure 4As shown, each cross-sectional circle 7 corresponds to the corresponding positions of DN600, DN575, DN550, DN525, DN500, DN475, DN450, DN425, and DN400 in the figure; In the direction from bottom to top, define the radius of the first cross-sectional circle 7 as r1 (300 mm), the radius of the second cross-sectional circle 7 as r2 (287.5 mm) …… the radius of the ninth cross-sectional circle 7 as r9 (200 mm), and obtain the radius of the inner wall of the outer cylinder 2 as R 外筒 (800 mm, this radius is a fixed value), and the radius of the outer wall of the inner cylinder 4 as R 内筒 (100 mm, this radius is a fixed value); Step 3, use the second electromagnetic forming tool head 3 as the forming die, and calculate the set distance d from the first electromagnetic forming tool head 1 to the inner wall of the outer cylinder 2 according to formula (1) 外 and calculate the set distance d from the second electromagnetic forming tool head 3 to the outer wall of the inner cylinder 4 according to formula (2) 内 ; d 外 = R 外筒 – r 管坯 – L1 (1) d 内 = r n – R 内筒 – L2 (2) In the formula, L1 represents the preset distance value from the first electromagnetic forming tool head 1 to the cross-sectional circle 7 of the tube blank 12, and L2 represents the preset distance value from the second electromagnetic forming tool head 3 to the cross-sectional circle 7 of the tube blank 12; In this example, when the second electromagnetic forming tool head 3 is used as the forming die, L2 is taken as 0; Since the formed is a concentric reducing pipe, according to the specifications and wall thickness of the tube blank 12, the preset distance value L1 from all the first electromagnetic forming tool heads 1 to the surface of the tube blank 12 is preset as 30 mm. Taking the second electromagnetic forming tool head 3 as the forming die, then L2 is taken as 0; Thus, it is calculated that: The set distance from the first electromagnetic forming tool head 1 corresponding to the first cross-sectional circle 71 to the inner wall of the outer cylinder 2: d 外 is R 外筒 - r 管坯 – L1 = 800 - 300 - 30 = 470 mm; The set distance from the first electromagnetic forming tool head 1 corresponding to the second cross-sectional circle 72 to the inner wall of the outer cylinder 2: d 外 is R 外筒 – r 管坯 – L1 = 800 - 300 - 30 = 470 mm; Set distance from the first electromagnetic forming tool head 1 corresponding to the third cross-sectional circle 73 to the inner wall of the outer cylinder 2: d 外 is R 外筒 –r 管坯 –L1 = 800 - 300 - 30 = 470 mm; By analogy, the set distance d from the first electromagnetic forming tool head 1 corresponding to the ninth cross-sectional circle 7 to the inner wall of the outer cylinder 2 外 is R 外筒 –r 管坯 –L1 = 800 - 300 - 30 = 470 mm.

[0023] Set distance from the second electromagnetic forming tool head 3 corresponding to the first cross-sectional circle 71 to the outer wall of the inner cylinder 4: is r1–R 内筒 –L2 = 300 - 100 - 0 = 200 mm; Set distance from the second electromagnetic forming tool head 3 corresponding to the second cross-sectional circle 72 to the outer wall of the inner cylinder 4: is r2–R 内筒 –L2 = 287.5 - 100 - 0 = 187.5 mm; Set distance from the second electromagnetic forming tool head 3 corresponding to the third cross-sectional circle 73 to the outer wall of the inner cylinder 4: is r3–R 内筒 –L2 = 275 - 100 - 0 = 175 mm; By analogy, the set distance from the second electromagnetic forming tool head 3 corresponding to the ninth cross-sectional circle 7 to the outer wall of the inner cylinder 4 is r9–R 内筒 –L2 = 200 - 100 - 0 = 100 mm.

[0024] As Figure 5 shown, turn on the first driving mechanism 8 of the first electromagnetic forming tool head 1 to make the first electromagnetic forming tool head 1 move radially. When the distance value feedback by the first distance sensor 5 is monitored to be equal to d 外 control the first driving mechanism 8 of the first electromagnetic forming tool head 1 to stop. All the first electromagnetic forming tool heads 1 are located on the same circumference and have the same set distance from the inner wall of the outer cylinder 2; Turn on the second driving mechanism 13 of the second electromagnetic forming tool head 3 to make the second electromagnetic forming tool head 3 move radially. When the distance value feedback by the second distance sensor 6 is monitored to be equal to d 内 control the second driving mechanism 13 of the second electromagnetic forming tool head 3 to stop. All the second electromagnetic forming tool heads 3 are located on the inclined plane contour 15 corresponding to the concentric reducer.

[0025] Next, the tube blank 12 is sleeved around the second electromagnetic forming tool head 3, and the wall surface of the tube blank 12 is located between the first electromagnetic forming tool head 1 and the second electromagnetic forming tool head 3. Then, the electromagnetic forming tool head that is not used as a forming die is turned on (i.e., the first electromagnetic forming tool head 1 is turned on) for electromagnetic forming to obtain a concentric reducing pipe.

[0026] Control each electromagnetic forming tool head to reset and turn off, and then take out the concentric reducing pipe.

[0027] The above process only describes the reducing pipe with "the minimum pipe diameter DN400mm and the maximum pipe diameter DN600mm". If it is necessary to use this device to continue forming a reducing pipe with "the minimum pipe diameter DN350mm and the maximum pipe diameter DN400mm", it is mainly necessary to calculate and adjust the position of the corresponding second electromagnetic forming tool head 3 according to the foregoing steps, which is very convenient and fast. The foregoing steps are the solutions using the second electromagnetic forming tool head 3 as the forming die. If it is necessary to use the first electromagnetic forming tool head 1 as the forming die, only the corresponding calculation formula needs to be adjusted with reference to the foregoing steps.

[0028] In the embodiment of the present invention, the forming force of the first electromagnetic forming tool head 1 corresponding to each cross-sectional circle 7 is calculated and determined by those skilled in the art according to the forming distance (the distance between the first electromagnetic forming tool head 1 and the inclined surface contour 15 corresponding to the concentric reducing pipe). Refer to the idea in the foregoing steps and calculate the corresponding set distances d 内 、d 外 and other data, and adjust the first electromagnetic forming tool head 1 to the position as shown in Figure 6 , then a reducing pipe with non-continuous reduced diameter can be formed in one step.

[0029] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any simple modification and equivalent change made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An electromagnetic forming device for a reducing pipe, characterized in that It includes an inner cylinder, an outer cylinder and an electromagnetic forming unit. The electromagnetic forming unit includes a number of first electromagnetic forming tool heads and second electromagnetic forming tool heads. An outer cylinder is coaxially sleeved on the outside of the inner cylinder, and a number of first electromagnetic forming tool heads and second electromagnetic forming tool heads are respectively arranged on the circumferences of the inner cylinder and the outer cylinder. A tube blank to be processed is arranged between the opposite working ends of the first electromagnetic forming tool head and the second electromagnetic forming tool head. A first driving mechanism and a second driving mechanism are respectively arranged at the other ends of the first electromagnetic forming tool head and the second electromagnetic forming tool head. The first driving mechanism and the second driving mechanism are respectively used to drive the first electromagnetic forming tool head and the second electromagnetic forming tool head to move linearly in the radial direction.

2. The electromagnetic forming device for a reducing pipe according to claim 1, characterized in that, It further includes an outer cylinder-shaped support and an inner cylinder-shaped support. An inner cylinder-shaped support is coaxially installed inside the inner cylinder, and an outer cylinder-shaped support is coaxially installed outside the outer cylinder. A number of first driving mechanisms and second driving mechanisms are respectively installed on the circumferences of the outer cylinder-shaped support and the inner cylinder-shaped support.

3. An electromagnetic forming device for a reducing pipe according to claim 1, characterized in that, It further includes a first distance sensor and a second distance sensor. The first distance sensor and the second distance sensor are respectively arranged radially on the first electromagnetic forming tool head and the second electromagnetic forming tool head. The first distance sensor is used to measure the distance from the reference point of the first electromagnetic forming tool head to the inner wall of the outer cylinder, and the second distance sensor is used to measure the distance from the reference point of the second electromagnetic forming tool head to the outer wall of the inner cylinder.

4. An electromagnetic forming device for a reducing pipe according to any one of claims 1-3, characterized in that, On the circumferences of the inner cylinder and the outer cylinder, several groups of electromagnetic forming units are arranged in an array from top to bottom.

5. A method for electromagnetic forming of a reducing pipe, which is realized based on the reducing pipe electromagnetic forming device described in any one of claims 1-4, characterized in that, It includes the following steps: Step S1: Based on the design model of the reducer, extract the cross-sectional circles {C1, C2, …, Cn} of the design models of n reducers sequentially from bottom to top, and obtain the radii {r1, r2, …, r n}; Step S2: n groups of electromagnetic forming units are respectively arranged between the inner cylinder and the outer cylinder corresponding to n sectional circles from top to bottom; based on the set distance d 外 and the set distance d 内 , position the first electromagnetic forming tool head and the second electromagnetic forming tool head in the n groups of electromagnetic forming units; Where: d 外 is the set distance from the first electromagnetic forming tool head to the inner wall of the outer cylinder; d 内 is the set distance from the second electromagnetic forming tool head to the outer wall of the inner cylinder; Step S3: Sleeve the tube blank around the second electromagnetic forming tool head. Step S4: Turn on the first electromagnetic forming tool head or the second electromagnetic forming tool head of the non-forming die to perform electromagnetic forming to obtain a stepped tube.

6. A method for electromagnetic forming of a reducing pipe according to claim 5, characterized in that, In the step S2, the second electromagnetic forming tool head is used as a forming die, and the set distance d 外 and the set distance d 内 The calculation formula of is: d 外 = R 外筒 – r 管坯 – L1(1) d 内 = r n – R 内筒 – L2(2) Where: R 外筒 is the radius of the inner wall of the outer cylinder; R 内筒 is the radius of the outer wall of the inner cylinder; r 管坯 is the radius of the tube blank; L1 is the preset distance value from the first electromagnetic forming tool head to the tube blank, and the tube blank is coaxially arranged with the inner cylinder. L2 is the preset distance value from the second electromagnetic forming tool head to the tube blank, and L2 = 0.

7. A method for electromagnetic forming of a reducing pipe according to claim 5, characterized in that The step S2 includes the following steps: Step A1: Use the first electromagnetic forming tool head or the second electromagnetic forming tool head as the forming die. Step A2: First, start the first driving mechanism to move the first electromagnetic forming tool head radially to the set distance d 外 ; then, start the second driving mechanism to move the second electromagnetic forming tool head radially to the set distance d 内 ; and perform electromagnetic forming on the tube blank Step A3: Repeat Step A1 and Step A2 until the position positioning of all n groups of electromagnetic forming units is completed.

8. A method for electromagnetic forming of a reducing pipe according to claim 7, characterized in that In the step A3, repeat Step A1 and Step A2, and control the n groups of electromagnetic forming units to perform position positioning from bottom to top in sequence.

9. A method for electromagnetic forming of a reducer, characterized in that, according to claim 5, The step S2 includes the following steps: Step B1: Use the first electromagnetic forming tool head or the second electromagnetic forming tool head as the forming die. Step B2: First, control all the first electromagnetic forming tool heads of the n groups of electromagnetic forming units to move radially to the set distance d 外 ; then, control all the second electromagnetic forming tool heads of the n groups of electromagnetic forming units to move radially to the set distance d 内 .

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