Method and device for simultaneously forming plate and pipe based on cross-shaped magnetic collector

Abstract

The invention relates to a method for simultaneously forming a plate and a pipe based on a cross-shaped magnetic collector, which comprises the following steps of: manufacturing the cross-shaped magnetic collector with a coil accommodating cavity, and placing a driving coil in the coil accommodating cavity; workpieces to be formed are arranged and fixed on the upper side, the lower side, the inner side and the outer side of the magnetic collector respectively; connecting the driving coil to a pulse power supply through a discharge switch; and the discharge switch is controlled to supply power to the driving coil, and induced eddy current is generated in the to-be-formed pipe fitting and the to-be-formed plate to enable the pipe fitting and the plate to deform, so that the forming specification is achieved. The invention further discloses a device for simultaneously forming the plate and the pipe. According to the invention, simultaneous forming of pipe fitting bulging, pipe fitting compression and plate fitting bulging is realized, the workpiece forming efficiency is multiplied, electromagnetic radiation to the environment in the workpiece electromagnetic forming process is reduced, and the device is more energy-saving and environment-friendly.

Description

Technical Field

[0001] The invention belongs to the field of metal workpiece forming control, and in particular relates to a method and device for simultaneously forming a plate and a pipe based on a cross-shaped magnetic concentrator. Background Art

[0002] Lightweighting is an important technological approach to achieving energy conservation and emission reduction in sectors such as aerospace and automotive. Electromagnetic forming, a high-rate pulse forming technology, can significantly improve the forming properties of metal materials and is an effective means of addressing the difficulties faced in forming lightweight alloys.

[0003] During the electromagnetic forming process, the energy initially input by the power supply undergoes a transformation. This energy acts on the workpiece, causing it to deform, converting electrical energy into shaping energy. The primary energy loss in the electromagnetic forming process is Joule heat generated by the coil heating. Studies have found that only a portion of the electrical energy stored in the charging capacitor, which serves as a pulse power source, is converted into workpiece forming energy. The ratio of workpiece shaping energy to the electrical energy in the charging capacitor does not exceed 20%. Currently, very little research has examined the energy consumption of electromagnetic forming.

[0004] The paper "Study on the efficiency of SimultaneousTube Compression and Expansion Electromagnetic Forming" published in the journal "IEEE ACCESS" discloses a method for electromagnetic forming of dual tubes. It can provide electromagnetic force to two tubes at the same time, and respectively produce compression and expansion forming effects, and the forming efficiency is greatly improved compared to traditional expansion. This method cannot achieve the simultaneous forming of tubes and plates. The Chinese patent "A High-efficiency Plate Electromagnetic Forming Method and Device" with publication number CN105880348B provides a high-efficiency plate electromagnetic forming method, which connects the metal plates to be processed end to end to form a polygonal conductive loop, realizing the simultaneous processing of multiple metal plates and improving the efficiency of electromagnetic forming. However, this method can only achieve the simultaneous forming of multiple plates, and cannot achieve the simultaneous forming of tubes and plates.

[0005] In summary, the prior art lacks an electromagnetic forming method and device for simultaneously forming pipes and plates. Summary of the Invention

[0006] The purpose of the present invention is to address the above problems and provide a method and device for simultaneous forming of plates and tubes based on a cross-shaped magnetic collector, wherein the magnetic collector has an outer protrusion, an inner protrusion, an upper protrusion and a lower protrusion, the tube to be expanded is placed on the outside of the cross-shaped magnetic collector, the tube to be compressed is placed in the hollow inside the cross-shaped magnetic collector, and the plate to be expanded is placed at the upper and lower ends of the cross-shaped magnetic collector. The outer protrusion of the cross-shaped magnetic collector increases the radial electromagnetic force of the tube outside the cross-shaped magnetic collector, the inner protrusion of the cross-shaped magnetic collector increases the radial electromagnetic force of the tube inside the cross-shaped magnetic collector, the upper protrusion of the cross-shaped magnetic collector increases the axial electromagnetic force of the upper end plate of the cross-shaped magnetic collector, and the lower protrusion of the cross-shaped magnetic collector increases the axial electromagnetic force of the lower end plate of the cross-shaped magnetic collector, thereby realizing the simultaneous forming of tube expansion, tube compression and double plate expansion, and improving the workpiece forming efficiency and power utilization rate.

[0007] The technical solution of the present invention is a method for simultaneously forming a plate and a tube based on a cross-shaped magnetic concentrator, comprising the following steps: Step 1: Make a cross-shaped magnetic concentrator with a coil cavity, and place the driving coil in the coil cavity; Step 2: Arrange and fix the pipe and plate to be formed on the upper, lower, inner and outer sides of the cross-shaped magnetic collector; Step 2.1: Place the pipe to be formed inside and outside the cross-shaped magnetic collector and fix it; Step 2.2: Place the plate to be formed on the upper and lower sides of the cross-shaped magnetic collector and fix them; Step 3: Connect the driving coil to the pulse power supply via the discharge switch; Step 4: Control the discharge switch to power the drive coil, generate induced eddy currents in the pipe or plate to be formed, and deform the pipe or plate to meet the forming specifications; Step 5: Determine whether the pipes and plates to be formed meet the forming specifications. If there are pipes or plates that do not meet the forming specifications, remove the pipes and plates that meet the forming specifications, and repeat steps 3 and 4 for the pipes or plates that do not meet the forming specifications until they meet the forming specifications.

[0008] Preferably, the cross-shaped magnetic flux collector is divided into upper and lower parts to facilitate placement or removal of the driving coil.

[0009] Preferably, the distance between the inner wall of the tube to be formed and the outer wall of the cross-shaped magnetic collector is no more than 1.5 mm.

[0010] Preferably, the distance between the outer wall of the tube to be formed and the inner wall of the cross-shaped magnetic collector is no more than 1.5 mm.

[0011] Preferably, the distance between the plate to be formed and the top end of the cross-shaped magnetic collector is no more than 1 mm.

[0012] Preferably, the distance between the plate to be formed and the bottom end of the cross-shaped magnetic collector is no more than 1 mm.

[0013] Preferably, the discharge pulse width of the pulse power supply is 50 μs-1 ms.

[0014] A device for simultaneously forming plates and pipes includes a cross-shaped magnetic collector, a driving coil and a pulse power supply. The cross-shaped magnetic collector includes an outer convex ring, an inner convex ring, an upper convex ring and a lower convex ring. The cross-shaped magnetic collector is provided with a coil cavity and a through hole for placing the pipe to be formed. The side wall of the cross-shaped magnetic collector is provided with a slit. The cross-section of the cross-shaped magnetic collector is cross-shaped. The driving coil is placed in the coil cavity. The driving coil is connected to the pulse power supply via a discharge switch.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1) The method for simultaneous forming of plates and tubes of the present invention realizes the simultaneous forming of tube expansion, tube compression and plate expansion, which exponentially improves the forming efficiency of the workpiece and reduces the electromagnetic radiation to the environment during the electromagnetic forming process of the workpiece, making it more energy-saving and environmentally friendly.

[0016] 2) The present invention realizes the simultaneous forming control of two plates and two pipes, and enables the two formed plates to achieve different forming specifications, which can meet diverse plate forming requirements.

[0017] 3) The cross-shaped magnetic flux collector of the present invention is easy to manufacture and has low cost, and is conducive to large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and examples.

[0019] Figure 1 Schematic cross-sectional view of a cross-shaped magnetic flux collector according to an embodiment of the present invention.

[0020] Figure 2 Schematic diagram of circuit connections of a device for simultaneously forming plates and tubes according to an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of a device for simultaneously forming plates and tubes according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The cross-shaped magnetic collector of the embodiment is as follows Figure 1As shown, the cross-shaped magnetism collector 2 is in the shape of a circular ring, and includes an outer convex ring 2.1, an inner convex ring 2.2, an upper convex ring 2.3 and a lower convex ring 2.4. The cross-shaped magnetism collector 2 is provided with a coil cavity 2.5 and a through hole 2.6 for placing the pipe to be formed. The side wall of the cross-shaped magnetism collector 2 is provided with a slit 2.7. The upper convex ring of the cross-shaped magnetism collector 2 is used to increase the axial electromagnetic force of the upper end plate of the cross-shaped magnetism collector, the lower convex ring of the cross-shaped magnetism collector 2 is used to increase the axial electromagnetic force of the lower end plate of the cross-shaped magnetism collector, the outer convex ring of the cross-shaped magnetism collector 2 is used to increase the radial electromagnetic force of the outer pipe of the cross-shaped magnetism collector, and the inner convex ring of the cross-shaped magnetism collector 2 is used to increase the radial electromagnetic force of the inner pipe of the cross-shaped magnetism collector. As shown Figure 1 As shown, the cross-shaped magnetic collector 2 is divided into upper and lower parts to facilitate the placement or removal of the driving coil.

[0023] The method for simultaneously forming plates and tubes based on a cross-shaped magnetic concentrator comprises the following steps: Step 1: Make a cross-shaped magnetic concentrator with a coil cavity, and place the driving coil in the coil cavity; Step 2: Arrange and fix the workpiece to be formed on the upper, lower, inner and outer sides of the magnetic collector respectively; Step 2.1: Place the pipe to be formed inside and outside the magnetic collector and fix it; Step 2.2: Place the plate to be formed on the upper and lower sides of the magnetic collector, and fix the edges of the plate to be formed with a blank holder; Step 3: Connect the drive coil to the pulse power supply via the discharge switch, as shown in Figure 2 As shown; Step 4: Control the discharge switch to power the drive coil, generate induced eddy currents in the pipe or plate to be formed, and deform the pipe or plate; Step 5: Determine whether the pipes and plates to be formed meet the forming specifications. If there are workpieces to be formed that do not meet the forming specifications, remove the workpieces that meet the forming specifications and repeat steps 3 and 4 for the workpieces that do not meet the forming specifications until they meet the forming specifications.

[0024] In the embodiment, the discharge pulse width of the pulse power supply is 50 μs-1 ms.

[0025] like Figure 3 As shown, the plate and tube forming device comprises a cross-shaped magnetic collector 2, a driving coil 1 and a pulse power supply. The cross-shaped magnetic collector comprises an outer convex ring 2.1, an inner convex ring 2.2, an upper convex ring 2.3 and a lower convex ring 2.4. The cross-shaped magnetic collector is provided with a coil cavity 2.5 and a through hole 2.6 for placing the tube to be formed. The side wall of the cross-shaped magnetic collector is provided with a slit 2.7. The cross-shaped magnetic collector has a cross-shaped cross section. The driving coil 1 is placed in the coil cavity 2.5. The driving coil 1 is connected to the pulse power supply via a discharge switch. Figure 2 shown.

[0026] In the embodiment, the first plate member 5 to be formed and the second plate member 6 to be formed are expanded into basin-shaped members.

[0027] In the embodiment, two pipes and two plates are processed and formed simultaneously.

Claims

1. A method for simultaneously forming plates and tubes based on a cross-shaped magnetic collector, characterized in that: The following steps are involved: Step 1: Make a cross-shaped magnetic collector with a coil cavity, and place a driving coil in the coil cavity; Step 2: Arrange and fix the pipe and plate to be formed on the upper, lower, inner and outer sides of the cross-shaped magnetic collector; Step 2.1: The pipe to be formed is arranged inside and outside the cross-shaped magnetic collector and fixed; Step 2.2: The plate to be formed is arranged on the upper and lower sides of the cross-shaped magnetic collector and fixed; Step 3: Connect the driving coil to the pulse power supply via the discharge switch; Step 4: Control the discharge switch to power the drive coil, generate induced eddy currents in the pipe or plate to be formed, and deform the pipe or plate to meet the forming specifications; Step 5: Determine whether the pipes and plates to be formed meet the forming specifications. If there are pipes or plates that do not meet the forming specifications, remove the pipes and plates that meet the forming specifications, and repeat steps 3 and 4 for the pipes or plates that do not meet the forming specifications to make them meet the forming specifications.

2. The method for simultaneously forming plates and tubes based on a cross-shaped magnetic concentrator according to claim 1, characterized in that: The cross-shaped magnetic collector is divided into upper and lower parts to facilitate the placement or removal of the drive coil.

3. The method for simultaneously forming plates and tubes based on a cross-shaped magnetic concentrator according to claim 2, characterized in that: The distance between the pipe to be formed and the outer wall or inner wall of the cross-shaped magnetic collector is not greater than 1.5 mm.

4. The method for simultaneously forming plates and tubes based on a cross-shaped magnetic concentrator according to claim 2 or 3, characterized in that: The distance between the plate to be formed and the top or bottom of the cross-shaped magnetic collector is no more than 1 mm.

5. The method for simultaneously forming plates and tubes based on a cross-shaped magnetic concentrator according to claim 4, characterized in that: The discharge pulse width of the pulse power supply is 50μs-1ms.

6. The device for simultaneously forming plates and tubes according to the method of claim 1, 2, 3 or 5, characterized in that: The invention comprises a cross-shaped magnetism collector (2), a driving coil (1) and a pulse power supply, wherein the cross-shaped magnetism collector comprises an outer convex ring (2.1), an inner convex ring (2.2), an upper convex ring (2.3) and a lower convex ring (2.4), the cross-shaped magnetism collector is provided with a coil cavity (2.5) and a through hole (2.6) for placing a pipe to be formed, the side wall of the cross-shaped magnetism collector is provided with a slit (2.7), the cross-shaped magnetism collector has a cross-shaped cross section, the driving coil (1) is placed in the coil cavity (2.5), and the driving coil (1) is connected to the pulse power supply via a discharge switch.

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