CN114769408A - Electromagnetic bulging method and device for pipe fitting with magnetic collector with inner wall and outer wall loaded in two directions - Google Patents
Electromagnetic bulging method and device for pipe fitting with magnetic collector with inner wall and outer wall loaded in two directions Download PDFInfo
- Publication number
- CN114769408A CN114769408A CN202210422853.9A CN202210422853A CN114769408A CN 114769408 A CN114769408 A CN 114769408A CN 202210422853 A CN202210422853 A CN 202210422853A CN 114769408 A CN114769408 A CN 114769408A
- Authority
- CN
- China
- Prior art keywords
- bulging
- pipe fitting
- magnetic collector
- wall
- collector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000000694 effects Effects 0.000 claims abstract description 11
- 230000009467 reduction Effects 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000004088 simulation Methods 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 3
- 230000004323 axial length Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 8
- 230000002457 bidirectional effect Effects 0.000 abstract description 7
- 230000005389 magnetism Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003433 contraceptive agent Substances 0.000 description 2
- 230000002254 contraceptive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/14—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces applying magnetic forces
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a pipe fitting electromagnetic bulging method for bidirectional loading of the inner wall and the outer wall of a magnetic collector, which comprises the following steps: determining bulging coil parameters according to the forming specification requirements of the bulging pipe fitting; determining parameters of the novel magnetic collector according to the forming specification of the pipe fitting and the parameters of the bulging coil, and manufacturing the magnetic collector; placing the bulging coil, the novel magnetic collector and the pipe fitting to be bulged on the bulging base from inside to outside, aligning with the center of the bulging base and fixing; connecting the bulging coil to a pulse power supply, electrifying the bulging coil, controlling the discharge time of the pulse power supply, and performing electromagnetic bulging on the pipe fitting to be bulged; and judging whether the bulging effect of the pipe fitting meets the forming specification of the pipe fitting or not, if so, finishing, and otherwise, performing electromagnetic bulging on the pipe fitting again. The bulging method of the invention utilizes the mode of bidirectional loading of the inner wall and the outer wall of the annular magnetic collector, improves the axial uniformity of the bulging of the pipe fitting, and effectively inhibits the wall thickness reduction in the bulging process of the pipe fitting.
Description
Technical Field
The invention belongs to the field of forming control of aviation pipe fittings, and particularly relates to a pipe fitting electromagnetic bulging method and device with a magnetic collector loaded on the inner wall and the outer wall in a bidirectional mode.
Background
Technological innovations in electromagnetic forming are often marked by the creation of more reasonable electromagnetic force distributions for the new drive coil configurations.
The existing pipe fitting bulging system consists of a charging system, a discharging capacitor, a switch, a driving coil and a pipe fitting. The charging system firstly charges the capacitor, then the switch is switched on, the energy stored by the capacitor is transferred to the driving coil in the form of pulse current, and the electromagnetic force for driving the pipe fitting to expand is generated after the magnetic field generated by the coil and the induced eddy current generated on the pipe fitting are superposed. However, the presently used drive coil loading systems result in the tubular bulging as a non-uniform convex profile and the tubular wall thickness reduction is large.
The invention patent with publication number CN103406418B, a method and an apparatus for electromagnetic forming of a metal pipe fitting with loading in both radial and axial directions, provides a method and an apparatus for electromagnetic forming of a metal pipe fitting with loading in both radial and axial directions, which mainly comprises an eddy current coil generating induced eddy current, a magnetic field coil generating radial magnetic field, and a power supply system supplying power to the eddy current coil and the magnetic field coil. Meanwhile, the invention also provides a radial and axial bidirectional loading type metal pipe fitting electromagnetic forming method, which can provide high-speed deformation experimental conditions under different loading forms for the metal pipe fitting and provide a new experimental means for the research of the high-speed deformation mechanism of the material. However, this patent can provide bidirectional electromagnetic force loading for the pipe, but the number of coils is large, the tooling is complex, and the economic benefit is not high enough.
The invention patent with publication number CN110210116A 'a two-dimensional axisymmetric simulation model and modeling method suitable for electromagnetic forming of a pipe with a magnetic collector' provides a two-dimensional axisymmetric simulation model and modeling method suitable for electromagnetic forming of a pipe with a magnetic collector, and compared with the existing three-dimensional model, the simulation model and method provided by the invention have higher calculation speed; compared with the existing two-dimensional axisymmetric model, the simulation model and the method provided by the invention are more fit with physical reality and have higher calculation precision. However, this patent does not design a magnetic field transducer suitable for bi-directional electromagnetic force loading of the tubular.
Disclosure of Invention
The invention aims to solve the technical problem that the radial electromagnetic force provided by the bulging coil of the existing pipe fitting bulging method is far larger than the axial electromagnetic force, so that the wall thickness of the pipe fitting after bulging is reduced. The radial electromagnetic force is not uniformly distributed along the axial direction of the pipe fitting, so that the pipe fitting presents a convex shape which is not uniform in the axial direction after being expanded.
The invention aims to solve the problems and provides a pipe fitting electromagnetic bulging method and device with a magnetic collector loaded on the inner wall and the outer wall in two directions. The radial electromagnetic resultant force of the middle part of the pipe fitting to be expanded outside the magnetic collector is reduced by utilizing the induced eddy current which is generated by the inner wall of the annular magnetic collector and has the direction opposite to the direction of the outer wall of the magnetic collector, so that the forming axial uniformity of the pipe fitting is better; the magnetic collector with the longitudinal length larger than that of the pipe fitting to be expanded is adopted, the ratio of the axial electromagnetic force and the radial electromagnetic force applied to the pipe fitting is increased, the pipe fitting material is enabled to flow axially, and the phenomenon of wall thickness reduction during the expansion of the pipe fitting is inhibited.
The electromagnetic bulging method for the pipe fitting comprises the following steps:
step 1: determining the shape and parameters of a magnetic collector according to the forming specification requirement of the pipe fitting to be expanded;
and 2, step: manufacturing a magnetic collector according to the shape and parameters of the magnetic collector obtained in the step 1;
and step 3: placing the bulging coil, the novel magnetic collector and the pipe fitting to be bulged on the bulging base from inside to outside, and aligning and fixing the central axes of the bulging coil, the novel magnetic collector and the pipe fitting to be bulged with the central line of the bulging base;
and 4, step 4: connecting the bulging coil to a pulse power supply, electrifying the bulging coil, controlling the discharge time of the pulse power supply, and performing electromagnetic bulging on the pipe fitting to be bulged;
and 5: and (4) judging whether the bulging effect of the pipe fitting meets the forming specification of the pipe fitting or not, if so, finishing, and otherwise, executing the step (4) to perform electromagnetic bulging on the pipe fitting again.
Preferably, in step 1, a workpiece electromagnetic forming model including a magnetic collector, a driving coil and a pipe to be formed is established by using finite element software, pulse current is applied to the driving coil of the workpiece electromagnetic forming model, the bulging effect of the pipe is obtained through simulation, the shape and parameters of the magnetic collector are adjusted, a simulation experiment is repeated to enable the axial uniformity of the pipe to be the best and the wall thickness reduction amount of the pipe to be the minimum, and the shape and parameters of the magnetic collector are determined through simulation.
Preferably, the difference between the inner diameter of the pipe to be formed and the outer diameter of the magnetic collector is not more than 12 mm.
Further, the axial length of the magnetic collector is larger than that of the pipe fitting to be formed.
Preferably, the difference between the inner diameter of the magnetic collector and the outer diameter of the expansion coil is not more than 2 mm.
Preferably, in the step 4, the discharge pulse width of the pulse power supply is 50-1000 us.
Preferably, the radial distance between the inner wall of the magnetic collector and the outer layer of the bulging coil is 2 mm.
Preferably, the radial distance between the outer wall of the magnetic collector and the inner wall of the pipe fitting to be expanded is 2 mm.
The inner wall of the stepped magnetic collector is stepped, the outer wall of the stepped magnetic collector is provided with a groove, and the ratio of the width of the groove to the height of the outer wall of the stepped magnetic collector is 0.7-0.9.
Protruding type dicyclo magnetic collector, including fitting with a contraceptive ring and lower ring, it all includes outer arch to fit with a contraceptive ring, lower ring. The distance between the lower ring and the upper ring is 6 mm.
The ladder-shaped double-ring magnetic collector comprises an upper ring and a lower ring, wherein the inner walls of the upper ring and the lower ring are in ladder shapes.
Compared with the prior art, the invention has the beneficial effects that:
1) the bulging method disclosed by the invention has the advantages that the novel magnetic collector and the bulging coil are matched to carry out bidirectional electromagnetic force loading on the bulging pipe fitting, so that the axial uniformity of the bulging of the pipe fitting is improved, and the wall thickness reduction in the bulging process of the pipe fitting is effectively inhibited;
2) the invention adopts the inner and outer wall structures with different parameter designs to realize the electromagnetic force loading with different ratios of radial electromagnetic force to axial electromagnetic force, and can meet the requirements of different pipe fitting forming specifications;
3) the service life of the driving coil is prolonged, the magnetic collector bears the electromagnetic force action of the pipe fitting and the driving coil in the pipe fitting bulging process, and the electromagnetic force action borne by the driving coil is greatly reduced, so that the service life of the driving coil is prolonged.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic view of a pipe expansion apparatus according to the first embodiment.
Fig. 2 is a schematic view of the distribution of induced current of the magnetic collector according to the first embodiment when the pipe is expanded.
FIG. 3 is a schematic diagram illustrating the radial and axial electromagnetic forces experienced by the pipe during the pipe expansion process according to one embodiment.
Fig. 4 is a schematic view of the pipe expansion apparatus of the second embodiment.
Fig. 5 is a schematic view of the induced current distribution of the magnetic collector of the second embodiment when the pipe is expanded.
Fig. 6 is a schematic view of radial and axial electromagnetic forces applied to the pipe in the pipe bulging process according to the second embodiment.
Fig. 7 is a schematic view of the pipe expanding device of the third embodiment.
Fig. 8 is a schematic diagram of the distribution of induced currents of the magnetic collector of the third embodiment when the pipe fitting is expanded.
Fig. 9 is a schematic view of radial and axial electromagnetic forces applied to the pipe in the pipe bulging process according to the third embodiment.
Detailed Description
Example one
As shown in fig. 2, in the embodiment, the induced eddy current generated by the inner wall of the annular magnetic collector and having a direction opposite to that of the outer wall of the magnetic collector is used to reduce the radial electromagnetic resultant force in the middle of the pipe to be expanded outside the magnetic collector, so that the axial uniformity of the pipe forming is better. The magnetic collector of the embodiment adopts a ladder-shaped magnetic collector 1.
The electromagnetic bulging method for the pipe fitting comprises the following steps:
step 1: establishing a workpiece electromagnetic forming model comprising a magnetic collector, a driving coil and a pipe fitting to be formed by using finite element software, applying pulse current to the driving coil of the workpiece electromagnetic forming model, simulating to obtain the bulging effect of the pipe fitting, adjusting the shape and the parameters of the magnetic collector, repeatedly performing a simulation experiment to ensure that the axial uniformity of the pipe fitting is best and the wall thickness reduction of the pipe fitting is minimum, and simulating to determine the shape and the parameters of the magnetic collector;
step 2: determining parameters of a magnetic collector according to the forming specification of the pipe fitting and the parameters of the bulging coil, and manufacturing the magnetic collector;
and step 3: placing the bulging coil, the magnetic collector and the pipe fitting to be bulged on a bulging base from inside to outside, aligning and fixing the central axes of the bulging coil, the magnetic collector and the pipe fitting to be bulged with the center of the bulging base, placing a top cover above the magnetic collector and the pipe fitting to be bulged, and pressing the top cover by using a hydraulic press;
and 4, step 4: connecting the bulging coil to a pulse power supply, electrifying the bulging coil, controlling the discharge time of the pulse power supply, and performing electromagnetic bulging on the pipe fitting to be bulged;
and 5: and (4) judging whether the bulging effect of the pipe fitting meets the forming specification of the pipe fitting or not, if so, finishing, and otherwise, executing the step (4) to perform electromagnetic bulging on the pipe fitting again.
In the step 4, the discharge pulse width of the pulse power supply is 50-1000 us.
As shown in fig. 1-3, the pipe fitting bulging device of the embodiment includes a bulging base 4, a bulging coil 2, a step-shaped magnetic collector 1, a top cover 5 and a pulse power supply 6, the bulging base 4 is provided with an annular bulging area 401, the bulging coil 2, the step-shaped magnetic collector 1 and a pipe fitting 3 to be bulged are placed in the annular bulging area 401 of the bulging base from inside to outside, central axes of the bulging coil 2 and the step-shaped magnetic collector 1 are aligned with a central line of the bulging base 4, and the bulging coil 2 is electrically connected with the pulse power supply 6. The top cover 5 is used for pressing the pipe fitting 3 to be expanded and fixing the step-shaped magnetism collector 1.
The length of the pipe to be expanded 3 of the embodiment is 80 mm.
The inner wall 102 of the step-shaped magnetism collector is step-shaped, the outer wall 101 of the step-shaped magnetism collector is provided with a groove 103, and the ratio of the width of the groove 103 to the height of the outer wall 101 of the step-shaped magnetism collector ranges from 0.7 to 0.9. In the invention, when the pipe fitting bulging uniformity is optimal, the height of the outer wall of the stepped magnetic collector is 84mm, and the width range of the groove is 75.6 mm.
The height of the inner wall of the magnetic collector of the embodiment is smaller than that of the outer wall of the magnetic collector, and the currents at the outer wall and the inner wall of the magnetic collector are equal in magnitude and opposite in direction; the current density of the outer wall of the magnetic collector is larger than that of the inner wall of the magnetic collector. Induced current on the outer wall of the magnetic collector generates radial electromagnetic force to drive the pipe fitting to expand; the induced current at the inner wall of the magnetic collector generates reverse radial electromagnetic force to inhibit the bulging of the pipe fitting, and the radial electromagnetic force for inhibiting the bulging of the pipe fitting is concentrated in the middle of the pipe fitting, so that the radial electromagnetic force applied to the middle of the pipe fitting is weakened, and the radial electromagnetic force is uniformly distributed along the axial direction of the pipe fitting, as shown in fig. 3. The groove of the outer wall of the magnetic collector can weaken the electromagnetic force of the inner wall area of the pipe fitting, and the height of the outer wall of the magnetic collector is larger than that of the pipe fitting, so that the generated axial electromagnetic force promotes the axial flow of pipe fitting materials, and the excessive thinning of the wall thickness of the pipe fitting in the pipe fitting bulging process is avoided.
Example two
As shown in fig. 4, the magnetic collector of the embodiment adopts a convex double-ring magnetic collector 1, which comprises an upper ring 1a and a lower ring 1b, wherein the outer wall 101 of the upper ring 1a has an outer protrusion, the inner wall of the upper ring 1a is axially flat, and the lower ring 1b has the same structure as the upper ring 1 a. The upper ring 1a and the lower ring 1b are spaced 6mm apart.
The method of tube bulging in the example is the same as in the first example.
As shown in fig. 4-6, the pipe expanding device of the embodiment includes an expanding base 4, an expanding coil 2, a convex double-ring magnetic collector 1, a top cover 5 and a pulse power supply 6, the expanding base 4 is provided with an annular expanding region 401, the expanding coil 2, the convex double-ring magnetic collector 1 and the pipe to be expanded 3 are placed in the annular expanding region 401 of the expanding base from inside to outside, the central axes of the expanding coil 2 and the convex double-ring magnetic collector 1 are aligned with the central axis of the expanding base 4, and the expanding coil 2 is electrically connected with the pulse power supply 6. The top cover 5 presses the pipe 3 to be expanded. The upper ring 1a of the externally convex double-ring magnetic collector 1 is fixedly connected with the top cover 5.
Symmetrical step-type magnetic collectors in the magnetic collector of the embodiment are positioned at two ends of the pipe fitting, the height of the inner wall of the magnetic collector is greater than that of the outer wall of the pipe fitting, currents at the outer wall and the inner wall of the magnetic collector are equal in magnitude and opposite in direction. Because the current direction of the inner wall of the magnetic collector is opposite to the current direction of the coil, the current direction of the outer wall of the magnetic collector is the same as the current direction of the coil, the direction of the electromagnetic force applied to the pipe fitting is changed from the middle part of the pipe fitting to the end part of the pipe fitting, and the radial electromagnetic force applied to the middle part of the pipe fitting is weakened. Because the pipe fitting has the end effect in the bulging process, the symmetrical magnetic collectors can effectively inhibit the end effect, and the radial electromagnetic force is uniformly distributed along the axial direction of the pipe fitting. The magnetism collector outer wall inlays in the top cap, and the subregion that exceeds the pipe fitting can provide the axial electromagnetic force, effectively restraines the pipe fitting wall thickness attenuate.
The convex double-ring magnetic collector can enhance the radial electromagnetic force of the end part of the pipe fitting, greatly enhances the bulging uniformity of the pipe fitting, and the end part of the magnetic collector can effectively inhibit the wall thickness reduction of the pipe fitting. The introduction of the magnetic collector protects the drive coil, and prolongs the service life of the drive coil and the drive coil.
EXAMPLE III
As shown in fig. 7, the magnetic concentrator of the embodiment adopts a ladder-shaped dual-ring magnetic concentrator, which includes an upper ring 1A and a lower ring 1B, the outer wall 101 of the upper ring 1A has an outer protrusion, the inner wall of the upper ring 1B is ladder-shaped, and the lower ring 1B has the same structure as the upper ring 1A. The upper ring 1A and the lower ring 1B are spaced apart by 6 mm.
The pipe bulging method of the embodiment is the same as that of the first embodiment.
As shown in fig. 7-9, the pipe fitting bulging device of the embodiment includes a bulging base 4, a bulging coil 2, a stepped double-ring magnetic collector 1, a top cover 5 and a pulse power supply 6, the bulging base 4 is provided with an annular bulging region 401, the bulging coil 2, the stepped double-ring magnetic collector 1 and a pipe fitting 3 to be bulged are placed in the annular bulging region 401 of the bulging base from inside to outside, central axes of the bulging coil 2 and the convex double-ring magnetic collector 1 are aligned with a central line of the bulging base 4, and the bulging coil 2 is electrically connected with the pulse power supply 6. The top cover 5 compresses the pipe 3 to be expanded. The upper ring 1A of the ladder-shaped double-ring magnetic collector 1 is fixedly connected with the top cover 5.
Symmetrical step-shaped double-ring magnetic collectors in the magnetic collector of the embodiment are positioned at two ends of the pipe fitting, and the currents at the outer wall and the inner wall of the magnetic collector are equal in magnitude and opposite in direction. The current direction of the outer wall of the magnetic collector is the same as that of the coil, so that the direction of the electromagnetic force applied to the pipe fitting is changed from the middle part of the pipe fitting to the end part of the pipe fitting, and the radial electromagnetic force applied to the middle part of the pipe fitting is weakened. The outward convex shape of the outer wall of the magnetic collector can effectively inhibit the end effect of electromagnetic bulging of the pipe fitting, so that the radial electromagnetic force is uniformly distributed along the axial direction of the pipe fitting. The magnetism collector outer wall inlays in the top cap, and the subregion that exceeds the pipe fitting can provide the axial electromagnetic force, effectively restraines the pipe fitting wall thickness attenuate.
The ladder-shaped double-ring magnetic collector can enable the electromagnetic force of the pipe fitting to be more concentrated at the end part, the outward convex shape of the outer wall of the magnetic collector can enable the electromagnetic force to be more concentrated, the generation of an end effect in the electromagnetic bulging of the pipe fitting can be effectively inhibited, and the end part of the magnetic collector can effectively inhibit the wall thickness from being thinned.
Claims (10)
1. The electromagnetic bulging method of the pipe fitting with the inner wall and the outer wall loaded bidirectionally of the magnetic collector is characterized in that the radial electromagnetic resultant force in the middle of the pipe fitting to be bulged outside the magnetic collector is reduced by utilizing the induced eddy current which is generated by the inner wall of the annular magnetic collector and has the direction opposite to the direction of the outer wall of the magnetic collector, so that the axial uniformity of the pipe fitting is better;
the method comprises the following steps:
step 1: determining the shape and parameters of a magnetic collector according to the forming specification requirement of the pipe fitting to be expanded;
and 2, step: manufacturing a magnetic collector according to the shape and parameters of the magnetic collector obtained in the step 1;
and step 3: placing the bulging coil, the novel magnetic collector and the pipe fitting to be bulged on the bulging base from inside to outside, and aligning and fixing the central axes of the bulging coil, the novel magnetic collector and the pipe fitting to be bulged with the central line of the bulging base;
and 4, step 4: connecting the bulging coil to a pulse power supply, electrifying the bulging coil, controlling the discharge time of the pulse power supply, and performing electromagnetic bulging on the pipe fitting to be bulged;
and 5: and (4) judging whether the bulging effect of the pipe fitting meets the forming specification of the pipe fitting or not, if so, finishing, and otherwise, executing the step (4) to carry out electromagnetic bulging on the pipe fitting again.
2. The electromagnetic bulging method for the pipe fitting according to claim 1, wherein in the step 1, a workpiece electromagnetic forming model comprising a magnetic collector, a driving coil and the pipe fitting to be formed is established by using finite element software, pulse current is applied to the driving coil of the workpiece electromagnetic forming model, the bulging effect of the pipe fitting is obtained through simulation, the shape and the parameters of the magnetic collector are adjusted, a simulation experiment is repeated to ensure that the axial uniformity of the pipe fitting is the best, the wall thickness reduction amount of the pipe fitting is the minimum, and the shape and the parameters of the magnetic collector are determined through simulation.
3. A method of electromagnetic pipe bulging according to claim 2, characterised in that the difference between the inner diameter of the pipe to be formed and the outer diameter of the magnetic collector is not more than 12 mm.
4. A method of electromagnetic pipe bulging according to claim 2, characterized in that the axial length of said magnetic collector is greater than the length of the pipe to be formed.
5. A method of electromagnetic pipe bulging according to claim 2, wherein the difference between the inner diameter of the magnetic collector and the outer diameter of the bulging coil is not more than 2 mm.
6. The pipe fitting bulging device according to any one of claims 1-5, characterized by comprising a magnetic collector (1), a bulging coil (2), a bulging base (4), a top cover (5) and a pulse power supply (6), wherein the bulging coil (2), the magnetic collector (1) and the pipe fitting (3) to be bulged are placed in an annular bulging area (401) of the bulging base from inside to outside, central axes of the bulging coil (2) and the magnetic collector (1) are aligned with a central line of the bulging base (4), and the bulging coil (2) is electrically connected with the pulse power supply (6); the top cover (5) is used for pressing or fixing the pipe fitting (3) to be expanded and the magnetic collector (1).
7. A stepped magnet collector according to any one of claims 1 to 5, wherein the inner wall of the magnet collector is stepped, the outer wall of the magnet collector is provided with a groove, and the ratio of the width of the groove to the height of the outer wall of the stepped magnet collector is 0.7 to 0.9.
8. A double ring concentrator of an outwardly convex type according to any one of claims 1 to 5, wherein said concentrator comprises an upper ring and a lower ring, the outer wall of the upper ring has an outer protrusion, and the structure of the lower ring is the same as that of the upper ring.
9. The outwardly convex double ring concentrator of claim 8, wherein the distance between the lower ring and the upper ring is 6 mm.
10. A stepped dual ring collector according to any one of claims 1 to 5 wherein said collector comprises an upper ring and a lower ring, the inner walls of both the upper and lower rings being stepped, both the upper and lower rings including external protrusions.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410121232.6A CN117943452A (en) | 2022-04-21 | 2022-04-21 | Pipe fitting bulging method and device adopting double-ring magnetic collector |
| CN202210422853.9A CN114769408B (en) | 2022-04-21 | 2022-04-21 | Electromagnetic bulging method and device for pipe fitting with two-way loading of inner wall and outer wall of magnetic collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210422853.9A CN114769408B (en) | 2022-04-21 | 2022-04-21 | Electromagnetic bulging method and device for pipe fitting with two-way loading of inner wall and outer wall of magnetic collector |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410121232.6A Division CN117943452A (en) | 2022-04-21 | 2022-04-21 | Pipe fitting bulging method and device adopting double-ring magnetic collector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114769408A true CN114769408A (en) | 2022-07-22 |
| CN114769408B CN114769408B (en) | 2024-03-12 |
Family
ID=82430302
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410121232.6A Pending CN117943452A (en) | 2022-04-21 | 2022-04-21 | Pipe fitting bulging method and device adopting double-ring magnetic collector |
| CN202210422853.9A Active CN114769408B (en) | 2022-04-21 | 2022-04-21 | Electromagnetic bulging method and device for pipe fitting with two-way loading of inner wall and outer wall of magnetic collector |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410121232.6A Pending CN117943452A (en) | 2022-04-21 | 2022-04-21 | Pipe fitting bulging method and device adopting double-ring magnetic collector |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN117943452A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4619127A (en) * | 1984-02-29 | 1986-10-28 | Agency Of Industrial Science & Technology | Electromagnetic forming method by use of a driver |
| JP2004243353A (en) * | 2003-02-12 | 2004-09-02 | Kobe Steel Ltd | Coil for electromagnetic expanded tube |
| CN101905262A (en) * | 2010-07-29 | 2010-12-08 | 哈尔滨工业大学 | Magnetic concentrator structure for magnetic pulse formation |
| CN102228932A (en) * | 2011-04-22 | 2011-11-02 | 哈尔滨工业大学 | Forming method for improving stepped hollow reducing pipe wall thickness uniformity |
| CN109702072A (en) * | 2018-12-29 | 2019-05-03 | 华中科技大学 | A kind of metalwork electromagnetic attraction forming device |
| CN110193546A (en) * | 2019-06-24 | 2019-09-03 | 华中科技大学 | A kind of device and method of single supply unicoil electromagnetic attraction form metal plate |
-
2022
- 2022-04-21 CN CN202410121232.6A patent/CN117943452A/en active Pending
- 2022-04-21 CN CN202210422853.9A patent/CN114769408B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4619127A (en) * | 1984-02-29 | 1986-10-28 | Agency Of Industrial Science & Technology | Electromagnetic forming method by use of a driver |
| JP2004243353A (en) * | 2003-02-12 | 2004-09-02 | Kobe Steel Ltd | Coil for electromagnetic expanded tube |
| CN101905262A (en) * | 2010-07-29 | 2010-12-08 | 哈尔滨工业大学 | Magnetic concentrator structure for magnetic pulse formation |
| CN102228932A (en) * | 2011-04-22 | 2011-11-02 | 哈尔滨工业大学 | Forming method for improving stepped hollow reducing pipe wall thickness uniformity |
| CN109702072A (en) * | 2018-12-29 | 2019-05-03 | 华中科技大学 | A kind of metalwork electromagnetic attraction forming device |
| CN110193546A (en) * | 2019-06-24 | 2019-09-03 | 华中科技大学 | A kind of device and method of single supply unicoil electromagnetic attraction form metal plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117943452A (en) | 2024-04-30 |
| CN114769408B (en) | 2024-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106270104B (en) | A kind of magnetic field impulse hole flanging formation method of housing component | |
| CN107138591B (en) | Electromagnetic forming device and method for cylindrical part fillet | |
| CN110193546B (en) | Device and method for forming metal plate by single-power-supply single-coil electromagnetic attraction | |
| CN107030172A (en) | A kind of electromagnetic casting method and device based on tubing under background magnetic field | |
| CN107584001B (en) | Electromagnetic forming method and device for metal plate | |
| CN107413916B (en) | A kind of tubing Electromagnetic bulging forming device and method | |
| CN103861933A (en) | Corrugated pipe forming device and corrugated pipe machined through corrugated pipe forming device | |
| CN104985043A (en) | Electromagnetic induction heating bulging apparatus and shaping method for metal conductor pipe | |
| CN109201842B (en) | Electromagnetic pulse compound bulging device and bulging method for three-way pipe | |
| CN107931495B (en) | A kind of cylindrical member it is each to deforming controllable enclosed roll former and method | |
| CN106964684B (en) | A kind of complex multi-step local plastic electromagnetic forming method suitable for sheet material workpiece | |
| CN110000271A (en) | A kind of bellows electromagnetic pulse forming device and method | |
| CN108723164B (en) | Heat transfer plate forming device and forming method | |
| CN112387845A (en) | Large-size pipe fitting electromagnetic flanging device and method based on magnetic collector | |
| CN107413917B (en) | A kind of large-scale metal sheet electromagnetism progressive molding method based on plate face control shape | |
| CN114769408A (en) | Electromagnetic bulging method and device for pipe fitting with magnetic collector with inner wall and outer wall loaded in two directions | |
| CN207577198U (en) | A kind of non-contact flaring of pipe fitting that need not be placed in inside pipe fitting or hemmer | |
| CN107774780B (en) | Pipe fitting non-contact flanging method and device without arranging pipe fitting inside | |
| CN108080482B (en) | A kind of ladder-like cylindrical member producing device and method based on multidirectional magnetic field power drive | |
| CN112439827B (en) | Electromagnetic flanging forming device and method | |
| CN109848279A (en) | A kind of the electromagnetism classification manufacturing process and forming device of heavy parts | |
| CN116078893A (en) | Multi-step electromagnetic driving steel die forming device and forming method | |
| CN214053294U (en) | Large-size pipe fitting electromagnetic flanging device based on magnetism collector | |
| CN103447377B (en) | The Thermal expansion manufacturing process of stainless steel rectangular cross sectional annular part | |
| CN111468586B (en) | Electromagnetic bulging device and method for pipe fitting based on concave coil group |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |