CN110369597B - Opening and closing magnetic collector for pipe electromagnetic pulse forming - Google Patents
Opening and closing magnetic collector for pipe electromagnetic pulse forming Download PDFInfo
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- CN110369597B CN110369597B CN201910774549.9A CN201910774549A CN110369597B CN 110369597 B CN110369597 B CN 110369597B CN 201910774549 A CN201910774549 A CN 201910774549A CN 110369597 B CN110369597 B CN 110369597B
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- 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
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Abstract
The invention discloses an opening and closing magnetic collector for electromagnetic pulse forming of a pipe fitting, wherein two half magnetic collector bodies are divided into an upper structure, a middle structure and a lower structure from top to bottom, and one side of each half magnetic collector body is provided with a first connecting part, a notch and a second connecting part; the third connecting part in one half of the magnetic collector body is inserted into the notch in the other half of the magnetic collector body; the first fixing piece penetrates through a first connecting part and a second connecting part in the first half magnet collector body and a third connecting part in the second half magnet collector body, and the second fixing piece penetrates through the third connecting part in the first half magnet collector body and the first connecting part and the second connecting part in the second half magnet collector body to fixedly splice the two magnet collector bodies; the opening and closing magnetic collector adopts effective internal fixation, can reduce the mechanical damage to the discharge coil and the magnetic collector in the electromagnetic pulse forming process while meeting the requirement of openable working condition, and improves the efficiency of a processing system.
Description
Technical Field
The invention belongs to the field of electromagnetic pulse forming, and relates to an opening and closing magnetism collector for electromagnetic pulse forming of a pipe fitting.
Background
The basic principle of the metal pipe electromagnetic pulse forming technology is that a capacitor group is used for discharging a formed coil, and rapidly changing current flows through the coil to generate a transient strong magnetic field, so that eddy current is formed on the surface of a metal pipe placed in the coil, and deformation is generated under the action of electromagnetic force. In this technique, a magnetic concentrator is also a secondary processing device that is often used.
One typical existing concentrator structure is: the shape is a cylinder; digging two symmetrical truncated cone-shaped concave parts respectively by taking the axis of the cylinder as an axis and taking the two bottom surfaces of the cylinder as lower bottom surfaces; the upper bottom surfaces of the two truncated cone-shaped depressions are connected by a cylindrical through hole, and the diameter of the cross section of the through hole is the same as that of the upper bottom surface of the truncated cone; a cutting slit along the radius direction is arranged at a certain position on the circumference of the magnetic collector, and the closed ring of the magnetic collector is cut off to form a C-shaped unclosed ring body. The radial section of the typical magnetic collector is similar to an isosceles trapezoid, and the working principle is as follows: the eddy current collector is arranged inside a solenoid coil, eddy current is induced on the outer surface of the magnetic collector and flows to the surface of an inner hole through a cutting seam to form a loop, and the axial length of the surface of the inner hole is far smaller than that of the outer wall, so that the current density of the surface of the inner hole is greatly improved, and the magnetic field is correspondingly enhanced. The magnetic collector structure is shown in fig. 1 and 2, and the schematic diagram is shown in fig. 3.
This kind of typical magnetic collector simple structure, it is convenient to make, belongs to the whole magnetic collector that can not split, has certain limitation: the current flow directions on the two sides of the slit are opposite, so that mutually repulsive electromagnetic force exists, and the electromagnetic force near the inner hole is strongest, so that the innermost side of the slit is most prone to deformation and expansion, and the magnetic collector is damaged, as shown in fig. 4. In practical application, the extension part of the inner core which is pressed or welded at two ends of the metal pipe is overlong in length or the diameter of the extension part is larger than the through hole of the magnetic collector, and the machined workpiece cannot be taken out of the magnetic collector.
Patent CN207710080U describes an opening and closing magnetic collector, which is obtained by completely cutting off the above typical magnetic collector along the section of the slit to form two semi-cylindrical magnetic collectors, and when in use, the magnetic collectors are spliced together to achieve a similar processing effect as the typical magnetic collector, and can be opened to take out the workpiece, and the problem of damage to the flared opening of the slit of the magnetic collector is considered to be solved. However, this solution is not practical and does not actually solve the problem of deformation and damage of the magnetic collectors, because there is no reinforced connection design between the two magnetic collectors. When the magnetic collector is used, the two magnetic collectors tend to be separated outwards due to mutual repulsion force, and a mounting gap is generally formed between the magnetic collectors and the coil, so that the magnetic collectors have a space for accelerating movement, and finally the magnetic collectors collide with the coil more violently, damage is transferred to the outer layers of the magnetic collectors and the coil, and further equipment cost loss is caused.
In order to realize the open-close magnetic collector, an effective reinforcement design is indispensable, but if reinforcement is adopted outside the magnetic collector, the reinforcement needs to comprise a connecting mechanism which has high enough strength and can be opened, the thickness of the reinforcement is inevitably large, the distance between the magnetic collector and the coil is increased, the loss of magnetic field energy is caused, and the overall efficiency of the processing system is greatly reduced. Therefore, the magnetic collectors themselves must meet the reinforcement requirements, and new magnetic collectors are designed on the basis of the reinforcement requirements.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the open-close magnetic collector for electromagnetic pulse forming of the pipe fitting, which can relieve the mechanical damage to a discharge coil and the magnetic collector in the electromagnetic pulse forming process, improve the efficiency of a processing system and achieve a better magnetic collection effect.
In order to achieve the purpose, the open-close magnetic collector for electromagnetic pulse forming of the pipe fitting comprises a cylindrical magnetic collector body, wherein the magnetic collector body comprises two half magnetic collector bodies which are buckled with each other;
the two half magnetic collector bodies are divided into an upper structure, a middle structure and a lower structure from top to bottom, a first connecting part, a notch and a second connecting part are arranged on one side of each half magnetic collector body, and a third connecting part is arranged on the other side of each half magnetic collector body, wherein the first connecting part is positioned on the upper structure, the second connecting part is positioned on the lower structure, and the notch and the third connecting part are positioned on the middle structure;
the third connecting part in one half of the magnetic collector body is inserted into the notch in the other half of the magnetic collector body;
the first fixing piece penetrates through a first connecting part and a second connecting part in the first half magnet collector body and a third connecting part in the second half magnet collector body to connect the first half magnet collector body and the second half magnet collector body, and the second fixing piece penetrates through the third connecting part in the first half magnet collector body and the first connecting part and the second connecting part in the second half magnet collector body to connect the first half magnet collector body and the second half magnet collector body;
an insulating layer is arranged between the contact surfaces of the two half magnetic collector bodies;
the middle part of the middle structure is provided with a groove, and the grooves in the two half magnetic collector bodies form a through hole as a cylindrical processing area.
The first fixing piece and the second fixing piece are both bolts or screws, and insulating material layers wrap the outer walls of the first fixing piece and the second fixing piece.
The cross section of the upper structure and the cross section of the lower structure are both right trapezoid structures, and after the two half magnet collector bodies are buckled, the top and the bottom of the magnet collector bodies form a circular truncated cone-shaped groove.
The circular truncated cone-shaped groove at the top of the magnetic collector body is communicated with the circular truncated cone-shaped groove at the bottom of the magnetic collector body through the through hole.
The invention has the following beneficial effects:
the invention relates to an open-close magnetic collector for electromagnetic pulse forming of a pipe fitting, which comprises a cylindrical magnetic collector body, wherein the magnetic collector body comprises two half magnetic collector bodies which are buckled with each other, the two half magnetic collector bodies are divided into an upper structure, a middle structure and a lower structure from top to bottom, a third connecting part in one half magnetic collector body is inserted into a gap in the other half magnetic collector body, a first fixing piece penetrates through a first connecting part and a second connecting part in the first half magnetic collector body and a third connecting part in the second half magnetic collector body to connect the first half magnetic collector body and the second half magnetic collector body, a second fixing piece penetrates through the third connecting part in the first half magnetic collector body and the first connecting part and the second connecting part in the second half magnetic collector body to connect the first half magnetic collector body and the second half magnetic collector body, and energy loss caused by external reinforcement of the magnetic collector is avoided, The whole inefficiency of system of processing and magnetic collection effect are poor, simple structure, convenient operation, the practicality is extremely strong.
Drawings
FIG. 1 is a perspective view of a typical prior art magnetic concentrator;
FIG. 2 is a schematic diagram of the current flow direction of a typical prior art magnetic concentrator machining system;
FIG. 3 is a radial cross-sectional view of the present invention;
FIG. 4 is a schematic view of a half concentrator body according to the present invention;
FIG. 5 is a schematic diagram of the current flow direction of the semi-concentrator body according to the present invention;
FIG. 6 is a schematic view of the present invention;
fig. 7 is a view perpendicular to the axis of the two half magnetic concentrator bodies after being spliced.
Wherein, 1 is the superstructure, 2 is middle part structure, 3 is the substructure, 4 is first connecting portion, 5 is the second connecting portion, 6 is the third connecting portion, 7 is the breach, 8 is the recess, 9 is first mounting, 10 is the second mounting, 11 is the insulating layer, 12 is cylindrical processing district.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 3 to 7, the open-close magnetic concentrator for electromagnetic pulse forming of pipe fittings of the present invention includes a cylindrical magnetic concentrator body, wherein the magnetic concentrator body includes two half magnetic concentrator bodies that are fastened together; the two half magnetic collector bodies are divided into an upper structure 1, a middle structure 2 and a lower structure 3 from top to bottom, a first connecting part 4, a gap 7 and a second connecting part 5 are arranged on one side of each half magnetic collector body, and a third connecting part 6 is arranged on the other side of each half magnetic collector body, wherein the first connecting part 4 is positioned on the upper structure 1, the second connecting part 5 is positioned on the lower structure 3, and the gap 7 and the third connecting part 6 are positioned on the middle structure 2; the third connection part 6 in one half of the concentrator body is inserted into the notch 7 in the other half of the concentrator body; the first fixing piece 9 penetrates through the first connecting part 4 and the second connecting part 5 in the first half magnet collector body and the third connecting part 6 in the second half magnet collector body to connect the first half magnet collector body and the second half magnet collector body, and the second fixing piece 10 penetrates through the third connecting part 6 in the first half magnet collector body and the first connecting part 4 and the second connecting part 5 in the second half magnet collector body to connect the first half magnet collector body and the second half magnet collector body; an insulating layer 11 is arranged between the contact surfaces of the two half magnetic collector bodies; the middle part of the middle structure 2 is provided with a groove 8, and the grooves 8 in the two half magnet collector bodies form a through hole as a cylindrical processing area 12.
Specifically, the first fixing member 9 and the second fixing member 10 are both bolts or screws, and the outer walls of the first fixing member 9 and the second fixing member 10 are wrapped with insulating material layers.
The cross section of the upper structure 1 and the cross section of the lower structure 3 are both right trapezoid structures, and after the two half magnet collector bodies are buckled, the top and the bottom of the magnet collector bodies form a circular truncated cone-shaped groove, wherein the circular truncated cone-shaped groove at the top of the magnet collector body is communicated with the circular truncated cone-shaped groove at the bottom of the magnet collector body through the through hole.
The two semi-magnetic collectors are made of pure copper or copper alloy materials with high strength and conductivity. In addition, the through hole is opposite to the circular truncated cone-shaped groove at the upper part of the magnet collector body and the circular truncated cone-shaped groove at the bottom of the magnet collector body.
During specific operation, the two half magnet collector bodies are buckled and then fixed through the first fixing piece 9 and the second fixing piece 10 to realize the fixation of the whole magnet collector, the first fixing piece 9 and the second fixing piece 10 are bolts or screws, the bolts can enhance the material strength of the joint of the magnet collector, axial pressing force can be provided through the screws, the contact positions of the two half magnet collector bodies are separated through the insulating layer 11 to prevent the positions of conductor connection, during machining, the discharge coil is installed and placed, and then a metal pipe fitting to be machined is placed into the cylindrical machining area 12 formed by the through holes to be machined.
Claims (4)
1. An open-close magnetic collector for pipe electromagnetic pulse forming is characterized by comprising a cylindrical magnetic collector body, wherein the magnetic collector body comprises two half magnetic collector bodies which are buckled with each other;
the two half magnetic collector bodies are divided into an upper structure (1), a middle structure (2) and a lower structure (3) from top to bottom, a first connecting part (4), a notch (7) and a second connecting part (5) are arranged on one side of each half magnetic collector body, and a third connecting part (6) is arranged on the other side of each half magnetic collector body, wherein the first connecting part (4) is positioned on the upper structure (1), the second connecting part (5) is positioned on the lower structure (3), and the notch (7) and the third connecting part (6) are positioned on the middle structure (2);
the third connecting part (6) in one half of the magnetic collector body is inserted into the gap (7) in the other half of the magnetic collector body;
the first fixing piece (9) penetrates through a first connecting part (4) and a second connecting part (5) in the first half magnet collector body and a third connecting part (6) in the second half magnet collector body to connect the first half magnet collector body and the second half magnet collector body, and the second fixing piece (10) penetrates through the third connecting part (6) in the first half magnet collector body and the first connecting part (4) and the second connecting part (5) in the second half magnet collector body to connect the first half magnet collector body and the second half magnet collector body;
an insulating layer (11) is arranged between the contact surfaces of the two half magnetic collector bodies;
the middle part of the middle structure (2) is provided with a groove (8), and the grooves (8) in the two half magnetic collector bodies form a through hole as a cylindrical processing area (12).
2. The switching magnetic collector for electromagnetic pulse forming of pipe fittings according to claim 1, wherein the first fixing member (9) and the second fixing member (10) are both bolts or screws, and the outer walls of the first fixing member (9) and the second fixing member (10) are wrapped with insulating material layers.
3. The opening and closing magnetic collector for electromagnetic pulse forming of pipe fittings according to claim 1, wherein the cross section of the upper structure (1) and the cross section of the lower structure (3) are both right trapezoid structures, and after the two half magnetic collector bodies are buckled, the top and the bottom of the magnetic collector body form a circular truncated cone-shaped groove.
4. The opening and closing magnetic collector for electromagnetic pulse forming of pipe fittings according to claim 1, wherein the circular truncated cone-shaped groove at the top of the magnetic collector body is communicated with the circular truncated cone-shaped groove at the bottom of the magnetic collector body through the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910774549.9A CN110369597B (en) | 2019-08-21 | 2019-08-21 | Opening and closing magnetic collector for pipe electromagnetic pulse forming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910774549.9A CN110369597B (en) | 2019-08-21 | 2019-08-21 | Opening and closing magnetic collector for pipe electromagnetic pulse forming |
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| Publication Number | Publication Date |
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| CN110369597A CN110369597A (en) | 2019-10-25 |
| CN110369597B true CN110369597B (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910774549.9A Active CN110369597B (en) | 2019-08-21 | 2019-08-21 | Opening and closing magnetic collector for pipe electromagnetic pulse forming |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111922176A (en) * | 2020-08-17 | 2020-11-13 | 华中科技大学 | Magnetic collector, electromagnetic forming impact welding device and application |
| CN113223806B (en) * | 2021-05-08 | 2022-09-23 | 重庆大学 | Hollow magnetic collector for flat multi-turn coil |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5964127A (en) * | 1997-04-12 | 1999-10-12 | Magnet-Physik Dr. Steingroever Gmbh | Process and apparatus for manufacturing metallic hollow bodies with structural bulges |
| CN101905262A (en) * | 2010-07-29 | 2010-12-08 | 哈尔滨工业大学 | Magnetic concentrator structure for magnetic pulse formation |
| CN102744310A (en) * | 2012-07-11 | 2012-10-24 | 哈尔滨工业大学 | Magnetic pulse forming device and method of bimetal composite pipe |
| CN105170766A (en) * | 2015-08-26 | 2015-12-23 | 哈尔滨工业大学 | Magnetic collector for magnetic pulse forming |
| CN206732355U (en) * | 2017-05-17 | 2017-12-12 | 重庆市光学机械研究所 | Electromagnetic pulse welder |
-
2019
- 2019-08-21 CN CN201910774549.9A patent/CN110369597B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5964127A (en) * | 1997-04-12 | 1999-10-12 | Magnet-Physik Dr. Steingroever Gmbh | Process and apparatus for manufacturing metallic hollow bodies with structural bulges |
| CN101905262A (en) * | 2010-07-29 | 2010-12-08 | 哈尔滨工业大学 | Magnetic concentrator structure for magnetic pulse formation |
| CN102744310A (en) * | 2012-07-11 | 2012-10-24 | 哈尔滨工业大学 | Magnetic pulse forming device and method of bimetal composite pipe |
| CN105170766A (en) * | 2015-08-26 | 2015-12-23 | 哈尔滨工业大学 | Magnetic collector for magnetic pulse forming |
| CN206732355U (en) * | 2017-05-17 | 2017-12-12 | 重庆市光学机械研究所 | Electromagnetic pulse welder |
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