CN112427525A - Electromagnetic pulse boosting type bulging method - Google Patents
Electromagnetic pulse boosting type bulging method Download PDFInfo
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- CN112427525A CN112427525A CN202011435595.5A CN202011435595A CN112427525A CN 112427525 A CN112427525 A CN 112427525A CN 202011435595 A CN202011435595 A CN 202011435595A CN 112427525 A CN112427525 A CN 112427525A
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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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- 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
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
- B21D15/06—Corrugating tubes transversely, e.g. helically annularly
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Abstract
The invention discloses an electromagnetic pulse boosting type bulging method, and belongs to the field of material plastic forming. The invention is carried out according to the following steps: s1, placing a pipe material to be formed in a female die, placing an bulging coil in the middle of the inner side of the pipe material, placing boosters at two end parts of the pipe material respectively, arranging rubber cushion blocks between the boosters and the pipe material, and sequentially and respectively arranging a driving sheet and a boosting coil at one end of each booster, which is far away from the pipe material; s2, energizing the coil, pressing the pipe material into the female die by radial electromagnetic force in an outward direction, generating axial movement by the driving sheet under the action of axial magnetic field force generated by the boosting coil to drive the booster to move axially, and generating axial shrinkage on the pipe material to boost the end part, thereby completing uniform bulging of the pipe material. The invention overcomes various problems of the aluminum alloy corrugated pipe manufactured by the traditional forming method in the prior art, can effectively improve the bulging limit of the pipe material, has high forming speed, and is suitable for processing the corrugated pipe made of high-conductivity materials such as aluminum-magnesium alloy and the like.
Description
Technical Field
The invention relates to the technical field of plastic forming of materials, in particular to an electromagnetic pulse boosting type bulging method.
Background
The aluminum alloy corrugated pipe fitting has the advantages of corrosion resistance, light weight, good comprehensive mechanical property and the like, and is widely applied to the fields of military and national defense, aerospace, oil and gas transportation and the like. At present, the aluminum alloy corrugated pipe fitting adopts press bending welding composite forming, spinning forming and hydraulic forming, and the main problems of the press bending forming are as follows: in the forming process of the corrugated pipe, ribs are firstly pressed on a flat plate, and the molded surface of the corrugated pipe after the ribs are pressed on the flat plate is seriously arched, so that the corrugated pipe cannot be completely attached to the molded surface of a mould to generate shaking when being successively bent on a subsequent bending mould, and the molded surface after being formed is relatively serious in deflection and poor in forming precision. In addition, defects such as welding cracks, incomplete penetration, slag inclusion, pores and appearance defects of welding seams are easy to occur in the welding process, the bearing capacity of the corrugated pipe is reduced due to the defects, brittle fracture is easy to cause, and therefore a large amount of manpower and material resources are consumed to detect the defects in the production process.
The main problems with spin forming are as follows: generally, the spinning passes are more, the surface of a blank is seriously hardened by machining, and a hardened layer is thicker, so that the mouth part of a workpiece after spinning is easy to crack. If an annealing procedure is added in the middle of the multi-pass spinning process, the processing cost is increased, the energy is wasted, and the method is not suitable for batch production. If the number of spinning passes is small, the single-pass thinning amount is too large, and the blank is broken. In addition, if the thinning amount and the deformation speed are set too large in the spinning process, the process parameters are not reasonably matched, the metal materials are easy to accumulate in front of the spinning wheel to generate a bulging phenomenon, and the bulged materials are pressed into the blank by the spinning wheel, so that the surface of the workpiece has scale defects.
The hydraulic forming needs special equipment or the modification of the original equipment, so the early production cost investment is high; meanwhile, the forming process comprises a series of actions of die assembly, liquid filling, pressurization, pressure maintaining, pressure relief, die splitting and the like, so that the process is complex, the influence factors are many, and the requirements on the processing environment and the equipment precision are high. In addition, the tube hydroforming belongs to cold forming, and a large residual stress and internal cracks may be generated inevitably in the forming process. How to better realize the processing of the corrugated pipe fitting is always a continuous pursuit in the industry.
Through retrieval, the Chinese patent application number: 201910190021.7, the name of invention creation is: a zonal electromagnetic forming method and a forming device of a corrugated pipe are disclosed, the method of the application comprises the steps of respectively arranging a radial electromagnetic area and a thermal forming area which can move along the axial direction of the pipe inside and outside the pipe; moving the thermoforming zone to a position to be formed at one end of the tube; heating the thermoforming area to ensure that the pipe fitting is heated and softened at a position to be formed in the range of the thermoforming area; moving the radial electromagnetic zone to a position corresponding to the thermoforming zone; the radial electromagnetic area discharges to form radial electromagnetic force, so that the position to be formed of the pipe fitting expands in the hot forming area to form an expansion corrugated joint; moving the thermoforming zone to the next position of the tube to be formed; and finishing the forming by keeping the circulation.
Also as in chinese patent application No.: 201811301035.3, the name of invention creation is: the bulging device comprises a female die, a branch pipe is arranged on one side of the female die, a mandrel is arranged on the inner side of the female die, a pipe fitting to be formed is sleeved on the outer side of the mandrel, a bulging coil is arranged on the mandrel, a back pressure coil is arranged on the outer side of the upper branch pipe of the female die, an upper axial pushing coil and a lower axial pushing coil are respectively arranged at two ends of the pipe fitting to be formed, and a power supply unit is respectively connected with the bulging coil, the back pressure coil, the upper axial pushing coil and the lower axial pushing coil. The application can greatly improve the axial material supplement of the end part area of the three-way pipe, and the bulging method can effectively inhibit the wall thickness reduction of a bulging area, prevent the bulging phenomenon and improve the forming limit.
The applications all relate to the auxiliary forming by using an electromagnetic forming technology, the electromagnetic forming is a method for forcing a blank to be formed at a high speed under the action of an impact magnetic field force by using an instant high-voltage pulse magnetic field, and the method has the advantages of small resilience, high precision, simple tooling, low cost and the like. In the forming process, a strong electromagnetic field is generated by using the instantaneous discharge of a high-voltage capacitor, so that the blank can obtain a large magnetic field force and a high speed. The forming speed is very high, the deformation time is microsecond, the plastic deformation capacity of the material can be obviously improved, the size precision of parts is high, the die is simple, and the composite processing is easy to realize, so that the forming technology becomes an important metal forming technology, and how to effectively utilize the electromagnetic forming technology is also a hotspot of research in the industry.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome various problems of an aluminum alloy corrugated pipe manufactured by using a traditional forming method in the prior art, and provides an electromagnetic pulse boosting type bulging method which can effectively improve the bulging limit of a pipe material, has high forming speed and microsecond deformation time, can obviously improve the plastic deformation capacity of the material, has high dimensional precision of parts, is simple in mold, is easy to realize composite processing, and is suitable for processing the corrugated pipe made of high-conductivity materials such as aluminum-magnesium alloy and the like.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses an electromagnetic pulse boosting type bulging method, which uses a bulging device and comprises the following steps:
s1, placing a pipe material to be formed in a female die of an expanding device, placing an expanding coil in the middle of the inner side of the pipe material, placing boosters at two ends of the pipe material respectively, and arranging rubber cushion blocks between the boosters and the pipe material, wherein one ends of the boosters, which are far away from the pipe material, are sequentially and respectively provided with a driving sheet and a boosting coil;
s2, energizing the coil, pressing the pipe material into the female die by radial electromagnetic force in an outward direction, generating axial movement by the driving sheet under the action of axial magnetic field force generated by the boosting coil to drive the booster to move axially, and generating axial shrinkage on the pipe material to boost the end part, thereby completing uniform bulging of the pipe material.
Furthermore, the bulging device comprises a female die for placing the pipe material, a bulging coil is further arranged in an inner cavity of the female die, boosting coils are respectively arranged at two ends of the female die, and a driving sheet and a booster are sequentially arranged between the boosting coils and the bulging coil; the boosting coil and the bulging coil are also respectively connected with the power supply unit.
Furthermore, a rubber cushion block is arranged between the booster and the bulging coil.
Furthermore, a matching groove for the end part of the pipe to pass through is formed in the rubber cushion block, a matching groove for positioning the pipe is correspondingly formed in the booster, and the end part of the pipe extends into the booster after passing through the rubber cushion block.
Furthermore, the bulging coil is formed by connecting a plurality of sub-coils in series and is coaxially and symmetrically arranged with the pipe material to be formed.
Furthermore, a magnetic collector is arranged between the bulging coil and the pipe material to be formed.
Furthermore, the side wall of the cavity of the female die is correspondingly provided with a groove for forming, and the rear part of each forming groove is provided with a through exhaust hole.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the electromagnetic pulse boosting type bulging method has the advantages that the forming speed is high, the deformation time is microsecond, the plastic deformation capacity of the material can be remarkably improved, the size precision of parts is high, the die is simple, and the composite processing is easy to realize.
(2) The invention relates to an electromagnetic pulse boosting type bulging method, wherein a boosting coil and a driving sheet are additionally arranged at the end part of a pipe material to be formed, and the driving sheet axially moves under the action of electromagnetic force generated by the boosting coil, so that the end part boosting is realized while the pipe material to be formed is bulged, and the problem of breakage caused by transitional thinning of a pipe fitting is avoided.
(3) According to the electromagnetic pulse boosting type bulging method, a booster and a rubber cushion block are arranged in a matched mode besides a boosting coil and a driving sheet, so that the defects of local folds and even instability of a pipe fitting and the like caused by overlarge axial feeding force are effectively avoided, and the forming limit of a pipe material to be formed in bulging is improved.
(4) According to the electromagnetic pulse boosting type bulging method, the used bulging device is provided with the vent hole communicated with the outside at the rear part of each forming groove of the female die and used for exhausting air generated between the female die and a pipe material during forming, high air resistance caused by high-speed deformation of the pipe material is avoided, pits are prevented from being generated on the local part of the pipe material, and the forming quality is further guaranteed.
Drawings
FIG. 1 is a schematic view of the expanding device of the present invention;
FIG. 2 is a schematic structural view of the pipe material after forming of the bulging device of the present invention;
FIG. 3 is a schematic view of a certain configuration of the expanding device of the present invention;
FIG. 4 is a schematic view of a certain configuration of the expanding device of the present invention;
FIG. 5 is a schematic view of a certain configuration of the expanding device of the present invention;
FIG. 6 is a schematic view of a certain configuration of the expanding device of the present invention;
FIG. 7 is a schematic view of a certain configuration of the expanding device of the present invention;
the reference numerals in the schematic drawings illustrate:
100. a female die; 101. pipe material; 102. bulging coils; 103. a coil holder; 104. an upper booster coil holder; 105. an upper booster coil; 106. an upper driving plate; 107. an upper booster; 108. mounting a rubber cushion block; 109. a lower rubber cushion block; 110. a lower booster; 111. a lower driving plate; 112. a lower boost coil; 113. a lower booster coil holder; 114. an exhaust hole; 115. a first power supply unit; 116. a second power supply unit; 117. a third power supply unit; 118. a fourth power supply unit; 119. a fifth power supply unit; 120. a sixth power supply unit; 121. a magnetic collector.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
As shown in fig. 1-3, the electromagnetic pulse boosting type bulging device of the present embodiment includes a female die 100 for placing a pipe material 101, a groove for forming a corrugated pipe is correspondingly formed on a side wall of an inner cavity of the female die 100, a bulging coil 102 is further disposed in the inner cavity of the female die 100, the bulging coil 102 is located in the middle of the inner side of the pipe material 101, boosting coils are respectively disposed at two ends of the female die 100, and a driving plate and a booster are sequentially disposed between the boosting coils and the bulging coil 102; the boosting coil and the bulging coil 102 are also respectively connected with a power supply unit for controlling whether the boosting coil and the bulging coil 102 generate electromagnetic force.
Specifically, in this embodiment, the bulging coil 102 is mounted on the coil base 103, the boosting coils at two ends of the die 100 are an upper boosting coil 105 and a lower boosting coil 112, respectively, the upper boosting coil 105 is mounted on the upper boosting coil base 104, the lower boosting coil 112 is mounted on the lower boosting coil base 113, the driving plates at two ends are also an upper driving plate 106 and a lower driving plate 111, respectively, a booster is further disposed between the driving plates and the bulging coil 102, specifically, an upper booster 107 is disposed between the upper driving plate 106 and the upper end of the bulging coil 102, a lower booster 110 is disposed between the lower driving plate 111 and the lower end of the bulging coil 102, the driving plates are made of materials with good electromagnetic properties, such as aluminum, copper, and the booster is made of materials with good rigidity, such as steel. In actual use, the driving plate is located between the boosting coil and the two end parts of the pipe material 101, and the booster is located below the driving plate, namely, between the driving plate and the two end parts of the pipe material 101. During processing, the boosting coil and the bulging coil 102 are electrified respectively, then the pipe material 101 to be formed is pressed into the groove of the female die 100 under the action of the radial electromagnetic force in the outward direction, the driving sheet axially moves under the action of the axial magnetic field force generated by the boosting coil, so that the booster is driven to axially move, the two ends of the pipe material 101 in the booster are axially contracted finally, the uniform bulging of the pipe material 101 is completed, and the problem that the corrugated pipe formed by the pipe material 101 is thinned in a transition manner to break is avoided. In practical application, the driving sheet belongs to a loss part, the driving sheet and the booster are utilized to complete boosting action together, loss of the driving sheet can be effectively reduced, only the driving sheet can be replaced during replacement, the booster with a steel structure can be used for a long time, and production cost is effectively reduced.
According to the formed corrugated pipe structure, the corrugated pipe structure is adapted to the structural design of the female die 100, in this embodiment, the driving plate and the booster are correspondingly arranged at two ends of the female die 100 in an annular structure, as shown in fig. 2, the booster includes a base portion for pressing against the end portion of the female die 100, and an embedded portion embedded into the female die 100, the embedded portion is an annular protrusion protruding from the center of the base portion along the circumferential direction, wherein a matching groove matched with the pipe 101 is correspondingly arranged on a wall surface of the booster opposite to the pipe 101, that is, the matching groove matched with the pipe 101 is arranged on the embedded portion, and the end portion of the pipe 101 is correspondingly embedded into the matching groove when the booster is installed and used, so that the pipe 101 can be effectively positioned in the forming process, the pipe 101 is stabilized on the basis of boosting, and the forming effect and stability are ensured.
As shown in fig. 3, the power supply unit in the present embodiment includes a plurality of power supply subunits, specifically, a first power supply unit 115, a second power supply unit 116, and a third power supply unit 117; each power supply subunit comprises a power supply, an energy storage capacitor, a voltage division resistor and a switch which are sequentially connected in series, wherein the bulging coil 102 is connected with the second power supply unit 116, the upper boosting coil 105 is connected with the first power supply unit 115, and the lower boosting coil 112 is connected with the third power supply unit 117.
Example 2
The electromagnetic pulse boosting type bulging device of the embodiment is basically the same as embodiment 1, and further, in this embodiment, in order to further ensure the forming stability and prevent instability in the boosting process, a rubber cushion block is further arranged between the booster and the bulging coil 102, that is, the rubber cushion block is arranged between the booster and two end portions of the pipe material 101, a matching groove for the end portion of the pipe material 101 to pass through is formed in the rubber cushion block, and the end portion of the pipe material 101 extends into the booster after passing through the rubber cushion block. Specifically, an upper rubber pad 108 is arranged between the upper booster 107 and the upper end of the bulging coil 102, and a lower rubber pad 109 is arranged between the lower booster 110 and the lower end of the bulging coil 102. The driving sheet, the booster and the rubber cushion block are sequentially arranged between the boosting coil and the bulging coil 102, one end of the rubber cushion block abuts against the booster, and the other end of the rubber cushion block abuts against the bulging coil 102, so that the defects of local wrinkles and even instability of the pipe material 101 caused by overlarge axial feeding force are effectively avoided, the forming limit of the pipe material 101 to be formed in bulging is improved, and the forming quality is guaranteed.
Example 3
The electromagnetic pulse boosting type bulging device of the present embodiment is substantially the same as embodiment 2, and further, in the present embodiment, an air vent 114 penetrating through the outside is formed at the rear of each forming groove of the female die 100, specifically as shown in fig. 1, for exhausting air generated between the female die 100 and the tube 101 during forming, so as to avoid high air resistance caused by high-speed deformation of the tube 101, prevent a local pit of the tube 101 from occurring, and further ensure forming quality.
Example 4
An electromagnetic pulse boosting type bulging device of the present embodiment is basically the same as the above-mentioned embodiments, except that the power supply unit of the present embodiment is slightly different, as shown in fig. 4, the power supply unit of the present embodiment includes a fourth power supply unit 118 and a fifth power supply unit 119, specifically, the bulging coil 102 is connected to the fifth power supply unit 119, and the upper boosting coil 105 and the lower boosting coil 112 are connected in series and then connected to the fourth power supply unit 118. Similarly, each power supply subunit comprises a power supply, an energy storage capacitor, a voltage division resistor and a switch which are sequentially connected in series.
Example 5
The electromagnetic pulse boosting type bulging device of the present embodiment is basically the same as the above-mentioned embodiments, except that the power supply unit of the present embodiment is slightly different, as shown in fig. 5, the power supply unit of the present embodiment only uses a sixth power supply unit 120, and the bulging coil 102, the upper boosting coil 105 and the lower boosting coil 112 are all connected to the sixth power supply unit 120.
Example 6
In the present embodiment, basically the same as embodiment 1, further, in the present embodiment, a magnetic collector 121 is disposed between the bulging coil 102 and the tube 101 to be formed, as shown in fig. 6, when in actual use, radial electromagnetic force in an outward direction is generated after the bulging coil 102 is energized, and the electromagnetic force is concentrated by the magnetic collector 121 to a region of the tube 101 to be formed, so that the tube 101 is pressed into the die 100, and the forming is more accurate. Similarly, the power supply unit in this embodiment also employs the first power supply unit 115, the second power supply unit 116, and the third power supply unit 117 in cooperation.
Example 7
The electromagnetic pulse boosting type bulging device of the present embodiment is basically the same as the above-mentioned embodiments, except that, as shown in fig. 7, the bulging coil 102 of the present embodiment is formed by connecting a plurality of sub-coils in series, and is coaxially and symmetrically disposed with the pipe material 101 to be formed, and the power supply unit of the present embodiment also adopts the first power supply unit 115, the second power supply unit 116 and the third power supply unit 117 for cooperation.
The electromagnetic pulse boosting type bulging method using the bulging device of the embodiment comprises the following steps:
s1, placing a pipe material 101 to be formed into a female die 100, placing an expansion coil 102 in the middle of the pipe material 101, placing boosters at two end parts of the pipe material 101 respectively, and arranging rubber cushion blocks between the boosters and the pipe material 101, wherein one ends of the boosters, which are far away from the pipe material 101, are sequentially and respectively provided with a driving sheet and a boost coil;
s2, energizing the coil, pressing the pipe material 101 into the female die 100 by radial electromagnetic force in an outward direction, generating axial movement by the driving sheet under the action of axial magnetic field force generated by the boosting coil to drive the booster to axially move, and performing end boosting by the pipe material 101 after axial contraction to complete uniform bulging of the pipe material 101.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (7)
1. An electromagnetic pulse boosting type bulging method is characterized in that: using a bulging device, the method comprises the following steps:
s1, placing a pipe material (101) to be formed into a female die (100) of an expanding device, placing an expanding coil (102) into the middle of the inner side of the pipe material (101), placing boosters at two end parts of the pipe material (101), arranging a rubber cushion block between the boosters and the pipe material (101), and sequentially and respectively arranging a driving sheet and a boosting coil at one end of each booster, which is far away from the pipe material (101);
s2, energizing the coil, pressing the pipe (101) into the female die (100) by radial electromagnetic force in an outward direction, enabling the driving sheet to axially move under the action of axial magnetic field force generated by the boosting coil to drive the booster to axially move, enabling the pipe (101) to axially contract to boost the end part, and completing uniform bulging of the pipe (101).
2. The electromagnetic pulse assisted bulging method according to claim 1, characterized in that: the bulging device comprises a female die (100) for placing a pipe material (101), a bulging coil (102) is further arranged in an inner cavity of the female die (100), boosting coils are respectively arranged at two ends of the female die (100), and a driving sheet and a booster are sequentially arranged between the boosting coils and the bulging coil (102); the boosting coil and the bulging coil (102) are also respectively connected with a power supply unit.
3. The electromagnetic pulse assisted bulging method according to claim 2, characterized in that: a rubber cushion block is also arranged between the booster and the bulging coil (102).
4. The electromagnetic pulse assisted bulging method according to claim 3, characterized in that: the rubber cushion block is provided with a matching groove for the end part of the pipe material (101) to pass through, the booster is correspondingly provided with a matching groove for positioning the pipe material (101), and the end part of the pipe material (101) passes through the rubber cushion block and then extends into the booster.
5. The electromagnetic pulse assisted bulging method according to claim 2, characterized in that: the bulging coil (102) is formed by connecting a plurality of sub-coils in series and is coaxially and symmetrically arranged with the pipe material (101) to be formed.
6. The electromagnetic pulse assisted bulging method according to claim 2, characterized in that: a magnetic collector (121) is arranged between the bulging coil (102) and the pipe material (101) to be formed.
7. An electromagnetic pulse assisted bulging process according to any one of claims 1-6, characterized in that: grooves for forming are correspondingly formed in the side wall of the inner cavity of the female die (100), and a through exhaust hole (114) is formed in the rear of each forming groove.
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| CN113182446A (en) * | 2021-05-13 | 2021-07-30 | 中南大学 | Current-assisted metal pipe electromagnetic forming device and forming method |
| CN113502379A (en) * | 2021-06-23 | 2021-10-15 | 华中科技大学 | Device and method for eliminating residual stress of workpiece by using pulse electromagnetic force |
| CN113909369A (en) * | 2021-11-09 | 2022-01-11 | 核工业理化工程研究院 | Electromagnetic forming method for single-wave corrugated pipe |
| CN117340085A (en) * | 2023-12-06 | 2024-01-05 | 广州番禺浩业波纹管工业有限公司 | Bellows expansion joint forming equipment and forming method thereof |
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| CN113502379A (en) * | 2021-06-23 | 2021-10-15 | 华中科技大学 | Device and method for eliminating residual stress of workpiece by using pulse electromagnetic force |
| CN113502379B (en) * | 2021-06-23 | 2022-06-07 | 华中科技大学 | Device and method for eliminating residual stress of workpiece by using pulse electromagnetic force |
| CN113909369A (en) * | 2021-11-09 | 2022-01-11 | 核工业理化工程研究院 | Electromagnetic forming method for single-wave corrugated pipe |
| CN113909369B (en) * | 2021-11-09 | 2024-03-19 | 核工业理化工程研究院 | Electromagnetic forming method for single wave corrugated pipe |
| CN117340085A (en) * | 2023-12-06 | 2024-01-05 | 广州番禺浩业波纹管工业有限公司 | Bellows expansion joint forming equipment and forming method thereof |
| CN117340085B (en) * | 2023-12-06 | 2024-02-09 | 广州番禺浩业波纹管工业有限公司 | Bellows expansion joint forming equipment and forming method thereof |
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