CN108655569B - Underwater laser impact die-free incremental forming device and method - Google Patents
Underwater laser impact die-free incremental forming device and method Download PDFInfo
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- CN108655569B CN108655569B CN201810331740.1A CN201810331740A CN108655569B CN 108655569 B CN108655569 B CN 108655569B CN 201810331740 A CN201810331740 A CN 201810331740A CN 108655569 B CN108655569 B CN 108655569B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/356—Working by laser beam, e.g. welding, cutting or boring for surface treatment by shock processing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/03—Observing, e.g. monitoring, the workpiece
- B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/1224—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/18—Working by laser beam, e.g. welding, cutting or boring using absorbing layers on the workpiece, e.g. for marking or protecting purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
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Abstract
The invention provides an underwater laser shock die-free incremental forming device and method, which comprise a computer, a laser emitting system, a laser ranging system and a workpiece bearing system, wherein a laser beam emitted by a femtosecond laser in the laser emitting system is reflected to a beam splitter through a plane reflector, then the laser beam passes through a focusing lens and then the focus is positioned at the H position above the surface of a workpiece, the laser beam emitted by the femtosecond laser is reflected to the beam splitter through the plane reflector, then the focus is positioned at the H position through the focusing lens, the computer receives a signal fed back by the laser ranging instrument and then calculates and displays the distance from a light emitting point of the focusing lens to the H position, and the computer controls the H position to be kept at the position 1-1.5 mm above the surface of the workpiece. The invention uses femtosecond laser to break through water induced shock wave as a force source, and uses the nonlinear absorption characteristic of a transparent medium to focused ultrafast laser to ensure that water is used as a restraint layer and an absorption layer, i.e. the restraint layer and the absorption layer are integrated, thereby realizing the gradual forming of a workpiece.
Description
Technical Field
The invention relates to the field of laser shock forming and incremental forming, in particular to an underwater laser shock die-free incremental forming device and method.
Background
Micro plastic forming is an important technology for manufacturing micro metal parts, and plays an increasingly important role in the emerging strategic fields of industrial sensors, MEMS, micro robots and the like. However, the conventional micro plastic forming requires a micro mold, which not only increases the manufacturing cost and prolongs the product development cycle, but also causes technical obstacles for limiting the development of the micro plastic forming of the mold due to the friction between the mold and the material, the strict centering requirement of the micro concave-convex mold and the difficulty in demolding after forming. Incremental forming, the resulting target part size and properties are determined primarily by the forces and relative motion between the tool and the material. This technique has attracted considerable attention in recent years due to the combination of the advantages of "no mold", "rapid prototyping", and ease of intelligent manufacturing. However, the progressive forming technology has defects in forming efficiency, geometric accuracy and surface quality control, and the foil is easy to wrinkle and crack in the process of forming a complex shape, which seriously affects the wide application of the technology. The scholars have proposed many new incremental forming techniques, with comparative possibilities including: the method mainly comprises the steps of laser-assisted incremental forming, double-sided incremental forming, electromagnetic-assisted incremental forming, electric-heating-assisted incremental forming and the like, and the geometric accuracy and the surface quality are improved by changing the physical properties of materials in the forming process. In recent years, with the development of laser technology, laser shock forming has received general attention, and laser shock forming realizes plastic deformation of metal foil by using the force effect generated by laser-induced shock waves.
Chinese patent CN1751837A discloses an underwater laser shock forming method, in which an elastic film belt is arranged in front of a workpiece as an absorption layer, after laser irradiation, the absorption layer is partially gasified and ionized to form shock waves, and the shock waves are transmitted in water for a certain distance and then act on the surface of the workpiece to cause plastic deformation. Although the method considers the inconvenience of directly coating the absorption layer on the surface of the workpiece, the shock wave pressure transmitted to the surface of the workpiece is reduced due to the attenuation effect of the medium water, and the elastic membrane belt has certain attenuation effect on the shock wave pressure peak value, so the forming effect is greatly weakened.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an underwater laser shock die-free incremental forming device and method, which utilize femtosecond laser to break through water induced shock waves as a force source and utilize the nonlinear absorption characteristic of a transparent medium to focused ultrafast laser to enable water to be used as a constraint layer and an absorption layer, namely, the constraint layer and the absorption layer are integrated to realize workpiece incremental forming.
The present invention achieves the above-described object by the following technical means.
An underwater laser shock die-free incremental forming device comprises a computer, a laser emitting system, a laser ranging system and a workpiece bearing system;
the workpiece bearing system comprises a water tank for containing water, a bearing clamp, a three-dimensional moving platform and a three-dimensional moving platform controller; the workpiece is arranged in the water tank through the bearing clamp and is positioned below the upper surface of the water layer, the water tank is arranged on the three-dimensional moving platform, and the three-dimensional moving platform controller is electrically connected with the computer and the three-dimensional moving platform so as to control the workpiece to accurately move in the three-dimensional direction according to the processing track;
the laser emission system comprises a femtosecond laser controller, a femtosecond laser, a plane reflector, a beam splitter and a focusing lens, wherein the femtosecond laser controller is electrically connected with a computer and the femtosecond laser, a first laser beam emitted by the femtosecond laser is reflected to the beam splitter by the plane reflector and then passes through the focusing lens, and the focus of the first laser beam is positioned at an H position which is positioned above the surface of a workpiece;
the laser range finder system comprises a laser range finder controller and a laser range finder, the laser range finder is electrically connected with the laser range finder controller and a computer, a second laser beam emitted by the laser range finder returns to the laser range finder according to an original light path after reaching the surface of a workpiece through a beam splitter and a focusing lens, the computer receives a signal fed back by the laser range finder and then calculates and displays the distance from a light emitting point of the focusing lens to an H position, and the computer controls the movement of a three-dimensional moving platform to enable the H position where a focus is located to be kept 1-1.5 mm above the surface of the workpiece.
Preferably, the distance between the upper surface of the workpiece and the upper surface of the water layer in the water tank is not less than 5 mm.
Preferably, the bearing clamp comprises two supporting blocks, pressing blocks are arranged on the two supporting blocks, and two ends of the workpiece are respectively placed on the two supporting blocks and are respectively pressed through the pressing blocks.
Preferably, the bearing clamp comprises two supporting blocks, V-shaped block assemblies are arranged on the opposite side walls of the two supporting blocks, each V-shaped block assembly comprises an upper pressing block and a lower pressing block, a V-shaped groove is formed in the upper surface of each lower pressing block, a protrusion matched with the V-shaped groove is arranged on the lower surface of each upper pressing block, the upper surface of each lower pressing block can be tightly attached to the lower surface of the corresponding upper pressing block, the two ends of a workpiece are respectively arranged between the upper pressing block and the lower pressing block of the two V-shaped block assemblies, and threaded holes are formed in the two ends of each upper pressing block (801) and the two ends of each lower pressing block and are fixedly connected.
Preferably, the workpiece bearing system further comprises an organic glass plate, wherein two ends of the organic glass plate are arranged on the pressing block, and the fluctuation of a water layer above the workpiece is controlled.
Preferably, a plurality of exhaust holes are formed in the organic glass plate.
Preferably, the first laser beam emitted by the femtosecond laser device is in the horizontal direction, the included angle between the plane mirror and the horizontal direction is 45 degrees, the beam splitter is arranged right below the plane mirror, the mirror surface of the beam splitter is mutually vertical to the mirror surface of the plane mirror, and the focusing lens is horizontally arranged below the beam splitter.
A progressive forming method using an underwater laser shock die-free progressive forming device comprises the following steps:
the method comprises the following steps: cleaning the surface of the workpiece by using alcohol or acetone to remove oil stains and impurities, and ensuring that the surface of the workpiece does not absorb bubbles after the workpiece enters water;
step two: clamping two ends of a workpiece on a bearing clamp to ensure that the upper surface of the workpiece is horizontally arranged;
step three: injecting water into the water tank, and placing the organic glass plate, wherein the upper surface of the water layer is at least 5mm away from the upper surface of the workpiece;
step four: the laser range finder sends out first test laser, the laser range finder controller receives signal feedback and then inputs the signal feedback into the computer, and the computer calculates and displays the distance from the light-emitting point of the focusing lens to the position H;
step five: the computer controls the three-dimensional moving platform to start, the workpiece is moved to an initial processing position, and the focal point of the laser beam is ensured to be positioned 1-1.5 mm above the surface of the workpiece;
step six: starting a femtosecond laser to carry out first impact, and carrying out plastic deformation on a workpiece after the impact is finished;
step seven: and repeating the fourth step to the sixth step, controlling the three-dimensional moving platform to move according to a set track through the computer, and inducing the workpiece to realize accurate incremental forming after multiple times of impact.
The invention has the beneficial effects that:
1) the invention utilizes the performance that the ultrafast laser can be shortened to femtosecond magnitude in a time domain and can be focused to micron magnitude in a space domain, and can effectively improve the precision and controllability of the micro-plasticity progressive forming without the die;
2) the ultrafast laser is used for replacing a tool head as a force source, so that the progressive forming of the metal foil can be realized, and the automation degree is high;
3) compared with conventional laser impact forming, the laser beam emitted by the femtosecond laser passes through the focusing lens, and the focal position is kept 1-1.5 mm above the surface of the workpiece, so that water is used as an absorption layer and a restraint layer, the inconvenience of coating the absorption layer and updating the absorption layer on line is eliminated, and the precision and controllability of the die-free micro-plastic incremental forming are effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of an underwater laser shock die-less incremental forming device according to the invention.
FIG. 2 is a schematic diagram of the femtosecond laser impact progressive forming principle of the invention.
Fig. 3 is a schematic structural diagram of the load-bearing clamp of the present invention.
Figure 4 is a top view of the V-block assembly of the present invention.
FIG. 5 is a graph showing the effect of the experiment according to the embodiment of the present invention.
In the figure: 1-femtosecond laser, 2-light guide pipe, 3-plane reflector, 4-beam splitter, 5-focusing lens, 6-laser range finder, 7-laser range finder controller, 8-bearing clamp, 801-upper pressing block, 802-lower pressing block, 9-three-dimensional moving platform, 10-workpiece, 11-water tank, 12-three-dimensional moving platform controller, 13-computer, 14-femtosecond laser controller, 15-first laser beam, 16-plasma, 17-shock wave, 18-organic glass plate and 19-second laser beam.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
As shown in fig. 1, the underwater laser shock mold-less incremental forming device of the present invention includes a computer 13, a laser emitting system, a laser ranging system, and a workpiece carrying system.
As shown in fig. 1, the workpiece carrying system comprises a water tank 11 for containing water, a carrying clamp 8, a three-dimensional moving platform 9, a plexiglass plate 18 and a three-dimensional moving platform controller 12; the bearing clamp 8 is positioned in the water tank 11 and comprises two supporting blocks, pressing blocks are arranged on the two supporting blocks, two ends of the workpiece 10 are respectively placed on the two supporting blocks, are respectively pressed through the pressing blocks and are positioned below the upper surface of the water layer, and the distance between the upper surface of the workpiece 10 and the upper surface of the water layer in the water tank 11 is not less than 5 mm. Two ends of the organic glass plate 18 are arranged on the pressing blocks to control the fluctuation of the water layer above the workpiece 10. The plexiglass plate 18 is provided with a plurality of vent holes. The water tank 11 is installed on the three-dimensional moving platform 9, and the three-dimensional moving platform controller 12 is electrically connected with the computer 13 and the three-dimensional moving platform 9 to control the workpiece 10 to precisely move in the three-dimensional direction according to the processing track.
Preferably, as shown in fig. 3 and 4, the bearing clamp 8 includes two support blocks, V-shaped block assemblies are disposed on opposite side walls of the two support blocks, each V-shaped block assembly includes an upper press block 801 and a lower press block 802, a V-shaped groove is disposed on an upper surface of the lower press block 802, a protrusion matched with the V-shaped groove is disposed on a lower surface of the upper press block 801, an upper surface of the lower press block 802 can be tightly attached to a lower surface of the upper press block 801, two ends of the workpiece 10 are respectively disposed between the upper press block 801 and the lower press block 802 of the two V-shaped block assemblies, and two ends of the upper press block 801 and the lower press block 802 are both provided with threaded holes and are fixedly connected through bolts. The foil is prevented from deforming by the two V-block assemblies.
Laser emission system includes femto second laser controller 14, light pipe 2, femto second laser 1, plane mirror 3, beam splitter 4 and focusing lens 5, femto second laser controller 14 is connected with computer 13 and femto second laser 1 electricity, first laser beam 15 that femto second laser 1 launched is the horizontal direction, plane mirror 3 is 45 with the contained angle of horizontal direction, beam splitter 4 sets up under plane mirror 3, beam splitter 4 mirror surface and plane mirror 3 mirror surface mutually perpendicular, focusing lens 5 level is arranged in the below of beam splitter 4. A first laser beam 15 emitted by the femtosecond laser 1 is reflected to the beam splitter 4 through the light guide tube 2 and the plane reflector 3, and then is focused at a position 1-1.5 mm above the surface of the workpiece 10 after passing through the focusing lens 5. .
The laser ranging system comprises a laser range finder controller 7 and a laser range finder 6, the laser range finder 6 is electrically connected with the laser range finder controller 7 and a computer 13, the laser range finder 6 emits a second laser beam 19 to reach the surface of the workpiece 10 through a beam splitter 4 and a focusing lens 5 and then returns to the laser range finder 6 according to an original light path, the computer 13 receives a signal fed back by the laser range finder 6 and then calculates and displays the distance from a light emitting point of the focusing lens 5 to an H position, and the computer 13 controls the movement of the three-dimensional moving platform 12 to enable a focus position to be kept at a position 1-1.5 mm above the surface of the workpiece 10.
The invention relates to a progressive forming method of an underwater laser shock die-free progressive forming device, which comprises the following steps:
the method comprises the following steps: cleaning the surface of the workpiece 10 by using alcohol or acetone to remove oil stains and impurities, and ensuring that the surface of the workpiece 10 does not absorb bubbles after entering water;
step two: flattening the workpiece 10, clamping two ends of the workpiece on a bearing clamp 8, and ensuring that the upper surface of the workpiece 10 is horizontally arranged;
step three: injecting water into the water tank 11, putting the organic glass plate 18 into the water tank, and enabling the upper surface of the water layer to be at least 5mm away from the upper surface of the workpiece 10;
step four: the laser range finder 6 emits first test laser, the laser range finder controller 7 receives signal feedback and then inputs the signal feedback into the computer 13, and the computer 13 calculates and displays the distance from the light emitting point of the focusing lens 5 to the position H;
step five: the computer 13 controls the three-dimensional moving platform 9 to start, moves the workpiece 10 to an initial processing position, and ensures that the focal point of the laser beam is 1-1.5 mm above the surface of the workpiece 10;
step six: starting the femtosecond laser 1 to carry out first impact, and after the impact is finished, carrying out plastic deformation on the workpiece 10;
step seven: and repeating the fourth step to the sixth step, controlling the three-dimensional moving platform 9 to move according to a set track through the computer 13, and inducing the workpiece 10 to realize accurate incremental forming after multiple times of impact.
The working principle of the invention is as follows: as shown in fig. 2, when the femtosecond laser 1 emits the first laser beam 15, the dielectric water is instantaneously broken down to form high-temperature plasma 16, and at the same time, a compression shock wave 17 with ultra-high peak pressure is formed on the surrounding dielectric, and the workpiece 10 is plastically deformed by the shock wave 17.
In this embodiment, the femtosecond laser has a central wavelength of 800nm, a maximum energy of 500 μ J, a pulse width adjustable from 80fs to 800fs, a repetition frequency from 1Hz to 1kHz, a spot diameter of the first laser beam 15 output from the femtosecond laser 1 of 6mm, a focal length of the focusing lens 5 of 1000mm, and a sample of 20 μm thick aluminum foil. Fig. 5 is a diagram showing the appearance of pits on the foil, which correspond to 1-2.5mm from top to bottom in sequence when the distances between the focal point of the first laser beam 15 output by the femtosecond laser 1 after passing through the focusing lens 5 and the surface of the foil are respectively 1mm, 1.5mm, 2mm and 2.5mm, and the pits are more obvious when the defocusing is 1mm and 1.5 mm.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (8)
1. An underwater laser shock die-free incremental forming device is characterized by comprising a computer (13), a laser emitting system, a laser ranging system and a workpiece bearing system;
the workpiece bearing system comprises a water tank (11) for containing water, a bearing clamp (8), a three-dimensional moving platform (9) and a three-dimensional moving platform controller (12); the workpiece (10) is arranged in a water tank (11) through a bearing clamp (8) and is positioned below the upper surface of a water layer, the water tank (11) is arranged on a three-dimensional moving platform (9), and a three-dimensional moving platform controller (12) is electrically connected with a computer (13) and the three-dimensional moving platform (9) so as to control the workpiece (10) to accurately move in the three-dimensional direction according to a processing track;
the laser emission system comprises a femtosecond laser controller (14), a femtosecond laser device (1), a plane mirror (3), a beam splitter (4) and a focusing lens (5), wherein the femtosecond laser controller (14) is electrically connected with a computer (13) and the femtosecond laser device (1), a first laser beam (15) emitted by the femtosecond laser device (1) is reflected to the beam splitter (4) through the plane mirror (3), then passes through the focusing lens (5) and then is focused at an H position, and the H position is positioned above the surface of a workpiece (10);
the laser ranging system comprises a laser range finder controller (7) and a laser range finder (6), wherein the laser range finder (6) is electrically connected with the laser range finder controller (7) and a computer (13), a second laser beam (19) emitted by the laser range finder (6) returns to the laser range finder (6) according to an original light path after reaching the surface of a workpiece (10) through a beam splitter (4) and a focusing lens (5), the computer (13) calculates and displays the distance from a light emitting point of the focusing lens (5) to an H position after receiving a signal fed back by the laser range finder (6), and the computer (13) controls the movement of a three-dimensional moving platform (9) to enable the H position where a focus is located to be kept at a position 1-1.5 mm above the surface of the workpiece (10).
2. The underwater laser shock die-less incremental forming apparatus according to claim 1, wherein a distance between an upper surface of the workpiece (10) and an upper surface of a water layer in the water tank (11) is not less than 5 mm.
3. The underwater laser shock die-less incremental forming device of claim 1, wherein the carrying clamp (8) comprises two supporting blocks, pressing blocks are arranged on the two supporting blocks, and two ends of the workpiece (10) are respectively placed on the two supporting blocks and are respectively pressed by the pressing blocks.
4. The underwater laser shock die-free incremental forming device of claim 1, wherein the bearing clamp (8) comprises two support blocks, V-shaped block assemblies are arranged on opposite side walls of the two support blocks, each V-shaped block assembly comprises an upper pressing block (801) and a lower pressing block (802), a V-shaped groove is formed in the upper surface of each lower pressing block (802), a protrusion matched with the V-shaped groove is formed in the lower surface of each upper pressing block (801), the upper surface of each lower pressing block (802) can be tightly attached to the lower surface of each upper pressing block (801), two ends of the workpiece (10) are respectively arranged between the upper pressing block (801) and the lower pressing block (802) of the two V-shaped block assemblies, and two ends of each upper pressing block (801) and each lower pressing block (802) are provided with threaded holes and fixedly connected through bolts.
5. The underwater laser shock die-less incremental forming device of claim 3, wherein the workpiece carrying system further comprises a plexiglas plate (18), both ends of the plexiglas plate (18) being placed on the compaction blocks to control water layer fluctuation above the workpiece (10).
6. The underwater laser shock die-less incremental forming device according to claim 5, wherein the organic glass plate (18) is provided with a plurality of vent holes.
7. The underwater laser shock die-free incremental forming device of claim 1, wherein the first laser beam (15) emitted by the femtosecond laser (1) is in a horizontal direction, the included angle between the plane mirror (3) and the horizontal direction is 45 degrees, the beam splitter (4) is arranged right below the plane mirror (3), the mirror surface of the beam splitter (4) is perpendicular to the mirror surface of the plane mirror (3), and the focusing lens (5) is horizontally arranged below the beam splitter (4).
8. A progressive forming method by using the underwater laser shock die-free progressive forming device of any one of claims 1 to 7, characterized by comprising the following steps:
the method comprises the following steps: cleaning the surface of the workpiece (10) by using alcohol or acetone to remove oil stains and impurities, and ensuring that the surface of the workpiece (10) can not absorb bubbles after entering water;
step two: clamping two ends of a workpiece (10) on a bearing clamp (8) to ensure that the upper surface of the workpiece (10) is horizontally arranged;
step three: injecting water into the water tank (11), putting an organic glass plate (18), wherein the upper surface of the water layer is at least 5mm away from the upper surface of the workpiece (10);
step four: the laser range finder (6) sends out first test laser, the laser range finder controller (7) receives signal feedback and then inputs the signal feedback into the computer (13), and the computer (13) calculates and displays the distance from the light emitting point of the focusing lens (5) to the H position;
step five: the computer (13) controls the three-dimensional moving platform (9) to start, moves the workpiece (10) to an initial processing position, and ensures that the focal point of the laser beam is 1-1.5 mm above the surface of the workpiece (10);
step six: starting the femtosecond laser device (1) to carry out first impact, and after the impact is finished, carrying out plastic deformation on the workpiece (10);
step seven: and repeating the fourth step to the sixth step, controlling the three-dimensional moving platform (9) to move according to a set track through the computer (13), and inducing the workpiece (10) to realize accurate incremental forming after multiple times of impact.
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| CN201810331740.1A CN108655569B (en) | 2018-04-13 | 2018-04-13 | Underwater laser impact die-free incremental forming device and method |
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| CN109604416B (en) * | 2018-12-14 | 2019-12-31 | 安徽工业大学 | Method and device for forming metal plate shock wave |
| CN109482750A (en) * | 2018-12-24 | 2019-03-19 | 广东工业大学 | A kind of micro- riveting set of no rivet |
| CN110614429B (en) * | 2019-08-23 | 2021-09-10 | 江苏大学 | Laser-induced cavitation forming device and method |
| CN113584297A (en) * | 2021-07-30 | 2021-11-02 | 山东大学 | Method for improving underwater femtosecond laser shock processing strength |
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