Numerical simulation and experimentation of a novel micro scale laser high speed punching

Liu, Huixia; Shen, Zongbao; Wang, Xiao; Wang, Hejun; Tao, Maoke

doi:10.1016/j.ijmachtools.2010.02.003

Cited by 59 publications

(19 citation statements)

References 10 publications

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“…The plasma continues to absorb the laser energy. The rapidly expanding plasma is confined by the transparent confinement layer, and creates a high surface pressure, which propagates into the hump as a shockwave [20,21]. The shockwave drives the hump to impact onto the base plate at a high speed.…”

Section: Mechanism Of Laser Impact Spot Weldingmentioning

confidence: 99%

“…The result showed that apparent element diffusion did not occur across the weld interface. In the LISW process, laser induced shockwave pressure can reach several GPa, but the peak pressure is only maintained for a few nanoseconds [21]. Accordingly, element diffusion occurs with difficulty in the LISW of Ti and Cu.…”

Section: Microstructurementioning

confidence: 99%

“…Works from Wang et al [19] confirmed the finding. peak pressure is only maintained for a few nanoseconds [21]. Accordingly, element diffusion occurs with difficulty in the LISW of Ti and Cu.…”

Section: Microstructurementioning

confidence: 99%

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Investigation on a Novel Laser Impact Spot Welding

Liu

Gao

Zhang

et al. 2016

Metals

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Abstract:In this paper a novel laser impact spot welding (LISW) method is described, in which a hump was formed on the flyer plate on the intended welding spot location by local pre-forming. When the flyer and base plates were placed together to perform welding, the two plates kept in contact over their entire surfaces except at the hump, where a local air gap was enough to guarantee the impact velocity and collision angle to achieve spot welding using laser pulse energy. The presented approach was implemented to join thin titanium foils to copper foils under low laser energy system. Joints with regular shapes were obtained. The microstructure in the weld interface was studied with scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). It was found that the jetting occurred at the central region of the weld spots due to oblique impact. Wave features were observed in the weld interfaces. The impact energy was found to have significant influence on the wave's characteristics. Moreover, SEM images and EDS analysis did not show apparent element diffusion across the weld interface. Besides, the lap shearing test was used to characterize the mechanical properties of the spot welded joints.

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Section: Mechanism Of Laser Impact Spot Weldingmentioning

confidence: 99%

Section: Microstructurementioning

confidence: 99%

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Investigation on a Novel Laser Impact Spot Welding

Liu

Gao

Zhang

et al. 2016

Metals

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“…Elastic waves propagate from soft punch to workpiece, namely from low impedance medium (ρ0C0)2 into the high impedance medium (ρ0C0)1, so σ3 > σ1 according to Equation (8), which means the intensity of transmitted waves is larger than that of incident waves:…”

Section: Soft Punch Hardnessmentioning

confidence: 99%

“…However, there exist difficulties in manufacturing punching tools economically as well as complex alignment problems between micro punch and die in these researches, thus, Rhim et al [7] used silicone rubber instead of the rigid punch as a pressure transmission medium, and punched array of micro-holes on copper and titanium foil successfully with the single crystal silicon die. Liu et al [8] combined laser shock technique with punching process, and developed a new type of micro-forming technology, so that the 250 µm micro-hole was punched successfully on the copper foil of thickness between 10 and 30 µm. This technique used the intense laser beam as the micro punch rather than a traditional punch in order to solve the difficulty of complex punch-to-die alignment and punch fabrication in the process of micro punching to a great extent.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation Research on Micro-Gears Fabrication by Laser Shock Punching Process

Liu

Shen

et al. 2015

Micromachines

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Abstract:The aim of this paper is to fabricate micro-gears via laser shock punching with Spitlight 2000 Nd-YAG Laser, and to discuss effects of process parameters namely laser energy, soft punch properties and blank-holder on the quality of micro-gears deeply. Results show that dimensional accuracy is the best shocked at 1690 mJ. Tensile fracture instead of shear fracture is the main fracture mode under low laser energy. The soft punch might cause damage to punching quality when too high energy is employed. Appropriate thickness and hardness of soft punch is necessary. Silica gel with 200 µm in thickness is beneficial to not only homogenize energy but also propagate the shock wave. Polyurethane films need more energy than silica gel with the same thickness. In addition, blank-holders with different weight levels are used. A heavier blank-holder is more beneficial to improve the cutting quality. Furthermore, the simulation is conducted to reveal typical stages and the different deformation behavior under high and low pulse energy. The simulation results show that the fracture mode changes under lower energy.

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Ultrasonically driven molten resin bulge for the formation of metal micro-structures in laminated die cavity

Zhong

Luo

et al. 2014

Int J Adv Manuf Technol

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This paper proposes the use of ultrasonic bulgeforming process to fabricate T2 copper foil micro-structures. This approach involves the ultrasonic plasticization of powder in a laminated die cavity and the subsequent formation of a molten resin bulge. The laminated die is fabricated by microdouble-staged laminated object manufacturing and is then used as a concave micro-cavity. This technique uses ultrasonic melt polymer powder as a soft punch. Then, T2 copper foils are extruded into the concave die cavity. Consequently, the replication of the micro-bulging parts to the concave microcavity is achieved. This study also determined the appropriate parameters for ultrasonic bulge-forming process. Finally, the micro-two-stage gear, micro-three-stage gear and micro-cone bulge-forming parts were manufactured with good quality. The proposed technology can be applied to effectively reproduce the fine complex structure of concave micro-cavities. In contrast to traditional techniques, this method avoids issues arising from the incorrect location of the concave-convex die.

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Numerical simulation and experimentation of a novel micro scale laser high speed punching

Cited by 59 publications

References 10 publications

Investigation on a Novel Laser Impact Spot Welding

Investigation on a Novel Laser Impact Spot Welding

Experimental and Numerical Simulation Research on Micro-Gears Fabrication by Laser Shock Punching Process

Ultrasonically driven molten resin bulge for the formation of metal micro-structures in laminated die cavity

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