نتایج جستجو برای: laser forming process

تعداد نتایج: 1571060  

Journal: :Chemical reviews 2012
Christiane P Koch Moshe Shapiro

1. INTRODUCTION Photoassociation, forming molecules from ultracold atoms using laser light, is a prime example of coherent control: The process is complex and poses many challenges, yet typically the molecular structure is simple enough to identify pathways for control. Laser cooling schemes that work for atoms 1−5 tend to fail for molecules, mainly due to the presence of many near-resonance li...

2010
Adeline Sugianto Jim Bovatsek Stuart Wenham Budi Tjahjono Guangqi Xu Yu Yao Brett Hallam Xue Bai Nicole Kuepper Chee Mun Chong Raj Patel

For many years, the selective emitter approach has been well-known to yield cell efficiencies well above those achieved by conventional screen-printed cells. A simple and effective way of forming a selective emitter can be achieved by laser doping to simultaneously pattern the dielectric with openings as narrow as 8 m, and create heavy doping beneath the metal contacts. In conjunction with las...

Journal: :international journal of advanced design and manufacturing technology 0
hossein ghazavi nosratollah solhjoei

hydro-forming is a fabrication process that uses a fluid medium to form a piece by using high internal pressure. in tube hydro-forming, a tubular blank is placed between two dies, sealed and pressurized water injected, deforming the tube walls in the cavity form of the dies. exist several typical hydro-forming processes such as t- shapes, cross-shapes and y- shapes. successful hydro-forming dep...

The incremental sheet metal forming (ISMF) process is a new and flexible method that is well suited for small batch production or prototyping. This paper studies the use of the finite element method in the incremental forming process of AA1050 sheets to investigate the influence of tool diameter, vertical step size, and friction coefficient on forming force, spring-back, and thickness distribut...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1390

any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...

Journal: :journal of modern processes in manufacturing and production 2013
vahid rikhtehgar nezami behrooz zareh abbas vafaee sefat

in recent years, in order to reducing die design and manufacturing costs, multi point forming technique has gained an increasing interest because of its high flexibility. in this process, the conventional fixed shape solid die sets are replaced with a pair of opposite matrices of controllable elements. in this paper, the fundamental principles of multi-point forming was described and the possib...

Journal: :Journal of the Japan Society for Precision Engineering 2001

2008
Chao Liu

This study presents a finite element method (FEM) based three-dimensional laser forming process design methodology for thin plates to determine the laser scanning paths and heating conditions. The strain fields were first calculated via FEM. The laser scanning paths were chosen perpendicular to the averaged principal minimum strain direction. The ratios of in-plane and bending strain were calcu...

2012
F. H. Liu S. H. Chen R. T. Lee W. S. Lin Y. S. Liao

This paper describes a rapid prototyping (RP) technology for forming a hydroxyapatite (HA) bone scaffold model. The HA powder and a silica sol are mixed into bioceramic slurry form under a suitable viscosity. The HA particles are embedded in the solidified silica matrix to form green parts via a wide range of process parameters after processing by selective laser sintering (SLS). The results in...

Journal: :international journal of advanced design and manufacturing technology 0
mahmoud moradi department of mechanical engineering, faculty of engineering, malayer university, malayer, iran alireza mohazab pak ali khorram department of mechanical engineering, k.n.toosi university of technology,p.o. box 19395-1999, tehran, iran

this study is focused on investigating the parameters of laser percussion drilling process of nickel-base super alloy inconel 718 with thickness of 1 mm. fiber laser with the power of 500 watts was used as the laser source. laser pulse frequency, duty cycle, laser power, focal point position, were assumed as the laser drilling process variables. the hole geometry features, i.e. entrance hole di...

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