Laser micromachining of bio-absorbable polymers: Impact of the laser process parameters on the machining throughput and quality

2013 ◽  
Author(s):  
Victor V. Matylitsky ◽  
Frank Hendricks ◽  
Rajesh Patel
Keyword(s):  
Process Parameters ◽  
Laser Micromachining ◽  
Laser Process ◽  
Absorbable Polymers

A New Computationally Efficient Model for Tempering in Multi-Tracks Laser Hardening

2009 ◽  
Author(s):  
Alessandro Fortunato ◽  
Leonardo Orazi ◽  
Giovanni Tani
Keyword(s):  
Process Parameters ◽  
Laser Power ◽  
Laser Scanning ◽  
Original Model ◽  
Laser Hardening ◽  
Computationally Efficient ◽  
Laser Process ◽  
Treat All ◽  
Tempering Time ◽  
Experimental Comparisons

The bottleneck in laser hardening principally occurs when large surfaces have to be treated because this process situation leads to multi-tracks laser scanning in order to treat all the component surface. Unfortunately, multi-tracks laser trajectories generate an unwanted tempering effect that depends on the overlapping of two close trajectories. To reduce the softening effects, a simulator capable to optimize the process parameters such as laser power and speed, number and types of trajectories, could sensibly increase the applicability of the process. In this paper an original model for the tempering is presented. By introducing a tempering time factor for the martensitic transformation, the hardness reduction can be predicted according to any laser process parameters, material and geometry. Experimental comparisons will be presented to prove the accuracy of the model.

Selective laser melting of titanium parts: Influence of laser process parameters on macro- and microstructures and tensile property

2019 ◽  
Vol 342 ◽  
pp. 371-379 ◽  
Author(s):  
Dongsheng Sun ◽  
Dongdong Gu ◽  
Kaijie Lin ◽  
Ji Ma ◽  
Wenhua Chen ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Tensile Property ◽  
Process Parameters ◽  
Laser Melting ◽  
Laser Process

scholarly journals Effect of Process Parameters and Material Properties on Laser Micromachining of Microchannels

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 123 ◽  
Author(s):  
Matthew Benton ◽  
Mohammad Hossan ◽  
Prashanth Konari ◽  
Sanjeewa Gamagedara
Keyword(s):  
Process Parameters ◽  
Laser System ◽  
Three Dimensional ◽  
Microfluidic Devices ◽  
Scanning Speed ◽  
Transient Heat Conduction ◽  
Laser Micromachining ◽  
Rapid Phase ◽  
Widespread Application ◽  
Optimization Of Process Parameters

Laser micromachining has emerged as a promising technique for mass production of microfluidic devices. However, control and optimization of process parameters, and design of substrate materials are still ongoing challenges for the widespread application of laser micromachining. This article reports a systematic study on the effect of laser system parameters and thermo-physical properties of substrate materials on laser micromachining. Three dimensional transient heat conduction equation with a Gaussian laser heat source was solved using finite element based Multiphysics software COMSOL 5.2a. Large heat convection coefficients were used to consider the rapid phase transition of the material during the laser treatment. The depth of the laser cut was measured by removing material at a pre-set temperature. The grid independent analysis was performed for ensuring the accuracy of the model. The results show that laser power and scanning speed have a strong effect on the channel depth, while the level of focus of the laser beam contributes in determining both the depth and width of the channel. Higher thermal conductivity results deeper in cuts, in contrast the higher specific heat produces shallower channels for a given condition. These findings can help in designing and optimizing process parameters for laser micromachining of microfluidic devices.

Effect of process parameters on machinability characteristics of CO2 laser process used for cutting SS-304 Stainless steels

2019 ◽  
Vol 18 ◽  
pp. 2065-2072
Author(s):  
K. Rajesh ◽  
V.V. Murali Krishnam Raju ◽  
S. Rajesh ◽  
N. Sudheer Kumar Varma
Keyword(s):  
Co2 Laser ◽  
Process Parameters ◽  
Stainless Steels ◽  
Laser Process ◽  
Ss 304

Laser Micromachining of Silicon Substrates

2009 ◽  
Vol 76-78 ◽  
pp. 416-421 ◽  
Author(s):  
Viboon Tangwarodomnukun ◽  
Jun Wang
Keyword(s):  
Silicon Wafer ◽  
Process Parameters ◽  
Laser Micromachining ◽  
Silicon Substrates ◽  
Basic Concepts

Laser micromachining has been widely used for micro-component fabrication of various materials, such as silicon substrates where silicon wafer is ablated accurately and precisely through marking, scribing, drilling or dicing. Thermal damages can occur on the substrates when improper process parameters and methods are used. This paper presents a review on the micromachining of silicon substrates using conventional and novel lasers as well as water-assisted laser micromachining technologies. The basic concepts and approaches of the technologies are discussed along with the challenges to damage-free laser micromachining at commercially acceptable cutting rates.

scholarly journals Fabrication of superhydrophilic surfaces for long time preservation on 316L stainless steel by ultraviolet laser etching

2022 ◽  
Author(s):  
Chunyang Pan ◽  
Changfeng Xu ◽  
Jun Zhou
Keyword(s):  
Stainless Steel ◽  
Process Parameters ◽  
316L Stainless Steel ◽  
Scanning Speed ◽  
Textured Surface ◽  
Laser Process ◽  
Maintenance Time ◽  
316L Steel ◽  
Long Time ◽  
Good Biocompatibility

Abstract Due to the good biocompatibility, 316L stainless steel is widely used in the manufacture of medical instru-ments and human implants. The super hydrophilic 316L steel surface is used for reducing friction and adhe-sion. By choosing appropriate laser process parameters 316L steel surfaces with super-hydrophilic were ob-tained. The effects of laser process parameters including repeat frequency, pulse width, scanning speed, and the number of scanning were investigated to find the relationship between surface microstructure and wet-ting ability. To investigate the super-hydrophilic maintenance time on the textured surface, the textured sur-faces were preserved in ambident air, distilled water, and absolute ethanol. The results showed that by choosing appropriate laser process parameters surface with super-hydrophilicity can be maintained for 30 days.

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