Parametric Analysis on Surface Roughness of Micro-channel by Fiber Laser Milling on Zirconia (ZrO2)

2020 ◽  
pp. 91-97
Author(s):  
O. F. Biswas ◽  
A. Sen ◽  
G. Kibria ◽  
Biswanath Doloi ◽  
B. Bhattacharyya
Keyword(s):  
Surface Roughness ◽  
Fiber Laser ◽  
Parametric Analysis ◽  
Micro Channel ◽  
Laser Milling

Experimental Study on Roughness Effect for Laminar Micro-Channel Gas Flow

2001 ◽  
Author(s):  
Jih-Hsing Tu ◽  
Fangang Tseng ◽  
Ching-Chang Chieng
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Friction Factor ◽  
Gas Flow ◽  
Micro Channel ◽  
Micro Machining ◽  
Roughness Effect ◽  
Relative Roughness ◽  
Smooth Channel ◽  
Micro Channels

Abstract Present study investigates the roughness effect on laminar gas flow for microchannels ranging from 40 to 600 μm with various roughness heights (40–82 nm) by systematical experiments. The micro-channels are manufactured by micro-machining technology and KOH anisotropic etching is employed to achieve various roughness patterns. Experimental results shows that higher product levels of Reynolds number (Reh) and friction factor (f) are obtained for microchannels of larger size and smaller relative roughness and friction factor f approaches to laminar flow theory value f0 for very smooth channel but the ratio of (f/f0) decreases as the surface roughness increases.

scholarly journals Surface Finish and Back-Wall Dross Behavior during the Fiber Laser Cutting of AZ31 Magnesium Alloy

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 485
Author(s):  
Erika García-López ◽  
Juansethi Ibarra-Medina ◽  
Hector Siller ◽  
Jan Lammel-Lindemann ◽  
Ciro Rodriguez
Keyword(s):  
Surface Roughness ◽  
Magnesium Alloy ◽  
Fiber Laser ◽  
Pulse Energy ◽  
Laser Cutting ◽  
Experimental Models ◽  
Az31 Magnesium Alloy ◽  
Quadratic Model ◽  
Back Wall ◽  
Argon Gas

Magnesium alloys are of increasing interest in the medical industry due to their biodegradability properties and better mechanical properties as compared to biodegradable polymers. Fiber laser cutting of AZ31 magnesium alloy tubes was carried out to study the effect of cutting conditions on wall surface roughness and back-wall dross. During the experiments, an argon gas chamber was adapted in order to avoid material reactivity with oxygen and thus better control the part quality. A surface response methodology was applied to identify the significance of pulse overlapping and pulse energy. Our results indicate minimum values of surface roughness (Ra < 0.7 μm) when the spot overlapping is higher than 50%. A back-wall dross range of 0.24% to 0.94% was established. In addition, a reduction in back-wall dross accumulations was obtained after blowing away the dross particles from inside the tube using an argon gas jet, reaching values of 0.21%. Laser cutting experimental models show a quadratic model for back-wall dross related with the interaction of the pulse energy, and a linear model dependent on pulse overlapping factor for surface roughness.

scholarly journals Experimental Study of Back Wall Dross and Surface Roughness in Fiber Laser Microcutting of 316L Miniature Tubes

Micromachines ◽  
2017 ◽  
Vol 9 (1) ◽  
pp. 4 ◽  
Author(s):  
Erika García-López ◽  
Alexis Medrano-Tellez ◽  
Juansethi Ibarra-Medina ◽  
Hector Siller ◽  
Ciro Rodriguez
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Fiber Laser ◽  
Back Wall

An Experimental Investigation of the Laser Milling Process for Polycrystalline Diamonds

2011 ◽  
Vol 291-294 ◽  
pp. 810-815 ◽  
Author(s):  
Qi Wu ◽  
Jun Wang
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
Polycrystalline Diamond ◽  
Milling Process ◽  
Depth Of Cut ◽  
Good Surface ◽  
Laser Milling ◽  
Cavity Profile ◽  
Profile Depth ◽  
Good Surface Finish

An experimental study of the pulsed laser milling process for a sintered polycrystalline diamond is presented. The characteristics and quality of the cavities machined with a Yd laser under different pulse energies, pulse overlaps, scan overlaps and numbers of passes are discussed, together with the effects of these parameters on the cavity profile, depth of cut and surface roughness. A statistical analysis is also presented to study the relationship between the process parameters and surface roughness. It shows that the optimum pulse overlap and pulse energy may be used to achieve good surface finish, whereas scan overlap and number of passes can be selected to improve the depth of cut without much effect on the surface finish.

Research on Surface Roughness of Die Steel in Micro-Etching

2013 ◽  
Vol 785-786 ◽  
pp. 896-900
Author(s):  
Hong Guang Huang ◽  
Guan Wang ◽  
Zhong Ning Guo ◽  
Qing Song ◽  
Yu Deng
Keyword(s):  
Surface Roughness ◽  
Laser Scanning ◽  
Etching Time ◽  
Micro Channel ◽  
Die Steel ◽  
Etching Method ◽  
Etching Factor ◽  
Relationship Of ◽  
The Relationship

In this study, the 300 µm width micro-channel was manufactured by spray etching method. The surface roughness was analyzed by Laser scanning con-focal microscope. The relationship of the surface roughness and etching factor such as spray etching pressure, mask gap and time had been studied. The results show that the surface roughness increases initially, and then reduces with the size of mask gap. While the roughness increases as the spraying pressure increases. The etching time plays slightly effect on roughness for it has no impact on the etch uniformity as mask gap and spray pressure do.

Cutting Performance of Fiber Laser Textured Tools in Face Milling of Titanium Alloys

2017 ◽  
Vol 1142 ◽  
pp. 250-253
Author(s):  
Ze WU ◽  
You Qiang Xing ◽  
Peng Huang
Keyword(s):  
Surface Roughness ◽  
Titanium Alloys ◽  
Fiber Laser ◽  
Cutting Forces ◽  
Flank Wear ◽  
Cutting Temperature ◽  
Face Milling ◽  
Laser Machining ◽  
Dry Milling ◽  
Temperature Surface

Textured self-lubricating tools were fabricated by fiber laser machining. Dry milling of titanium alloys was carried out with these textured tools and conventional one for comparison. The cutting forces, cutting temperature, surface roughness of processed workpiece and tool flank wear were measured. Results show that the textured tools can reduce the cutting forces, cutting temperature and surface roughness of workpiece, as a result, present superior wear-resistance compared to the untextured tool.

Experimental investigations of nanosecond-pulsed Nd:YAG laser beam micromachining on 304 stainless steel

2018 ◽  
Vol 1 (1) ◽  
pp. 62-75 ◽  
Author(s):  
Rasmi Ranjan Behera ◽  
Mamilla Ravi Sankar ◽  
Prahlad Kumar Baruah ◽  
Ashwini Kumar Sharma ◽  
Alika Khare
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Laser Beam ◽  
Nd:Yag Laser ◽  
Research Work ◽  
Scanning Speed ◽  
304 Stainless Steel ◽  
Experimental Investigations ◽  
Micro Channel ◽  
Micro Channels

The demand for miniaturized components is increasing day by day as their application varies from industry to industry such as biomedical, micro-electro-mechanical system and aerospace. In the present research work, high-quality micro-channels are fabricated on 304 stainless steel by laser beam micromachining process with nanosecond Nd:YAG laser. The laser pulse energy (LPE), scanning speed (SS) and scanning pass number (SP No.) are used as the process parameters, whereas the depth and width of the kerf as well as the surface roughness are used to characterize the micro-channels. It is found that the kerf depth, width and surface roughness decrease with increase in the SS. The kerf depth sharply increases with increase in the SP No. The kerf width is minimum at 30 mJ LPE, 400 µm s‒1 SS and 10 SP No. The minimum surface roughness is observed at 30 mJ LPE, 500 µm s‒1 SS and 10 SP No. The oxygen content is found to gradually decrease with the distance from the centre of the micro-channel. Based on the experimental results, optimized input parameters can be offered to control the micro-channel dimensions and improve their surface finish effectively on stainless steel.

scholarly journals Particle Entrapment in Line Elastohydrodynamic Contacts and the Influence of Intermolecular (van der Waals) Forces

Lubricants ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 60
Author(s):  
George K. Nikas
Keyword(s):  
Surface Roughness ◽  
Parametric Analysis ◽  
Van Der Waals ◽  
Surface Damage ◽  
Intermolecular Force ◽  
Roughness Effects ◽  
Fluid Forces ◽  
Micro Particles ◽  
Particle Entrapment ◽  
Complete Set

A metallic particle passing through concentrated rolling-sliding contacts is often linked to surface damage for particles larger than the available gap. At the instant of particle pinching, force balancing dictates particle entrapment and passing through the contact or rejection. It is vital to include all major forces in this process. This study revisits the analytical entrapment model previously published by the author for spherical micro-particles by incorporating a force so far overlooked in related studies, namely the van der Waals intermolecular force and, additionally, surface roughness effects. In conjunction with particle mechanical and fluid forces, this provides an almost complete set to use for correct force balancing. A parametric analysis shows the effect of several geometrical, mechanical, rheological, and surface parameters on spherical particle entrapment and reveals the significance of the van der Waals force for particles smaller than about 5–10 μm in diameter.

Sign in / Sign up

Export Citation Format

Share Document