Preliminary analysis of the laser polishing process by high-speed thermographic visualization

2020 ◽  
Author(s):  
Jack Beyfuss ◽  
Evgueni V. Bordatchev ◽  
O. Remus Tutunea-Fatan
Keyword(s):  
Preliminary Analysis ◽  
High Speed ◽  
Polishing Process ◽  
Laser Polishing ◽  
Thermographic Visualization

scholarly journals Modeling and Optimization of Laser Polishing Process

2014 ◽  
Vol 575 ◽  
pp. 766-770 ◽  
Author(s):  
Benoit Rosa ◽  
Jean Yves Hascoet ◽  
Pascal Mognol
Keyword(s):  
Laser Power ◽  
Quadratic Model ◽  
Operating Parameters ◽  
Primary Process ◽  
Initial Surface ◽  
Polishing Process ◽  
Laser Polishing ◽  
Finishing Process ◽  
Optimal Set ◽  
Melting Material

Laser polishing is a finishing process based on melting material, with the objective of improving surface topography. Some operating parameters must be taken into consideration, such as laser power, feed rate, offset, and overlapping. Moreover, because of its dependence on the primary process, the initial topography has also an impact on the final result. This study describes a quadratic model, conceived to optimize final topography according to the primary process and laser polishing. Based on an experimental matrix, the model takes into account both laser operating parameters and the initial topography, in order to predict polished surfaces and to determine optimal set of parameters. After the phase of experimentation and the creation of the quadratic model, an optimal final topography is introduced, taking into account the initial surface and the laser parameters.

SURFACE ROUGHNESS OF MAGNESIUM ALLOY AZ91D IN HIGH SPEED MILLING

2016 ◽  
Vol 78 (6-9) ◽  
Author(s):  
Mohd Shahfizal Ruslan ◽  
Kamal Othman ◽  
Jaharah A.Ghani ◽  
Mohd Shahir Kassim ◽  
Che Hassan Che Haron
Keyword(s):  
Surface Roughness ◽  
Magnesium Alloy ◽  
Feed Rate ◽  
High Speed ◽  
Cutting Parameters ◽  
Experimental Result ◽  
Depth Of Cut ◽  
Polishing Process ◽  
High Speed Cutting ◽  
Radial Depth

Magnesium alloy is a material with a high strength to weight ratio and is suitable for various applications such as in automotive, aerospace, electronics, industrial, biomedical and sports. Most end products require a mirror-like finish, therefore, this paper will present how a mirror-like finishing can be achieved using a high speed face milling that is equivalent to the manual polishing process. The high speed cutting regime for magnesium alloy was studied at the range of 900-1400 m/min, and the feed rate for finishing at 0.03-0.09 mm/tooth. The surface roughness found for this range of cutting parameters were between 0.061-0.133 µm, which is less than the 0.5µm that can be obtained by manual polishing. Furthermore, from the S/N ratio plots, the optimum cutting condition for the surface roughness can be achieved at a cutting speed of 1100 m/min, feed rate 0.03 mm/tooth, axial depth of cut of 0.20 mm and radial depth of cut of 10 mm. From the experimental result the lowest surface roughness of 0.061µm was obtained at 900 m/min with the same conditions for other cutting parameters. This study revealed that by milling AZ91D at a high speed cutting, it is possible to eliminate the polishing process to achieve a mirror-like finishing.

scholarly journals High Speed UV Photometry of the AM Her Systems AM Her, VV Pup And V834 Cen, with the Hubble Space Telescope

1996 ◽  
Vol 158 ◽  
pp. 223-224
Author(s):  
K. Schaefer ◽  
H. Bond ◽  
G. Chanmugam
Keyword(s):  
Preliminary Analysis ◽  
High Speed ◽  
Hubble Space Telescope ◽  
Cataclysmic Variables ◽  
Low Frequency ◽  
Gabor Transform ◽  
Periodic Oscillations ◽  
Space Telescope ◽  
Uv Photometry ◽  
Magnetic Cataclysmic Variables

We have used the High Speed Photometer (HSP) aboard the Hubble Space Telescope to observe the magnetic cataclysmic variables VV Pup, AM Her, and V834 Cen in the UV (1400…3300 Å) with 0.01 s time resolution. We detected low frequency flickering in all three systems, and compare the time-scales with the predictions of King (1989). At higher frequencies we searched for shock oscillations from the accretion column(s) in these systems. The data were analyzed using the Gabor transform wavelet-like technique (Heil & Walnut 1989) to search for frequency evolution throughout each observation. Preliminary analysis suggests the detection of rapid UV quasi-periodic oscillations (QPOs) in VV Pup at 0.74 Hz, and at 4.4 Hz in V834 Cen. As in ground based observations, our observations failed to yield any rapid QPOs in AM Her itself.

scholarly journals Automated laser polishing for surface finish enhancement of additive manufactured components for the automotive industry

2020 ◽  
Author(s):  
Alessandra Caggiano ◽  
Roberto Teti ◽  
Vittorio Alfieri ◽  
Fabrizia Caiazzo
Keyword(s):  
Surface Finish ◽  
Automotive Industry ◽  
Surface Characterization ◽  
Precipitation Hardening ◽  
Microstructural Analysis ◽  
Polished Surface ◽  
Automatic Identification ◽  
Process Conditions ◽  
Polishing Process ◽  
Laser Polishing

AbstractAdditive manufactured components require polishing to improve their inherently rough surface finish. In this work, an innovative laser polishing process based on wobbling of the laser beam is proposed for surface finish enhancement of additive manufactured parts made of Cr–Cu precipitation hardening steel, widely employed for mechanical components in the automotive industry. Parts were fabricated by selective laser melting and subjected to the innovative laser polishing under different process conditions. Surface characterization was performed by microstructural analysis and surface roughness measurement. Machine learning-based CNN processing of polished surface images was employed for automatic identification of optimal LP condition.

Hybrid CO2 laser-polishing process for improving material removal of silicon carbide

2020 ◽  
Vol 106 (7-8) ◽  
pp. 3139-3151 ◽  
Author(s):  
Mincheol Kim ◽  
Sangmin Bang ◽  
Dong-Hyeon Kim ◽  
Hyun-Taek Lee ◽  
Geon-Hee Kim ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Co2 Laser ◽  
Material Removal ◽  
Polishing Process ◽  
Laser Polishing

The Influence of Acoustic Cavitation to Microscopic Material Removal in Polishing Process Based on Vibration of Liquid: A Numerical Study

2006 ◽  
Vol 532-533 ◽  
pp. 301-304 ◽  
Author(s):  
Zhong Ning Guo ◽  
Zhi Gang Huang ◽  
Xin Chen
Keyword(s):  
Material Removal ◽  
High Speed ◽  
Bubble Dynamics ◽  
Numerical Study ◽  
Dissipative Particle Dynamics ◽  
Thermal Conditions ◽  
Acoustic Cavitation ◽  
Ultrasonic Frequency ◽  
Polishing Process ◽  
Cavitation Phenomenon

In Polishing Process based on Vibration of Liquid (PVL), abrasive particles driven by polishing liquid will brush and etch workpiece to achieve material removal. Because the liquid is vibrated in ultrasonic frequency, polishing process will be greatly affected by cavitation phenomenon. The critical thermal conditions and high-speed liquid jet produced by bubble dynamics may damage workpiece. A refined Dissipative Particle Dynamics method is applied to study the effect of acoustic cavitation on PVL. Validity of the numerical simulation is tested according to experimental results.

Development of the Polishing System for High-Speed & High-Pressure Polishing Process

2016 ◽  
Vol 2016 (0) ◽  
pp. S1630102
Author(s):  
Tadakazu MIYASHITA ◽  
Kiyoshi SESHIMO ◽  
Tsutomu YAMAZAKI ◽  
Atsushi KAJIKURA ◽  
Daizo ICHIKAWA ◽  
...  
Keyword(s):  
High Pressure ◽  
High Speed ◽  
Polishing Process

scholarly journals Effect of initial surface topography during laser polishing process: Statistical analysis

2019 ◽  
Vol 34 ◽  
pp. 269-274 ◽  
Author(s):  
Evgueni Bordatchev ◽  
Srdjan Cvijanovic ◽  
O. Remus Tutunea-Fatan
Keyword(s):  
Statistical Analysis ◽  
Surface Topography ◽  
Initial Surface ◽  
Polishing Process ◽  
Laser Polishing
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