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

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.

EFFECT OF SURFACE TOPOGRAPHY ON SEISMIC MAPPING

Geophysics ◽  
1946 ◽  
Vol 11 (3) ◽  
pp. 362-372 ◽  
Author(s):  
M. B. Widess
Keyword(s):  
Statistical Analysis ◽  
Surface Topography ◽  
Rough Surface ◽  
Computational Methods ◽  
Surface Relief ◽  
Lateral Variations ◽  
Source Of Error ◽  
Gathering Data ◽  
Effect Of Surface ◽  
Approximate Magnitude

The presence of rough surface topography in a prospect frequently constitutes a source of error in seismic mapping and poses the question of what computational methods can be applied by which seismic maps may be freed of the effect of surface relief. Various aspects of the problem are described. The use of a plane datum‐horizon is generally adequate as a solution of the problem. For greater refinement, the structural map may be modified to account for the overburden effect, the approximate magnitude of which is considered. Further modification may be required when lateral variations in subweathering velocity occur. Statistical analysis for determining the degree of conformity between surface topography and mapped structure at depth is useful in gathering data on the influence of surface topography.

Control of Polysilicon Surface Topography in a High Selectivity Chemical Mechanical Polishing Process

1999 ◽  
Vol 146 (3) ◽  
pp. 1158-1162 ◽  
Author(s):  
Simon J. Fang ◽  
Vladimir A. Ukraintsev ◽  
Elisa U ◽  
Hal Edwards ◽  
Scott Steckenrider
Keyword(s):  
Surface Topography ◽  
Chemical Mechanical Polishing ◽  
High Selectivity ◽  
Mechanical Polishing ◽  
Polishing Process ◽  
Chemical Mechanical Polishing Process

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.

scholarly journals Laser Polishing of Additive Manufactured Aluminium Parts by Modulated Laser Power

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1332
Author(s):  
Markus Hofele ◽  
André Roth ◽  
Jochen Schanz ◽  
Johannes Neuer ◽  
David K. Harrison ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Energy Density ◽  
Laser Power ◽  
Modulation Frequency ◽  
Reduction Rate ◽  
Initial Surface ◽  
Process Stability ◽  
Laser Polishing ◽  
Melt Pool ◽  
Power Curves

In this study a new approach to laser polishing with periodic modulated laser power in the kilohertz regime is introduced. By varying the modulation frequency and modulation time, different periodic laser power curves with varying minimum, peak and average laser power can be created. The feasibility of the method is shown by polishing of vertical built AlSi10Mg L-PBF parts with an initial roughness of Ra = 12.22 µm. One polishing pass revealed a decreasing surface roughness with increasing energy density on the surface up to Ra = 0.145 µm. An increasing energy density results in a rising remelting depth between 50 and 255 µm and a rising relative porosity of 0.3% to 4.6%. Furthermore, the thermal process stability, analysed by the melt pool length in scanning direction, reveals a steadily increasing melt pool dimension due to component heating. Multiple laser polishing passes offers a further reduced surface roughness, especially at higher modulation frequencies and provides an improved orientation independent roughness homogeneity. The process stability regarding varying initial surface roughness revealed an almost constant relative roughness reduction rate with an achievable roughness variation after two polishing passes between Ra = 0.13–0.26 µm from an initial state of Ra = 8.0−19.2 µm.

Model establishment of surface roughness and experimental investigation on magnetorheological finishing for polishing the internal surface of titanium alloy tubes

2020 ◽  
pp. 1045389X2093009
Author(s):  
Zhen Peng ◽  
Wan-Li Song ◽  
Cui-Li Ye ◽  
Pei Shi ◽  
Seung-Bok Choi
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Internal Surface ◽  
Initial Surface ◽  
Polishing Process ◽  
Indentation Force ◽  
Rotation Motion ◽  
Surface Precision ◽  
Polishing Tool ◽  
Magnetorheological Polishing

A novel magnetorheological polishing process is devised to polish the internal surface of titanium alloy tubes. Under the magnetic field in polishing area between the internal surface of tube and polishing head, magnetorheological polishing fluid gets stiffened and acts as the polishing tool. In this process, rotation motion of tube and reciprocating linear motion of polishing head are carried out simultaneously resulting in helical motion trajectory of abrasive particles on workpiece surface. The finishing forces during magnetorheological polishing process including normal indentation force and shear force are analyzed and modeled. Based on the proposed model, final surface roughness Ra model is proposed to predict the polishing performance. Experiments are carried out to investigate the effect of polishing time and initial surface roughness Ra on polishing performance. The experimental results are compared with the model results, which are highly consistent. The results show a gradual growth of surface precision with polishing time and an augment of polishing efficiency with increasing initial surface roughness Ra.

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
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