scholarly journals New vibration-assisted magnetic abrasive polishing (VAMAP) method for microstructured surface finishing

2016 ◽  
Vol 24 (12) ◽  
pp. 13542 ◽  
Author(s):  
Jiang Guo ◽  
Chun Wai Kum ◽  
Ka Hing Au ◽  
Zhi’En Eddie Tan ◽  
Hu Wu ◽  
...  
Keyword(s):  
Surface Finishing ◽  
Microstructured Surface ◽  
Magnetic Abrasive Polishing

Novel rotating-vibrating magnetic abrasive polishing method for double-layered internal surface finishing

2019 ◽  
Vol 264 ◽  
pp. 422-437 ◽  
Author(s):  
Jiang Guo ◽  
Ka Hing Au ◽  
Chen-Nan Sun ◽  
Min Hao Goh ◽  
Chun Wai Kum ◽  
...  
Keyword(s):  
Internal Surface ◽  
Surface Finishing ◽  
Magnetic Abrasive Polishing

Internal surface finishing

2018 ◽  
Author(s):  
JIANG GUO
Keyword(s):  
Internal Surface ◽  
Surface Finishing

This entry introduces five kinds of established internal surface finishing technologies.

Surface finishing of enamels by sol-gel coating

2006 ◽  
Vol 41 (1) ◽  
pp. 99-102 ◽  
Author(s):  
Marta Krzyzak ◽  
Günther Heinz Frischat ◽  
Peter Hellmold
Keyword(s):  
Sol Gel ◽  
Surface Finishing

Random impact FEM simulation of irregularly-shaped media for parametric study of vibratory surface enhancement

2021 ◽  
pp. 095440542199012
Author(s):  
Jing Zhang ◽  
Joselito Yam Alcaraz ◽  
Swee-Hock Yeo ◽  
Arun Prasanth Nagalingam ◽  
Abhay Gopinath
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Parametric Study ◽  
Thermal Loading ◽  
Low Cycle Fatigue ◽  
Fem Simulation ◽  
Surface Finishing ◽  
Aerospace Materials ◽  
Surface Enhancement ◽  
Steel Balls

Aerospace materials experience high levels of mechanical and thermal loading, high/low cycle fatigue, and damage from foreign objects during service, which can lead to premature retirement. Mechanical surface treatments of metallic components, for example, fan blades and blisks, are proven to improve fatigue life, improve wear resistance and avoid stress corrosion by introducing work hardening, compressive residual stresses of sub-surface, and surface finishing. Vibropeening can enhance aerospace materials’ fatigue life involving the kinetic agitation of hardened steel media in a vibratory finishing machine that induces compressive stresses into the component sub-layers while keeping a finished surface. Spherical steel balls are the most widely used shape among steel-based media and have been explored for decades. However, they are not always versatile, which cannot access deep grooves, sharp corners, and intricate profiles. Steel ballcones or satellites, when mixed with round steel balls and other steel media (diagonals, pins, eclipses, cones), works very well in such areas that ball-shaped media are unable to reach. However, a methodology of study the effect of irregularly-shaped media in surface enhancement processes has not been established. This paper proposes a finite element-based model to present a methodology for the parametric study of vibratory surface enhancement with irregularly-shaped media and investigates residual stress profiles within a treated area of an Inconel component. The methodology is discussed in detail, which involves a stochastic simulation of orientation, impact force, and impact location. The contrasting effects of a high aspect ratio, or an edge contact, as opposed to rounded and oblique contacts are demonstrated, with further analysis on the superposition of these effects. Finally, the simulation results are compared with actual residual stress measurements and was found to have a max percent difference of 34% up to 20 [Formula: see text]m below the media surface.

scholarly journals Numerical Simulation of Effect of Different Initial Morphologies on Melt Hydrodynamics in Laser Polishing of Ti6Al4V

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 581
Author(s):  
Kai Li ◽  
Zhenyu Zhao ◽  
Houming Zhou ◽  
Hao Zhou ◽  
Jie Yin ◽  
...  
Keyword(s):  
Flow Behavior ◽  
Processing Parameters ◽  
Surface Finishing ◽  
Polished Surface ◽  
Laser Polishing ◽  
Starting Position ◽  
Double Spiral ◽  
The Difference ◽  
Thermocapillary Forces ◽  
Surface Morphologies

As a surface finishing technique for rapid remelting and re-solidification, laser polishing can effectively eliminate the asperities so as to approach the feature size. Nevertheless, the polished surface quality is significantly sensitive to the processing parameters, especially with respect to melt hydrodynamics. In this paper, a transient two-dimensional model was developed to demonstrate the molten flow behavior for different surface morphologies of the Ti6Al4V alloy. It is illustrated that the complex evolution of the melt hydrodynamics involving heat conduction, thermal convection, thermal radiation, melting and solidification during laser polishing. Results show that the uniformity of the distribution of surface peaks and valleys can improve the molten flow stability and obtain better smoothing effect. The high cooling rate of the molten pool resulting in a shortening of the molten lifetime, which prevents the peaks from being removed by capillary and thermocapillary forces. It is revealed that the mechanism of secondary roughness formation on polished surface. Moreover, the double spiral nest Marangoni convection extrudes the molten to the outsides. It results in the formation of expansion and depression, corresponding to nearby the starting position and at the edges of the polished surface. It is further found that the difference between the simulation and experimental depression depths is only about 2 μm. Correspondingly, the errors are approximately 8.3%, 14.3% and 13.3%, corresponding to Models 1, 2 and 3, respectively. The aforementioned results illustrated that the predicted surface profiles agree reasonably well with the experimentally measured surface height data.

scholarly journals Titanium anodizing in a choline dihydrogencitrate salt–oxalic acid deep eutectic solvent: a step towards green chemistry in surface finishing of titanium and its alloys

RSC Advances ◽  
2021 ◽  
Vol 11 (34) ◽  
pp. 21104-21115
Author(s):  
Juliusz Winiarski ◽  
Anna Niciejewska ◽  
Monika Górnik ◽  
Jakub Jakubowski ◽  
Włodzimierz Tylus ◽  
...  
Keyword(s):  
Green Chemistry ◽  
Oxalic Acid ◽  
Deep Eutectic Solvent ◽  
Surface Finishing

Fabrication of nanometric color TiO2 layers through polarization of titanium in a choline dihydrogencitrate–oxalic acid DES anodizing bath.

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