The effects of laser machining parameters on roughness and contact angle for boron carbide ceramic surface

2021 ◽  
Vol 52 (12) ◽  
pp. 1382-1393
Author(s):  
T. Canel ◽  
F. Gölbaşi ◽  
Z. Gezer
Keyword(s):  
Contact Angle ◽  
Boron Carbide ◽  
Laser Machining ◽  
Machining Parameters ◽  
Ceramic Surface

scholarly journals Fast Analytic Simulation for Multi-Laser Heating of Sheet Metal in GPU

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2078 ◽  
Author(s):  
Daniel Mejia-Parra ◽  
Diego Montoya-Zapata ◽  
Ander Arbelaiz ◽  
Aitor Moreno ◽  
Jorge Posada ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Heat Transfer Analysis ◽  
Laser Beams ◽  
Temperature History ◽  
Laser Machining ◽  
Transient Temperature ◽  
Interactive Simulation ◽  
Machining Parameters ◽  
Time Space ◽  
Time Frames

Interactive multi-beam laser machining simulation is crucial in the context of tool path planning and optimization of laser machining parameters. Current simulation approaches for heat transfer analysis (1) rely on numerical Finite Element methods (or any of its variants), non-suitable for interactive applications; and (2) require the multiple laser beams to be completely synchronized in trajectories, parameters and time frames. To overcome this limitation, this manuscript presents an algorithm for interactive simulation of the transient temperature field on the sheet metal. Contrary to standard numerical methods, our algorithm is based on an analytic solution in the frequency domain, allowing arbitrary time/space discretizations without loss of precision and non-monotonic retrieval of the temperature history. In addition, the method allows complete asynchronous laser beams with independent trajectories, parameters and time frames. Our implementation in a GPU device allows simulations at interactive rates even for a large amount of simultaneous laser beams. The presented method is already integrated into an interactive simulation environment for sheet cutting. Ongoing work addresses thermal stress coupling and laser ablation.

THEORETICAL ANALYSES FOR LASER MACHINING MICROCHANNELS AND DEMONSTRATION OF THEIR USES IN MANUFACTURE OF A MICROFLUIDIC OPTICAL SWITCH

2006 ◽  
Vol 13 (06) ◽  
pp. 795-802 ◽  
Author(s):  
DANIEL LIM ◽  
ERNA GONDO SANTOSO ◽  
KIM MING TEH ◽  
STEPHEN WAN ◽  
H. Y. ZHENG
Keyword(s):  
Fluid Flow ◽  
Optical Switch ◽  
Low Cost ◽  
Microfluidic Devices ◽  
Cost Effective ◽  
Laser Machining ◽  
Machining Parameters ◽  
Flow Channels ◽  
Cost Effective Method ◽  
Theoretical Analyses

Silicon has been widely used to fabricate microfluidic devices due to the dominance of silicon microfabrication technologies available. In this paper, theoretical analyses are carried out to suggest suitable laser machining parameters to achieve required channel geometries. Based on the analyses, a low-power CO 2 laser was employed to create microchannels in Acrylic substrate for the use of manufacturing an optical bubble switch. The developed equations are found useful for selecting appropriate machining parameters. The ability to use a low-cost CO 2 laser to fabricate microchannels provides an alternative and cost-effective method for prototyping fluid flow channels, chambers and cavities in microfluidic lab chips.

Application of Indentation Method for Quality Control of Processing of Ceramic Details

2016 ◽  
Vol 827 ◽  
pp. 7-10 ◽  
Author(s):  
Valery V. Kuzin ◽  
Sergey N. Grigoriev ◽  
Sergey Fedorov
Keyword(s):  
Quality Control ◽  
Pulse Laser ◽  
Experimental Studies ◽  
Laser Machining ◽  
Ceramic Surface ◽  
Local Fracture ◽  
Indentation Method ◽  
Fracture Formation ◽  
Fracture Area ◽  
Parts Manufacturing

This paper describes approaches developed for the using of indentation method for evaluating the effectiveness of traditional and innovative kinds of ceramic parts manufacturing. Experimental studies revealed relationship between conditions of the grinding and pulse laser machining with the number and length of cracks, as well as local fracture area during indentation. Essential impact of regimes of these technological processes on the nature of cracks and local fracture formation during indentation of oxide-carbide ceramic surface was disclosed. The analysis of effectiveness of different methods of forming the surface of ceramic parts using the revealed effects was done.

An intelligent approach to optimize the electrical discharge machining of titanium alloy by simple optimization algorithm

2020 ◽  
pp. 095440892096468
Author(s):  
Anshuman Kumar Sahu ◽  
Joji Thomas ◽  
Siba Sankar Mahapatra
Keyword(s):  
Titanium Alloy ◽  
Boron Carbide ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Optimal Solution ◽  
Machining Parameters ◽  
Machining Performance ◽  
Intelligent Approach ◽  
Pulse On Time

Electrical discharge machining (EDM) is a thermo-electrical process that can be conveniently utilized for generating complex shaped profiles on hard-to-machine conductive materials using metallic tool electrodes. In this work, composite tools made of copper-tungsten-boron carbide (Cu-W-B4C) manufactured by powder metallurgy (PM) route are used during machining of titanium alloy (Ti6Al4V). The effect of four input machining parameters viz. current, pulse-on-time, duty cycle and percentage of tungsten and boron carbide on material removal rate (MRR), tool wear rate (TWR) and surface roughness (Ra) is studied. A novel meta-heuristic approach such as simple optimization (SOPT) algorithm has been used for single and multi-objective optimization. The pareto-optimal solutions obtained by SOPT have been ranked by VIKOR method to find out the best suitable optimal solution. Analysis of experimental data suggests vital information for controlling the machining parameters to improve the machining performance.

scholarly journals Influence of Sandblasting Particle Size and Pressure on Resin Bonding Durability to Zirconia: A Residual Stress Study

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5629
Author(s):  
Sung-Min Kwon ◽  
Bong Ki Min ◽  
Young Kyung Kim ◽  
Tae-Yub Kwon
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Contact Angle ◽  
Particle Size ◽  
Residual Stresses ◽  
Zirconia Ceramic ◽  
Ceramic Surface ◽  
M Phase ◽  
Bonding Durability ◽  
Resin Bonding

The influence of residual stress induced by sandblasting the zirconia ceramic surface on the resin bonding to the ceramic is still unclear. The effect of four different sandblasting conditions (with 50 and 110 μm alumina at pressures of 0.2 and 0.4 MPa) on the bonding of adhesive resin cement (Panavia F 2.0) to zirconia (Cercon® ht) was investigated in terms of residual stress. The surface roughness and water contact angle of the zirconia surfaces were measured. The tetragonal-to-monoclinic (t–m) phase transformation and residual stresses (sin2ψ method) were studied by X-ray diffraction. The resin-bonded zirconia specimens were subjected to shear bond strength (SBS) tests before and after thermocycling (10,000 and 30,000 cycles) (n = 10). As the particle size and pressure increased, the roughness gradually and significantly increased (p = 0.023). However, there were no significant differences in roughness-corrected contact angle among all the sandblasted groups (p > 0.05). As the particle size and pressure increased, the m-phase/(t-phase + m-phase) ratios and compressive residual stresses gradually increased. After thermocycling, there were no significant differences in SBS among the sandblasted zirconia groups (p > 0.05). In conclusion, increased surface roughness and residual stress do not directly affect the resin bonding durability.

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