scholarly journals A Study on Work Hardening in the Laser-Assisted Machining of Si3N4 Ceramics under Different Material Removal Modes

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 432
Author(s):  
Yezhuang Pu ◽  
Yugang Zhao ◽  
Guoyong Zhao ◽  
Jianbing Meng ◽  
Haiyun Zhang ◽  
...  
Keyword(s):  
Work Hardening ◽  
Laser Power ◽  
Material Removal ◽  
Single Factor ◽  
Cutting Depth ◽  
Laser Assisted Machining ◽  
Cutting Deformation ◽  
Si3n4 Ceramics

In order to understand the work hardening phenomenon and mechanism of laser-assisted machining (LAM) of Si3N4 ceramics, the work hardening degree of LAM Si3N4 under different material removal modes was studied. Two sets of single-factor experiments were performed in which the laser power and the cutting depth were changed respectively. The results show that work hardening is the result of the combination of heat and cutting deformation during cutting. The work hardening degree decreases with the increase of material softening degree. When the material is removed plastically, the work hardening degree is 110–115%.

scholarly journals Process Parameters Optimization Using Taguchi-Based Grey Relational Analysis in Laser-Assisted Machining of Si3N4

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 529
Author(s):  
Yezhuang Pu ◽  
Yugang Zhao ◽  
Jianbing Meng ◽  
Guoyong Zhao ◽  
Haiyun Zhang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Work Hardening ◽  
Laser Power ◽  
Material Removal ◽  
Ceramic Materials ◽  
Machining Parameters ◽  
Cutting Depth ◽  
Relational Analysis ◽  
Material Removal Mode ◽  
Grey Relational

Despite extensive research over the past three decades proving that laser-assisted machining (LAM) is effective for machining ceramic materials, which are affected by many machining parameters, there has been no systematic study of the effects of process parameters on surface quality in LAM ceramic materials. In this paper, the effects and optimization of laser power, spindle speed, feed rate, and cutting depth on surface roughness and work hardening of LAM Si3N4 were systematically studied, using grey relational analysis coupled with the Taguchi method. The results show that the combination of machining parameters determines the material removal mode at the material removal location, and then affects the surface quality. In ductile material removal mode, both the value of surface roughness and work hardening degree are smaller. Decreased surface roughness and work hardening degree can be obtained with smaller cutting depth and higher laser power.

Laser-Assisted Machining of Reaction Sintered Mullite Ceramics

2001 ◽  
Author(s):  
Patrick A. Rebro ◽  
Yung C. Shin ◽  
Frank P. Incropera
Keyword(s):  
Cutting Force ◽  
Laser Heating ◽  
Laser Power ◽  
Material Removal ◽  
Operating Conditions ◽  
Laser Assisted Machining ◽  
Feed Force ◽  
Grinding Tool ◽  
Continuous Chip ◽  
Mullite Ceramics

Abstract The present study focuses on the evaluation of the laser-assisted machining (LAM) of pressureless sintered mullite ceramics. Due to mullite’s low thermal diffusivity and tensile strength, a new method for applying laser power is devised to eliminate cracking and fracture of the workpiece during laser heating. The LAM process is characterized by means of cutting force and surface temperature measurements for a variety of operating conditions. Estimated material removal temperatures and the ratio of the feed force to the main cutting force are used to determine material removal mechanisms and regimes for brittle fracture and semi-continuous and continuous chip formation. Surface roughness and subsurface damage are compared for typical parts produced by LAM and grinding. Tool wear characteristics are investigated for variations in laser power, and hence material removal temperature, during LAM of mullite with carbide tools.

Laser-Assisted Machining of Reaction Sintered Mullite Ceramics

2002 ◽  
Vol 124 (4) ◽  
pp. 875-885 ◽  
Author(s):  
Patrick A. Rebro ◽  
Yung C. Shin ◽  
Frank P. Incropera
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Cutting Force ◽  
Laser Power ◽  
Material Removal ◽  
Subsurface Damage ◽  
Operating Conditions ◽  
Laser Assisted Machining ◽  
Feed Force ◽  
Mullite Ceramics

The present study focuses on the evaluation of the laser-assisted machining (LAM) of pressureless sintered mullite ceramics. Due to mullite’s low thermal diffusivity and tensile strength, a new method for applying laser power is devised to eliminate cracking and fracture of the workpiece during laser heating. The LAM process is characterized in terms of cutting force, surface temperature, chip morphology, tool wear, surface roughness and subsurface damage for a variety of operating conditions. Estimated material removal temperatures and the ratio of the feed force to the main cutting force are used to determine material removal mechanisms and regimes for brittle fracture and semi-continuous and continuous chip formation. Surface roughness and subsurface damage are compared between typical parts produced by LAM and grinding. Tool wear characteristics are investigated for variations in laser power, and hence material removal temperature, during LAM of mullite with carbide tools.

Effects of Cutting Parameters on Residual Stresses in High-Speed Milling of Ti-17

2013 ◽  
Vol 834-836 ◽  
pp. 861-865 ◽  
Author(s):  
Yong Shou Liang ◽  
Jun Xue Ren ◽  
Yuan Feng Luo ◽  
Ding Hua Zhang
Keyword(s):  
Experimental Study ◽  
Residual Stresses ◽  
High Speed ◽  
Experimental Parameter ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Single Factor ◽  
Cutting Depth ◽  
High Speed Milling ◽  
Parameter Ranges

An experimental study was conducted to determine cutting parameters of high-speed milling of Ti-17 according to their effects on residual stresses. First, three groups of single factor experiments were carried out to reveal the effects of cutting parameters on residual stresses. Then sensitivity models were established to evaluate the influence degrees of cutting parameters on residual stresses. After that, three criteria were proposed to determine cutting parameters from experimental parameter ranges. In the experiments, the cutting parameter ranges are recommended as [371.8, 406.8] m/min, [0.363, 0.412] mm and [0, 0.018] mm/z for cutting speed, cutting depth and feed per tooth, respectively.

Effects of Cutting Parameters on the Surface Roughness of Ti6Al4V Titanium Alloys in Side Milling

2011 ◽  
Vol 175 ◽  
pp. 289-293 ◽  
Author(s):  
Hao Liu ◽  
Chong Hu Wu ◽  
Rong De Chen
Keyword(s):  
Surface Roughness ◽  
Titanium Alloys ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Cutting Parameters ◽  
Cutting Depth ◽  
Side Milling ◽  
Milling Parameters ◽  
Fine Grain

Side milling Ti6Al4V titanium alloys with fine grain carbide cutters is carried out. The influences of milling parameters on surface roughness are investigated and also discussed with average cutting thickness, material removal rate and vibration. The results reveal that the surface roughness increases with the increase of average cutting thickness and is primarily governed by the radial cutting depth.

Study of Nanocutting Using Atomic Model

2008 ◽  
Vol 33-37 ◽  
pp. 963-968
Author(s):  
Chun Yi Chu ◽  
Chung Ming Tan ◽  
Yung Chuan Chiou
Keyword(s):  
Molecular Dynamics ◽  
Energy Minimization ◽  
Atomic Scale ◽  
Scale Model ◽  
Atomistic Simulations ◽  
Cutting Depth ◽  
Cutting Deformation ◽  
Simulation Results ◽  
Model Approach

The stress induced in a workpiece under nanocutting are analyzed by an atomic-scale model approach that is based on the energy minimization. Certain aspects of the deformation evolution during the process of nanocutting are addressed. This method needs less computational efforts than traditional molecular dynamics (MD) calculations. The simulation results demonstrate that the microscopic cutting deformation mechanism in the nanocutting process can be regarded as the instability of the crystalline structure in our atomistic simulations and the surface quality of the finished workpiece varies with the cutting depth.

A study on laser assisted machining of Ti10V2Fe3Al alloy with varying laser power

2014 ◽  
Vol 74 (1-4) ◽  
pp. 219-224 ◽  
Author(s):  
R. A. Rahman Rashid ◽  
S. Sun ◽  
S. Palanisamy ◽  
G. Wang ◽  
M. S. Dargusch
Keyword(s):  
Laser Power ◽  
Laser Assisted Machining

Study on Surface Roughness in Ultrasonic Vibration Mill-Grinding Hot-Pressed Silicon Nitride

2012 ◽  
Vol 500 ◽  
pp. 269-274 ◽  
Author(s):  
Guo Chao Qiao ◽  
Ming Zhou ◽  
Ming Wang
Keyword(s):  
Surface Roughness ◽  
Ultrasonic Vibration ◽  
Material Removal ◽  
Machining Parameters ◽  
Cutting Depth ◽  
Abrasive Grain ◽  
Feeding Speed ◽  
Material Removal Mode ◽  
Amplitude Decrease ◽  
Vibration Mill

In order to investigate the influences of machining parameters on surface roughness in ultrasonic vibration mill-grinding, the motion of abrasive grain is analyzed. The analysis indicates that grain and workpiece separate periodically which are beneficial for coolant entering into grinding zone to reduce grinding temperature and grinding force and improve surface quality. Experiments are carried out and detected by SEM and roughmeter, the results indicate that influences of spindle rate, feeding speed, cutting depth and amplitude decrease in turn. Through regression analysis, an empirical formula is obtained. The experiments indicate that material removal mode dominates surface roughness.

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