Influence of machining conditions on tool wear and surface characteristics in hot turning of AISI630 steel

2021 ◽  
Author(s):  
Seyed Mohammad Ebrahimi ◽  
Mohammadjafar Hadad ◽  
Alireza Araee ◽  
Seyed Hamid Ebrahimi
Keyword(s):  
Tool Wear ◽  
Surface Characteristics ◽  
Machining Conditions ◽  
Hot Turning

scholarly journals Simulation and Experimental Study on the Surface Generation Mechanism of Cu Alloys in Ultra-Precision Diamond Turning

Micromachines ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 573
Author(s):  
Zhang ◽  
Guo ◽  
Chen ◽  
Fu ◽  
Zhao
Keyword(s):  
Tool Wear ◽  
Diamond Tool ◽  
Surface Characteristics ◽  
Diamond Turning ◽  
Generation Mechanism ◽  
Surface Generation ◽  
Machining Parameters ◽  
Nose Radius ◽  
Cu Alloys ◽  
Ultra Precision

The surface generation mechanism of the Cu alloys in ultra-precision diamond turning is investigated by both simulation and experimental methods, where the effects of the cutting parameters on the surface characteristics are explored, including the workpiece spindle speed, the cutting depth, the feed rate and the nose radius of the diamond tool. To verify the built model, the cutting experiments are conducted at selected parameters, where the causes of the error between the simulation and the machining results are analyzed, including the effects of the materials microstructure and the diamond tool wear. In addition, the nanometric surface characteristics of the Cu alloys after the diamond turning are identified, including the finer scratching grooves caused by the tool wear, the formation of the surface burs and the adhesion of graphite. The results show that the built model can be basically used to predict the surface topography for the selection of the appropriate machining parameters in the ultra-precision diamond turning process.

Surface characteristics and machining performance of TiAlN-, TiN- and AlCrN-coated tungsten carbide drills

2018 ◽  
Vol 233 (4) ◽  
pp. 1075-1086 ◽  
Author(s):  
Chaiya Dumkum ◽  
Pakin Jaritngam ◽  
Viboon Tangwarodomnukun
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Tungsten Carbide ◽  
Thrust Force ◽  
Surface Characteristics ◽  
Average Error ◽  
Force Model ◽  
Machining Performance ◽  
Coating Materials ◽  
Drilling Performance

This article presents a comprehensive analysis of surface characteristics and drilling performance of uncoated and coated tungsten carbide drills. The single- and double-layer coatings of TiN, TiAlN and AlCrN were examined in terms of surface roughness, microhardness and crack resistance. In addition, drilling torque and thrust force were experimentally measured and compared to the developed models based on the drilling mechanics and drill geometries. Tool wear and hole surface roughness were also considered to assess the machining performance of different coated tools. The results revealed that all coated drills can offer better cut surface quality, 28% lower cutting loads and longer tool life than the uncoated drills. Although AlCrN was found to be the hardest coating material among the others, it caused large wear on the cutting edges and poor surface roughness of produced holes. The lowest torque and thrust force were achievable using TiN-coated drill, while the use of TiAlN coating resulted in the lowest surface roughness and smallest tool wear. Furthermore, the drilling torque and thrust force model developed in this study were found to correspond to the experimental measures with the average error of 8.4%. The findings of this work could facilitate the selection of coating materials to advance the machining performance.

Machinability of Pearlitic Cast Iron With Cubic Boron Nitride (CBN) Cutting Tools

2002 ◽  
Vol 124 (4) ◽  
pp. 820-832 ◽  
Author(s):  
Jiancheng Liu ◽  
Kazuo Yamazaki ◽  
Hiroyuki Ueda ◽  
Norihiko Narutaki ◽  
Yasuo Yamane
Keyword(s):  
Cast Iron ◽  
Boron Nitride ◽  
Tool Wear ◽  
High Speed ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Machining Conditions ◽  
Machining Center

In order to increase the accurate finishing productivity of pearlitic cast iron, face milling by CBN (Cubic Boron Nitride) cutting tools was studied. The main focus of the study is the machinability investigation of pearlitic cast iron with CBN cutting tools by studying the relationships among machining conditions such as feed rate, cutting speed as well as CBN cutting tool type, tool wear, workpiece surface quality, cutting forces, and cutting temperature. In addition, an emphasis is put on the effect of Al additive in pearlitic cast iron on its machinability and tool wear characteristics. High-speed milling experiments with CBN cutting tools were conducted on a vertical machining center under different machining conditions. The results obtained provide a useful understanding of milling performance by CBN cutting tools.

Study the Effects of Dielectric Type on the Machining Characteristics of γ-Ti Al in Electrical Discharge Machining

2017 ◽  
Vol 33 ◽  
pp. 40-49
Author(s):  
Mohammad Reza Shabgard ◽  
Hossein Faraji ◽  
Behnam Khosrozade ◽  
Hadi Eivazi-Bagheri ◽  
Keivan Amini
Keyword(s):  
Intermetallic Compound ◽  
Tool Wear ◽  
Electric Discharge ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Surface Characteristics ◽  
Deionized Water ◽  
Surface Cracks ◽  
Electric Discharge Machining ◽  
Tool Wear Ratio

The current study surveys the results of using deionized water and kerosene as dielectrics in the machining outputs of γ-TiAl intermetallic compound obtained in electric discharge machining. Influences of these different dielectrics properties on machining speed, tool wear, surface cracks and roughness were compared. Scanning electron microscopy micrographs were prepared to investigate influences of dielectrics on the surface characteristics of electrically discharged samples. Results indicate which by kerosene dielectric; the material removal rate (MRR) is further compared to another one. But deionized water as dielectric causes higher tool wear ratio than kerosene dielectric. Electrical discharged samples in deionized water have higher surface roughness, in addition it contains surface cracks, whereas kerosene dielectric results better surface finish in low pulse current. According to XRD spectra electric discharge machining in deionized water and kerosene dielectrics produces Ti3 Al intermetallic compound on the produced surface.

Heat and Temperatures in Machining: Effects and Significance

2012 ◽  
Vol 622-623 ◽  
pp. 1550-1553
Author(s):  
Rajesh Patil ◽  
Vilas Kalamkar ◽  
Hari Vasudevan
Keyword(s):  
Tool Wear ◽  
High Speed ◽  
Surface Characteristics ◽  
Contact Length ◽  
Machined Surface ◽  
Temperature Changes ◽  
Economic Problems ◽  
Highly Sensitive ◽  
Tool Wear Mechanisms ◽  
Finish Hard Turning

Heat generated in machining is significant to study, as number of technical and economic problems has root into it. The high temperatures on cutting tool needs better understanding of contact processes at tool-chip ,tool-workpiece interfaces. The contact length at tool-chip interface is significant to study as it governs the heat moving to the tool as well as many tribological conditions like stresses, tool wear. Understanding of Tool-workpiece interface is significant as it affects the heat moving to workpiece, tool, chip as well as tool flank wear and major machined surface characteristics. Non-sliding type tool wear mechanisms which are highly sensitive to temperature changes are important to study. The latest trends of using High Speed Machining, Dry and Near Dry Machining, Finish hard turning results in more heat generation demanding significant understanding of effect of heat generated and temperatures.

Multi-Parameter Modeling of Surface Texture in EDMachining Using the Design of Experiments Methodology

2006 ◽  
Vol 526 ◽  
pp. 157-162 ◽  
Author(s):  
G. Petropoulos ◽  
N. Vaxevanidis ◽  
A. Iakovou ◽  
Kostas David
Keyword(s):  
Design Of Experiments ◽  
Surface Texture ◽  
Pulse Current ◽  
Surface Characteristics ◽  
Close Correlation ◽  
Functional Surface ◽  
Machining Conditions ◽  
Texture Model ◽  
Aisi D2 ◽  
Pulse On Time

This study concerns the formulation of a multi-parameter surface texture model in EDMachining of AISI D2 tool steel. The model is developed in terms of pulse current and pulse-on time which are the dominant machining conditions, via factorial design of experiments. By applying analysis of variance and statistical multi-regression analysis to the experimental data close correlation is proved between certain surface finish parameters and the machining conditions, with pulse current exerting the strongest influence. By applying this model the appropriate conditions for successful finish can be selected, as well as functional surface characteristics can be quantified.

A Study on the Surface Characteristics with the Vibration Factor in the Micro-Machine

2006 ◽  
Vol 321-323 ◽  
pp. 1605-1608
Author(s):  
Jong Min Kin ◽  
Min Sung Hong ◽  
Bong Suk Kim ◽  
Soo Hun Lee
Keyword(s):  
Great Influence ◽  
Cutting Speed ◽  
Surface Characteristics ◽  
Surface Shape ◽  
System Stability ◽  
Micro Milling ◽  
Machining Parameters ◽  
Machining Conditions ◽  
The Difference ◽  
Micro Machine

In conventional machining, cutting conditions such as cutting speed, feed rate, and depth of the cut have great influence on the surface roughness. In micro machining, however, the surface shape is affected by not only the machining parameters mentioned earlier but also tool stiffness, system stability, and workpiece properties caused by the miniatured structure and cutting tool. Especially, in a micro-machine system, the difference between the cutting forces in the recursive cuts introduces the vibration easily. A high spindle causes instability of the system, increases the temperature in the cutting process, and also changes the tool’s shape. This study introduces a method to predict the surface shape of the workpiece based on the machining conditions in micro milling. The micro-milled surfaces in different machining conditions are predicted by a computer simulation including the vibration model and the simulated results show good agreement with the experimental results.

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