scholarly journals Recent Advances in Turning Processes Using Coated Tools—A Comprehensive Review

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 170 ◽  
Author(s):  
Vitor F. C. Sousa ◽  
Francisco J. G. Silva
Keyword(s):  
Continuous Improvement ◽  
Research Topic ◽  
Numerical Control ◽  
Turning Process ◽  
Coated Tools ◽  
Coated Tool ◽  
Significant Step ◽  
Turned Parts ◽  
Lubrication Conditions ◽  
A Current

Turning continues to be the largest segment of the machining industry, which highlights the continued demand for turned parts and the overall improvement of the process. The turning process has seen quite an evolution, from basic lathes using solid tools, to complex CNC (Computer Numerical Control) multi-process machines, using, for the most part, coated inserts and coated tools. These coatings have proven to be a significant step in the production of high-quality parts and a higher tool life that have captivated the industry. Continuous improvement to turning coated tools has been made, with many researches focusing on the optimization of turning processes that use coated tools. In the present paper, a presentation of various recently published papers on this subject is going to be made, mentioning the various types of coatings that have recently been used in the turning process, the turning of hard to machine materials, such as titanium alloys and Inconel, as well as the interaction of these coatings with the turned surfaces, the wear patterns that these coatings suffer during the turning of materials and relating these wear mechanisms to the coated tool’s life expectancy. Some lubrication conditions present a more sustainable alternative to current methods used in the turning process; the employment of coated tool inserts under these conditions is a current popular research topic, as there is a focus on opting for more eco-friendly machining options.

Essential Research in Machining Difficult-to-Machine Materials for Advancing MQL Cutting Technology with a Newly Developed Coated Tool

2014 ◽  
Vol 1017 ◽  
pp. 329-333
Author(s):  
Syunki Shimada ◽  
Masao Kohzaki
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Cutting Tool ◽  
Minimum Quantity Lubrication ◽  
High Wear Resistance ◽  
Cutting Resistance ◽  
Coated Tools ◽  
Coated Tool ◽  
Cutting Experiments ◽  
Lubricating Properties

This study is developing environmentally friendly cutting technologies of difficult-to-machine materials by MQL (Minimum Quantity Lubrication) cutting with Ti-B coated tools. In this research, we performed cutting experiments of difficult-to-machine materials in dry, MQL and wet conditions with non-coated tools. Cutting resistance in the MQL cutting was almost the same as that in the wet cutting. Moreover, damage of the cutting tool was not observed after the MQL cutting. Therefore the MQL cutting is expected to become an advanced cutting technology by using Ti-B coated tools because Ti-B film had high temperature lubricating properties and high wear resistance.

Tribological Influences of TiAlN Coating on Tool Wear for High-Speed Dry and Wet Machining of Steels

2004 ◽  
Author(s):  
Y. J. Lin ◽  
Samir A. Khrais
Keyword(s):  
High Speed ◽  
High Speed Machining ◽  
Structural Variations ◽  
Edge Chipping ◽  
Coated Tools ◽  
Coated Tool ◽  
Carbide Inserts ◽  
Turning Test ◽  
Cemented Carbide Inserts ◽  
Cutting Speeds

The tribological influences of PVD-applied TiAlN coatings on the wear of cemented carbide inserts and the microstructure wear behaviors of the coated tools under dry and wet machining are investigated. The turning test was conducted with variable high cutting speeds ranging from 210 m/min to 410m/min. The analyses based on the experimental results lead to strong evidences that conventional coolant has a retarded effect on TiAlN coatings under high-speed machining. Microwear mechanisms identified in the tests through SEM micrographs include edge chipping, micro-abrasion, micro-fatigue, micro-thermal, and micro-attrition. These micro-structural variations of coatings provide structure-physical alterations as the measures for wear alert of TiAlN coated tool inserts under high speed machining of steels.

Silicon Carbide Ceramic Turning Process Design and Parameter Analysis

2014 ◽  
Vol 800-801 ◽  
pp. 203-207
Author(s):  
Zhen Bo Wang ◽  
Liang Zhang ◽  
Shu Zhi Li
Keyword(s):  
Silicon Carbide ◽  
Process Design ◽  
Numerical Control ◽  
Parameter Analysis ◽  
Machining Process ◽  
Analysis Method ◽  
Single Factor ◽  
Turning Process ◽  
Silicon Carbide Ceramic ◽  
Single Factor Analysis

This article mainly aims at the problem of silicon carbide ceramic mechanical turning difficult processing,by adopting the method of the numerical control turning processing.Design a special fixtures and a NC machining process to accomplish the manufacture of silicon carbide plate.And through the single factor analysis method to process parameters were analyzed.

Problem Solving and Risk Management Methodology

2021 ◽  
pp. 378-395
Author(s):  
Esmeralda Andrade Hernández ◽  
Gregorio Fernández-Lambert ◽  
David Lara Alabazares ◽  
Yesica Mayett Moreno ◽  
Laurent Geneste
Keyword(s):  
Risk Management ◽  
Problem Solving ◽  
Knowledge Base ◽  
Continuous Improvement ◽  
Management Problem ◽  
Current Event ◽  
The Past ◽  
Risk Management Methodology ◽  
Past Experiences ◽  
A Current

Intending to lead organizations to continuous improvement, this chapter proposes a methodology that involves three axes: risk management, problem- solving, and feedback experience. This methodology allows organizations to characterize the experiences they have already confronted, as well as new experiences (which can be risks or problems) with the use of taxonomies established by the organization. It also enables them to capitalize and exploit their knowledge base. This work proposes a best-use approach of the past experiences that are similar to a current event and facilitate their treatment and provide solutions. The authors take the feedback as a point of articulation between the two methodologies because it is a mechanism that offers knowledge where it can be found that the organizations must avoid and take advantage of.

scholarly journals Experimental research method when developing a mathematical model for calculating cutting speed in the course of turning steels with a coated tool

2019 ◽  
Vol 298 ◽  
pp. 00134
Author(s):  
Zhanna Tikhonova ◽  
Evgeniy Frolov ◽  
Dmitriy Krainev ◽  
Alexander Plotnikov
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Experimental Research ◽  
Research Method ◽  
Cutting Speed ◽  
Coated Tools ◽  
Coated Tool ◽  
Cutting Zone

The article is devoted to the description of the experimental research method when developing a mathematical model for calculating the cutting speed based on information from the cutting zone obtained during the test run in the process of turning using steel coated tools as an example. This paper also presents the results of an experimental study which prove the effectiveness of applying the obtained mathematical dependence.

scholarly journals Cutting Performance Evaluation of the Coated Tools in High-Speed Milling of AISI 4340 Steel

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3266 ◽  
Author(s):  
Yuan Li ◽  
Guangming Zheng ◽  
Xiang Cheng ◽  
Xianhai Yang ◽  
Rufeng Xu ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Cutting Force ◽  
High Speed ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Cutting Performance ◽  
High Speed Milling ◽  
Coated Tools ◽  
Coated Tool ◽  
Aisi 4340

The cutting performance of cutting tools in high-speed machining (HSM) is an important factor restricting the machined surface integrity of the workpiece. The HSM of AISI 4340 is carried out by using coated tools with TiN/TiCN/TiAlN multi-coating, TiAlN + TiN coating, TiCN + NbC coating, and AlTiN coating, respectively. The cutting performance evaluation of the coated tools is revealed by the chip morphology, cutting force, cutting temperature, and tool wear. The results show that the serration and shear slip of the chips become more clear with the cutting speed. The lower cutting force and cutting temperature are achieved by the TiN/TiCN/TiAlN multi-coated tool. The flank wear was the dominant wear form in the milling process of AISI 4340. The dominant wear mechanisms of the coated tools include the crater wear, coating chipping, adhesion, abrasion, and diffusion. In general, a TiN/TiCN/TiAlN multi-coated tool is the most suitable tool for high-speed milling of AISI 4340, due to the lower cutting force, the lower cutting temperature, and the high resistance of the element diffusion.

scholarly journals Mechanism of improvement of TiN-coated tool life by nitrogen implantation

2001 ◽  
Vol 16 (11) ◽  
pp. 3293-3303 ◽  
Author(s):  
S. J. Bull ◽  
Yu. P. Sharkeev ◽  
S. V. Fortuna ◽  
I. A. Shulepov ◽  
A. J. Perry
Keyword(s):  
Ion Implantation ◽  
Surface Composition ◽  
Slight Reduction ◽  
Nitrogen Implantation ◽  
Force Microscopy ◽  
Tin Coatings ◽  
Coated Tools ◽  
Atomic Force ◽  
Transmission Electron ◽  
Coated Tool

The life of TiN-coated tools can be improved by a post-coating ion implantation treatment, but the mechanism by which this occurs is still not clear. Nitrogen implantation of both physical-vapor-deposited TiN and CVD TiN leads to surface softening as the dose increases, which has been attributed to amorphization. In this study a combination of transmission electron microscopy and atomic force microscopy was used to characterize the microstructure of implanted TiN coatings on cemented carbide for comparison with mechanical property measurements (nanoindentation, residual stress, etc.), made on the same samples. Ion implantation leads to a slight reduction in the grain size of the TiN in the implanted zone, but there is no evidence for amorphization. Surface softening is observed for physical-vapor-deposited TiN, but this is probably due to a combination of changes in surface composition and the presence of a layer of bubbles generated by the very high implantation doses used.

scholarly journals Classification of Literary Works: Fractality and Complexity of the Narrative, Essay, and Research Article

Entropy ◽  
2020 ◽  
Vol 22 (8) ◽  
pp. 904
Author(s):  
Aldo Ramirez-Arellano
Keyword(s):  
Complex Network ◽  
Path Length ◽  
Research Topic ◽  
Clustering Coefficient ◽  
Node Degree ◽  
Original Text ◽  
Literary Works ◽  
Research Article ◽  
A Current

A complex network as an abstraction of a language system has attracted much attention during the last decade. Linguistic typological research using quantitative measures is a current research topic based on the complex network approach. This research aims at showing the node degree, betweenness, shortest path length, clustering coefficient, and nearest neighbourhoods’ degree, as well as more complex measures such as: the fractal dimension, the complexity of a given network, the Area Under Box-covering, and the Area Under the Robustness Curve. The literary works of Mexican writers were classify according to their genre. Precisely 87% of the full word co-occurrence networks were classified as a fractal. Also, empirical evidence is presented that supports the conjecture that lemmatisation of the original text is a renormalisation process of the networks that preserve their fractal property and reveal stylistic attributes by genre.

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