scholarly journals Comparison between a conventional and an antivibrating boring bar in the internal turning of long overhangs

2020 ◽  
Vol 10 (2) ◽  
pp. 145-149
Author(s):  
Thomas Wallyson ◽  
Zsombor Fülöp ◽  
Attila Szilágyi
Keyword(s):  
Surface Quality ◽  
Tool Life ◽  
Hardened Steel ◽  
Workpiece Surface ◽  
Boring Bar

The main objective of this work is to evaluate the use of an antivibrating in an internal turning tool in the machining of hardened steel, comparing it with a conventional solid bar, in order to verify if it is able to cut deep holes without damaging workpiece surface quality and tool life.

Cryogenic-LN2 and conventional emulsion assisted machining of hardened steel: Comparison from sustainability perspective

2020 ◽  
pp. 095440542097199 ◽  
Author(s):  
Aqib Mashood Khan ◽  
Ning He ◽  
Wei Zhao ◽  
Muhammad Jamil ◽  
Hongjun Xia ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Surface Quality ◽  
Tool Life ◽  
Cutting Parameters ◽  
Hardened Steel ◽  
Machining Processes ◽  
Machine Shop ◽  
Workpiece Surface ◽  
Aisi 52100 ◽  
Comparative Results

To achieve an excellent workpiece surface quality and longer tool life in the machining of hardened steel is an excessive challenge. Recently, conventional emulsion cooling assisted machining processes are being used to address this problem. However, such traditional processes have adverse effects on the environment as well as on the machine shop worker’s health. Hence, in this study, the effects of emulsion cooling and sustainable Cryo-LN2 cooling approach on sustainable metrics, such as surface roughness, energy consumption, tool life, and production cost in the external turning of AISI-52100 have been investigated and compared. The comparative results showed that the Cryo-LN2 technique outperformed emulsion cooling for all measured indices. The Cryo-LN2 assisted turning process not only improved surface quality but also consumed 18% less energy consumption and produced 70.9% low-priced products at aggressive cutting parameters as compared to the emulsion. The findings of the current study encourage metal processing industries to use such type of sustainable techniques at a machine shop. This study is based on the “ Think Green, Plan Green and Execute Green” strategy.

scholarly journals Analysis of the compromise between cutting tool life, productivity and roughness during turning of C45 hardened steel

2021 ◽  
Vol 27 (1) ◽  
pp. 30-35
Author(s):  
Youcef Abidi
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Tool Life ◽  
Cutting Tool ◽  
Cutting Speed ◽  
Hardened Steel ◽  
Coefficient Of Determination ◽  
Depth Of Cut ◽  
Machining Productivity ◽  
Mixed Ceramic

Abstract Tool wear and surface roughness as performance indexes are considered to be the most important in terms of hardened materials’ machinability. The best combination of cutting parameters which enhances the compromise between tool life, productivity and machined surface quality contribute to benefice on production cost, which makes manufacturing industry interested in it. The aim of this research is to investigate the life of ceramic cutting tool and machining productivity together with surface roughness during turning of hardened steel C45, with focus on the selection of the optimal cutting parameter combination. The experiments are carried out based on uni-factorial planning methodology of cutting speeds and feed rates. The results show that the mixed ceramic tool is suitable for turning hardened steel C45 (40 HRC) and the conclusion is that it performed well in terms of tool life, productivity and surface quality at a combination of cutting speed (200 m/min), feed (0.08 mm/rev) and depth of cut (0.3 mm). Additionally, a tool life model has been proposed which is presented very high coefficient of determination.

Metal Low Temperature Brittleness and Low Temperature Machining

2011 ◽  
Vol 79 ◽  
pp. 288-292
Author(s):  
Li Hong Liu ◽  
Han Bing Cao ◽  
Zhan Ni Li
Keyword(s):  
Low Temperature ◽  
Brittle Fracture ◽  
Surface Quality ◽  
Tool Life ◽  
Nominal Stress ◽  
Yield Limit ◽  
Test Results ◽  
Workpiece Surface ◽  
Metal Materials

Most metal materials tend to produce brittle fracture at low temperature. Nominal stress of producing brittle fracture is low, generally lower than yield limit. By use of this property, the machinability of the workpiece, tool life and workpiece surface quality can be improved. Classification and application of low temperature machining was introduced in the paper. Tests of low temperature machining were carried out. The test results show low temperature machining is superior to the cutting in normal temperature for the aspects of tool life and the roughness of workpiece surface.

Evaluation of tool life and workpiece surface roughness in turning of AISI D6 hardened steel using PCBN tools and minimum quantity of lubricant (MQL) applied at different directions

2019 ◽  
Vol 103 (1-4) ◽  
pp. 971-984 ◽  
Author(s):  
Miguel Mandú Bonfá ◽  
Éder Silva Costa ◽  
Wisley Falco Sales ◽  
Fred Lacerda Amorim ◽  
Luis Henrique Andrade Maia ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Tool Life ◽  
Hardened Steel ◽  
Workpiece Surface ◽  
Minimum Quantity ◽  
Pcbn Tools

scholarly journals Study of ultrasonic vibration–assisted thread turning of Inconel 718 superalloy

2019 ◽  
Vol 11 (10) ◽  
pp. 168781401988377
Author(s):  
Yu He ◽  
Zhongming Zhou ◽  
Ping Zou ◽  
Xiaogang Gao ◽  
Kornel F Ehmann
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Inconel 718 ◽  
Gas Turbines ◽  
Tool Path ◽  
Machining Parameters ◽  
Thread Cutting ◽  
Workpiece Surface ◽  
Inconel 718 Superalloy ◽  
The Relationship

With excellent properties, high-temperature superalloys have become the main application materials for aircraft engines, gas turbines, and many other devices. However, superalloys are typically difficult to machine, especially for the thread cutting. In this article, an ultrasonic vibration–assisted turning system is proposed for thread cutting operations in superalloys. A theoretical analysis of ultrasonic vibration–assisted thread cutting is carried out. An ultrasonic vibration–assisted system was integrated into a standard lathe to demonstrate thread turning in Inconel 718 superalloy. The influence of ultrasonic vibration–assisted machining on workpiece surface quality, chip shape, and tool wear was analyzed. The relationship between machining parameters and ultrasonic vibration–assisted processing performance was also explored. By analyzing the motion relationship between tool path and workpiece surface, the reasons for improved workpiece surface quality by ultrasonic vibration–assisted machining were explained.

scholarly journals Experimental investigation of the machining characteristics in diamond wire sawing of unidirectional CFRP

2021 ◽  
Author(s):  
Lukas Seeholzer ◽  
Stefan Süssmaier ◽  
Fabian Kneubühler ◽  
Konrad Wegener
Keyword(s):  
Surface Quality ◽  
Influencing Factors ◽  
Material Properties ◽  
High Surface ◽  
Workpiece Surface ◽  
High Surface Quality ◽  
High Productivity ◽  
Surface Temperatures ◽  
Process Forces ◽  
The Wire

AbstractEspecially for slicing hard and brittle materials, wire sawing with electroplated diamond wires is widely used since it combines a high surface quality with a minimum kerf loss. Furthermore, it allows a high productivity by machining multiple workpieces simultaneously. During the machining operation, the wire/workpiece interaction and thus the material removal conditions with the resulting workpiece quality are determined by the material properties and the process and tool parameters. However, applied to machining of carbon fibre reinforced polymers (CFRP), the process complexity potentially increases due to the anisotropic material properties, the elastic spring back potential of the material, and the distinct mechanical wear due to the highly abrasive carbon fibres. Therefore, this experimental study analyses different combinations of influencing factors with respect to process forces, workpiece surface temperatures at the wire entrance, and the surface quality in wire sawing unidirectional CFRP material. As main influencing factors, the cutting and feed speeds, the density of diamond grains on the wire, the workpiece thickness, and the fibre orientation of the CFRP material are analysed and discussed. For the tested parameter settings, it is found that while the influence of the grain density is negligible, workpiece thickness, cutting and feed speeds affect the process substantially. In addition, higher process forces and workpiece surface temperatures do not necessarily deteriorate the surface quality.

scholarly journals Influence of Ground End Mill Surface Quality on Cutting Tool Life

2017 ◽  
Vol 17 (6) ◽  
pp. 952-957 ◽  
Author(s):  
Vaclav Schornik ◽  
Miroslav Zetek ◽  
Tomas Baksa
Keyword(s):  
Surface Quality ◽  
Tool Life ◽  
Cutting Tool ◽  
End Mill

Research on Surface Roughness Prediction Model for High-Speed Milling Inclined Plane of Hardened Steel

2010 ◽  
Vol 97-101 ◽  
pp. 2044-2048 ◽  
Author(s):  
Yuan Ling Chen ◽  
Bao Lei Zhang ◽  
Wei Ren Long ◽  
Hua Xu
Keyword(s):  
Surface Roughness ◽  
Prediction Model ◽  
High Speed ◽  
Hardened Steel ◽  
Prediction Errors ◽  
Inclined Plane ◽  
Workpiece Surface ◽  
Factors Influencing ◽  
Generalized Regression Neural Networks ◽  
Roughness Prediction

As the factors influencing the workpiece surface roughness is complexity and uncertainty, according to orthogonal experimental results, the paper established Empirical regression prediction model and generalized regression neural networks (GRNN) for prediction of surface roughness when machining inclined plane of hardened steel in high speed , moreover, compared their prediction errors. The results show that GRNN model has better prediction accuracy than empirical regression prediction model and can be better used to control the surface roughness dynamically.

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