The Experts below are selected from a list of 14748 Experts worldwide ranked by ideXlab platform
Matthew A Davies - One of the best experts on this subject based on the ideXlab platform.
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on repeated adiabatic shear band formation during High Speed Machining
International Journal of Plasticity, 2002Co-Authors: Timothy J Burns, Matthew A DaviesAbstract:Abstract We compare the repeated adiabatic shear band formation that takes place at sufficiently large cutting Speeds in a number of materials during High-Speed Machining operations with the more well-known formation of a single shear band that often takes place at sufficiently large strain rates in dynamic torsion tests on these materials. We show that there are several major differences in the physics of the two deformation processes. In particular, the shear stress in Machining over the tool-material contact length is not even approximately homogeneous. Additionally, in High-Speed Machining, the material flow can become convection-dominated, so that the tool can “outrun” the thermal front generated in the workpiece material by the High-strain-rate cutting process. We demonstrate by means of a one-dimensional continuum model that these differences can lead to repeated oscillations in the plastic flow of the workpiece material during High-Speed Machining, leading to the repeated formation of adiabatic shear bands.
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On repeated adiabatic shear band formation during High-Speed Machining ☆
International Journal of Plasticity, 2002Co-Authors: Timothy J Burns, Matthew A DaviesAbstract:Abstract We compare the repeated adiabatic shear band formation that takes place at sufficiently large cutting Speeds in a number of materials during High-Speed Machining operations with the more well-known formation of a single shear band that often takes place at sufficiently large strain rates in dynamic torsion tests on these materials. We show that there are several major differences in the physics of the two deformation processes. In particular, the shear stress in Machining over the tool-material contact length is not even approximately homogeneous. Additionally, in High-Speed Machining, the material flow can become convection-dominated, so that the tool can “outrun” the thermal front generated in the workpiece material by the High-strain-rate cutting process. We demonstrate by means of a one-dimensional continuum model that these differences can lead to repeated oscillations in the plastic flow of the workpiece material during High-Speed Machining, leading to the repeated formation of adiabatic shear bands.
Timothy J Burns - One of the best experts on this subject based on the ideXlab platform.
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on repeated adiabatic shear band formation during High Speed Machining
International Journal of Plasticity, 2002Co-Authors: Timothy J Burns, Matthew A DaviesAbstract:Abstract We compare the repeated adiabatic shear band formation that takes place at sufficiently large cutting Speeds in a number of materials during High-Speed Machining operations with the more well-known formation of a single shear band that often takes place at sufficiently large strain rates in dynamic torsion tests on these materials. We show that there are several major differences in the physics of the two deformation processes. In particular, the shear stress in Machining over the tool-material contact length is not even approximately homogeneous. Additionally, in High-Speed Machining, the material flow can become convection-dominated, so that the tool can “outrun” the thermal front generated in the workpiece material by the High-strain-rate cutting process. We demonstrate by means of a one-dimensional continuum model that these differences can lead to repeated oscillations in the plastic flow of the workpiece material during High-Speed Machining, leading to the repeated formation of adiabatic shear bands.
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On repeated adiabatic shear band formation during High-Speed Machining ☆
International Journal of Plasticity, 2002Co-Authors: Timothy J Burns, Matthew A DaviesAbstract:Abstract We compare the repeated adiabatic shear band formation that takes place at sufficiently large cutting Speeds in a number of materials during High-Speed Machining operations with the more well-known formation of a single shear band that often takes place at sufficiently large strain rates in dynamic torsion tests on these materials. We show that there are several major differences in the physics of the two deformation processes. In particular, the shear stress in Machining over the tool-material contact length is not even approximately homogeneous. Additionally, in High-Speed Machining, the material flow can become convection-dominated, so that the tool can “outrun” the thermal front generated in the workpiece material by the High-strain-rate cutting process. We demonstrate by means of a one-dimensional continuum model that these differences can lead to repeated oscillations in the plastic flow of the workpiece material during High-Speed Machining, leading to the repeated formation of adiabatic shear bands.
J R Alique - One of the best experts on this subject based on the ideXlab platform.
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an investigation of tool wear monitoring in a High Speed Machining process
Sensors and Actuators A-physical, 2004Co-Authors: Rodolfo E. Haber, Jose E. Jiménez, Ronei C Peres, J R AliqueAbstract:Abstract The monitoring of High-Speed Machining processes is a key issue for ensuring better use of new machine-tool capabilities. An investigation of tool-wear monitoring in a High-Speed Machining process on the basis of the analysis of different signals’ signatures in the time and frequency domains is presented in this paper. Sensorial information from relevant sensors (i.e., dynamometer, accelerometer and acoustic-emission (AE) sensor) is compared and analyzed, assessing the deviation in representative variables in the time and frequency domains. The time- and frequency-domain analysis confirms the relevance of cutting-force and vibration signals’ signatures for tool-wear monitoring in High-Speed Machining (HSM) processes. Likewise, the spectrum analysis of AE signals corroborates that AE sensors are very sensitive to changes of tool condition, with increasing amplitudes of up to 160 kHz for worn tools.
Ruan Jingkui - One of the best experts on this subject based on the ideXlab platform.
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High-Speed Machining auto panel dies database system based on CBR
2011 International Conference on Electric Information and Control Engineering, 2011Co-Authors: Ruan Jingkui, Zhou XieliangAbstract:It is very imperative to develop High-Speed Machining database for manufacturing industries that apply High-Speed Machining commonly. Case-based reasoning (CBR) is an available approach for developing High-Speed Machining database. The function of High-Speed Machining database system for auto panel dies with case-based reasoning was marked out, and its structure was established. The study emphasized on resolving key techniques such as the expression of High-Speed Machining case, case similarity and its calculation, and case searching. This CBR High-Speed Machining database system was developed and applied in the process of auto panel dies.
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Study on technology of High-Speed Machining auto panel dies
2010 International Conference on Mechanic Automation and Control Engineering, 2010Co-Authors: Ruan Jingkui, Zhou Xue-liangAbstract:In order to study High-Speed Machining mechanism and optimize Machining parameter, the technique coupling numerical simulation of High-Speed Machining process and case-based reasoning (CBR) is proposed. The process of High-Speed Machining auto panel dies is simulated with FEM and the most appropriate High-Speed Machining parameters are selected. A High-Speed Machining parameters database for auto panel dies with case-based reasoning is developed and integrated into UG NX3 system. The research result is applied to productive practice and its effect is perfect.
Wenjie Liu - One of the best experts on this subject based on the ideXlab platform.
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High Speed Machining of titanium alloys using the driven rotary tool
International Journal of Machine Tools & Manufacture, 2002Co-Authors: Shuting Lei, Wenjie LiuAbstract:Abstract Machining of titanium at High cutting Speeds such as from 4 m/s to 8 m/s is very challenging. In this paper, a new generation of driven rotary lathe tool was developed for High-Speed Machining of a titanium alloy, Ti–6Al–4V. The rotary tool was designed and fabricated based on the requirements of compact structure, sufficient stiffness and minimal edge runout. Cylindrical turning experiments were conducted using the driven rotary tool (DRT) and a stationary cutting tool with the same insert, for comparison in the High-Speed Machining of Ti–6Al–4V. The results showed that the DRT can significantly increase tool life. Increase in tool life of more than 60 times was achieved under certain conditions. The effects of the rotational Speed of the insert were also investigated experimentally. Cutting forces were found to decline slightly with increase of the rotational Speed. Tool wear appears to increase with the rotational Speed in a certain Speed range.
