The Experts below are selected from a list of 26220 Experts worldwide ranked by ideXlab platform
Wenyu Yang - One of the best experts on this subject based on the ideXlab platform.
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an experimental investigation of temperature distribution in workpiece Machined Surface layer in turning
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: Kun Huang, Wenyu Yang, Qilin Chen, Shaojie HeAbstract:Cutting temperature in workpiece has significant effects on Machined Surface integrity, including residual stress formation, metallurgical alteration, and microstructural change of workpiece material. In order to investigate temperature distribution in workpiece Machined Surface layer in external turning, an experimental investigation is carried out using physical vapor deposition (PVD) film method. This method provides an access to study temperature distribution as a function of depth in workpiece in turning. Effects of cutting parameters (cutting speed, feed rate, and depth of cut) on temperature distribution have been studied in dry cutting. Wet cutting condition was also studied in this paper to investigate the effects of different proportions of emulsion in cutting fluid on temperature distribution. This experimental investigation provides a new insight into the temperature distribution in workpiece Machined Surface layer in turning and is essential to the further research of Machined Surface integrity.
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analytical model of temperature field in workpiece Machined Surface layer in orthogonal cutting
Journal of Materials Processing Technology, 2016Co-Authors: Kun Huang, Wenyu YangAbstract:Abstract The cutting temperature has significant effects on the Machined Surface integrity, including the residual stress formation, metallurgical alteration and microstructural change of the workpiece. In this study, based on an analysis of the isothermal patterns in the workpiece for orthogonal cutting derived by Komanduri and Hou’s thermal model, the authors noted that the temperature variations presented by the model do not indicate the cooling process of the workpiece and therefore the results are not consistent with the actual cutting process. Thus the authors improved the thermal model by introducing the heating time at the point of interest on the workpiece. The geometries of the computed isothermal patterns show that the cooling process of the workpiece has been successfully considered in the improved model. Moreover, the temperature penetration depth derived from the computed isotherms was studied under various cutting conditions. The computed results show that temperature exponentially decreases as the depth increases, which is consistent with the results obtained using the finite element model software AdvantEdge. In addition, the temperature penetration depths were compared with those obtained from physical vapor deposition film experiment, consistency was observed with the measured values. The improved thermal model will be of great significance for the study of the residual stress and heat affected zone on the Machined Surface.
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An experimental investigation of temperature distribution in workpiece Machined Surface layer in turning
The International Journal of Advanced Manufacturing Technology, 2015Co-Authors: Kun Huang, Wenyu Yang, Chen Qilin, He ShaojieAbstract:Cutting temperature in workpiece has significant effects on Machined Surface integrity, including residual stress formation, metallurgical alteration, and microstructural change of workpiece material. In order to investigate temperature distribution in workpiece Machined Surface layer in external turning, an experimental investigation is carried out using physical vapor deposition (PVD) film method. This method provides an access to study temperature distribution as a function of depth in workpiece in turning. Effects of cutting parameters (cutting speed, feed rate, and depth of cut) on temperature distribution have been studied in dry cutting. Wet cutting condition was also studied in this paper to investigate the effects of different proportions of emulsion in cutting fluid on temperature distribution. This experimental investigation provides a new insight into the temperature distribution in workpiece Machined Surface layer in turning and is essential to the further research of Machined Surface integrity.
Kun Huang - One of the best experts on this subject based on the ideXlab platform.
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an experimental investigation of temperature distribution in workpiece Machined Surface layer in turning
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: Kun Huang, Wenyu Yang, Qilin Chen, Shaojie HeAbstract:Cutting temperature in workpiece has significant effects on Machined Surface integrity, including residual stress formation, metallurgical alteration, and microstructural change of workpiece material. In order to investigate temperature distribution in workpiece Machined Surface layer in external turning, an experimental investigation is carried out using physical vapor deposition (PVD) film method. This method provides an access to study temperature distribution as a function of depth in workpiece in turning. Effects of cutting parameters (cutting speed, feed rate, and depth of cut) on temperature distribution have been studied in dry cutting. Wet cutting condition was also studied in this paper to investigate the effects of different proportions of emulsion in cutting fluid on temperature distribution. This experimental investigation provides a new insight into the temperature distribution in workpiece Machined Surface layer in turning and is essential to the further research of Machined Surface integrity.
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analytical model of temperature field in workpiece Machined Surface layer in orthogonal cutting
Journal of Materials Processing Technology, 2016Co-Authors: Kun Huang, Wenyu YangAbstract:Abstract The cutting temperature has significant effects on the Machined Surface integrity, including the residual stress formation, metallurgical alteration and microstructural change of the workpiece. In this study, based on an analysis of the isothermal patterns in the workpiece for orthogonal cutting derived by Komanduri and Hou’s thermal model, the authors noted that the temperature variations presented by the model do not indicate the cooling process of the workpiece and therefore the results are not consistent with the actual cutting process. Thus the authors improved the thermal model by introducing the heating time at the point of interest on the workpiece. The geometries of the computed isothermal patterns show that the cooling process of the workpiece has been successfully considered in the improved model. Moreover, the temperature penetration depth derived from the computed isotherms was studied under various cutting conditions. The computed results show that temperature exponentially decreases as the depth increases, which is consistent with the results obtained using the finite element model software AdvantEdge. In addition, the temperature penetration depths were compared with those obtained from physical vapor deposition film experiment, consistency was observed with the measured values. The improved thermal model will be of great significance for the study of the residual stress and heat affected zone on the Machined Surface.
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An experimental investigation of temperature distribution in workpiece Machined Surface layer in turning
The International Journal of Advanced Manufacturing Technology, 2015Co-Authors: Kun Huang, Wenyu Yang, Chen Qilin, He ShaojieAbstract:Cutting temperature in workpiece has significant effects on Machined Surface integrity, including residual stress formation, metallurgical alteration, and microstructural change of workpiece material. In order to investigate temperature distribution in workpiece Machined Surface layer in external turning, an experimental investigation is carried out using physical vapor deposition (PVD) film method. This method provides an access to study temperature distribution as a function of depth in workpiece in turning. Effects of cutting parameters (cutting speed, feed rate, and depth of cut) on temperature distribution have been studied in dry cutting. Wet cutting condition was also studied in this paper to investigate the effects of different proportions of emulsion in cutting fluid on temperature distribution. This experimental investigation provides a new insight into the temperature distribution in workpiece Machined Surface layer in turning and is essential to the further research of Machined Surface integrity.
Hiroyuki Sasahara - One of the best experts on this subject based on the ideXlab platform.
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temperature measurement of cutting tool and Machined Surface layer in milling of cfrp
International Journal of Machine Tools & Manufacture, 2013Co-Authors: Takeshi Yashiro, Takayuki Ogawa, Hiroyuki SasaharaAbstract:Abstract The measurement of cutting temperature is important when dealing with carbon fiber-reinforced plastics (CFRPs). Temperatures higher than the glass-transition temperature of the matrix resin are not favorable as they damage the CFRP. In this research, the cutting temperature in the endmill machining process was measured using three methods. The measured cutting point temperature exceeded the glass-transition temperature. However, the influence of temperature elevation at the cutting point could be reduced by taking a suitable distance from the Machined Surface depending on the cutting speed. In addition, observation of the Machined Surface with SEM revealed that the matrix resin at the Machined Surface was not damaged even if the cutting speed was over 300 m/min. This phenomenon depends on the low thermal conductivity of the CFRP. Therefore, high-speed cutting is applicable for the milling of CFRP.
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Prediction model of Surface residual stress within a Machined Surface by combining two orthogonal plane models
International Journal of Machine Tools & Manufacture, 2004Co-Authors: Hiroyuki Sasahara, Toshiyuki Obikawa, Takahiro ShirakashiAbstract:Abstract The variation of Surface residual stress within a Machined Surface layer caused by face turning was studied. The size of the tool’s corner radius and the feed rate affect residual stress. A process model using the finite element method is proposed and the mechanical effects of the corner radius and feed rate on a Machined Surface were discussed. When a tool with a small corner radius is used, Surface residual stress perpendicular to the cutting direction becomes compression stress. As well, Surface residual stress changes from tension to compression as the feed rate decreases. The process model consists of an orthogonal cutting simulation and an indentation-like simulation of a corner radius into a work piece Surface. The simulated results show quantitative agreement with the residual stress measured experimentally. The integrity of the Machined Surface will be controlled more efficiently if the cutting conditions during finishing are determined with the proper consideration of the Surface generating process.
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Development of a new tool to generate compressive residual stress within a Machined Surface
International Journal of Machine Tools and Manufacture, 2004Co-Authors: Toshiaki Segawa, Hiroyuki Sasahara, Masaomi TsutsumiAbstract:Abstract Generally, critical Machined parts such as aircraft parts require high fatigue strength and resistance to stress corrosion cracking. These Machined parts almost all usually have tensile residual stress within the Machined Surface after milling. However, if the compressive residual stress within the Machined Surface can be obtained by a milling process alone, it is expected that fatigue strength and resistance to stress corrosion cracking of the Machined components will be improved. The purpose of this study is to develop a new tool that can generate compressive residual stress within the Machined Surface concurrently with the milling process. This tool has cutting edges for material removal and a projection pin for a burnishing-like process. It was shown that the proposed cutter could generate effective compressive residual stress within the Machined Surface during the milling process. Residual stress levels were in the region of −100 to −200 MPa on the Machined Surface, and −300 to −400 MPa at 0.05 mm beneath the Surface. These levels are almost comparable with those obtained by the shot peening process.
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Control of the Mechanical Property on Machined Surface by a New Tool for Cutting-Burnishing Combined Process
Manufacturing Engineering and Materials Handling Engineering, 2004Co-Authors: Toshiaki Segawa, Hiroyuki Sasahara, Masaomi TsutsumiAbstract:We have developed a new tool that is called as the “Compressive Residual Stress Generating cutter” (CRSG cutter)[1]. The CRSG cutter can generate effective compressive residual stress within the Machined Surface concurrently with the milling process. It is expected to improve mechanical properties such as the fatigue life and the resistance to stress corrosion cracking. The purpose of this study is to investigate the possibility of controlling the residual stress state within the Machined Surface with varying the machining conditions using the CRSG cutter. It was shown that the quantity of the plastic deformation of the Machined Surface affects the residual stress. The setting of the machining conditions with the CRSG cutter can control the plastic deformation quantity. The cross feed width can change plastic deformation on the Machined Surface that is the key factor in order to control the residual stress within the Machined Surface.Copyright © 2004 by ASME
Ming Chen - One of the best experts on this subject based on the ideXlab platform.
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Investigation on the vibration and Machined Surface quality in tilt side milling of thin-walled plates
The International Journal of Advanced Manufacturing Technology, 2019Co-Authors: Gongyu Liu, Jiaqiang Dang, Weiwei Ming, Ming ChenAbstract:Tilting milling tools to proper angles could help significantly suppress machining vibrations and enhance Machined Surface quality. The aim of this study is to investigate how the two fundamental variables, tool helix angle (β) and tilt angle (θ), could influence milling vibrations and Machined Surface topography when milling sidewall Surfaces of thin-walled plates with solid end mills. A series of side milling tests were carried out at different tilt angles utilizing tools with different helix angles, during which the accelerations, instantaneous vibration displacements, cutting forces, Machined Surface roughness, and topographies of the workpiece were carefully measured. The results showed that the minimum Machined Surface roughness across the measured Surface, Ra, was 0.37 μm when β = 40° and θ = 30°. In addition, optimal tilt angles for the lowest Ra on the Machined Surface with tools of different helix angles are in accordance with the optimal angles for the minimum absolute value of Z-axis force Fz, rather than ones for the weakest vibrations. This result indicates that, when milling sidewall Surfaces of thin-walled plates, Ra is more highly dependent on the cutting force component along the lowest stiffness direction of plates than the vibration amplitudes. The results presented in this paper are useful insights for milling process parameter optimization to improve Machined Surface quality in milling sidewall Surfaces of thin-walled components.
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Effects of tool helix angles on Machined Surface morphology in tilt side milling of cantilever thin-walled plates
Procedia CIRP, 2018Co-Authors: Ming Chen, Gongyu Liu, Jiaqiang Dang, Weiwei MingAbstract:Abstract For milling the side wall Surfaces of cantilever thin-walled plates, to tilt the tool to a proper angle could decrease the cutting force component in the direction of the lowest stiffness of the plates, and then mitigate the chatter, resulting in the improvement of the Machined Surface finish. The tool helix angle and tilt angle are the two major variables determining the cutting force component, accordingly having significant effects on the Machined Surface morphology. In this paper, these effects are investigated through experiments with solid end mills of different helix angles.With the Surface roughness Ra as the quantification assessment parameter for Machined Surface morphologies, variations of Surface morphologies not only with the tool tilt angles but also with the tool helix angles are investigated. The mathematical model expressing the relation between the tool helix angle and the corresponding optimal tilt angle is built when the quality of the Machined Surfaces is the best. For better understanding the effects of these two variables on the dynamic vibrations of the workpiecethat directly contributes to the formation of Surface morphologies, especially chatter marks, the instantaneous vibration displacements of plates during the milling process are also measured by a laser range sensor, and the effects on the Surface roughness are analyzed. This study could provide guidance for process parameters optimization in milling the sidewall Surfaces of thin-walled components.
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Influence of Fiber Orientation on Machined Surface Quality in Milling of Unidirectional CFRP Laminates
Advanced Materials Research, 2016Co-Authors: Chang Ying Wang, Liang Wen, Chengdong Wang, Hong Zhou Zhang, Ming ChenAbstract:Machined Surface quality is the deciding factor when evaluating the machinability of CFRP. This present work concerns the influence of fiber orientation on the Machined Surface quality of the Machined Surface in terms of Surface morphology and Surface roughness during milling of unidirectional T800/X850 CFRP laminates. Four group milling tests are conducted under the fiber orientation angle of 0°, 45°, 90° and 135°, respectively. For the fiber orientation angle of 0°, the Machined defects are mainly fiber pull-out and fiber brittle fracture owing to interfacial debonding between the fibers and matrix resin. For the fiber orientation angle of 45°, the Machined defects are mainly resin cavities and the Surface morphology is rough and presents wavy fractures. For the fiber orientation angle of 90°, smooth or neat Surface is observed except for the Surface as the cutting tool cutting in the workpiece on which severe cracks are observed. For the fiber orientation angle of 135°, the Surface is smooth with less fibers pull-out. Evaluation profile and Surface roughness of the Machined Surfaces were measured as well. Dramatically fluctuate of the evaluation profile is observed for the fiber orientation angle of 45° with a high Surface roughness Ra. Verification tests were also conducted on the multidirectional CFRP (cross-ply) laminates. It is indicated that the presence of the fiber orientation angle of 45° is the main factor leading to the decline of the Machined Surface quality.
Samik Dutta - One of the best experts on this subject based on the ideXlab platform.
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Tool condition classification in turning process using hidden Markov model based on texture analysis of Machined Surface images
Measurement, 2016Co-Authors: Nagaraj N. Bhat, Samik DuttaAbstract:Abstract Tool condition monitoring has found its importance to meet the requirement of production quality in industries. Machined Surface texture is directly affected by the extent of tool wear. Hence, by analyzing the Machined Surface images, the information about the cutting tool condition can be obtained. This paper presents a novel technique for tool wear classification using hidden Markov model (HMM) technique applied on the features extracted from the gray level co-occurrence matrix (GLCM) of Machined Surface images. The tool conditions are classified into sharp, semi-dull and dull tool states. The proposed method is found to be cost effective and reliable for on-machine tool classification of cutting tool wear with an average of 95% accuracy.
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Tool condition monitoring by SVM classification of Machined Surface images in turning
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: Nagaraj N. Bhat, Samik Dutta, Tarun VashisthAbstract:Tool condition monitoring has found its importance to meet the requirement of quality production in industries. Machined Surface is directly affected by the extent of tool wear. Hence, by analyzing the Machined Surface, the information about the cutting tool condition can be obtained. This paper presents a novel technique for multi-classification of tool wear states using a kernel-based support vector machine (SVM) technique applied on the features extracted from the gray-level co-occurrence matrix (GLCM) of Machined Surface images. The tool conditions are classified into sharp, semi-dull, and dull tool states by using Gaussian and polynomial kernels. The proposed method is found to be cost-effective and reliable for online tool wear classification.
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progressive cutting tool wear detection from Machined Surface images using voronoi tessellation method
Journal of Materials Processing Technology, 2013Co-Authors: Anurup Datta, Samik Dutta, Surjya K Pal, Ranjan SenAbstract:Abstract Tool condition monitoring by machine vision approach has been gaining popularity day by day since it is a low cost and flexible method. In this paper, a tool condition monitoring technique by analysing turned Surface images has been presented. The aim of this work is to apply an image texture analysis technique on turned Surface images for quantitative assessment of cutting tool flank wear, progressively. A novel method by the concept of Voronoi tessellation has been applied in this study to analyse the Surface texture of Machined Surface after the creation of Voronoi diagram. Two texture features, namely, number of polygons with zero cross moment and total void area of Voronoi diagram of Machined Surface images have been extracted. A correlation study between measured flank wear and extracted texture features has been done for depicting the tool flank wear. It has been found that number of polygons with zero cross moment has better linear relationship with tool flank wear than that of total void area.
