The Experts below are selected from a list of 12483 Experts worldwide ranked by ideXlab platform
Yue Xian Song - One of the best experts on this subject based on the ideXlab platform.
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research on the chip formation mechanism during the high speed milling of Hardened Steel
International Journal of Machine Tools & Manufacture, 2014Co-Authors: Cheng Yong Wang, Lijuan Zheng, Dewen Tang, Yue Xian SongAbstract:Abstract An easy-to-produce sawtooth chip is the main feature of the high-speed milling process for Hardened Steel. This chip may lead to a high-frequency periodic fluctuation of the cutting force and accelerate the tool׳s wear rate. This study investigated the process of chip formation and the change in chip morphology during the high-speed milling of Hardened Steel (51, 62 HRC). The formation condition of continuous and sawtooth chips and various characteristics of the sawtooth chip, such as cutting speed, feed rate, axial depth of cut, and others, were also studied. The results showed that the chip of materials with different hardnesses could be controlled as a continuous chip through the optimisation of a combination of cutting speed, feed per tooth, and cutting depth. If the feed per tooth and axial depth of the cut were too large within the range of proper cutting speeds generated by a continuous chip, the chip morphology turned into a sawtooth. Increasing the cutting speed during the cutting process not only strengthened the material׳s hardness but also increased the local temperature of the shear band rapidly and aggravated the material׳s heat softness. When these parameters became balanced, the shear deformation became highly localised in the shear band and resulted in adiabatic shear. A quantitative evaluation of the sawtooth-shaped chip׳s deformation degree was performed using the cross-sectional area and angle of the sawtooth chip. By establishing a geometric model of the sawtooth chip formation during the high-speed milling of Hardened Steel, that was used to predict the shear strain and strain rate during chip formation, the range of shear angles generating a sawtooth chip was calculated to be 40–60°.
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Experiment on Optimal Selecting for Cutting Tools in Milling of High Hardened Steel
Materials Science Forum, 2012Co-Authors: Kun Peng Zhang, Cheng Yong Wang, Yue Xian SongAbstract:In this paper, with milling characteristics of high hardness Hardened Steel, we choice six different coated tools to made cutting experiments on high hardness Hardened Steel Cr12MoV (HRC65). In this stage, through the analysis of cutting force, cutting temperature, cutting vibration, machined quality and tool wear, we have elected the preferred tool and tool geometry parameters for this processing stage. The results of the study show that: TiAlSiN is the most suitable for Cr12MoV (HRC65), which helps to improve cutting processing productivity, prolong tool life, and enhance processing quality and reduce the processing cost.
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Cutting Forces in High Speed Milling of Hardened Steel by Coated Tool
Advanced Materials Research, 2009Co-Authors: Cheng Yong Wang, Yue Xian SongAbstract:Hardened Steel P20 at 50 HRC is milled at high speed by TiN coated and TiAlN coated solid carbide straight end mills, and the cutting forces and tool wear are measured. The result shows that TiAlN coated tool is more suitable for cutting Hardened Steel at high speed. Then the Hardened Steel is milled under different cutting parameters. It is indicated that the effect of cutting speed on cutting forces is small, but the effect of cutting speed on machine vibration should be considered. Increase feed per tooth or radial depth of cut will increase the cutting forces.
Cheng Yong Wang - One of the best experts on this subject based on the ideXlab platform.
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research on the chip formation mechanism during the high speed milling of Hardened Steel
International Journal of Machine Tools & Manufacture, 2014Co-Authors: Cheng Yong Wang, Lijuan Zheng, Dewen Tang, Yue Xian SongAbstract:Abstract An easy-to-produce sawtooth chip is the main feature of the high-speed milling process for Hardened Steel. This chip may lead to a high-frequency periodic fluctuation of the cutting force and accelerate the tool׳s wear rate. This study investigated the process of chip formation and the change in chip morphology during the high-speed milling of Hardened Steel (51, 62 HRC). The formation condition of continuous and sawtooth chips and various characteristics of the sawtooth chip, such as cutting speed, feed rate, axial depth of cut, and others, were also studied. The results showed that the chip of materials with different hardnesses could be controlled as a continuous chip through the optimisation of a combination of cutting speed, feed per tooth, and cutting depth. If the feed per tooth and axial depth of the cut were too large within the range of proper cutting speeds generated by a continuous chip, the chip morphology turned into a sawtooth. Increasing the cutting speed during the cutting process not only strengthened the material׳s hardness but also increased the local temperature of the shear band rapidly and aggravated the material׳s heat softness. When these parameters became balanced, the shear deformation became highly localised in the shear band and resulted in adiabatic shear. A quantitative evaluation of the sawtooth-shaped chip׳s deformation degree was performed using the cross-sectional area and angle of the sawtooth chip. By establishing a geometric model of the sawtooth chip formation during the high-speed milling of Hardened Steel, that was used to predict the shear strain and strain rate during chip formation, the range of shear angles generating a sawtooth chip was calculated to be 40–60°.
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Experiment on Optimal Selecting for Cutting Tools in Milling of High Hardened Steel
Materials Science Forum, 2012Co-Authors: Kun Peng Zhang, Cheng Yong Wang, Yue Xian SongAbstract:In this paper, with milling characteristics of high hardness Hardened Steel, we choice six different coated tools to made cutting experiments on high hardness Hardened Steel Cr12MoV (HRC65). In this stage, through the analysis of cutting force, cutting temperature, cutting vibration, machined quality and tool wear, we have elected the preferred tool and tool geometry parameters for this processing stage. The results of the study show that: TiAlSiN is the most suitable for Cr12MoV (HRC65), which helps to improve cutting processing productivity, prolong tool life, and enhance processing quality and reduce the processing cost.
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Cutting Forces in High Speed Milling of Hardened Steel by Coated Tool
Advanced Materials Research, 2009Co-Authors: Cheng Yong Wang, Yue Xian SongAbstract:Hardened Steel P20 at 50 HRC is milled at high speed by TiN coated and TiAlN coated solid carbide straight end mills, and the cutting forces and tool wear are measured. The result shows that TiAlN coated tool is more suitable for cutting Hardened Steel at high speed. Then the Hardened Steel is milled under different cutting parameters. It is indicated that the effect of cutting speed on cutting forces is small, but the effect of cutting speed on machine vibration should be considered. Increase feed per tooth or radial depth of cut will increase the cutting forces.
Min Li Zheng - One of the best experts on this subject based on the ideXlab platform.
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Morphology Optimization Method for Machined Surface of Hardened Steel
International Journal of Control and Automation, 2014Co-Authors: Songtao Wang, Yongda Yan, Min Li Zheng, Yi Hang FanAbstract:The work analyzed the elements of high-speed cutting on Hardened Steel with hierarchy analysis method, studying the relational structure characteristics of control variables and performance indicators in high-speed cutting. And the hierarchy of evaluation indicator in high-speed cutting of Hardened Steel was proposed. Besides, the morphology, controlling flow of machined surface, was studied in high-speed cutting of Hardened Steel, proposing the criterion for surface roughness and surface texture and developing the methods of morphology prediction and control on machined surface. Then, validation experiments were conducted on Hardened-Steel dies of typical automotive panel to evaluate the accuracy and applicability of morphology forecasting and control methods.
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Analysis of Microscopic Damage of Hardened Steel Milling Surface on Mould Service Process
Materials Science Forum, 2014Co-Authors: Wei Zhang, Min Li Zheng, Hong Li LiuAbstract:The service performance is seriously effected by milling machined surface integrity of auto Hardened Steel mould. Basing on the microscopic damage evolution theory and Hardened Steel mould material micro-voids cell model, according to the service process load condition of Hardened Steel milling machined surface, surface microscopic damage evolution analysis had been conducted, surface evolution characteristics was obtained under different shapes void cell. Through comparative analysis the change law of damage evolution internal variable under different shapes void cell can know: respect to the ideal spherical, when the change of void volume fraction and the degree of matrix material yield were considered, the oblate hole more faster and the prolate hole more slower, which provide a further prediction for surface damage.
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The Impact of Hardened Steel Milling Surface Structure on Mould Service Load
Materials Science Forum, 2014Co-Authors: Min Li Zheng, Wei Zhang, Zhao Xing ZhangAbstract:Mould surface loading state is one of the most important factors which would affect the mould performance in the course of service. According to the established Hardened Steel milling surface geometry model, a bending forming numerical simulation of Hardened Steel milling is conducted, the influence law of service process surface load state is analyzed under machined surface geometry structure which is formed by different milling parameters. The research results show: surface load concentrated area is mainly focusing on mould edge transition and fillet in the course of service; the surface geometry structure has an important influence on the mould service load in the course of service, service load more smaller which is more helpful to improve the mould service performance in the course of service.
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Research on Character of Physical Field Distribution in High Speed Ball-End Milling Hardened Steel
Advanced Materials Research, 2013Co-Authors: Bin Jiang, Min Li Zheng, Xianli Liu, Yin Jin Yang, Lei Lei JiangAbstract:In order to mend cutting instability of ball-end milling cutter caused by the changes of cutting loads in high speed milling Hardened Steel, we perform the modal analysis and heat-force coupling field analysis of cutter, carry out the experiment of high speed milling Hardened Steel, investigate the character and effect factor of physical field distribution in high speed ball-end milling Hardened Steel, and propose the method about the match of diameter and overhang for depressing cutter vibration. Results indicate that the decrease in the ratio of overhang to diameter can transform the first modal shape of cutter from bending modal shape into torsion modal shape. The diameter of cutter is from 30mm to 20mm, the overhang of cutter is from 125mm to 90mm, heat-force coupling field distribution changes slightly, resonance of cutter does not occur, and efficiency in machining Hardened Steel can be improved effectively by higher cutting speed.
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Cutting Thickness of High Speed Ball-End Milling Hardened Steel
Advanced Materials Research, 2012Co-Authors: Shu Cai Yang, Min Li Zheng, Bin Jiang, Shuo WangAbstract:In order to solve the problem of machined surface damage and machining efficiency decline that caused by the decrease of effective cutting thickness in high speed ball-end milling Hardened Steel, using high speed cutting adiabatic shearing model, analyzed the adiabatic shearing deformation on Hardened Steel, and proposed the criterion of chip separating position. Analyzed the force in the transformation process from cutting to plowing, the influence of cutter deformation on cutting thickness was studied, and established the minimum cutting thickness model. Having done finite element analysis of cutter and experiment of high speed milling Hardened Steel, the validity of the minimum cutting thickness model was proved. The results show that cutting thickness changes from small to large, and then from large to small under the influence of cutting trajectory and tool edge radius. The deformation of cutter leads to the increase of the minimum cutting thickness, and further enhances chip thickness thinning effect. High feed can compensate cutting thickness thinning and the minimum cutting thickness model provides an effective way to restrain the damage of machined surface and cutter caused by cutter plowing.
Q M Wang - One of the best experts on this subject based on the ideXlab platform.
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Wear and breakage of TiAlN- and TiSiN-coated carbide tools during high-speed milling of Hardened Steel
Wear, 2015Co-Authors: C. Y. Wang, Y. X. Xie, H. S. Lin, Z Qin, Y. H. Yuan, Q M WangAbstract:In the high-speed machining of Hardened Steel for the die and mould industry, determining how to reduce the wear of coated carbide tools and improve their machining efficiency and quality has been an important subject. This study investigated the high-speed machining of Hardened Steel (SKD11/HRC 62, S136/HRC 51) using two types of PVD-coated carbide tools (TiAlN and TiSiN) to determine the mechanism of cutting tool wear and breakage and the effects of tool angle, tool diameter, tool extended length, cutting force and cutting-induced vibration on the tools. The results indicated that the dominant wear patterns of coated carbide tools included flank wear, rack face wear, breakage and micro-chipping. The modes of breakage of the coated carbide tools used for the high-speed milling of Hardened Steel were coating peeling, chipping and tip breakage. The lives of the cutting tools coated with TiSiN were longer than those of the tools coated with TiAlN due to reduced abrasive wear. The tool extended length during machining caused chips to transform from spiral chips into c-shaped chips and produce sawtooth chips as the length increased. The selection of the optimal tool extended length can deliver the minimum cutting force, a small degree of tool wear and the best machining quality. The characteristics of the cutting force can distinctly reflect abnormal conditions as the cutting tool wears. A tool with a small rake angle, suitable clearance angle and large helix angle will not only reduce the cutting force but also ensure a smooth cutting process and generate less cutting tool wear.
Toshiki Hirogaki - One of the best experts on this subject based on the ideXlab platform.
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Basic study of ball end milling on Hardened Steel
Journal of Materials Processing Technology, 2001Co-Authors: Yoshihiro Kita, Hiroyuki Furuike, Yoshiaki Kakino, Heizabro Nakagawa, Toshiki HirogakiAbstract:Abstract This study deals with ball end milling with a (Al,Ti)N-coated tool on Hardened Steel. The cutting forces in ball end milling with a helical flute were obtained theoretically and experimentally not only for a flat surface, but also for an inclined work surface. They are agreed with each other. The influence of the cutting conditions on tool life is discussed: it changed from 200 to 1100 m, depending on the cutting conditions. For the cutting conditions of a large inclined angle of the work-piece surface and a large feed rate, a long tool life was obtained. The causes of reduced tool life changed, depending on the cutting conditions.
