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ANALYTICAL CHIP FORMATION MODEL OF MICRO-END-MILLING 被引量:5
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作者 LI Chengfeng LAI Xinmin +2 位作者 LI Hongtao PENG Linfa NI Jun 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2008年第1期5-8,共4页
A new analytical chip formation model is proposed for micro-end-milling operations. The model calculates an instantaneous uncut chip thickness by considering the combination of exact trochoidal trajectory of the tool ... A new analytical chip formation model is proposed for micro-end-milling operations. The model calculates an instantaneous uncut chip thickness by considering the combination of exact trochoidal trajectory of the tool tip and tool run-out, while the simplified circular trajectory and the neglected run-out create negligible change in conventional-scale chip formation models. Newton-Raphson iterative method is employed during the calculation to obtain quadratic convergence. The proposed approach allows the calculation of instantaneous uncut chip thickness to be done accurately and rapidly, and the prediction accuracy of this model is also verified by comparing the simulation results to experimental cutting forces. 展开更多
关键词 chip formation END-MILLING Run-out
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Chip Formation Mechanism of Inconel 718: A Review of Models and Approaches 被引量:4
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作者 Chun Liu Min Wan +1 位作者 Weihong Zhang Yun Yang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2021年第2期52-67,共16页
Inconel 718,a nickel,chrome and iron alloy,has special advantages,such as high-temperature strength,thermal resistance and corrosion resistance,which facilitate wide usage in the aerospace industry,especially in the h... Inconel 718,a nickel,chrome and iron alloy,has special advantages,such as high-temperature strength,thermal resistance and corrosion resistance,which facilitate wide usage in the aerospace industry,especially in the hot sections of gas turbine engines.However,machining this alloy is correlated closely with the material’s inherent properties such as excellent combination of strength,hardness and toughness,low thermal conductivity and the tendency to adhere to cutting tools.This nickel alloy also contains inclusions of hard abrasive carbide particles that lead to work-hardening of the workpiece material and thus abrasive wear of the cutting tool.That is,the machining of Inconel 718 is always influenced by high mechanical and thermal loads.This article reviews the chip formation mechanism of Inconel 718.One of the main characteristics in machining of Inconel 718 is that it will produce serrated or segmented chips in a wide range of cutting speeds and feeds.Existing studies show that the chip serration or segmentation by shear localization affects the machined surface integrity,and also contributes to the chip’s evacuation and the automation of machining operations.Thus,research conclusion indicates that the serrated or segmented chip phenomenon is desirable in reducing the level of cutting force,and detailed analysis of models and approaches to understand the chip formation mechanism of Inconel 718 is vital for machining this alloy effectively and efficiently.Therefore,this article presents some summaries on the models and approaches on the chip formation in machining of Inconel 718. 展开更多
关键词 Inconel 718 chip formation mechanism Shear instability Segmented chip
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Chip formation in high speed milling of Ti-6Al-4V alloy under nitrogen-oil-mist 被引量:2
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作者 赵威 何宁 +1 位作者 李亮 满忠雷 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第4期564-567,共4页
High speed milling experiments using nitrogen-oil-mist as the cutting medium were carried out to investigate the characteristics of chip formation for Ti-6Al-4V alloy.Within the range of conditions employed(cutting sp... High speed milling experiments using nitrogen-oil-mist as the cutting medium were carried out to investigate the characteristics of chip formation for Ti-6Al-4V alloy.Within the range of conditions employed(cutting speed,vc=190-300 m/min;cutting depth of axial,ap=5,7 mm),saw-tooth chips were produced in these experiments.During the macro and micro analysis of the Ti-6Al-4V chips,an optical microscope and a scanning electron microscope(SEM)were used to study the microstructure and the morphology of the chips,and the X-ray photoelectron spectroscopy(XPS)was employed for chemical analysis.Comparisons were made to study the influence of different cutting media(nitrogen-oil-mist,air-oil-mist and dry cutting condition)on chip formation.Results indicate that cutting media have significant effects on chip formation.Nitrogen-oil-mist is more suitable for improving the contact condition at chip-tool interface and increasing the tool life in high speed milling of Ti-6Al-4V alloy than air-oil-mist and dry cutting. 展开更多
关键词 green machining Ti-6Al-4V alloy chip formation high speed milling nitrogen gas
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FINITE ELEMENT ANALYSIS FOR CHIP FORMATION IN HIGH SPEED TURNING OPERATIONS BY ARBITRARY LAGRANGIAN EULERIAN METHOD 被引量:2
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作者 USAMA Umer 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第4期480-482,共3页
A two-dimensional finite element (FE) model for the high speed turning operations when orthogonally machining AISI H13 tool steel at 49HRC using poly crystalline cubic boron nitride (PCBN) is described. An arbitra... A two-dimensional finite element (FE) model for the high speed turning operations when orthogonally machining AISI H13 tool steel at 49HRC using poly crystalline cubic boron nitride (PCBN) is described. An arbitrary Lagrangian Eulerian (ALE) method has been adopted which does not need any chip separation criteria as opposed to the traditional Lagrangian approach. Through FE simulations temperature and stresses distributions are presented that could be helpful in predicting tool life and improving process parameters. The results show that high temperatures are generated along the tool rake face as compared to the shear zone temperatures due to high thermal conductivity of PCBN tools. 展开更多
关键词 chip formation Finite element(FE) Arbitrary Lagrangian Eulerian (ALE)
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Finite element simulation of chip formation in peripheral milling mild carbon steel
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作者 邓文君 夏伟 +2 位作者 李元元 邵明 张卫文 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2005年第6期715-720,共6页
A two-dimensional coupled thermo-mechanical model is used to simulate the progress of milling mild carbon steel with continuous chip formation. Deformation of the workpiece is treated as elastic-plastic with isotropic... A two-dimensional coupled thermo-mechanical model is used to simulate the progress of milling mild carbon steel with continuous chip formation. Deformation of the workpiece is treated as elastic-plastic with isotropic strain-hardening. An analysis of the properties of temperature-dependent materials is employed. The chip separation is achieved by the adaptive remeshing strategy module found in commercial finite element code Marc. In order to increase the computational efficiency and accuracy, we implement a customized subroutine into the Marc code to define local refinement at the tool tip. Measurements are taken of the shape of the chip, the temperature, stress, strain and strain-rate fields. The values of the cutting forces obtained from the simulations agree well with those obtained from the cutting experiments. 展开更多
关键词 MILLING thermo-mechanical coupling finite element method chip formation
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Chip Formation in Micro-cutting
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作者 Franqois Ducobu Edouard Rivi~re-Lorph~vre Enrico Filippi 《Journal of Mechanics Engineering and Automation》 2013年第7期441-448,共8页
The miniaturisation context leads to the rise of micro-machining processes. Micro-milling is one of the most flexible and fast of them. Although it is based on the same principles as macro-cutting, it is not a simple ... The miniaturisation context leads to the rise of micro-machining processes. Micro-milling is one of the most flexible and fast of them. Although it is based on the same principles as macro-cutting, it is not a simple scaling-down of it. This down-sizing involves new phenomena in the chip formation, such as the minimum chip thickness below which no chip is formed. This paper presents a review of the current state of the art in this field from an experimental and a numerical point of view. A 2D finite element model is then developed to study the influence of the depth of cut on the chip formation. After the model validation in macro-cutting, it highlights the phenomena reported in literature and allows to perform a minimum chip thickness estimation. 展开更多
关键词 chip formation MICRO-CUTTING minimum chip thickness orthogonal cutting saw-toothed chip Ti6AI4V.
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CHIP FORMATION MODEL OF TITANIUM ALLOYS
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作者 何宁 潘良贤 王珉 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 1998年第2期60-64,共5页
The chip deformation of titanium alloys is typical shear localization from low cutting speed, which is general phenomenon in machining of difficult to cut material at high cutting speed. This paper investigates the ... The chip deformation of titanium alloys is typical shear localization from low cutting speed, which is general phenomenon in machining of difficult to cut material at high cutting speed. This paper investigates the chip formation process in machining titanium alloys, and puts forward a three stage model describing formation process of shear localized chip. This model explains how the shear localized chip segments initiate, become trapezoid and form serrated chips. 展开更多
关键词 metal cutting chip formation titanium alloys shear localization
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Chip formation dependence of machining velocities in nano-scale by molecular dynamics simulations 被引量:5
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作者 SU Hao TANG Qi Heng 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第12期2426-2433,共8页
In this study, molecular dynamics simulations were carried out to study the effect of machining velocities on the mechanism of chip formation in nano-metric copper. A wide range of cutting velocities was performed fro... In this study, molecular dynamics simulations were carried out to study the effect of machining velocities on the mechanism of chip formation in nano-metric copper. A wide range of cutting velocities was performed from 10 to 2000 m/s, and the microstructure's evolution from a crystalline state to an amorphous state was studied. At the low machining velocity, dislocations were generated from the surface in front of the tool, and the immobile dislocation deduced by the cross slip of dislocation was observed. At the high machining velocity, no crystal dislocation nucleated, but instead disorder atoms were found near the tool. Temperature near the tool region increased with the increasing machining velocities, and the temperature had an important effect on the phase transition of the crystal structure. 展开更多
关键词 molecular dynamics chip formation machining velocities phase transition
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Experimental investigation of tool wear and chip formation in cryogenic machining of titanium alloys 被引量:5
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作者 D. Biermann H. Abrahams M. Metzger 《Advances in Manufacturing》 SCIE CAS CSCD 2015年第4期292-299,共8页
Titanium alloys are one of the most important design materials for the aircraft industry. The high strength-to-density-ratio and the compatibility with carbon fibre reinforced plastic are the reasons for a raising app... Titanium alloys are one of the most important design materials for the aircraft industry. The high strength-to-density-ratio and the compatibility with carbon fibre reinforced plastic are the reasons for a raising application in this field. The outstanding properties lead to challenging machining processes. High strength and low heat conductivity affect high mechanical and thermal loads for the cutting edge. Thus, the machining process is characterized by a rapid development of tool wear even at low cutting parameter. To reach a sufficient productivity it is necessary to dissipate the resulting heat from the cutting edge by a coolant. Therefore the cryogenic machining of two different titanium alloys is investigated in this work. The results point out the different behavior of the machining processes under cryogenic conditions because of the reduced thermal load for the cutting tool. According to this investigation, the cryogenic cooling with COa enables an increase of the tool life in comparison to emulsion based cooling principles when machining the α+β-titanium alloy Ti-6Al-4V. The machining process of the high strength titanium alloy Ti-6Al-2Sn-4Zr-6Mo requires an additional lubrication realized by a minimum quantity lubrication (MQL) with oil. This combined cool- ing leads to a smoother chip underside and to slender shear bands between the different chip segments. 展开更多
关键词 Titanium alloys . Cryogenic cooling Machining . Tool wear - chip formation
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Finite element analysis of chip formation and residual stresses induced by sequential cutting in side milling with microns to sub- micron uncut chip thickness and finite cutting edge radius 被引量:1
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作者 Nejah Tounsi Tahany EI-Wardany 《Advances in Manufacturing》 SCIE CAS CSCD 2015年第4期309-322,共14页
In this paper, the effect of four sequential cuts in side milling of Ti6Al4V on chip formation and residual stresses (RS) are investigated using finite element method (FEM). While the open literature is limited ma... In this paper, the effect of four sequential cuts in side milling of Ti6Al4V on chip formation and residual stresses (RS) are investigated using finite element method (FEM). While the open literature is limited mainly to the studies of orthogonal sequential cutting with the constant uncut chip thickness greater than 0.01 mm, it is suggested herein to investigate not only the variable uncut chip thickness which characterises the down milling process, but also the uncut chip thickness in the sub-micron range using a finite cutting edge radius. For the resulting ductile machining regime, the characteristics of the chip mor- phology, the force profiles, the plastic deformation and temperature distributions have been analyzed. Furthermore, this study revealed that the RS should be extracted toward the area where the insert exits the workpiece in the FE simulation of the down-milling process. The simulation of a number of sequential cuts due to the consecutive engagements of the insert is required in order to capture the gradual accumulation of the RS before reaching an asymptotic convergence of the RS profile. The predicted RS are in reasonable agreement with the experimental results. 展开更多
关键词 Finite element method (FEM) Down milling - Sequential cuts Ductile machining regime chip formation Residual stresses (RS)
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Numerical study via total Lagrangian smoothed particle hydrodynamics on chip formation in micro cutting 被引量:1
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作者 Jin-Shi Wang Xiao-Dong Zhang Feng-Zhou Fang 《Advances in Manufacturing》 SCIE CAS CSCD 2020年第2期144-159,共16页
Numerical simulation is an effective approach in studying cutting mechanism.The widely used methods for cutting simulation include finite element analysis and molecular dynamics.However,there exist some intrinsic shor... Numerical simulation is an effective approach in studying cutting mechanism.The widely used methods for cutting simulation include finite element analysis and molecular dynamics.However,there exist some intrinsic shortcomings when using a mesh-based formulation,and the capable scale of molecular dynamics is extremely small.In contrast,smoothed particle hydrodynamics(SPH)is a candidate to combine the advantages of them.It is a particle method which is suitable for simulating the large deformation process,and is formulated based on continuum mechanics so that large scale problems can be handled in principle.As a result,SPH has also become a main way for the cutting simulation.Since some issues arise while using conventional SPH to handle solid materials,the total Lagrangian smoothed particle hydrodynamics(TLSPH)is developed.But instabilities would still occur during the cutting,which is a critical issue to resolve.This paper studies the effects of TLSPH settings and cutting model parameters on the numerical instability,as well as the chip formation process.Plastic deformation,stress field and cutting forces are analyzed as well.It shows that the hourglass coefficient,critical pairwise deformation and time step are three important parameters to control the stability of the simulation,and a strategy on how to adjust them is provided. 展开更多
关键词 CUTTING Total Lagrangian smoothed particle hydrodynamics(TLSPH) Numerical instability chip formation
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Dynamics of chip formation during the cutting process using imaging techniques: A review 被引量:2
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作者 Guangchao Nie Zhengyan Yang +3 位作者 Dong Zhang Xiaoming Zhang José Outeiro Han Ding 《International Journal of Mechanical System Dynamics》 2022年第1期27-49,共23页
Imaging techniques have been widely implemented to study the dynamics of chip formation.They can offer a direct method and a full field measurement of the cutting process,providing kinematic information of the chip fo... Imaging techniques have been widely implemented to study the dynamics of chip formation.They can offer a direct method and a full field measurement of the cutting process,providing kinematic information of the chip formation process.In this article,the state of the art of the imaging techniques reported in the literature has been summarized and analyzed.The imaging techniques have been applied to study the chip formation mechanism,friction behavior,strain/strain rate,and stress fields.Furthermore,the study of surface integrity has been advanced by deriving the thermo‐mechanical loading,subsurface deformation,and material constitutive model from the imaging technique.Finally,achievements in the area of imaging techniques have been summarized,followed by future directions for their application in the study of surface integrity. 展开更多
关键词 chip formation imaging techniques strain rate STRESS surface integrity
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Stability of turning processes for periodic chip formation
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作者 Gergely Gyebrószki Daniel Bachrathy +1 位作者 Gábor Csernák Gabor Stepan 《Advances in Manufacturing》 SCIE CAS CSCD 2018年第3期345-353,共9页
The prediction of chatter vibration is influencedby many known complex phenomena and is uncertain. Wepresent a new effect that can significantly change the sta-bility properties of cutting processes. It is shown that ... The prediction of chatter vibration is influencedby many known complex phenomena and is uncertain. Wepresent a new effect that can significantly change the sta-bility properties of cutting processes. It is shown that themicroscopic environment of chip formation can have alarge effect on its macroscopic properties. In this work, acombined model of the surface regeneration effect and chipformation is used to predict the stability of turning pro-cesses. In a chip segmentation sub-model, the primaryshear zone is described with a corresponding materialmodel along layers together with the thermodynamicbehavior. The surface regeneration is modeled by the time-delayed differential equation. Numerical simulations showthat the time scale of a chip segmentation model is sig-nificantly smaller than the time scale of the turning process;therefore, averaging methods can be used. Chip segmen-tation can decrease the average shear force leading todecreased cutting coefficients because of the non-lineareffects. A proper linearization of the equation of motionleads to an improved description of the cutting coefficients.It is shown that chip segmentation may significantlyincrease the stable domains in the stability charts; fur-thermore, by selecting proper parameters, unbounded sta-bility domains can be reached. 展开更多
关键词 chip formation Chatter Turning delay
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Experimental Investigation of Material Removal in Elliptical Vibration Cutting of Cortical Bone
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作者 Wei Bai Yuhao Zhai +5 位作者 Jiaqi Zhao Guangchao Han Linzheng Ye Xijing Zhu Liming Shu Dong Wang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2023年第2期106-115,共10页
To benefit tissue removal and postoperative rehabilitation,increased efficiency and accuracy and reduced operating force are strongly required in the osteotomy.A novel elliptical vibration cutting(EVC)has been introdu... To benefit tissue removal and postoperative rehabilitation,increased efficiency and accuracy and reduced operating force are strongly required in the osteotomy.A novel elliptical vibration cutting(EVC)has been introduced for bone cutting compared with conventional cutting(CC)in this paper.With the assistance of high-speed microscope imaging and the dynamometer,the material removals of cortical bone and their cutting forces from two cutting regimes were recorded and analysed comprehensively,which clearly demonstrated the chip morphology improvement and the average cutting force reduction in the EVC process.It also revealed that the elliptical vibration of the cutting tool could promote fracture propagation along the shear direction.These new findings will be of important theoretical and practical values to apply the innovative EVC process to the surgical procedures of the osteotomy. 展开更多
关键词 Elliptical vibration cutting Cortical bone Material removal chip formation chip morphology Fracture propagation Cutting force OSTEOTOMY
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3D finite element prediction of chip flow, burr formation, and cutting forces in micro end-milling of aluminum 6061-T6 被引量:2
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作者 A. DAVOUDINEJAD P. PARENTI M. ANNONI 《Frontiers of Mechanical Engineering》 SCIE CSCD 2017年第2期203-214,共12页
Abstract Predictive models for machining operations have been significantly improved through numerous methods in recent decades. This study proposed a 3D finite element modeling (3D FEM) approach for the micro end-m... Abstract Predictive models for machining operations have been significantly improved through numerous methods in recent decades. This study proposed a 3D finite element modeling (3D FEM) approach for the micro end-milling orAl6061-T6. Finite element (FE) simulations were performed under different cutting conditions to obtain realistic numerical predictions of chip flow, burr formation, and cutting forces. FE modeling displayed notable advantages, such as capability to easily handle any type of tool geometry and any side effect on chip formation, including thermal aspect and material property changes. The proposed 3D FE model considers the effects ofmiU helix angle and cutting edge radius on the chip. The prediction capability of the FE model was validated by comparing numerical model and experimental test results. Burr dimension trends were correlated with force profile shapes. However, the FE predictions overestimated the real force magnitude. This overestimation indicates that the model requires further development. 展开更多
关键词 3D finite element modeling micro end-milling cutting force chip formation burr formation
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Effect of Radial Depth on Vibration and Surface Roughness During Face Milling of Austenitic Stainless Steel 被引量:1
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作者 申阳 陈永洁 +7 位作者 张俐 方海涛 庞佳 刘敏 王社权 马晓魁 张京 刘志林 《Transactions of Tianjin University》 EI CAS 2011年第5期336-339,共4页
This paper studies the influence of radial depth on vibration, chip formation and surface roughness during face milling of AISl3O4 austenitic stainless steel with indexable cemented carbide milling cutters. The amplit... This paper studies the influence of radial depth on vibration, chip formation and surface roughness during face milling of AISl3O4 austenitic stainless steel with indexable cemented carbide milling cutters. The amplitude of vibration acceleration increased with the increasing radial depth up to 80 mm. And the domain vibration frequency varied with the radial depth. In this paper, three types of chips were found: C shape, long shape and spiral shape. The minimum surface roughness value occurred when the radial depth equalled 40 mm in the experiment. Irregular changes of chip curl radius and chip thickness could be attributed to different numbers of alternately engaged teeth when the feed and speed were fixed. Surface roughness is related to forced vibration and chip formation. Radial depth with different numbers of alternately engaged teeth could significantly influence the forced vibration, chip formation, and surface roughness. 展开更多
关键词 austenitic stainless steel face milling radial depth VIBRATION surface roughness chip formation
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Cutting Behavior of Cortical Bone in Different Bone Osteon Cutting Angles and Depths of Cut
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作者 Yuanqiang Luo Yinghui Ren +3 位作者 Yang Shu Cong Mao Zhixiong Zhou Z.M.Bi 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2022年第3期80-91,共12页
Cortical bone is semi-brittle and anisotropic,that brings a challenge to suppress vibration and avoid undesired fracture in precise cutting process in surgeries.In this paper,a novel analytical model is proposed to re... Cortical bone is semi-brittle and anisotropic,that brings a challenge to suppress vibration and avoid undesired fracture in precise cutting process in surgeries.In this paper,a novel analytical model is proposed to represent cortical bone cutting processes.The model is utilized to predict the chip formations,material removal behavior and cracks propagation under varying bone osteon cutting angles and depths.Series of orthogonal cutting experiments were conducted on cortical bone to investigate the impact of bone osteon cutting angle and depth of cut on cutting force,crack initialization and propagation.The observed chip morphology highly agreed with the prediction of chip formation based on the analytical model.The curly,serrated,grainy and powdery chips formed when the cutting angle was set as 0°,60°,90°,and 120°,respectively.Cortical bone were removed dominantly by shearing at a small depth of cut from 10 to 50μm,and by a mixture of pealing,shearing,fracture and crushing at a large depth of cut over 100μm at different bone osteon angles.Moreover,its fracture toughness was calculated based on measured cutting force.It is found that the fluctuation of cutting force is suppressed and the bone material becomes easy to remove,which attributes to lower fracture toughness at bone osteon cutting angle 0°.When the cutting direction develops a certain angle to bone osteon,the fracture toughness increases then the crack propagation is inhibited to some extent and the fluctuation of cutting force comparatively decreases.There is a theoretical and practical significance for tools design and operational parameters choice in surgeries. 展开更多
关键词 Bone cutting surgery Orthogonal cutting models Anisotropic materials chip formation Crack initialization and propagation Fracture toughness
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Modeling of workpiece temperature suppression in high-speed dry milling of UD-CF/PEEK considering heat partition and jet heat transfer
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作者 Lei LIU Da QU +3 位作者 Jin ZHANG Huajun CAO Guibao TAO Chenjie DENG 《Frontiers of Mechanical Engineering》 SCIE CSCD 2024年第5期87-109,共23页
High-performance carbon fiber-reinforced polyether-ether-ketone(CF/PEEK)has been gradually applied in aerospace and automobile applications because of its high strength-to-weight ratio and impact resistance.The drymac... High-performance carbon fiber-reinforced polyether-ether-ketone(CF/PEEK)has been gradually applied in aerospace and automobile applications because of its high strength-to-weight ratio and impact resistance.The drymachining requirement tends to cause the cutting temperature to surpass the glass transition temperature(Tg),leading to poor surface quality,which is the bottleneck for dry milling of CF/PEEK.Temperature suppression has become an important breakthrough in the feasibility of high-speed dry(HSD)milling of CF/PEEK.However,heat partitioning and jet heat transfer mechanisms pose strong challenges for temperature suppression analytical modeling.To address this gap,an innovative temperature suppression analytical model based on heat partitioning and jet heat transfer mechanisms is first developed for suppressing workpiece temperature via the first-time implementation of an air jet cooling process in the HSD milling of UD-CF/PEEK.Then,verification experiments of the HSD milling of UD-CF/PEEK with four fiber orientations are performed for dry and air jet cooling conditions.The chip morphologies are characterized to reveal the formation mechanism and heat-carrying capacity of the chip.The milling force model can obtain the force coefficients and the total cutting heat.The workpiece temperature increase model is validated to elucidate the machined surface temperature evolution and heat partition characteristics.On this basis,an analytical model is verified to predict the workpiece temperature of air jet cooling HSD milled with UD-CF/PEEK with a prediction accuracy greater than 90%.Compared with those under dry conditions,the machined surface temperatures for the four fiber orientations decreased by 30%–50%and were suppressed within the Tg range under air jet cooling conditions,resulting in better surface quality.This work describes a feasible process for the HSD milling of CF/PEEK. 展开更多
关键词 thermoplastic CF/PEEK high-speed dry milling chip formation heat partition jet heat transfer temperature suppression
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Microstructure evaluation of shear bands of microcutting chips in AA6061 alloy under the mechanochemical effect 被引量:2
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作者 Jiayi Zhang Yan Jin Lee Hao Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第32期178-186,共9页
The mechanochemical effect on the microcutting of AA6061 alloy is studied through characterization on the chip. A pronounced reduction of machining forces and chip thickness was observed with mechanochemical effect du... The mechanochemical effect on the microcutting of AA6061 alloy is studied through characterization on the chip. A pronounced reduction of machining forces and chip thickness was observed with mechanochemical effect during microcutting. Furthermore, electron backscattered diffraction(EBSD) and transmission electron microscopy(TEM) observations were performed on the chips and shear bands. The result reveals much coarser grains(24.6 μm in size) in the surfactant-affected chip than that in the surfactant-free chip(13.5 μm). Different grain orientations are induced by microcutting. {100}<001> and{110}<112> grain orientations are majority for surfactant-free chip, and {110}<001> and {100}<110>dominate most for all grain orientations for surfactant-affected chip. Additionally, since less localized shear strain and lower temperature are generated inside the shear band with mechanochemical effect,almost no recrystallization phenomena can be observed in this region. TEM analysis shows that fewer subgrains and dislocations could be observed inside the shear band of the surfactant-affected chip in comparison with the surfactant-free chip. Based on the high-resolution transmission electron microscopic(HRTEM) observations, dislocations were observed at the atomic scale. The results show that the main dislocation motion mode in shear bands of surfactant-free and surfactant-affected chips are dislocation climb and dislocation glide, respectively. 展开更多
关键词 Mechanochemical effect Microcutting Shear band chip formation DISLOCATION
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Feasibility study of creep feed grinding of 300M steel with zirconium corundum wheel 被引量:3
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作者 Jiaqiang DANG Heng ZANG +2 位作者 Qinglong AN Weiwei MING Ming CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第3期565-578,共14页
The ultrahigh strength 300M steel has been commonly used in the manufacture of aircraft landing gear and rotor shaft parts due to its excellent mechanical properties.Creep feed grinding is one of the essential operati... The ultrahigh strength 300M steel has been commonly used in the manufacture of aircraft landing gear and rotor shaft parts due to its excellent mechanical properties.Creep feed grinding is one of the essential operations during the whole component manufacturing processes.In this work,the feasibility of creep feed grinding of 300M steel by using the hard zirconium corundum wheel was theoretically and experimentally evaluated.A variety of responses including grinding forces,temperature fields,specific grinding energy,surface integrity and chip modes were carefully recorded.Besides,the mechanism of ground surface profile generation and the spatial frequency spectrum of the surface profile were tentatively analyzed.It was found that the wheel speed has a relative influence on the grinding forces and temperatures of which the work hardening effect dominates the material removal with lower wheel speed while the thermal softening becomes crucial as the wheel speed exceeds the critical value for the studied 300M steel.Furthermore,a scattered spatial frequency spectrum for the generated surface profile was noticed with lower wheel speed while the spectrum gathers towards the lower frequency values with higher amplitude as the wheel speed increases.The shearing chip and flowing chip dominates the main chip type,indicating the excellent abrasive sharpness during the grinding process.In general,the used zirconium corundum wheel presents feasibility for the creep feed grinding of 300M steel because of the high material removal rate,absence of surface burn,low wheel wear and higher compressive residual stresses. 展开更多
关键词 300M steel chip formation Creep feed grinding Surface morphology Zirconium corundum wheel
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