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Investigation on tool wear and tool life prediction in micro-milling of Ti-6Al-4V

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Nanotechnology and Precision Engineering 2018年第4期1卷 218-225页

作者： Amin Dadgari dehong huo David Swailes Mechanical Engineering School of Engineering Newcastle UniversityNewcastle upon Tyne NE1 7RU UK School of Mathematics Statistics and Physics Newcastle UniversityNewcastle upon Tyne NE1 7RU UK

Short tool life and rapid tool wear in micromachining of hard-to-machine materials remain a barrier to the process being economically viable. In this study, standard procedures and conditions set by the ISO for tool life testing in milling were used to analyze the wear of tungsten carbide micro-end-milling tools through slot milling conducted on titanium alloy Ti-6 Al-4 V. Tool wear was characterized by flank wear rate,cutting-edge radius change, and tool volumetric change. The effect of machining parameters, such as cutting speed and feedrate, on tool wear was investigated with reference to surface roughness and geometric accuracy of the finished workpiece. Experimental data indicate different modes of tool wear throughout machining, where nonuniform flank wear and abrasive wear are the dominant wear modes. High cutting speed and low feedrate can reduce the tool wear rate and improve the tool life during ***, the low feedrate enhances the plowing effect on the cutting zone, resulting in reduced surface quality and leading to burr formation and premature tool failure. This study concludes with a proposal of tool rejection criteria for micro-milling of Ti-6 Al-4 V.

关键词： micro-milling tool wear tool life flank wear titanium alloy surface roughness

Integrated Simulation Method for Interaction between Manufacturing Process and Machine Tool

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Chinese Journal of Mechanical Engineering 2016年第6期29卷 1090-1095页

作者： CHEN Wanqun huo dehong XIE Wenkun TENG Xiangyu ZHANG Jiayi School of Mechanical and Systems Engineering Newcastle University Center for Precision Engineering Harbin Institute of Technology

The interaction between the machining process and the machine tool （IMPMT） plays an important role on high precision components manufacturing. However, most researches are focused on the machining process or the machine tool separately, and the interaction between them has been always overlooked. In this paper, a novel simplified method is proposed to realize the simulation of IMPMT by combining use the finite element method and state space method. In this method, the transfer function of the machine tool is built as a small state space. The small state space is obtained from the complicated finite element model of the whole machine tool. Furthermore, the control system of the machine tool is integrated with the transfer function of the machine tool to generate the cutting trajectory. Then, the tool tip response under the cutting force is used to predict the machined surface. Finally, a case study is carried out for a fly-cutting machining process, the dynamic response analysis of an ultra-precision fly-cutting machine tool and the machined surface verifies the effectiveness of this method. This research proposes a simplified method to study the IMPMT, the relationships between the machining process and the machine tool are established and the surface generation is obtained.

关键词： dynamic analysis state space surface generation machining interaction precision machining

Dynamic performance of a long-stroke fast tool servo system

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Nanotechnology and Precision Engineering 2022年第2期5卷 38-53页

作者： Zheng Gong dehong huo Zengyuan Niu Wanqun Chen Kai Cheng School of Engineering Newcastle UniversityNewcastle upon Tyne NE17RUUnited Kingdom UPTech Jiangsu Industrial Technology Research InstituteKunshan 215300China School of Electromechanical Engineering Soochow UniversitySoochow 215031China School of Engineering and Design Brunel University LondonLondon UB83PHUnited Kingdom

A fast tool servo(FTS)system can be used to efficiently manufacture optical freeform *** paper investigates the dynamic performance of an FTS system driven by a voice coil motor and guided by air bearings.A simulation model and testing platform are developed to evaluate the load capacity and stiffness of the air *** mechanical dynamic performance of the designed FTS,including modal and harmonic analyses,is assessed using finite element analysis.A nonlinear relation between air-bearing stiffness and mechanical bandwidth is *** working dynamic performance is tested through system runout,tracking performance,and closed-loop *** relations between air-bearing stiffness and the mechanical and working bandwidths are established and *** experiments verify the feasibility of the FTS system with 31.05 N/μm stiffness air-bearings.

关键词： FTS Dynamic performance Air bearing Stiffness

Performance Improvement of the LM Device and Its Application to Precise Measurement of Motion Trajectories within a Small Range with a Machining Centre

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Modern Mechanical Engineering 2012年第3期2卷 71-85页

作者： Hua Qiu Yong Yue Akio Kubo Chao Lin Kai Cheng dehong huo Dayou Li 1Department of Mechanical Engineering Faculty of Engineering Kyushu Sangyo University Fukuoka City Japan Advanced Manufacturing and Enterprise Engineering Department School of Engineering and Design Brunel University Uxbridge UK Department of Computer Science and Technology University of Bedfordshire Luton UK Department of Mechanical Engineering Faculty of Engineering Kyushu Sangyo University Fukuoka City Japan Product Design and Engineering Department School of Engineering and Information Sciences Middlesex University London UK State Key Laboratory of Mechanical Transmission Chongqing University Chongqing China

In order to apply the LM device previously developed to precisely measuring small motion trajectories located on the different motion planes, three major improvements are successfully performed under the condition of completely maintaining the advantages of the device. These improvements include 1) development of a novel connection mechanism to smoothly attach the device to the spindle of a machining centre;2) employment of a new data sampling method to achieve a high sampling frequency independent of the operating system of the control computer;and 3) proposal of a set-up method to conveniently install the device on the test machining centre with respect to different motion planes. Practical measurement experiment results with the improved device on a machining centre sufficiently demonstrate the effectiveness of the improvements and confirm several features including a very good response to small displacement close to the resolution of the device, high precision, repeatability and reliance. Moreover, based on the measurement results for a number of trajectories for a wide range of motion conditions, the error characteristics of small size motions are systematically discussed and the effect of the movement size and feed rate on the motion accuracy is verified for the machining centre tested.

关键词： Motion Accuracy Measurement Device Performance Improvement Small Size Motion Machining Centre

非晶态合金的零件成形加工技术与形变机理分析

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高技术通讯 2014年第11期24卷 1176-1186页

作者：赵岩魏勋利张艳霍德鸿燕山大学机械工程学院秦皇岛066004 纽卡斯尔大学机械与系统工程学院纽卡斯尔英国NE17RU

简述了新型工程材料——非晶态合金独特的长程无序、短程有序的微观结构,以及由此带来的有重要应用价值的力学、物理及化学性能和成形加工上的难度,在此基础上系统地综述了现阶段国内外四类主要的非晶态合金零件成形加工技术即切削加工... 详细信息

简述了新型工程材料——非晶态合金独特的长程无序、短程有序的微观结构,以及由此带来的有重要应用价值的力学、物理及化学性能和成形加工上的难度,在此基础上系统地综述了现阶段国内外四类主要的非晶态合金零件成形加工技术即切削加工、特种加工、超塑性加工及焊接拼合的特点及现状;阐述了非晶态合金的重要的结构特征——自由体积的概念和作用;从局部剪切带、牛顿黏性流动以及原子跃迁的角度分析了非晶态合金加工过程中的形变物理机制;最后从工程应用的角度指出了非晶态合金加工研究今后需要解决的技术问题。

关键词：非晶态合金(金属玻璃) 剪切区绝热温升超塑性屈服准则

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金属玻璃切削加载的形变屈服准则与实验验证

高技术通讯 2017年第3期27卷 285-293页

作者：张艳王咏萱赵岩王加春卢金平霍德鸿燕山大学机械工程学院秦皇岛066004 纽卡斯尔大学机械与系统工程学院

以金属玻璃切削过程中的屈服形变为研究对象,引入源于岩土领域的M-C屈服准则来解决传统Treaca准则及Mises准则不能反映金属玻璃的应力敏感性问题。另外鉴于金属玻璃的温度敏感特性以及切削加工时较高的切削温升,将经过温度修正的改进型... 详细信息

以金属玻璃切削过程中的屈服形变为研究对象,引入源于岩土领域的M-C屈服准则来解决传统Treaca准则及Mises准则不能反映金属玻璃的应力敏感性问题。另外鉴于金属玻璃的温度敏感特性以及切削加工时较高的切削温升,将经过温度修正的改进型M-C屈服准则应用于金属玻璃的切削模型之中。切削力实验表明,基于传统屈服准则、不含温度项的M-C屈服准则以及经过温度修正的M-C屈服准则所建立的切削力模型中,后者的解析解与切削力实测值相比误差最小(平均误差8.92%),说明经过温度修正的M-C屈服准则可以较好地反映金属玻璃切削加载的切削力及材料形变过程,为后续金属玻璃切削机理的深入研究奠定了理论基础。

关键词：金属玻璃屈服形变屈服准则切削力温度修正

Strong interlayer magnetic exchange coupling in La_(3)Ni_(2)O_(7-δ)revealed by inelastic neutron scattering

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Science Bulletin 2024年第20期69卷 3221-3227页

作者： Tao Xie Mengwu huo Xiaosheng Ni Feiran Shen Xing Huang Hualei Sun Helen C.Walker Devashibhai Adroja dehong Yu Bing Shen Lunhua He Kun Cao Meng Wang Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China Spallation Neutron Source Science Center Dongguan 523803China School of Science Sun Yat-sen UniversityShenzhen 518107China ISIS Neutron and Muon Source Science and Technology Facilities CouncilRutherford Appleton LaboratoryDidcot OX110QXUnited Kingdom Australian Nuclear Science and Technology Organisation Lucas Heights 2234Australia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

After several decades of studies of high-temperature superconductivity,there is no compelling theory for the mechanism yet;however,the spin fluctuations have been widely believed to play a crucial role in forming the superconducting Cooper *** recent discovery of high-temperature superconductivity near 80 K in the bilayer nickelate La_(3)Ni_(2)O_(7)under pressure provides a new platform to elucidate the origins of high-temperature *** perform elastic and inelastic neutron scattering studies on a polycrystalline sample of La_(3)Ni_(2)O_(7-δ)at ambient *** magnetic order can be identified down to 10 *** absence of long-range magnetic order in neutron diffraction measurements may be ascribed to the smallness of the magnetic ***,we observe a weak flat spin-fluctuation signal in the inelastic scattering spectra at~45 *** observed spin excitations could be interpreted as a result of strong interlayer and weak intralayer magnetic couplings for stripe-type antiferromagnetic *** results provide crucial information on the spin dynamics and are thus important for understanding the superconductivity in La_(3)Ni_(2)O_(7).

关键词： High-T_(c)superconductor Bilayer nickelate La_(3)Ni_(2)O_(7) Neutron scattering Spin excitations

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纳米改性制备温敏响应性柞蚕丝织物

丝绸 2022年第10期59卷 20-26页

作者：李佳王勃翔霍雨心郝旭刘治梅程德红辽东学院辽宁省功能纺织材料重点实验室辽宁丹东118003 辽东学院化工与机械学院辽宁丹东118003

为了使智能凝胶在纺织品功能整理中得到更好的应用,本文采用静电纺丝技术与互穿网络技术相结合,制备了一种壳聚糖季铵盐/聚-N异丙基丙烯酰胺/PEO纳米纤维,并将戊二醛作为交联剂,纳米纤维原位改性柞蚕丝织物,以赋予柞蚕丝织物温敏响应性... 详细信息

为了使智能凝胶在纺织品功能整理中得到更好的应用,本文采用静电纺丝技术与互穿网络技术相结合,制备了一种壳聚糖季铵盐/聚-N异丙基丙烯酰胺/PEO纳米纤维,并将戊二醛作为交联剂,纳米纤维原位改性柞蚕丝织物,以赋予柞蚕丝织物温敏响应性。采用傅里叶红外光谱、TG热分析、接触角、SEM测试技术分别测定改性后柞蚕丝织物的分子结构、热性能、亲疏水性及表面形态。实验结果表明,壳聚糖季铵盐/聚-N异丙基丙烯酰胺/PEO水凝胶具有良好的温敏性,相转变温度在32~33℃,与纺丝原液水凝胶TG分析结果相符合;柞蚕丝表面形成壳聚糖季铵盐/聚-N异丙基丙烯酰胺/PEO纳米纤维层,且纤维分布均匀;改性后柞蚕丝织物具有良好的亲疏水性转变,当温度高于45℃,温敏性柞蚕丝织物具有明显的疏水性。

关键词：智能材料壳聚糖季铵盐壳聚糖温敏响应性柞蚕丝织物互穿网络技术静电纺丝技术

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高海拔地区500kV紧凑型线路过电压及防雷特性

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高电压技术 2011年第1期37卷 57-61页

作者：赵建宁谷定燮霍锋曹晶戴敏武汉大学电气工程学院武汉430072 南方电网公司超高压局广州510600 国网电力科学研究院武汉430074

通过分析比较多种海拔修正方法,结合工程实际,研究了"德宏-博尚"500kV高海拔紧凑型输变电工程空气间隙绝缘水平的海拔修正,并推荐了适合该工程的绝缘水平海拔修正方法。进行了德宏-博尚紧凑型线路绝缘水平选择和可靠性分析,并给出了德... 详细信息

通过分析比较多种海拔修正方法,结合工程实际,研究了"德宏-博尚"500kV高海拔紧凑型输变电工程空气间隙绝缘水平的海拔修正,并推荐了适合该工程的绝缘水平海拔修正方法。进行了德宏-博尚紧凑型线路绝缘水平选择和可靠性分析,并给出了德博线紧凑型线路的最小空气间隙,包括塔头处的相地最小空气间隙以及档距中央导线之间的最小空气间隙。研究表明,德宏站线路侧断路器在装合闸电阻的条件下,操作过电压下的全线绝缘闪络率可以控制在允许范围内;杆塔冲击接地电阻为10Ω时,德博全线雷击跳闸率为0.102次/(100km.a),低于全国500kV线路平均雷击跳闸率。

关键词：高海拔紧凑型输电线路海拔修正过电压操作冲击跳闸率