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An electromagnetic semi-active dynamic vibration absorber for thin-walled workpiece vibration suppression in mirror milling
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作者 Jianghua KONG Bei DING +3 位作者 Wei WANG Zhixia WANG Juliang XIAO Hongyun QIU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2024年第8期1315-1334,共20页
As critical components of aircraft skins and rocket fuel storage tank shells,large thin-walled workpieces are susceptible to vibration and deformation during machining due to their weak local stiffness.To address thes... As critical components of aircraft skins and rocket fuel storage tank shells,large thin-walled workpieces are susceptible to vibration and deformation during machining due to their weak local stiffness.To address these challenges,we propose a novel tunable electromagnetic semi-active dynamic vibration absorber(ESADVA),which integrates with a magnetic suction follower to form a followed ESADVA(follow-ESADVA)for mirror milling.This system combines a tunable magnet oscillator with a follower,enabling real-time vibration absorption and condition feedback throughout the milling process.Additionally,the device supports self-sensing and frequency adjustment by providing feedback to a linear actuator,which alters the distance between magnets.This resolves the traditional issue of being unable to directly monitor vibration at the machining point due to space constraints and tool interference.The frequency shift characteristics and vibration absorption performance are comprehensively investigated.Theoretical and experimental results demonstrate that the prototyped follow-ESADVA achieves frequency synchronization with the milling tool,resulting in a vibration suppression rate of approximately 47.57%.Moreover,the roughness of the machined surface decreases by18.95%,significantly enhancing the surface quality.The results of this work pave the way for higher-quality machined surfaces and a more stable mirror milling process. 展开更多
关键词 semi-active dynamic vibration absorber(SADVA) mirror milling selfsensing vibration absorption tuning thin-walled workpiece
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Measurement Uncertainty Analysis of the Rotary-scan Method for the Measurable Dimension of Cylindrical Workpieces
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作者 Jiali Zhao Liang Zhang +2 位作者 Dan Wu Bobo Shen Qiaolin Li 《Instrumentation》 2024年第1期10-17,共8页
The measurement uncertainty analysis is carried out to investigate the measurable dimensions of cylindrical workpieces by the rotary-scan method in this paper.Due to the difficult alignment of the workpiece with a dia... The measurement uncertainty analysis is carried out to investigate the measurable dimensions of cylindrical workpieces by the rotary-scan method in this paper.Due to the difficult alignment of the workpiece with a diameter of less than 3 mm by the rotary scan method,the measurement uncertainty of the cylindrical workpiece with a diameter of 3 mm and length of 50 mm which is measured by a roundness measuring machine,is evaluated according to GUM(Guide to the Expression of Uncertainty in Measurement)as an example.Since the uncertainty caused by the eccentricity of the measured workpiece is different with the dimension changing,the measurement uncertainty of cylindrical workpieces with other dimensions can be evaluated the same as the diameter of 3 mm but with different eccentricity.Measurement uncertainty caused by different eccentricities concerning the dimension of the measured cylindrical workpiece is set to simulate the evaluations.Compared to the target value of the measurement uncertainty of 0.1μm,the measurable dimensions of the cylindrical workpiece can be obtained.Experiments and analysis are presented to quantitatively evaluate the reliability of the rotary-scan method for the roundness measurement of cylindrical workpieces. 展开更多
关键词 measurement uncertainty rotary-scan cylindrical workpiece various dimensions
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FEM analysis of workpiece curvature influence on groove deformation during plough process 被引量:2
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作者 陆龙生 刘晓辰 +1 位作者 汤勇 袁冬 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第7期1738-1743,共6页
To investigate the workpiece curvature influence on groove deformation,numerical studies with curvature varying from negative to positive were conducted on copper material.Groove deformations were analyzed,including g... To investigate the workpiece curvature influence on groove deformation,numerical studies with curvature varying from negative to positive were conducted on copper material.Groove deformations were analyzed,including groove geometry,effective stress distribution and plough force.The curled groove shape whose workpiece curvature was 0.133 mm-1 was validated by experiments.Moreover,a series of geometry models with various curvatures were introduced to analyze the change of groove deformation.The results show that positive curvatures influence groove deformation more intensively than negative or zero curvature.It is mainly due to the action of the tool forming face during plough process. 展开更多
关键词 PLOUGH workpiece curvature microgroove MICROCHANNEL finite element method
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WORKPIECE LOCATING AND POST PROCESSING SYSTEMS ON 6-DOF CNC MILLING MACHINE
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作者 王瑞 钟诗胜 王知行 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2006年第2期138-143,共6页
A conventional non-computerized numerical control (CNC) machine is updated by mounting a six degree-of-free (DOF) parallel mechanism on it, thus obtaining a new CNC one. The structure of this CNC milling machine i... A conventional non-computerized numerical control (CNC) machine is updated by mounting a six degree-of-free (DOF) parallel mechanism on it, thus obtaining a new CNC one. The structure of this CNC milling machine is introduced, and the workpiece locating system and the post processing system of the cutter location (CL) data file are analyzed. The new machine has advantages of low costs, simple structure, good rigidity, and high precision. It is easy to be transformed and used to process the workpiece with a complex surface. 展开更多
关键词 parallel kinematic machine CNC milling machine workpiece locating system post processing system
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Automatic Method for Synchronizing Workpiece Frames in Twin-robot Nondestructive Testing System 被引量:6
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作者 LU Zongxing XU Chunguang +2 位作者 PAN Qinxue MENG Fanwu LI Xinliang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第4期860-868,共9页
The workpiece frames relative to each robot base frame should be known in advance for the proper operation of twin-robot nondestructive testing system. However, when two robots are separated from the workpieces, the t... The workpiece frames relative to each robot base frame should be known in advance for the proper operation of twin-robot nondestructive testing system. However, when two robots are separated from the workpieces, the twin robots cannot reach the same point to complete the process of workpiece frame positioning. Thus, a new method is proposed to solve the problem of coincidence between workpiece frames. Transformation between two robot base frames is initiated by measuring the coordinate values of three non-collinear calibration points. The relationship between the workpiece frame and that of the slave robot base frame is then determined according to the known transformation of two robot base frames, as well as the relationship between the workpiece frame and that of the master robot base frame. Only one robot is required to actually measure the coordinate values of the calibration points on the workpiece. This requirement is beneficial when one of the robots cannot reach and measure the calibration points. The coordinate values of the calibration points are derived by driving the robot hand to the points and recording the values of top center point(TCP) coordinates. The translation and rotation matrices relate either the two robot base frames or the workpiece and master robot. The coordinated are solved using the measured values of the calibration points according to the Cartesian transformation principle. An optimal method is developed based on exponential mapping of Lie algebra to ensure that the rotation matrix is orthogonal. Experimental results show that this method involves fewer steps, offers significant advantages in terms of operation and time-saving. A method used to synchronize workpiece frames in twin-robot system automatically is presented. 展开更多
关键词 twin-robot system workpiece frame coordinate transformation matrix orthogonal Lie algebra
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Self-calibration and Compensation of Setting Errors for Surface Profile Measurement of a Microstructured Roll Workpiece 被引量:3
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作者 GAO Wei XU Bin +2 位作者 TAKEISHI Toshiki SHIMIZU Yuki ITO So 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2014年第1期14-22,共9页
Microstructured roll workpieces have been widely used as functional components in the precision industries. Current researches on quality control have focused on surface profile measurement of microstructured roll wor... Microstructured roll workpieces have been widely used as functional components in the precision industries. Current researches on quality control have focused on surface profile measurement of microstructured roll workpieces, and types of measurement systems and measurement methods have been developed. However, low measurement efficiency and low measurement accuracy caused by setting errors are the common disadvantages for surface profile measurement of microstructured roll workpieces. In order to shorten the measurement time and enhance the measurement accuracy, a method for self-calibration and compensation of setting errors is proposed for surface profile measurement of microstructured roll workpieces. A measurement system is constructed for the measurement, in which a precision spindle is employed to rotate the roll workpiece and an air-bearing displacement sensor with a micro-stylus probe is employed to scan the microstructured surface of the roll workpiece. The resolution of the displacement sensor is 0.14 nm and that of the rotary encoder of the spindle was 0.15r~. Geometrical and mathematical models are established for analyzing the influences of the setting errors of the roll workpiece and the displacement sensor with respect to the axis of the spindle, including the eccentric error of the roll workpiece, the offset error of the sensor axis and the zero point error of the sensor output. Measurement experiments are carded out on a roll workpiece on which periodic microstructures are a period of 133 i^m along the circumferential direction. Experimental results demonstrate the feasibility of the self-compensation method. The proposed method can be used to detect and compensate the setting errors without using any additional accurate artifact. 展开更多
关键词 measurement profile setting error SELF-CALIBRATION COMPENSATION microstructure roll workpiece
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DEVELOPMENT OF A 3-DOF MICRO-POSITIONING WORKPIECE TABLE 被引量:5
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作者 ZhangDawei TianYanling GaoYongsheng 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2004年第1期46-50,共5页
In order to achieve active grinding control, a novel numerical controlmicropositioning workpiece table with a resolution of 6 nm has been developed. The table is drivenby three piezoelectric actuators mounted on the b... In order to achieve active grinding control, a novel numerical controlmicropositioning workpiece table with a resolution of 6 nm has been developed. The table is drivenby three piezoelectric actuators mounted on the base. An elastic structure with three half-notchflexure hinges is designed to apply preload to the piezoelectric actuators. The position of flexurebinges is also elaborately designed with consideration to reduce the bending deformation of themoving part. Three capacitive sensors are used to form close loop control system. Considering thetable as a damped 3-DOF mass-spring system, the models of static and dynamic stiffness and errorowing to the action of external forces have been established. In order to make the table have highresolution and positioning accuracy, an error compensation algorithm is implemented by using theestablished models. The experimental testing has been carried out to verify the performance of theworkpiece table and the established models of the micropositioning workpiece table. 展开更多
关键词 Micropositioning workpiece table Piezoelectric actuator Flexure hinge
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THE INTEGRAL OF THE INVERSE FUNCTION OF φ FOR AN ANALYTICAL SOLUTION TO THE COMPRESSION OF A THIN WORKPIECE 被引量:2
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作者 Zhao, Dewen Northeast University of Technology, Shenyang 110006, China Fang, Youkang Institute fur Angewandte Mathematik Albert-Ludwigs Universitat, Hemann-Henter Str 10 7800 Freihurg.1. Br. BRD, Germany 《中国有色金属学会会刊:英文版》 CSCD 1993年第1期42-44,共3页
An analytical solution of the unit pressure on a thin workpiece under compression has been obtained by using the inverse function of φ to the integral integral from 0 to x φ dx. Its result is basically the same as t... An analytical solution of the unit pressure on a thin workpiece under compression has been obtained by using the inverse function of φ to the integral integral from 0 to x φ dx. Its result is basically the same as the prevailing numerical formula integral from 0 to x φdx=∑√<sub>1</sub>-Δx<sub>1</sub>. However, the new integral is simpler and more convenient to use. 展开更多
关键词 SLIP line field THIN workpiece INVERSE function analytical solution
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Application of the Controllable Quenching Technology to the Quenching and tempering Workpieces 被引量:2
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作者 Chen Nailu, Liao Bo, Niu Wanbin’, Slum Jin, Zhu Xiaoqian 1.Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450052,China 2.Department of Materials, University of Yanshan, Qinhuangdao 066004, China 《Journal of Shanghai Jiaotong university(Science)》 EI 2000年第1期156-160,共5页
In order to obtain the desired mechanical properties of quenching and tempering workpieces, as well as reduce the cracking tendency and distortion, a program of controllable quenching was established. Furthermore, a c... In order to obtain the desired mechanical properties of quenching and tempering workpieces, as well as reduce the cracking tendency and distortion, a program of controllable quenching was established. Furthermore, a computer-aided quenching system (CAQ) was also developed. The application samples of the CAQ system showed satisfactory results. 展开更多
关键词 QUENCHING QUENCHING and TEMPERING workpiece CAQ
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Milling Parameters Optimization of Al-Li Alloy Thin-Wall Workpieces Using Response Surface Methodology and Particle Swarm Optimization 被引量:2
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作者 Haitao Yue Chenguang Guo +2 位作者 Qiang Li Lijuan Zhao Guangbo Hao 《Computer Modeling in Engineering & Sciences》 SCIE EI 2020年第9期937-952,共16页
To improve the milling surface quality of the Al-Li alloy thin-wall workpieces and reduce the cutting energy consumption.Experimental research on the milling processing of AA2195 Al-Li alloy thin-wall workpieces based... To improve the milling surface quality of the Al-Li alloy thin-wall workpieces and reduce the cutting energy consumption.Experimental research on the milling processing of AA2195 Al-Li alloy thin-wall workpieces based on Response Surface Methodology was carried out.The single factor and interaction of milling parameters on surface roughness and specific cutting energy were analyzed,and the multi-objective optimization model was constructed.The Multiobjective Particle Swarm Optimization algorithm introducing the Chaos Local Search algorithm and the adaptive inertial weight was applied to determine the optimal combination of milling parameters.It was observed that surface roughness was mainly influenced by feed per tooth,and specific cutting energy was negatively correlated with feed per tooth,radial cutting depth and axial cutting depth,while cutting speed has a non-significant influence on specific cutting energy.The optimal combination of milling parameters with different priorities was obtained.The experimental results showed that the maximum relative error of measured and predicted values was 8.05%,and the model had high reliability,which ensured the low surface roughness and cutting energy consumption.It was of great guiding significance for the success of Al-Li alloy thin-wall milling with a high precision and energy efficiency. 展开更多
关键词 Al-Li alloy thin-wall workpieces response surface methodology surface roughness specific cutting energy multi-objective particle swarm optimization algorithm
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Hot spinning of cylindrical workpieces of TA15 titanium alloy 被引量:1
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作者 XU Wenchen,SHAN Debin,YANG Guoping,CHEN Yu,LU Yan,and KANG Dachang School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China 《Rare Metals》 SCIE EI CAS CSCD 2007年第S1期255-261,共7页
In order to form large-diameter thin-wall cylindrical workpieces of TA15 titanium alloy,tube hot spinning experiments of the alloy were conducted on a CNC hot spinning machine.The causes of some forming defects occuri... In order to form large-diameter thin-wall cylindrical workpieces of TA15 titanium alloy,tube hot spinning experiments of the alloy were conducted on a CNC hot spinning machine.The causes of some forming defects occuring in hot spinning,such as crack,pileup,bulge and corrugation,were analyzed and the corresponding measures were put forward to avoid spinning defects,based on which a proper process scheme of hot spinning of TA15 alloy was obtained and the large-diameter and thin-walled cylindrical workpieces were formed with good quality.The results show that spinning temperature has distinct influence on forming quality of spun workpieces.The range of spinning temperature determines the spinnability of titanium alloy and the ununiformity of temperature distribution near the deformation zone leads to the formation of bulge.The reasonable heating method is that the deforming region is heated to the optimum temperature range of 600-700 ℃,the deformed region is heated continuously and a certain length of undeformed region is preheated.With the thickness-to-diameter ratio(t/D) of spun workpiece reducing to certain value(t/D<1%),surface bulge and corrugation is rather easier to come into being,which could be controlled through restraining diameter growth and employing smaller reduction rate and lower temperature in the optimum spinning temperature range. 展开更多
关键词 TA15 titanium alloy hot spinning cylindrical workpiece forming defect thickness-to-diameter ratio
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Dynamics and Control of Grinding Machine with Micropositioning Workpiece Table 被引量:1
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作者 田延岭 张大卫) 闫兵 《Transactions of Tianjin University》 EI CAS 2006年第3期157-162,共6页
To improve the machining precision of a surface grinding machine, a micropositioning workpiece table with high performance was used as auxiliary infeed mechanism to implement nanometer level positioning and dynamic co... To improve the machining precision of a surface grinding machine, a micropositioning workpiece table with high performance was used as auxiliary infeed mechanism to implement nanometer level positioning and dynamic compensation. To better understand the characteristics of the grinding machine modulated with micropositioning workpiece table, the dynamic model of the grinding system was established with modal synthesis and Lagrange's equation methods. The grinding system was divided into five subsystems. For each subsystem, the generalized kinematic and potential energies were obtained. Accordingly the dynamic model of the grinding system was given in the modal domain. The waviness of the grinding process was achieved based on the wheel and workpiece vibration. A nonlinear proportional integral derivative (PID) controller with differential trackers was developed to realize dynamic control. The simulation results show that the machining accuracy of the workpiece can be effectively improved by utilizing the micropositioning workpiece table to implement dynamic compensation. An experimental test was carried out to verify the proposed method, and the waviness of the workpiece can be reduced from 0.46 μm to 0.10 μm. 展开更多
关键词 micropositioning workpiece table surface grinding dynamic modeling nonlinear PID controller
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UG之WORKPIECE功能在模具型腔编程中的使用技巧 被引量:4
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作者 韦林 《金属加工(冷加工)》 2015年第9期42-43,共2页
用UG软件对注塑模具的型腔加工进行编程时常遇到两个问题,一是提供的坯料是实心料,二是提供的坯料常为由线切割切去一部分的空心料。对于两种不同的坯料,在编程时,如利用UG软件的WORKPIECE功能进行相应的设置,会得到与坯料类型相适应的... 用UG软件对注塑模具的型腔加工进行编程时常遇到两个问题,一是提供的坯料是实心料,二是提供的坯料常为由线切割切去一部分的空心料。对于两种不同的坯料,在编程时,如利用UG软件的WORKPIECE功能进行相应的设置,会得到与坯料类型相适应的加工效率。 展开更多
关键词 模具型腔 UG workpiece 型腔加工 注塑模具 空心坯 刀具轨迹 实体图 数控加工编程 刀轨
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Uncalibrated Workpiece Positioning Method for Peg-in-hole Assembly Using an Industrial Robot 被引量:1
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作者 Ming CONG Fukang ZHU +1 位作者 Dong LIU Yu DU 《Instrumentation》 2019年第4期26-36,共11页
This paper proposes an uncalibrated workpiece positioning method for peg-in-hole assembly of a device using an industrial robot.Depth images are used to identify and locate the workpieces when a peg-in-hole assembly t... This paper proposes an uncalibrated workpiece positioning method for peg-in-hole assembly of a device using an industrial robot.Depth images are used to identify and locate the workpieces when a peg-in-hole assembly task is carried out by an industrial robot in a flexible production system.First,the depth image is thresholded according to the depth data of the workpiece surface so as to filter out the background interference.Second,a series of image processing and the feature recognition algorithms are executed to extract the outer contour features and locate the center point position.This image information,fed by the vision system,will drive the robot to achieve the positioning,approximately.Finally,the Hough circle detection algorithm is used to extract the features and the relevant parameters of the circular hole where the assembly would be done,on the color image,for accurate positioning.The experimental result shows that the positioning accuracy of this method is between 0.6-1.2 mm,in the used experimental system.The entire positioning process need not require complicated calibration,and the method is highly flexible.It is suitable for the automatic assembly tasks with multi-specification or in small batches,in a flexible production system. 展开更多
关键词 Uncalibrated workpiece Positioning Industrial Robot Visual Positioning Peg-in-hole Assembly
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THE PROBLEM OF PARAMETRIC INTEGRATION TO THE SLIP LINE FIELD IN THE COMPRESSION OF THICK WORKPIECE
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作者 赵德文 张卫军 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1993年第10期963-969,共7页
An integration depending on a parameter to the compression of a thick workpiece has been obtained. For the conventional prevailing numerical formulaa definite functional relationship bet-ween and y is found. Therefore... An integration depending on a parameter to the compression of a thick workpiece has been obtained. For the conventional prevailing numerical formulaa definite functional relationship bet-ween and y is found. Therefore a parametric integration can be used to get an analytical solution. Take the slip line field for l/h= 0.121 as an example, the analytical solution is basically the same as the prevailing numerical one. It is justified theoretically that for the slip line field a parametric integration is perfectly possible for a satisfactory analytical solution. 展开更多
关键词 thick workpiece slip line field parametric integration analytical solution
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Visual detection method of chamfer Ron the root bottom of textile workpiece roller
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作者 HU Ling-hao LIU Chang jie +2 位作者 SHI Chun rain FU Lu hua LU Gang 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2018年第3期205-213,共9页
Roller is an important workpiece of automatic spinning machine. Only if the chamferR on the root bottom of roller's guide pillar meets processing accuracy requirement can the end face of one roller's guide pillar ma... Roller is an important workpiece of automatic spinning machine. Only if the chamferR on the root bottom of roller's guide pillar meets processing accuracy requirement can the end face of one roller's guide pillar match the correct position of another roller's end face on the guide hole. Therefore, the size of chamfer R on the root bottomof the roller's guide pillar has an important influence on the operating state of automatic spinning machine. In order to achieve the rapid, automatic and precise measurement of chamfer R on the root bottom of roller, an auto detection system }'or roller~ s chamfer based on computer vision technology is proposed. Firstly, the principle of measurement based on computer vision technology is introduced. And then the extraction method of charnfer^s characteristic parameters is presented, which uses image processing technique to obtain these characteristic parameters by means of collected images of roller contour, including extraction of region of interest, extraction of subpixel precise edge, segmentation of arc and line, fittingof geometric primitives, etc. Finally, after experimental verification, the measurement error is within + 5 μm and repeated accuracy is 0.1 pm. The results show that this measurement method is applicable to not only the chamfer on the textile workpiece, but also the workpieces of shaft type with various of sizes. 展开更多
关键词 textile workpiece ROLLER CHAMFER image measurement auto detection
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Modifying the Traditional Analyzing Method of Cylindrical Workpieces’ Deep Drawing Process by Using a Novel Loop Material Theory Method
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作者 Rongxin Yang Zhengwu Lin 《Engineering(科研)》 2017年第4期351-360,共10页
In this paper, the traditional empirical coefficient method and a novel loop material analytical method presented by the authors have been compared and discussed by analyzing several practical cylindrical workpieces’... In this paper, the traditional empirical coefficient method and a novel loop material analytical method presented by the authors have been compared and discussed by analyzing several practical cylindrical workpieces’ deep drawing projects. Also, some conclusions about how to modify the traditional analyzing method of cylindrical workpieces’ deep drawing process could be concluded and the necessity of this modification could be proved. 展开更多
关键词 CYLINDRICAL workpieces Deep Drawing PROCESS LOOP Materials LOOP MATERIAL Plastic Yield Genes Analytical Model
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A MODEL FOR SIMULATION OF FRICTION PHENOMENON BETWEEN DIES AND WORKPIECE
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作者 罗子健 唐才荣 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1984年第3期1297-1307,共11页
Based on the interaction of asperities and upperbound approach a mathematical model for simulation of friction phenomenon between dies and workpiece is proposed. Optimizing the mathematical model with respect to sever... Based on the interaction of asperities and upperbound approach a mathematical model for simulation of friction phenomenon between dies and workpiece is proposed. Optimizing the mathematical model with respect to several variables it is found that in addition to adhering, tearing, ploughing, etc., asperities workpiece can move wave-like along the surface layer and under certain circumstances they may disappear. If the asperities wavily move along the surface layer the friction coefficient depends on the geometry of asperities. However, the bonding strength of asperities, has no significant influence on friction coefficient. The depth of the plastic deformation layer is related to the geometry of asperities, too. The soundness of the prerequisite of the proposed model and some analytical results were verified by experiments. 展开更多
关键词 A MODEL FOR SIMULATION OF FRICTION PHENOMENON BETWEEN DIES AND workpiece
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A Predictive Modeling Based on Regression and Artificial Neural Network Analysis of Laser Transformation Hardening for Cylindrical Steel Workpieces
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作者 Ahmed Ghazi Jerniti Abderazzak El Ouafi Noureddine Barka 《Journal of Surface Engineered Materials and Advanced Technology》 2016年第4期149-163,共15页
Laser surface hardening is a very promising hardening process for ferrous alloys where transformations occur during cooling after laser heating in the solid state. The characteristics of the hardened surface depend on... Laser surface hardening is a very promising hardening process for ferrous alloys where transformations occur during cooling after laser heating in the solid state. The characteristics of the hardened surface depend on the physicochemical properties of the material as well as the heating system parameters. To exploit the benefits presented by the laser hardening process, it is necessary to develop an integrated strategy to control the process parameters in order to produce desired hardened surface attributes without being forced to use the traditional and fastidious trial and error procedures. This study presents a comprehensive modelling approach for predicting the hardened surface physical and geometrical attributes. The laser surface transformation hardening of cylindrical AISI 4340 steel workpieces is modeled using the conventional regression equation method as well as artificial neural network method. The process parameters included in the study are laser power, beam scanning speed, and the workpiece rotational speed. The upper and the lower limits for each parameter are chosen considering the start of the transformation hardening and the maximum hardened zone without surface melting. The resulting models are able to predict the depths representing the maximum hardness zone, the hardness drop zone, and the overheated zone without martensite transformation. Because of its ability to model highly nonlinear problems, the ANN based model presents the best modelling results and can predict the hardness profile with good accuracy. 展开更多
关键词 Heat Treatment Laser Surface Hardening Hardness Predictive Modeling Regression Analysis Artificial Neural Network Cylindrical Steel workpieces AISI 4340 Steel Nd:Yag Laser System
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APPLICATION OF CBN WHEEL IN CONSTRAININGWORKPIECE BURNING DURING CREEP FEEDGRINDING OF TITANIUM ALLOY
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作者 Xu Xipeng Huaqiao UniversityXu Hongjun Nanjing University of Aeronautics and Astronautics 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1997年第2期119-124,共3页
The burning mechanism during creep feed grinding of titanium alloy with SiC wheel is stud- ied. A CBN intermittent creep feed grinding technology combining the advantages of CBN, intermittent grinding and creep feed ... The burning mechanism during creep feed grinding of titanium alloy with SiC wheel is stud- ied. A CBN intermittent creep feed grinding technology combining the advantages of CBN, intermittent grinding and creep feed grinding is recommended. The results show that the intermittent CBN wheel has a bright future in resolving the problem of workpiece burning during creep feed grinding of titanium al- loys 展开更多
关键词 Titanium alloy CBN wheel workpiece burning Creep feed grinding
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