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| 1 | Wholly smoothing cutter orientations for five-axis NC machining based on cutter contact point mesh显示文摘Cutting forces with respect to different cutter orientations are analyzed for five-axis NC machining of a ball-end cutter.A measure is then defined to quantify the effects of cutter orientation variation.According to the measure,a novel model and algorithm are proposed to wholly optimize cutter orientations based on a cutter contact(CC) point mesh.The method has two advantages.One is that the cutter orientation smoothnesses along the feed direction and pick-feed direction are both wholly optimized.The other is that only the accessibility cones of mesh points are required to compute and the computation efficiency is improved.These advantages are shown by simulating the machining efficiency,the stability of feed velocities and the smoothness of cutting force.A computational example and a cutting experiment are finally given to illustrate the validity of the proposed method. | BI QingZhen,WANG YuHan,ZHU LiMin & DING Han State Key Laboratory of Mechanical System and Vibration,School of Mechanical Engineering,Shanghai Jiaotong University,Shanghai 200240,China | 2010 | Science China(Technological Sciences)2010，53，5： | 12 |
| 2 | Tool path generation and simulation of dynamic cutting process for five-axis NC machining显示文摘Five-axis NC machining provides a valid and efficient way to manufacture the mechanical parts with complex shapes,which are widely used in aerospace,energy and national defense industries. Its technology innovations have attracted much attention in recent years. In this paper,the state-of-the-art techniques for five-axis machining process planning are summarized and the challenging problems are analyzed from the perspectives of tool path generation,integrated geometric/mechanistic simulation and machining stability analysis. The recent progresses in accessibility-based tool orientation optimization,cutter location (CL) planning for line contact and three-order point contact machining,shape control of cutter envelope surface and milling stability prediction are introduced in detail. Finally,the emerging trends and future challenges are briefly discussed. | DING Han BI QingZhen ZHU LiMin XIONG YouLun | 2010 | Chinese Science Bulletin2010，55，30： | 11 |
| 3 | Method of accurate grinding for single enveloping TI worm显示文摘TI worm drive consists of involute helical gear and its enveloping Hourglass worm. Accurate grinding for TI worm is the key manufacture technology for TI worm gearing being popularized and applied.According to the theory of gear mesh, the equations of tooth surface of worm drive are gained, and the equation of the axial section profile of grinding wheel that can accurately grind TI worm is extracted. Simultaneously, the relation of position and motion between TI worm and grinding wheel are expounded. The method for precisely grinding single enveloping TI worm is obtained. | SUN Yuehai ZHENG Huijiang BI Qingzhen WANG Shuren | 2005 | Science China(Technological Sciences)2005，48，4： | 5 |
| 4 | A general, fast and robust B-spline fitting scheme for micro-line tool path under chord error constraint显示文摘The discontinuity of linear tool path(or G01 blocks) brings about unnecessary feedrate deceleration and fluctuation during machining. To improve the continuity, the linear tool path is usually smoothed by the local transition method or the global fitting method. For micro-line tool path, the transition method will significantly decrease the machining efficiency and introduce feedrate fluctuation. The global fitting method cannot be directly used in the NC interpolation because the indispensable chord error checking and iterative fitting processes are computation-intensive. This paper presents a general, fast and robust B-spline fitting scheme under chord error constraint for high speed interpolation of micro-line tool path. The proposed fitting method guarantees the chord error by utilizing the strong convex hull property of B-spline curves. The knot vector and control points are initially generated by a progressive iterative approximation method and locally refined to conform to the chord error constraint by using an analytical method. The analytical approximation and refining methods avoid solving a linear system of equations that is necessary in the standard B-spline fitting method. The feasibility and efficiency of the proposed scheme has been verified via simulations and experiments. Compared with the traditional fitting method, the proposed scheme can strictly constrain the chord error and can significantly decrease the computational load. Compared with the transition scheme, the proposed scheme can significantly increase the machining efficiency for the same micro-line tool path under the same chord error tolerance. | BI QingZhen HUANG Jie LU YaoAn ZHU LiMin DING Han | 2019 | Science China(Technological Sciences)2019，62，2： | 4 |
| 5 | An Analytical Curvature-continuous B6zier Transition Algorithm for a Linear Tool Path显示文摘 | Bi Qingzhen Jin Yongqiao Wang Yuhan | 2012 | International Journal of Machine Tools Manufacture2012，57，： | 1 |
| 6 | 5-Axis adaptive flank milling of flexible thin-walled parts based on the on- machine measurement显示文摘 | Huang Nuodi Bi Qingzhen Wang Yuhan | 2014 | International Journal of Machine Tools and Manufacture2014，84，9： | 1 |
| 7 | An algorithm to generate compact dual NURBS tool path with equal distance for 5-axis NC machining 显示文摘 | BI Qingzhen WANG Yuhan ZHU Limin | 2010 | Intelligent Robotics and Applica- tions2010，6425，： | 1 |
| 8 | An algorithm to generate compact dual NURBS tool path with equal distance for 5-axis NC machining 显示文摘 | BI Qingzhen WANG Yuhan ZHU Limin | 2010 | Intelligent Robotics and Applications2010，6425，55： | 1 |
| 9 | An algorithm to generate compact dual NURBS tool path with equal distance for 5-Axis NC machining显示文摘 | BI Qingzhen WANG Yuhan ZHU Limin | | 0，，： | 1 |
| 10 | Dynamic synchronous motion accuracy measurement and estimation for a five-axis mirror milling system显示文摘A mirror milling system(MMS)comprises two face-to-face five-axis machine tools,one for the cutting spindle and the other for the support tool.Since it is essential to maintain the cutter and support coaxial during the cutting process,synchronous motion accuracy is the key index of the MMS.This paper proposed a novel method for measuring and estimating the synchronous motion accuracy of the dual five-axis machine tools.The method simultaneously detects errors in the tool center point(TCP)and tool axis direction(TAD)during synchronous motion.To implement the suggested method,a measurement device,with five high-precision displacement sensors was developed.A kinematic model was then developed to estimate the synchronous motion accuracy from the displacement sensor output.The screw theory was used to obtain the analytical expression of the inverse kinematic model,and the synchronous motion error was compensated and adjusted based on the inverse kinematic model of the dual five-axis machine tools.TCP and TAD quasi-static errors,such as geometric and backlash errors,were first compensated.By adjusting the servo parameters,the dynamic TCP and TAD errors,such as gain mismatch and reversal spike,were also reduced.The proposed method and device were tested in a large MMS,and the measured quasi-static and dynamic errors were all reduced when the compensation and adjustment method was used.Monte Carlo simulations were also used to estimate the uncertainty of the proposed scheme. | XU Kun TANG XinYu BI QingZhen YU YangBo QIAN DeHou JI YuLei | 2023 | Science China(Technological Sciences)2023，66，3： | 0 |
| 11 | Improved closed-loop tracking interferometer measurement for a five-axis machine tool with a bi-rotary milling head显示文摘Tracking interferometer based on bi-rotary milling head is a novel scheme to conduct volumetric accuracy measurement of a five-axis machine tool.The laser beam direction of the interferometer can be regulated to follow the retroreflector by moving the bi-rotary head.This is a low-cost implementation of multilateration measurement,and its measurement accuracy is mainly affected by the error motion of the rotary axes.This paper proposes an improved multilateration principle to identify the positionindependent geometric errors of rotary axis and laser beam,and minimize their impact on the measurement uncertainty.A closed-loop tracking interferometer system installed on the spindle is developed to perform the measurement with high tracking accuracy.The device can be installed on an ordinary five-axis machine tool without modifying the machine tool structure.The proposed scheme is conducive to improving the accuracy and practical application of the tracking interferometer based on birotary milling head.Experiments with the corresponding closed-loop tracking interferometer and uncertainty analysis are conducted to verify the performance of the proposed measurement scheme. | TANG XinYu XU Kun BI QingZhen SONG ZhiYong JI YuLei QIAN DeHou | 2022 | Science China(Technological Sciences)2022，65，5： | 0 |
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