共查询到17条相似文献,搜索用时 109 毫秒
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复杂参数曲面高精度刀具轨迹规划算法 总被引:7,自引:1,他引:6
在对等残余高度刀具轨迹规划算法加工参数曲面研究的基础上,提出带有误差补偿值的复杂参数曲面高精度刀具轨迹规划算法——高精度刀轨误差补偿算法。通过分析刀触点及与之相应的相邻路径上的粗、精刀位对应点间的关系,引入误差补偿值以提高精对应刀位点的求解精度,得到经过合理简化的误差补偿值表达式,并得出粗、精对应刀位点与理论刀位点的距离误差表达式。高精度刀轨误差补偿算法可以在满足插补运算实时性要求的前提下,使相邻轨迹上与刀触点相对应的刀位点的参数值计算精度得到极大提高,进而提高复杂参数曲面的加工刀具轨迹精度。以使用平底铣刀为例进行仿真加工,结果表明高精度刀轨误差补偿算法适合进行对复杂参数曲面的高精度加工。 相似文献
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应用3D刀补功能进行五轴端铣加工时,如果某一点处的刀具半径补偿矢量出现奇异解,会导致直线轴控制点在该位置附近发生运动突变。为了准确检测出发生运动突变的位置,从而为进一步解决该类型突变问题提供前提条件,以平底刀为研究对象,在建立切触点与直线轴控制点空间映射关系的基础上,分析了3D刀补中加工奇异点产生的原因;针对奇异点、奇异点相邻点以及奇异区域边界三处会发生运动突变的位置,给出了基于计算刀轴法矢量夹角与观察刀轴姿态主导角符号的检测算法。仿真实验证明了该算法的正确性与有效性。 相似文献
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矢量法刀具半径补偿,具有程编简单(刀具半径补偿全由机器自动解决,完全与程编无关),刀具半径补偿时停刀时间短暂以及在对复杂曲线直接插补(如抛物线插补、椭圆插补等)时同样能有效地进行刀具半径补偿等优点。本文详细介绍矢量法刀具半径补偿的补偿原理,尖角过渡时的刀具自动转接,刀具趋近工件时的起始刀具矢量偏差倒正等的原理和实现方法。 相似文献
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Li Han Xiao-Shan Gao Hongbo Li 《The International Journal of Advanced Manufacturing Technology》2013,67(9-12):2563-2575
The numerical control (NC) program for multi-axis end milling depends on the parameters of the tool, in particular, the radius of the tool. When there is any tool dimensional change due to various reasons, the user needs to re-generate the NC program, which is a time-consuming procedure. In this article, a cutter radius compensation method for multi-axis end milling is proposed. It takes a general NC program as the input, recovers the normal vectors of the machined surface from the NC program via surface reconstruction, and uses these vectors as compensation vectors to realize space cutter radius compensation. The proposed algorithm of shape reconstruction and normal vector computation has a linear complexity in terms of the number of cutter center location points in the NC program. Thus, real-time computation and compensation is possible. Our method also provides a way to restore the machined surface if the CAD model of the machines surface is not accessible. This has other applications, such as interference detection and manufacturing simulation. The compensation algorithm is shown to be very effective in reducing the number of undercut points through simulation with the software VERICUT and with real milling for real-world NC programs. 相似文献
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提出了圆锥样条合成矢量插补及其数控加工C机能刀补算法。建立相对坐标系,基于相对坐标系中曲线始点差分值递推计算曲线坐标值,实现圆锥样条统一插补。构建矢量圆,利用矢量圆与圆锥样条的矢量合成构建圆锥曲线等距曲线,进而实现圆锥曲线等距曲线的矢量合成插补,控制刀位点进给。在此基础上,设计圆锥曲线数控加工衔接处尖角过渡的解决方法,实现圆锥样条数控加工C机能刀补。实验证明:算法鲁棒、有效,满足工程应用需要。 相似文献
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介绍了CNC系统中刀具补偿原理,提出了完整的算法,同时对软件实现作了详细说明。本算法能够实现刀具长度补偿CLC,以及4种常见轮廓的刀具半径补偿CRC功能。 相似文献
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徐森亮 《现代制造技术与装备》2012,(4):62-63
针对零件铣削加工时的刀具半径补偿问题,阐述了刀具半径补偿功能与工件精度之间的关系,以及自动编程时刀具半径补偿处理方法,并通过实例介绍了运用UG软件,在零件精铣时生成刀具半径补偿指令的CAM操作。 相似文献
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Zhaoqin Wang Xiaorong Wang 《The International Journal of Advanced Manufacturing Technology》2014,71(9-12):1527-1537
A novel cutter radius compensation method named cutting-point virtual tool radius compensation (CPVTRC) is presented in the finishing of ellipsoidal outer contour. CPVTRC, which corresponds to a virtual tool established at cutting point, is realized through parametric programming which is powerful in solving special manufacturing problems and exhibits great industrial application prospect. The parametric program for ellipsoidal outer contour finishing is given based on the algorithm of CPVTRC. The corresponding amount of the virtual tool radius per layer is calculated via the cutting-point coordinates and the elliptical outer offset curve parametric equation of the current layer. And it is inputted into corresponding registers online using programmable data input command G10L12, and then called through cutter compensation command G41/G42 before interpolation of the ellipse in the current layer. Consequently, the ellipse per layer of ellipsoid is approached via tiny line segments using CPVTRC method. The results of simulation based on VERICUT software and experiment based on a 3-axis vertical computer numerical control (CNC) machine equipped with FANUC 0i-MC exhibit that CPVTRC is highly effective and correct. Furthermore, CPVTRC can extend its application to the CNC parametric programming and machining of swept surfaces. 相似文献
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为在经济型CNC系统中全面实现C功能刀补,提出一种简单有效的刀补建立和撤消方法,并对现行C刀补建立和撤消过程中的刀具中心轨迹加以修正,以解决刀具与工件轮廓之间的干涉问题. 相似文献