共查询到19条相似文献,搜索用时 343 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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针对高速脉冲均匀分配算法不能根据相邻粗插补数据的变化计算精插补数据的问题,提出了一种四点插值细分精插补算法,并利用FPGA进行硬件仿真。实验表明该算法既可以保证脉冲均匀分配,又可以有效地降低精插补与粗插补数据点的偏差,进一步提高了数控系统控制精度。 相似文献
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插补算法是数控技术的核心。在研究等参数直线插补的基础上,提出一种参数自适应插补算法,并给出该算法的原理和算法流程图。该算法提出了参数中间点的概念,以参数中间点到插补直线的距离作为插补误差,通过控制参数增量的大小,来实时控制插补误差。将此算法应用于椭圆曲线的加工中,通过分析得出该算法能提高插补误差的均匀性,提高加工质量,且对参数变量的选择没有限制,具有较好的应用性、适用性和推广性。 相似文献
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在加工短线段时,可以采用高阶样条曲线进行插补来平滑拐角,使得机床在加工路径的拐角处实现连续不间断进给运动,但无法精确控制拐角轮廓误差.针对该问题,进行基于有限脉冲响应(FIR)滤波的拐角轮廓误差精确插补算法研究.利用FIR滤波器,对速度和加速度滤波进行三次滤波,生成平滑的高阶参考轨迹,通过调节进给脉冲的重叠时间,精确控制拐角轮廓误差.通过与点对点插补算法实验进行对比分析,结果表明基于FIR滤波控制连续拐角轮廓误差的插补算法加工时间相比传统点对点插补算法减少8.4%,加工质量得到了提高. 相似文献
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五轴联动数控加工中的刀具轨迹控制算法 总被引:2,自引:2,他引:0
已有的五轴联动数控加工系统往往忽略刀轴矢量插补问题,只是简单地通过对线性轴进行插补、对旋转轴进行跟随的方式来实现刀具轨迹的控制,导致产生非线性误差和刀具碰撞与干涉等问题。为此,提出一种基于刀轴矢量插补的刀具轨迹控制算法。该算法采用大圆弧插补法对加工过程中的刀轴矢量进行控制,同时采用NURBS曲线拟合方法对控制过程中产生的中间点进行处理,并通过对拟合而成的NURBS曲线进行插补来实时计算各运动轴的位置。该算法不仅能够有效地提高五轴联动数控加工的精度,而且可以有效减小数据存储量。仿真和实际加工验证了算法的有效性和实用性,证明算法具有轨迹过渡平稳、非线性误差小的特点。 相似文献
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加工不等厚度的复杂薄壁球型件,传统加工方法采用直线逐次逼近的插补方法,该方法带来的弓高误差相对较大,无法满足现需的加工精度。故研究了一种新型的基于球坐标的插补算法。该算法采用空间螺旋线规划走刀路线,并进行球面调和(SH,Spherical Harmonics)处理,形成基于球坐标的插补算法。最后在数控系统中采用双向球坐标二次插补。此类新型插补算法经改进后可应用于各类物件表面加工系统,可提高实用性。 相似文献
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在传统的逐点比较插补方法的基础上,介绍了一种新的插补方法———最小误差插补方法,这种插补方法可使插补误差控制在±2/2t 范围内,对于数控加工有着实际的意义,文中给出了相应的简单易实现的算法。 相似文献
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对插齿控制运动进行描述,将编译理论引入插补、成功地实现了对用语言描述的运动轨迹齿的插补。同时对另一种自定义方式--离散点定义作了介绍,研究并实现了一种无粗插补的样条曲线实时插补算法,最后给出一个自定义齿扇的加工实例,结果表明加工精度可稳定在GB100095-88 6.5级。 相似文献
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Yu-an Jin Yong He Jian-zhong Fu Zi-Chen Chen 《The International Journal of Advanced Manufacturing Technology》2013,69(1-4):405-416
A typical open computer numerical control (CNC) system should own the capability of being redeveloped easily and effectively, and any improvements of interpolation algorithm or machining technique could be put into practice by users conveniently. However, this is not always available in the current open CNC systems. To solve this problem, an interpolation method based on external profile mode (EPM) is introduced to improve the universality and the performance of an open CNC system in this paper. The method is realized with a rough interpolation in the PC host and a fine interpolation in the slave motion controller. With this method, various interpolation algorithms can be easily realized in the rough interpolation when machining complex contours. Meanwhile, the machining parameters during each interpolation cycle can be wholly determined by the host, so a real-time adjustment of machining parameters can be accomplished during the interpolation. The working principal of EPM is presented in this paper, and the realization of interpolation algorithms with the proposed method is described. A look-ahead algorithm for determining the machining parameters of each segment is implemented based on the length of segments in the rough interpolation. An acceleration/deceleration strategy with confined jounce is proposed in the look-ahead algorithm. The experimental results of specific profile interpolation show that the interpolation method based on EPM can make the open CNC system more universality and high performance. 相似文献
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在逐步比较法的基础上,提出一种数控直线插补的优化算法,并对该插补算法的原理及其实现过程进行了阐述,并通过插补实例和实践应用证明其优越性。 相似文献
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传统的插补算法都是依赖于曲线的数学函数表达式,对于无法得到具体方程表达式的曲线就难以适用,而如果采用位模式插补算法,就可以有效地解决这个问题。本文首先对位模式插补算法的原理进行了分析,然后在通用的DSP芯片上通过实例对算法进行了验证,最后对存在的主要问题进行了讨论。实验结果表明:位插补算法简单、有效并且对插补数据的形式没有要求,在数控系统已经具备了较实用的直线插补和圆弧插补功能的基础上,位插补可以为比如样条插补、函数曲线插补提供一条途径。 相似文献
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Kenneth Sprott 《The International Journal of Advanced Manufacturing Technology》2016,84(9-12):2319-2329
This paper presents an algorithm for five-axis CNC interpolation. The algorithm generates cutter location points by interpolating the surface normals along a desired path. The surface normals are represented by line coordinates which tie a orientation vector with a specific point in space. The algorithm uses line displacements to generate an approximation of the surface normals along a path. The main advantage of this method is that it relates the angular velocity of the tool to the feed rate requirement of the interpolation. An example is shown of the interpolation technique on a Bezier surface. 相似文献
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Taik-Min Lee Eung-ki Lee Min-yang Yang 《The International Journal of Advanced Manufacturing Technology》2007,31(11-12):1191-1197
With the rapid development of the information/image system and aero-space industries, high quality optic aspheric surface lenses play an increasingly important role for completion of the functionalities. Aspheric lenses are non-spherical surfaces having rotation symmetry about the lens axis. The aspheric lens has various shapes according to its application and often requires tens nanometer order form accuracy since surface roughness and form accuracy play essential roles in the functional performance of the optical products. Interpolation of the aspherical surface path must precisely meet the allowable tolerance. Linear interpolation of the aspheric surface path for CNC machining generates an enormous amount of NC code to satisfy the extremely small tolerance, and produces scallops on the machined surface due to the acceleration and deceleration of the tool during every linear motion. Alternatively, interpolations with bi-arcs are used. In this paper, in order to minimize the error induced by the cutting tool path and to shorten the calculation time of interpolation, a precise -arc interpolation method is proposed. The developed algorithm of bi-arc interpolation meets the given tolerance precisely. This is guaranteed by an analytical proof and error maps. Another advantage is its ability to calculate about five times faster than the existing arc interpolation, since iterative calculations for the maximum error can be omitted. The developed algorithm has been used for the precise aspheric machining. 相似文献