共查询到19条相似文献,搜索用时 78 毫秒
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提出一种新的刀具轨迹优化算法,使相邻加工轨迹间的残留高度值都等于允许残留高度值(规定精度),从而达到最大的切削带宽,消除了干涉。同时采用刀位显示验证方法对加工某叶片模型所得到的刀具轨迹进行验证。实验数据表明,在保证精度的前提下,轨迹数和轨迹长度明显减少,大大提高了多轴联动数控加工的效率。 相似文献
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基于STL模型支撑生成算法的研究 总被引:4,自引:0,他引:4
针对快速成型制造中须对零件加支撑的需求,提出一种新的支撑生成方法。它首先提取零件待支撑区域的关键特征(如悬吊点、下棱线、待支撑下表面的轮廓线等),同时指出各种支撑的基本构件实质就是单边对应的多边形支撑面,并采用了局部斜板支撑的方案实现其生成算法,在此基础上生成零件的特征支撑;然后采用对生成的特征支撑STL模型分层后分区扫描填充加强支撑线来实现对待支撑下表面内部区域的有效支撑。应用表明:该方法实现了对成型零件关键特征的准确支撑和对待支撑面域的有效支撑,生成支撑效果良好。 相似文献
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对自由曲面NC加工中刀具轨迹生成技术和干涉处理方法进行了分析,以同面模型→刀具接触点数据→无干涉刀位数据为基本求解策略,研究开发出适用于带倒角平底刀无干涉刀具轨迹生成的新算法。该算法具有干涉检测彻底、处理效率高、稳定性好等优点。 相似文献
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一种新的数控加工刀具轨迹生成算法的研究 总被引:14,自引:1,他引:13
详细分析了一种新的刀具轨迹生成算法--自适应等参数曲线。通过提出子等参数曲线插入条件,使该算法的实施成为可能。该算法具有等参数线法生成刀具轨迹简单的优点,同时克服了用等参数线法生成刀具轨迹可能产生的刀具轨迹冗余的缺点。 相似文献
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自由曲面三轴联动数控加工刀位轨迹生成的研究 总被引:2,自引:0,他引:2
自由曲面数控加工刀位轨迹的自动生成,是相关CAM技术的关键问题。本文利用点涉法原理推导出刀位点的计算公式,在此基础上,考虑存在干涉的刀具与被加工曲面接触点具有区间连续的特性,以非均匀走刀方式,介绍空间自由曲面三轴联动数控加工刀位轨迹的生成方法。 相似文献
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《机械科学与技术》2017,(10):1562-1569
等高线成形轨迹是现行板料渐进成形的主要加工方式。针对等高线成形方式易产生局部凹陷或破裂等问题,提出了一种基于STereo Lithography(STL)三角面片法向矢量的自适应螺旋线轨迹的生成算法。利用顶点偏置法偏置STL三角面片模型,对偏置后的模型采用自适应分层算法求取分层面与模型的交点,得到与XY平面平行的系列轮廓线,并将各层轮廓线离散成等数点,再对相邻轮廓上点的插值得到自适应螺旋线轨迹。算法实例表明,螺旋线成形轨迹能缩短成形时间,可避免等高线成形中刀位点集中造成的质量缺陷等问题。此外,双成角成形件不同区域表面粗糙度的一致性,说明自适应螺旋线轨迹在变成形角成形件上能避免等高线成形件表面粗糙度的多样性,在统一变成形角成形件表面粗糙上具有广阔的运用前景。 相似文献
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L. Jie M. Jianhua H. Shuhuai 《The International Journal of Advanced Manufacturing Technology》2004,23(9-10):696-699
This paper introduces a new sheet metal dieless forming technology. This technology adopts the principle of “layered manufacture” in rapid prototyping technology; it can form sheet metal parts without dies. A new method of tool-path generation based on STL file for sheet metal dieless forming is proposed. 相似文献
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阐述了基于细分曲面数控加工刀具轨迹的生成方法,主要包括求交点的算法和对交点进行优化处理的算法,该方法具有一定的可行性和实用性。 相似文献
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通过最小化每个刀位网格单元的加工误差以确定每个刀位网格的节点位置,加权平均相关联刀位网格节点来对齐相邻刀位网格单元的边缘,生成高效合理的数控加工刀具路径.对所获得的具路径信息进行后置处理,根据机床的结构不同,采用了相应的坐标转换,生成用于三轴加工和五轴加工的G代码.利用Vericut软件,对数据点云直接加工的刀具路径进行了动态仿真,最后应用实例验证了后置处理生成G代码的有效性. 相似文献
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A new tool path generation method for sheet metal computer numerically controlled incremental forming was proposed based on the stereolithography model, considering the factors of sheet thickness variation, surface smoothness, and extruding direction. The new cutter contact surface modeling algorithm based on the non-equidistant offset was presented, which can be adapted to the sheet thickness variation so as to guarantee a reasonable gap between the forming tool and support. Moreover, a spiral tool path generation algorithm was introduced by considering the scallop height in both z-axis direction and circumferential rotation direction, so that a smoother surface can be obtained. In addition, the algorithm for keeping the tool direction perpendicular to the wall surface was also presented. Finally, the case study shows that the proposed method can automatically generate smooth and continuous spiral tool path with constant scallop height. The developed software system runs steadily and reliably. 相似文献
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面向数控加工,论文讨论了STL模型的刀具路径规划问题.在STL切片的基础上,对切片数据进行三次分段NURBS曲线插值,通过刀触点计算出刀位点,实现了数控加工路径的规划. 相似文献
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Jun Hu Lei Luo Wen Peng Zhenqiang Yao 《The International Journal of Advanced Manufacturing Technology》2008,39(7-8):755-759
In shoe-last high-speed numerical machining, the key step is to generate CNC machining tool path by data sampled from the shoe last rapidly and accurately. By analyzing the characteristics of helical line and the model of the shoe last expressed in cylindrical-polar coordination system, an algorithm for generating spiral tool path of shoe last with varying pitch was presented. By sample data interpolation, mathematic models with different pitch of helical line were built, and the tool paths with different machining parameters were determined. The effectiveness is verified by the emulation and experimental results represented in the paper. 相似文献
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Ning Dai Guang Lei Dong Wen He Liao Yu Chun Sun 《The International Journal of Advanced Manufacturing Technology》2013,66(1-4):555-563
Contour-parallel offset (CPO) tool path is widely used in the rough machining process for dental restoration. In order to minimize the number of tool retractions that do not contribute to the actual cutting as well as to optimize the links between tool path loops (TPLs), a novel CPO tool path-linking algorithm based on graph model is presented. With the directed relationship built during the calculation of TPLs, a directed graph model is constructed and then divided into many subgraphs. As a result, all TPLs are split into several grouped TPL units. TPLs in each unit are linked by linking point pairs. Finally, a CPO tool path without tool retraction can be generated by traveling TPL graph. Several test results show that this method can effectively obtain CPO tool path without tool retraction and overmilling. 相似文献