共查询到18条相似文献,搜索用时 109 毫秒
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对自由曲面的数控加工,寻求最优的刀具轨迹生成方法至关重要。本文基于开源3D库Open CASCADE(OCC)和编程开发环境Microsoft Visual Studio 2010(VS2010),应用B样条表达的自由曲面,采用“投影法”思想,研究“重用已有相似刀具路径”方法,提出了处理自由曲面的NC刀具轨迹映射算法。为了验证算法的有效性和可行性,实验建立5类自由曲面,启动设计的轨迹映射算法,输出曲面的NC加工轨迹质量可以满足设计要求,实现了刀具轨迹的重用。 相似文献
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《机械设计与研究》2017,(2)
自由曲面主要是通过数控加工实现,数控加工刀具轨迹规划对自由曲面加工的效率和质量有重要的影响。基于区域的刀具轨迹生成策略是通过识别自由曲面上有意义的特征,将具有相似的加工属性的局部曲面分割成相应的区域,这个过程称为区域分割,再以区域为单位自动生成数控加工刀具轨迹。该加工策略的关键技术是区域分割,针对面向数控加工的自由曲面区域分割技术的进行归纳综述,主要分三个部分:面向数控加工的自由曲面区域的概念和分类、区域分割算法、区域分割技术在自由曲面数控加工中的应用。对以上每个方面中涉及的概念和方法进行简短介绍,就学者们所提出的方法的主要优点和缺点进行讨论。在文章的最后,提出了目前该研究领域仍存在的问题,并对发展方向进行了展望。 相似文献
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复杂曲面的自动抛光加工方法与效率一直是困扰模具曲面加工的难题,将磁力抛光与数字化测量、控制技术相结合,可以较好地解决曲面抛光加工的效率与自动化问题。参考数控加工理论,对自由曲面加工的刀具轨迹以及轨迹生成算法进行了分析,重点探讨了抛光刀具的驻留时间控制算法。 相似文献
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提出一种自由曲面数控加工轨迹曲线计算方法。根据这一方法,可由自由曲面上一定数量的任意分布型值点来 计算曲面加工时的刀具曲线。算法的基本思想是,型值点影响并决定着其控制区域内的曲面形状,这种影响的大小与到 型值点的距离及权指数相关。分别给出了沿X向进给及Y向进给时刀具轨迹曲线的生成算法。讨论了算法中参数选取 对加工曲面形状及拟合精度的影响。 相似文献
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随着我国加工制造业的快速发展,自由曲面加工产品的需求量逐年上升,这必然对其数控加工技术的要求越来越高。本文基于上述背景,以重用已有相似刀具轨迹为基本方法来进行其刀具轨迹模拟,以OCC以及VS2010为编程开发环境,初步设计了其刀具轨迹生成系统,并且最后进行了自由曲面数控加工的仿真设计工作,以期通过仿真实验的方式来进一步分析其刀具轨迹重用的合理性与科学性。 相似文献
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在自由曲面的NC加工中,除了刀具轨迹要合理规划外,还有一个更重要的步骤是刀具轨迹的精度控制。本文介绍了自由曲面三轴联动NC加工时用切线法控制步长,用等残工法控制行距以确保曲面加工精度的方法。 相似文献
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复杂自由曲面曲率分布特征对数控铣削性能的影响 总被引:1,自引:1,他引:1
针对复杂自由曲面的数控铣削性能难预测的问题,提出曲面曲率分布特征值,用于评价数控加工效率和加工精度。在构建的刀位面上策划等间距行走的刀位轨迹,建立刀位轨迹长度和刀具间的最大残余高度作为加工效率和加工精度的评价指标,分析曲面曲率分布特征值对加工效率和加工精度的影响。试验结果证明该自由曲面数控加工模式的有效性。分析发现,随着曲面曲率分布特征值增大,刀位轨迹长度和最大残余高度同时增加,导致加工效率和加工精度同时下降。此外,在曲面曲率分布特征值小于0.5 mm–1时,加工效率降低幅度不超过7 %,但加工精度却下降6~7倍。因此,曲面曲率分布特征值可用于评价和预测复杂自由曲面的数控铣削性能。 相似文献
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自由曲面数控加工路径规划的研究 总被引:3,自引:0,他引:3
论述了自由曲面数控加工路径规划对加工效率的影响,讨论了目前刀具轨迹算法的优缺点。针对自由曲面走刀方向数控加工的研究,建立了简化的刀具轨迹时间模型,并对路径规划的系统进行了讨论。 相似文献
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S. Ding M.A. Mannan A.N. Poo D.C.H. Yang Z. Han 《The International Journal of Advanced Manufacturing Technology》2005,26(7-8):852-860
Machining of steep regions is an important research topic in the machining of free-form surfaces. A new tool path generation
algorithm to adaptively machine free-form surfaces has been recently developed. However, similarly to many newly emerged methods,
so far it has not been used in industry because no commercial platform is currently available and the user-developed system
is not robust enough for industrial applications. To solve this problem, this paper presents a new implementation method by
integrating it in a commercial CAD/CAM system (Pro/Engineer). With this strategy, other than conducts detailed computations
for parameters, such as scallop heights and forward steps, or designing the non-cutting functions such as engaging and retracting
methods, which are routines in every tool path generation process, the implementation utilizes existing tool path generation
templates in Pro/E to generate the required tool paths. This makes the tool path generation process easier and the tool paths
generated more practicable because the integration is relieved of the time-consuming routine calculation and the entire cutting
and non-cutting functions in the commercial system are transparent to users. Based on the API of Pro/E, the new tool path
generation method was successfully implemented and cutting tests were conducted. Not losing generality, the implementation
could also be conducted in other commercial systems as similar templates are available in these systems as well. 相似文献
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Abbas Vafaeesefat 《International Journal of Precision Engineering and Manufacturing》2010,11(2):327-333
An algorithm for three-axis NC tool path generation on sculptured surfaces is introduced when the free-form surface is modeled
parametrically by free-form surface Kriging. The flexibility of dual Kriging that easily defines the intersection of the surfaces
with a set of parallel planes and Cartesian method are combined to generate the tool-paths automatically. The presented algorithm
can simultaneously generate the tool path with a predefined machining accuracy and remove gougings along the tool path. The
algorithms are validated by three experiments in rough and finish machining and the results prove its reliability. Since Kriging
is based on the interpolation of data points, the proposed algorithm can be used for reverse engineering applications. The
system was executed on a standard micro-computer and the software was structured to offer a library of machining functions
for endusers. 相似文献