A Hardware/Software Architecture for Tool Path Computation. An Application to Turning Lathe Machining

S. Cuenca, A. Martínez-Álvarez, A. Jimeno-Morenilla, J. L. Sánchez
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引用次数: 4

Abstract

Tool path generation is one of the most complex problems in computer aided manufacturing. Although some efficient strategies have been developed, most of them are only useful for standard machining. The algorithm called virtual digitizing avoids this problem by its own definition but its computing cost is high and makes it difficult for being integrated in standard machining in order to adopt the new ISO standard 14649. Presented in the paper there is a virtual digitizing hardware/software architecture that takes advantage of field programmable gate arrays (FPGAs) to improve the algorithm efficiency and to meet the actual restrictions of the traditional computer numeric control systems at the same time. In order to evaluate the architecture, a prototype was implemented using a commercial reconfigurable platform integrated within a CNC lathe for shoe last machining. The performance of the system for tool path generation was measured for different trajectory and surface precisions using a database of real shoe models. The experiments show a significant speedup for all the cases and maintaining the error of the results below the maximum allowed.
刀具轨迹计算的硬件/软件体系结构。在车床加工中的应用
刀具轨迹生成是计算机辅助制造中最复杂的问题之一。虽然已经开发出一些有效的加工策略,但大多数策略仅适用于标准加工。虚拟数字化算法以其自身的定义避免了这一问题,但其计算成本高,难以集成到标准加工中以采用新的ISO 14649标准。本文提出了一种利用现场可编程门阵列(fpga)提高算法效率的虚拟数字化软硬件体系结构,同时满足了传统计算机数控系统的实际限制。为了评估该体系结构,使用集成在CNC车床中的商业可重构平台实现了原型,用于鞋楦加工。利用真实鞋型数据库,对不同轨迹和表面精度下的刀具轨迹生成系统的性能进行了测试。实验表明,在所有情况下都有显著的加速,并且结果的误差保持在允许的最大误差以下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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