Design of a 3-DOF PKM module for large structural component machining
Design of a 3-DOF PKM module for large structural component machining
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DOI：
10.1016/j.mechmachtheory.2010.01.008
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发表时间：
2010-06
影响因子：
5.2
通讯作者：
Y. Li;Haitao Liu;Xueman Zhao;Tian Huang;D. Chetwynd
中科院分区：
文献类型：
--
作者：
Y. Li;Haitao Liu;Xueman Zhao;Tian Huang;D. Chetwynd
提出了一种新型的三自由度并联机床模块A3头，该模块可用于形成大型结构件加工的五轴加工单元。A3磁头背后的架构是3-RPS并行机制。A3头的半解析刚度模型，制定考虑到与致动和约束相关的组件顺应性。与无量纲处理的刚度模型，一个全球性的性能指标，提出了最小化的一组适当的约束产生的结果，深入的讨论，导致只有一个四个几何参数被确定为实现紧凑，轻便而刚性的设计。在整个工作空间内对优化后的A3股骨头进行刚度评估，并与参考配置下的有限元分析结果进行比较。
This paper presents a novel 3-DOF PKM module named the A3 head that can be employed to form a 5-axis manufacturing cell for large structural component machining. The architecture behind the A3 head is a 3-RPS parallel mechanism. A semi-analytic stiffness model of the A3 head is formulated by taking into account the component compliances associated with actuations and constraints. With the dimensionless treatment of the stiffness model, a global performance index is proposed for minimization subject to a set of appropriate constraints generated as a result of in-depth discussion, leading to only one of four geometric parameters to be determined for achieving a compact, lightweight yet rigid design. Stiffness evaluation of the optimized A3 head is carried out throughout the workspace and comparisons are made with those evaluated by finite element analysis at the reference configuration.