高精度成形装备的研发是我国发展近净成形技术的关键之一.研发并联驱动多连杆压力机是高精度压力机发展的主要方向,如何确定影响其运动输出精度的关键误差因素，进而经济合理地分配各零部件的精度参数，是目前高精度压力机设计所必须要考虑的.在总结分析已有研究的基础上，提出以滑块运动输出位置误差和角度误差两个指标来表征压力机运动输出精度，并基于环路增量法建立了并联多连杆压力机误差传递模型；通过灵敏度分析，确定了影响该类伺服压力机输出精度的关键误差因素，并提出考虑制造成本和输出可靠度的精度综合方法；对4-RRPaR&PRPaR型伺服压力机进行了案例研究,并采用Monte Carlo法进行了验证.结果表明，所提出方法能够有效识别出影响压力机输出精度的关键误差因素，合理调整这些因素的公差值能够使机构输出可靠度满足设计要求.
The development of high precision molding equipment is the key for near-net shape technology in our country. Research and development of parallel driven mechanical press with multi-link becomes important trends. How to determine the key error sources which influence the precision of servo press, thus to distribute the accuracy of the main parts economically and reasonably, is important for the design of high precision servo press. Based on the available research results, the definition, index and affecting factors of servo press’s precision are discussed. Then the structural characteristics of symmetry multi-linkage mechanism are analyzed, and precision analysis models of kinematics output are developed based on loop incremental theory; through sensitivity analysis, the key error sources are identified; considering the manufacturing cost and the constraints of mechanism reliability, the accuracy of the main parts is distributed. A case study of 4-RRPaR&PRPa R servo press is presented by using Monte Carlo method for demonstration of the proposed approaches. The result shows that the error factors which have relatively important influence on the servo press’s precision can be identified effectively, and the requirement of mechanism reliability can be satisfied by adjusting these factors’ tolerance.
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