非球面件数控研抛力、研抛工具位置和姿态解耦技术

为解决非球面自动研抛系统中普遍存在的研抛力-研抛工具的位置-研抛工具的姿态(以下简称力-位-姿)相互耦合问题,提出一种基于磁流变力矩伺服装置(MRT)的非球面数控研抛力-位-姿解耦技术。基于Hertz接触理论和摩擦学原理,分析研抛过程中的力-位-姿耦合机理,建立了耦合模型。阐述基于MRT的数控研抛力-位-姿解耦原理,开发相应的实验研究系统,建立系统研抛力模型。规划了研抛工具的路径。试验得到0.025 μm粗糙度的镜面表面。试验表明该技术能独立、主动、实时地控制研抛过程中的研抛力、研抛工具的位置和姿态。

Force-position-posture decoupling technique for NC polishing of aspherical part

A novel force-position-posture decoupling technique was proposed based on a magnetorheological fluid torque-servo(MRT) to solve the coupling problem in the numerical control(NC) automatic polishing system of the asphesical surface. The mechanism of the force-position-posture coupling was investigated based on Hertz contact theory and the tribological principle, and a coupling model was built. The MRT-based force-position-posture decoupling principle was studied, a corresponding polishing experiment system was developed. A polishing foree control model was established, and the path of the polishing tool was planned. Experiments were cassied out and a missos-like aspherical surface with a roughness of R_a≤0.025 μm was obtained. The results proved that using the proposed decoupling techniue, the polishing force, the tool position and posture can be controlled independently, actively and simultaneoushly during the polishing process.