关键词: 加工中心, 刀尖点, 动柔度, 子结构柔度耦合分析法, 模拟退火粒子群算法

Abstract: It is the highlight in machine tool chatter study area that the tool tip dynamic compliance must be well derived so that machining center cutting stability can be efficiently assessed by plotting the Stability Lobe Diagram (SLD).Impact testing was a simple and direct approach to acquire the dynamic compliance resulting to low working efficiency,which had to be repeated for different tools.Conventional sub-structure synthesis methodology could be borrowed to predict the tool tip dynamic compliance,however recptances concerning on rotational DOFs were extremely complicated either to calculate numerically or to acquire experimentally during the process.Thus a novel approach was described for quickly and accurately predicting machining center tool tip dynamic compliance while different tools were clamped.Methodology of Receptance Coupling Substructure Analysis (RCSA) was modified to deduce the equation of tool tip dynamic compliance.By combining Simulated Annealing (SA) and Particle Swarm Optimization (PSO),the equivalent dynamic coefficients of tool-holder joint were successfully identified,which was the critical foundation for target of prediction in the following section with another help of modified RCSA.The proposed approach was applied for predicting a given vertical machining center tool tip dynamic compliance.Experimental results and comparisons with prediction were provided to verify both validity and accuracy of proposed approach based on the high agreement.

Key words: machining center, tool point, dynamic compliance, receptance coupling substruture analysis, Simulated annealing and particle swarm optimization algorithm