黏性流体环境对铣削颤振控制的可行性分析

Feasibility Study on Milling Chatter Suppression in Viscous Fluid

铣削加工过程中,颤振是影响加工效率的关键因素。针对铣削颤振的控制问题,提出将铣削系统置于黏性液体内进行加工的新工艺方法。首先针对性地设计了一个单自由度工件,建立了该工件的稳定性分析模型。然后通过铣削力试验和模态试验,分析了黏性液体环境对铣削力系数及铣削系统动力学特性的影响,结果表明黏性液体在降低铣削力系数的同时,增加了铣削系统的阻尼。最后通过铣削试验定量对比了黏性流体环境对铣削稳定性的影响试验。结果表明,在黏性液体内进行铣削加工时,铣削颤振得到了有效抑制。

During the machining process, chatter is the key factor to limit productivity. In the present study,experimental investigations are concerned which assess the feasibility by submerging the milling system in viscous fluid to mitigate milling chatter. Higher stability limit is obtained with the proposed approach, which indicates that the milling efficiency can be improved greatly under viscous fluid condition. The stability improvement can be attributed to the variations of the milling system dynamic characteristics and cutting force coefficients. Due to the extra energy loss, the damping of the milling system increases significantly under viscous fluid condition. Additionally, the cutting force coefficients are calibrated and the results indicate that the cutting force coefficients reduce significantly under viscous fluid condition by compared with the dry milling. The explanations are verified by the experiments, which validate the effectiveness of the proposed approach on the suppression of milling chatter.