钛合金铣削加工中的过程阻尼效应

摘要

The process damping in milling of Titanium alloy is analyzed and verified experimentally.Titanium alloy used com-monly in aviation industry is one typical difficult-to-machine material.Chatter usually occurs in machining of Titanium alloy be-cause of high unit cutting force,which results in poor surface quality and damaged tool.Thus,chatter is one serious restriction for the quality and efficiency of aeronautical manufacture.The process damping results from ploughing effect,which was caused by interference between flank face and machined surface.The paper calculates the indentation area and resistance caused by interference in the milling of typical Titanium alloy and establish nonlinear model which consider process damping.The computing results indicate that limit cutting depth at low speed can be improved significantly relative to linear model and the ex-perimental results indicates that the model can predict stability limitation at low speed accurately.%对钛合金铣削加工中的过程阻尼效应进行分析及实验验证。钛合金是航空常用的、典型的难加工材料，其单位面积切削力大，在加工中极易产生颤振、恶化表面质量、损坏刀具。钛合金切削加工的颤振问题，是制约航空制造效率和质量的重要问题。过程阻尼效应来源于后刀面与工件表面振动波纹干涉产生的犁耕效应，利用隐式龙格库塔法，计算典型钛合金材料铣削加工中干涉产生的侵入面积以及阻力，建立考虑过程阻尼的非线性模型。计算结果表明：相对于传统的、不考虑过程阻尼的线性动力学模型，非线性模型中的低速区极限切深可显著提高；实验结果表明：该模型能较为准确地预测低速区的稳定性极限，为加工参数选择提供重要参考。