CAJ | 학술논문

应用Timoshenko梁理论综合考虑了微细立铣刀特殊结构及其高转速工况引起的剪切效应和惯性效应，建立了微细立铣刀悬伸部分的动力学模型；分析了所建立的模型的收敛性问题，通过试验验证了模型的准确性，并与欧拉梁理论计算结果和有限元软件仿真结果比较，证明了模型的适用性；利用建立的微细立铣刀动力学模型，研究了微细立铣刀刀头直径、刀头部分长径比和刀颈半锥角等刀具结构参数对刀具固有频率的影响。模型可用于微细立铣刀的参数化设计和优化，改善其动力学特性。
응용Timoshenko량이론종합고필료미세립선도특수결구급기고전속공황인기적전절효응화관성효응，건립료미세립선도현신부분적동역학모형；분석료소건립적모형적수렴성문제，통과시험험증료모형적준학성，병여구랍량이론계산결과화유한원연건방진결과비교，증명료모형적괄용성；이용건립적미세립선도동역학모형，연구료미세립선도도두직경、도두부분장경비화도경반추각등도구결구삼수대도구고유빈솔적영향。모형가용우미세립선도적삼수화설계화우화，개선기동역학특성。
A dynamic model for the over-hanged part of a micro-endmill was proposed comprehensively considering shear deformations and rotary inertia effect due to the nature of the micro-endmill with the theory of Timoshenko beam. The convergence behavior of the built model was analysed,and its correctness was verified with tests.The applicability of the model was proved by comparing the test data with the calculated results using the finite element method and the Euler beam theory.Based on the developed model,the effects of its tool tip diameter,tip section aspect ratio and semi-taper angle on the natural frequencies of the micro-endmill were studied.The proposed model provided a better basis for parametric design and optimization of micro-endmills to improve their dynamic performance.