第42卷第5期 Vol. 42No.5
计算机应用
假压技木
FORGING & STAMPING TECHNOLOGY
端面无支撑芯辊模态及其动力响应有限元分析
袁建波12，兰箭23
2017年5月 May 2017
（1．武汉理工大学材料科学与工程学院，湖北武汉430070；2．现代汽车零部件技术湖北省重点实验室，湖北武汉430070：
3.武汉理工大学汽车工程学院，湖北武汉430070）
摘要：利用NXNastran对轧制矩形截面环件所用的端面无支撑芯辑进行了模态分析数值计算，得到了芯辑约束工况下的前6 阶固有频率和模态报型，详细分析了各阶模态振型对芯辑工作状态的影响。简化轧制过程芯辑的受力模型，模拟分析芯辑在
号的频域组成对芯辑报动的影响。研究表明：芯辑的工作转速远低于其1阶临界转速，轧制过程不会引起芯辑的其振；芯辑的前6阶固有频率处于声波范围内，易造成噪声污染；轧制力相同时，不同轧制时间对芯辑的位移与应力响应无影响：轧制力信号的频域组成不会引起芯辑的共振，
关键词：环件轧制；轧环机；芯辑；模态分析；瞬态响应；傅里叶变换；有限元分析 DOI : 10. 13330/j. issn. 1000-3940. 2017. 05. 028
中图分类号：TB115：TG333.91
文献标识码：A
文章编号：1000-3940（2017）05-0152-07
Finite element analysis on modal and dynamic response of unsupported
mandrelonendface Yuan Jianbo'-2, Lan Jian'.3
(1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China; 2. Hubei Key
Laboratory of Advanced Technology of Automotive Components, Wuhan 430070, China; 3. School of Automotive
Engineering, Wuhan University of Technology, Wuhan 430070, China)
Abstract: For rolling rectangle section ring, its modal analysis about the end-face unsupported mandrel was carried out by NX Nastran, and natural frequencies and modal vibration shapes of the first six orders were obtained under the constraint condition of the mandrel. Then, the influence of each mode on the working state of the mandrel was analyzed in detail. Furthermore, the force model of the mandrel was simplified in the ring rolling process, and the changes of the mandrel node displacement and stress with time under three kinds of dif-ferent rolling times were simulated and analyzed. At the same time, rolling force signals from three kinds of time domain were transformed by Fourier transform, and the influence of the frequency domain of the rolling force signals on the mandrel vibration was analyzed. The re-sults show that the working speed of the mandrel is much lower than the first order critical speed, and it can not cause the resonance of the mandrel. The first six-order natural frequencies of the mandrel are in the range of sound wave, which is easy to cause the noise pollution. Under the same rolling force, different rolling periods have few influences on the displacement and stress response of mandrel. The fre-quency domain components of the rolling force signals can not cause the resonance of the mandrel.
Key words : ring rolling; ring rolling mill; mandrel; modal analysis; transient response; Fourier transform; FEA
环件轧制是综合轧制和机械零件制造的一种特种成形技术，轧制过程需借助轧环机，使环件产生
收稿日期：20161210；修订日期：20170109 基金项目：教育部创新团队发展计划项目（IRT13087）
作者简介：袁建波（1991-），男，硕士研究生 E-mail: 923418956@ q9, com
通讯作者：兰箭（1972-），男，博士，教投 E-mail: jlan@ whut. edu. cn
万方数据
连续局部成形的塑性加工工艺，是生产轴承环、齿轮环、法兰环等各类无缝环件的先进制造技术[1-2]。轧环机的核心工作部件由驱动辊和芯辊组成，且驱动辑与芯辑直径尺寸相差悬殊。近年来，随着振动理论和相关学科的快速发展，依靠静强度理论来对机械结构进行设计的理念已逐渐地改变，对机械结构的动态性能和振动分析也显得越来越重要[3-4]
环件轧制过程中，坏料厚度的不均匀性、坏料温度的不均勾性、芯辑不同的结构形式、驱动辊不