锻压技术

CWFP12500 kN冷锻压力机有限元模态分析

英文标题：FEM modal analysis on cold forging press CWFP12500 kN

作者：葛敏李海涛李江国

单位：北京机电研究所

关键词：冷锻压力机模态分析动态特性

分类号：

出版年,卷(期):页码：2015,40(10):88-91

摘要：

为了使压力机获得良好的动态特性，以北京机电研究所自主研发设计的CWFP12500 kN冷锻压力机为研究对象，针对其四柱组合式框架结构的特点，采用Solidworks软件建立了整机三维模型，并对机身施加了预紧力，计算出理论的拉杆变形量。运用ANSYS软件先对压力机进行了静力分析，得到了预紧力下的拉杆变形量，然后进行了模态分析，得到了前二十阶模态频率与模态振型。结果表明，ANSYS分析得到的拉杆变形量为3.43 mm，与理论计算值3.77 mm相近，说明了预紧力施加方法的可行性。压力机最小固有频率为17.919 Hz，远大于滑块的激振频率0.42~0.83 Hz与小齿轮轴的激振频率3.3~6.7 Hz，故不会发生共振。分析了各阶振型对压力机产生的影响，并针对变形量较大的拉杆，提出了适当增加其横截面面积的改善措施。

To obtain good dynamic characteristics of the cold forging press CWFP12500 kN, which was designed by Beijing Research Institute of Mechanical & Electrical Technology, a 3D model of the press was established by software Solidworks based on the characteristics of the four-column combined type frame structure. Then, the amount of deformation on the lever was calculated by exerting preload to frame. Further, the statical analysis of the press was made by software ANSYS, the deformation on the lever under preload was obtained，and the first twenty modal frequencies and mode shapes were obtained by modal analysis. The results show that the ANSYS analysis results of the lever deformation amount is 3.43 mm, which is similar to the calculated value 3.77 mm, so the method of applying preload is feasible. The minimum natural frequency of the press is 17.919 Hz, which is much larger than the excitation frequency of the slider 0.42-0.83 Hz and the small gear shaft vibration frequency 3.3-6.7 Hz, so the resonance does not occur. The influence of the vibration mode of every step on the press was analyzed, and the improved measure of appropriately increasing the cross sectional area for the lever with large deformation was proposed.

基金项目：

国家科技重大专项“高档数控机床与基础制造装备”（2009ZX04004-071）

葛敏（1987-），男，硕士研究生

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