立式冷摆动辗压机机身模态分析

Model analysis of frame for vertical orbital cold forging press

在简要介绍摆动辗压成形技术和摆动辗压机基础上,针对摆动辗压机实现摆动运动时易引起机身振动的问题,建立了T200立式冷摆动辗压机机身有限元模型。运用Abaqus软件对机身模型进行模态分析计算,提取该机身前十阶固有频率及对应振型,依次分析各阶振型易产生振动的部位及原因。分析结果表明,引起机身振动的主要原因是由于上下立柱刚度不平衡降低了机身模态频率以及使用机身大面积板材会产生局部振型和噪声。根据分析结果对机身结构进行了改进设计,加大了下立柱刚度,对机身的大面积板材部位采取加肋板或在不影响刚度前提下直接去除的改进策略,提升了机身动态性能,减少了局部振型,改进后机身模态频率提高约16%。

The rotary forging technology and orbital forging press were briefly introduced, and aiming at the problem of frame vibration caused when swinging motion is achieved for rotary forging machine, the finite model of frame for T200 rotary forging machine was founded. The frame mode was modal analyzed and calculated by Abaqus, and the first ten inherent frequencies and corresponding vibrations were extracted, then parts be easily to vibration and the reasons for each modes were analyzed in turn. The results show that the main problems for frame vibration are the reduction of frame model frequency for stiffness unbalance of up and down columns and local vibration and noise produced by using large area panels. According to the analysis results, the frame structure was improved, including increasing the stiffness of down column and adding ribs or be directly cutted out without affecting the stiffness for the large area panels parts, which enhances the dynamic characteristics of frame, reduces the local vibration. The improved frame modal frequency is increased by 16%.