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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%。
Based on the brief introduction of oscillating rolling forming technology and oscillating rolling machine, the finite element model of the T200 vertical cold oscillating rolling machine body is established to solve the problem that the oscillating rolling machine can easily cause the body vibration when the oscillating rolling machine oscillates. Abaqus software was used to modally analyze the model of the fuselage, and the ten natural frequencies and their corresponding modes before the fuselage were extracted, and the vibration parts and their causes of each mode were analyzed in turn. The analysis shows that the main cause of the vibration of the fuselage is the unbalanced stiffness of the upper and lower columns, which reduces the modal frequency of the fuselage and the use of the large area of the fuselage to generate local vibration modes and noise. According to the result of the analysis, the fuselage structure is improved, the rigidity of the lower column is increased, the ribbed plate is added to the large area of the fuselage, or the straightforward method is adopted without affecting the rigidity, which improves the dynamic performance of the fuselage , Reducing the local vibration mode, improve the modal frequency of the fuselage about 16%.