针对快锻液压机自由锻打这一复杂工况——瞬态的打击过程,材料、几何和接触的非线性以及大变形,利用HyperMesh建立以机架、固定横梁、上下模具和锻件为主体的多体动力学模型,调用HyperMesh中内嵌的LS-DYNA模板,加载多体系的非线性材料、载荷和边界条件等,输出K文件并提交LS-DYNA求解。通过后处理得到关键零部件在不同工作条件下的应力、位移云图和能够再现锻打过程中应力波和变形传递的动画。通过分析上述结果,找到了机架和横梁上应力、应变的敏感部位和最大值,为液压机的锻打实验、疲劳分析和优化设计提供了依据。 Aiming at the complex working condition of fast forging hydraulic press, such as the transient striking process, the nonlinearity of material, geometry and contact as well as the large deformation, it is mainly built by HyperMesh that mainly consists of the frame, the fixed beam, the upper and the lower die and the forging In the body dynamics model, the LS-DYNA template embedded in HyperMesh is called, nonlinear materials, loads and boundary conditions of multi-system are loaded, and the K file is output and submitted to LS-DYNA for solving. Through the post-processing of the key components under different working conditions of stress, displacement and can reproduce the image of the deformation process of stress wave propagation deformation animation. By analyzing the above results, the sensitive parts and maximum values ​​of stress and strain on the frame and beam were found, which provided the basis for hydraulic machine forging test, fatigue analysis and optimization design.