300MN模锻水压机关键部件接触力学行为分析

【作者】 梁米；

【导师】 谭建平；

【作者基本信息】 中南大学 ， 机械电子工程， 2010， 硕士

【摘要】 巨型液压机是重型机械制造业的重要设备,其本体根据工艺和级别设计成多种结构。我国300MN模锻水压机主框架是一个多约束系统。本文根据300MN模锻液压机状态监测与故障诊断系统力学机理研究要求,采用现代有限元CAE技术,依托良好的实验平台,展开300MN模锻水压机本体结构的力学行为分析。采用Solid Works软件建立水压机本体三维模型——本次研究基础。选用ANSYS对比分析活动横梁不同模具、载荷的九个工况的力学行为——各组件应力应变大小和分布,变形规律等。通过测量靠模和加压模间距之差分析动梁的变形,验证计算的正确性。最终推导出动梁正载变形量公式和靠模模间距的变化规律。针对立柱应力检测保护系统的数据,在ANSYS中系统地计算机架立柱300MN正载工况和实验工况的应力应变大小和规律。1)轴向对比立柱应力轴向分布规律。对比测点分析值相对整个立柱长度的水平。2)平行对比比较八根立柱力学行为,判断应力较大的立柱。通过同工况检测数据验证分析正确性。300MN模锻水压机是圆立柱导向。动梁水平方向偏移倾斜等非正常空间姿态造成机架结构超常附加损伤。本文以现场检测的各向最大偏移值和倾斜扭转角度为输入,应用ANSYS/LS-DYNA定量地计算其接触力学行为。模型简化保留导向结构和框架约束关系,建模设置接触对和施加偏移、倾斜扭转边界条件,修改接触和控制信息,提交LS-DYNA求解器计算。动梁偏移倾斜均引起较大应力和变形,加剧部件间运动干涉。实验研究利用立柱应力检测保护系统数据验证计算正确性。更多还原

【Abstract】 Large-scale hydraulic press is a major equipment of heavy machinery manufacturing. The bulk of it is designed to a variety of structures according to the forging process. The main frame system of 300MN die forging hydraulic press is multi-constrained. Connected with mechanical mechanism research of giant hydraulic press fault diagnosis and early warning system, used modern advanced finite element analysis CAE technology, based on good experimental platform, mechanical behavior research of 300MN die forging hydraulic press is completed in this paper.Three-dimensional models of 300MN die forging hydraulic press parts are established in Solid Works, as the base of the mechanical mechanism research. The mechanical behavior of the activity beam under nine conditions with different moulds and loads are analyzed contrastively in ANSYS. The level and distribution of stress-strain of the beam parts, and the level and regularity of deformation in loading direction are concluded. Experiments were done to obtain pressurized and non-pressurized die spacing differences measured, which is used to analyze the deformation of activity beam. According to the simulation and experimental results, an empirical formula about deformation of the beam under central load, and the rule of die spacing are given. The mechanical behavior of hydraulic press rack under extreme conditions of 300MN central load, and contrast condition are calculated using ANSYS, against the stress testing and protecting system of column.1) Axial contrast, the axial variation of every column is calculated. The analysis stress of testing point and the length of column are contrasted.2) Parallel comparison, the column with larger stress is determined through the comparison of all eight columns. The accuracy of analysis is verified by test data under the same conditions.300MN die hydraulic press is oriented by round column. Additional damage of rack and oriented structure is caused by non-normal space posture of activities beam. Additional contact mechanical behavior is calculated quantitatively in ANSYS/LS-DYNA, using the offset data and tilt angle measured. The oriented architecture and constraint relationship of framework are maintained in model simplification. FEM is established selecting steel and elastic rubber materials related to components, setting loading, offset and tilt boundary conditions and contact pairs. Information of contact and control is amend in key word and then submitted to calculate in LS-DYNA solver. The result of calculate shows the offset and tilt of activities beam cause large stress and deformation, aggravating the movement interference of parts. The correctness of analysis is verified directly and indirectly by stress testing and protecting system.更多还原