2000KN热成形伺服压力机结构设计论文.pdf

华中科技大学硕士学位论文I摘要近年来,随着机械、汽车、航空航天等制造工业的发展,冲压成形产品的结构越来越复杂,各种高性能材料的问世,都对冲压加工设备性能提出更高的要求。传统的机械压力机由于滑块工作模式固定单一,不能满足复杂工件的特殊工艺及特殊材料的成形要求。伺服压力机作为新兴的压力机加工装备,采用伺服电机直接驱动,配合高精度的数字控制系统,具有加工工艺曲线柔性可变,高精度,高效率,节能环保,适应性强等特点,兼备了传统的机械压力机和液压机的双重优点。本文所设计的2000KN机械连杆式伺服压力机用于高强度钢板的热冲压成形,主要在以下几方面开展研究:分析国内外现有的伺服压力机传动形式及其工艺特性,结合热成形工艺技术要求,选定螺杆+肘杆组合作为基本传动形式。为满足热成形的特殊工艺要求,对肘杆传动机构进行改进和优化,运用ADAMS软件对提出的三种改进方案的进行对比分析,优选下三角肘杆结构。在ADAMS优化模块中对下三角肘杆机构进行结构尺寸优化,在满足性能要求的前提下,增加机构运行稳定性,降低电机峰值功率需求。基于UG软件,完成压力机各零部件计算设计及三维建模。具体设计下三角肘杆系统,选择滚珠丝杠等关键部件并建模;设计完成与传动系统匹配的高刚性、高强度机身,进一步完成滑块,导轨等主体部件的设计建模。对整机零件进行虚拟装配,进行零部件干涉检查,保证后续运动学分析及静力学计算具有准确的数据模型。运用ABAQUS软件对机身静力学有限元计算及模态分析,得到工作载荷下机身应力应变水平及各阶模态振型,根据分析结果修改优化机身结构,以满足刚度和强度要求。基于ADAMS软件建立整机虚拟样机,导入通过模拟实验得到的液压平衡缸和高强度钢板的冲压反作用力曲线,在额定电机转速驱动下进行运动学和动力学仿真,得到工作过程所需的电机扭矩曲线;分析滑块速度、加速度,并与热成形工艺要求对比,性能满足设计要求。关键词:伺服压力机;传动机构设计;结构设计;有限元分析;虚拟样机华中科技大学硕士学位论文IIAbstract With the development of manufacturing industry in recent years, such as mechanics, automobile, aeronautics, astronautics etc,the punch forming products structure e more and plicated. As all kinds of high-performance ing out, which bring more requirements to equipment performance for stamping. Because of fixed and single working mode of slides, traditional mechanical press hasn’t met plex workpiece’s special technology and materials’ requirement for forming. As an emerging press machining equipment, servo mechanical press has servo motor drive directly, which is in harmony with high–precision digital control systems, being characterized by flexible processing technology, high–precision, high efficiency, energy-saving, environmental protection, and has the double advantage of traditional mechanical press and hydraulic and oil press. The design of 2000KN servo mechanical press in this paper, with type “mechanical-linkage”, is used to high strength weldable hot -punch forming, the main results and conclusions of this thesis are listed as follows: Analyzed the transmissions type and processing property of existing servo mechanical press,