基于虚拟样机的高速精密压力机设计技术研究

发布时间：2018-01-15 20:29

本文关键词：基于虚拟样机的高速精密压力机设计技术研究　出处：《南京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：高速压力机是航空、航天、国防军工、机械、电子、冶金等重要工业领域不可缺少的基础制造装备。随着高速压力机的高速化、精密化和自动化发展,振动及其带来的精度问题成为制约高速精密压力机发展的关键问题之一。本文以闭式高速精密压力机为对象,以减小振动、提高下死点精度为目的,进行了高速压力机结构静力学分析、模态分析、间隙多体动力学建模、动平衡设计、下死点精度分析。主要内容包括：(1)首先运用ANSYS Workbench建立高速压力机主传动机构和机身的有限元模型。对高速压力机主传动机构进行静力学分析,分析得出主连杆受力最大但强度满足要求；主连杆的变形较大,对高速压力机精度影响较大,故在后文研究中需考虑主连杆的柔性；对高速压力机机身进行静力学分析,得出机身强度满足要求,床身有轻微变形,需加以改善。在ANSYS Workbench建立模态分析中的高速压力机有限元模型,通过模态分析获得固有频率和固有振型,分析表明发生共振的可能性很小。(2)运用ADAMS建立高速压力机刚体模型,建立动平衡机构惯性力公式,分析并确定减小高速精密压力机不平衡惯性力的方法,再在ADAMS中以主滑块质量为设计变量进行惯性力优化,使不平衡惯性力最小,以获得较好的动平衡效果,从而减小振动。(3)运用接触碰撞法建立运动副间隙模型,采用L-N非线性弹簧阻尼模型确定间隙运动副的法向接触碰撞力和C-H修正库伦摩擦力模型确定间隙运动副的切向摩擦力,再在高速压力机刚体模型中施加法向接触碰撞力和切向摩擦力建立高速精密压力机间隙刚体模型。运用ANSYS软件生成主连杆的MNF文件,导入ADAMS中建立柔性主连杆并替代刚性主连杆,完成高速精密压力机间隙刚柔耦合模型的建立。分析确定下死点精度的主要影响因素,对主要因素进行单因素仿真分析得出其影响规律,再运用田口实验法进行多因素仿真分析得出最优的下死点精度结构参数组合,为实际提高下死点精度提供参考。
[Abstract]:High speed press is an indispensable basic manufacturing equipment in aviation, aerospace, national defense military industry, machinery, electronics, metallurgy and other important industrial fields. With the development of high speed, precision and automation of high speed press. Vibration and its precision problems have become one of the key problems restricting the development of high speed precision press. This paper takes the closed high speed precision press as the object to reduce vibration and improve the precision of the lower dead point. Static analysis, modal analysis, multi-body dynamics modeling and dynamic balance design of high-speed press are carried out. Analysis of the accuracy of the lower dead point. The main contents include: 1). Firstly, the finite element model of main transmission mechanism and fuselage of high-speed press is established by ANSYS Workbench, and the statics analysis of main transmission mechanism of high-speed press is carried out. It is concluded that the force of the main connecting rod is the largest but the strength meets the requirements. The deformation of the main connecting rod is large and the precision of the high speed press is greatly affected, so the flexibility of the main connecting rod should be considered in the later research. The static analysis of the fuselage of the high-speed press shows that the strength of the fuselage meets the requirements and the bed has slight deformation. The finite element model of high-speed press in modal analysis is established in ANSYS Workbench, and the natural frequency and natural mode are obtained by modal analysis. The analysis shows that the possibility of resonance is very small. (2) the rigid body model of high speed press is established by ADAMS, and the inertia force formula of dynamic balancing mechanism is established. The method of reducing the unbalanced inertia force of high speed precision press is analyzed and determined. Then the inertia force is optimized with the main slider mass as the design variable in ADAMS to minimize the unbalanced inertial force. In order to obtain better dynamic balance effect and reduce vibration, the contact collision method is used to establish the clearance model of the motion pair. L-N nonlinear spring damping model is used to determine the normal contact impact force of the clearance pair and C-H modified Coulomb friction model is used to determine the tangential friction force of the clearance pair. Then the rigid body model of high speed precision press is established by applying normal contact collision force and tangential friction force to the rigid body model of high speed press. The MNF file of main connecting rod is generated by ANSYS software. The rigid and flexible coupling model of clearance of high speed precision press is established by introducing flexible main link into ADAMS and replacing rigid main connecting rod. The main influencing factors of dead point precision are analyzed and determined. The main factors are analyzed by single factor simulation and the influence law is obtained, and the optimal structure parameter combination of the lower dead point precision is obtained by using the Taguchi experiment method to carry out the multi-factor simulation analysis. It provides a reference for improving the precision of the lower dead point in practice.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG305

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