高精密折弯机的关键技术研究.doc

摘 要 折弯机是广泛使用的板料加工设备,其机身的强度和刚度直接影响工件的加工质量和加工精度。针对折弯机的结构设计,传统的方法通常采用应力校核,或按照材料力学、结构力学理论,采用大量简化基础上的计算方法。由于对研究对象的受力情况分析得不够透彻,不能得到准确的计算结果,更不能根据应力分布情况来确定其结构,从而造成了不必要的浪费,通常只能得到一个可行却并非最优的设计方案。 本文介绍了数控折弯机的发展趋势，折弯机机身结构分析的发展现状及分析设计的一般方法，本文以PBB-110/3100型数控折弯机为研究对象，使用大型通用化有限元分析软件ANSYS对折弯机进行有限元静态特性分析，并根据分析结果进行机身的优化设计。 首先，对折弯机的主要部件进行了结构的静态特性分析，建立各部件的有限元模型，利用 ANSYS 计算出它们的强度，刚度和位移，并依据结构受力特点提出结构修改方案。 通过分析的结果对机身提出优化方案，对优化方案进行有限元分析。并把分析结果与优化前的机身静态特性做比较。对比优化后与优化前机床性能是否提高，是否改善了机床的性能，解决了机床的不足之处。 关键词：折弯机 有限元 优化设计 ABSTRACT The plate bender is a kind of equipment which broadly used to sheet metal forming, its strength and stiffness of body of plate bender greatly influences quality and accuracy of work pieces. The traditional design method usually adopts stress check, or the calculate method based on the material mechanics and structural mechanics. As a result, the analysis of force is not thorough, and the solution is not exact. Furthermore, the structure of the flank could not be determined by the stress distribution, and it caused unnecessary waste. Usually a feasible design program can be gained, but not the best one. The development trend of CNC bender, the present situation and the general design method of the forging machine are introduced in this paper, Taking CNC bender as the object of this study, the static characteristics of CNC bender are analyzed in ANSYS, which is a kind of general finite element analysis software. Frame structure has been optimized based on the analysis results. First, the static characteristic of the main part of CNC bender is analyzed. The finite element model of these part are established, the stress, the strain and the displacement of every part is computed by ANSYS. Plan of redesigning of the structure is proposed based on the analysis. Through analysis of the results of the optimization program fuselage made of optimized solutions for finite element analysis. And static characteristics of the fuselage before the results of the