镦粗挤压防失稳模具结构设计.doc

江苏科技大学 本 科 毕 业 设 计（论文） 学 院 材料科学与工程学院 专 业 材料成型及控制工程 学生姓名 班级学号 指导教师 二零一年六月 The mold design of upsetting and extrusion to prevent instability  摘 要 随着时代的发展，科技的进步，社会生产水平的不断提高，大量的社会需求促使制造业的加工工艺不断发展与优化。在传统镦粗锻造中，锻件的高径比不能大于3，否则锻件会发生失稳而弯曲，这一问题就是困扰企业高效生产的一大难题。 本文就是针对长轴类锻件在镦粗过程中会发生失稳现象这一问题而制定相关方案并设计模具，以此来解决这一难题，从而提高生产效率。本次所设计的模具的关键就是控制长轴锻件镦粗部分的高径比不能大于3，为满足这一条件，本文制定的解决方案为先镦粗后挤压的成型方案。先通过模具对锻件的保护，控制镦粗部分锻件的高径比小于3，然后在镦粗结束后对坯料进行挤压，从而得到零件。在模具设计过程中，使用了CAD、PRO/ENGINEER和DEFORM-3D等软件，其中利用DEFORM-3D模拟了坯料成型时的流动过程，通过模拟结果分析模具的受力情况及坯料的变形，并以此来改善模具结构。由于计算机技术的飞速发展和普及，通过使用上述软件之后，大大降低了生产成本、提高了模具精度、缩短设计周期。 关键词：长轴锻件；失稳；高径比；有限元模拟；模具 Abstract With the development of the times, the progress of science and technology,social production level rise ceaselessly, a lot of social needs to process the development and optimization of manufacturing industry. In the traditional upsetting forging, the ratio of height to diameter of forging is not greater than 3,otherwise the forgings will be instability and buckling occurred, this problem is a puzzling problem to enterprise. This paper is aimed at long axis forgings during upsetting this problem occurs instability and formulate relevant scheme and die design, in order to solve this problem, so as to improve production efficiency. The key to the mold is to control the ratio of height to diameter of upsetting part of long axis is not greater than 3, to meet this condition, solution for forming the blank is extrusion after upsetting. First through the mold on the forging of protection, control upsetting forging parts of the ratio of height to diameter is less than 3, then the blank upsetting extrusion in the end, in order to get the parts. In the mold design process, the use of CAD, PRO/ENGINEER and DEFORM-3D software, which use DEFORM-3D to simulate the flow process blank molding, through the analysis of deformati