钛合金切削研究 毕业论文.docVIP

摘 要 本文对钛合金的性能进行了介绍。钛合金在切削过程中变形系数小，切削温度高，是一种典型的难加工材料。因此，研究钛合金的切削性能，提高加工效率具有重要的意义。 在金属的切削过程中切削力和切屑控制是反映材料切削加工性的主要指标。本文利用有限元软件DEFORM-3D仿真TC4钛合金的车削过程，得到了切削力与切削温度的变化曲线，并知道切削过程中切削力是先波动再周期性稳定的。借用正交试验法获得多组仿真数据，分析得出了切削力的经验公式。通过研究切削力与切削参数的变化规律发现切削过程中切削力是随着切削速度的增大而减小，随着切削深度和进给量的增大而增大的。 本文建立的切削过程有限元模型可以用来预报切削力，为钛合金切削研究提供相关参考。因此，它具有重大而深远的意义。 关键词：钛合金；高速切削；切削力；DEFROM-3D Abstract The paper introduce the properties of Titanium alloys. Because of the natures of small coefficient of deformation and high tempreture of cutting in the cutting process, Titanium alloys named a typical material that is difficult to process . Therefore, it’s of great significance to study machinability of titanium alloys for improve the processing efficiency. Cutting forces and chip control are the major indexes reflecting cutting process. The paper uses finite element software DEFORM-3D to emulate TC4 Titanium alloy’s turning process and abtains the changing curve of cutting forces and temperatures, and know that cutting forces are undulate before steady. Getting several groups of emulate figures with the help of orthogonal experiment ways. By studying the changing regular pattern of cutting forces and cutting parameter, finding when cutting speed raises, cutting processes reduces .When depth of cutting changes deeper and feed of cutting changes bigger, it becomes bigger. The paper’s finite element model that developed in the cutting processes can be used to preforcast cutting forces, and provides some related reference to Titanium alloy cutting research . So , it has important and lasting significance. Keywords: Titanium alloys; High-speed cutting ;cutting forces;DEFROM-3D 目 录 摘 要 I Abstract II 目 录 III 1 绪论 1 1.1 课题背景和意义 1 1.2 国内外研究现状 3 1.3 钛合金的性能特点 4 1.3.1 钛及钛合金 4 1.3.2 钛合金分类 5 1.3.3 钛合金特性 6 1.3.4 钛合金的切削特点 6 1.3.5 钛合金的热处理 7 1.3.6 钛合金Ti-6Al-4V的物理性能 8 1.4 本课题的研究内容和方法 9 1.5 本章小结 10 2 有限元软件DEFORM介绍 11 2.1 有限元仿真软件种类 11 2.2 DEFORM的适用范围和对象 11 2.3 DEFORM的特色功能与价值 12 2.3.1 DEFORM的特色功能 12 2.3.2 DE