【作者】 王猛；

【导师】 牛文铁；

【作者基本信息】 天津大学 ， 机械制造及自动化， 2009， 硕士

【摘要】 钛合金材料的切削性能较差,如何提高切削效率成为研究重点。插铣方法因其独特的走刀方式和切削特点,在钛合金的型腔加工过程中可以很好的金属切屑去除率进行切削加工,受到普遍的关注和研究。本文针对插铣加工Z向切削的特点,对插铣刀具轨迹生成方法进行研究,并基于对填充圆网格划分的改进,提出综合环切特点的型腔插铣加工刀具轨迹的改进填充圆法生成策略,实现了插铣加工的高效快速切削。主要研究内容如下:1.基于二维型腔的结构以及插铣加工走刀方式的特点,针对对填充圆刀位点生成的覆盖区域不充分的缺陷,提出网格增补改进方法,并基于此对插铣刀具轨迹规划进行研究,提出插铣刀具轨迹生成的填充圆网格法。2.系统研究插铣刀具轨迹生成的过程和方法,提出参考刀具轨迹的概念,即刀位点的初始连接顺序。利用遗传算法对参考刀具轨迹进行优化,针对刀位点产生后的间距偏大的问题,采用刀位点插值,改善刀具的径向切削宽度。3.结合环切法刀具轨迹生成的特点,提出一种插铣刀具轨迹的实用性调整方法,该方法可以有效避免在切削过程中由于走刀方向改变造成的加工余量不均匀。4.研究插铣加工工艺过程,总结刀具和切削用量的选择规则及知识,提出根据型腔几何形状交互选择多刀具的方法。5.在上述研究的基础上,开发基于填充圆网格方法的插铣加工刀具轨迹生成及优化软件功能模块,并结合具体实例,阐述软件运行过程,验证所提出方法的正确性和可行性。更多还原

【Abstract】 In recent years, how to improve the cutting efficiency becomes the key problem for Titanium alloy parts processing operation because of whose poor machinability. Plunge milling plays an important role in Titanium alloy machining because it has good chip metal removal rate with a unique type of movement, and is extensively studied. In this thesis, tool path generation methods are studied considering the characteristics of Z-direction cutting; a novel strategy of tool path generation integrating with contour-parallel method is proposed based on Ocfill (Overlapped Circle Filling) method and its improvements; so that high-efficient and fast cutting of plunge milling for Titanium alloy can be realized. The main contents are as follows:1. Based on the structure of the cavity and the movement type of plunging, enhancing method is putted forward for the defection of the Ocfill grid to get more reasonable cutter sites. With the result, path generation method with Ocfill gird is studied.2. The process of path generation is studied and the concept of reference path, witch is the original trail of the cutter, is used and optimalized with Generic Algorithm. The depth of the cutter in radial direction is modified with inserting tool sites.3. To get good result, an adaptable method is put forward witch is based on the way of boundary-parallel machining. In this method, the uniformity of left material is modified.4. The technics of plunge processing is studied. The principles and knowledge of cutter selection and cutting parameters are summarized. The minimum tool is to be selection according to the pocket geometry and the series of larger tools are chosen based on this one.5. On the basis of abovementioned theories and methods, the CAM software of plunge milling with Ocfill grid method to generate cutter path is developed, and its feasibility is illustrated with examples.更多还原