【作者】 李丹；

【导师】 赵晓明；

【作者基本信息】 上海交通大学 ， 机械制造及其自动化， 2007， 硕士

【摘要】 车铣常用来加工尺寸大、不便用车削加工的回转体表面。它是一种较新的加工工艺,因而加工参数对表面加工质量的影响并未完全揭示,这在一定程度上影响了车铣加工技术推广和应用。因而,研究车铣加工参数对表面形貌和粗糙度的影响,对于提高表面加工质量和加工效率,具有积极的现实意义。以往研究车铣加工表面质量常采用的方法是几何分析法,可以得出工件表面粗糙度的简易计算方法,但该方法不能得出工件表面的微观形貌,即不能得出表面粗糙度的分布规律。本文通过对轴向车铣加工的数学建模,开发了轴向车铣的表面形貌的计算机仿真系统。利用该系统,详细讨论了轴向进给速度、刀具与工件转速比、刀刃数、刀具尺寸和切深等因素对表面形貌和粗糙度的影响规律。得出上述影响规律后,将车铣加工仿真系统与正交试验法相结合,并在前人研究的基础上,进一步探讨了以上各加工参数对表面形貌和粗糙度的影响是相互独立还是相互制约,以及在多个加工参数同时变化的条件下,找出对工件表面形貌和粗糙度起主导作用的工艺参数,通过对此参数取合理的值,可以大幅提高加工表面质量。通过研究得出以下主要结论:(1)轴更多还原

【Abstract】 Work pieces, such as impellers and screws, are widely used in automobile, watercraft and spaceflight fields. It is hard to process them by turning because of their big sizes and unique shape. But turn-milling is a good choice. The work pieces needn’t rotate in a high speed, so the big size and unique shape are no longer problems. Besides, the quality is good. So turn-milling is more and more widely used.As a new process way, turn-milling’s rules are not as clear as other traditional processing ways. Although it can get good quality, the efficiency is not so satisfying. So it is very necessary to discovery the rules of turn-milling in order to choose reasonable processing parameters.According to the positions of the tool and work piece, turn-milling can be classified into axial and perpendicular turn-milling. Many researchers has been working on them based on geometric analysis. Geometric analysis is a method of attaining the machined surface roughness by computing the relative geometric position of work piece and tool. But it is hard to access the surface texture in this way. The issue is solved with computer simulation system.The computer simulation system for axial turn-milling machined surface texture was developed based on a mathematical model of the axial turn-milling process. With the simulation system, quantitative analysis of machined surface and the relationship between the machined surface texture and axial feed rate, ratio of rotational speed, number of tool edges, radius of tool, and the depth of cutting can be carried out to find more accurate rules of turn-milling process.更多还原