以隐函数形式表示的柱形曲面五轴加工

机械论文编号:JX750  论文字数:19095.页数:52   附程序

目     录
摘     要 I
Abstract II
第一章   绪论 1
1.1概述 1
  1.2 国内外现状 2
1.3研究内容 3
1.4 研究目标    3
1.5 应用前景 3
 第二章   四轴和五轴数控铣床介绍 5
2.1 双转台机床 5
2.2 四坐标数控铣床与加工中心 7
2.3 五坐标数控铣床与加工中心 8
2.4 五轴数控联动 9
2.5 两轴数控旋转铣头 12
 第三章  曲面加工的加工刀具及加工方式 14
3.1用球头刀加工曲面 14
3.2用圆柱铣刀或圆锥铣刀加工曲面 15
3.3 圆环铣刀加工曲面 16
 第四章  切触概念浅释 17
4.1 切触（高阶接触）概念 17
4.2 切触（高阶接触）的含义深入解释 19
4.3 数控机床切触原理 21
 第五章   椭圆柱面曲面加工 24
5.1三坐标加工 24
5.2四坐标加工 27
5.3五坐标加工 29
第六章  程序及数据 31
6.1  Visual Basic 6.0的使用 31
6.2程序 32
第七章 三坐标曲面加工刀具轨迹计算 38
7.1  刀位计算 38
7.2刀具轨迹的生成方法 39
7.3走刀步长的确定 41
7.4走刀行距的确定 42
第八章 结论 45
致  谢 46
参考文献 47
附录  48

摘     要
    五轴数控加工技术在近年来发展相当快，特别是对复杂曲面的加工起到了不可替代的作用。工程中有很多复杂柱面，采用5坐标加工可高效达到所需形状，通过对柱面微分方程的推导，探索了加工刀具时线与线之间局部切触的基本理论，并详细探讨了刀具在此条件下的坐标定位问题。但是该技术在全球范围内一直没有得到普及，文章分析了目前五轴数控技术在全球范围内普遍存在的、难以解决的问题 ,分析了机床工业市场对五轴数控机床的需求以及发展五轴数控技术的必要性 ,并对其应用作出了展望。
 将切触（高阶接触）原理应用于曲面加工，如取接触线就沿刀具直母线，则刀具直母线应沿被加工面的渐近方向。对不可展直纹面，直纹线上每点的法矢方向不同，而圆柱直母线上每点线法矢方向相同，故有可能发生过切。按切触原理，可确定当接触线不沿刀具直母线时，刀具的最佳姿态。并按2阶切触原理，确定刀具的最佳姿态和最佳接触方向。可做到曲面2阶展开和3阶接触。
 
关键词： 复杂曲面   圆柱铣刀   切触   微分方程   五坐标

Implicit Function in the form of five-axis
machining of cylindrical surfaces
                      Abstract     Five-axis CNC machining technology in the development of a fairly rapid pace in recent years, especially for complex surface machining has played an irreplaceable role .   There are a lot of the complexity of the project cylinders, 5-coordinate high-performance processing can achieve the required shape, through the cylinder differential equation is derived to explore the processing line and the line when the tool between the local shear of the basic theory of touch, and dwelt at length on the tool Under these conditions the problem of the coordinates. But the technology at the global level has not been universal, the article analyzes the current five-axis CNC technology at the global level are preva lent, and difficult to resolve the problem, an analysis of the market's five-axis machine tool industry the demand for CNC machine tools and the development of five -axis CNC technology, the need for, and made the prospect of their application.     To touch (high-contact) principle applies to surface processing, such as from contact with the tool along the straight line on the bus, the bus should be along the straight tool is processed surface of the asymptotic direction. Exhibition of non-ruled surface, ruled line of the normal vector of each point in different directions, and the Spur Line bus every point the same direction as normal vector, so it may have been cut.In accordance with the principle of touch to determine when the contact line is not along the straight generatrix tool, the tool the best posture. Touch and 2-order theory, the best tool to determine the best exposure to posture and direction. 2-order surfaces can be carried out and 3-order contact.
.Key words：cylindrical  surface complex  five-axis   milling touch