直纹

A ruled surface of revolution formed by an edged circle as the guide element is proposed in the category of basic geometrical bodies.

摘要在基本几何体的范畴内，提出一种以棱圆为导元素的直纹曲面。

Finally, tested and verified the algorithm with examples of ruled surface, cone-shaped face and free surface, and compared with triangulation linear interpolation method.

最后以直纹面、锥形面和自由曲面为算例分别对算法进行计算验证，并与线性插值三角网格法进行对比。

Some studies based on machining complex ruled surface by means of WEDM and machining spherical parts through WEDM with rotary electrode are carried out to check the correctness of picture simulating results.

为了检验图形仿真结果的正确性，本文对各种复杂曲面电火花线切割加工系统加工复杂直纹曲面零件和回转电极展成电火花加工球面零件的过程进行了实验研究。

Simulating picture programs corresponding to typical motion types of WEDM process in machining complex ruled surface are designed with structural mode.

选择了十分适用于计算机图形仿真的VC语言作为复杂直纹曲面电火花线切割加工仿真编程语言。

After some experimental results obtained in machining samples with complex ruled surface, concave spherical surface, convex surface and samples with both concave and convex surface are analyzed, the value of these samples in practical prodúction is discussed.

通过对一些典型的复杂直纹曲面样件以及凹球面、凸球面和凸凹复合球面样件加工实验分析，探讨了这些样件在实际生产中的应用价值。

Its principle is based on that there are some rdationships between curvatures of the theoretical profile surface and the real profile surface Curvatures of theoretical profile surface,which is a ruled surface,are easy to get.

该方法利用等距曲面间的曲率关系进行凸轮廓面曲率的解析计算。由于理论廓面是直纹面，其廓面曲率容易求得。

Arithmetics and implements of function modules are indicated as follows:In the modeling module, the twist ruled surface formed blade is constructed using B-spline interpolation technique.

造型模块中，采用三次B样条插值的技术，构造出叶片盖盘与轴盘曲线，建立了扭曲直纹面形式的叶片型面。

The approach of this paper is suitable for carrying out prediction of cutting forces for flank milling ruled surface under reserving uniform material to cut by using five-axis machine. And it can effectively provide the suggestions of process planning for five-axis flank milling operation.

本文方法适用於直纹曲面在预留均匀的余料下，进行五轴侧铣切削力预测，可有效提供五轴侧铣切削的切削条件规划。

Cutter blade in the face of the modeling, this paper presents a basic model of ideological confrontation flank milling reasoning and mathematical algorithm: First, the establishment of the cutter edge cross-section curve and the equation ruled surface and then through the algorithm to generate cutter rake face and the flank, Bezier curve-based algorithm to generate the surface of the spiral groove cutter in order to achieve the opposite blade face milling modeling.

在立铣刀的刃面的建模方面，本文提出了一种基本的建模思想对立铣刀的刀面进行数学推理和算法实现：首先建立立铣刀的刃口曲线及横截面的方程，然后通过直纹面生成算法建立立铣刀的前刀面和后刀面，通过基于Bezier曲线的曲面生成算法建立立铣刀的螺旋槽，从而实现了对立铣刀刃面的建模。

The catenoids are the only nonplanar minimal surface of roation, the right helicoids are the only skew ruled minimal surface of roation, but they can not be represented in form of NURBS.

悬链面是唯一的旋转极小曲面，正螺面是唯一的直纹极小曲面表示，它们在建筑和机械制造行业有广泛应用，但是它们都不能用NURBS精确表示，这个工程应用带来很多不便。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。