【作者】 王坤；

【导师】 毛昕；

【作者基本信息】 东北大学 ， 机械设计及理论， 2006， 硕士

【摘要】 科学技术的发展给各行各业都带来了很大的改变，制鞋业，毫不例外也得到了相当大的推动。将CAD技术引入到鞋的设计制造中对提高整个制鞋行业的水平都具有重要的意义。但由于目前国内的鞋业CAD技术并不十分完善，本文在分析该领域的研究现状和存在的问题的基础上，主要做了以下几个方面的工作： 由于鞋楦是制鞋工艺中皮鞋款式的基准，是制鞋的基础，因此本文首先建立了鞋楦的CAD模型。鞋楦是一个由复杂的不规则曲面所组成的自由型闭合曲面体，通常鞋楦的设计分为“正向设计”和“逆向设计”两种方法，本文采用了“逆向设计”方法，即通过表面测量获得鞋楦表面数据，然后进行基于测量点的模型重建，得到数字化的鞋楦模型。鞋楦模型的精确建立，为后续的制鞋工作奠定了基础。 楦面展平，针对这个问题一直以来制鞋工作者们都在积极寻求更准确更快速的解决方法。目前，国内外鞋样设计的楦面展平方法有多种，都各有特点。本文提出的楦面展平方法将楦面关键部位的特点与某种曲面展开算法结合起来，首先确定鞋楦曲面上的关键部位点，然后据所确定的关键部位点进行网格划分，以网格为基础，采用曲面展开算法——三角线法结合最佳展开基点理论展平楦面。在展平过程中，为了使展平结果更准确，本文对多种网格划分情况以及展开基点的位置对展平结果的影响进行了误差分析，从中优选出较佳的网格划分方式和较佳的展开基点位置，并将该展平结果与传统的楦面展平方法——三角逼近作图法得到的展平结果进行了形状上的比较，最终得到了较为理想的楦面展平图。 在鞋帮样的设计过程中，如何能让设计师在二维与三维之间进行随心所欲的交互设计，一直是计算机辅助鞋样设计研究并期望得到更好解决的问题，本文对此进行了比较深入的研究。为了在计算机上实现二维、三维之间双向设计的思想，本文在二维展开平面与三维楦面之间建立了一种映射关系，应用变换理论以及NURBS曲面的u，V两个方向的参数实现了二者间点对点的精确对应，并根据该对应关系完成了鞋的二维帮样板与三维楦面之间帮样线条的交互创建和修改功能，从而为鞋的帮样款式设计带来了很大方便，并应用帮样线条交互创建和修改功能给出了整鞋设计的样例。更多还原

【Abstract】 The technical development of science all brings many changes for every trade, shoe industry necessarily also is subjected to the serious impact.Leading the technique of CAD into design and manufacture of shoe industry has the important meaning for raising the levels of the whole shoe industry.At present,CAD technique of shoe industry is not perfect, on the basis of the analysis of its status quo and the problems remained,the work has been done in the paper is as follows:Because shoe last is the basis of shoe style in making the shoe craft, also is benchmark of shoe style in the shoemaking technology, so shoe last model is reconstructed firstly in this paper. The geometric model of shoe last is a typically composed of free form surfaces rather than basic geometric shapes, the design of the shoe last is usually divided into two methods which are" positive design" and" reverse design", this paper adopts the method of reverse design", i.e.acquires the shoe last surface data through the surface measurement system, then reconstructs model according to the points data, gets the shoe last digital model at last.The accurate establishment of the shoe last model is the function for shoemaking later.Shoe last flattening has been a hotspot in the area of shoemaking. At present, there are many shoe last flattening methods for shoe pattern design, all each have the characteristics. In this paper,the new shoe last flattening method is put forward which combined the characteristics points of the shoe last with some surface flattening arithmetic, the shoe last is flattened by the surface flattening arithmetic which namely triangle method combines the theory which is best flattening base point together. In the process of flattening, the error analysis is done for parameterizing meshes and changing flattening base point ,then the best mesh and flattening base point are selected. The contrast is implemented between the flttening result by the method which is introduced in this paper and the graphics which is done by the traditional shoe last flattening method which namely trigonal construct method, thereby gets the more reasonable result of shoe last surface flattening.In the shoe pattern design process, the problem which how to realize interactive design freely between 2D and 3D is always expected to resolve better in computer aided shoe pattern research. So it is studied deeply in this paper. To realize the interactive design thought更多还原