对制图类课程中某些概念的再研究

Rediscussion about Some Concepts in Drawing Courses

继文献[1], [2],对制图课程中另一些概念的确切表述进行了研究,主要有投影法,投影轴和投影连线,用迹线表示平面,空间几何元素及其投影,交线、棱线、截交线、相贯线,立体表面交线的可见性,立体、基本立体、组合体,立体图,主向灭点、主灭点、主点,一点透视,阴和影,视图、基本视图,常用件等。提出了较为确切的表述,指出了一些表述不够确切、严谨的问题。对这些问题的继续深入研究讨论,十分有利于课程和教材的质量和水平的不断提高,为精品课程和教材建设创造了条件和基础。

Continuing to the documents [1], [2] listed in the References, this article researches the exact descriptions of some concepts in engineering drawing course. They are projection method, projection axis and projection line, plane expressed by traces, space geometry elements and their projections, intersection line, line of prism, line of section, line of intersection, the visibility of the lines of solid surfaces, solid, basic solid, combined solids, the drawing of solid, vanishing point of main direction、main vanishing point、main point, one-point perspective, shade and shadow, view and basic view, common parts. It also gives the exact descriptions of the concepts and points out some problems about the description ambiguity. The research and discussion about these problems will be helpful to improve the quality of the course and teaching material, and establish the condition and basis for refined course and teaching material.