车削加工有句行话:“三分手艺,七分刀具。”“七分刀具”是指车刀刃磨角度的确定,它直接影响到产品质量的优劣和生产效率的高低。因此,在车工工艺学或车工实习教学中,如何合理选择车刀角度都是教学中的重点和难点。为了使学生在学习掌握这部分知识时,更易理解和接受,能将抽象的空间角度转换成具体直观的角度,达到良好的教学效果, Turning has a jargon: “thirds craft, seven knives.” “Seven knives” refers to the determination of sharpening angle, it directly affects the quality of products and the level of production efficiency. Therefore, in the car mechanics or lathe practice teaching, how to choose a reasonable angle lathe teaching are the focus and difficulty. In order to enable students to learn this part of knowledge, easier to understand and accept, the abstract perspective of space can be converted into a concrete and intuitive perspective, to achieve good teaching results,