精选课程名称机械制造技术基础双语A

教案 4 A 课程名称:机械制造技术基础双语 授课教师 谭庆昌 所在单位 机械学院机械制造系 07~08学年2学期2 课程类别 课堂理论教学 授课时间 周 2Cutting Processes and their Control 授课内容 2.1 Basic Theory of Cutting-tool 2.2 Deformation during the cutting process 授课对象 机械工程、车辆工程、汽运工程、 农业机械、交通工程专业本科生 时间 教学内容提要 分配 备注 Influence of the tool mounting b () 10分 position on working angles 钟 When the tool tip is higher or lower than the axis of the workpiece, the working rake angle and relief angle will change. 2-11 以图为例,如果刀尖安装得高于工件中心,实际工作前角将大于标注前角, 工作后角将小于标注后角。如果刀尖安装低于工件中心,则恰好相反。 When the mean line of the tool holder is not perpendicular to the feed direction, the working cutting-edge angleκ and the minor r ˊ κ. cutting-edge anglewill change r (Figure2.12) . 2.1.3Cutting-tool Materials Acutting-tool must have certain characteristics in order to produce good-quality and economical parts. 1. Certain characteristics that acutting-tool must have aHigh hardness and wear () 5分钟 resistance bEnough strength and toughness () cHigh heat resistance () dGood heat conductivity and thermal shock resistance () eGood processability () 2. Cutting-tool materials most in use High-speed steels (a) 20分 高速钢是加入了较多的钨()、钼()、铬()、钒()等合金元素的高合金 钟 ℃ 工具钢。高速钢具有较高的硬度()和耐热性,在切削温度高达时仍

腾讯文库精选课程名称机械制造技术基础双语A