目录目录................................................................................................11绪论............................................................................................71.1课题背景...........................................................................71.2机床改造的内容及意义...................................................81.2.1研究意义...................................................................81.2.2主要研究内容及技术路线.......................................81.3机床的经济型数控化改造主要解决的问题..................92数控系统的选择......................................................................103机械部分的改造......................................................................123.1滚珠丝杠的选择..........................................................133.1.1滚珠丝杠副的特点.................................................143.1.2.纵向滚珠丝杠螺母副的型号选择与校核步骤....153.1.3．横向滚珠丝杠螺母副的型号选择与校核步骤..183.2减速器箱体的设计......................................................193.2.1．轴的计算：（纵向输入轴）..............................203.2.2．减速器箱体尺寸..................................................213.3轴承的选择..................................................................253.3.1．选型......................................................................253.3.2校核.........................................................................263.4轴承盖的设计................................................................263.4.1闷盖........................................................................263.4.2通盖........................................................................273.5丝轴承的选型与校核....................................................283.5.1滚珠丝杠用轴承的选型.........................................283.5.2校核.........................................................................284.1纵向步进电机的选择....................................................324.1.1确定系统的脉冲当量.............................................324.1.2步距角的选择.........................................................324.1.3矩频特性：.............................................................334.1.4据步进电机的矩频特性计算加减速时间校核的快速性..................................................................................374.2横向步进电机的选择....................................................374.2.1步距角的确定.........................................................374.2.2距频特性.................................................................385自动回转刀架设计...................................................................415.1刀架的工作原理............................................................415.2蜗杆及蜗轮的选用与校核............................................425.2.1选择传动的类型.....................................................425.2.2选择材料和确定许用应力.....................................435.2.3按接触强度确定主要参数.....................................435.2.4蜗杆和蜗轮主要几何尺寸计算.............................445.3蜗杆轴的设计................................................................455.3.1蜗杆轴的材料选择，确定许用应力.....................455.3.2按扭转强度初步估算轴的最小直径.....................455.3.3确定各轴段的直径和长度..............
