变速箱体加工工艺及夹具设计技术文件.doc

高等教育自学考试本科毕业论文 变速箱体加工工艺及夹具设计 准考证号: 5 专业层次: 本科 院 (系) 机械与动力工程 指导教师: 职 称: 讲师 重庆科技学院 二O一二年一月十五日  高等教育自学考试本科毕业论文 变速箱体加工工艺及夹具设计 考生姓名: 准考证号: 专业层次: 指导教师: 院 (系):机械与动力工程 重庆科技学院 二O一二年一月十五日 摘 要 在生产过程中,使生产对象(原材料,毛坯,零件或总成等)的质和量的状态发生直接变化的过程叫工艺过程,如毛坯制造,机械加工,热处理,装配等都称之为工艺过程,要确定各工序的安装工位和该工序需要的工步,加工该工序的机车及机床的进给量,切削深度,主轴转速和切削速度,该工序的夹具,刀具及量具,还有走刀次数和走刀长度,最后计算该工序的基本时间,辅助时间和工作地服务时间变速箱主要是加工表面和轴孔,此外轴孔加工不但要达到孔本身的尺寸精度要求,还要保证与其他轴孔的相互位置精度,这些零件盒组件的装配精度在很大程度上取决于箱体本身的 精度箱体的加工质量还会影响到传动性夹具是机床的重要组成部件是根据机床的工艺和结构方案的具体要求而设计的,夹压,刀具的导向,以及装卸工件时限位等等作用的,为保证加工过程的稳定性;夹具结构应力求简单紧凑,轻便且安全,悬伸长度尽量小,使重心靠近主轴前支承,夹具体应制成圆形,加具体上的各元件不允许伸出夹具体直径之外,夹具的结构还应便于工件的安装关键词:工序,工位,工步,加工余量,定位方案,夹紧力,稳定性,安装,排出,清理,轴孔,精度 ABSTRACT Enable producing the target in process of production (raw materials, the blank , state of quality and quantity on part become always ) take place direct course of change ask craft course, if the blank is made, machining, heat treatment , assemble etc. and call it the craft course. In the course of making the craft , is it confirm every erector location and worker step that process need this of process to want, the locomotive of processing , this process , and the entering the giving amount of the lathe, cut depth , the rotational speed of the main shaft and speed of cutting, the jig of this process, the cutter and measuring tool, a one hundred sheets of number of times still leaves and a one hundred sheets of length leaves, calculate basic time of this process , auxiliary time and service time of place of working finally. The gearbox is the main processing surface and the shaft hole, in addition the shaft hole processing must not only reach the hole itself dimension precision requirement, guarantee and other shaft hole position accuracy. In addition the gearbox also provided with bearings, gear, gear and other components, these components box component assembly precision depends to a great exten