设计简介
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。在制定工艺过程中，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。
关键词 工序，工艺，工步，加工余量，定位方案，夹紧力
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.Keywords： The process, worker one, worker's step , the surplus of processing, orient the scheme , clamp strength
目 录
摘 要..................................................................................................................................................................... I
ABSTRACT............................................................................................................................................................. II
目 录.................................................................................................................................................................. 1
1 后托架加工工艺............................................................................................................................................. 3
1.1 后托架的工艺分析..................................................................................................................................... 3
1.2 后托架的工艺要求及工艺分析................................................................................................................. 3
1.2.1 后托架的技术要求.............................................................................................................................. 4
1.3 加工工艺过程............................................................................................................................................... 4
1.4 确定各表面加工方案.................................................................................................................................. 4
1.4.1 在选择各表面及孔的加工方法时，要综合考虑以下因素......................................................... 4
1.4.2 平面的加工........................................................................................................................................... 4
1.4.3孔的加工方案........................................................................................................................................ 4
1.5 确定定位基准............................................................................................................................................... 5
1.5.1 粗基准的选择....................................................................................................................................... 5
1.5.2 精基准选择的原则.............................................................................................................................. 6
1.6 工艺路线的拟订........................................................................................................................................... 6
1.6.1工序的合理组合................................................................................................................................... 6
1.6.2 工序的集中与分散.............................................................................................................................. 7
1.6.3 加工阶段的划分.................................................................................................................................. 8
1.6.4 加工工艺路线方案的比较................................................................................................................. 9
1.7 后托架的偏差，加工余量，工序尺寸及毛坯尺寸的确定............................................................... 12
1.7.1 毛坯的结构工艺要求....................................................................................................................... 12
1.7.2 后托架的偏差计算............................................................................................................................ 12
1.8 确定切削用量及基本工时（机动时间）............................................................................................. 16
1.8.1 工序1：粗、精铣底面.................................................................................................................... 16
1.8.2 工序2 粗、半精、精镗CA6140侧面三杠孔......................................................................... 17
1.8.3 工序3：钻顶面四孔........................................................................................................................ 24
1.8.4 工序4：钻侧面两孔........................................................................................................................ 28
1.9 时间定额计算及生产安排....................................................................................................................... 30
1.9.1 粗、精铣底面.................................................................................................................................... 30
1.9.2 镗侧面三杠孔.................................................................................................................................... 31
1.9.3 钻顶面四孔......................................................................................................................................... 32
2 钻孔专用夹具设计.................................................................................................................................... 34
2.1 研究原始质料............................................................................................................................................. 34
2.2 定位基准的选择........................................................................................................................................ 34
2.3 切削力及夹紧力的计算........................................................................................................................... 34
2.4 误差分析与计算........................................................................................................................................ 36
结 论..................................................................................................................................................................... 38
参考文献................................................................................................................................................................ 39
致谢......................................................................................................................................................................... 40
