机械制造技术课程设计任务书..............................................................................................................2一、左摆动杠杆的工艺分析..................................................................................................................31.1左摆动杠杆的用途....................................................................................................31.2左摆动杠杆的技术要求....................................................................................................31.3左摆动杠杆的工艺分析...........................................................................................41.4确定左摆动杠杆的生产类型.................................................................................4二、确定毛坯、绘制毛坯简图..............................................................................................................52.1选择毛坯............................................................................................................................52.2确定毛坯的尺寸公差和机械加工余量............................................................................5三、拟定左摆动杠杆工艺路线..............................................................................................................63.1定位基准的选择................................................................................................................63.2表面加工方法的确定........................................................................................................73.3加工阶段的划分................................................................................................................73.4工序的集中与分散............................................................................................................83.5工序顺序的安排................................................................................................................83.6确定工艺路线....................................................................................................................8四、加工余量、工序尺寸、和公差的确定........................................................................................104.1选择加工设备与工艺设备..............................................................................................104.2加工余量工序尺寸及公差的确定..................................................................................11五、切削用量、时间定额的计算........................................................................................................145.1粗精铣宽24mm，毛坯28mm，的下表面........................................................................145.2孔的加工..........................................................................................................................165.3铣槽.................................................................................................................................205.4时间定额的计算..............................................................................................................20六、填写机械加工工序卡....................................................................................................................232机械制造技术课程设计任务书一、题目：左摆动杠杆机械加工工艺规程设计二、原始数据典型机械零件图1张，零件图上尺寸、公差及技术要求较齐全。三、主...
