铣拨叉(CA6140)16mm槽铣床专用夹具设计..docVIP

题 目：铣拨叉（CA6140））1．运用所学基本理论知识，正确解决工件在加工时的定位和夹紧问题，选择合理的方案，进行必要的计算，根据题意设计出符合低成本夹具。2．收集有关资料，掌握正确的夹具设计思想、方法和手段，学会正确使用有关手册及其它技术资料。3．分析研究结构工艺性问题，提高结构设计能力。4．进一步了解有关机床、刀具和量具等工装知识。 Abstract The course design is the subject of a lathe CA6140 Bocha 16 mm slot for milling fixture design, through the design, so that school textbooks to the theoretical knowledge in this practice be in the curriculum design, machinery manufacturing base of knowledge to go to school textbooks, such as , Positioning errors, machine types of choice, the choice of processing methods, the folder should pay attention to the specific design issues, in the course design have been applied to increase its ability to integrate theory with practice: 1. By the use of basic theoretical knowledge, the correct solution in the processing of the workpiece positioning and clamping problem, a reasonable choice of programmes, carry out the necessary calculations, based on that design intended to meet the requirements of low-cost fixture. ???? 2. To collect relevant information, have the right fixture design ideas, ways and means to learn the correct use of the manuals and other technical information. ???? 3. Analysis of the structure of issues, enhance structural design capacity. ???? 4. Learn more about machine tools, cutting tools and measuring tools, such as the tooling knowledge. 目 录 1拔叉的工艺分析及生产类型的确定 1 1.1拔叉的用途 1 1.2拔叉的技术要求 1 1.3审查工件的工艺性 1 1.4确定拔叉的生产类型 2 2确定毛坯，绘制毛坯简图 2 2.1选择毛坯 2 2.2确定毛坯的尺寸公差和机械加工余量 2 2.3绘制拔叉铸造毛坯简图 3 3拟定拔叉工艺路线 4 3.1定位基准的选择 4 3.1.1精基准的选择 4 3.1.2粗基准的选择 4 3.2表面加工方法的确定 4 3.3加工阶段的划分 5 3.4工序的集中与分散 5 3.5工序顺序的安排 5 3.6确定工艺路线 6 4加工余量、工序尺寸和公差的确定 6 5切削用量、时间定额的计算 7 5.1切削用量的计算 8 5.1.1工序8——粗铣槽底面和两侧面 8 5.1.2工序9—精铣槽底面和两侧面 8 5.2时间定额的计算 8 5.2.1基本时间的计算 8 5.2.2辅助时间的计算 9 5.2.3其他时间的计算 9 5.2.4单件时间的计算 9 6专用铣床夹具设计 10 7课程设计体会 11 1拔叉的工艺分析及生产类型的确定 1.1拔叉的用途 题目所给的零件是CA6140车床的拔叉。它位于车床变速机构中，主要起换档，使主轴回转运动按照工作者的要求工作，获得所需的速度和扭矩的作用。零件下方的φ25孔与操纵机构相连，二上方的φ55半孔则是用于与所控制齿轮所在的轴接触。通过下方的力拨动上方的齿轮变速。两件零件铸为一体，加工时分开。