曲轴加工工艺设计 毕业设计(论文).doc

曲轴加工工艺设计 摘 要 曲轴是发动机中承受冲击载荷、传递动力的重要零件，由于曲轴服役条件恶劣，因此对曲轴材质，毛坯加工技术、精度、表面粗糙度、热处理和表面强化、动平衡等要求都十分严格以期提高产品的竞争力。CRANK SHAFT PROCESSING TECHNOLOGY ABSTRACT The crank shaft is to launch to bear pound at to carry a lotus and deliver in the machine motive of importance spare parts, because of the crank shaft undergo military service a condition bad, so to crank shaft material, semi-finished product processing technology, accuracy, surface rough degree, hot processing and the surface enhance, move balance etc. request all very strict. Therefore want to draw up reasonable of process a craft, want first according to request choice reasonable of semi-finished product, in the process of process in want to choose reasonable of process equipments and knife, tongs, quantity and measure method, want to carry on to process a work preface design in process the craft, process size, time settle sum of calculation, the spare parts process to want design reasonable of appropriation tongs. Accompany with crank shaft to process a develop of craft, process a method to not only improve, process a method more and more advanced, so the crank shaft of design reasonable process a craft and pack to clip of tongs, not only can raise to process accuracy, but also can raise production efficiency, the cost for lowering produce thus with expect exaltation product of competition ability. KEY WORDS: Crank shaft, Technology, Jig 目　录 前　言 1 1 曲轴的作用 1 2 发动机曲轴加工工艺的历史发展演变 1 3 曲轴加工工艺现状 3 第1章 零件加工工艺设计 4 1.1 零件工艺分析 4 1.2 零件加工特点及解决方法 5 1.2.1 零件加工特点 5 1.2.2 加工零件采取的措施 6 1.3 确定毛坯 6 1.3.1 确定毛坯 6 1.3.2 确定机械加工余量 6 1.4 设计毛坯图 8 1.4.1 确定毛坯尺寸公差 8 1.4.2 确定圆角半径 9 1.4.3 确定拔模角度 10 1.4.4 确定分模位置 10 1.4.5 确定毛坯及毛坯的热处理方式 10 1.5 加工工艺路线拟定 10 1.5.1 主要技术要求 10 1.5.2 加工方法 10 1.5.3 加工顺序的安排 11 1.6 加工工序设计 13 1.6.1 工序20铣侧面及底面 13 1.6.2 工序40粗主轴颈，工序50精车主轴颈 14 1.7 工件中孔的加工 15 1.7.1 工件中的孔和螺纹孔的精度和加工步骤 15 1.7.2 工序80中钻、铰，攻丝至M12 16 第2章 热处理工艺设计 18 2.1 35CrMo热处理的技术要求 18 2.2 调质工艺与用材分析 18 2.2.1 调质工艺参数的确定 18 2.2.2 组织性能的分析 19 2.3 去应力退火工艺 20 2.4 表面处理及用材分析 21 2.