目 录
摘要…………………………………………………………………………1
关键词…………………………………………………………………………1
1前言………………………………………………………………………………2
2曲轴的工艺分析及生产类型的确定…………………………………………2
2.1曲轴的作用及工作状况…………………………………………………2
2.2曲轴的工艺分析…………………………………………………………3
2.3曲轴的生产类型…………………………………………………………3
3选择毛坯,确定毛坯尺寸…………………………………………………4
3.1毛坯材料及其制造工艺…………………………………………………4
3.1.1毛坯的材料……………………………………………………………4
3.1.2毛坯的制造工艺………………………………………………………4
3.2毛坯尺寸的确定…………………………………………………………5
3.3确定毛坯尺寸的公差……………………………………………………6
4选择加工方法,制定加工路线………………………………………………6
4.1定位基准的选择…………………………………………………………6
4.2零件表面加工方法的选择………………………………………………7
4.3制定工艺路线……………………………………………………………7
5工序设计………………………………………………………………………8
5.1选择加工设备与工艺装备………………………………………………8
5.2确定工序尺寸……………………………………………………………11
5.2.1加工小端外圆柱面 ……………………………………… 11
5.2.2加工小端外圆柱面………………………………………11
5.2.3加工法兰外圆柱面………………………………………12
5.2.4加工主轴颈外圆柱面……………………………………12
5.2.5加工连杆轴颈外圆柱面…………………………………13
6确定切削用量及基本工时…………………………………………………13
6.1切削用量…………………………………………………………………13
6.2基本时间的确定…………………………………………………………14
7曲轴加工质量研究…………………………………………………………16
7.1曲轴的加工方法…………………………………………………………16
7.1.1曲轴加工工艺的发展…………………………………………16
7.1.2曲轴轴颈加工工艺分析………………………………………18
7.2热处理和表面强化处理…………………………………………………22
7.2.1热处理和强化工艺………………………………………………22
7.2.2滚压工艺参数对曲轴疲劳强度的影响…………………………23
7.3曲轴加工设备……………………………………………………………25
8夹具设计……………………………………………………………………25
8.1铣两端面夹具设计…………………………………………………………25
8.2钻斜油孔夹具设计…………………………………………………………26
9结论…………………………………………………………………………26
参考文献 ………………………………………………………………………27
致谢……………………………………………………………………………28
附录…………………………………………………………………………28
摘 要: 三拐发动机广泛应用于工程机械、船舶和发电机中。发动机中最重要的部件当属曲轴。由于曲轴工作条件恶劣,因此对曲轴材质以及毛坯加工技术、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。本设计主要进行三拐曲轴的加工工艺路线的编制以及关键工序的夹具设计,通过曲轴加工工艺路线的编制以及有关工序夹具设计,对影响曲轴加工质量的因素加以研究并提出针对性的改进方案,以提高产品质量和生产率。
关键词:三拐; 发动机; 曲轴; 加工工艺路线; 夹具设计; 加工质量
Design of three Crankshfat’s Processing and Fixture
Abstract: Diesel Engines are widely applied in automobiles, engineering machinery, ships and generators. Without doubt, the crankshaft should be the most important part in engines. As crankshafts always work in poor conditions, it is necessary to be strict to the material, the blank processing, the accuracy, the surface roughness, the heat treatment, the surface intensification and the dynamic balance of crankshafts. This project aims at the compiling of the processing line of crankshafts and the fixture design of the critical process. Through the compiling and the design, I will figure out the factors that affect the quality of crankshaft machining and propose specific improvement so as to enhance the quality of products and productivity.
Key words:; engine; crankshaft; the processing line; the fixture design; the quality of crankshaft machining