曲轴加工工艺及夹具设计.doc

PAGE PAGE I 攀枝花学院本科毕业设计（论文） 摘要 另配有设计图纸cad.proe. Qq275673028 曲轴是柴油发动机的重要零件。它可以是有若干个相互错开一定角度的曲柄（或曲拐）加上功率输出端和自由端构成的。每个曲柄又是由主轴颈、曲柄销及曲柄臂组成。曲轴的作用是把活塞的往复直线运动变成旋转运动，将作用在活塞的气体压力变成扭矩，用来驱动工作机械和柴油机发动机各辅助系统进行工作，曲轴在工作时承受着不断变化的力，惯性力和它们的力矩作用，受力情况十分复杂。其精度要求非常高，它的加工质量对内燃机的工作性能，对装配劳动量都有很大影响。因此，各要素的尺寸精度，位置精度和表面质量要求相当高。曲轴中几个主要加工表面，连杆表面，轴承轴颈及锥面键槽的精度要求都较高，连杆轴颈需经过抛光，所以研究曲轴加工工艺及夹具设计对曲轴的生产具有一定的实际意义。 关键词 发动机，受力情况，精度，加工工艺，夹具设计 ABSTRACT The crankshaft is one of the important parts of diesel engine. It could be several staggered Angle of crank (or crank) plus the power output end and free end. Each of the cranks is composed of main journal, crank pin and crank arm. Crankshaft is the function of the reciprocating linear motion of the piston into rotary motion, the effect on piston gas pressure become torque, work used to drive machinery and diesel engine work of auxiliary systems, each crankshaft under changing at work force, inertia force and the moment, stress distribution is very complex. Its accuracy is very high, its processing quality of the performance of internal combustion engine, labor has a great influence on assembly. As a result, the size precision of each factor, high position precision and surface quality requirement. Surface of a few main processing surface in the crankshaft, connecting rod, bearing journal and cone keyway accuracy is higher, connecting rod shaft neck should be after polishing, so the processing technology of crankshaft crankshaft production has a certain practical significance. Keywords engine，stress distribution，precision，processing technology，fixture design 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc388052826 摘要 PAGEREF _Toc388052826 \h I HYPERLINK \l _Toc388052827 ABSTRACT PAGEREF _Toc388052827 \h II HYPERLINK \l _Toc388052828 1 绪论 PAGEREF _Toc388052828 \h 3 HYPERLINK \l _Toc388052829 1.1 本课题的研究意义，发展趋势及技术展望 PAGEREF _Toc388052829 \h 3 HYPERLINK \l _Toc388052830 1.1.1 研究意义 PAGEREF _Toc388052830 \h 3 HYPERLINK \l _Toc388052831 1.1.2