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精镗连杆大小端孔夹具设计
摘  要
      连杆是发动机运动的主要关键件之一，它工作的稳定性、可靠性对发动机的整机质量至关重要，质量轻、精度高的连杆，有助于降低发动机的能耗和噪声。本文在研究了国外内燃机连杆的基础上，根据我国发动机连杆加工的现状，以及连杆结构的特点和精度要求，分析了如何对连杆加工基准进行合理选择；如何确定夹紧力的方向和着力点；如何合理选择各部位加工方式及工艺流程；给出了各工序加工余量的确定方法；并重点分析了影响连杆加工精度的主要原因。从对发动机连杆机械加工工艺过程、加工余量和工序尺寸的计算、发动机连杆的镗孔质量和发动机连杆胀断工艺等方面进行了深入的分析和研究，为连杆的生产提供了理论依据。
关键词: 变形；镗孔夹具设计；连杆；加工工艺；

ABSTRACT
Diesel engine connecting rod is the key piece of sports, it works the stability, reliability is critical to the quality of the diesel engine machine, light weight, high precision, connecting rod, help reduce energy consumption and engine noise. Based on the study abroad on the basis of engine connecting rods, connecting rod according to the status of China diesel engine, and link structure, characteristics and accuracy analysis of how the baseline of the connecting rod reasonable choice; how to determine the direction of clamping force and focus; how to choose the parts of processing methods and process; shows the method for determining the allowance of the procedure; and analyzed the accuracy of the main connecting rod. From the diesel engine connecting rod machining process, the calculation of allowances and the process dimension, the connecting rod bore diesel engine connecting rod expansion of quality and technology and other aspects of off-depth analysis and research, provided for the connecting rod production theoretical basis.
Keyword: Connecting rod；Deformination；Processing technology；Design of clamping device boring

目  录
1序   言 1
2夹具加工工艺 1
2.1结构特点 1
2.2主要技术要求 2
2.2.1大、小头孔的尺寸精度、形状精度 2
2.2.2连杆大头孔两端面对大头孔中心线的垂直度…………………………………...2
2.2.3大、小头孔轴心线在两个互相垂直方向的平行度 2
2.2.4大、小头孔两端面的技术要求 2
2.2.5大、小头孔中心距 2
2.3机械加工工艺过程 3
2.4材料和毛坯 3
3 夹具设计 4
3.1注意事项 5
3.2夹具设计 5
3.2.1定位基准的选择 5
3.2.2夹紧方案 5
3.2.3大、小孔夹具体设计 5
3.2.4年生产纲领 5
3.2.5工时定额的计算 6
3.2.6切削力及夹紧力的计算 6
3.2.7气缸的选择和设计 8
4 结  论 9
参考文献 10
致    谢 11