攀枝花学院毕业设计(论文)
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目 录
摘要 ....................................................................................................................3
第一章 汽车连杆加工工艺 .................................................................................4
1.1 连杆的结构特点 .........................................................................................4
1.2 连杆的主要技术要求 .................................................................................4
1.2.1 大、小头孔的尺寸精度、形状精度 ...............................................5
1.2.2 大、小头孔轴心线在两个互相垂直方向的平行度 .......................5
1.2.3 大、小头孔中心距 ...........................................................................5
1.2.4 连杆大头孔两端面对大头孔中心线的垂直度 ...............................5
1.2.5 大、小头孔两端面的技术要求 .......................................................5
1.2.6 螺栓孔的技术要求 ...........................................................................6
1.2.7 有关结合面的技术要求 ...................................................................6
1.3 连杆的材料和毛坯 ...................................................................................6
1.4 连杆的机械加工工艺过程 .......................................................................8
1.5 连杆的机械加工工艺过程分析 ...............................................................10
1.5.1 工艺过程的安排 .............................................................................10
1.5.2 定位基准的选择 .............................................................................11
1.5.3 确定合理的夹紧方法 .....................................................................12
1.5.4 连杆两端面的加工 .........................................................................12
1.5.5 连杆大、小头孔的加工 .................................................................12
1.5.6 连杆螺栓孔的加工 .........................................................................13
1.5.7 连杆体与连杆盖的铣开工序 .........................................................13
1.5.8 大头侧面的加工 .............................................................................13
1.6 连杆加工工艺设计应考虑的问题 ...........................................................13
1.6.1 工序安排 .......................................................................................13
1.6.2 定位基准 .......................................................................................13
1.6.3 夹具使用 .......................................................................................13
1.7 切削用量的选择原则 ...............................................................................14
1.7.1 粗加工时切削用量的选择原则 .....................................................14
1.7.2 精加工时切削用量的选择原则 .....................................................15
1.8 确定各工序的加工余量、计算工序尺寸及公差 ...................................15
1.8.1 确定加工余量 .................................................................................15
1.8.2 确定工序尺寸及其公差 .................................................................16
1.9 计算工艺尺寸链 .......................................................................................17
1.9.1 连杆盖的卡瓦槽的计算 .................................................................17
1.9.2 连杆体的卡瓦槽的计算 .................................................................18
1.10 工时定额的计算 .....................................................................................19
1.10.1 铣连杆大小头平面 .......................................................................19
1.10.2 粗磨大小头平面 ...........................................................................19
1.10.3 加工小头孔 ...................................................................................20
1.10.4 铣大头两侧面 ...............................................................................21
1.10.5、扩大头孔 .....................................................................................21