齿轮箱工艺设计及加工过程仿真（数控编程设）计说明书毕业论文.doc

内蒙古科技大学本科生毕业设计说明书1目录摘要..........................................................................................................................................ⅠAbstract............................................................................................................................Ⅱ目录.................................................................................................................................Ⅰ第一章绪论...................................................................................................................11．1箱体零件的主要技术要求.....................................................................................11．1．1箱体类零件的结构特点............................................................................11．1．2箱体类零件的结构特点............................................................................21．1．3箱体类零件的材料和毛坯........................................................................21．2箱体类零件的加工工艺分析....................................................................................21．2．1工艺路线的安排...........................................................................................21．2．2定位基准的选择........................................................................................31．2．3主要表面的加工........................................................................................41.2.3.1箱体的平面加工...........................................................................................41.2.3.2孔系加工.....................................................................................................41．3夹具的组成.............................................................................................................51．4钻模的分类与设计.................................................................................................6第二章零件的功用与结构分析.................................................................................82.1零件的功用................................................................................................................82.2零件的工艺分析........................................................................................................82．2．1零件主要加工表面尺寸.............................................................................102．2．2零件的材质。热处理及工艺分析.............................................................10第三章工艺规程设计...................................................................................................113．1确定毛坯的制造形式.............................................................................................113．2基面的选择..............................................................................................................113．2．1精基准的选择............................................................................................113．2．2粗基准的选择............................................................................................113．2．3定位夹紧方案的制定................................................................................113．3工艺过程的划分......................................................................................................123．4工艺路程的制定......................................................................................................123．5工艺方案的分析与比较.....................................................................................143．5．1工艺规程选择的基本因素....................................................................143．5．2工艺规程的基本分析............................................................................15第四章确定切削用量及工序设计...........................................................................174．1机械加工余量，工序尺寸及毛坯尺寸的确定.....................................................174．2确定切削用量及工序计算.....................................................................................184．2．1工序10精铣N面...................................................................................184．2．2工序20粗扩铰2Ф9，钻4Ф13.........................................................19内蒙古科技大学本科生毕业设计说明书24．2．3工序30精铣R面及Q面.....................................................................214．2．4工序40铣凸台面..................................................................................224．2．5工序50粗镗2Ф80mm孔并倒角.......................................................224．2．6工序60精铣N面...............................................................................234．2．7工序70精扩铰2Ф10mm孔...............................................................234．2．8工序80精铣R及Q面....................................................................284．2．9工序90精镗2Ф80H7孔.....................................................................254．2．10工序100凸台面各孔钻、攻螺纹........................................................264．2．11工序110刮422平面........................................................................284．2．12工序120钻铰R、Q面各孔...............................................................294．2．13工序130攻螺纹8M126H...............................................................35第五章夹具设计.............................................................................................................385.1夹具设计的概述...................................................................................................385．2确定工件的定位方案..............................................................................................365．3定位误差的分析......................................................................................................375．4计算夹紧里并确定螺杆直径..................................................................................38结束语......................................................................................................................................41参考文献..................................................................................................................................42致谢..........................................................................................................................................43齿轮箱工艺设计及加工过程仿真（数控编程）摘要犁刀变速齿轮箱体是旋耕机的一个主要零件。旋耕机通过该零件的安装平面与手扶拖拉机变速箱的后部相连，用两圆柱销定位，四个螺栓固定，实现旋耕机的正确联接。犁刀变速齿轮箱体的质量直接影响到机器的性能。本次设计先进行了犁刀变速齿轮箱体的零件分析，通过对参考文献进行的分析与研究，阐述了工艺规程和制造技术等相关内容在技术路线中，论述箱体的加工工艺，机械加工余量，加工顺序的安排和基本工时计算。关键词工艺规程犁刀变速齿轮箱体定位基准加工余量内蒙古科技大学本科生毕业设计说明书3AbstractThecoultergearcasingofchangingspeedisamajorelementofthemachineofrotarytillage.Themachineofrotarytillageislinkedthroughtherearofthegearboxofwalkingtractorandtheinstallationplaneofthiselement,usingtwocylinderstoselllocationand4boltstofixinordertorealizethecorrectcouplingofthemachineofrotarytillage.Thequalityofthecoultergearcasingofchangingspeedputadirectinfluenceontheperformanceofmachine.Thisdesigngoesontheelementanalysisofthecoultergearcasingofchangingspeedfirst,throughtheresearchandanalysisofthebibliographicalreference,thenithaveelaboratedprocedureandmadetherelatedcontentssuchastechnologyIntechnicalroute,itdiscussedmachiningsurplusandtheprocessingtechnologyofcasing,theprocessofthesequentialarrangementandthecalculationofthebasicmanhour.KeywordsProcedurethecoultergearcasingofchangingspeedlocationstandardmentalallowance内蒙古科技大学本科生毕业设计说明书4第一章绪论箱体类零件是机器及其部件的基础件，它将机器及其部件中的轴、轴承、套和齿轮等零件按一定的相互关系装配成一个整体，并按一定的传动关系协调其运动。因此，箱体加工质量的好与坏不仅影响这个装配精度及运动关系，而且还影响到机械的工作精度、使用性能和寿命。箱体零件的结构特点多为铸造件，结构复杂，壁薄且不均匀，加工部位多，加工难得大。1．1箱体零件的主要技术要求轴颈支承孔孔径精度以及相互之间关系的位置精度，定位销孔的精度与孔距精度主要平面的精度，表面粗糙度等。箱体零件材料及毛坯箱体零件唱选用灰铸铁，汽车、摩托车的曲轴箱选用铝合金作为曲轴箱的主要材料，其毛坯一般采用铸件，因而轴箱是大批大量的生产，且毛坯的形状复杂，所以采用压铸毛坯，镶套与箱体在压铸时铸成一体。压铸的毛坯精度高，加工余量小，有利于机械加工。为减少毛坯铸造时的产生的残余应力，箱体铸造后应安排人工时效。1．1．1箱体类零件的结构特点箱体的种类很多，其尺寸大小和结构形式随着机器的结构和箱体在机器中的功用的不同有着较大的差异，但从工艺上分析它们仍然有着许多共同之处，其结构特点是1）外形上基本是由六个或者五个平面组成的闭封式多面体，又分成整体式和组合式两种2结构形状比较复杂。内部常为空腔，某些部位有着隔墙，箱体壁薄且厚薄不均匀。