连杆加工工艺及其镗大头孔夹具设计说明书

I摘要连杆加工是机械制造工艺中的一种典型零件加工，本文主要论述了连杆的加工工艺及其镗大头孔夹具设计，目的是希望能在降低产品的生产成本的同时又可以制造出品质优良的产品，在最少的工序或加工时间中制造出满足形状、尺寸、精度及表面粗糙度等要求的产品。因此在安排连杆加工工艺的路线时，就需要将各主要表面的粗精加工工序分开，逐渐减少加工余量，最终达到加工要求。夹具是制造系统的重要组成部分，在这次设计中会涉及到通用夹具、专用夹具等夹具，而本文将详细的论述镗大头孔的专用夹具的设计，主要论述镗大头孔的定位、切削力和夹紧力的计算、夹紧装置的设计、夹具体的设计。本次设计采用连杆盖和连杆体分离锻造，并采用合理的工艺路线，而夹具设计采用一面两销的定位方案，螺旋压板夹紧机构，最终达到要求。关键词：连杆；加工工艺；夹具设计ABSTRACTTheconnectingrodprocessingisatypicalkindofpartsprocessinginmanufacturingtechnology.Themainpointofthethesisisabouttheprocessingtechniquesofconnectingrodanditsjigdesign,whichaimsatmanufacturinggoodproductsandreducingtheproductioncost,andalltheproductscanbemanufacturedtomatchtherightshape,size,accuracy,andsurfaceroughnesswiththeleastproceduresandtime.Thereforeinordertoreachtheprocessrequirement,themainsurfaceroughnessprocessneedstobeseparated,andthenthefinishingallowancecanbereducedgradually.Fixtureisanimportantpartofmanufacturingsystem.ThisdesigninvolvesUniversalfixture,Specialfixture,andsoon.Meanwhilethethesiswilldiscussaboutthespecialfixturedesignofboringheadwholeindetails,suchaspositioning,thecalculationofcuttingforceandclampingforce,thedesignofclampingdevice,andthedesignoffixture.Thisdesignadoptsseparationforgingconnectingrodcoverandbody,andusingreasonabletechnologyroute,thefixturedesignadoptsatwopinpositioningscheme,powdertightlyonthescrewmechanism,finallyachieved.Keywords:connectingrod;processingtechnology;fixturedesignIII目录摘要................................................................................................................................................................IABSTRACT................................................................................................................................................II第一章绪论...............................................................................................................................................11.1连杆的特点......................................................................................................................................11.1.1连杆的组成............................................................................................................................11.1.2连杆的作用............................................................................................................................11.1.3主要损坏形式........................................................................................................................11.2连杆的材料和发展趋势...................................................................................................................21.2.1传统材料................................................................................................................................21.2.2新型材料................................................................................................................................31.2.3空压机连杆材料展望...........................................................................................................5第二章连杆的加工工艺........................................................................................................................62.1连杆的结构工艺性分析..................................................................................................................62.1.1连杆结构...............................................................................................................................62.1.2连杆的材料...........................................................................................................................62.1.3连杆的工艺分析...................................................................................................................62.2毛坯的选择.....................................................................................................................................62.2.1确定毛坯的种类...................................................................................................................72.2.2确定毛坯的形状...................................................................................................................72.3机械加工工艺路线的制定..............................................................................................................82.3.1定位基准的选择...................................................................................................................82.3.2制定工艺路线.......................................................................................................................82.4工序设计.......................................................................................................................................122.4.1机床的选择.........................................................................................................................122.4.2工艺装备的选择.................................................................................................................122.4.3量具的选择.........................................................................................................................142.5确定机械加工余量、工序尺寸及毛坯尺寸..............................................................