拖拉机变速箱体双面钻孔组合机床总体及夹具设计

拖拉机变速箱体双面钻孔组合机床总体及夹具设计摘要：组合机床是由大量通用部件和少量的专用部件组成的专用机床。为了提高产品生产效率，满足被加工零件的精度要求，本课题设计了一台用于加工JM300拖拉机变速箱体两侧面钻孔的组合机床。本组合机床可以同时加工JM300拖拉机变速箱体左面上的18个M10的螺纹底孔、8个M8的螺纹底孔、2个∅20的光孔、1个∅12的光孔以及右面上的18个M10的螺纹底孔、6个M8的螺纹底孔、1个∅12的光孔和1个M16的螺纹底孔。本课题主要阐述组合机床的总体设计和夹具设计。在满足工艺要求的基础上，绘制了“三图一卡”，确定了该组合机床的整体布置方案。在夹具设计过程中，采用方便可靠的一面两孔的定位，以工件的底面作为主定位面限制3个自由度，由一个圆柱定位销限制2个自由度，由一个削边定位销限制剩下的一个自由度，从而限制了被加工零件的6个自由度。该组合机床夹具选用安全方便的手动夹紧方式，设计了夹具的总体结构和主要零件，对夹具进行了误差分析，夹紧力的计算。该组合机床不仅保证了钻孔精度，还提高了加工效率，降低了工人的劳动强度，较好地完成了设计任务。关键词：组合机床；钻孔；夹具设计本设计来自：完美毕业设计网：8191040DesignofGeneralandJigofModularMachineToolforDrillingHolesonTwo-SideofTractorGearboxAbstract:Modularmachinetoolisaspecial–purposemachinetoolconsistedthatiswithalargenumberofgeneral-purposecomponentsandasmallnumberofspecial-purposecomponents.Inordertoimproveproductionefficiencyandsatisfytheprecisionoftheprocessedparts,thesubjectaimsatdesigningamodularmachinetoolusedfordrillingholes,whichareonbothsideoftractorgearboxofJM300.Themodularmachinetoolcanprocess18basicholesofM10screw,8basicholesofM8screw,twodiaphragmswhichthediameteristwentyandadiaphragmwhichthediameteris12ontheleftsideoftractorgearboxofJM300,and18basicholesofM10screw,6basicholesofM8screw,adiaphragmwhichthediameteris12andonebasicholesofM16screwontherightside.Thedesignmainlyillustratesthegeneraldesignofthemodularmachinetoolandthejigdesign.Onthebasisofmeetingthetechnicalrequirements,thecompletionofthetechnologicaldrawingofthepartwhichneedtobemanufactured,thegeneraldrawingofmodularmachinetool，drawingofcutterdisplayandtheefficiencycardofmanufacture,anddeterminesthegenerallayoutprogramofthemodularmachinetool.Intheprocessofdesigningthejig,usetheconvenientandreliablepositioningofthetwoholesonthesamesideareused,andthebottomoftheworkpieceispositionedasamajorsidewhichrestrictsthethreedegreesoffreedom,acylindricalpinrestrictstwodegreesofthefreedom,acuttingedgepinrestrictstheleftdegreesofthefreedomsothatitrestrictssixdegreesofthefreedomoftheworkpiece.Thejigofthemodularmachinetoolusesthesafeandconvenientmanualclamping,designsthegeneralstructureandmajorpartsofjig,carriesontheerroranalysisandcalculationsofclampingforce.Themodularmachinetoolcannotonlyguaranteetheaccuracyofdrillingtheholes,butalsoenhancetheprocessingefficiencyandreducethelaborintensity.Keyword:Modularmachinetool;Drilltheholes;Designofjig目录1前言............................................................................................................................42组合机床总体设计....................................................................................................52.1总体方案论证.........................................................................................................52.1.1加工对象工艺性的分析..............................................................................................52.1.2机床配置型式的选择..................................................................................................72.1.3定位基准的选择...........................................................................................................82.2确定切削用量及选择刀具.....................................................................................82.2.1选择切削用量...............................................................................................................82.2.2计算切削力、切削扭矩及切削功率........................................错误!未定义书签。2.2.3选择刀具结构...............................................................................错误!未定义书签。2.3组合机床总体设计—三图一卡.............................................错误!未定义书签。2.3.1被加工零件工序图.......................................................................错误!未定义书签。2.3.2加工示意图....................................................................................错误!未定义书签。2.3.3机床联系尺寸图...........................................................................错误!未定义书签。2.3.4机床生产率计算卡.....................................................................错误!未定义书签。3组合机床夹具设计..................................................................错误!未定义书签。3.1概述.........................................................................................错误!未定义书签。3.1.1零件的工艺性分析.......................................................................错误!未定义书签。3.1.2夹具设计的基本要求..................................................................错误!未定义书签。3.1.3夹具总体结构构思.......................................................................错误!未定义书签。3.2定位方案的确定.....................................................................错误!未定义书签。3.2.1定位方案论证...............................................................................错误!未定义书签。3.2.2定位基准的选择...........................................................................错误!未定义书签。3.2.3定位的实现方法...........................................................................错误!未定义书签。3.3误差分析.................................................................................错误!未定义书签。3.3.1影响加工精度的因素..................................................................错误!未定义书签。3.3.2保证加工精度的条件..................................................................错误