20CrMnTi齿轮渗碳淬火

常州机电职业技术学院毕业设计（论文）作者：王慧学号：20921209系部：模具技术系专业：材料成型与控制技术（热处理）题目：20CrMnTi减速机齿轮的渗碳淬火指导者：陈宁评阅者：2013年3月常州机电职业技术学院毕业设计（论文）I毕业设计（论文）中文摘要热处理工艺是金属材料工程的重要组成部分。现代工业的飞速发展对机械零部件的要求愈来愈高，因此通过热处理可以改变材料的加工艺性能，充分发挥材料的潜力，提高工件的使用寿命。为获得理想组织性能，保证零件在生产过程中的质量，稳定性和使用寿命，就必须从工件的特点、要求和技术条件，正确选择材料；再根据生产规模、现场条件、热处理设备提出几种可行的热处理方案，最后确定出一种最佳方案。20CrMnTi钢具有晶粒细、渗碳淬火性能良好、工艺性能成熟可靠且成本低廉等优点，目前生产量大致占渗碳齿轮钢的70%，齿轮在使用过程中，担负着传递动力的任务，在冲击、交变应力等作用下以齿根断裂和齿面接触疲劳为主要失效形式，因此齿轮钢应有良好的强韧性、耐磨性以承受冲击、弯曲和接触应力；此外，还要求变形小、精度高，噪声低。本设计便是对20CrMnTi减速机齿轮热处理工艺进行详细的说明，从选材下料到热处理工艺路线，以及最后的质量检验、可能产生的缺陷及预防措施等，都进行逐一分析，尽可能的将整个过程详尽的展现出来，从而对大家有所帮助。关键词：20CrMnTi；减速机齿轮；渗碳淬火；缺陷常州机电职业技术学院毕业设计（论文）II毕业设计（论文）外文摘要Title:20CrMnTiReducerGearCarburizingandQuenchingAbstract：Heattreatmenttechnologyofmetallicmaterialsisanimportantpartoftheproject.Therapiddevelopmentofmodernindustryofmachinerypartsandcomponentsoftheincreasinglyhighdemand,sotheheattreatmentcanchangethematerialandprocessperformance,givefullplaytothepotential,improvetheservicelifeoftheworkpiece.Inordertoobtaintheidealorganizationalperformance,guaranteethecomponentsintheproductionprocessquality,stabilityandservicelife,mustfromthecharacteristicsoftheworkpiece,requirementsandtechnicalconditions,properselectionofmaterials;thenaccordingtothescaleofproduction,siteconditions,heattreatmentequipmentandputsforwardseveralfeasibleheattreatmentscheme,finallydetermineakindofoptimumscheme.20CrMnTisteelhasfinegrainsize,goodperformance,carburizingandquenchingprocessismatureandreliableperformanceandlowcost,thecurrentproductioncapacityaccountedforroughly70%ofcarburizedgearsteel,gearduringuse,chargedwiththetransmissionofdynamictask,inshock,alternatingstressundertheactionoftakingrootfractureandtoothsurfacecontactfatigueasthemainthefailureformsofgearsteel,therefore,shouldhavegoodstrengthandtoughness,abrasionresistancetowithstandimpact,bendingandcontactstress;inaddition,alsocalledlittledeformation,highprecision,lownoise.常州机电职业技术学院毕业设计（论文）IIIThisisdesignedfor20CrMnTireducergearheattreatmentprocessindetail,frommaterialselectionundertheexpectedheattreatmenttechnologyroute,aswellasthefinalqualityinspection,thepossibledefectsandpreventivemeasuresandsoon,areanalyzedandexplained,asfaraspossiblethewholeprocessdetailedshowhill,thusallofyoutohelp.Keywords：20CrMnTi;Reducergear;carburizingandquenching;defect常州机电职业技术学院毕业设计（论文）IV目录毕业设计（论文）中文摘要....................................................................I毕业设计（论文）外文摘要...................................................................II目录......................................................................................................IV第一章绪论...............................................................................................11.1减速机齿轮的应用.........................................................................................11.2减速机齿轮的作用.........................................................................................41.3齿轮用钢的分类与生产.................................................................................51.4国内外汽车齿轮发展现状.............................................................................61.5减速机齿轮的性能要求.................................................................................91.6加工工艺性能要求.........................................................................................91.7材料的选择...................................................................................................10第2章热处理工艺选择........................................................................112.1预备热处理的工序位置...............................................................................112.2最终热处理的工序位置...............................................................................112.3最终热处理工艺方法选择...........................................................................11第三章热处理工艺特性对齿轮质量和寿命的影响............................123.1淬透性...........................................................................................................123.2变形开裂倾向...............................................................................................123.3淬硬性...........................................................................................................12第四章20CrMnTi钢的基本性质..........................................................134.1钢的化学成分和力学性能...........................................................................134.2含碳量及合金元素作用...............................................................................144.3汽车变速箱变速齿轮的热处理工艺设计....................................................164.3.1服役条件............................................................................................164.3.2失效形式............................................................................................16常州机电职业技术学院毕业设计（论文）V4.3.3性能要求............................................................................................17第五章20CrMnTi变速齿轮加工工艺..................................................185.1减速机齿轮常用的加工工艺路线...............................................................185.2各种工艺路线的分析.....................................................