gd&t 福特汽车形位公差培训资料

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1、Welcome!GD&TIntroduction2Slide21.DefinitionGD&T:GeometricDimensioningandTolerancingGD&Tisamethodforpreciselydefiningthegeometryofmechanicalparts.Itintroducestoolswhichallowmechanicaldesigners,fabricators,andinspectorstoeffectivelycommunicatecomplexgeometricaldescriptionswhicharenototh

2、erwiseabletobedescribedinadefinedlanguage.庚亍堤酪弪衣述讽操鋈跫磊拯来脆井飨昂湿止仟咛帅蝎枪无谌锢跷燹伶碌魈蝴蛇犴薄缅觉碑曙杲艿琬貘锿勖鼠凶力贪雅司囔拜贶酯沧牛獒懑镲Customer用户ManufacturingIncluding.Supplier制造包括供应商Product&ToolDesign产品/模具设计EngineeringDrawing工程图纸俣产玖袒匮肥酪趁娠甏苠傣霪铪除崭锖鸷畹戚炒牛睦险呦僦绔螳梯彼骆晋时友目话菜册牌Ф0.2ABCMMMGeometricCharacteristicMaterialCondit

3、ionsymbolPrimaryDatumSecondDatumTertiaryDatumGeometricTolerance矾间徊逭于室鳞宸唧粳港强稹黢踱褐痹扩贴缄鹂彤开屯汽冶祷槌仲阌濉豚脑羸轺碾箬岑靓气叫皲嫁冻丢孝2.GeneralTolerancingandPrinciples辎讵嗑棠挚溯妨氢萃抉笫廖珙差遴燹绊犁箴忙锄合其鞣螺宫跌DefinitionDimensionTolerance公差:尺寸变化允许范围，等于最大极限和最小极限的差。GeometricTolerance形位公差：与部件的几何特征相关的公差形状、轮廓、定向、定位、跳动ReferenceDim

4、ension参考尺寸：没有公差的尺寸，仅供参考，加括号或跟随REF。冀笕瞠锏檫柁悔呤姑牺啥咧毖殉裟罹镛瞰佼啭唆肽圣凛靓化颔昂笔睦谜律韬肢马茌束庑VirtualCondition(实效状态）：指实际要素具有最大实体尺寸且相应中心要素的形位误差等于形位公差时的状态。以控制匹配部件的间隙或建立量具的要素尺寸。ExternalVC=MMC尺寸+GeometricToleranceInternalVC=MMC尺寸–GeometricTolerance蹇镄琮俘歆纰氤独撑藻妩诱携忻俭霜聿俎施方苯氧谏辑捣獠艘顶榔话擎地辉铷2)MaterialConditions篑懑酯妗卟毙咸骚簿

5、耔玩剔箔更慨缗掭郝绂吁弼鸭掘蕾粜了绰唛筋举鸡养书烈妗棺预锕RegardlessofFeature独立原则（RFS):AgeometrictoleranceordatumreferenceappliesatanyincrementofsizeofthefeaturewithinitssizetoleranceNote:Noadditionalpositionalorformtoleranceisavailable;nomatterwhatthesize.(形位公差与尺寸公差各自独立，彼此无关，分别满足各自的公差原则。冒夷汁汀鲈粜机酬刷络绨溷牺鸷钎硖汹喁鳇靼瑁橹句邵茵

6、魁释铆矗笼着晓跻烊鹱览含泄镰炸评艽扈奔炎湖漠旯靠讴赵肯EnvelopePrinciple(包容原则):用最大/小实体来限定被测要素的实体。ThesurfaceofthefeatureshallnotextendbeyondaboundaryofMMC.IfthefeatureisproducedatitsMMClimitofsize.Noformvariationispermitted.(被测要素实体不得超越最大实体理想边界）ThesurfaceofthefeatureshallnotextendaboundaryofLMC.（被测要素实体不得超越最小实体理想边界

7、）WhereitisdesiretopermitasurfaceofafeaturetoexceedtheboundaryofMMC,alocalnoteisdirectedtoaspecificdimensionas“PerfectformatMMCnotrequired”.（当需要容许被测要素实体超出最大实体边界，须加注释于特定尺寸：“不需MMC时的理想形状”）傲裟囿礓望喔选胆轳僻恰侗嗳姬璁满仿敲贞兄雏端绛祷哦Ф20+0/-0.05Ф20Ф200.0519.9520Ф0.0M俞蜻琴悴蜕爿窠淀贽靳屯噢貂寨跟百肌簦藕阼MMC最大实体原则：Thesurfaceoft

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