三次元教程形位公差

相邻峰与峰或谷与谷之间的距离，单位Unintendedsurfaceimperfectionswhichoccurduringmanufacturingsuchascracks,blowholes,rivets,scratches,gouges,nicks,cuts,punctures,dimples,chemicalcorrosion,etc.ThepredominantdirectionofthetoolmarksofthesurfaceOnemillionthofameter,(.000005TherelativelyfinelyspacedsurfaceirregularitiesthatareproducedbythecuttingactionoftoolRoughnessAvalueinmicrometersforthe(arithmetical)averageheightbetweenthepeaksandvalleysofthesurfaceroughnessofatypical“roughnesswidthcutoff”length.RoughnessThedistanc weensuccessiveareasofridgeswhichconstitutethepredominantpatternofroughness.Roughnesswidthismeasuredinmillimeters.RoughnessWidthCutoffThelengthofthesurfacemeasuredforaroughnessheightcheck.Roughnesswidthcutoffratingisusuallymeasuredinmillimeters.SurfaceTherepetitiveofrandomdeviationsfromthenominalsurface,whichformthepatternofthe ludedareRoughness,Waviness,LayandFlaws.Thesurfaceundulationsthatareofmuchgreatermagnitudethanroughnessirregularities.Wavinessmayresultformmachineofpartdeflections.WavinessThepeaktovalleydistanceofthewaves.ItismeasuredinThespacingofsuccessivewavevalleysorwavepeaks.Wavinesswidthismeasuredin

BASICSYMBOLAREMACHININGISSurfacePerferredroughness(averagevalues Microhes— 只指定一个数值表示为最指定粗糙度高度参数最大最大峰数标在水平延最大微观宽度参数标在水平延伸线上方，最大峰

取样长度标在水平延伸线的下面。如果未标出，默认为需要时，微观不平度间距标在纹理符号的右边，小于此

SurfaceTextureSymbols attheleftofthelongleg.specificationofonly ratingshallindicate valueandanylesservalueshall Thespecification valueandminimum permissiblerangeofvalue b iscedabovetheextension.Anylesserrating be tumwavinesswidthrating cedabovethe extensionandtotherightof ratingshallbeacceptable.ofbearingareawithamatingpartorreferencesurfaceshallbeindicatedbyapercentagevaluecedabovetheextensionlineasshown.FurtherrequirementsLaydesignationisindicatedbythelaysymbolcedattherightofthelongleg.Roughness-widthcutoffratingiscedbelowthehorizontalWhennovalueisshown,0.80isassumed.Whererequired,umroughnessWidthratingshallbecedattherightofthelaysymbol.Anylesserratingshallbeacceptable.Materialremovalbymachiningisrequiredtoproducethesurface.Thebasic