roughness是什么意思？用法、例句(How to Measure Surface Roughness？)

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MetaDescription:Hereistheguideonmeasuringsurfaceroughness.Findoutmoredetailsaboutitandgettipsonchoosingthebestsurfacefinishingserviceprovider.

Inordertoensuretheoptimalqualityofparts,thesurfaceofcomponentsaftermanufacturingapplicationsmustbemaintainedwithinthedesiredrangeofroughness.Surfacetreatmentplaysacriticalroleintheperformanceanddurabilityofproducts.Therefore,itisessentialtounderstandtheconceptofsurfaceroughnessandhowtomeasureit.

Surfaceroughnessreferstoameasureofthetextureofasurface.Itisquantifiedbytheverticaldeviationsofarealsurfacefromitsidealform.Thesurfaceisroughifthesevariationsaregreat;smoothiftheyareminimal.Roughnessiscommonlythoughtofasahigh-frequency,short-wavelengthcomponentofameasuredsurface.Inpractice,knowingboththeamplitudeandfrequencyisfrequentlyrequiredtoconfirmthatasurfaceissuitedforthepurpose.

Whenyouconfuseaboutsurfaceroughnesssymbols,youcouldsearchthemonBroeserandfindarangeofsymbols,includingRa,Rz,andmore.Herearesomeclarificationsforthesymbolofsurfaceroughness:

Raisausefulaverage,butitdoesnotdistinguishbetweenpeaksandvalleys.ThesameRavaluemightbeassignedtoquitediverseprofiles.Theupperlimitormaximumvalueofaparameterinatechnicalspecificationisfrequentlydiscoveredduringinspection.

Rz,asopposedtoRa,takestheaverageofthefivelargestdisparitiesbetweenpeaksandtroughs.Themeasurementisperformedwithfivesamplinglengths,whichhelpstoeliminatemistakebecauseRaissomewhatinsensitivetosomeextremes.

Rq(andoccasionallyRMS)isanotherfactorforthedescriptionofmeasuringsurfaceroughnessfortheroot-mean-squaredeviationofaprofile.

Surfaceroughnessisameasureofthesmoothnessofasurface'sprofile.Raisanumericalparameter.ThearithmeticaverageofsurfaceheightsmeasuredacrossasurfaceisshownontheRasurfacefinishchart.

Roughness,waviness,andlayarethethreemaincomponentsofasurface,aspreviouslystated.Asaresult,severalfactorsinfluencethesurfacegeometryproperties.Likewise,thereareseveralmethodsforsurfaceroughnessmeasurement.Themethodscontain:

1.ComparisonMethod

Themeasuredsurfaceandthesurfaceroughnesstemplatearedirectlycompared,andtheworkpiecewithalargersurfaceroughnessvalueisused.

2.SurfaceRoughnessforInspectionUsingStylusInstruments

Surfaceroughnesshasmostcommonlymeasuredbyaninstrumentwhereastylusisusedtomoveacrossasurface,themovementofthestylusisamplified,andthesignalisrecordedtodeterminehowroughthesurfaceis.Thearithmeticaveragevalueofthedeviationofthetraceaboveandbelowthecenterlineistheoutcome,whichistypicallywrittenasRaoraverageroughness.

3.OpticalCuttingMethod

Opticalcuttingmethodsemploylightorsoundinsteadofcontact.Thestylusisreplacedwithopticalinstrumentssuchaswhitelightandconfocal.Differentmeasurementprinciplesareusedbythisequipment.Afterthat,thephysicalprobescanbereplacedwithopticalsensorsormicroscopes.Theinstrumentwillfirstsendanultrasonicpulsetothesurface.Thesoundwaveswillthenbealteredandreflectedbacktothedevice.Thereflectedwavescanthenbeevaluatedtoderiveroughnessparameters.

4.PrintingMethod

Theprintingmethodcanbeusedforlargepartsortheinnersurfaceofpartsthatarenoteasytomeasuredirectly.Thepeak-valleyvalueoftheimpressionsurfaceisalwayssmallerthanthatofthemeasuredsurface,sothisresultneedstobecorrected.

Fromtheabove,weknow4methodstomeasuresurfaceroughness,andhowtoevaluatesurfaceroughnesswhenwehaveobtainedtheparameters.

Fordescribingsurfaceflaws,surfacetextureparametersareuseless.

Therefore,wheninspectingthesurfacetexture,surfaceflawslikeporesandscratchesarenottobetakenintoaccount.Acollectionofsinglevaluesofthesurfacetextureparameter,eachdeterminedfromanevaluationlength,shallbeutilizedtodeterminewhetherornotaworkpiece'ssurfacecomplieswiththespecification.Thenumberofsamplinglengthswithintheevaluationlengthswithwhichthesinglevalueofthesurfacetextureparameterisobtainedaswellasthenumberofevaluationlengths,orthenumberofmeasurementsalongthesurface,determinehowaccuratelythedecisionismadeastowhetherornotthesurfacebeinginspectedmeetsthespecificationandtheprecisionofthemeanvalueobtainedforthesurfacetextureparameterofthesamesurface.

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