DMY00007ENmoss8006.docx

DMY00007ENmoss8006.docx

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DMY00007ENmoss8006

InjectionMouldedPlasticParts-MOSS800/6

GlobalDirective-MechanicalProcess

Contents:

1.PURPOSE

2.DEFINITION

3.INSPECTIONOBJECTS

Suck

Dentorbump

Convexityorconcavity

Bent

Twist

Bursts

Incompletecompression

Jointseam/coldseam

Feed-inmarks

Flowingmarks

Hardness/stiffness

Brittleness

Burningmarks

”Silverline”

Scratches

Sidescratches

Shineerrors

Bubbles/splinters

Colourerror

Matcherror

Impurities

Remainsoflooseningmaterial

Refractionerror

Uniformityofouterappearance

Wearingofelectroerodedsurfaces

4.CAPTIONS

Thecaptionsmustcontain:

Captionexample

InjectionMouldedPlasticParts-MOSS800/6

1.PURPOSE

Thepurposeofthisstandardisto

.Describethequalityrequirementsindifferentqualityclasses.Italsocomprisessomeofthemostcommondefectswiththeircausessothattheycanbepreventedindesignandproductionphases.

.Makethecaptionsuniform.

Note1.QualityclassificationofsurfacesisdefinedinMOSS800/1.

2.DEFINITION

3.INSPECTIONOBJECTS

.Suck

.Dentorbump

.Convex/concave

.Bent

.Twist

.Bursts

.Incompletecompression

.Jointseam/coldseam

.Feed-inmarks

.Flowingmarks

.Hardness/stiffness

.Brittleness

.Burningmarks

.”Silverline”

.Scratches

.Sidescratches

.Shineerrors

.Bumps/splinters

.Colourerrors

.Matcherror

.Impurity

.Remainsoflooseningmaterials

.Refractionerror

.Uniformityofoutersurfaces

.Wearingofelectroerodedsurfaces

Suck

Definition

Amoderatedentincoatingwithapossibleshinyarea.Itiscaused.bynon-simultaneouscoolingofpartswithdifferentthicknessesortooquickacooling.

Inspectioniscarriedoutvisually.

Requirements:

ClassI:

Nodefectsallowed

ClassII:

Moderatedefectsareallowediftheyarenoticeablethroughreflectiononly

ClassIII:

Defectscanbeallowediftheydonotdisturbassemblyoruse

Dentorbump

Definition

Agentle-edgeddeviationfromunbrokensurfacelevel.Itiscaused.bywronghandlinginproductionprocess..abumpcausedbyatoolwhenpressingthepartout.

Inspectioniscarriedoutvisually.

Requirements:

ClassI:

Nodefectsallowed

ClassII:

Moderatedefectsareallowediftheyarenoticeablethroughreflectiononly

ClassIII:

Dentsorbumpscanbeallowediftheydonotdisturbassemblyoruse

Convexityorconcavity

Definition

Thesurfaceiscompletelyconvexorconcave（dentorbump）.Thisiscaused.byworkmethodormalfunctionoftool.

Inspectioniscarriedoutvisuallyorbymeasuring.

Requirements:

ClassI:

Nodefectsallowed

ClassII:

Minordefectsareallowed.Thetolerancesmustberespected

ClassIII:

Canbeallowedifitdoesnotdisturbassemblyoruse

Bent

Definition

Thewholepartisbent.Thisiscaused.bywronghandlingincoolingphase.

Inspectioniscarriedoutvisuallyorbymeasuring.

Requirements:

ClassesIandII:

NodefectsallowedThetolerancesmustberespected

ClassIII:

Canbeallowedifitdoesnotdisturbassemblyoruse

Twist

Definition

Partoftheobjectistwisted.Thisiscaused.bywronghandlingincoolingphase.

Inspectioniscarriedoutvisuallyorbymeasuring.

Requirements:

ClassesIandII:

Nodefectsallowed.Thetolerancesmustberespected

ClassIII:

Gentledefectsallowediftheyarenoticeablethroughreflectiononlyandtheydonotdisturbassemblyoruse

Bursts

Definition

Anextraburstofmaterialnotbelongingtothepart.Thisiscaused.byafaultytoolortheoverpressureusedincompression.

Inspectioniscarriedoutvisuallyorbymeasuring.

Requirements:

ClassesIandII:

Nodefectsallowed

ClassIII:

Gentleburstsallowediftheydonotdisturbassemblyoruseandtheydonotgetlooseinassemblyoruse

Incompletecompression

Definition

Theparthasnocompleteform.Thisiscaused.byinsufficientremovalofgases.

Inspectioniscarriedoutvisually.

Requirements:

ClassesIandII:

Nodefectsallowed

ClassIII:

GentledefectsareallowediftheydonotdisturbassemblyoruseDefinitionismadebyreferencemodelsorinstructionsforincominginspection

Jointseam/coldseam

Definition

Aline-likecolourerror.Thisiscaused.byjointofcoldmaterialflows.

Inspectioniscarriedoutvisually.

Requirements:

ClassI:

Nodefectsallowed

ClassIIandIII:

MinordefectsallowedifdurabilityisnotdecreasedThedurabilityhastobeprovedbytests

Feed-inmarks

Definition

Colourtonedifferencesrightbythefeedinpoint.Itiscaused.bywrongcompressionprocess.

Inspectioniscarriedoutvisually.

Requirements:

ClassI:

Nodefectsallowed.

ClassII:

Minordefectsallowed.

ClassIII:

Defectscanbeallowediftheydonotdisturbassemblyoruse.

Flowingmarks

Definition

Colourtonedifferencesinthesurface.Thisiscaused.bywrongcompressionprocess.

Inspectioniscarriedoutvisually.

Requirements:

ClassI:

Nodefectsallowed.

ClassII:

Minordefectsallowed.

ClassIII:

Defectscanbeallowediftheydonotdisturbassemblyoruse.

Hardness/stiffness

Definition

Deviationfromthedefinedrawmaterialvalues.Thisiscaused.bywrongrawmaterialorthemixtureratio.

Inspectioniscarriedoutvisually.

Requirements:

ClassesI,IIandIII:

Nodeviationallowed.

Note!

Captionofhardnessismarkedifneeded（especiallyincaseofsoftmaterials）.

Brittleness

Definition

Deviationfrombreakingdurabilitydifferingfromthosedefinedfortherawmaterial.

Inspectioniscarriedoutbytesting.

Requirements:

ClassesI,IIandIII:

Nodeviationallowed.

Burningmarks

Definition

Sensitivitytoscratches.Thisshowsintonedifferences.Indifficultcasesthereareformdefects.Thisiscaused.byoverheatingofthematerialorbyold/recycledrawmaterial.

Inspectioniscarriedoutvisuallyorbyfeeling.

Requirements:

ClassesIandII:

Nodefectsallowed.

ClassIII:

Minordefectsallowediftheydonotdecreasethedurability.Thedurabilitymustbeprovedbytests.

”Silverline”

Definition

Colourtonestripesordotsinthesurface.Thisiscaused.byevaporationofhumidityintherawmaterialorburntrawmaterial.

Inspectioniscarriedoutvisually.

Requirements:

Minordefectsareallowedifthedurabilityofthepartisnotdecreased.Thismustbeprovedbytests.

Scratches

Definition

Defectedsurface.Thisiscaused.bywronghandling.

Inspectioniscarriedoutvisually.

Requirements:

ClassI:

Nodefectsallowed.

ClassII:

Minorscratch,whichisdefinedbyareferencemodel,canbeallowed.

ClassIII:

Canbeallowed.

Sidescratches

Requirements:

ClassIandII:

Minordefect,whichisdefinedbyareferencemodel,canbeallowed.

ClassIII:

Canbeallowed.

Shineerrors

Definition

Deviationsappearingasshinyareasfromthedefinedroughnessofthesurface.Thisiscaused.bytemperaturedifferencesinmould.

Inspection:

Thisiscarriedoutbymeansofareferencemodeland/ordefinedmeasurementvalue.

Requirements:

Definitionisperformedbyreferencemodels,classesI,IIandIII.

Bubbles/splinters

Definition

Poresinsidetherawmaterial.Appearasdistortionintransparentparts.Thisiscaused.byevaporationofimpuritiesinrawmaterial.

Inspectioniscarriedoutvisually.

Requirements:

ClassI:

Nodefectsallowed.

ClassIIandIII:

Bubbles/splintersareallowediftheydonotaffectouterappearanceordurability.

Colourerror

Definition

Deviationfromdefinedcolourvalue.Atitsworst,thisiscausedbyuseofmixingmethod.

Colour,colourtoneandpattern

Theseareinspectedbymeansofapprovedreferencemodeland/oradefinedmeasurementvalue.

Requirements:

ClassesIandII:

Nonoticeabledefectsallowedeitherwhencheckedvisuallyorwhenmeasured.Especiallythepartstobejoinedmustmatchcolourwise.

ClassIII:

Nodisturbingdeviationsincolourallowed.

Matcherror

Definition

Partstobejoineddonotmatchtogether.Thisiscaused.bymoulddefectorwrongcooling.

Requirements:

ClassesI,IIandIII:

Noerrorsallowed.Requirementlevelsaredefinedbymeansofreferencemodels.

Impurities

Definition

Impuritiescausedbyhandling,suchasdust,greaseandfingerprintsetc.

Inspectioniscarriedoutvisually.

Requirements:

ClassesIandII:

Nodefectsallowed.

ClassIII:

Impuritiesallowediftheydonotdisturbassembly,useorfinishingtouch.printing）.

Remainsoflooseningmaterial

Definition

Remainsoflooseningmaterialappearasshinedifferencesorpatches.

Inspectioncarriedoutvisually.

Requirements:

ClassIandII:

Nodefectsallowed.

ClassIII:

Nosiliconbasedmaterialsallowed.

Refractionerror

Definition

Adistortionorshinecausedbydistortionorrefractionintransparentpart.Thisiscaused.bymoulddefects.

Inspectioniscarriedoutvisually.

Requirements:

ClassesI,IIandIII:

Definitionbyreferencemodels.

Uniformityofouterappearance

Definition

Deviationsfromtheuniformityofdifferentpartsinthesameentity.Thisiscausedby:

-toolingsteel

-qualityofelectrode

-arcmachiningapparatus

-sensitivityofstainsfromthemouldinrawmaterial

-injectionmouldingmachine

Inspectioniscarriedoutvisually.

Requirements:

ClassI:

Deviationfromuniformityofouterappearanceisnotallowed.

ClassIIandIII

Agreeddeviationsallowed.

Wearingofelectroerodedsurfaces

Definition

Similardefectsasinitemsandcanbefound.Defectscanbecaused.bywronglychosenmouldrawmaterialorplasticrawmaterial.

Inspectioniscarriedoutvisually.

Requirements:

ClassI:

Nodefectsallowed.

ClassII:

Agreeddefectsallowed.

ClassIII:

Defectsallowediftheydonotdisturbassemblyoruse.