北美压铸压铸件公差标准[nadcastandard,brief]

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1、WORD资料整理NADCAStandardLinearDimensions:StandardTolerancesLinearDimensions:PrecisionTolerancesPartingLine:StandardTolerancesPartingLineToleranceisthemaximumamountofdieseparationallowedfortheendproducttomeetspecifiedrequirementsofform,fitandfunction.Thisisnottobeconfusedw

2、ithPartingLineShiftTolerancewhichisthemaximumamountdiehalvesshiftfromsidetosideinrelationtooneanother.PartingLineToleranceisafunctionofthesurfaceareaofthediefromwhichmaterialcanflowfrom完美格式可编辑WORD资料整理onediehalftotheother.ThisisalsoknownasProjectedArea.ProjectedAreaisal

3、waysaplustolerancesinceacompletelycloseddiehas0separation.Excessmaterialandpressurewillforcethedietoopenalongthepartinglineplanecreatinganoversizecondition.TheexcessmaterialwillcausetheparttobethickerthantheidealspecificationandthatiswhyProjectedAreaonlyhasplustoleranc

4、e.ItisimportanttounderstandthatTableS-4A-2(ProjectedAreaTolerance)doesnotprovidePartingLineTolerancebyitself.PartthicknessordepthmustbefactoredintogiveatrueideaofPartingLineTolerance.PartingLineToleranceisafunctionofpartthicknessperpendiculartotheProjectedAreaplusthePr

5、ojectedAreaTolerance.Example:Analuminumdiecastinghas75in2(483.9cm2)ofProjectedAreaonthepartingdieplane.FromtableS-4A-2,ProjectedAreaToleranceis+0.012.ThisiscombinedwiththetotalpartthicknesstolerancefromtableS-4A-1toobtainthePartingLineTolerance.Thetotalpartthicknessinc

6、ludingbothdiehalvesis5.00in.(127mm)whichismeasuredperpendiculartothepartingdieplane(dimension“E2E1”).FromtableS-4A-1,theLinearToleranceis±0.010forthefirstinchand±0.001foreachofthefouradditionalinches.TheLinearToleranceof±0.014inchesiscombinedwiththeProjectedAreaTolera

7、nceof+0.012toyieldaStandardPartingLineToleranceof+0.026/-0.014in.orinmetricterms±0.35mmfromLinearTolerancetableS-4A-1plus+0.30mmfromProjectedAreaTolerancetableS-4A-2=+0.65/-0.35mm.PartingLineShift:StandardToleranceExample:PartingLineShiftToleranceThecavityareaatthepart

8、inglineis75inchessquared.FromTableS-4A-6,theProjectedAreaPartingLineShiftToleranceis±0.006(±0,152mm).Thisisaddedtothe