18-MFG-Powder.pdf

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1、11.09.2015POWDERMETALLURGYME2201.TheCharacterizationofEngineeringPowdersDesignandManufacturing2.ProductionofMetallicPowders3.ConventionalPressingandSintering4.AlternativePressingandSinteringTechniques18.PowderMetallurgy5.MaterialsandProductsforPM6.DesignConsiderationsinPowderMetallurgyMehmetDEMİRKOL

2、ME220DesignandManufacturingME220DesignandManufacturingPowderMetallurgy(PM)WhyPowderMetallurgyisImportantMetalprocessingtechnologyinwhichpartsarePMpartscanbemassproducedtonetshapeproducedfrommetallicpowdersornearnetshape,eliminatingorreducingtheUsualPMproductionsequence:needforsubsequentmachining1.

3、Pressing-powdersarecompressedintoPMprocesswastesverylittlematerial-~97%desiredshapetoproducegreencompactofstartingpowdersareconvertedtoproductAccomplishedinpressusingpunch-PMpartscanbemadewithaspecifiedlevelofand-dietoolingdesignedforthepartporosity,toproduceporousmetalparts2.Sintering–greencompa

4、ctsareheatedtoExamples:filters,oilimpregnatedbearingsbondtheparticlesintoahard,rigidmassandgearsPerformedattemperaturesbelowthemeltingpointofthemetalME220DesignandManufacturingME220DesignandManufacturingMoreReasonsWhyPMisImportantLimitationsandDisadvantagesHightoolingandequipmentcostsCertainmeta

5、lsthataredifficulttofabricatebyothermethods(i.e.I/M)canbeshapedbyMetallicpowdersareexpensivepowdermetallurgyProblemsinstoringandhandlingmetalTungstenfilamentsforincandescentlamppowdersbulbsaremadebyPM,WCcuttingtools,Degradationovertime,firehazardswithCertainalloycombinationsandcermetsmadecertai

6、nmetalsbyPMcannotbeproducedinotherwaysLimitationsonpartgeometrybecausemetalPMcomparesfavorablytomostcastingpowdersdonotreadilyflowlaterallyinthedieprocessesindimensionalcontrolduringpressingPMproductionmethodscanbeautomatedforVariationsindensitythroughoutpartmaybeeconomicalproductionaproblem,esp

7、eciallyforcomplexgeometriesME220DesignandManufacturingME220DesignandManufacturing111.09.2015PMWorkMaterialsPMPartsLargesttonnageofmetalsarealloysofiron,steel,andaluminumOtherPMmetalsincludecopper,ni