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三乙胺法冷芯盒制芯工艺影响因素的研究.pdf

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华中科技大学硕士学位论文 Abstract Tri-ethylamineColdBoxCore-makingProcess,withthefeaturesofmoreefficiency, energysaving,goodcastingsurfacequality,accuratedimension,goodcorecollapsibility, hasbeenwidelyusedinautomobiles,internalcombustionengines,tractor,engineering machinery,rollingstock,brakepump.However,thehighusageamountofresin,low performanceandbadstorageofsandcoreleadtothehighscraprateinproductionprocess ofsomeFoundryEnterprise.Therefore,furtherstudiesontheseproblemscanprovide technicalsupportforoptimizationofTri-ethylamineColdBoxCore-makingProcess, enhancingsandcoreperformanceandreducingproductioncost,whichhaveimportant realisticsignificance. Inthispaper,combiningtheproductionpracticeofNo.1FoundryPlant,Dongfeng motorCo.,Ltd(hereinaftercalled:No.1FoundryPlant),reasonsforthehighusage amountofresinandlowefficiencyofcore-makingwereanalyzed.Furthermore,effectsof processconditionsforsandcoreperformanceofTri-ethylamineColdBoxbasedonactual productionwerestudied.Finally,severalimprovementmeasuresofISOCUREofNo.1 FoundryPlantwereproposed,andtheresultsachievedareasfollows. ThroughanalyzingqualityofrawmaterialsandproductionprocessofTri-ethylamine ColdBoxCore-makingofNo.1FoundryPlant,highwatercontentoftherawsandandthe compressedairisidentifiedasthemainreasonforhighusageamountofresin. Theeffectoftheamountofaddedresinonsandcoreperformancewasstudied.The resultsshowedthattheinitialstrengthandthe24hfinalstrengthofsandcoreincreased withtheincreaseofamountofadditionofresin,thegasevolutionindicatethesame variationtendency.Whentheamountofaddedresinis1.8%,he24hfinalstrengthreach themaximumattheratiooftwocomponentsis50:50,andtheinitialstrengthreachesits maximumattheratioof55:45.Itisalsocanbeseenthatthetensilestrengthofsandcore hasgoodstabilitywhentheratioisbetween50:50and55:45. Andthen,researchofwater-basedpaint,environmentalhumidityandtemperatureon strengthandfractureofsandcorewerealsoexplored.Theresultsshowedthatthe water-basedpaintmadethe24hfinalstrengthdecreasesignificantly,butthedeclinerate