Using paint on sand molds and sand cores, these four methods have their own advantages and disadvantages.
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- Time of issue:2021-08-27
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(Summary description)Foundriescanusefourmethodstoapplycoatingsonsandmoldsandcores,eachofwhichhasadvantagesanddisadvantages. Brushing:Brushingpaintonthesandmoldcanprovidegood,controllablecoverage.Thismethodcanbeeasilyappliedtomulti-layercoatingsandisalsosuitableformanytypesofcoatings.Thismethodcanapplythepainttothesurfaceofthesandcorewell,andishelpfulforsprayingcornersorfacades.However,thebrushingoperationislabor-intensiveandslow,andtheresultsvaryfromoperatortooperator. Spraying:Thismethodisfasterthanbrushing,anditiseasytocoveralargeareawithoutleavingbrushmarks.However,aswithbrushing,thesprayingeffectmayvaryfromoperatortooperator.Theoperatormayoverlooksomeareas,oritmaybedifficulttoapplytodeeperrecessescorrectly,oroverspraymayoccur.Sprayingsolvent-basedcoatingscanalsocauseemissionsthatarenoteasytocollect. Flowcoating:Flowcoatingisfast,lesslabor-intensivethanbrushingorspraying,andeasytoautomate.Itisthebestchoiceforlargesandcoresandsandmolds,buttheflowcoatingsystemrequiresregularmaintenance. Dipcoating:Somefoundrieschoosetodiptheirsandcoresorsandmoldsinthecoating.Thisprocessprovidesgoodcoatingcoverageandcanbemechanized.Theeffectofautomaticdipcoatingisuniformandconsistent,suitableformassproduction.However,manualdipcoatingislaborintensiveandslow. Becausewaterandsolventwillexpandsignificantlywhenheated,nomatterwhichoftheabovemethodsisused,itneedstobedriedforaperiodoftimeafterapplyingtherefractorycoating.Thespecificdryingmethoddependsonwhetherthecoatingiswater-basedorsolvent-based..Somesolvent-basedcoatingscanusefiretoignitethecombustiblecomponentsinthecoatingtodrythecoating. Thereareavarietyofoptionalrefractorycoatingsonthemarket.Thechemicalcompositionandformulationdesignofthesecoatingsaredifferent.Theyneedtobeappliedcorrectlyaccordingtospecificprocessparameterstoachievegoodresults,includingcoatingthickness,dryingtime,viscosityandsolution.Thedegreeofdispersionofmediumrefractoryparticles.Thefoundryshouldconsultthepaintmanufacturertoobtainrecommendationsfortheuseofeachpaint,andstrictlyfollowtheserecommendations. (Source:"MODERNCASTING",adaptedfromLiuJincheng'stranslation)
Using paint on sand molds and sand cores, these four methods have their own advantages and disadvantages.
(Summary description)Foundriescanusefourmethodstoapplycoatingsonsandmoldsandcores,eachofwhichhasadvantagesanddisadvantages. Brushing:Brushingpaintonthesandmoldcanprovidegood,controllablecoverage.Thismethodcanbeeasilyappliedtomulti-layercoatingsandisalsosuitableformanytypesofcoatings.Thismethodcanapplythepainttothesurfaceofthesandcorewell,andishelpfulforsprayingcornersorfacades.However,thebrushingoperationislabor-intensiveandslow,andtheresultsvaryfromoperatortooperator. Spraying:Thismethodisfasterthanbrushing,anditiseasytocoveralargeareawithoutleavingbrushmarks.However,aswithbrushing,thesprayingeffectmayvaryfromoperatortooperator.Theoperatormayoverlooksomeareas,oritmaybedifficulttoapplytodeeperrecessescorrectly,oroverspraymayoccur.Sprayingsolvent-basedcoatingscanalsocauseemissionsthatarenoteasytocollect. Flowcoating:Flowcoatingisfast,lesslabor-intensivethanbrushingorspraying,andeasytoautomate.Itisthebestchoiceforlargesandcoresandsandmolds,buttheflowcoatingsystemrequiresregularmaintenance. Dipcoating:Somefoundrieschoosetodiptheirsandcoresorsandmoldsinthecoating.Thisprocessprovidesgoodcoatingcoverageandcanbemechanized.Theeffectofautomaticdipcoatingisuniformandconsistent,suitableformassproduction.However,manualdipcoatingislaborintensiveandslow. Becausewaterandsolventwillexpandsignificantlywhenheated,nomatterwhichoftheabovemethodsisused,itneedstobedriedforaperiodoftimeafterapplyingtherefractorycoating.Thespecificdryingmethoddependsonwhetherthecoatingiswater-basedorsolvent-based..Somesolvent-basedcoatingscanusefiretoignitethecombustiblecomponentsinthecoatingtodrythecoating. Thereareavarietyofoptionalrefractorycoatingsonthemarket.Thechemicalcompositionandformulationdesignofthesecoatingsaredifferent.Theyneedtobeappliedcorrectlyaccordingtospecificprocessparameterstoachievegoodresults,includingcoatingthickness,dryingtime,viscosityandsolution.Thedegreeofdispersionofmediumrefractoryparticles.Thefoundryshouldconsultthepaintmanufacturertoobtainrecommendationsfortheuseofeachpaint,andstrictlyfollowtheserecommendations. (Source:"MODERNCASTING",adaptedfromLiuJincheng'stranslation)
- Categories:Trade info
- Author:
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- Time of issue:2021-08-27
- Views:0
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