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Using paint on sand molds and sand cores, these four methods have their own advantages and disadvantages.

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
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  • Time of issue:2021-08-27
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Foundries can use four methods to apply coatings on sand molds and cores, each of which has advantages and disadvantages.
 
Brushing: Brushing paint on the sand mold can provide good, controllable coverage. This method can be easily applied to multi-layer coatings and is also suitable for many types of coatings. This method can apply the paint to the surface of the sand core well, and is helpful for spraying corners or facades. However, the brushing operation is labor-intensive and slow, and the results vary from operator to operator.
 
Spraying: This method is faster than brushing, and it is easy to cover a large area without leaving brush marks. However, as with brushing, the spraying effect may vary from operator to operator. The operator may overlook some areas, or it may be difficult to apply to deeper recesses correctly, or overspray may occur. Spraying solvent-based coatings can also cause emissions that are not easy to collect.
 
Flow coating: Flow coating is fast, less labor-intensive than brushing or spraying, and easy to automate. It is the best choice for large sand cores and sand molds, but the flow coating system requires regular maintenance.
 
Dip coating: Some foundries choose to dip their sand cores or sand molds in the coating. This process provides good coating coverage and can be mechanized. The effect of automatic dip coating is uniform and consistent, suitable for mass production. However, manual dip coating is labor intensive and slow.
 
Because water and solvent will expand significantly when heated, no matter which of the above methods is used, it needs to be dried for a period of time after applying the refractory coating. The specific drying method depends on whether the coating is water-based or solvent-based. . Some solvent-based coatings can use fire to ignite the combustible components in the coating to dry the coating.
 
There are a variety of optional refractory coatings on the market. The chemical composition and formulation design of these coatings are different. They need to be applied correctly according to specific process parameters to achieve good results, including coating thickness, drying time, viscosity and solution. The degree of dispersion of medium refractory particles. The foundry should consult the paint manufacturer to obtain recommendations for the use of each paint, and strictly follow these recommendations.
 
(Source: "MODERN CASTING", adapted from Liu Jincheng's translation)
 
 
 
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