Precision Casting Equipment: Analysis of Problems in the Water Glass Shell Process
Therearevariousproductionprocessesforprecisioncastingequipment.Today,theeditorwillintroducethewaterglassshellprocess,whichhasahistoryof50yearsinChinaandisusedbymorethan70%ofprecisioncastingequipmentmanufacturers.However,atthesametime,thisproductionprocesshasitsownshortcomings.Today,theeditorwillanalyzeandinterpretitforeveryone.TheinherentdisadvantageofwaterglassbinderisitshighNa2Ocontent,andthehigh-temperaturestrengthandcreepresistanceoftheshellarefarinferiortothoseofsiliconsolventshell(only1/30-1/50ofit).Inaddition,therefractorymaterialusedforthesurfacelayerisquartzsand(powder)withlowqualityandpoorparticlesizedistribution,andthehardenerisstilllimitedtousingammoniumchloride,soitisinevitablethathigh-qualityprecisioncastingscannotbeobtained.2.Theproductionconditionsfortheshellarepoor,andthereisalackofstrictcontrolovertheproductionprocessandparameters.Duetothestrongcorrosivenessofhardeningagentsandthesimplicityofdustremovalequipment,fewworkshopshaveaproductionenvironmentwithconstanttemperature,humidity,anddustremoval.Thecoatingpreparation,hardening,airdrying,dewaxingandotherprocessesthataffectthequalityoftheshellandcastingsarerarelystrictlycontrolledaccordingtoindustryregulations.Regulartestingofcoatingviscosity,smearweight,hardenerconcentration,pHvalue,etc.Thetemperature,humidity,windspeed,andotherfactorsattheairdriedareaoftheshellarenotcontrolled,resultinginmassscrapqualityaccidentsoftenoccurringduringhigh,low,orrainyseasons.Inshort,mostfactoriesremainatthestageofmanualworkshops,relyingonskillsratherthanscientificqualitymanagementforproduction.Thisisoneoftheimportantreasonsfortheunstablecastingquality,highscraprate,andhighrepairrateofwaterglassshellsfordecades.Thewaterglassshellprocesshastheabovetwoproblems.Inresponsetothesetwoissues,theXinhangPrecisionCastingEquipmenteditorwillprovidecorrespondingsolutionsforeveryoneinthenextepisode.Wehopeeveryonewillpayattentiontothemontime.
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