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emes,andrepeatedpracticaldrills.Gradually,Imasteredthecoreskillsofeachworkingprocedure:rammingsandevenlyinlayersanddesigningreasonableventgroovestoreduceblowholesandsandholesincasting;matchingcurrentaccordingtoplatethickness,adoptingauniformzigzagtravelspeedandthoroughlycleaningweldingslagaftereachweldingpass;tensioningmolybdenumwiretightlybeforewirecuttingandsettingdischargecompensationpreciselyaccordingtoworkpiecethicknesstogreatlyimprovemachiningaccuracy.
Thefull-daytrainingonWednesdaycoveredforging,wirecutting,group-wide3DprintingandcyclicpracticeonCNClathes,whereIalsoencounteredvarioustechnicaldifficultiesin3Dprintingoperation.Initially,unreasonableslicingparameterscausedproblemssuchaswarpingatthebottomofprintedmodels,largeinterlayergapsandloosefilling.Byadjustinghotbedtemperature,reducingtheprintingspeedofthefirstlayerandoptimizingfillingdensity,togetherwithstandardizingthepost-printingpolishingandsupportremovalprocedures,Ifinallyobtainedwell-formedmodelswithaccuratedimensionsandsmoothsurfaces.Materialchemistryexperimentsranthroughthefour-dayinternship.Afterrepeatedpracticeofthewholeworkflowincludingspecimencutting,roughandfinegrinding,polishing,etching,metallographicmicroscopicobservationandhardnesstesting,Itrulyunderstoodthecorrelationbetweenthecompositionandinternalmetallographicstructureofmetalmaterialsandprocessingtechnologiessuchascasting,forgingandwelding.Irealizedthatdifferenthotworkingprocesseswouldchangegrainmorphologyanddirectlyaffectservicepropertiesincludinghardnessandstrengthofparts.Anintegratedengineeringthinkingthat"materialpropertiesdetermineprocessingtechnologies,andprocessingtechnologiesmodifymaterialperformances"wasestablishedinmymind,freeingmefromviewingmaterialexperimentsandmechanicalprocessinginisolation.
Thursdaywasdesignatedforcomprehensiverotationtrainingacrossalltrades,wherestudentsfromMaterialClassOneandMaterialTwotookfulltrainingprojectscoveringbenchwork,turning,milling,grinding,casting,forging,welding,numericalcontrolmachining,3Dprinting,lasercuttingandwirecutting.ItalsoservedasacomprehensiveassessmentofwhatIhadlearnedinthepreviousthreedays.Intraditionalcoldworkingtraining,filing,drillingandassemblyinbenchworkdemandedgreatpatienceandprecisecontrolofhandstrength.Myarmsachedafterlonghoursofmanualoperation,yetonlyrepeatedfilingandpolishingcouldguaranteeaccurateflatnessofparts.Whenoperatingmillingmachinesandgrinders,feedrateandcuttingspeedhadtobestrictlycontrolled;slightcarelessnesswouldleadtoscrappedworkpiecesduetoovercutting.IntheprogrammingsessionforCNCturningandmilling,Iattemptedtowritecompletemachiningprogramsforsteppedshaftsandgroovedparts.Iindependentlyfinishedthewholeprocessfromprograminputandsingle-blocktrialruntocontinuousautomaticmachining,andtrulyexperiencedtheadvantagesofhighprecisionandhighefficiencybroughtbydigitalmanufacturing.Lasercuttingissuitableforrapidb