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1、中级车工考试题Mid-levelcartest(includinganswers)Onepoint,25points・Wormandwormgearisusedtotransferthetransmissionoftwoshaftsof60degrees・Whentheturningmoduleislessthan5MM,themethodofcuttingandcuttingcanbeused・Inordertopreventthethreecuttingedgesfrombeingcutatthesametime,itcanbeus
2、edtocutthecuttingedge・Thedistaneebetweentheeccentricpartsandthetwobusinesiscalledthe"eccentricity〃・Theamountofcuttingshouldnotbetoolargewhentheturningcenteriseccentric・Apercentageof1OMMinfullrangeisnotallowedtomeasureeccentricitybetweenthetwotop.Inordertoreducetheradialf
3、orceofthecutteragainsttheworkpiece,themainAngleoftheturningtoolshouldbeincreased・Usefour-jawsingle-movingchucktofindthepositive,nottheprecisionoftheturningpositionandthehighprecision.Therotationaccuracy,stiffnessandvibrationresistaneeofthemainshaftaffectthemachiningaccur
4、acyandsurfaceroughnessoftheworkpiece・Whenthenutsareseparated,neithertheslideboxnorthebladewillmove・Theswitchinggearsusedwhenthegearsarecutarenotthesameastheswitchgearsusedforturningtheworm・Thetopofthelatheisnothighbeforeandafterthelathes,andtheprocessingholesareova1.Thep
5、rocessofheattreatmentoftheworkpiecetoachievethedesiredchemicalperformanceiscalledheattreatmentprocess・Inmachineprocessing,thespareamountoftheprocessislefttoolittlefortheprocessingreliability・Whenworkingwithlongandthinshaftworkpieces,ifonlyhalfoftheworkingprocessiscarried
6、out,theworkpieceisonthelathe,whichcanbesupportedbywoodenblocksinthemiddlepart.Thecenterholeisthebenchmarkforthewirerod,whichshouldberepairedaftereachheattreatment・Inordertoensurethecorrectmeshingofwormandmatchingwormgear,thewormwheelwiththesamedimensionofwormisusedtoproc
7、essthematchingwormwhee1.18,finecarlinemorethread,must,inturn,willbethesamedirectiononeachwirethreadtoothflankofthecar,carinturnagainanotherdirectiononwirethreadtoothprofile・Inthenationalstandard,thelargediameter,middlediameterandpathofthetrapezoidthreadaredefinedasatoler
8、ances.Onthefour-jawsingle-movingchuck,themethodusedtofindthepositiveeccentriccirclewiththeunderlineison
