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1、量具材料及工艺Measuringtools,materialsandprocessI.workingconditionsofmeasuringtoolsandperformancerequirementsofsteelformeasuringtoolsThemeasureisusedtomeasurethesizeofworkpiecetool,suchascaliper,micrometer,gaugeandgaugeetc・・Becausethemeasuringtoolisalwayssubjecttofrictionandcollision
2、duringtheuse,theraingaugeitselfmusthaveveryhighsize,accuracyandconstancy,sothefollowingperformanceisrequired:(1)highhardnessandhighwearresistance・Thisensuresthatitwillnotbequicklywornoutforlongtermuseandwillloseitsaccuracy.(2)highdimensionalstabilitytoensurethatthegaugekeepsit
3、sshapeandsizeconstantduringuseandstorage.(3)sufficienttoughnesstoensurethatthegaugeisnotdamagedbyaccidentalcollisionduringuse・(4)corrosionresistanceunderspecialconditions・Two,commonlyusedmeasuringtoolsteelDifferenttypesofsteelcanbeusedaccordingtothetypeandaccuracyrequirementso
4、fmeasuringtools:(1)ameasuringtoolwithsimpleshapeandlowprecisionrequirements.Carbontoolsteelcanbeused,suchasT10AandT11A.T12A.Becausethehardenabilityofcarbontoolsteelislow,waterquenchingwithlargesizewillcausegreaterdeformation.Therefore,thiskindofsteelcanonlybemadeofsmallsize,si
5、mpleshape,lowprecisioncaliper,sampleplate,gaugeandothermeasuringtools・(1)measuringhighprecision(suchasgauge,gaugematerialisusuallyusedinhighcarbonlowalloytoolsteel・SuchasCr2,CrMn,CrWMnandbearingsteel,GCr15andsoon.BecausethiskindofsteelismadeofalloyelementssuchasCr,MnandWinhigh
6、carbonsteel,itcanimprovehardenability,reducequenchingdeformation,improvewearresistanceanddimensionalstabilityofstee1.(2)formeasuringtheshapeissimple,theaccuracyisnothigh,sothevulnerable,suchassimpleflatrulerandlargesample,calipers,gauges,thecarburizingsteel15.20and15Crand20Cre
7、tc.・Butthegaugeshallbeusedaftercarburizing,quenchingandlowtemperaturetempering・Aftertheabovetreatment,thesurfacehashighhardness,highwearresistance,andtheheartmaintainsenoughtoughness・Canalsousemediumcarbonsteel50,5560,65manufacturingtools,butmustbequenchedandtemperedtreatment,
8、andthenbyhigh-frequencyquenching,temperingafteruse・Alsoensure
