自攻螺丝自攻螺丝-扭力强度.doc

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1、(4)TorqueStrengthTorqueWrench(0~150kgf)(150~750kgf)購買(150~300kgf)ASMEB18.6.3/FIP1000/SAEJ78,J81,J1237,J933/ISO898-7,ISO2702/DIN7500-1/IFI-1132.TORSIONALSTRENGTHTEST扭力強度試驗FIP1000ApplicableTo:AllTappingScrews.適用範圍：所有種類的自攻螺絲TestPurpose:Todetectpartshavinglowstrengthwhichmighttwistoffduringdrivingor

2、seating.測試目的：為檢查零件是否因為扭力不足而在組裝或旋緊時扭斷.Specification:Seechartsthatfollow.如下圖示Apparatusrequired:測試裝置A.AppropriateSplitCollet.適當的夾具B.ColletHolder.夾具座C.ScrewTestingFixture.螺絲測試座11D.TorqueWrench;accuratewith+/-2%.準確度在±2%以內的扭力扳手SampleSize(MinimumRecommended):4piecesperlot;lotsizenottoexceed250,000抽樣數(建

3、議最少)：每批4支,每批批量不超過250MPCS.Procedure:測試程序A.Placethesplitcolletintothecolletholderandscrewthefastenerintothecolletsuchthataminimumof2fullthreadsareinthecolletandaminimumof2threadsareabovethecollet.將螺絲置入測試夾具中再將夾具放入夾具座,螺絲至少應有兩個完全牙在夾具中,兩牙在夾具上方.B.Placethecolletholderinthescrewtestingfixtureandclampinto

4、place.將夾具座固定在螺絲測試座上C.Applytorquewithatorquewrenchuntiltheparttwistsoff.扭轉扳手直到螺絲扭斷D.Recordfailurevalueandcomparetotherequiredspecification.記錄破壞值且與規範值比較Failure:Parttwistsintwoatlessthanspecifiedminimum.失效：螺絲扭斷值小於規範值PossibleFailureCauses:失效可能因素A.CoreHardnesstoolow.心部硬度太低B.CaseHardnesstoolow.表面硬度太低C

5、.CaseHardnesstooshallow.有效滲碳層不足D.Minordiametertoosmall.最小徑(牙底徑)太小ASMEB18.6.3–20134.11.3TorsionalStrengthTest.Screwsshallbesecurelyclampedbysuitablemeans,suchthattheclampedportionthreadsarenotdamagedandthatatleasttwofullthreadsprojectabovetheclampingdevice,andthatatleasttwofullthreadsexclusiveofp

6、oint,flutes,orendslot,areheldwithintheclampingdevice.(Ablindholemaybeusedinplaceofathreadedclampingdevice,providedtheholedepthsissuchastoinsurethatbreakagewilloccurbeyondthepointorthefulllengthoftheflutesorendslot).Bymeansofasuitablycalibratedtorquemeasuringdevice,torqueshallbeappliedtothescrewu

7、ntilfailureoccurs.ThetorquerequiredtocausefailureshallnolessthantheminimumvaluegiveninTable50forthetypeandsizeofscrewbeingtested.AtypicalfixtureforconductingtorsionalstrengthtestsontappingscrewsisdepictedinFig.4.扭力強度測試：螺絲應以適