自攻螺丝自攻螺丝扭力强度.docx
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自攻螺丝自攻螺丝扭力强度.docx
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自攻螺丝自攻螺丝扭力强度
(4)TorqueStrength
TorqueWrench(0~150kgf)(150~750kgf)购买(150~300kgf)
ASME/FIP1000/SAEJ78,J81,J1237,J933/ISO898-7,ISO2702/DIN7500-1/IFI-113
2.TORSIONALSTRENGTHTEST扭力强度试验
FIP1000
ApplicableTo:
AllTappingScrews.
适用范围:
所有种类的自攻螺丝
TestPurpose:
Todetectpartshavinglowstrengthwhichmighttwistoffduringdrivingorseating.
测试目的:
为检查零件是否因为扭力不足而在组装或旋紧时扭断.
Specification:
Seechartsthatfollow.如下图示
Ut取扭力扳手上的扭力愷
最少2在喪具中
4定疆動工具巴就定仅
试少2牙虑在上而
£
卜9
Apparatusrequired:
测试装置
A.AppropriateSplitCollet.适当的夹具
B.ColletHolder.夹具座
C.ScrewTestingFixture.螺丝测试座
D.TorqueWrench;accuratewith+/-2%.准确度在2%以内的扭力扳手
SampleSize(MinimumRecommended):
4piecesperlot;lotsizenottoexceed250,000抽样数(建议最少):
每批4支,每批批量不超过250MPCS.
Procedure:
测试程序
APlacethesplitcolletintothecolletholderandscrewthefastenerintothecolletsuchthataminimumof2fullthreadsareinthecolletandaminimumof2threadsareabovethecollet.
将螺丝置入测试夹具中再将夹具放入夹具座,螺丝至少应有两个完全牙在夹具中,两牙在夹具上方.
B.Placethecolletholderinthescrewtestingfixtureandclampintoplace.
将夹具座固定在螺丝测试座上
C.Applytorquewithatorquewrenchuntiltheparttwistsoff.
扭转扳手直到螺丝扭断
D.Recordfailurevalueandcomparetotherequiredspecification.
记录破坏值且与规范值比较
Failure:
Parttwistsintwoatlessthanspecifiedminimum.
失效:
螺丝扭断值小於规范值
PossibleFailureCauses:
失效可能因素
A.CoreHardnesstoolow.心部硬度太低
B.CaseHardnesstoolow.表面硬度太低
CCaseHardnesstooshallow.有效渗碳层不足
DMinordiametertoosmall.最小径(牙底径)太小
ASME-2013
4.11.3TorsionalStrengthTest.Screwsshallbesecurelyclampedbysuitablemeans,suchthattheclampedportionthreadsarenotdamagedandthatatleasttwofullthreadsprojectabovetheclampingdevice,andthatatleasttwofullthreadsexclusiveofpoint,flutes,orendslot,areheldwithintheclampingdevice.(Ablindholemaybeusedinplaceofathreadedclampingdevice,providedtheholedepthsissuchastoinsurethatbreakagewilloccurbeyondthepointorthefulllengthoftheflutesorendslot).Bymeansof
asuitablycalibratedtorquemeasuringdevice,torqueshallbeappliedtothescrewuntilfailureoccurs.ThetorquerequiredtocausefailureshallnolessthantheminimumvaluegiveninTable50forthetypeandsizeofscrewbeingtested.Atypicalfixturefor
conductingtorsionalstrengthtestsontappingscrewsisdepictedinFig.4.
扭力强度测试:
螺丝应以适当的方式安全的夹於一相配合的分离盲孔或其他装置中以防止所夹紧
的螺纹不致损毁,并且露出至少2全牙於夹具上至少2全牙(不包括尾端、割尾、或凹槽)握於夹具之中。
(盲孔可以取代螺纹夹具,其孔深应能保证螺丝不会在尾端、割尾全长或尖尾位置断裂)以一
校正过且适当的扭力量测设备,测试直到断裂为止,当断裂时的扭力应不可小於表50之最小值。
典型的扭力强度测试设备请参考图4。
图4-扭力强度测试参考图
表50-自攻螺丝之扭力强度要求
螺丝规格
最小扭力强度,lb-in.
TypeA
Type
AB,B,BF
BP,BT
TypeC,D,F,G,T
TypeTRS
粗牙
细牙
粗牙
细牙
#2
4
4
5
6
6
…
#3
9
9
9
10
10
…
#4
12
13
13
15
14
…
#5
18
18
18
20
22
…
#6
24
24
23
27
24
…
#7
30
30
…
…
#8
39
39
42
47
48
…
#10
48
56
56
74
65
74
#12
83
88
93
108
93
…
#14
125
…
…
…
…
…
1/4
…
142
140
179
156
…
#16
152
…
…
…
…
…
#18
196
…
…
…
…
…
5/16
…
290
306
370
330
…
#20
250
…
…
…
…
…
#24
492
…
…
…
…
…
3/8
…
590
560
710
600
…
7/16
…
620
700
820
840
…
1/2
…
1020
1075
1285
…
1080
ASME—2000
TorsionalStrengthTestforAllTypesofScrews.
Theshankofthesample
screw(coatedoruncoated,asreceived)
shallbesecurelyclampedinamating.
split,blindholedie(seefollowingrequirementsaremet:
所有类型之螺丝的扭力强度测试
),orotherequivalentmeans,suchthatthe
:
将螺丝(接收时有涂层或无涂层)的杆部安全的夹在一个相配合的分离盲孔模具(参阅图1),或其他相同装置中,并满足下列规定:
(a)theclampedportionofthethreadsisnotdamaged
被夹部位的螺纹不能损伤
(b)atleasttwofull-formthreadsprojectabovetheclampingdevice
至少2全牙突出於夹具上方
(c)atleasttwofull-formthreadsexclusiveofthepointtaperortheflutes
areheldwithintheclampingdevice(ablindholemaybeusedinplaceof
theclampingdevice,providedtheholedepthensuresthatscrewbreakage
willoccurbeyondthepointtaperorthefulllengthoftheflutes)
至少2全牙(不包括尾端、割尾、或凹槽)夹在夹具之中。
(盲孔可以取代夹紧装置,其孔深应能保证螺丝不会在尾端、割尾全长或尖尾位置断裂)
Bymeansofasuitablycalibratedtorque-measuringdevice,torqueshallbe
appliedtothescrewuntilfailureoccurs.ThetorquerequiredtocausefailureshallequalorexceedtheminimumvaluespecifiedinTable4forthetypeandsizeofscrewbeingtested.
以一校正过之适当的扭力量测设备,测试螺丝直到产生断裂。
当断裂时的扭力应不可小於表4规定之最小值。
TYPICALTORSIONALSTRENGTHTESTFIXTURE
表4-自攻螺丝之扭力强度要求
TypeAB,B,BF,BT螺丝
TypeD,F,T螺丝
螺丝规格
扭力,Nm
螺丝规格
扭力,Nm
J78-2013SteelSelf-DrillingTappingScrews钢铁自钻螺丝
(IFI113与SAEJ78完全相同)
TorsionalStrength—Screwsshallnotfailwiththeapplicationofatorquelessthan
thetorsionalstrengthtorquespecifiedinTable5,whentestedinaccordaneewith5.1.1.
扭力强度:
当依据5.1.1段所述测试时,螺丝扭断时的扭力强度应不能小於表5所列的数值。
5.1.1TORSIONALSTRENGTHTE—TThesamplescrewshallbesecurelyclampedbysuitablemeans(Figure5)suchthatthethreadsintheclampedlengtharenotdamaged,andthatatleasttwofullthreadsprojectabovetheclampingdevice,andthatatleasttwofullthreadsexclusiveofpoint,flutes,orthreadcuttingslot,areheldwithintheclampingdevice.Bymeansofasuitablycalibratedtorquemeasuringdevice,torqueshallbeappliedtothescrewuntilfailureofthescrewoccurs.Thetorquerequiredtocausefailureshallberecordedasthetorsionalstrengthtorque.
扭力强度测试:
螺丝样品应安全的被夹紧於适当的夹座(图5)以防止螺丝夹紧长度部位的螺纹损伤,并且露出至少2个全牙於夹具上,至少2个全牙握於夹具之中但不包括尾端、凹槽、或割沟螺纹在内。
以一校正过适合的扭力设备测试直到断裂,断裂时所记录的扭力就是扭力强度扭力。
表5-TypeBSD与TypeCSD自钻螺丝的机械性与功能性要求
公称螺丝尺寸
最小扭力强度,lb-in
TypeBSD(宽牙)
TypeCSD(机械牙)
#4
14
14
#6
24
24
#8
42
48
#10
61
65
#12
92
100
1/4
150
156
333TORSIONALSTRENGT—Screwsshallnotfailwiththe即plicationofatorquelessthanthetorsionalstrengthtorquespecifiedinTables5Aand5B,whentestedinaccordanee
with.
扭力强度:
依据段所述测试时,螺丝扭断时的扭力强度不能小於表5所列的数值。
TorsionalStrengthTest—Thesamplescrewshallbesecurelyclampedbysuitablemeans
(Figure2)suchthatthethreadsintheclampedlengtharenotdamaged,andthatatleasttwofullthreadsprojectabovetheclampingdevice,andthatatleasttwofullthreadsexclusiveofpoint(2to31/2threadpitches)areheldwithintheclampingdevice.Ablindholemaybeusedinplaceofathreadedclampingdevice,providedtheholedepthsissuchastoinsurethatbreakagewilloccurbeyondthepoint(2to31/2threadpitches).Bymeansofasuitablycalibratedtorque-measuringdevice,torqueshallbeappliedtothescrewuntilfailureofthescrewoccurs.Thetorquerequiredtocausefailureshallberecordedasthetorsionalstrengthtorque.
扭断强度测试:
螺丝样品应以适当的方式牢固的夹紧(图2)以防止在夹具中的螺纹不被损伤,并且露出至少2个完全牙在夹具上,以及至少2个完全牙(不包括2-P的尾端在内)握於夹具之中。
一种盲孔可以使用来取代螺纹夹具,所提供之孔深需能确保断裂不会产生在尾端(2-P)处。
以一
支校正过的适当扭力设备测试直到断裂。
失效的扭力应被记录并作为扭断强度扭力。
TorqueWrenches—Torquewrenchesusedinalltestsshallbeaccuratewithin±2%ofthemaximumofthespecifiedtorquerangeofthewrench.Alternatively,atorque-sensingpower
deviceofequivalentaccuracymaybeused.
扭力扳手:
测试时使用的所有扭力扳手,其准确度应在扳手最大扭力范围的土2%之内。
此外拥有
相同准确度的扭力感应动力装置也可被使用。
表5-螺纹滚牙螺丝的机械性能与功能性要求
螺丝规格
最小扭力强度
in-lb
2-56
6
3-48—
10
4-40
14
5-40
22
6-32
24
8-32
48
10-24
65
1/4-20
156
5/16-18
330
3/8-16
600
7/16-14
840
1/2-13
1080
自攻螺丝的机械性
SAEJ933-2013MechanicalandQualityRequirementsforTappingScrews
与品质要求
TorsionalStrengthTest—Shankofsamplescrew(coatedoruncoated,asreceived)shall
besecurelyclampedinamating,split,blind-holedie(Figure1)orothermeans,such
thattheclampedportionofthethreadsisnotdamagedandatleasttwofullthreadsprojectabovetheclampingdeviceandatleasttwofullformthreadsexclusiveofpoint,flute(s),orendslotareheldwithintheclampingdevice.(Ablindholemaybeusedinplaceoftheclampingdevice,providingtheholedepthissuchastoinsurethatthebreakagewilloccurbeyondthepoint,orthefulllengthoftheflute(s)orendslot.)Bymeansofasuitablycalibratedtorquemeasuringdevice,applytorquetothescrewuntilfailureoccurs.ThetorquerequiredtocausefailureshallequalorexceedtheminimumvalueshowninTable2forthetypeandsizeofscrewbeingtested.
扭力强度测试:
螺丝样品的杆部(接收时是电镀或未电镀)应被稳固的夹於一相配合的分开盲孔中(图1)或用其他方式,使被夹紧的螺纹部分不受到损伤,并且露出至少2个全牙於夹具上及至少2个
全牙(不包括尾端、割尾或末端)握於夹具之中。
(一种盲孔可以用来取代夹具,其孔深应能保证螺丝不会在尾端、割尾全长、或尖尾位置断裂)。
以一支校正过且适当的扭力量测设备,施加扭力於螺丝上直到断裂为止,断裂时的扭力应等於或大於表2所列的最小值。
表2-自攻螺丝的最小扭力强度要求
螺丝规格
最小扭力强度,lb-in
TypeA
Type
AB,B,BF,B
G,BP和BT
TypeC
TypeC,D,F,G,T
粗牙
细牙
粗牙
细牙
4
4
5
6
5
6
9
9
9
10
9
10
12
13
13
15
13
15
18
18
18
20
18
20
24
24
23
27
23
27
30
30
-
-
-
-
39
39
42
47
42
47
48
56
56
74
56
74
83
88
93
108
93
108
125
-
-
-
-
-
1/4
-
142
140
179
140
179
152
-
-
-
-
-
196
-
-
-
-
-
5/16
-
290
306
370
306
370
250
-
-
-
-
-
492
-
-
-
-
-
3/8
-
590
560
710
560
710
7/16
-
-
-
-
-
-
1/2
-
-
-
-
-
-
3.5.3TORSIONASTRENGTHType2screwsshallnotfailwiththeapplicationofatorque
lessthanthetorsionalstrengthtorquespecifiedinTable6whentestedinaccordancewith.
扭力强度:
当依据段测试时,Type2螺丝扭断时的扭力强度应不能小於表6所列的数值。
表6-Type2螺纹滚成螺丝的机械性要求
螺丝规格
最小扭力强度
TorsionalStrengthTest—Thesamplescrewshallbesecurelyclampedbysuitablemeans(Figure3)suchthatthethreadsintheclampedlengtharenotdamaged,andthatatleasttwofullthreadsprojectabovetheclampingdevice,andthatatleastt
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