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1、JIS 8*1084 90 m 4933608 0009080 5 m o o s UDC 621.882.087.001.4 JAPANESE INDUSTRIAL STANDARD Method of Tightening Test for Threaded Fasteners JIS B 1084-1990 Translated and Published by Japanese Standards Association Printed in Japan 9s Copyright Japanese Standards Association Provided by IHS under
2、license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 01:18:03 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*1084 90 4933b08 0009081 7 In the event of any doubt arising, the original Standard iii Japanese is to be final au
3、thority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 01:18:03 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*I1084 90 W 4933bO 0009082 . 9 B 1084-1990
4、 Contents Page 1 . Scope 1 2 . Meanings of Terms and Symbols . 1 2.1 Meanings of Terms . 1 2.2 Symbols and Their Meanings . 1 3 . Testing Apparatus . 2 4 . Specimen 5 (Specimen A) 5 (Specimen B) 5 4.3 Bearing Surface Plate . 5 4.1 4.2 Set of Bolt. Nut. and Reference Bearing Surface Plate Set of Bolt
5、. Nut and Actual Use Bearing Surface Plate 4.3.1 Reference Bearing Surface Plate 5 4.3.2 Actual-Use Bearing Surface Plate 5 5 . Tes Conditions 6 6 . Obtaining Method of Tightening Characteristic Value 6 6.1 Obtaining Method of Torque Coefficient 7 6.2 Obtaining Method of Coefficient of Friction betw
6、een Threads 7 6.3 Obtaining Method of Coefficient of Friction between Bearing Surfaces . 7 6.4 Obtaining Method of Yield Clamping Force 8 6.5 Obtaining Method of Yield Tightening Torque . 9 6.6 Obtaining Method of Ultimate Clamping Force 9 7 . Report of Test Results . 9 Copyright Japanese Standards
7、Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 01:18:03 MDTNo reproduction or networking permitted without license from IHS -,-,- UDC 621.882.087.001.4 JAPANESE INDUSTRIAL STANDARD J I S Method of Tightening Test for
8、Threaded Fasteners B 1084-1990 1. Scope This Japanese Industrial Standard specifies the method of test for obtaining characteristic value for tightening (hereafter referred to as “tightening characteristic value“) by combination of bolts and nuts. In this Standard tightening characteristic values to
9、 be objective are torque coefficient , coefficient of friction between threads , coefficient of friction between bearing surfaces, yield clamping force, yield tightening torque and ultimate clamping force. Further, this Standard is applicable, as appropriate to cases of obtaining tightening characte
10、ristic values of threaded parts other than bolts and nuts , and tightening characteristic values of combinations of threaded parts and screw threads of construction body. However, this is not applicable to cases where tightening characteristic values of set screws to give compressive force external
11、threaded fasteners , wood screws and tapping screws for tapping by external threaded fastener its self, as well as of threaded fasteners given special self-locking function are to be obtained. 2. Meanings of Terms and Symbols 2,1 Meanings of Terms are in accordance with JIS B 1083 and in addition wi
12、th JIS B 0101, Meanings of main terms used in this Standard 2.2 Symbols and Their Meanings For the purpose of this Standard main symbols and their meanings are in accordance with Table 1. Further, symbols and their meanings of Table 1 are in accordance with JIS B 1083. Applicable Standards : JIS B 0
13、101-Glossary of Terms Relating to Fasteners JIS B 1001-Diameter of Clearance Holes and Counterbores for Bolts and Screws JIS B 1051-Mechanical Properties of Steel Bolts and Screws JIS B 1082-Stress Area and Bearing Area for Threaded Fasteners JIS B 1083-General Rules for Tightening of Threaded Faste
14、ners Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 01:18:03 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*LO84 90 4933608 0009084 2 2 B 1084-1990 Symbo
15、l (Y (Y Table 1. Symbols and Their Meanings Meaning Equivalent diameter of friction torque in bearing surface Internal diameter of bearing surface to contact External diameter of bearing surface to contact Tightening axial tension Ultimate clamping force Yield clamping force Torque coefficient Pitch
16、 of screw threads Tightening torque Yield tightening torque Threaded-portion torque Bearing surface torque Nominal diameter of screw thread Pitch diameter of screw threads Flank angle of thread ridge Flank angle at ridge perpendicular section of thread ridge tan (Y= tan (Y cos p ) Lead angle of scre
17、w thread tan p = P / (z. d2) 1 Tightening turning angle Coefficient of friction between threads Coefficient of friction between bearing surfaces 3. Testing Apparatus The testing apparatus shall be provided with the following conditions. (1) The testing apparatus shall be capable of detecting data of
18、 required measuring items to respective “tightening characteristic values to be obtainedf1 shown in Table 2 according to continuous record( ) or reading-out of indicator( 2). Notes (I) This indicates the continuous record by recorder or measurement at extremely short sampling intervals. ( 2 , This i
19、ndicates the pointer instrument such as torque meter or the like. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 01:18:03 MDTNo reproduction or networking permitted without license from IH
20、S -,-,- 3 B 1084-1990 Table 2. Tightening Characteristic Values and Required Measuring Matters Required measuring matter Specification item number for obtaining char acteris tic value Tightening character- istic value to be obtained 6.1 Torque coefficient (KI Coefficient of friction between threads
21、(.,us) O 6.2 Coefficient of friction between surface bearings ( P u ) Yield clamping force ( F, ) Yield tightening torque ( T ) O 6 . 3 O O 6.4 6.5 O O - A A - Ultimate clamping force F, 6.6 . - - _ Remarks 1. In the case of obtaining torque coefficient, coefficient of friction between threads and c
22、oefficient of friction between surface bearings, values of 0 marks shall be measured at the same time. 2. In the case of obtaining yield clamping force, yield tightening torque and ultimate clamping force, A marks and 0 marks shall be recorded continuously. obtaining only ultimate clamping force, in
23、dependent upon the tightening angle the maximum value of tightening axial tensions may be measured. However, in the case of (2) The testing apparatus shall be capable of applying tightening torque to bolt head or nut automatically or manually. Copyright Japanese Standards Association Provided by IHS
24、 under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 01:18:03 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Ba1084 90 4933608 O009086 6 4 B 1084-1990 The measuring accuracies (relative errors) of tightening torque, t
25、orque on fitted portion of threads, torque on bearing surfaces and tightening axial tension, unless particularly specified, shall be 2 2 % relative to the measuring value. In the case of obtaining the yield clamping force, and yield tightening torque, the detecting values of tightening angles shall
26、have linearity relative to the true values in the measuring range. Spring characteristics of bolted joint of testing apparatus shall be linear in the range of tightening axial tensions. Specifications of clamped part of testing apparatus (the part to be placed between the specimen bolt and the beari
27、ng surface of nut) and the set of specimens shail be, as a rule, in accordance with Fig. 1. Fig. 1. Specifications of Clamped Part of Testing Apparatus and Set Condition of Specimen (a) In the Case of Driving Nut (b) In the Case of Driving Bolt +DP +DP Specimen nut Dp : diameter of circumscribed cir
28、cle of bearing surface plate (Refer to Fig. 2) Lf : distance between bearing surfaces of bolt and nut L, : length of complete thread between bearing surfaces of bolt and nut Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, B
29、ernie Not for Resale, 05/16/2007 01:18:03 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 B 1084-1990 Notes (3) ( 4 , It is preferable to be t 2 1 d ( d is the nominal diameter of threads). In the case of obtaining yield clamping force, yield tightening torque and ultimat
30、e clamping force, it is preferable to make , 2 6 p ( P is the pitch of screw threads). - 4. SDecimen 4.1 Set of Bolt, Nut, and Reference Bearing Surface Plate (Specimen A) The specimen A is to be used for test for examining tightening characteristic value with uniting the conditions of bearing surfa
31、ces relating to actual using bolt, nut its self, and is the set of bolt and nut to be tested and reference bearing surface plate specified in 4.3.1. 4.2 Set of Bolt, Nut and Actual Use Bearing Surface Plate (Specimen B) The specimen B is the specimen to be used for test to be carried out for examini
32、ng tightening characteristic value relating to the set combined with actually used bolts, nuts and washers( 5 , and member to be tightened actually and is the set of bolts, nuts, and washers( 5, and actual-use bearing surface plate specified in 4.3.2. a Note ( 5 , Existence or abscence of washers is
33、 dependent upon actual using condition. 4;3 Bearing Surface Plate 4.3.1 Reference Bearing Surface Plate The specifications of reference bearing surface plate to be used for specimen A shall be in accordance with Fig. 2. 4.3.2 Actual-Use Bearing Surface Plate The actual use bearing surface plate to b
34、e used for specimen B shall be provided with required matters( 6, equivalent to clamped part to be tightened actually and, in the case where special designation relating to the shape and dimensions does not exist, shali be in accordance with Fig. 2. Further, for obtaining the tightening characterist
35、ic value under actual condition more aculately , it is preferable to manufacture the bearing surface plate by cutting out the part to be applied to bearing surface from the actual clamped part. hardness, surface roughness, surface treatment, etc. Note ( 6, Required matters contain the material, work
36、ing conditions, Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 01:18:03 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S B*L084 70 W 4733608 0007088 T 6 B 10
37、84-1990 Fig. 2. Specifications of Reference Bearing Surface Plate Sha.pe is .arbitrary I Hardness HRC 55 to 60 d : nominal diameter of screw thread s : width across flats of bolt and nut Q : dh : e : diameter of circumscribed circle of bearing surface plate bolt hole diameter in accordance with grad
38、e 1 of JIS B 10011 chamfering dimension (Refer to JIS B 1001) 5. Test Conditions Test conditions shall be in accordance with the following. (1) For specimens of 4.1 and 4.2, unless there is special reason, not used specimen shall be used and these, as a rule, not be reused. In the case of test to ob
39、tain tightening characteristic value for repeating use, the history of individual specimen shall be made clear. (2) Attach any one of bolt head or nut so as not to turn to testing ap- paratus and apply tightening torque to the other. consider the bearing surface plate as one part of clamped part, an
40、d so fix to the testing apparatus body as not to turn together. In the case where in specimen B of 4.2, the test is carried out by inserting a washer between the bolt head or nut and the bearing surface plate, do not fix intentionally the washer. At that time, (3) Carry out the test with making clea
41、r the specifications of bolt, nut, washer and bearing surface, specifications of testing apparatus, set condition of specimen, lubricating conditions, tightening turning speed and environment of test Refer to (1) to (10) of 7.1. Further, unless specified relating to tightening turning speed, it is p
42、referable to make the degree of 4 times per min. 6. Obtaining Method of Tightening Characteristic Value Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/16/2007 01:18:03 MDTNo reproduction or networ
43、king permitted without license from IHS -,-,- 7 B 1084-1990 6.1 Obtaining Method of Torque Coefficient The obtaining method of torque coefficient shall be as follows. (1) Measure the values of tightening axial tension and tightening torque() at an arbitrary point in the range of 50 to 80 % of bolt a
44、xial tension( 7 , corresponding to specified yield point or Standard proof stress of bolt. tightening axial tension and number of measuring points are specified otherwise, follow the specification. However, in cases where the range of value of Notes ( 7 , In the case of steel bolt, it shall be the v
45、alue of the minimum value of yield point or proof stress specified in each strength division in JIS B 1051 multiplied by the effective sectional area specified in JIS B 1082. (*) By measuring the torque on fitted portion of threads and torque on bearing surfaces, the sum may be taken as the value of
46、 tightening torque. (2) Take the calculated value (in the case of not less than two measuring points, the average value of calculated values) obtained by substi- tuting values of tightening axial tension Ff and tightening torque formula (1) as the torque coefficient K of the specimen. T f measured a
47、ccording to the method specified in (1) into the T K=- (1) Ffd 6.2 Obtaining Method of Coefficient of Friction between Threads The obtaining method of coefficient of friction between threads shall be in accordance with the following. (1) Measure the values of tightening axial tension and torque on f
48、itted portion of threads() at an arbitrary point in the range of 50 to 80 % of axial tension(7) of bolt corresponding to Standard yield point or Standard proof stress of bolt. However, in the case where the range of values of tightening axial tension and number of measuring points are determined otherwise, follow the specifications. Note () By measuring the tightening torque and torque on bearing surfaces, the difference may be taken as the value of torque on