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1、STD-JIS B 7534-ENGL 3777 W 4733b08 0543822 OB3 UDC 621.753:531.717.86 . JIS . JAPANESE INDUSTRIAL STANDARD S teel Straightedges JIS B 75 1 4 - 1 9 7 7 Translated and Published by Japanese Standards Association Printed in Japan 7s Copyright Japanese Standards Association Provided by IHS under license
2、 with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 75L4-ENGL 3777 M 4733b08 0543823 TL8 = In the event of any doubt arising, the original Standard in Japanese is to be f
3、inal authority. t I Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 7514-ENGL 1977 m 4733b08 054
4、3824 95Li m UDC 621.753 : 531.717.86 JAPANESE INDUSTRIAL STANDARD J I S Steel Straightedges B 7514-1977 (Reaffirmed: 1993) 1. Scope This Japanese Industrial Standard specifies the steel straightedges of rectan- gular section and I section, hereinafter referred to as the It straightedges It. 2. Defin
5、itions The principal terms used in this standard shall be defined as given in Fig. 1. Applicable Standards : JIS B 7502-Micrometer Callipers for External Measurement JIS B 7503-Dial Gauges Reading in 0.01 mm JIS G 4401-Carbon Tool Steels Reference Standards : JIS B 7506-Gauge Block JIS B 7511-Precis
6、ion Levels JIS B 7519-Microindicators JIS B 7520-Indicating Micrometers JIS B 7523-Sine Bars JIS B 7538-Autocollimators Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reprod
7、uction or networking permitted without license from IHS -,-,- 2 B 7514-1977 Effective length (mm) Straightness Height unevenness Straightness B Height unevenness A Grade Special Grade Straightness (For refer- ence) (1) Height unevenness Fig. 1 300 500 1000 1500 2000 3000 3 4 6 8 10 14 10 14 24 34 44
8、 64 1.6 2 3 4 5 7 Rectangular Section I Section Width Working face Side face 3. Grades face /*Working face IYWorking face w Wid th f-4 Width The straightedges shall be, according to sectional dimensions and dimensional accuracy, classified into two: Grade A and Grade B. 4. Dimensional Accuracy 4.1 S
9、traightness and Height Unevenness of Working Face The tolerances on the straightness and on the height unevenness of working face of the straightedge shall conform to Table 1. Table 1. Straightness and Height Unevenness of Working Face Unit: p 1 I Copyright Japanese Standards Association Provided by
10、 IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 75Li-ENGL 1977 W Li733b08 05LiL82b 727 W Effective length 300 3 B 7514-1977 5 O0 1000 1500 2000 3000
11、 Remark: The numerical values in Table 1 are calculated from the following equations : A B Grade L For Grade A, (2 + -) 250 p 0.03 0.03 0.04 0.05 0.06 0.07 0.10 0.10 0.15 0.20 0.25 0.30 L For Grade B, (4 + 50) pm A L (1 +%) pm For Special Grade, 300 x 50 500 x 50 1000 x 60 1500 x 70 2000 x 80 3000 x
12、 120 x 10 x 10 x 12 x 14 x 16 x 18 300 x 40 500 x 40 1000 x 50 1500 x 60 2000 x 70 3000 x 100 x 8 x 8 x 10 x 12 x 14 x 16 I where L : effective length of straightedge (mm) 4.2 Parallelism and Width Unevenness of Side Faces The permissible values for the parallelism and width unevenness of side faces
13、 of the straightedge shall be 10 times as large as the straightness and height unevenness given in Table 1. 4.3 Perpendicularity of Working Face to Side Face The permissible values for the perpendicularity of the working face to the side face of the straightedge shall conform to Table 2. 5. Dimensio
14、ns The effective length, height (minimum) and width (minimum) of the straightedge shall conform to Table 3. Table 3. Dimensions Unit: mm Grade I Effective length (2) x height (min.) x width (min.) Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1
15、111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 7534-ENGL 1977 m Li933b08 0543827 bb3 m 4 B 7514-1977 6. Material and Finish The material of the straightedge shall be of SK 5 specified in JIS G 4401
16、or be equal to or superior to it. (Hs 35) for unhardened product, and Hv 490 (Hs 65) to Hv 620 (Hs 75) for hardened product. The working face of Grade A straightedge shall be lap-finished or be equal to or superior to it in finish, and the surface roughness shall be of 0.8 S for those of 1000 mm or
17、less in effective length and of 1.6 S for those exceeding 1000 mm in effective length. The working face of Grade B straightedge shall be grind-finished or be equal to or superior to it in finish, and the surface roughness shall be of 3.2 S for those of 1000 mm or less in effective length and 6.3 S f
18、or those exceeding 1000 mm in effective length. The hardness shall be Hv 170 (Hs 25) to Hv 245 Remark: The numerical values of Hs in parentheses are given for reference. 7. Method of Measurement of Accuracy 7.1 Straightness of Working Face The measurement of straightness of the working face shall be
19、 made by any one of the methods described below in a thermostatic room or in a place of little temperature change. shall be made on a flat and accurate plane in order to eliminate strain due to supporting of the straightedge. the measurement may be made by placing the side face on a plane. to 20 mm
20、from both ends shall be excluded from the measurement. This measurement However, if no flat accurate plane is available, The measurements shall be made at ten positions or more. The range (1) Measuring Method Using Level As shown in Fig. 2, place a straightedge on a horizontal and accurate plane and
21、 put two pieces of gauge blocks of the ;same dimensions on one end of the straightedge at interval of 100 mm. Put a level on the gauge blocks, and find an angle with horizontai face. Assuming the height at the end as zero, height of a point at a distance of 100 mm can be obtained by multiplying the
22、base length of 100 mm by that angle. horizontal face at 100 mm intervals from one end to the other, and draw a diagram as shown in Fig. 3. Then draw two parallel straight lines to put the diagram between themselves. both straight lines of which opening gets the smallest. accurately to one second. Fo
23、r example, the use of a level of a sensibility of scale makes it possible to measure a difference of height of 2 points 100 mm apart to 0.5 p m on 1/10 scale. Repeat the measurements of each height of the points above the Find the difference of height of The level to be used for measurement shall be
24、 capable of reading (approx. 10 seconds) accurate to 1/10 of the 0.05 mm l m Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reproduction or networking permitted without lice
25、nse from IHS -,-,- STD-JIS B 75L4-ENGL 1777 4933b08 0541828 5TT 20mm 5 B 7514-1977 100 200 300 400 500 600 700 800 900 IO00 (mm 1 Fig. 2 Level Straightedge Gauge block Fig. 3 Measuring Method Using Autocollimator The same method as specified in (1) shall be employed, if an accurate plane is availabl
26、e (see Fig. 4). If no accurate plane is provided, obtain the angle in horizontal direction by putting the side face of straightedge on the flat plane and then by fixing the reflecting mirror to the sine bar and letting it be in contact with the face to be measured of the straightedge (see Fig. 5). R
27、epeat the measurements in the same way as specified in (1) from one end to the other. The autocollimator used in the measurement shall be capable of measuring at least to one second. , Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, U
28、ser=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 7514-ENGL 1777 m 4733b 054L827 43b m 6 B 7514-1977 Fig. 4 Autocollimator ,+I , Reflecting mirror / /Straightedge I l , , t I/ i,. i / ,/,) / , ( 1 I / / / / , Tabl
29、e Accurate plane Fig. 5 Autocollimator Reflecting mirror (3) Measuring Method Using Comparison with Reference Straightedge As shown in Fig. 6, put a reference straightedge of good straightness proved by precise inspection together with the straightedge to be measured in parallel with the former on a
30、n accurate plane. microindicator is mounted on the reference straightedge, touch the spindle of a microindicator to the working face of the straightedge to be measured, and compare the straightness of the straightedge to be measured with that of the reference straightedge by sliding the stand on the
31、 reference straight- edge. by placing these two straightedges horizontally with these side faces piled side by side so that the working faces of these straightedges may come Put a stand to which a If no accurate plane is available, the measurement may be made into a vertical S tr plane. Fig. 6 ighte
32、dge -Reference straightec be measured ge Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reproduction or networking permitted without license from IHS -,-,- 7 B 7514-1977 7.2
33、 Height Unevenness Measure the height of the straightedge by using an indicating micrometer or a snap gauge with microindicator, and obtain the difference between the largest and the smallest values (see Fig. 7). Fig. 7 r ,Straightedge Indicating micrometer 7.3 Parallelism of Side Face Put a stand p
34、roviding a dial gauge on an accurate plane and apply its spindle onto the side face of the straightedge. the difference between the reading of the largest and the smallest values by sliding Find the stand or the straightedge (see Fig. 8). Fig. 8 Stand 7.4 Width Unevenness values by the measurements,
35、 using an outside micrometer, of the width of the straightedge (see Fig. 9). Find the difference between the largest and the smallest Fig. 9 u Outs ide micrometer Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not f
36、or Resale, 03/12/2007 20:40:22 MDTNo reproduction or networking permitted without license from IHS -,-,- 8 B 7514-1977 7.5 Perpendicularity of Working Face to Side Face Employ an apparatus providing a metal adapter at its lower end and a dial gauge at its upper end, as shown in Fig. 10. Set the indi
37、cation of the dial gauge to zero when a reference rectangular block is applied to the metal adapter, then place a working face of a straightedge, in place of the reference rectangular block, on the accurate plane, and move the apparatus applying the metal adapter to the side face. largest deflection
38、, from zero, of the indication of the dial gauge. Find the Fig. 10 Straightedge Metal adapter- ,-Dial gauge Stand 1 Remark: The measuring instruments used in the measurements of 7.1 (3) and 7.2 shall be capable of measuring to 0.5 ,um correctly. The dial gauge used in the measurements of 7.3 and 7.5
39、 shall comply with that specified in JIS B 7503 and the outside micro- meter used in the measurement of 7.4 with that specified in JIS B 7502. 8. Inspection The inspection of the straightedge shall be carried out on the dimensional accuracy, dimensions, material and finish, and the results shall be
40、in compliance with the requirements of 4., 5. and 6. 9. Designation of Product The designation of the straightedge shall be given in the order of the name, Example: Straightedge 500 A effective length and grade. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=
41、IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reproduction or networking permitted without license from IHS -,-,- 9. B 7514-1977 10. Markings The straightedge shall be marked with the following: (1) (2) Serial number of product Manufacturers name or its abbrev
42、iation (3) Manufacturing number (4) Grade (5) Symbol or letters indicating hardened product, if it is hardened Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reproduction or
43、 networking permitted without license from IHS -,-,- I. B 7514-1977 Edition 2 Japanese Text Established by Minister of International Trade and Industry Date of Establishment: 1959-03-30 Date of Revision: 1977-09-01 Date of ReaMirmation: 1993-09-01 Date of Public Notice in Oficial Gazette: 1993-09-06
44、 Investigated by: Japanese Industrial Standards Committee Divisional Council on Precision Machine Technical Committee on Straightedges This English translation is published by: Japanese Standards Association 1-24, h a s a k a 4, Minato-ku, Tokyo 107 Japan O JSA, 1980 Printed in Tokyo by Hohbunsha Co., Ltd. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:40:22 MDTNo reproduction or networking permitted without license from IHS -,-,-