1、ICs 01.040.1 7; 17.040.30 Supersedes June 1981 edition Prfen geometrischer Gren - Meschrauben - Teil 4: Innenmeschrauben - Begriffe, Anforderungen, Prfung In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throug
2、hout as the decimal marker. Foreword This standard has been prepared by the Normenausschu Technische Grundlagen (Fundamentals in Technology Standards Committee). The DIN 863 series of standards comprises the following: Part 1 : Standard design external micrometers - Concepts, requirements and testin
3、g Part 2: Fixed micrometers and depth micrometers - Concepts, requirements and testing Part 3: Special design external micrometers - Designs, requirements and testing Part 4: Internal micrometers - Concepts, requirements and testing Amendments The following amendments have been made to the June 1981
4、 edition. a) The terminology has been harmonized with the relevant international literature l. b) Specifications regarding repeatability have been modified. c) The standard has been editorially revised. Previous edition DIN 863-4: 1981 -06. 1 Scope This standard specifies design, dimensional and per
5、formance requirements for and the testing of internal micrometers with measuring capacities up to 500 mm, having 0,Ol mm scale intervals or digital increments and a span of 25 mm. 2 Normative references This standard incorporates, by dated or undated reference, provisions from other publications. Th
6、ese normative references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For un
7、dated references, the latest edition of the publication referred to applies. DIN 102 DIN 878 Dial gauges DIN 1319-1 DIN 1319-2 Reference temperatures for measuring instruments and workpieces Basic concepts in metrology - General concepts Basic concepts in metrology - Terminology relating to the use
8、of measuring instru- ments Continued on pages 2 to 7. Translation by DIN-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text. No pari of this translation may be reproduced without the prior permission of Ref. No. DIN 863-4 : 1999-0 _ V Deutsch
9、es Institut fur Normung e. V., Berlin. English price group 08 Beuth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). . Sales No. 0108 11.99 Page 2 DIN 863-4 : 1999-04 DIN 2250-1 GO ring gauges and setting ring gauges from 1 to 31 5 mm nominal diameter,
10、for general purposes and pneumatic length measuring instruments DIN 2257-1 Terminology used in dimensional metrology - Units, activities, checking instruments - Metrological concepts DIN 4768 Determination of surface roughness parameters Ra, R, and R, using electric stylus instruments - Concepts and
11、 measuring conditions DIN EN IS0 3650 Geometrical Product Specifications (GPS) - Length standards - Gauge blocks (IS0 3650 : 1998) l International vocabulary of basic and general terms in metrology (VIM), published by the International Organization for Standardization (ISO), 1993.*) 3 Terminology 3.
12、1 Concepts For the purposes of this standard, the concepts defined in DIN 1319-1, DIN 1319-2, DIN 2257-1 and l apply, in addition to the following: 3.1.1 Internal micrometer A device with an integrated, threaded material measure, used to measure internal dimensions (such as bores). Internal micromet
13、ers with 3-point contact on the object of measurement have retractable contact plungers with conical measuring elements. 3.1.2 Maximum permissible error Extreme value of an error permitted for micrometers as in this standard (cf. 5.21 in l); in this standard, termed limit of error and designated as
14、G. 3.1.3 Repeatability (of a measuring instrument) Ability of a measuring instrument to provide closely similar indications for repeated applications of the same measurand under the same conditions of measurement (from l). 3.2 Nomenclature See figures 1 to 3 for nomenclature used in this standard. 4
15、 Designation Designation of a type A2 internal micrometer (A2) in accordance with this standard with a measuring range of 1 O0 to 125 mm (1 00-1 25): Micrometer DIN 863 - A2 - 100-1 25 5 Requirements 5.1 Scales 5.1.1 Thimble The thimble should have a scale with 50 or 1 O0 divisions, with scale inter
16、vals of 0,Ol mm. The scale marks shall be cleanly cut. The scale spacing shall be at least 0,8 mm, and the scale mark thickness at least 0,08 mm but no greater than 0,2 mm. If the thimble is bevelled, the angle of the bevel shall be between 1 O“ and 20“ (see figure 4). The distance between the barre
17、l and the thimble surface should not exceed 0,3 mm (see figure 4). 5.1.2 Barrel The thickness of the fiducial line and the scale marks on the barrel shall not differ by more than 30 pm from that of the scale marks on the thimble. For micrometers having a 0,5 mm screw thread pitch, the 0,5 scale mark
18、s shall extend both above and below the fiducial line to clearly distinguish them from the 1 mm marks. 5.2 Digital display Digital displays shall be designed so that the measured value is clearly indicated at any spindle position. 5.3 Design features of internal micrometers with 2-point contact (typ
19、es A and B) 5.3.1 Spindle The spindle screw thread should have a pitch of 0,5 or 1 mm. There shall be no perceptible shake between the spindle and the nut. The spindle screw thread shall be fully engaged in the nut thread over the entire measuring range. *) Obtainable from Beuth Verlag GrnbH, Burggr
20、afenstrae 6, D-10787 Berlin. Page 3 DIN 863-4 : 1999-04 5.3.2 Spindle locking device If a spindle locking device is provided, it shall be designed so that it locks the spindle without altering the distance between the measuring faces by more than 2 pm. 5.3.3 Anvil Anvils may be adapted to special me
21、asuring purposes, for instance by fitting them with threaded inserts for thread measurement. In the case of type B micrometers, the measuring force shall be applied to the anvil in the direction of meas- urement only. The anvil may be interchangeable, allowing measurement outside of the micrometer a
22、xis. 5.3.4 Measuring faces Measuring faces of type A and B micrometers shall be rounded, and their radius shall be less than half the lowest value of the measuring range. 5.3.5 Extensions The measuring range of type A2 and B micrometers may be increased by means of extensions, which may have integra
23、ted circular gauge blocks as material measures. The measuring faces of the blocks shall be such that, in each case, a rounded measuring face comes in contact with a flat one. Connecting elements which join extensions to each other and to the micrometer shall be designed to ensure a rigid connection.
24、 The designs shown are for illustrative purposes only. Type Al X Type A2 (with extension) X 3 4 Detail x (design optional) Spindle locking device and indication at manufacturers discretion. 1 Measuring face 6 Barrel 2 Anvil 7 Fiducial line 3 Extension 8 Thimble 4 Analogue display 9 Digital display 5
25、 Spindle locking device Figure 1 : Internal micrometer with 2-point contact (nomenclature) Page 4 DIN 863-4 : 1999-04 The designs shown are for illustrative purposes only. Type B 3 4 b 5 Adjustable tolerance marks Adjustable anvil Measuring device (e.g. DIN 878 dial gauge) Dial indicator Fiducial li
26、ne Separation point for extensions Anvi I Detail X as in figure 1. Figure 2: Internal micrometer with adjustable anvil and 2-point contact (nomenclature) 5.4 Design features of internal micrometers with 3-point contact (type C) 5.4.1 Measuring faces For testing cylindrical bores, the three measuring
27、 faces of the micrometer shall be cylindrical so that there is linear contact along the face of the object of measurement. The radius of the faces shall be less than half of the lowest value of the measuring range. For special measuring purposes, measuring heads or contact plungers may be interchang
28、eable. The shape of the measuring faces shall be adapted to the measuring purpose (e.g. thread measurements). 5.4.2 Ratchet drive Micrometers shall be fitted with a ratchet drive to ensure centring and alignment in every position. The force acting on the measuring faces shall be specified by the man
29、ufacturer. The actual forces for microm- eters of the same type, the same measuring range, and produced by the same manufacturer shall not fluctuate by more than 50 YO. 5.4.3 Extensions It should be possible to extend the length of the micrometers in order to reach into deep or deep-level bores. The
30、 separation point of the micrometer shall guarantee a reliable connection. Each time an extension is used, the micrometer shall be reset, since extensions for this type of micrometer normally are not material measures, as are the ones described in subclause 5.3.5. 5.5 Material and design Micrometer
31、elements establishing and registering the dimension shall be of an alloyed tool steel or equivalent material. Measuring faces and other elements subjects to wear within the measuring section may be of hardmetal or another equivalent hard material. Measuring faces should not have any sharp edges. In
32、terms of surface roughness, the ten point height of irregularities, R, as defined in DIN 4768, shall be 0,8 pm or lower. The hardness of the faces shall be at least 760 HV 1 (equivalent to 62 HRC). 5.6 Adjusting devices Every micrometer shall be provided with devices to adjust the zero setting and t
33、o compensate for wear of the spindle and nut threads. It shall be possible for the user to operate these devices. 5.7 Setting the reading The zero and end values of internal micrometers are set by the manufacturer. Page 5 DIN 863-4 : 1999-04 Type C1 %l Detail xa) w 3 4 I Type C2 (with measuring face
34、s facing forward) 1 Contact plungers 2 Measuring face 3 Separation point for extensions 4 Ratchet drive a) Detail X as in figure 1 (but without locking device). Figure 3: Internal micrometer with 3-line contact (nomenclature) 1 Scale 2 Thimble 3 Barrel Figure 4: Barrel and thimble design 5.8 Limits
35、of error and tolerances The limits of error specified in table 1 shall not be exceeded, and shall be met at any randomly selected setting and - in the case of type A2 micrometers - with any randomly selected extension. NOTE: Any doubling of the limits of error is precluded because the specified valu
36、es apply for any setting, For extensions used with 2-point micrometers, the length tolerance shall be js 2. For type B micrometers, the repeatability limit, r, of the measuring device (e.g. dial gauge) shall be taken into consideration. including those at an extreme value. Page 6 DIN 863-4 : 1999-04
37、 Measuring range, in mm 3to 10 Over 10 up to 50 5.9 Reference temperature The reference temperature shall be 20 “C in accordance with DIN 102. Type C micrometers2) Type A and B micrometers1) Limits of error, Limits of error, Repeatability limit, G, in pm G, in pm r, in pm 4 4 4 4 4 - 6 Testing 6.1 L
38、imits of error G In the case of 2-point micrometers, the limits of error may be checked with ring gauges as in DIN 2250-1 or with another type of material measure, such as fixed calipers, gauge blocks or measuring jaws, or checked between the measuring faces of another dimensional measuring instrume
39、nt. Ring gauges shall be manufactured to JS 3. The limits of error of 3-point micrometers may also be checked with setting ring gauges as in DIN 2250-1. Where it is difficult to produce such gauges (e.g. when the gauges are to have a nominal size greater than 200 mm), other material measures may be
40、used, as long as these can ensure a reliable positioning of the micrometers measuring faces. In any case, the measuring faces shall be completely encompassed by the material measure. Gauges shall be manufactured to JS 3. Material measures should be selected which permit testing at points which are i
41、ntegral multiples of the nominal pitch, as well as at intermediate positions. This way, values obtained at different angles of rotation of the spindle can also be used to determine any periodic errors. Over 50 up to 100 Over 1 O0 up to 150 5 5 5 6 6 6 Over 150 up to 200 Over 200 up to 250 Over 250 u
42、p to 300 Over 300 up to 350 Over 350 up to 400 Over 400 up to 450 Over 450 up to 500 7 7 7 8 8 8 9 9 9 - - 10 11 12 13 - - - - - - 1) These values apply only to measurements taken along the instrument axis. For micrometers with an 2, Since all other errors are included in the repeatability limit, ra
43、nd G have the same value. adjustable anvil, the repeatability values for the integrated material measure apply. Page 7 DIN 863-4 : 1999-04 . . -. _. . Limit of error Maximum error - -5 l- i BO 82 84 86 88 90 Conventional true value of dimension, in mm - Figure 5: Limits of error for a micrometer wit
44、h a measuring range of 80 mm to 90 mm, set at the lowest value 6.3 Length of gauge blocks of extensions for types A and B micrometers The length of gauge blocks for extensions can be checked either using gauge blocks of grade O as in DIN EN IS0 3650 or with a suitable length measuring device. 7 Mark
45、ing Micrometers complying with this standard shall be legibly and permanently marked with the following informa- tion: - scale interval or digital increment; - measuring range; - manufacturers trademark or name. Extensions for types A and B micrometers with 2-point contact shall be marked with the nominal length.
