1、UDC 621.022.61.8: 621.753.1 : 531.7.083 DEUTSCHE NORM June 1982 Rolling bearings I Gauging methods for dimensional and running tolerances I 620 Part 1 Wlzlager; Messverfahren fr Mass- und Lauftoleranten Supersedes January 1978 edition As it is current practice in standards published by the Internati
2、onal Organization for Standardization (ISO), the comma has been used throughout as a decimal marker. Contents Page 1 Field of application and purpose 2 2 General conditions . 2 2.1 Treatment of the rolling bearings before gauging. 2 2.2 Reference temperature . 2 2.3 Measuring instruments . 2 2.4 Mea
3、surement zone 2 2.5 Reference face 3 3 Dimension letters and symbols . 3 3.3 Subscripts . 3 3.1 Dimension letters . 3 3.2 Symbols . 3 4 Methods for the checking and measurement of rolling bearing components 3 4.1 Measurement of diameters on cylindrical surfaces (bore diameters, outside diameters) 3
4、4.2 Measurement of the width . 3 4.3 Checking of the edge distance 4 4.4 Measurement of the position of the bearing ring faces in relation to one another 4 4.4.1 Wall thickness variation of the single ring (radial bearing) 4 4.4.2 Washer thickness variation (thrust bearing) . 4 4.4.3 Face runout wit
5、h bore, Sd . 4 4.4.4 Variation of outside surface generatrix inclination with face, SD . 5 Page 4.4.5 Raceway parallelism with face (radial bearing with corresponding raceway profile) 5 5 Methods of measurement on the assembled bearing . 5 5.1 Radial runout . 5 5.1.1 Radial runout of assembled beari
6、ng inner ring, Ki, (radial bearings with the exception of tapered roller bearings and single row angular contact ball 5.1.2 Radial runout of assembled bearing outer ring, K, (radial bearings with the exception of tapered roller bearings and single row angular contact ball 5.1.3 Radial runout of asse
7、mbled bearing inner ring, Ki, (tapered roller bearings and single row angular contact ball bearings) . 5 bearings) . 5 bearings) . 5 5.2 Face runout 6 5.2.1 Assembled bearing inner ring face runout with raceway, Sh (groove type ball bearings) . 6 5.2.2 Assembled bearing outer ring face runout with r
8、aceway, Se, (groove type ball bearings) . 6 5.2.3 Assembled bearing inner ring face runout with raceway, S, (tapered roller bearings and single row angular contact ball bearings) . 6 Continued on pages 2 to 7 DIN 620 Part 1 Engl. Price group 7 Sole sale rights of German Standards (DIN-Normen) are wi
9、th Beuth Verlag GmbH, Berlin 30 04.83 Sales No. 0107 Page 2 DIN 620 Part 1 Measuring force F Nominal range 1 Field of application and purpose 1.1 Concepts relating to dimensions and tolerances for rolling bearings are defined in DIN IS0 1132, but not the gauging methods by which these tolerances can
10、 be measured in conformity with the definitions. The purpose of this standard is therefore to specify methods by means of which rolling bearing tolerances can be measured in conformity with the definitions even outside special measuring laboratories. Radius of measurinc tip 1.2 The tolerances define
11、d in DIN IS0 1132, the numerical values of which are laid down in DIN 620 Part 2, Part 3 and Part 6, apply as a general rule to individual bearing components immediately after manu- facture, for parts which are not subjected to external forces, including measuring forces. They represent tolerances f
12、or the final inspection of the components concerned by the manufacturer, and in particular they do not allow any direct conclusions to be drawn in respect of the correct functioning of the bearings. Bore diameter d O u tsid e diameter D 1.3 In accordance with this standard, deviations can be made fr
13、om the gauging methods free of measuring forces, on condition that the deformation in the direction of measurement caused by the measuring force and by the dead weight of the component concerned amounts to less than 10% of those tolerances which are being checked in respect of compliance. - 10 15 0.
14、8 10 30 1.5 23 30 - 1,5 2.5 all sizes 1,s 2.5 1.4 It is presupposed that the condition specified in subclause 1.3 is being complied with in the case of the gauging methods described in clauses 4 and 5, with the measuring forces laid down in subclause 2.3.3. As regards bearing components which exhibi
15、t small cross sections only, and which are therefore more prone to deformation, it will be necessary to adopt other gauging methods, preferably methods free of measuring forces. 1.5 The measurement of the assembled bearing radial runout and face runout accuracies in accordance with subclauses 5.1 an
16、d 5.2 is intended to act as an acceptance inspection for the benefit of the user, who is unable in some cases to dismantle the rolling bearings. 1.6 Checks of the rolling bearing tolerances in accord- ance with the conditions described in subclauses 1.3 to 1.5 above do not correspond to the conditio
17、ns outlined in subclause 1.2, but the results of these checks are quite adequate in practice, as experience has demonstrated, on condition that the measurements are assessed under the following aspects: 1.6.1 The exceeding of the tolerance in accordance with subclause 4.1.4 (Ah or ADs) must not lead
18、 to rejection of the bearing in the case of measurements on the assembled rolling bearing or of measurements made a long time after completion of manufacture. 1.6.2 For the radial runout of the inner ring or of the outer ring, respectively, on the assembled bearing, in accordance with subclause 5.1,
19、 Kh and K, have been laid down in accordance with DIN 620 Part 2. The magnitude of these values coincides with the values of wall thickness variations Ki or K, respectively, applying to the single ring. In case of doubt, the measurement on the single ring shall be determining. 1.7 Other gauging meth
20、ods are permissible. In arbitra- tion procedures, the gauging methods described in this standard shall apply. 2 General conditions 2.1 Treatment of the rolling bearings before gauging Before gauging, any grease or corrosion preventive com- pound adhering to the rolling bearings shall be removed if i
21、t is likely to affect the measurement results. A suitable organic solvent, with a small addition (x 3 %) of machine oil or acid-free kerosene shall be used to wash the rolling bearings, because otherwise the surfaces completely devoid of grease will tend to rust. After completion of gauging, the rol
22、ling bearings or rolling bearing components shall be washed again immediately and coated with grease. 2.2 Reference temperature The reference temperature shall be 20C. The object measured, the reference piece and the measuring instru- ment shall all exhibit the same temperature at the time of measur
23、ement. 2.3 Measuring instruments 2.3.1 Gauge blocks (end measuring blocks) conforming to DIN 861 Part 1, accuracy grade I. 2.3.2 Precision dial indicators with mechanical indica- tion conforming to DIN 879 Part 1. 2.3.2.1 Precision dial indicators with mechanical indica- tion conforming to DIN 879 P
24、art 1, scale interval 1 pm. 2.3.2.2 Precision dial indicators with mechanical indica- tion conforming to DIN 879 Part 1, scale interval 10 pm. 2.3.3 Measuring forces and radius of measuring tip Table 1. mm N mm over ,up to( max. 1 min. 2.4 Measurement zone When checking the dimensions of the bore di
25、ameter and of the outside diameter, the deviations on the “Not Go“ side are not applicable to measurements in radial planes situated at distances of less than 2 . r2smax from the side faces of the bearings (values for r2smax in accord- ance with DIN 620 Part 6). DIN 620 Part 1 Page 3 2.5 Reference f
26、ace The reference face of the ring is the unstamped face, and in the case of rings of single row angular contact ball bearings and of tapered roller bearings, the reference face is the face which absorbs the axial thrust. In the case of shaft washers and housing washers, the reference face is the en
27、d face facing the raceway. Note: Because a directionally orientated insertion of the rings into the processing machines is often impos- sible to achieve in the modern flow-line production of radial rolling bearings, the tolerances of a ring or of a bearing will be deemed to have been com- plied with
28、 even in cases where they have been complied with in respect of either one of the two side faces. In such cases therefore the position of the marking or stamping is irrelevant. 3 Dimension letters and symbols 3.1 Dimension letters d nominal bore diameter D nominal outside diameter B C T 3.2 Symbols
29、A V nominal width of inner ring nominal width of outer ring, if different from B nominal bearing width, nominal dimension deviation of an actual dimension from the nominal dimension variation of an actual dimension (algebraic difference between the largest and the smallest individual value of a dime
30、nsion) 3.3 Subscripts m s p s min smallest individual value Smax largest individual value Example: arithmetic mean of actual values (mean) actual value of single measurement (single) related to measurements in one single radial plane (plane) Admp deviation of the arithmetic mean obtained from measur
31、ements in a single plane from the nominal bore diameter. 4 Methods for the checking and measurement of rolling bearing components 4.1 Two point measurement with precision dial indicator in accordance with subclause 2.3.2.1, setting by means of gauge blocks in accordance with subclause 2.3.1 or in ac
32、cordance with setting standard, measuring arrangement in accordance with figures 1 and 2. The measurements shall be carried out in various radial planes. Minimum and maximum values shall be deter- mined in each of these planes. Measured values: dps maxi 4s min or Dps max; Dps min The minimum and max
33、imum values obtained from the measurements in any one single plane shall be used to calculate the deviation of an actual value from the Measurement of diameters on cylindrical surfaces (bore diameters, outside diameters) nominal value and to calculate the variations. First of all, the following valu
34、es shall be calculated from the measured va I ues : dps mu +dpr min. Dps max +Dps min Dmp= dmp = 9 2 Q Figure 1. Figure 2. 4.1 .I Mean diameter deviation, Adrnp or ADrnp (see DIN IS0 1132 *), subclauses 4.1.8 and 4.2.8) Admp=dmp-d; Abp=Dmp-D 4.1.2 Diameter variation in a single radial plane, vdp or
35、VD, (see DIN IS0 1132 *), subclauses 4.1.9 and 4.2.9) vdp =dps max - dps ; VD = Dps mm - Dps 4.1.3 Mean diameter variation, Vdmp or VDmp (see DIN IS0 I132 *),subclauses4.1.10and4.2.10) Vdmp = dmp max - dmp min VD, = Dmp max - Dmp mm The maximum and minimum mean diameters which can be ascertained wit
36、hin the measurement zone on a ring must differ by an amount not exceeding Vdmp or VD at the very most. 4.1.4 Deviation of the single diameter, Ads or A, (see DIN IS0 1 132 *I, subclauses 4.1.3 and 4.2.3) Ads = ds - d; ADS = D, - D Note: This tolerance is only indicated additionally in tolerance clas
37、s P2. 4.2 Measurement of the width Two point measurement with precision dial indicator in accordance with subclause 2.3.2.2, setting in accordance with setting standard, measuring arrangement in accord- ance with figure 3. 9 Figure 3. *) June 1982 edition Page 4 DIN 620 Part 1 The bearing ring shall
38、 be supported at three evenly spaced points, the precision dial indicator shall be arranged above one of the support points. Suitable stops shall be provided to centre the ring. The measurements shall be effected at arbitrarily selected angular positions of the ring; the maximum and mini- mum values
39、 ascertained during one complete revolution of the ring about its axis shall be recorded. Measured values: B,; Bsmh 4.2.1 Deviation of a single ring width, AB (see DIN IS0 1132 “1, subclause 4.4.3) ABs = B, - B (see DIN IS0 1132 *),subclause 4.4.4) VB = Bs max - Bs min 4.2.2 Ring width variation, VB
40、, The procedure for checking the width dimension C is also the one described in subclause 4.2. The nominal bearing width T shall be measured in similar fashion, but with a measuring arrangement which differs from the one illustrated in figure 3. 4.3 Checking the ring chamfer dimension (see DIN IS0 1
41、132 *), subclauses 4.5.3 and 4.5.4) 4.3.1 Checking with the aid GO end for chamfer radii in accordance with DIN 620 Part 6, rl s min and r2 smin NOT GO end in accordance with DIN 620 Part 6, rl smax and r2 s max 4.3.2 Checking instructions Place the limit gauge against the edge of the bearing ring a
42、nd observe the light gap. Local flaws can be ignored. 4.4 Measurement of the position of the bearing ring faces in relation to one another 4.4.1 Wall thickness variation of the single ring (radial bearing) Ki inner ring raceway to bore thickness variation K, outer ring raceway to outside surface thi
43、ckness variation (see DIN IS0 1132 “1, subclauses 5.6.1 and 5.6.2) of a double ended limit gauge Two point measurement with precision dial indicator in accordance with subclause 2.3.2.1, measuring arrange- ment in accordance with figure 4. o Figure 4. The difference between the largest and the small
44、est deflection of the precision dial indicator needle which is ascertained during one complete revolution of the ring rotated about its axis in the measuring device must not exceed Ki or K, respectively. 4.4.2 Washer thickness variation (thrust bearing) Si washer raceway to back face thickness varia
45、tion (shaft washer) Se washer raceway to back face thickness variation (housing washer) (see DIN IS0 1132 *), subclause 5.6.3) Two point measurement with precision dial indicator in accordance with subclause 2.3.2.1, measuring arrange ment in accordance with figure 5. a) Figure 5. b) The difference
46、between the largest and the smallest deflection of the precision dial indicator needle which is ascertained during one complete revolution of the washer rotated about its axis in the measuring device must not exceed Si or Se. 4.4.3 Face runout with bore, Sd (see DIN IS0 1132 *),subclause 5.3.1) Prec
47、ision dial indicator in accordance with sub- clause 2.3.2.1, measuring arrangement in accordance with figure 6. “1 June 1982 edition DIN 620 Part 1 Page 5 J Figure 6. Measuring device: Center cradle with plug gauge, conicity of the plug gauge 0,Ol to 0,02 mm per 100 mm length. Slip the inner ring on
48、to the plug gauge and let it rotate, set the precision dial indicator to the mean diameter of the end face of the inner ring.) The difference between the largest and the smallest deflection of the precision dial indicator needle ascertained during one complete revolution of the ring about its axis m
49、ust not exceed Sd. 4.4.4 Variation of outside surface generatrix inclination with face, S, (see DIN IS0 1132 *),subclause 5.5.1) Precision dial indicator in accordance with sub. clause 2.3.2.1, device in accordance with figure 7. Place the outer ring on the measuring device, reference face downwards. The difference between the largest and the smallest deflection of the precision dial indicator needle ascertained during one complete revolution of the outer ring about its axis must not exceed S,. 4.4.5 Raceway parallelism with face (radial bearing with corresponding raceway pr
