1、April 2011 Translation by DIN-Sprachendienst.English price group 14No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、25.060.99!$nOR“1754447www.din.deDDIN ISO 3408-3Ball screws Part 3: Acceptance conditions and acceptance tests (ISO 3408-3:2006)English translation of DIN ISO 3408-3:2011-04Kugelgewindetriebe Teil 3: Abnahmebedingungen und Abnahmeprfungen (ISO 3408-3:2006)Englische bersetzung von DIN ISO 3408-3:2011-
3、04Vis billes Partie 3: Conditions et essais de rception (ISO 3408-3:2006)Traduction anglaise de DIN ISO 3408-3:2011-04SupersedesDIN 69051-3:1989-05www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.2903.11 A comma is used as the decim
4、al marker. Contents Page National foreword .3 National Annex NA (informative) Bibliography.4 1 Scope 5 2 Normative references 5 3 Terms and definitions5 4 Test conditions and permissible deviations.6 4.1 Classification6 4.2 Geometrical tests.6 5 Acceptance tests10 5.1 General10 5.2 Travel deviation
5、and variation11 5.3 Run-out and location tolerances16 5.4 Functional tests .26 Annex A (normative) Complementary tables28 DIN ISO 3408-3:2011-04 2 National foreword This standard has been prepared by Technical Committee ISO/TC 39 “Machine Tools”, Working Group WG 7 “Ball screws”. The responsible Ger
6、man body involved in its preparation was the Normenausschuss Werkzeugmaschinen (Machine Tools Standards Committee). ISO 3408 consists of the following parts, under the general title Ball screws: Part 1: Vocabulary and designation Part 2: Nominal diameters and nominal leads Metric series Part 3: Acce
7、ptance conditions and acceptance tests Part 4: Static axial rigidity Part 5: Static and dynamic axial load ratings and operational life The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 230-1 DIN ISO 230-1 ISO 286-2 DIN EN ISO 286-2 ISO 3
8、408-1 DIN ISO 3408-1 Amendments This standard differs from DIN 69051-3:1989-05 as follows: a) the standard has been editorially revised and restructured; b) terms and designations in Clauses 4 and 5 have been updated and harmonized with international specifications; c) in Clause 5 “Acceptance tests”
9、, tolerance grade 0 has been added; d) the following tests have been added in Clause 5: 1) measurement of radial run-out of bearing seat related to the centreline of the screw part; 2) measurement of radial run-out of the journal diameter related to the centreline of the bearing seat; 3) measurement
10、 of the axial run-out of the shaft faces related to the centreline of the screw shaft. Previous editions DIN 69051-3: 1989-05 DIN ISO 3408-3:2011-04 3 National Annex NA (informative) Bibliography DIN ISO 230-1, Machine tools Test code for machine tools Part 1: Geometric accuracy of machines operatin
11、g under no-load or finishing conditions DIN EN ISO 286-2, Geometrical product specifications (GPS) ISO code system for tolerances on linear sizes Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts DIN ISO 3408-1, Ball screws Part 1: Vocabulary and designation DIN
12、ISO 3408-3:2011-04 4 1 Scope This part of ISO 3408 specifies the technical acceptance conditions for ball screws (see Figure 1) and, in particular, the respective permissible deviations for the acceptance tests. NOTE The actual design need not necessarily correspond to that shown in Figure 1. The re
13、spective tests required will be agreed upon between the manufacturer and user. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the ref
14、erenced document (including any amendments) applies. ISO 230-1:1996, Test code for machine tools Part 1: Geometric accuracy of machines operating under no-load or finishing conditions ISO 286-2:1988, ISO system of limits and fits Part 2: Tables of standard tolerance grades and limit deviations for h
15、oles and shafts ISO 3408-1:2006, Ball screws Part 1: Vocabulary and designation 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 3408-1 apply. Ball screws Part 3: Acceptance conditions and acceptance tests DIN ISO 3408-3:2011-04 5 4 Test conditions an
16、d permissible deviations 4.1 Classification The tests are graded in six standard tolerance grades (see Table 1) in conformance with ISO 286-2:1988, Table 1. Table 1 Standard tolerance grades Standard tolerance grade 0 Standard tolerance grade 1 Standard tolerance grade 3 Standard tolerance grade 5 S
17、tandard tolerance grade 7 Standard tolerance grade 10 Increasing requirements on accuracy and function 4.2 Geometrical tests 4.2.1 Tolerances Tolerances on specified travel, ep, for the useful travel, lu(tests E 1.1 and E 1.2), are taken directly from ISO 286-2:1988, Table 1. Values of epfor useful
18、travel, lu, of greater than or equal to 3 150 mm were calculated be linear extrapolation (see Table A.1). Tolerances on travel variation, vup, in micrometres, within useful travel luwere evaluated using the following equations: Grade 0: vup = 0,0035 ul + 2,4 Grade 1: vup = 0,0045 ul + 4,6 Grade 3: v
19、up = 0,009 ul + 9,2 Grade 5: vup = 0,018 ul + 18,4 where ul is the geometrical mean, in millimetres, of the extreme lengths of each step of measured travel given in Table A.1: uumaxuminll l= Run-out tolerance and orientation tolerances were determined from experience. 4.2.2 Evaluation of the measuri
20、ng diagrams 4.2.2.1 General To evaluate the actual mean travel deviation within the useful travel, either a mathematical method precise by its nature or a graphical method simple and quick and recommended as an approximation method suitable for everyday evaluation may be used. NOTE The travel variat
21、ion, vua, resulting from the mathematical method may not be the minimum travel variation. DIN ISO 3408-3:2011-04 6 The graphical method gives the minimum travel variation. 4.2.2.2 Mathematical (least square) method The actual mean travel deviation, ea, is given by the formula aeab=+ with 22ii iiiiii
22、eean= and 2ii i iiiine ebn = where eais the actual mean travel deviation in relation to the specified or nominal travel, as appropriate; is the angle of rotation (specified or nominal travel, as appropriate); iis the angle of rotation (specified or nominal travel, as appropriate) corresponding to th
23、e ith measuring point; eiis the travel deviation (or travel) in relation to the specified or nominal travel for the angel of rotation (or travel) corresponding to the ithmeasuring point; n is the number of measuring points. 4.2.2.3 Graphical method see Figure 3 a) and b) The evaluation of the actual
24、 mean travel deviation from the travel deviation diagram is carried out as follows: a) draw the tangents to the actual travel deviation curve at two ore more upper peaks (l1, l2, .) and repeat this procedure for the lower peaks (l3, .); b) determine the largest respective deviations (e1, e2, e3, .)
25、parallel to the ordinate, and select from these the smallest deviation (e2in the example); c) draw a straight line through this point of minimum deviation that is parallel to the corresponding peak line (l2parallel to l2in the example). The actual mean travel deviation, ea, is the centreline between
26、 these parallel lines (l2and l2). The bandwidth within the useful travel, vua, is the distance between these parallel lines, e2, measured parallel to the ordinate. DIN ISO 3408-3:2011-04 7 Key 1 ball screw shaft 2 ball 3 ball nut Figure 1 Ball screw Key 1 ball nut 2 angular measuring instrument (per
27、missible error = 10”) 3 measuring slide 4 travel measuring instrument (permissible error = 1 m) 5 clamping device (e.g. chuck), drive 6 ball screw shaft Figure 2 Basic measuring principle DIN ISO 3408-3:2011-04 8 a) Deviation esarelated to specified travel lsb) Deviation e0arelated to nominal travel
28、 l0NOTE For the excess travel, see Table A.3. aTravel deviation. Figure 3 Determination of the actual mean travel deviation, esaor e0aDIN ISO 3408-3:2011-04 9 5 Acceptance tests 5.1 General The typical tolerance grades for positioning and transport ball screws are given in Table 2. Table 2 Typical t
29、olerance grades for positioning and transport ball screws Type of ball screw Standard tolerance grade Positioning 0 1 3 5 Transport 0 1 3 5 7 10 The test according to Table 3 shall apply, depending on the type of ball screw considered positioning (type P) or transport (type T) ball screw. The basic
30、measuring principle is illustrated in Figure 2. Table 3 Travel deviation tests Type of ball screw Positioning Transport Travel deviations per reference length Test Travel compensation c for useful travel luSpecified by user C = 0 Tolerance on specified travel epE 1.1 E 1.2 Permissible travel variati
31、on vupwithin useful travel E 2 Permissible travel variation v300pwithin 300 mm travel E 3 E 3 Permissible travel variation v2pwithin 2 rad E 4 Tests and tolerances to the ball nut displacement are relative to the ball screw shaft. A pitch-to-pitch measurement may be carried out using a measuring bal
32、l by touching the ball track of a non-rotating ball screw shaft. For the measuring intervals, see Table A.2. The travel variation v2within 2 rad is determined over nine measurements (8 45) per revolution, or continuously within one thread (at the start, in the middle and at the end of useful travel)
33、, provided that this has been the subject of special agreement. DIN ISO 3408-3:2011-04 10 5.2 Travel deviation and variation Object: Positioning ball screw E 1.1Checking of the mean travel deviations, esaand e0a, within the useful travel, lu: a) for the specified travel, ls; b) for the nominal trave
34、l, l0. Diagram aActual travel deviation. Permissible deviations Useful travel lumm Tolerance on specified travel epm Standard tolerance grade u 0 1 3 5 7 10 0 315 4 6 12 23 315 400 5 7 13 25 400 500 6 8 15 27 500 630 6 9 16 32 630 800 7 10 18 36 800 1 000 8 11 21 40 1 000 1 250 9 13 24 47 1 250 1 60
35、0 11 15 29 55 1 600 2 000 18 35 65 2 000 2 500 22 41 78 2 500 3 150 26 50 96 3 150 4 000 32 62 115 4 000 5 000 76 140 5 000 6 300 170 Observations and remarksa) esa= _ m b) The travel compensation c shall be specified by the user c = _ e0a= _ m Measuring instruments See Figure 2. Test instructions S
36、ee Figure 2. DIN ISO 3408-3:2011-04 11 Object: Transport ball screw E 1.2Checking of the mean travel deviation e0a, within the useful travel, lu: Diagram aActual travel deviation. Permissible deviations Tolerance on specified travel epm Standard tolerance grade 0 1 3 5 7 10 up 300p300lev= Observatio
37、ns and remarks e0a= _ m Measuring instruments See Figure 2. Test instructions See Figure 2. DIN ISO 3408-3:2011-04 12 Object: Positioning ball screw E 2 Checking of the travel variation vuwithin the useful travel, lu: Diagram aActual travel deviation. Permissible deviations Useful travel lumm Travel
38、 variation vupm Standard tolerance grade u 0 1 3 5 7 10 0 315 3,5 6 12 23 315 400 3,5 6 12 25 400 500 4 7 13 26 500 630 4 7 14 29 630 800 5 8 16 31 800 1 000 6 9 17 34 1 000 1 250 6 10 19 39 1 250 1 600 7 11 22 44 1 600 2 000 13 25 51 2 000 2 500 15 29 59 2 500 3 150 17 34 69 3 150 4 000 21 41 82 4
39、000 5 000 49 99 5 000 6 300 119 Observations and remarksvua= _ m Measuring instruments See Figure 2. Test instructions See Figure 2. vuais the smallest distance, measured parallel to the ordinate, between two lines parallel to the mean travel that envelop the actual travel deviation over the useful
40、travel lu. DIN ISO 3408-3:2011-04 13 Object: Positioning or transport ball screw E 3 Checking of the travel variation v300within an axial travel of 300 mm: Diagram a Actual travel deviation. Permissible deviations Standard tolerance grade 0 1 3 5 7 10 v300pm 3,5 6 12 23 52a210aaOnly for transport ba
41、ll screws.Observations and remarksv300a max= _ m Measuring instruments See Figure 2. Test instructions See Figure 2. v300ais the smallest distance, measured parallel to the ordinate, found when a template is moved along the actual travel deviation and parallel to the mean travel, which contains the
42、actual travel deviation over any 300 mm length along the useful travel. DIN ISO 3408-3:2011-04 14 Object: Positioning ball screw E 4 Checking of the travel variation v2pwithin 2 rad: Diagram aActual travel deviation. Permissible deviations Standard tolerance grade 0 1 3 5 7 10 v2pm 3 4 6 8 Observati
43、ons and remarks v2a max= _ m Measuring instruments See Figure 2. Test instructions See Figure 2. v2ais the smallest distance, measured parallel to the ordinate, found when a template is moved along the actual travel deviation and parallel to the mean travel, which contains the actual travel deviatio
44、n over any distance corresponding to one revolution, i.e. 2 rad along the useful travel. DIN ISO 3408-3:2011-04 15 5.3 Run-out and location tolerances Object: Transport or positioning ball screw E 5 Measurement of radial run-out, t5, of ball screw shaft outer diameter for ascertaining straightness r
45、elated to AA per length l5: Diagram Permissible deviations Standard tolerance grade Nominal diameter d0mm 0 1 3 5 7 10 u l5mm l5p, m, for l56 12 80 12 25 160 25 50 315 50 100 630 100 200 1 250 16 20 25 32 40 80 l1/d0 u l5max p, m, for l1 4l5 40 32 40 50 64 80 160 40 60 48 60 75 96 120 240 60 80 80 1
46、00 125 160 200 400 80 100 128 160 200 256 320 640 Observations and remarkst5a= _ m t5max a= _ m Measuring instruments Dial gauge and V-blocks Test instructions Reference to test code ISO 230-1:1996, 5.612.2 Place ball screw in identical V-blocks at points A and A. Set dial gauge with measuring shoe
47、at the distance l5perpendicular to the cylindrical surface. Rotate the ball screw slowly while recording the changes in the measurements at specified measuring intervals. NOTE 1 Optionally, measurement by supporting the ball screw shaft at both centres can be used by agreement. NOTE 2 If l1l to be valid t6.1au t6.1p6llDiagram Key 1 bearing seat Permissible deviations Standard tolerance grade Nominal diameter d0mm 1 3 5 7 10 u l mm t6.1p, m, for l 6 20 80 10 12 20 40 63 20 5
