1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58ICS 25.060.99Ball screws Part 3: Acceptance conditions and acceptance testsBRITISH STANDARDBS ISO34
2、08-3:2006BS ISO 3408-3:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2006 BSI 2006ISBN 0 580 48900 0The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue
3、under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct a
4、pplication. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 25 and a back cover.The BSI copyright notice displayed in this documen
5、t indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesenquiries on the interpretation, or proposals for change, and keep UK interests inf
6、ormed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard reproduces verbatim ISO 3408-3:2006 and implements it as the UK national standard.The UK participation in its preparation was entrusted to Technical Committee MTE/1, Ma
7、chine tools, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any Reference numberISO 3408-3:2006(E)INTERNATIONAL STANDARD ISO3408-3Second edition2006-06-15Ball screws Part 3: Acceptance conditions and acceptance tests
8、 Vis billes Partie 3: Conditions et essais de rception BS ISO 3408-3:2006ii iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Test conditions and permissible deviations 2 4.1 Classification. 2 4.2 Geometrical tests 2 5 Acceptance tests 6 5.1 General. 6
9、5.2 Travel deviation and variation . 7 5.3 Run-out and location tolerances. 12 5.4 Functional tests 22 Annex A (normative) Complementary tables 24 BS ISO 3408-3:2006iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member
10、 bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental
11、 and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directiv
12、es, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies
13、casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3408-3 was prepared by Technical Committee ISO/TC 39, Machine tools. This second
14、edition cancels and replaces the first edition (ISO 3408-3:1992), which has been technically revised. 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: Acceptance conditi
15、ons and acceptance tests Part 4: Static axial rigidity Part 5: Static and dynamic axial load ratings and operational lifetime BS ISO 3408-3:20061Ball screws Part 3: Acceptance conditions and acceptance tests 1 Scope This part of ISO 3408 specifies the technical acceptance conditions for ball screws
16、(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 respective tests required will be agreed upon between the manufacturer and user. 2 Normative references The followi
17、ng 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 referenced document (including any amendments) applies. ISO 230-1:1996, Test code for machine tools Part 1: Geometri
18、c 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 holes and shafts ISO 3408-1:2006, Ball screws Part 1: Vocabulary and designation 3 Terms and definitions For the p
19、urposes of this document, the terms and definitions given in ISO 3408-1 apply. BS ISO 3408-3:20062 4 Test conditions and 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 toleran
20、ce grades Standard tolerance grade 0 Standard tolerance grade 1 Standard tolerance grade 3 Standard tolerance grade 5 Standard 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
21、 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 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 l
22、uwere evaluated using the following equations: Grade 0: vup = 0,0035 ul + 2,4 Grade 1: vup = 0,0045 ul + 4,6 Grade 3: vup = 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: uumax
23、uminll l= Run-out tolerance and orientation tolerances were determined from experience. 4.2.2 Evaluation of the measuring 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 an
24、d quick and recommended as an approximation method suitable for everyday evaluation may be used. NOTE The travel variation, vua, resulting from the mathematical method may not be the minimum travel variation. BS ISO 3408-3:20063The graphical method gives the minimum travel variation. 4.2.2.2 Mathema
25、tical (least square) method The actual mean travel deviation, ea, is given by the formula aeab=+ with 22ii iiiiiieean= 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 tra
26、vel, as appropriate); iis the angle of rotation (specified or nominal travel, as appropriate) corresponding to the 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;
27、n is the number of measuring points. 4.2.2.3 Graphical method see Figure 3 a) and b) The evaluation of the actual 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 r
28、epeat this procedure for the lower peaks (l3, .); b) determine the largest respective deviations (e1, e2, e3, .) 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 correspo
29、nding peak line (l2parallel to l2in the example). The actual mean travel deviation, ea, is the centreline between 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. BS ISO 3408-3:20064 Key
30、 1 ball screw shaft 2 ball 3 ball nut Figure 1 Ball screw Key 1 ball nut 2 angular measuring instrument (permissible 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 BS I
31、SO 3408-3:20065a) Deviation esarelated to specified travel lsb) Deviation e0arelated to nominal travel l0NOTE For the excess travel, see Table A.3. aTravel deviation. Figure 3 Determination of the actual mean travel deviation, esaor e0aBS ISO 3408-3:20066 5 Acceptance tests 5.1 General The typical t
32、olerance grades for positioning and transport ball screws are given in Table 2. Table 2 Typical tolerance 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 th
33、e type of ball screw considered positioning (type P) or transport (type T) ball screw. The basic 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
34、 luSpecified by user C = 0 Tolerance on specified travel epE 1.1 E 1.2 Permissible travel variation 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 relati
35、ve to the ball screw shaft. A pitch-to-pitch measurement may be carried out using a measuring ball 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
36、, or continuously within one thread (at the start, in the middle and at the end of useful travel), provided that this has been the subject of special agreement. BS ISO 3408-3:200675.2 Travel deviation and variation Object: Positioning ball screw E 1.1Checking of the mean travel deviations, esaand e0
37、a, within the useful travel, lu: a) for the specified travel, ls; b) for the nominal travel, 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 5
38、00 630 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 1 600 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 sp
39、ecified by the user c = _ e0a= _ m Measuring instruments See Figure 2. Test instructions See Figure 2. BS ISO 3408-3:20068 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
40、specified travel epm Standard tolerance grade 0 1 3 5 7 10 up 300p300lev= Observations and remarks e0a= _ m Measuring instruments See Figure 2. Test instructions See Figure 2. BS ISO 3408-3:20069Object: Positioning ball screw E 2 Checking of the travel variation vuwithin the useful travel, lu: Diagr
41、am aActual travel deviation. Permissible deviations Useful travel lumm Travel 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 0
42、00 13 25 51 2 000 2 500 15 29 59 2 500 3 150 17 34 69 3 150 4 000 21 41 82 4 000 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
43、 to the mean travel that envelop the actual travel deviation over the useful travel lu. BS ISO 3408-3:200610 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 toler
44、ance grade 0 1 3 5 7 10 v300pm 3,5 6 12 23 52a210aaOnly for transport ball 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 actu
45、al travel deviation and parallel to the mean travel, which contains the actual travel deviation over any 300 mm length along the useful travel. BS ISO 3408-3:200611Object: Positioning ball screw E 4 Checking of the travel variation v2pwithin 2 rad: Diagram aActual travel deviation. Permissible devia
46、tions Standard tolerance grade 0 1 3 5 7 10 v2pm 3 4 6 8 Observations 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 para
47、llel to the mean travel, which contains the actual travel deviation over any distance corresponding to one revolution, i.e. 2 rad along the useful travel. BS ISO 3408-3:200612 5.3 Run-out and location tolerances Object: Transport or positioning ball screw E 5 Measurement of radial run-out, t5, of ba
48、ll screw shaft outer diameter for ascertaining straightness related 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 80 100 125 160 200 400 80 100 128 160 200 256 320 640 Observations and remarkst5a= _ m t5max a= _ m Measuring in
