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1、 Reference number ISO 3408-3:2006(E) ISO 2006 INTERNATIONAL STANDARD ISO 3408-3 Second edition 2006-06-15 Ball screws Part 3: Acceptance conditions and acceptance tests Vis billes Partie 3: Conditions et essais de rception Copyright International Organization for Standardization Provided by IHS unde
2、r license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/16/2007 09:07:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3408-3:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be
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5、e is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
6、or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47
7、 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/16/2007 09:07:41 MDTNo reproduction or networking permitt
8、ed without license from IHS -,-,- ISO 3408-3:2006(E) ISO 2006 All rights reserved iii Contents 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 Gener
9、al. 6 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 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/16/
10、2007 09:07:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3408-3:2006(E) iv ISO 2006 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepari
11、ng 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 and non-governmental, in lia
12、ison 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 Directives, Part 2. The main task of
13、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 casting a vote. Attention is
14、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 edition cancels and replaces
15、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 conditions and acceptance tests Part
16、 4: Static axial rigidity Part 5: Static and dynamic axial load ratings and operational lifetime Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/16/2007 09:07:41 MDTNo reproduction or networking permitte
17、d without license from IHS -,-,- INTERNATIONAL STANDARD ISO 3408-3:2006(E) ISO 2006 All rights reserved 1 Ball screws Part 3: Acceptance conditions and acceptance tests 1 Scope This part of ISO 3408 specifies the technical acceptance conditions for ball screws (see Figure 1) and, in particular, the
18、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 following referenced documents are indispensab
19、le 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: Geometric accuracy of machines operating under
20、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 purposes of this document, the terms an
21、d definitions given in ISO 3408-1 apply. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/16/2007 09:07:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3408-3:2006(E) 2 IS
22、O 2006 All rights reserved 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 tolerance grades Standard tolerance grade 0 Standard tolerance grade 1 Standard
23、 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 the useful travel, lu (tests E 1.1 and E 1.2), are taken directly from
24、ISO 286-2:1988, Table 1. Values of ep for 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 lu were evaluated using the following equations: Grade 0: vup = 0,0035
25、u l + 2,4 Grade 1: vup = 0,0045 u l + 4,6 Grade 3: vup = 0,009 u l + 9,2 Grade 5: vup = 0,018 u l + 18,4 where u l is the geometrical mean, in millimetres, of the extreme lengths of each step of measured travel given in Table A.1: uu maxu min lll= Run-out tolerance and orientation tolerances were de
26、termined 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 and quick and recommended as an approximation method suitable fo
27、r everyday evaluation may be used. NOTE The travel variation, vua, resulting from the mathematical method may not be the minimum travel variation. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/16/2007
28、09:07:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3408-3:2006(E) ISO 2006 All rights reserved 3 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 a eab
29、=+ with 2 2 iiiii iii ee a n = and 2 iiii iii nee b n = where ea is 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); i is the angle of rotation (specified or nominal travel, as app
30、ropriate) corresponding to the ith measuring point; ei is the travel deviation (or travel) in relation to the specified or nominal travel for the angel of rotation (or travel) corresponding to the ith measuring point; n is the number of measuring points. 4.2.2.3 Graphical method see Figure 3 a) and
31、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 repeat this procedure for the lower peaks (l3, .); b) determine the largest respect
32、ive deviations (e1, e2, e3, .) parallel to the ordinate, and select from these the smallest deviation (e2 in the example); c) draw a straight line through this point of minimum deviation that is parallel to the corresponding peak line (l2 parallel to l2 in the example). The actual mean travel deviat
33、ion, ea, is the centreline between these parallel lines (l2 and l2). The bandwidth within the useful travel, vua, is the distance between these parallel lines, e2, measured parallel to the ordinate. Copyright International Organization for Standardization Provided by IHS under license with ISO Licen
34、see=Aramco HQ/9980755100 Not for Resale, 04/16/2007 09:07:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3408-3:2006(E) 4 ISO 2006 All rights reserved Key 1 ball screw shaft 2 ball 3 ball nut Figure 1 Ball screw Key 1 ball nut 2 angular measuring instrument (permiss
35、ible 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 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9
36、980755100 Not for Resale, 04/16/2007 09:07:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3408-3:2006(E) ISO 2006 All rights reserved 5 a) Deviation esa related to specified travel ls b) Deviation e0a related to nominal travel l0 NOTE For the excess travel, see Tabl
37、e A.3. a Travel deviation. Figure 3 Determination of the actual mean travel deviation, esa or e0a Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/16/2007 09:07:41 MDTNo reproduction or networking permitt
38、ed without license from IHS -,-,- ISO 3408-3:2006(E) 6 ISO 2006 All rights reserved 5 Acceptance tests 5.1 General The typical tolerance 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 scre
39、w 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 measuring principle is illustrated in Figure 2. Table 3 Travel deviation te
40、sts Type of ball screw Positioning Transport Travel deviations per reference length Test Travel compensation c for useful travel lu Specified by user C = 0 Tolerance on specified travel ep E 1.1 E 1.2 Permissible travel variation vup within useful travel E 2 Permissible travel variation v300p within
41、 300 mm travel E 3 E 3 Permissible travel variation v2p within 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 ball by touching the ball track of a non- rotating ball screw shaft. For
42、the measuring intervals, see Table A.2. The travel variation v2 within 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), provided that this has been the subject of special agreement. Copy
43、right International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/16/2007 09:07:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3408-3:2006(E) ISO 2006 All rights reserved 7 5.2 Travel deviati
44、on and variation Object: Positioning ball screw E 1.1 Checking of the mean travel deviations, esa and e0a, within the useful travel, lu: a) for the specified travel, ls; b) for the nominal travel, l0. Diagram a Actual travel deviation. Permissible deviations Useful travel lu mm Tolerance on specifie
45、d travel ep m 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 1 600 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 00
46、0 5 000 76 140 5 000 6 300 170 Observations and remarks a) esa = _ m b) The travel compensation c shall be specified by the user c = _ e0a = _ m Measuring instruments See Figure 2. Test instructions See Figure 2. Copyright International Organization for Standardization Provided by IHS under license
47、with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/16/2007 09:07:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3408-3:2006(E) 8 ISO 2006 All rights reserved Object: Transport ball screw E 1.2 Checking of the mean travel deviation e0a, within the useful travel, lu: Diagram a Actual travel deviation. Permissible deviations Tolerance on specified travel ep m Stand