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1 Provläsningsexemplar / Preview SVENSK STANDARD SS-ISO :2006 Fastställd Utgåva 1 Verktygsmaskiner Kulskruvar Del 5: Axiella statiska och dynamiska belastningar och utslitningstid (ISO :2006, IDT) Ball screws Part 5: Static and dynamic axial load ratings and operational lifetime (ISO :2006, IDT) ICS Språk: engelska Publicerad: oktober 2006 Copyright SIS. Reproduction in any form without permission is prohibited.
2 Den internationella standarden ISO :2006 gäller som svensk standard. Detta dokument innehåller den officiella engelska versionen av ISO :2006. The International Standard ISO :2006 has the status of a Swedish Standard. This document contains the official English version of ISO :2006. Upplysningar om sakinnehållet i standarden lämnas av SIS, Swedish Standards Institute, telefon Standarder kan beställas hos SIS Förlag AB som även lämnar allmänna upplysningar om svensk och utländsk standard. Postadress: SIS Förlag AB, STOCKHOLM Telefon: Telefax: E-post: sis.sales@sis.se. Internet:
3 SS-ISO :2006 (E) Contents Page Foreword... iv 1 Scope Normative references Terms and definitions Symbols and subscripts Symbols Subscripts Basic axial load ratings Basic static axial load rating, C 0a Basic dynamic axial load rating, C a Modified axial load ratings Modified static axial load rating, C 0am General equation Correction for surface hardness, f h Correction for accuracy, f ac Modified dynamic axial load rating, C am General equation Correction for surface hardness, f h Correction for accuracy, f ac Influence of material melting process, f m Life Equivalent rotational speed and equivalent axial load General Ball screw with backlash between ball nut and screw shaft Ball screw with preloaded ball nuts on screw shaft Nominal life, L or L h Ball screw with backlash between ball nut and screw shaft Ball screw with preloaded ball nuts on screw shaft Resulting life, L r Nominal life, L ar or L har, with reliability factor, f ar (see Table 3) Modified life, L m or L hm Ball screw with backlash between ball nut and screw shaft Ball screw with preloaded ball nuts on screw shaft Modified resulting life, L mr Modified life, L mar or L hmar, with reliability factor, f ar (see Table 3) iii
4 SS-ISO :2006 (E) Provläsningsexemplar / Preview Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member 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 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 Directives, 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 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 was prepared by Technical Committee ISO/TC 39, Machine tools. 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 4: Static axial rigidity Part 5: Static and dynamic axial load ratings and operational life iv
5 SS-ISO :2006 (E) Ball screws Part 5: Static and dynamic axial load ratings and operational life 1 Scope This part of ISO 3408 specifies the calculation schemes for static and dynamic load ratings, and operational life, in order to obtain comparable values for the design and use of ball screws. NOTE The calculations have been based primarily on publications by Prof. G. Lundberg and A. Palmgren Acta Politechnica, mech. Eng. series Vol. I, No. 3, Stockholm, Sweden. Part 7, This part of ISO 3408 is applicable under the following preconditions: elastic deformation of ball and balltrack; hardness of balltrack basically exceeds a minimum of HRC 58; conformity f rs and f r n > 0,5; the quality of steel of which the ball screw is made is equivalent to that of ball bearing steel or similar steel alloys; optimum lubrification is always provided. 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 referenced document (including any amendments) ISO , Ball screws Part 1: Vocabulary and designation 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO apply. 1
6 SS-ISO :2006 (E) Provläsningsexemplar / Preview 4 Symbols and subscripts 4.1 Symbols Symbol Description Unit α Contact angle degrees, γ Geometry factor ϕ Lead angle degrees, ρ 11, ρ 12, ρ 21, ρ 22 Reciprocal curvature radii mm 1 l Axial ball / ball track deflection µm C a Basic dynamic axial load rating N C am Modified dynamic axial load rating N C i Dynamic axial load rating for the ball screw per single loaded turn N C n Dynamic axial load rating for the ball nut per single loaded turn N C s Dynamic axial load rating for the ball screw shaft per single loaded turn C 0a Basic static axial load rating N C 0am Modified static axial load rating N D pw Ball pitch circle diameter mm D w Ball diameter mm f ac Accuracy factor f ar Reliability factor f c Geometry factor f h Hardness factor for dynamic axial load rating f h0 Hardness factor for static axial load rating f m Material processing factor f op Operational preload factor N f r n Conformity factor of ball nut f rs Conformity factor of ball screw shaft f 1, f 2, f 3 Geometry factor F Axial load, force N F a Actual axial load N F lim Limit load at which contact between balls and ball tracks will be lost by operating load F m Equivalent axial load N F ma Equivalent actual axial load N N 2
7 SS-ISO :2006 (E) Symbol Description Unit F pr Preload N i Number of loaded turns k 0 Characteristic of basic static axial load rating L Life revolutions L ar Life with reliability factor revolutions L h Life h L har Life with reliability factor h L hm Modified life h L hmar Modified life with reliability factor h L m Modified life revolutions L mar Modified life with reliability factor revolutions L mr Modified resulting life revolutions L r Resulting life revolutions n Rotational speed min 1 n m Equivalent rotational speed min 1 P h Lead mm q Time % r n Ball track radius of ball nut mm r s Ball track radius of ball screw shaft mm z l Number of effectively loaded balls per turn z u Number of unloaded balls in the recirculation system where balls are recirculated after one turn 4.2 Subscripts Symbol Description j Number of loadings 1 Refers to load direction 1 2 Refers to load direction 2 (1) Refers to ball nut 1 (2) Refers to ball nut 2 3
8 SS-ISO : Basic axial load ratings 5.1 Basic static axial load rating, C 0a The basic axial load rating is calculated from the following equations: 2 0a 0 l sin w C = k z i α D cosϕ (1) Dpw π zl = z u cosϕ D w integer (2) ϕ P = arctan h D π pw (3) k0 = 27,74 ( ) ( ) w D ρ ρ ρ ρ (4) ρ 2 11 = ρ21 = (5) Dw ρ ρ 12 = 22 = 1 frs Dw cosα Dpw D cosα w 2 2 (6) (7) NOTE The calculation of the basic static axial load rating C 0a is based on a maximum deformation of 0,000 1 D w. 5.2 Basic dynamic axial load rating, C a In the case of optimal load distribution (parallel load directions in ball screw shaft and in ball nut), the basic dynamic axial load rating is derived from the following basic interrelations: where 0,86 Ca = Ci i (8) Ci 0,3 10 / 3 Cs = Cs 1+ Cn (9) with 2/3 1,8 ( cosα) tanα ( cosϕ) 0,86 1,3 Cs = fc zl Dw (10) 1 fc = 9,32 f1 f f rs 0,41 (11) 4
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