1、 Reference number ISO 3548-2:2009(E) ISO 2009INTERNATIONAL STANDARD ISO 3548-2 First edition 2009-08-15 Plain bearings Thin-walled half bearings with or without flange Part 2: Measurement of wall thickness and flange thickness Paliers lisses Demi-coussinets minces collerette ou sans collerette Parti
2、e 2: Mesurage de lpaisseur de paroi et de lpaisseur de collerette ISO 3548-2:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are license
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7、d ii ISO 2009 All rights reservedISO 3548-2:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Symbols and units.2 5 Purpose of checking .2 6 Checking methods 3 6.1 Measuring principle.3 6.2 Line measurement around the circ
8、umference .3 6.3 Line measurement in the axial direction.4 6.4 Point measurement .5 6.5 Grading of bearings 6 6.6 Eccentric bore6 7 Requirements for measuring equipment and specimen for the contact method.6 7.1 Radius for measuring the outside surface .6 7.2 Radius for measuring the inside surface6
9、7.3 Measuring pin load7 7.4 Set-up7 7.5 Periodic checking7 7.6 Failures on the inside and/or outside surface7 8 Checking of measuring equipment .7 Bibliography8 ISO 3548-2:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federati
10、on 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
11、. 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 w
12、ith 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 appr
13、oval 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 3548-2 was prepared by Technical Commi
14、ttee ISO/TC 123, Plain bearings, Subcommittee SC 5, Quality analysis and assurance. Together with ISO 3547-7, this part of ISO 3548 replaces ISO 12306, which has been cancelled. ISO 3548 consists of the following parts, under the general title Plain bearings Thin-walled half bearings with or without
15、 flange: Part 2: Measurement of wall thickness and flange thickness Tolerances, design features and methods of test is to form the subject of a part 1 of ISO 3548 1)and the measurement of peripheral length is to form the subject of a part 3. 1) It is intended to replace ISO 3548:1999 with ISO 3548-1
16、. INTERNATIONAL STANDARD ISO 3548-2:2009(E) ISO 2009 All rights reserved 1Plain bearings Thin-walled half bearings with or without flange Part 2: Measurement of wall thickness and flange thickness 1 Scope This part of ISO 3548 specifies, in accordance with ISO 12301, the checking of the wall-thickne
17、ss of thin- walled half bearings with or without flange and describes the required checking methods and measuring equipment. It applies to a maximum bearing diameter of 150 mm. If this part of ISO 3548 is applied to a greater diameter, an agreement can be formulated between the supplier and the user
18、. 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) applies. ISO 3548, Plain bearings
19、 Thin-walled half bearings with or without flange Tolerances, design features and methods of test ISO 12301, Plain bearings Quality control techniques and inspection of geometrical and material quality characteristics 3 Terms and definitions For the purposes of this document, the following terms and
20、 definitions apply. 3.1 wall thickness s 3radial distance between the opposing measuring points at the inside and the outside surface diameter See Figure 1. Figure 1 Wall thickness, s 3 , of a half bearing ISO 3548-2:2009(E) 2 ISO 2009 All rights reserved3.2 measuring point measuring line agreed poi
21、nts lines established to facilitate agreement on checking NOTE The establishment of measuring points lines does not preclude the need to comply with dimensional specifications in other areas. 3.3 tolerance range between the upper specified limit and the lower specified limit 3.4 uncertainty of measu
22、rement deviation of the measured value from the real value caused by statistical or systemic factors 4 Symbols and units For the purposes of this part of ISO 3548, the symbols and units are as given in Table 1. Table 1 Symbols and units Symbol Parameter Unit a chDistance to measuring position mm a 1
23、Distance to measuring position, rectangular from parting line mm 2Angle to measuring position from parting line grad B Width mm C iInner chamfer width mm D nNominal outside diameter mm e BEccentricity mm F pinMeasuring pin load N H Distance to measuring position from bearing parting line mm s aWall
24、thickness at angle 2mm s 3Wall thickness mm u Wall thickness reduction at angle 2mm x 1Centre point of nominal outside diameter mm x 2Centre point of eccentric bore mm 5 Purpose of checking In order to ensure the required bearing clearance and consequently the operational efficiency of the plain bea
25、ring unit, the wall thickness tolerances shall be as specified in ISO 3548. ISO 3548-2:2009(E) ISO 2009 All rights reserved 36 Checking methods 6.1 Measuring principle The gauging axis of the measuring device shall be in the radial direction and at a right angle to the outside surface of the test pi
26、ece in order to find the minimum value of the wall thickness, s 3 . The measured values may be recorded by a single measurement or by a sum of measurements (see Figure 2). a) Single measurement by contact (mechanical/electronic gauge) b) Sum measurement by contact/non-contact (electronic/pneumatic g
27、auge) Figure 2 Measuring principle of wall thickness measurement The presence of lubricating holes, oil pockets, oil grooves, markings or special chamfers may require deviation from the measuring lines and measuring points specified in this clause and shall be agreed upon separately. If any wall thi
28、ckness does not conform to the specified values due to the manufacturing process, because of deformation of the bearing backing in the area of marking or at non-load bearing places, that wall thickness shall be defined separately. 6.2 Line measurement around the circumference Measurement of the wall
29、 thickness around the circumference shall be carried out at the measuring lines specified in Figure 3 and Table 2. Key C iinner chamfer width aMeasuring lines, M. Figure 3 Position of measuring lines ISO 3548-2:2009(E) 4 ISO 2009 All rights reservedTable 2 Distance to measuring position a chWidth Di
30、stance to measuring position B a chNumber of measuring lines M B u 15 B/2 C i1 15 50 6 2 6.3 Line measurement in the axial direction Measurement of the wall thickness in the axial direction shall be carried out using the definition of measuring lines specified in Figure 4 a) (Method A) or using the
31、definition of measuring lines specified in Figure 4 b) and Table 3 (Method B). The position of measuring lines for bearings 150 mm nominal outside diameter is subject to agreement between the manufacturer and the customer. a) Method A b) Method B Key aMeasuring lines, M. Figure 4 Position of measuri
32、ng lines Table 3 Distance to measuring position Nominal outside diameter Radius for measuring inside surface D nmm mm 25 D nu 40 6 H u 8 40 D nu 90 9 u H u 13 90 D nu 120 H = 13 120 D nu 150 H = 20 ISO 3548-2:2009(E) ISO 2009 All rights reserved 56.4 Point measurement Point-by-point measurement of w
33、all thickness shall be carried out by using the definition of measuring points specified in Figure 5 or Figure 6 a) (Method A) or Figure 6 b) and Table 3 (Method B) for widths of B u 90 mm. In the case of B 90 mm, the measurement method shall be subject to agreement between the manufacturer and the
34、customer. The measuring position distance, a ch , shall be taken from Table 2. Key P measuring point Figure 5 One- or two-point measuring scheme for half bearings a) Method A b) Method B Key P measuring point Where the bearing design requires variable wall thickness, the measuring points shall be as
35、 specified on drawings. Figure 6 Three- or six-point measuring scheme for half bearings ISO 3548-2:2009(E) 6 ISO 2009 All rights reserved6.5 Grading of bearings Grading is in all cases (whether circumference, line or point measurement) carried out by referral to the measuring points in the crown. Wh
36、en measuring two points or lines in the crown, grading is carried out using the highest reading. 6.6 Eccentric bore In special applications, bearings with and without flange may be used with an eccentric bore. This means that wall thickness changes continuously from the crown to the parting line (se
37、e Figure 7). Measuring lines or points are defined by the angle a 2or the distance a 1(for Method A) or H (for Method B). If there is no other definition given, a 2= 25 . Key aMeasuring point 2. Figure 7 Eccentric bore and changing wall thickness from crown to parting line 7 Requirements for measuri
38、ng equipment and specimen for the contact method 7.1 Radius for measuring the outside surface The radius at the gauge measuring pin positioned on the outside surface shall be 3,0 mm 0,2 mm. 7.2 Radius for measuring the inside surface The radius at the gauge measuring pin positioned on the inside sur
39、face is given in Table 4 as a function of the plain bearing outside diameter, D n , and the lining material. Table 4 Radius for measuring the inside surface Radius for measuring inside surface mm Nominal outside diameter D nmm Metallic lining material Plastic lining material D nu 10 1,5 0,2 1,5 0,2
40、10 D nu 25 3 0,2 3 0,2 25 D nu 150 3 0,2 5 0,2 ISO 3548-2:2009(E) ISO 2009 All rights reserved 77.3 Measuring pin load The measuring pin load, F pin , applied to the lining material shall be 0,8 N to 2,5 N in accordance with ISO 12301. Load should be adapted to the hardness of the lining material (e
41、.g. for soft sliding overlays, use low load). 7.4 Set-up The measuring device shall be set to the nominal value of the thickness by a master block. 7.5 Periodic checking The measuring device shall be checked periodically with the master block from the set-up. 7.6 Failures on the inside and/or outsid
42、e surface The presence of grease, dirt, burrs, etc., or damage or deformation on the outside surface can influence the measurement. Therefore, these influences shall be eliminated by cleaning the bearing before measurement, if necessary. Any slight hollows on the outside surface shall be excluded fr
43、om measurement, if these areas are process related and agreed on between the manufacturer and the customer. A slight amount of corrosion protection may be allowed, as long as it does not influence the measurement. 8 Checking of measuring equipment The equipment used for measuring shall be checked fo
44、r accuracy of measurement at a frequency specified by the user, based on the type of equipment and on the experience gained from previous checks. The limits shall comply with current industry requirements. ISO 3548-2:2009(E) 8 ISO 2009 All rights reservedBibliography 1 ISO 286-1 2) , Geometrical pro
45、duct specifications (GPS) ISO code system for tolerances of linear sizes Part 1: Basis of tolerances, deviations and fits 2 ISO 286-2, ISO system of limits and fits Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts 3 ISO/R 1938, ISO system of limits and fits Part II: Inspection of plain workpieces 2) To be published. (Revision of ISO 286-1:1998) ISO 3548-2:2009(E) ICS 21.100.10 Price based on 8 pages ISO 2009 All rights reserved
