ISO 3548-2:2020

SLOVENSKI STANDARD
01-oktober-2021
Nadomešča:
SIST ISO 3548-2:2010
Drsni ležaji - Tankosteni polovični ležaji s prirobnico ali brez nje - 2. del: Merjenje
debelin stene in prirobnice
Plain bearings - Thin-walled half bearings with or without flange - Part 2: Measurement of
wall thickness and flange thickness
Paliers lisses - Demi-coussinets minces à ou sans collerette - Partie 2: Mesurage de
l'épaisseur de paroi et de l'épaisseur de collerette
Ta slovenski standard je istoveten z: ISO 3548-2:2020
ICS:
21.100.10 Drsni ležaji Plain bearings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 3548-2
Second edition
2020-09
Plain bearings — Thin-walled half
bearings with or without flange —
Part 2:
Measurement of wall thickness and
flange thickness
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definition . 1
4 Symbols and units . 2
5 Purpose of checking . 2
6 Checking methods . 3
6.1 Measuring principle of wall thickness . 3
6.2 Line measurement around the circumference . 3
6.3 Line measurement in axial direction . 4
6.4 Point measurement . 5
6.5 Grading of bearings . 7
6.6 Eccentric bore . 7
6.7 Measuring principle for flange thickness . 7
6.8 Measuring point for flange thickness . 7
7 Requirements for measuring equipment and specimen for the contact method.8
7.1 Tip-radius for measuring pin on the outside surface . 8
7.2 Tip-radius for measuring pin on the inside surface . 8
7.3 Measuring pin load . 8
7.4 Set-up . 8
7.5 Periodical control. 8
7.6 Measurement failures on the inside and/or outside surface . 9
8 Checking of measuring equipment . 9
Bibliography .10
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
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of
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on the ISO list of patent declarations received (see www .iso .org/ patents).
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expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 123, Plain Bearings, Subcommittee SC 5,
Quality analysis and assurance.
This second edition cancels and replaces the first edition (ISO 3548-2:2009), which has been technically
revised. The main changes compared to the previous edition are as follows:
— the term “flange thickness” has been introduced in Clause 3;
— Table 1 has been updated;
— several figures have been revised;
— a new Table 3 “Thin walled half bearings with flange — Distance to measuring position a ” has
ch
been introduced.
A list of all parts in the ISO 3548 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 3548-2:2020(E)
Plain bearings — Thin-walled half bearings with or
without flange —
Part 2:
Measurement of wall thickness and flange thickness
1 Scope
This document specifies in accordance with ISO 12301 the checking of the wall-thickness of thin-walled
half bearings with or without flange and describes the necessary checking methods and measuring
equipment.
It applies to a maximum bearing diameter of 150 mm. It can be applied to a bigger diameter, provided
that there is an agreement between the supplier and the user.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 3548-1, Plain bearings — Thin-walled half bearings with or without flange — Part 1: Tolerances, design
features and methods of test
3 Terms and definition
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
For the purposes of thisdocument, the following definitions apply:
3.1
wall thickness
s
radial distance between the opposing measuring points at the inner and outer cylindrical surfaces
Note 1 to entry: See Figure 1.
Figure 1 — Wall thickness, s , of a half bearing
3.2
measuring point
agreed point established to facilitate agreement on checking
Note 1 to entry: The establishment of measuring points (lines) does not preclude the need to comply with
dimensional specifications in other areas.
3.3
measuring line
agreed line established to facilitate agreement on checking
Note 1 to entry: The establishment of measuring lines does not preclude the need to comply with dimensional
specifications in other areas.
3.4
tolerance
range between the upper specified limit and the lower specified limit
3.5
flange thickness
axial distance between the opposing measuring points at the inside and the outside surface of flange
4 Symbols and units
For the purposes of this document, the symbols and units are those given in Table 1.
Table 1 — Symbols and units
Symbol Description Unit
a distance to measuring position mm
ch
a minimum height of transition mm
a radial distance to measuring position from flange outside edge mm
ch,fl
B width mm
B flange width mm
fl
C inner chamfer width mm
i
D nominal outside diameter mm
e eccentricity of bore centre to outside diameter centre mm
B
F measuring pin load N
pin
H distance to measuring position from bearing parting line mm
s wall thickness at angle α mm
a
s flange thickness mm
fl
s wall thickness at crown mm
u wall thickness reduction at angle α mm
x centre point of nominal outside diameter —
x centre point of eccentric bore —
α angle to measuring position °
α angle to measuring position from parting line °
M1, M2 measuring line —
5 Purpose of checking
In order to ensure the required bearing clearance, and consequently, the operational efficiency of the
plain bearing unit, keep to the wall thickness tolerances specified in ISO 3548-1.
2 © ISO 2020 – All rights reserved

6 Checking methods
6.1 Measuring principle of wall thickness
The gauging axis of the measuring device shall be in the radial direction and perpendicular to the
outside surface of the test piece in order to find the minimum value of the wall thickness. The measured
values may be recorded by a single measurement or by sum measurement, which are symbolically
represented in Figure 2.
a) Single wall thickness measurement by con- b) Sum wall thickness measurement by con-
tact (mechanical/electronic gauge) tact/non-contact (electronic/pneumatic gauge)
Figure 2 — Methods for recording the measured value
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 the following and shall be agreed
between the customer and the supplier.
Any wall thickness not conforming 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, shall be agreed
between the customer and the supplier.
6.2 Line measurement around the circumference
Measurement of the wall thickness around the circumference shall be carried out at the measuring
lines specified in Figure 3 and Tables 2 and 3.
a) Thin wall bearing without b) Thin wall bearing without c) Thin wall bearing with
flange, B < 15 mm flange B ≥ 15 mm flanges
Key
C inner chamfer width
i
a distance to measuring position
ch
a distance to measuring position for thin wall bearings with flanges
ch,fl
M1,M2measuring line
Figure 3 — Position of measuring lines
Table 2 — Thin-walled half bearings without flange — Distance to measuring position, a
ch
Width Distance to measuring position Number of measuring line
...