ISO/TC 123/SC 5 - Quality analysis and assurance

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.

This document specifies, following ISO 12301, the checking of the outside diameter of wrapped bushes (ISO 3547‑2:2017, methods A, B and D) and describes the necessary checking methods and measuring equipment. NOTE The dimensions and tolerances of wrapped bushes are given in ISO 3547‑1. Checking the wall thickness is the subject of ISO 3547‑7.

The document specifies, following ISO 12301, the checking of the inside diameter of wrapped bushes (see ISO 3547‑2:2017, method C) and describes the necessary checking methods and measuring equipment. NOTE 1 All dimensions in this document are given in millimetres except where otherwise noted/designated. NOTE 2 The dimensions and tolerances of wrapped bushes are given in ISO 3547‑1. NOTE 3 Checking of the wall thickness is the subject of ISO 3547‑7. NOTE 4 Checking of the outside diameter of wrapped bushes is the subject of ISO 3547‑5.

This document describes, following ISO 12301, the checking methods and measuring equipment used for measuring the total wall thickness of thin-walled bushes in the finished state. NOTE All dimensions in this document are given in millimetres.

ISO 12308:2017 defines the types of plain bearing samples exchanged between purchaser and manufacturer. In the field of internal combustion engines and other series production, it is necessary to work with different types of samples depending on the purpose. Types of samples are as follows. - Samples used for tests and examinations which are carried out in the experimental stage and pilot lot stage. These include fitting samples, prototype samples and intermediate samples. - Samples used to prove that the quality is in accordance with the quality requirements (dimensions, material and performance specification). These include initial samples and reference samples and, if necessary, intermediate samples. NOTE See ISO 3534 (all parts) and ISO 9000 for further information. - Samples which give selective information about particular quality characteristics of a plain bearing, relating to their conformity with the specifications. These involve reference and characteristic modification samples.

ISO 13778:2017 specifies the selective assembly of bearings (in accordance with ISO 3548‑1). The bearing diametral clearance is determined by the housing diameter, journal diameter and the wall thickness of the two half bearings. Typically, these components will have a total tolerance "stack up" of 50 µm to 60 µm. Current engine development and in particular, the desire for improved engine refinement, has provided a need to decrease the clearance range due to the tolerance "stack up". This document suggests various schemes of selective assembly to achieve such ranges.

ISO 12302:2017 specifies for plain bearings (except thick-walled half-bearings) those quality characteristics in accordance with ISO 12301 which can be used to regulate and control a production process on the basis of statistical process control (SPC). It covers dimensional variables but does not take account of attributes.

ISO 12132:2017 gives guidelines for the preparation of a Design FMEA for thin-walled half bearings used in machinery, e.g. internal combustion engines (the Process FMEA is the responsibility of the supplier). It lists the common potential failure mode(s), potential effect(s) and potential cause(s) of failure. The numerical evaluation of risks in terms of occurrence, severity and detection can be specific to each application, manufacturer and customer. Since they have to be assessed in each case, the numerical data are not included in this document. General guidance on statistical assessment can be obtained from the references.

This part of ISO 3548 specifies, according to ISO 12301, the checking of the peripheral length of thin-walled half bearings with or without flange, and describes the necessary checking methods and measuring equipment. Thin-walled half bearings are flexible and, in the free condition, do not conform to a cylindrical profile. This is one reason the peripheral length of the half bearings can only be measured under a constraining load by use of specialized measuring equipment. In addition, measuring equipment different from that illustrated in this part of ISO 3548 can be used, provided the measuring accuracy of the equipment is consistent with the specifications given in Clause 17. This part of ISO 3548 does not include measurement of the parting line taper. This part of ISO 3548 applies to thin-walled half bearings, the specifications of which are given in ISO 3548-1

ISO 12301:2007 specifies quality control techniques and inspection of the geometrical and material quality characteristics of the following types of plain bearings: thin-walled half-bearings with or without flange, as specified in ISO 3548; metallic thick-walled half-bearings (with and without flange) that are manufactured as halves but that are necessarily interchangeable and have the ratio s3 : Do > 0,11; wrapped bushes, as specified in ISO 3547; unsplit metallic bushes (with and without flange) made from solid and multilayer materials and with outside diameters up to 230 mm; solid polymer bushes (with and without flange) with inside diameters up to 200 mm; ring-type thrust washers and pressed bimetallic half-thrust washers, as specified in ISO 6525 and ISO 6526, respectively; and bushes made from sintered material, as specified in ISO 2795.

ISO 3548-2:2009 specifies, in accordance with ISO 12301, the checking of the wall-thickness 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 ISO 3548-2:2009 is applied to a greater diameter, an agreement can be formulated between the supplier and the user.

ISO 3547-6:2007 specifies, following ISO 12301, the checking of the inside diameter of wrapped bushes and describes the necessary checking methods and measuring equipment. Wrapped bushes in the free condition are flexible, but after insertion they adapt largely to the shape of the housing bore due to the interference between the outside diameter of the bush and the housing bore.

ISO 3547-5:2007 specifies, following ISO 12301, the checking of the outside diameter of wrapped bushes (ISO 3547-2:2006, methods A, B and D) and describes the necessary checking methods and measuring equipment. Wrapped bushes in the free condition are flexible, but after insertion they adapt largely to the shape of the housing bore due to the oversize between the outside diameter of the bush and the housing bore. For this reason, checking of the outside diameter of wrapped bushes can only be carried out under a constraining load by use of specialized measuring equipment.

ISO 3547:2007 describes, following ISO 12301, the checking methods and measuring equipment used for measuring the total wall thickness of thin-walled bushes in the finished state.

Contains some minor amendments.

Specifies, in accordance with ISO 12301, the checking of the outside diameter of wrapped bushes (methods A and B specified in ISO 3547) and describes the necessary checking methods and measuring equipment. Checking of the outside diameter of wrapped bushes can only be carried out under a constraining load by use of specialized measuring equipment. The dimensions and tolerances of wrapped bushes are given in ISO 3547. Checking the wall thickness is the subject of ISO 12306.

Describes in accordance with ISO 12301 the checking methods (line measurement around the circumference, line measurement in the axial direction, point measurement) and requirements for measuring equipment. Is not applicable to thermoplastic bushes.

Defines different types of plain bearing samples such as are exchanged between purchaser and manufacturer: samples used for tests and examinations which are carried out in the experimental stage and pilot lot stage; samples used to prove that the quality is in accordance with the quality requirements (dimensions, material and performance specification); samples which give selective information about particular quality characteristics.

Specifies for plain bearings (except thick-walled half-bearings) those quality characteristics in accordance with ISO 12301 which can be used to regulate and control a production process on the basis of statistical process control. Covers dimensional variables but does not take account of attributes.

Applies to metallic thin-walled half-bearings (ISO 3548), metallic thin-walled flanged bearings (ISO 6864), metallic thick-walled half-bearings (with and without flange), wrapped bushes (ISO 3547), unsplit metallic bushes (with and without flange) (ISO 4379), thermoplastic bushes (with and without flange), ring-type thrust washers and pressed bimetallic half-thrust washers (ISO 6525 and 6526), and plain bearings made from sintered material (ISO 2795). Annex A deals with calculation of tangential load.