1、DRAFT FOR DEVELOPMENT DD ISO/PAS 22574:2007 Road vehicles Brake linings frictions materials Visual inspection ICS 43.040.40 DD ISO/PAS 22574:2007 This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 28 February 2007 BSI 2007 ISBN 978 0 580 50
2、173 9 National foreword This Draft for Development was published by BSI. It is the UK implementation of ISO/PAS 22574:2007. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature. It should b
3、e applied on this provisional basis, so that information and experience of its practical application can be obtained. A PAS is a Technical Specification not fulfilling the requirements for a standard, but made available to the public and established in an organization operating under a given procedu
4、re. A review of this Draft for Development will be carried out not later than 3 years after its publication. Notification of the start of the review period, with a request for the submission of comments from users of this Draft for Development, will be made in an announcement in the appropriate issu
5、e of Update Standards. According to the replies received, the responsible BSI Committee will judge whether the validity of the PAS should be extended for a further 3 years or what other action should be taken and pass their comments on to the relevant international committee. Observations which it i
6、s felt should receive attention before the official call for comments will be welcomed. These should be sent to the Secretary of the responsible BSI Technical Committee at British Standards House, 389 Chiswick High Road, London W4 4AL. The UK participation in its preparation was entrusted to Technic
7、al Committee AUE/11, Braking systems. A list of organizations represented on AUE/11 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Amendments issued since publica
8、tion Amd. No. Date Comments Reference number ISO/PAS 22574:2007(E)PUBLICLY AVAILABLE SPECIFICATION ISO/PAS 22574 First edition 2007-02-01 Road vehicles Brake linings frictions materials Visual inspection Vhicules routiers Matriaux de friction des garnitures de freins Inspection visuelle DD ISO/PAS 2
9、2574:2007ii iii Contents Page Foreword. v Introduction . vi 1 Scope . 1 2 Characteristic features for friction materials. 1 2.1 Characteristic features for disc brake pads. 1 2.1.1 Gapping (between material and plate) 1 2.1.2 Edge chipping . 2 2.1.3 Splits 2 2.1.4 Minor splits 3 2.1.5 Plucked and in
10、dented spigots. 3 2.1.6 Poor consolidated spigot holes 4 2.1.7 Excess adhesive on plate 4 2.1.8 Material flash on plate 5 2.1.9 Abrasive coating. 5 2.1.10 Anti-noise coating runs 6 2.1.11 Skin crazing. 6 2.1.12 Underlayer distribution 7 2.1.13 Marking 7 2.1.14 Unground material surface 8 2.1.15 Pain
11、t on friction material surface 8 2.1.16 Surface blisters . 9 2.1.17 Surface indentations 9 2.1.18 Grinding marks on friction material surface 10 2.1.19 Higher porosity area. 10 2.1.20 Poorly consolidated friction material . 11 2.1.21 Surface contamination with foreign matter . 11 2.1.22 Surface cont
12、amination with similar friction material 12 2.1.23 Friction surface structure 12 2.2 Characteristic features for drum brake linings 13 2.2.1 Chipped edges/corners 13 2.2.2 Edge splits. 14 2.2.3 Drill hole chipping at lining ends 14 2.2.4 Drill hole burrs inside the surface. 15 2.2.5 Drill hole burrs
13、 outside the surface 16 2.2.6 Cracks radiating from the rivet hole . 16 2.2.7 Paint on surface Lining for riveting and bonding 17 2.2.8 Surface cracks 17 2.2.9 Marking 18 2.2.10 Moulding skin on inside radius surface Linings for bonding and riveting 18 2.2.11 Moulding skin on outside radius surface
14、linings for riveting or bonding . 19 2.2.12 Surface blisters . 19 2.2.13 Surface grind marks . 20 2.2.14 Pitted surface (plucked surface) . 20 2.2.15 Surface structure 21 2.2.16 Poor consolidation . 21 2.2.17 Inside surface indentations . 22 2.2.18 Outside surface indentations 22 2.2.19 Concentratio
15、n of self contained ingredients unless typical of the formulation 23 2.2.20 High porosity area 24 2.2.21 Metal wire or plastic reinforcement 25 2.2.22 Foreign matter friction surface inclusion. 26 DD ISO/PAS 22574:2007iv 2.3 Characteristics features for bonded lined shoes 26 2.3.1 Lining overhang on
16、 shoe platform edge 26 2.3.2 Faulty shoes 27 2.3.3 Restricted lever movement 27 2.3.4 Stencilled information 28 2.3.5 Excess adhesive exudation over shoe platform edges 28 2.3.6 Excess adhesive exudation from lining ends 29 2.3.7 Excess primer 29 2.3.8 Lining surface condition 30 2.3.9 Gaps between
17、linings and shoe platform. 32 DD ISO/PAS 22574:2007 v 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.
18、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 Internat
19、ional 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 Stand
20、ards 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. In other circumstances, particularly when there is an urgent market requirement for such documents
21、, a technical committee may decide to publish other types of normative document: an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an ISO working group and is accepted for publication if it is approved by more than 50 % of the members of the paren
22、t committee casting a vote; an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a vote. An ISO/PAS or ISO/TS is reviewed after three years in orde
23、r to decide whether it will be confirmed for a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an International Standard or be wit
24、hdrawn. 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/PAS 22574 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 2
25、, Braking systems and equipment. DD ISO/PAS 22574:2007vi Introduction This Publicly Available Specification is based on the “Catalogue of characteristic features for friction materials” of the “FEMFM-Federation of European Manufacturers of Friction Materials” issued the first time in 1980. The FEMFM
26、 is a European organization of national associations formed by companies engaged in the development and production of friction materials of various product forms. The description of the characteristic features and their design was reviewed in 1996 when technological processes, especially safety aspe
27、cts and the demands made by the brake and automobile industry, were given careful consideration. DD ISO/PAS 22574:2007 1 Road vehicles Brake linings frictions materials Visual inspection 1 Scope Friction linings are composite materials with complex structure. Due to their composition and their produ
28、ction process, visual appearance characteristics can occur which in a precisely defined design are to be regarded as specific to the product. This International Standard defines visual aspect for the identification and assessment of such product characteristics in quality assurance, as well as a bas
29、is for commercial and technical agreements. The sequence of the product characteristics represents no order of priority. The brake linings are inspected in the “as supplied” condition, meaning unused. In some characteristic features, there are differences between brake linings with an effective lini
30、ng pad surface 120 cm 2and W 120 cm 2 . The acceptance criteria within the International Standard do not allow any characteristics which could impair the function and performance of brake linings and are applied unless there are other agreements between the customer and the supplier. 2 Characteristi
31、c features for friction materials 2.1 Characteristic features for disc brake pads 2.1.1 Gapping (between material and plate) The gap shown in Figure 1 is not acceptable. Figure 1 Gapping (between material and plate) DD ISO/PAS 22574:20072 2.1.2 Edge chipping In the case of a disc brake pad with a su
32、rface less than 120 cm 2a maximum of 1 % of the edge may chip. In the case of a disc brake pad with a surface equal or more than 120 cm 2a maximum of 0,5 % of the edge may chip. Figure 2 Edge chipping 2.1.3 Splits Splits having a length of more than 30 mm or more than 10 mm on corners or deeper than
33、 1,5 mm shall not be accepted (see Figure 3). Figure 3 Splits DD ISO/PAS 22574:2007 3 2.1.4 Minor splits Splits having a length of less than 30 mm or less than 10 mm on corners or with a depth les than 1,5 mm may be accepted (see Figure 4). Figure 4 Minor splits 2.1.5 Plucked and indented spigots Th
34、e disc brake pad shown in Figure 5 is acceptable on each spigot up to 50 % of area and 0,5 mm deep. NOTE This definition also applies where spigots have been physically indented in the pad design. Figure 5 Plucked and indented spigots DD ISO/PAS 22574:20074 2.1.6 Poor consolidated spigot holes The d
35、isc brake pad shown in Figure 6 is acceptable if only one spigot is affected with up to 20 % of the volume being low density. This definition also applies where spigots have been physically indented in the pad design. Figure 6 Poor consolidated spigot holes 2.1.7 Excess adhesive on plate Excess adhe
36、sive on plate is acceptable provided the fitment of the part is not affected. (See Figure 5.) Figure 7 Excess adhesive on the plate DD ISO/PAS 22574:2007 5 2.1.8 Material flash on plate A material flash on plate is acceptable up to 1mm thick outside functional zones. Flash shall be secured to back p
37、late. (See Figure 8.) Figure 8 Material flash on plate 2.1.9 Abrasive coating The disc brake pad is acceptable if at least 90 % of the surface is coated. (See Figure 9.) Figure 9 Abrasive coating DD ISO/PAS 22574:20076 2.1.10 Anti-noise coating runs The anti-noise coating runs is acceptable provided
38、 fitment of part is not affected. (See Figure 10.) Figure 10 Anti-noise coating runs 2.1.11 Skin crazing Skin crazing as shown in Figure 11 is acceptable. Figure 11 Skin crazing DD ISO/PAS 22574:2007 7 2.1.12 Underlayer distribution Presence of underlayer is acceptable on pad surface up to 2 % of ar
39、ea, if the distribution is according to the specification. (See Figure 12.) Figure 12 Under-layer distribution 2.1.13 Marking The marking shall be clear and legible. Figure 13 Marking DD ISO/PAS 22574:20078 2.1.14 Unground material surface An unground material surface equal or less than 10 % of the
40、area is acceptable provided flatness and parallelism tolerances are not exceeded. (See Figure 14.) Figure 14 Unground material surface 2.1.15 Paint on friction material surface Paint on friction material surface is acceptable up to 10 % of the surface area. (See Figure 15.) Figure 15 Paint on fricti
41、on material surface DD ISO/PAS 22574:2007 9 2.1.16 Surface blisters Surface blisters are acceptable if no surface lift is detectable. (See Figure 16.) Figure 16 Surface blisters 2.1.17 Surface indentations Surface indentations are acceptable up to 2 % of the surface in total, but a single indentatio
42、n shall not exceed 1 % of the material surface; (See Figure 17.) Figure 17 Surface indentations DD ISO/PAS 22574:200710 2.1.18 Grinding marks on friction material surface Grinding marks on friction material surface are acceptable. (See Figure 18.) Figure 18 Grinding marks on friction material surfac
43、e 2.1.19 Higher porosity area In the case of an effective material surface of less than 120 cm 2a maximum of 5 % surface area with a higher porosity is acceptable, provided the material contours are not affected. The percentage of allowable higher porosity shall be equal or less than 2 % in the case
44、 of an effective material surface equal or more than 120 cm 2 . (See Figure 19.) Figure 19 Higher porosity area DD ISO/PAS 22574:2007 11 2.1.20 Poorly consolidated friction material In the case of an effective material surface of less than 120 cm 2a maximum of 1 % surface area with poorly consolidat
45、ed friction material is acceptable. The percentage of poor consolidation shall be equal or less than 0,5 % in the case of an effective lining surface equal or more than 120 cm 2 . (See Figure 20.) Figure 20 Poorly consolidated friction material 2.1.21 Surface contamination with foreign matter Such a
46、 contamination is not acceptable. (See Figure 21.) Figure 21 Surface contamination foreign matter DD ISO/PAS 22574:200712 2.1.22 Surface contamination with similar friction material Spots on friction material with a surface equal or less than 1 % of the total surface are acceptable. Spots on frictio
47、n material with a surface equal or less than 2 % of the total surface are acceptable, only if the friction properties are not affected. 2.1.23 Friction surface structure In the case of an effective material surface of less than 120 cm 2the concentration of self contained ingredients is acceptable up
48、 to 5 % of the surface area but not continuous. In the case of an effective material surface equal or more than 120 cm 2the concentration of self contained ingredients is acceptable up to 3 % of the surface area but not continuous. (See Figure 22.) Non homogenous appearance is accepted for special q
49、ualities including surface plucking. (See Figure 23.) Figure 22 Friction surface structure Figure 23 DD ISO/PAS 22574:2007 13 2.2 Characteristic features for drum brake linings 2.2.1 Chipped edges/corners In the case of a lining surface of less than 120 cm 2chipped edges/corners are acceptable up to 10 mm 2and half the lining thickness. No more than 2 are allowed per lining. (See Figure 24.) In the case of a lining surface equal or
