1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 180-6:1982 ISO6315:1980 Brake linings Part 6: Method for assessment of seizureto ferrous mating surface due tocorrosion ISO title: Road vehicles Brake linings Seizure to ferrous mating surface due to corrosion Test procedure UDC 629.11-597.6:620.1BSAU180-6:19
2、82 This BritishStandard, having been prepared under the directionof the Automobile Standards Committee, was published under the authority ofthe Board of BSI and comesintoeffect on 31March1982 BSI02-2000 The following BSI references relate to the work on this standard: Committee reference AUE/11 Draf
3、t for comment78/80971DC ISBN 0 580 12537 8 National foreword This BritishStandard has been prepared under the direction of the Automobile Standards Committee and is identical with ISO6315:1980 “Road vehicles Brake linings Seizure to ferrous mating surface due to corrosion Testprocedure” published by
4、 the International Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a BritishStandard without deviation. Some terminology and certain conventions are not identical with those used in BritishSt
5、andards; attention is especially drawn to the following. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards ar
6、e responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and 2 and a back cover. This standard has been updated (see c
7、opyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBSAU180-6:1982 BSI 02-2000 i Contents Page National foreword Inside front cover 0 Introduction 1 1 Scop
8、e and field of application 1 2 Test apparatus 1 3 Sampling and preparation 1 4 Test procedure 1 5 Test report 2ii blankBSAU180-6:1982 BSI 02-2000 1 0 Introduction Vehicles operating in wet weather may be parked with brakes “on” for considerable periods. The wet conditions are conducive to corrosion
9、which may result in a bond forming between lining and mating surface. If of sufficient strength, the bond may be intact after brake release thus restraining the road wheels. 1 Scope and field of application This International Standard specifies a laboratory method for conditioning brake linings in a
10、n environment that will promote corrosion, and a test method to assess the strength of bond formed by corrosion. For comparison of lining behaviours, it is essential that the material and condition of ferrous mating surfaces be constant and repeatable. This International Standard applies to drum bra
11、ke linings and disc brake pads fitted to the brakes of road vehicles. They may be tested in new or used condition. 2 Test apparatus The required apparatus shall consist of: 2.1 for drum brakes, a means such as screws and torque wrench, by which the shoes with linings may be maintained in contact wit
12、h the drum at a known pressure; 2.2 for drum brake linings, an axle, to which the drum may be locked and about which a lever which connects fairly with a brake shoe may rotate. A means for measuring force applied to the lever is required; 2.3 for disc brake pads, a means such as dead weight or clamp
13、, for maintaining pad and disc in contact at a known pressure; 2.4 for disc brake pads, a table, to which a disc may be clamped and a measurable force applied fairly to a radial edge of a pad; 2.5 a humidity chamber large enough to accept drums and discs; 2.6 water absorbent paper, free of clays, di
14、atomaceous earth, etc., and containing no chemicals that could affect rusting behaviour. 3 Sampling and preparation 3.1 New components 3.1.1 Drum brakes Six representative full size linings, or parts of such linings (width equal to shoe width, with maximum of80mm, and length equal to lining sample w
15、idth), two shoes and one drum are required. When linings are assembled to shoes, the assemblies shall be ground to a radius that will ensure full area contact with the drum braking path. The contacting surfaces of the linings and drum shall be clean, free from dust and of condition and finish that a
16、re representative of normal manufacturing standards. 3.1.2 Disc brakes Six representative pads and one disc are required. Pad and disc contact surfaces must be flat. The contacting surfaces of the pads and disc shall be clean, free from dust and of condition and finish that are representative of nor
17、mal manufacturing standards. 3.2 Used components Care must be exercised when removing components from a vehicle to avoid damage or contamination. The components shall be marked before removal so that they may be reassembled in the same relative positions during test. Components may be tested with th
18、eir working surfaces as removed from the vehicle, or the friction material surfaces may be lightly rubbed with grit paper and the iron surfaces rubbed with grit paper and cleaned with petroleum-ether. 4 Test procedure In testing new components, the same procedure is to be carried out for the six sam
19、ples. Set the humidity chamber controls to provide a relative humidity of952% at50 3 C. Place the linings or pads to be tested in the chamber in a position that ensures full exposure of the working faces for a period of4h. Place the test drum or disc in the same cabinet for1/2h, timed so that exposu
20、re is completed at the same time as the friction materials. In the case of linings and drums, remove them from the chamber, remove surface droplets of moisture with water absorbant paper, and assemble the two shoes in the drum using the clamping device to give a projected unit pressure of500kPa. Exe
21、rcise care to avoid rubbing the surfaces when removing surplus moisture. In the case of pads and disc, after removal of surface moisture with water absorbant paper, locate the pads on the disc and hold in position under a pressure of2500kPa. Place the assemblies in the humidity chamber for a further
22、16h under the same conditions.BSAU180-6:1982 2 BSI 02-2000 After exposure in the cabinet, remove the assemblies without dismantling and allow to airdry in normal room atmosphere(20 C/65% relative humidity) for48h. Place the assemblies in their respective test rigs and remove the clamping devices car
23、efully so that the test samples are not jarred or disturbed. Apply a steadily increasing force in the same direction as would be performed by the mating part of the brake, i.e.radially for disc brakes and tangentially for drum brakes, until the pad slips on the disc or the lining and shoe slide on t
24、he drum inner surface. Record the force at which slip occurs and its position applied. 5 Test report The test report should include the following particulars: a) size and quality of linings or pads; b) number of samples tested; c) condition of friction material (new or used, natural or prepared); d)
25、 type and size of drum or disc; new or used, natural or prepared; e) mean value and range of torque or force required for all samples to slide relative to the counter surfaces.blankBS AU 180-6:1982 ISO6315:1980 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the indepe
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