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BS ISO 19259-2015

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BS ISO 19259-2015

BSI Standards Publication BS ISO 192592015 Plain bearings Bearings with embedded solid lubricantsBS ISO 192592015 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 192592015. The UK participation in its preparation was entrusted to Technical Committee MCE/12, Plain bearings. A list of organizations represented on this committee 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. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 85256 5 ICS 21.100.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2015. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO 192592015 ISO 2015 Plain bearings Bearings with embedded solid lubricants Paliers lisses Paliers avec lubrifiants solide incorpor INTERNATIONAL STANDARD ISO 19259 First edition 2015-10-01 Reference number ISO 192592015EBS ISO 192592015ISO 192592015Eii ISO 2015 – All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. 41 22 749 01 11 Fax 41 22 749 09 47 copyrightiso.org www.iso.orgBS ISO 192592015ISO 192592015EForeword iv 1 Scope . 1 2 Normative references 1 3 Characteristics 1 3.1 Structure . 1 3.2 Friction and wear characteristics . 2 3.3 Applicable field . 3 4 Material 4 4.1 Metallic base body 4 4.1.1 Copper alloy castings . 4 4.1.2 Grey cast irons . 4 4.2 Solid lubricant 5 4.3 Combination of metallic base body and solid lubricant 5 5 Dimensions . 6 6 Assembling . 9 7 Surfac e finish 9 Annex A informative Guide for selection of a bearing with embedded solid lubricants 10 Annex B informative Actual applications of a bearing with embedded solid lubricants .11 Bibliography .12 ISO 2015 – All rights reserved iii Contents PageBS ISO 192592015ISO 192592015E 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 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. 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 any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received see www.iso.org/patents. Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers to Trade TBT see the following URL Foreword - Supplementary information. The committee responsible for this document is ISO/TC 123, Plain bearings, Subcommittee SC 7, Special types of plain bearings.iv ISO 2015 – All rights reservedBS ISO 192592015INTERNATIONAL ST ANDARD ISO 192592015E Plain bearings Bearings with embedded solid lubricants 1 Scope This International Standard specifies a bearing with embedded solid lubricants which has been widely used as a solid lubricant bearing. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. ISO 185, Grey cast irons Classification 3 Characteristics 3.1 Structure A bearing with embedded solid lubricants is composed of a metallic base body supporting a load and a solid lubricant embedded in holes or hollows formed on the surface of the metallic base body giving lubricity. As to the embedded state of a solid lubricant, there is a plug type and a spiral type refer to Figure 1. As for hole type, there are “through” or perforated ones and “bottomed” ones refer to Figure 2. This International Standard specifies a type which is most common and has been widely used where a solid lubricant of a plug type is embedded in through holes. The International Standard also specifies a cylindrical bush and a flanged bush refer to Figure 3. a Plug type b Spiral type Figure 1 Embedded state of solid lubricants on cylindrical bush ISO 2015 – All rights reserved 1BS ISO 192592015ISO 192592015E a Through hole type b Bottomed hole type Key 1 metallic base body 2 hole 3 solid lubricant plug Figure 2 Structure of cross section on a bearing with embedded solid lubricants a Cylindrical bush b Flanged bush Figure 3 Overview of a bearing with embedded solid lubricants plug type 3.2 Friction and wear characteristics A bearing with embedded solid lubricants falls under the category of a solid lubricant bearing among self-lubricating bearings. In the solid lubricant bearings, there is a solid type, a coated type, a dispersed type, and an embedded type. A solid type is such where a solid lubricant powder is solidified using pitch, resin or the like as a binder. A coated type is such where a solid lubricant film is formed on a sliding surface by chemical or physical means such as coating, baking, chemical reaction, or the like. A dispersed type is such where a solid lubricant powder fine particles is dispersed into sintered metal matrix or the like.2 ISO 2015 – All rights reservedBS ISO 192592015ISO 192592015E An embedded type is such as mentioned above where holes or hollows are formed on a sliding surface of a metallic base body and solid lubricants are embedded therein and, since the load is supported by a metallic base body, this type has excellent load carrying capacity. The embedded solid lubricant supplies solid lubricant to the sliding surface and, when it slides on the mating member, the solid lubricant is properly drawn out and spread over both sliding surfaces whereupon a solid lubricant film is formed. Further, even when the film is broken, the embedded solid lubricant is drawn out by friction onto the sliding surfaces, so it repairs the film on the sliding surfaces whereby the lubrication is made possible for long periods and long life is achieved refer to Figure 4. Since the types of metallic base body and solid lubricant can be appropriately selected depending upon the operating conditions, a wide range of applications is possible. Moreover, bearings ranging from small to large sizes can be manufactured. 1 2 3 4 A Key 1 metallic base body 2 mating member 3 embedded solid lubricant 4 solid lubricant film A sliding direction Figure 4 Lubricating mechanism of a bearing with embedded solid lubricants 3.3 A pplicable field The bearing can be used for rotational motion, reciprocating motion, oscillating motion, and frequent start/stop cycles. The bearing is also used in such applications where no fluid lubrication can be expected because of high load and low speed operation, and where the environment temperature is high. Principally, the bearing can be used without supplying oil or grease. However, depending upon the actual operating conditions, oil or grease may be supplied for a purpose of enhancement of durability, removal of wear particulate or dust, and prevention of corrosion of the mating member. ISO 2015 – All rights reserved 3BS ISO 192592015ISO 192592015E 4 Material 4.1 Metallic base body Principal materials used as a metallic base body in which the solid lubricant is embedded include high strength cast brass, cast bronze, cast aluminium bronze, and grey cast iron. 4.1.1 Copper alloy castings Chemical compositions of copper alloy castings used as the metallic base body are shown in Table 1. Table 1 Chemical composition of copper alloy castings for a bearing with embedded solid lubricants Chemical element Chemical composition mass fraction, High strength brass CuZn25Al6Mn4Fe3 Bronze I CuSn10Zn2 Bronze II CuPb5Sn5Zn5 Aluminium bronze CuAl10Fe5Ni5 Components Cu 60,0 to 65,0 86,5 to 89,5 83,0 to 87,0 78,0 to 85,0 Sn 9,0 to 11,0 4,0 to 6,0 Pb 4,0 to 6,0 Zn 22,0 to 28,0 1,0 to 3,0 4,0 to 6,0 Fe 2,0 to 4,0 3,0 to 6,0 Ni 3,0 to 6,0 Al 5,0 to 7,5 8,5 to 10,5 Mn 2,5 to 5,0 0,1 to 1,5 Impurity Sn ≤0,2 ≤0,1 Pb ≤0,2 ≤1,0 ≤0,1 Zn ≤0,5 Fe ≤0,2 ≤0,3 Sb ≤0,2 ≤0,2 Ni ≤0,5 ≤1,0 ≤1,0 P ≤0,05 a ≤0,05 a Al ≤0,01 ≤0,01 Si ≤0,1 ≤0,01 ≤0,01 aFor permanent mould castings, centrifugal castings using mould and continuous castings, phosphorus content shall be 0,5 maximum. 4.1.2 Grey cast irons Grey cast irons used as the metallic base body should conform to ISO 185.4 ISO 2015 – All rights reservedBS ISO 192592015ISO 192592015E 4.2 Solid lubricant Table 2 shows outlines of the application and the operating temperature of solid lubricants of a graphite-base type and a fluororesin-base type which are representative ones of the solid lubricant to be embedded in the metallic base body. Besides those, there are sulfide-base type such as molybdenum disulfide and tungsten disulfide used under special and extreme circumstances. Each of them is used as sole component or as a mixed component with other additives. The additives compounded with each of those types are specified by manufacturers. Table 2 Types of solid lubricants and their applications Type Applications Operating temperature C Graphite-base General-purpose use High temperature use −40 to 400 Fluororesin-base General-purpose use Underwater use −40 to 80 Generally, a solid lubricant plug is formed in such a manner that the solid lubricant powder comprising the single component or the multiple components is moulded by heating under pressure, for example, by means of injection moulding. The resulting solid lubricant plugs are generally fixed with adhesive into holes in a cylindrical part of the metallic base body. In some cases, they are fixed by means of press fitting. They may also be fixed by injecting a solid lubricant composition having fluidity into a hole, followed by a solidification process. 4.3 Combination of metallic base body and solid lubricant Since various selections are available for a combination of a metallic base body and a solid lubricant, it is possible to cope with very wide range of applications. It is important that the metallic base body and the solid lubricant combination are selected to suit the operating conditions. It is also necessary to consider the pattern of the solid lubricant holes on the sliding surface depending upon the motion mode and the environmental conditions. Table 3 shows a typical combination of metallic base body and solid lubricant together with their applications. Further, a guide for the selection of bearings and examples of actual applications of a bearing with embedded solid lubricants are shown in Figure A.1 and in Table B.1. Table 3 Typical combination of metallic base body and solid lubricant Metallic base body Solid lubricants Applications High-strength brass Graphite-base General use for average conditions Applicable for high load Fluororesin-base In freshwater Bronze Graphite-base Conformability with mating member Medium load Aluminium bronze Graphite-base High temperature Medium load Fluororesin-base In seawater Grey cast iron Graphite-base High temperature Low load ISO 2015 – All rights reserved 5BS ISO 192592015ISO 192592015E 5 Dimensions The wall thickness of the bearing with embedded solid lubricants cannot be too thin or the solid lubricant will not be firmly held. So an appropriate thickness is necessary. Figure 5 shows cylindrical and flanged bushes. Table 4 shows the preferred nominal dimensions of inside and outside diameters and bush width for cylindrical bushes. Table 5 shows the preferred nominal dimensions for flanged bushes, including flange diameter and flange thickness. Both Table 4 and Table 5 are based on a metallic base body made of high strength cast brass and graphite-based solid lubricant plugs. Other material combinations with a metallic base body and solid lubricant plugs shall also be in accordance with Table 4 and Table 5. Bearings of sizes outside those shown in Table 4 and Table 5 shall be subject to agreement between the supplier and the user.   D D B D D D   B B a Cylindrical bush b Flanged bush Key x surface roughness F i g u r e 5 C y l i n d r i c a l a n d f l a n g e d b u sh6 ISO 2015 – All rights reservedBS ISO 192592015ISO 192592015E Table 4 Preferred nominal dimensions for cylindrical bushes Dimensions in millimetres Inside diameter Di Outside diameter Do Width B   8 12 8 10 12 10 14 8 10 12 15 12 18 8 10 12 15 13 19 10 12 15 20 14 20 10 12 15 20 15 21 10 12 15 20 16 22 10 12 15 20 25 18 24 10 12 15 20 25 20 28 10 12 15 20 25 30 20 30 10 12 15 20 25 30 22 32 12 15 20 25 30 25 33 12 15 20 25 30 35 25 35 12 15 20 25 30 35 28 38 15 20 25 30 35 40 30 38 15 20 25 30 35 40 30 40 15 20 25 30 35 40 32 42 15 20 25 30 35 40 35 45 20 25 30 35 40 50 40 50 20 25 30 35 40 50 60 40 55 20 25 30 35 40 50 60 45 55 25 30 35 40 50 60 70 45 60 25 30 35 40 50 60 70 50 60 30 35 40 50 60 70 80 50 65 30 35 40 50 60 70 80 55 70 30 35 40 50 60 70 80 60 75 30 35 40 50 60 70 80 65 80 35 40 50 60 70 80 70 85 35 40 50 60 70 80 100 70 90 35 40 50 60 70 80 100 75 90 40 50 60 70 80 100 75 95 40 50 60 70 80 100 80 100 40 50 60 70 80 100 120 90 110 50 60 70 80 90 100 120 100 120 50 60 70 80 90 100 120

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