1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2006 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AS81936 REV. A AEROSPACE STANDARD Issued 1998-05 Revised 2006-06 Superseding AS81936 (R) Bearings, Plain, Self-Aligning (Cu-Be Ball, CRES Race) General Specification For FSC 3120 RATIONALE This document has been revi
5、sed to update references to current specifications and standards; to update references to the qualifying activity; to aid users by including reference to requirement paragraphs in Qualification Tests table; to revise Quality Conformance requirements to account for the cancellation of MIL-STD-105; to
6、 incorporate packaging requirements adopted by the ACBG; and to clarify figures.” NOTICE Under Department of Defense Policies and Procedures, any qualification requirements and associated qualified products lists are mandatory for DoD contracts. Any material relating to Qualified Products Lists (QPL
7、s) has not been adopted by SAE and is not part of this SAE technical document. 1. SCOPE 1.1 Scope This SAE Aerospace Standard (AS) covers airframe plain spherical bearings utilizing a copper-beryllium ball and corrosion resistant steel outer race for use between -65 F and +350 F. 2. APPLICABLE DOCUM
8、ENTS The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this
9、document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA
10、 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AS81936/1 Bearing, Plain, Self-Aligning, Cu-Be Ball CRES Race (With Staking Groove) -65F to +350F AS81936/2 Bearing, Plain, Self-Aligning, Cu-Be Ball, CRES Race, -65F to +350F AMS 2759 Heat Treatment o
11、f Steel Parts, General Requirements Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS81936 Revision A - 2 - 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, West C
12、onshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM D 3951 Standard Practice for Commercial Packaging ASTM E 18 Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials (DoD adopted) 2.3 ASME Publications Available from American Society of Mechanical Engineers, 22 Law
13、Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org. ASME B46.1 Surface Texture (Surface Roughness, Waviness, and Lay) ASME Y14.24 Types and Applications of Engineering Drawings ASME Y14.34M Associated Lists ASME Y14.35M Revision of Engineering Drawings and Associated Doc
14、uments ASME Y14.100 Engineering Drawing Practices 2.4 U.S. Government Publications Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/. MIL-DTL-197 Bearing, Anti
15、-friction, Associated Parts, and Subassemblies, Packaging of MIL-PRF-81322 Grease, Aircraft, General Purpose, Wide Temperature Range MIL-STD-129 Military Marking for Shipment and Storage MIL-STD-130 Identification Marking of U.S. Military Property MIL-STD-2073 Standard Practice for Military Packagin
16、g 3. REQUIREMENTS 3.1 Qualification The bearings furnished under this document shall be products which are authorized by the qualifying activity for listing on the applicable Qualified Products List (QPL-AS81936) at the time set for opening of bids (see 4.3 and 6.3). 3.1.1 Product Design Change Any
17、change in product design or description shall be reported to the qualifying activity and shall require requalification of the product to an extent determined by the activity responsible for qualification. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction
18、 or networking permitted without license from IHS-,-,-SAE AS81936 Revision A - 3 - 3.1.2 AS Sheets The individual item requirements shall be as specified herein and in accordance with the applicable AS sheet. In the event of any conflict between the requirements of this document and the AS sheet, th
19、e latter shall govern. 3.1.3 Product Manufacture Except for the assembly operation, the manufacturer is permitted to sub-contract manufacturing operations without violating the requirements of 3.1.1. The assembly operation shall be performed in the plant listed on the Qualified Products List. 3.2 Ma
20、terials The ball and outer race shall be in accordance with AS81936/1 or AS81936/2. 3.3 Design Bearing design shall conform to that specified on AS81936/1 or AS81936/2. 3.4 Construction Except as otherwise specified, the details of the working parts shall be optional. The bearings shall not have loa
21、ding slots. 3.4.1 Dimensions and Tolerances Dimensions and tolerances shall be as specified on the applicable AS sheet. Dimensions not shown shall be at the option of the manufacturer. 3.4.2 Surface Texture Surface textures shall have a roughness height rating (RHR) in accordance with ASME B46.1 and
22、 not in excess of the values shown on the applicable AS sheet. 3.4.3 Lubrication The bearings shall be thoroughly cleaned and dried in accordance with MIL-DTL-197. The mating spherical surfaces lubricant groove and bore shall be coated with grease conforming to MIL-PRF-81322. The date of lubrication
23、, month and year, shall be marked on each bearing package. 3.4.4 Hardness The hardness shall be as specified on the applicable AS sheet. 3.4.5 Conformity The conformity between the ball and race shall be checked in accordance with 4.6.6. Measurements shall be taken at a minimum of six positions, thr
24、ee uniformily spaced positions on each side of the lubrication groove. Ten percent of the race width on each edge shall be excluded from measurement and in addition, for sizes -12 and greater, 5% of the race width on each side of the lubrication groove shall be excluded. Variation between measured v
25、alues shall not exceed 0.001 inch. Overforming within 10% of each side face (H/10) is not permitted. Underforming is not controlled. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS81936 Revisi
26、on A - 4 - 3.5 Performance 3.5.1 Radial Static Limit Load After the radial static load listed on the applicable AS sheet has been applied as specified in 4.6.1, the permanent set shall not exceed 0.0020 inch for sizes -4 through -12 and 0.0030 inch for sizes -13 through -24. 3.5.2 Axial Static Limit
27、 Load After the axial static limit load specified on the applicable AS sheet has been applied as specified in 4.6.2, the permanent set shall not exceed 0.0040 inch. 3.5.3 Ultimate Load No fracture of the ball or race or push-out of the ball shall occur when 1-1/2 times the radial or axial load speci
28、fied on the applicable AS sheet is applied, as specified in 4.6.1 and 4.6.2. 3.5.4 Dynamic Tests 3.5.4.1 Mode I Dynamic Test After completion of the mode I dynamic test, as specified in 4.6.3.1, the maximum wear shall not exceed the values shown in Table 1. The bearing shall not crack, gall or other
29、wise fail. TABLE 1 - MAXIMUM ALLOWABLE WEAR Dash No. Mode I Mode II -6 -12 -20 0.0010 0.0020 0.0032 0.0007 0.0012 0.0020 3.5.4.2 Mode II Dynamic Test After completion of the mode II dynamic test, as specified in 4.6.3.2, the maximum wear shall not exceed the values shown in Table 1. The bearing shal
30、l not crack, gall or otherwise fail. 3.5.5 Self-Alignment The bearing shall be self-aligning and shall permit the angular displacement specified on the applicable AS sheet. 3.5.6 Internal Play 3.5.6.1 Radial Play When tested in accordance with 4.6.4.1 the radial play shall not exceed 0.0010 inch. 3.
31、5.6.2 Axial Play When tested in accordance with 4.6.4.2 the axial play shall not exceed 0.0050 inch. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS81936 Revision A - 5 - 3.6 Interchangeabilit
32、y All parts having the same manufacturers part number shall be directly and completely interchangeable with each other with respect to installation and performance. The drawing number requirements of ASME Y14.100, ASME Y14.24, ASME Y14.35M, and ASME Y14.34M shall govern documentation of and changes
33、in the manufacturers part numbers. 3.7 Identification of Product Each bearing shall be permanently and legibly marked with the manufacturers CAGE code, manufacturers lot number, and Aerospace Standard part number as a minimum. Where practicable, identification shall appear on the side face of the ra
34、ce; otherwise identification shall appear on the periphery of the bearing outer race. Any additional marking is optional. Metal impression stamping is prohibited. 3.8 Workmanship The bearings shall be free of tool marks, chatter waves, grinding scratches, pits, cracks, burrs, rough or sharp edges or
35、 other defects, and shall not catch or bind when manually oscillated or misaligned. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection Unless otherwise specified in the contract or purchase order, the manufacturer is responsible for the performance of all inspection requirements (exam
36、inations and tests) as specified herein. Except as otherwise specified in the contract or order, the manufacturer may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the qualifying activity. The qualifying activi
37、ty reserves the right to perform any of the qualification inspections set forth in this document where such inspections are deemed necessary to ensure products and services conform to prescribed requirements. The procurement activity reserves the right to perform any of the quality conformance inspe
38、ctions set forth in this document where such inspections are deemed necessary to ensure products and services conform to prescribed requirements. 4.1.1 Responsibility for Compliance All items shall meet all requirements of Sections 3 and 5. The inspection set forth in this document shall become a pa
39、rt of the suppliers overall inspection system or quality program. The absence of any inspection requirements in this document or the AS sheets shall not relieve the supplier of the responsibility of ensuring that all products or supplies submitted to the customer for acceptance comply with all requi
40、rements of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the customer to accept defect
41、ive material. 4.2 Classification of Inspections The examination and testing of the bearings shall be classified as: a. Qualification inspection (4.3) b. Quality conformance inspection (4.4) 4.3 Qualification Inspection Qualification inspection shall include all of the tests specified in Table 2. Cop
42、yright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS81936 Revision A - 6 - TABLE 2 - QUALIFICATION TESTS Examinations and Tests Requirement Paragraph Test Paragraph Samples to be Tested 1/ Examination
43、 of product Radial static limit load Axial static limit load Mode I dynamic test Mode II dynamic test Conformity 3.2, 3.4.1, 3.4.2, 3.7, 3.8 3.5.1, 3.5.3 3.5.2, 3.5.3 3.5.4.1 3.5.4.2 3.4.5 4.5.1 4.6.1 4.6.2 4.6.3.1 4.6.3.2 4.6.6 5 3 3 3 3 2/ 3 1/ Sizes M81936/1-6, -12 and -20 only. 2/ At manufacture
44、rs option, the Mode II tests may be performed with M81936/1-6R, -12R and -20R Bearings. 4.3.1 Sampling Instructions Qualification test samples shall consist of twenty (20) bearings each of M81936/1-6, /1-12 and /1-20. In the event qualification is desired for only a part of the full series of bearin
45、gs, the manufacturer may request authorization to substitute three other bearing sizes for qualification testing. The three substitute sizes shall be selected by the activity responsible for qualification. All bearings necessary for test specified herein shall be furnished by the manufacturer and sh
46、all be representative of his normal production. Samples shall be identified as required and forwarded to the activity designated in the letter of authorization from the activity responsible for qualification (see 6.3). 4.3.2 Qualification Approval Qualification approval of the three sizes authorized
47、 will secure qualification approval of the remaining sizes for which qualification is desired. Qualification approval of an M81936/1 bearing will secure qualification approval of the M81936/1R, M81936/2 and M81936/2R bearings of the same bore size. 4.3.3 Certified Test Report The manufacturer shall
48、furnish a certified test report showing that the manufacturers product satisfactorily conforms to this document. The test report shall include, as a minimum, actual results of the tests specified herein including copies of the load versus deflection curves from the radial and axial static limit load tests. When the report is submitted, it shall be accompanied by a dated drawing which completely describes the manufacturers product by specifying all dimensions and tolerances, composition of the ball and outer race material, and heat treatment. The manufacturers part number for each s
