1、ARP5448/6Issued 2002-05Plain Spherical Bearing Conformity ExaminationFOREWORDThe Airframe Control Bearing Group (ACBG-1) prepared this ARP as a conversion of draft military standard MIL-STD-2159-6 into SAE ARP document format.TABLE OF CONTENTS1. SCOPE .31.1 Purpose .31.2 Classification32. REFERENCES
2、 .32.1 Definitions33. GENERAL REQUIREMENTS.33.1 Test Apparatus.34. DETAILED REQUIREMENTS 34.1 Encapsulation 34.2 Sectioning54.3 Polishing 54.4 Inspection 5Reaffirmed 2010-06AEROSPACERECOMMENDEDPRACTICESAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the s
3、tate 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 therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five
4、years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2010 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electroni
5、c, 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) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your in
6、put. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/ARP5448/6Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE ARP5448/6- 2 -TABLE OF CONTENTS (Cont
7、inued)5. NOTES105.1 Intended Use105.2 Method of Reference .105.3 Test Data105.4 Disposition of Report105.5 Key Words .11FIGURE 1 Mounting Methods4FIGURE 2 Normal Conformity Type I Bearing .6FIGURE 3 Normal Conformity Type II Bearing 7FIGURE 4 Sectioning Bearing for Normal Conformity Inspection8FIGUR
8、E 5 Sectioning Bearing for Circumferential Conformity Inspection .8FIGURE 6 Circumferential Conformity Type II Bearing9Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE ARP5448/6- 3 -1. SCOPE:1.1 P
9、urpose:This method outlines a standard procedure for performing conformity tests of bearings utilizing liners of bonded polytetrafluoroethylene (PTFE). The data from these tests shall be used to determine if the product meets the conformity requirements of the applicable specification.1.2 Classifica
10、tion:Bearings covered by this test method shall be spherical bearings with either fabric or fabric composite liners containing PTFE (Type I), or with molded PTFE material (Type II).2. REFERENCES:There are no referenced publications specified herein.2.1 Definitions:CONFORMITY: The characteristic of a
11、 spherical bearing which describes the relationship between the spherical surface of the ball and the spherical inner surface of the race.3. GENERAL REQUIREMENTS:3.1 Test Apparatus:The following items shall be used for this examination.a. Self-setting, metallurgical mounting resin.b. Abrasive paper
12、(180, 240, 320, 400 and 600 grit sizes).c. Metal scribe.d. Optical comparator or toolmakers microscope.e. Metallurgical mounting mold.4. DETAILED REQUIREMENTS:4.1 Encapsulation:4.1.1 Material: Bearing assemblies to be sectioned shall be encapsulated in an appropriate plastic material, as used in met
13、allurgical mounts, to prevent motion of the ball in relation to the race.4.1.2 Mount Mold: Before mixing plastic mounting resin, center bearing in an appropriate size mount mold, which should be large enough such that the bearing will be approximately 50% enveloped in mounting compound. The mold and
14、 bearing shall be placed on a glass slab or equivalent hard flat surface (see Figure 1 Method A). It may be necessary to install some bearings in a retaining ring prior to mounting to eliminate a potential spring-back of the bearing race (see Figure 1 Method B).Copyright SAE International Provided b
15、y IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE ARP5448/6- 4 -FIGURE 1 - Mounting MethodsCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS
16、-,-,-SAE ARP5448/6- 5 -4.1.3 Setup: Bearings manufactured with radial looseness shall have an appropriate thickness of shim stock inserted between the ball and outer ring to force the ball radially against the outer ring at the point diametrically opposite the shim. The bearing shall then be encapsu
17、lated in plastic mounting material, sectioned along the diameter through the ball/race contact point, and inspected as above.4.1.4 Mounting Compound: Mix mounting compound in accordance with the manufacturers recommendation. The consistency of the compound shall be such that it flows smoothly, minim
18、izing the presence of air pockets or voids in the mount. Slowly pour resin into mold until bearing is covered as shown in Figure 1. Allow to stand undisturbed for the recommended cure time.4.2 Sectioning:4.2.1 Sectioning for Normal Conformity Inspection: The bearing shall be cut on a diameter and no
19、rmal to the race side faces to produce a surface as in Figure 2 for Type I spherical bearings, or as in Figure 3 for Type II spherical bearings. The bearings shall be flooded constantly with coolant to prevent mounting resin from softening. The mounted bearing shall be sectioned as shown in Figure 4
20、, allowing approximately 0.010 inches for final preparation. A sharp scribe point, or other pointed metal prick, shall be used to clean metal smear from race/ball interface caused by sawing.4.2.2 Sectioning for Circumferential Conformity Inspection: For Type II spherical bearings with molded PTFE ma
21、terial, the mounted bearings shall be sectioned as shown in Figure 5, allowing approximately 0.010 inches for final preparation. The bearing shall be cut on a diameter and parallel to the race side faces to produce a surface as shown in Figure 6. The bearing shall be flooded constantly with coolant
22、to prevent mounting resin from softening. A sharp scribe point, or other pointed metal prick, shall be used to clean metal smear from race/ball interface caused by sawing.4.3 Polishing:The bearing shall be rough sanded and polished to a true diameter to facilitate accurate measurement of the race/ba
23、ll interface.4.4 Inspection:4.4.1 Normal Conformity of Type I and Type II Spherical Bearings: By use of an optical comparator, toolmakers microscope, or other suitably accurate technique, measure dimension “t“ radially from the ball to the outer race as shown in Figures 2 or 3. The normal conformity
24、 must meet the applicable specification requirements. 4.4.2 Circumferential Conformity of Type II Spherical Bearings: By use of an optical comparator or other suitably accurate technique, measure dimension “” radially from the center of the bore at a minimum of eight uniformly spaced positions as sh
25、own in Figure 6. Circumferential conformity shall meet the applicable specification requirements.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE ARP5448/6- 6 -FIGURE 2 - Normal Conformity Type I
26、BearingCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE ARP5448/6- 7 -FIGURE 3 - Normal Conformity Type II BearingCopyright SAE International Provided by IHS under license with SAENot for ResaleNo
27、 reproduction or networking permitted without license from IHS-,-,-SAE ARP5448/6- 8 -FIGURE 4 - Sectioning Bearing for Normal Conformity InspectionFIGURE 5 - Sectioning Bearing for Circumferential Conformity InspectionCopyright SAE International Provided by IHS under license with SAENot for ResaleNo
28、 reproduction or networking permitted without license from IHS-,-,-SAE ARP5448/6- 9 -FIGURE 6 - Circumferential Conformity Type II BearingCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE ARP5448/6
29、- 10 -5. NOTES:5.1 Intended Use:This test method is intended to evaluate conformity of PTFE lined spherical bearings.5.2 Method of Reference:This test method shall be referenced in general and detailed specifications, standards, or drawings for plain spherical bearings. Specific test and data requir
30、ements are given in the applicable document. The following note shall be used to reference this test method:NOTE: The bearings shall be tested in accordance with SAE ARP5448/6. The slash number refers to the specific test method.5.3 Test Data:5.3.1 Test Records: Data sheets shall be in a format simi
31、lar to the sample test data sheets shown in Figures 2, 3, and 6.5.3.2 Test Report: The recorded data shall be summarized in report form and shall contain the following:a. Bearing description1. Part number and applicable specification.2. Lot identification.3. Manufacturer.4. A dated drawing completel
32、y describing the test bearing, including the dimensions, material and the rating.b. Measurement equipment1. Model number, serial number and accuracy.2. Calibration data.c. Data sheets1. List of measurements by location.2. A graphical representation of the applicable measurement locations.d. Results
33、of all inspections. This includes approval or rejection with a justification.e. To ensure accuracy of test data, the bearing suppliers (or testing laboratory) shall certify that the data presented is the performance data for all bearings tested in the report and no data has been deleted.5.4 Disposit
34、ion of Report:A copy of the report shall be maintained by the supplier for a minimum of two years.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE ARP5448/6- 11 -5.5 Key Words:Bearing tests, confo
35、rmity, plain spherical bearingsPREPARED UNDER THE JURISDICTION OFSAE SUBCOMMITTEE ACBG-1, PLAIN BEARING OFCOMMITTEE ACBG, AIRFRAME CONTROL BEARINGS GROUPCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
