1、Designation: F2953 12Standard Specification forPhenolic Raw Materials for the Use in Bearing Cages1This standard is issued under the fixed designation F2953; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers basic characteristics requiredfor porous laminated phenolic materials intended for use asinstrument and t
3、hin-section ball-bearing retainers (cages) andthe methods of determining these characteristics.1.2 FormsSheets, rolled tubes, molded tubes, and rods arerecommended forms of laminated material covered by thisspecification.1.3 Intended UseMaterials produced to this specificationare intended for use as
4、 ball-bearing retainers (cages). Tempera-ture range is limited to 250F (117C) and below.1.4 UnitsThe values stated in inch-pound units are to beregarded as the standard. The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not consider
5、ed standard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.
6、Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD695 Test Method for Compressive Properties of RigidPlasticsD792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementE11 Specification for Woven Wire Test Sieve Cloth a
7、nd TestSieves2.2 ANSI/ASQC Standard:3ANSI/ASQC Z1.4 Sampling Procedures and Tables for In-spection by Attributes2.3 Federal Standard:4MIL-STD-129 Military Making for Shipment and Storage3. Classification3.1 The material shall be furnished in the following typesand forms as specified:Type Description
8、FB Rolled tube made from cotton fabric weighing 4 oz/yd2(0.14 kg/m2)or less, with a nominal thread count of 80 by 80 threads per inch(31.5 by 31.5 cm).FBFW Rolled tube made from cotton fabric weighing 4 oz/yd2(0.14 kg/m2)or less, with a nominal thread count of 100 by 100 threads per inch(39.4 by 39.
9、4 cm).FBEFW Rolled tube made from cotton fabric weighing 3 oz/yd2(0.1 kg/m2)orless, with a nominal thread count of 130 by 130 threads per inch(51.2 by 51.2 cm).4. Ordering Information4.1 Procurement documents should specify the following:4.1.1 Title, designation, and date of this specification;4.1.2
10、 Type required (see Section 3); Property values fortubes (see Table 1);4.1.3 Dimensions required; and4.1.4 Special marking required (see 9.2).4.2 Required test data shall be requested at the time thepurchase order is submitted and listed on the purchase order.5. Order of Precedence5.1 In the event o
11、f a conflict between the text of thisspecification and references cited herein, the text of thisspecification takes precedence. Nothing in this specification,however, supersedes applicable laws and regulations unless aspecific exemption has been obtained.6. Performance Requirements6.1 Performance re
12、quirements for sheet laminated materialsshall be as specified in Table 2.6.2 TubesThe tubes shall consist of base material (rein-forcement) as described in 6.3 impregnated and bonded with anon-plasticized phenolic resin. Tubes will be made by passingthe impregnated material over heated rolls and win
13、ding the1This test method is under the jurisdiction of ASTM Committee F34 on RollingElement Bearings and is the direct responsibility of Subcommittee F34.06 onAerospace.Current edition approved June 1, 2012. Published November 2012. DOI:10.1520/F295312.2For referenced ASTM standards, visit the ASTM
14、website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Society for Quality (ASQ), 600 N. Plankinton Ave.,Milwaukee, WI 53203, http:/www.as
15、q.org.4Available from U.S. Government Printing Office Superintendent of Documents,732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http:/www.access.gpo.gov.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1heated material o
16、nto a mandrel while applying pressure to thematerial/mandrel. The overwrapped mandrel is then placed inan oven to cure the tube.6.3 Base Materials:6.3.1 Cotton Fabric ConstructionThe material shall con-sist of a woven cotton fabric substrate impregnated and bondedwith a phenolic resin matrix and pro
17、cessed to meet therequirements of this specification (see Table 3). Finished fabricshall be de-sized, washed, and bleached, with remainingimpurities per acetone extraction, not greater than 1.5 % afterfinishing. See 8.5 for method of test.6.3.2 PaperType PB tubes shall be made from a saturatinggrade
18、 of paper. The caliper of the paper shall be between 2 and6 mils (0.05 and 0.15 mm). The paper shall be bleached.6.4 Property ValuesTubes shall conform to the propertyvalues shown in Table 1 when tested in accordance withSection 8. The property value requirements for special sizes oftubes shall be a
19、s specified in the purchase order (see Section 4).6.4.1 Diameter of Rolled Round TubesThe range of sizesfor rolled round tubes shall be as specified in Table 4. Theinside diameter and outside diameter shall be included in thepart number. An example of a part number for a rolled tubewith an inside di
20、ameter of 0.188 in. (0.478 cm) and an outsidediameter of 0.250 in. (0.635 cm) is TRR-0.188/0.250. The wallthickness tolerances for finished outside diameter shall be asspecified in Table 5.6.4.2 Diameter of Molded Round TubesThe range of sizesof molded round tubes shall be as specified in Table 4. T
21、heinside diameter and outside diameter shall be included in thepart number. An example of a part number for a molded roundtube with an inside diameter of 0.125 in. (0.318 cm) and anoutside diameter of 0.188 in. (0.478 cm) is TMR-0.125/0.188.The wall thickness tolerances for finished outside diameter
22、shall be as specified in Table 5.6.4.3 Diameter of RodsThe range of sizes and tolerancesfor rods shall be as specified in Table 4. The outside diameterof the rod shall be included in the part number.6.4.4 Thickness of SheetsThe thickness of laminatedsheets, permissible variations, and the applicable
23、 part numbershall be as specified in Table 7.6.5 PrepregThe prepreg shall be used within six monthswhen stored at 68 6 5.4F (20 6 -14.7C) and 50 % maximumrelative humidity.6.6 ResinShall be used and stored within the manufactur-ers requirements.6.7 Surface DefectsFinished OD diameters shall be freef
24、rom blisters, loose layers, resin pockets, voids and wrinkles.Finished walls shall show no checks or cracks between thelaminations on machined or sawed edges.As an option, a buyermay request an unfinished OD or trimmed length or both.6.8 WarpageThe warpage of material furnished in thetube form, as d
25、elivered, shall not be greater than the following(see 8.4):Tubes and RodOutside Diameter (OD)and Sheet ThicknessInchPermissible WarpMaximum PercentSheets Tubes / Rod0.031 up to 0.063 5.0 (-)0.063 up to 0.126 2.5 (-)0.126 up to 0.251 1.0 2.00.251 up to 0.750 0.5 1.00.750 to Max. 0.25 0.5NOTE 1Percent
26、age of warp is specified in terms of 36-in. (91-cm)material lengths.6.9 ColorThe natural color of the tubes may vary and isnot a cause for rejection.6.10 Tolerances:6.10.1 LengthsUnless otherwise specified (see Section 4),tubes shall be furnished in manufacturers standards lengths.6.10.2 Diameters a
27、nd Wall Thickness:6.10.2.1 SizesThe ID, OD, and wall thickness of the tubesshall be specified by any two, but only two, dimensions (seeSection 4).6.10.2.2 Tolerances on DiametersUnless otherwise speci-fied (see Section 4), ID and OD for tubes shall conform to thespecified dimensions for nominal ID o
28、r OD within the toler-ances shown in Table 4.6.10.2.3 Tolerances on Wall ThicknessUnless otherwisespecified (see Section 4), tubes shall conform to the specifieddimensions for nominal ID and OD, but variations in wallthickness shall not be greater than the tolerances shown inTable 5.6.11 Surface Fin
29、ishTubes shall be finished to meet thecustomer requirements.6.12 Degree of CureAcetone extractable matter shall benot greater than 1.5 % (see 8.5).7. Verification7.1 Responsibility for InspectionUnless otherwise speci-fied in the contract or purchase order, the contractor isresponsible for the perfo
30、rmance of all inspection requirements(examinations and tests) as specified herein. Except as other-wise specified in the contract or purchase order, the contractormay use his own or any other facilities suitable for theperformance of the inspection requirements specified herein,unless disapproved by
31、 the customer. The customer reserves theright to perform any of the inspections set forth in thisspecification when such inspections are deemed necessary toensure supplies and services conform to prescribed require-ments.7.2 Conformance Inspection:7.2.1 Sampling for Conformance InspectionSampling fo
32、rconformance inspection shall be performed in accordance withTABLE 1 Performance Requirements for TubesASTM TestMethod D348PB FB FBFW FBEFWAcetone extraction(Maximum %)1.5 1.5 1.5 1.5Compressive strengthaxialA(Minimum psi)18 000 28 000 28 000 28 000Specific gravityA(Range gm/cc)1.24-1.34 1.24-1.34 1
33、.28-1.38 1.28-1.38APounds per square inches (psi). 1 psi = 6.8948 kPa. Test is limited to tubes0.250-in. (0.635-cm) and greater ID. One specimen to be taken from center ofsample tube. The other two specimens to be taken 1 in. (2.54 cm) from each endof the sample tube.F2953 122ASQC-Z1.4 unless otherw
34、ise specified. For purpose ofsampling, an inspection lot for examination and tests shallconsist of all materials of the same type dimensions, resin, andbase material from one impregnation run.7.2.2 Examination of MaterialExamination of materialshall be made in accordance with 7.4. The lot size forde
35、termining the sample size in accordance with ASQC-Z1.4shall be expressed in units of tubes.7.3 Appearance and WorkmanshipThe sample unit for thefollowing examination shall be tubes of the specified lot. Theinspection level shall be per ASQC-Z1.4, Level II withacceptance quality levels (AQLs) as foll
36、ows: 1.5 for majordefects and 6.5 for minor defects. Classifications of defects arelisted in Table 6.7.4 TestingTubes shall be tested for applicable character-istics as indicated in Table 1 on each lot presented forinspection. The inspection level for determining the samplesize shall be S-1 per ASQC
37、-Z1.4 except that not less than twosample units shall be randomly selected from a lot. The lot sizeshall be expressed in units of tubes. The AQL shall be 6.5.Describe all failures and report all values on which test resultsare based.8. Test Methods8.1 MeasurementsTube shall be examined and dimen-sio
38、ns other than length recorded to the nearest 0.001 in. (0.00254 cm). Length shall be measured to the nearest; 0.0625 in.(0.1588 cm) for less than 1-in. (2.5-cm) OD diameter, 0.125 in.(0.3175 cm) for less than 2-in. (5-cm) OD diameter, 0.250 in.(0.635 cm) for less than 4-in. (10-cm) OD diameter, and
39、1.0 in.(2.54 cm) for OD diameters greater than or equal to 4 in. (10cm).8.2 Axial Compressive Strength:8.2.1 The axial compressive strength shall be determined byTable 1 and Test Method D695, except that the specimen lengthshall be 1 in. (2.54 cm) for tubes to 2-in. (5-cm) OD or lesswith wall thickn
40、ess of 0.0625 in. (0.1588 cm) or over.8.2.2 The axial compressive strength requirement and testmethod for tubes over 2 in. (5 cm) in OD or with walls lessthan 0.0625 in. (0.1588 cm) will be as specified in the purchaseorder.8.3 Specific GravityThe specific gravity shall be as deter-mined by Test Met
41、hods D792.8.4 WarpageThe warpage of material furnished in thetube form, as delivered, shall be not greater than the following(8.4.1-8.4.3):8.4.1 ApparatusA horizontal flat surface and rigid barwith a vertical plane surface firmly fixed at right angles to theflat surface shall be at least as long as
42、the specimen to be tested.The height of the bar shall exceed by one half the outsidediameter of the tube. Feeler gauges shall also be required.8.4.2 ProcedureThe specimen shall be placed on thehorizontal flat surface and rotated against the vertical planesurface of the rigid bar. The bar shall be fi
43、rmly fastened to thehorizontal flat surface. The maximum separation between thetube and the vertical plane surface shall be measured to thenearest 0.001 in. (0.0025 cm).8.4.3 Report and CalculationWarp or lack of bearingstraightness shall be reported as the maximum separation orany part of the tube
44、from a straight edge which contacts theends of the specimen. The maximum length tested for warpageshall be 18 in. (46 cm). The warpage shall then be calculated asfollows:W 5 36D!L2# 3100 (1)where:W = percentage of warp, calculated to a 36-in. (91-cm)length,D = maximum deviation of tube from straight
45、 edge in inches(centimetres), andL = length of tube in inches (centimetres).TABLE 2 Performance Requirements for FB SheetsRequirement ConditionASTMTestMethodUnitThickness (in.)A0.031 0.062 0.094 0.125 0.188 0.250 0.500 0.750 1.000 1.001 Max.Impact strengthBMin.Lengthwise: E-48/50 D229 ft-lbs 1.25 1.
46、25 1.25 1.25 1.25 1.25 1.25Crosswise: perinch1.00 1.00 1.00 1.00 1.00 1.00 1.00Flexural strengthLengthwise: A D229 Min. 16 000 16 000 16 000 16 000 16 000 16 000 15 000 15 000 14 500 14 500Crosswise: psi 14 000 14 000 14 000 14 000 14 000 14 000 13 500 13 500 13 000 13 000Thermal enduranceFlexural s
47、trength:D2304 Min.psiBonding strengthBAD-48/50D229 Min.pounds16001500160015001600150016001500Water absorption D124/23D229 Max.percent4.00 1.95 1.55 1.30 1.00 0.95 0.70 0.60 0.55 0.55Silicone content E-168/185Max.ppm50 50 50 50 50 50 50 50 50 50A1 in. = 2.54 cm. 1 lb = 0.45 kg. 1 psi = 6.8948 kPa.BMa
48、ximum thickness tested shall be 2.000 in. (5.08 cm).TABLE 3 Cotton FabricsFB FBFW FBEFW80 80 100 100 130 130Tolerance of 5 % Tolerance of 5 % Tolerance of 5 %F2953 1238.5 Acetone ExtractionAcetone extraction shall be used todetermine amount of acetone soluble matter remaining inlaminated phenolic pr
49、oducts.8.5.1 Apparatus:8.5.1.1 SievesThe set of sieves used shall consist of Nos.40 (425 m) and 140 (106 m), with a cover and receiving pan,conforming to the requirements of Specification E11 for wirecloth sieves for testing purposes.8.5.1.2 Extraction ApparatusThe apparatus may be of thetype shown in Fig. 1 or a Wiley-Richardson type as shown inFig. 2. The former type is better for use with small electric hotplates, while the latter controls the temperature so that the rateof extraction can be regulated accurately.8
