ASTM F2730/F2730M-11

Standard Specification for Silicon Nitride Cylindrical Bearing Rollers

SCOPE
1.1 This specification covers the establishment of the basic quality, physical/mechanical property, and test requirements for silicon nitride rollers Classes I, II, and III to be used for cylindrical roller bearings.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

• Status: Historical
• Publication Date: 31-May-2011
• ICS: 21.100.20 - Rolling bearings
• Technical Committee: F34 - Rolling Element Bearings
• Drafting Committee: F34.01 - Rolling Element

Relations

• Replaces: ASTM F2730/F2730M-08 - Standard Specification for Silicon Nitride Cylindrical Bearing Rollers
• Effective Date: 01-Jun-2011
• Replaced By: ASTM F2730/F2730M-13 - Standard Specification for Silicon Nitride Cylindrical Bearing Rollers
• Effective Date: 01-Oct-2013

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F2730/F2730M −11
StandardSpecification for
1
Silicon Nitride Cylindrical Bearing Rollers
ThisstandardisissuedunderthefixeddesignationF2730/F2730M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope R 1607Testing Method for Fracture Toughness of High
Performance Ceramics
1.1 This specification covers the establishment of the basic
5
2.5 CEN Standards:
quality, physical/mechanical property, and test requirements
EN 843-1 Advanced Technical Ceramics—Monolithic
for silicon nitride rollers Classes I, II, and III to be used for
Ceramics—Mechanical Properties at Room Temperature,
cylindrical roller bearings.
Part 1, Determination of Flexural Strength
1.2 The values stated in either SI units or inch-pound units
ENV 843-5 Advanced Technical Ceramics—Monolithic
are to be regarded separately as standard. The values stated in
Ceramics—Mechanical Properties at Room Temperature,
each system are not exact equivalents; therefore, each system
Part 5, Statistical Analysis
must be used independently of the other. Combining values
from the two systems may result in nonconformance with the
3. Terminology
specification.
3.1 Definitions of Terms Specific to This Standard:
2. Referenced Documents 3.1.1 chips—break-outs of material greater in extent than
0.25mmtypicallyatthecornerchamfersorthejunctionofthe
2.1 Order of Precedence:
chamfers with the cylindrical surface or end face.
2.1.1 In the event of a conflict between the text of this
3.1.2 cracks—irregular, narrow breaks in the surface of the
document and the references herein, the text of this document
roller typically having a visible width of less than 0.002 mm.
takes precedence. Nothing in this document, however, super-
Most cracks are formed after densification but occasionally
sedes applicable laws and regulations unless a specific exemp-
may be present as material faults. Some cracks may not be
tion has been obtained.
visiblewithnormalwhitelightmicroscopyandmayonlyshow
2
2.2 ASTM Standards:
up under ultraviolet light after processing with a suitable
C1161Test Method for Flexural Strength of Advanced
fluorescent penetrant.
Ceramics at Ambient Temperature
3.1.3 cuts—short linear or circumferential grooves having a
C1421Test Methods for Determination of Fracture Tough-
width of more than 0.005 mm and a length of more than 0.20
ness of Advanced Ceramics at Ambient Temperature
3
mm. Cuts are normally assessed under roller surface appear-
2.3 ASME Standard:
ancebutlargeand/ornumerouscutscanbeconsidereddefects.
B 46.1Surface Texture (Surface Roughness, Waviness, and
Lay)
3.1.4 flats—flat bands running along the length of the
4
2.4 JIS Standards:
cylindrical part of the roller, usually caused by a stop in
R 1601Testing Method for Flexural Strength (Modulus of
rotation of the roller during machining. Flats can also be
Rupture) of High Performance Ceramics
formedatoneendonlybyincorrectapproachintoamachining
operation.
1
ThisspecificationisunderthejurisdictionofASTMCommitteeF34onRolling 3.1.5 grooves—shallow machining marks having a width of
Element Bearings and is the direct responsibility of Subcommittee F34.01 on 1
more than 0.005 mm extending more than ⁄4 of the circum-
Rolling Element.
ference on the cylindrical surface or having a length of more
Current edition approved June 1, 2011. Published June 2011. Originally
1
than ⁄4 of the roller diameter on the end faces.
approved in 2008. Last previous edition approved in 2008 as F2708/F2708M–08.
DOI: 10.1520/F2730_F2730M-11.
3.1.6 inclusions—isolatedareasofceramicsecondphasesor
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
metallic appearing phases. Inclusions are often the result of
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
contamination by foreign material during the roller blank
the ASTM website.
manufacturing process.
3
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
www.asme.org.
5
4
Available from Japanese Standards Organization (JSA), 4-1-24 Akasaka Available from European Committee for Standardization (CEN), 36 rue de
Minato-Ku, Tokyo, 107-8440, Japan, http://www.jsa.or.jp. Stassart, B-1050, Brussels, Belgium, http://www.cenorm.be.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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F2730/F2730M−11
3.1.7 material lot—single process lot of silicon nitride raw ligh
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:F2730/F2730M–08 Designation: F2730/F2730M – 11
Standard Specification for
1
Silicon Nitride Cylindrical Bearing Rollers
ThisstandardisissuedunderthefixeddesignationF2730/F2730M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification covers the establishment of the basic quality, physical/mechanical property, and test requirements for
silicon nitride rollers Classes I, II, and III to be used for cylindrical roller bearings.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two
systems may result in nonconformance with the specification.
2. Referenced Documents
2.1 Order of Precedence:
2.1.1 In the event of a conflict between the text of this document and the references 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
2.2 ASTM Standards:
C1161 Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature
C1421 Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature
3
2.3 ASME Standard:
B 46.1 Surface Texture (Surface Roughness, Waviness, and Lay)
4
2.4 JIS Standards:
R 1601 Testing Method for Flexural Strength (Modulus of Rupture) of High Performance Ceramics
R 1607 Testing Method for Fracture Toughness of High Performance Ceramics
5
2.5 CEN Standards:
EN 843-1 Advanced Technical Ceramics—Monolithic Ceramics—Mechanical Properties at Room Temperature, Part 1,
Determination of Flexural Strength
ENV 843-5 Advanced Technical Ceramics—Monolithic Ceramics—Mechanical Properties at Room Temperature, Part 5,
Statistical Analysis
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 chips—break-outs of material greater in extent than 0.25 mm typically at the corner chamfers or the junction of the
chamfers with the cylindrical surface or end face.
3.1.2 cracks—irregular, narrow breaks in the surface of the roller typically having a visible width of less than 0.002 mm. Most
cracks are formed after densification but occasionally may be present as material faults. Some cracks may not be visible with
normal white light microscopy and may only show up under ultraviolet light after processing with a suitable fluorescent penetrant.
3.1.3 cuts—short linear or circumferential grooves having a width of more than 0.005 mm and a length of more than 0.20 mm.
Cuts are normally assessed under roller surface appearance but large and/or numerous cuts can be considered defects.
3.1.4 flats—flat bands running along the length of the cylindrical part of the roller, usually caused by a stop in rotation of the
1
This specification is under the jurisdiction of ASTM Committee F34 on Rolling Element Bearings and is the direct responsibility of Subcommittee F34.01 on Rolling
Element.
Current edition approved Nov. 15, 2008. Published January 2009. DOI: 10.1520/F2730_F2730M-08.
Current edition approved June 1, 2011. Published June 2011. Originally approved in 2008. Last previous edition approved in 2008 as F2708/F2708M–08. DOI:
10.1520/F2730_F2730M-11.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
www.asme.org.
4
Available from Japanese Standards Organization (JSA), 4-1-24 Akasaka Minato-Ku, Tokyo, 107-8440, Japan, http://www.jsa.or.jp.
5
Available from European Committee for Standardization (CEN), 36 rue de Stassart, B-1050, Brussels, Belgium, http://www.cenorm.be.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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F2730/F2730M – 11
roller during machining. Flats can also be formed at one end only by incorrect approach into a machining operation.
1
3.1.5 grooves—shallow machining marks
...