ANSI/AGMA C08 includes updated and extensively revised information from ANSI/AGMA B89 along with additional information needed to achieve . Download ANSI-AGMA B Gear Materials and Heat Treatment Manual. Index of AGMA Standards and Information Sheets by Number. 1 ANSI/AGMA B89 Gear Materials and Heat. Treatment Manual.
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ANSI-AGMA 2004-B89-1995 Gear Materials and Heat Treatment Manual
Other AISI Type and proprietary chemical analyses are used for carbon and low alloy cast gears according to ASTM A or customer specifications, depending upon specified hardness mechanical propertiestype of heat treatment and controlling section size hardenability considerations.
This is the preferred quench. Cast 2004-b899 gears are rated according to AGMA practice based on hardness. If the document is revised or amended, you will be notified by email.
AGMA quality level will be reduced approximately afma level from the green condition after flame or induction hardening unless subsequent finishing is performed.
Test bars should be of the same steel type as the gear sbut not necessarily the same heat. Repair welds in the tooth portion should only be performed with the approval of the gear purchaser. The general application of flame hardening is to the flanks only, except when spin flame hardening is applied. Minor discontinuities in finish machined teeth, if present, are often contour ground for removal, in preference to cosmetic weld repair.
Case depth in these instances may also be measured on a test bar, if bar size has been previously correlated to the gear tooth section refer to 5. It is not recommended for use in gear manufacturing specifications.
The strip is held flat on an Agmaa block qgma in the representative location during the peening operation. Smith Invincible Gear Y. Parts of this type should be carefully reviewed for case depth specifications and for use of lower hardenability steels such as and The nitriding process affects the rate of nitrogen adsorption and the thickness of the resultant brittle white layer on the surface. When four hardness tests are required, two tests should be made on the cope side, one over a riser and the other approximately degrees away between risers, and two tests on the drag side 90 degrees away from the tests on the cope side.
To obtain accurate results on shallow case hardened parts, a superficial test must be used. Many gears, particularly those used to transmit aagma rather than power, are produced from nonmetallic materials. Remarks for medium carbon alloy steel above apply. The tempered hardness varies inversely with tempering temperature. These changes occur in both quenched and tempered and surface hardened gears. Shapiro Arrow Gear W. Material Selection Guidelines Many factors influence the selection of materials for gears, and the relative importance of each can vary.
For tooth by tooth hardening, a segment of a gear can be hardened and sectioned.
Vanadium content of 0. Steels containing chromium, vanadium, aluminum, and molybdenum, either singularly or in combination, are required in order to form stable nitrides at the nitriding temperature. Unground worm gear cases may be decreased accordingly.
Furnaces should be capable of maintaining a carburizing atmosphere with controllable carbon potential. This results in simultaneous absorption of carbon and nitrogen, which results in the formation of complex nitrides in a high carbon case.
However, fatigue properties of this steel may not be equivalent to quench and tempered steel with the same tensile properties.
Repair welding in other than the tooth portion may be performed by the casting supplier. Mechanical means for moving the work through the agka stream by either translation or rotation, or both, should be provided.
When amga or air quenching is used, a coolant is used on a portion of the metal away from the heating zone to maintain the base metal near ambient temperature so the part mass can absorb heat from the heated zone.
However, residual stresses from quench and tempering may be relieved at the nitriding temperature, causing distortion. Larger gears are usually solid hub, split hub, or split hub and rim design, which incorporate cast arms rather than the heavier solid web design used for smaller gears.
Appendix B illustrates the controlling section for various gear configurations whose teeth are machined after heat treatment. Material selection and heat treat condition prior to flame or induction hardening 2004-n89 affects the hardness and uniformity of properties which can be obtained. Underheating results in less than specified hardness and case depth.