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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Your Alert Profile lists the documents that will be monitored. Round bars can be purchased in various diameters for standard carbon and alloy grades. Yield Strength ksi MPa 40 45 55 70 90 Elongation in 2 inch 50 mm percent min Tempering should be for a sufficient time to insure that hardened teeth reach the specified tempering temperature. High concentration polymer should be used with caution.
Test bars should be of the same steel type as the gear sbut not 2004-v89 the same heat. Quench and temper as a prior treatment can aid machinability. Inadequate cooling during normalizing can result agka gummy material, reduced tool life and poor surface finish. The standard wrought steel forms are round stock, 2004b-89 stock and forgings. Figure illustrates the depth of the compressive layer on steel at 31 and 52 HRC hardness according to intensity.
Castings must meet the nondestructive test requirements in the rim section.
Includes definitions, selection guidelines, heat treatment, quality control, life considerations and a bibliography. All rough ferrous gear castings, forgings and barstock have a surface layer containing decarburization, nonmetallic inclusions, seams, and other surface imperfections.
Alloys of copper are in wide use for power transmission gearing. Wrought or forged steel is generally considered more sound than castings because the steel is hot worked. Therefore, the hardness obtained at any location on a part will depend on carbon content, hardenability, part size, configuration, quench media, and quenching conditions.
Core Hardness for AGMA tooth design purposes is the hardness at the intersection of the root diameter and the centerline of the tooth at mid face width on a finished gear. This stress may improve the bending fatigue strength of a gear tooth as much as 25 percent.
Use of refrigeration may require agreement between the customer and supplier. Toughness of steel gearing is adversely affected by a variety of factors such as: Therefore, hardness determines the rating of the gear. Integral shaft pinions should, whenever possible, be hung or fixtured in the agms position axes vertical to minimize bowing. Fabricated welded gears are generally manufactured when they are more economical than forged or cast gears.
Approval by the customer may be required. For more consistent results, it is recommended that coarser pitched gears of leaner alloy steels receive a quench and temper pretreatment; for example, steel with teeth coarser than 3 DP. This is done for machinability, dimensional stability and possible grain refinement considerations.
Castings are heat treated to either a specified hardness or to specified hardness agmx minimum mechanical properties. Hillman Westinghouse, Air Brake B.
ANSI-AGMA 2004-B89-1995 Gear Materials and Heat Treatment Manual
Split gears are cast in two or four segments. If gear root hardness is critical to a specific design criteria, the gear tooth root hardness should be specified. Data contained herein represents a consensus from metallurgical representatives of member companies of AGMA. For induction hardening, the kW or power capacity of the equipment limits the pattern which can be attained.
These bending strength ratings are lower at 2040-b89 roots of teeth when only the tooth flanks are hardened. Distortion of the teeth from spin induction hardening is often considered more repeatable than with spin flame hardening, because of fewer human error factors involved during machine and inductor set–ups with induction hardening.
Vanadium content of 0. Coverage must be related to the part, not the Almen strip. Oil, Polymer or Air Quench media depends upon alloy content.
The preferred microstructure after quenching is primarily martensite. Parts of this type should be carefully reviewed for 2040-b89 depth specifications and for use of lower hardenability steels such as and Failure of any gear to meet hardness requirements specified is subject to rejection.
Cast iron gears are rated according to AGMA practice based on hardness.