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.
Reference should be made to the ASM Metals Handbook, 9th Edition, Volume 4 on Heat Treating for additional information on laser and electron beam heat treating, as well as other modifications of heat treatments applied to gearing. Approval by the customer may be required.
Item Detail – ANSI/AGMA C08 (reaffirmed March )
Distortion increases as a greater crosssection of a tooth is hardened. Through hardening may be used before or after the gear teeth are formed. Repair welds in the tooth area should be performed only with the approval of the gear manufacturer. The powder metal process is wellsuited to the production of gears for several reasons: It is not recommended for use in gear manufacturing specifications. Quench time and temperature are critical and inspray quenching, pressure velocity and direction of the quench media must be considered.
Shallower case depths are generally specified for carbonitriding than is usual for production carburizing. The bainitic transformation range is below the pearlitic range, but above the martensitic range.
This is accomplished by shot peening several strips at various times of exposure to the shot stream and plotting the resulting arc heights. To aid in obtaining the above characteristics, the heat treater should be given the following as a minimum: The following documents contain provisions which, through reference in this Standard, constitute provisions of this document.
Annealed or normalized ductile cast iron has good machinability. Also, as a result of lower mass, fragmented shot particles will lengthen the time to reach a specified peening intensity. Smith Invincible Gear Y. Many gears, particularly those used to transmit motion rather than power, are produced from nonmetallic materials.
Topics included are definitions, selection guidelines, heat treatment, quality control, life considerations and a bibliography. The strength properties are closely related to material hardness, which is used in AGMA gear rating practice.
When a gear cannot be sectioned, hardness pattern and depth can be checked by polishing end faces of teeth and nitric acid etching. Repair welding of castings prior to heat treatment is routinely performed by the casting producer.
Each quenchant should be used within its appropriate range of temperature. Agitation is externally produced movement of the quenchant past the part. The white layer thickness is also dependent upon the analysis of steel. During nitriding, nitrogen atoms are absorbed into the surface to form hard iron and alloy nitrides. Large sections normally require water or low concentration polymer.
The most common gear brass is yellow brass, used because of its good machinability. Please first log in with a verified email before subscribing to alerts.
ANSI-AGMA 2004-B89-1995 Gear Materials and Heat Treatment Manual
For a given composition the Jominy hardenability data falls within a predicted range. Grit blasting is also occasionally used. There are two basic methods of flame or induction hardening gears, spin hardening and tooth to tooth hardening. Thin section gears, such as bevel ring gears, may be press quenched to minimize distortion.
The hardness tests shall be spaced uniformly around the circumference. Good response in well agitated conventional oil or polymer. Salt baths and water quench systems should be avoided.