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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Surface carbon content may be determined from a round test bar by taking turnings to a depth 2004-h89 0. High surface hardness, high case strength, favorable compressive residual stress in the hardened case, and suitable core properties based on selection of the appropriate carburizing grade of steel, result in the highest AGMA gear tooth ratings for contact stress, pitting resistance and root strength bending.
Sequence of manufacture is dependent upon design considerations and the temperature used for stress relief. Castings should be furnished free of sand, scale, extraneous appendages, and hard areas resulting from arcairing, gas cutting, and repair welding which could adversely affect machining.
The process of increasing hardness, typically through heating and cooling. Induction heating depth and pattern are controlled by frequency, power density, shape of the inductor, agms geometry and workpiece area being heated.
Calcium additions in steel making form hard, irregular inclusions and can also benefit machining. Carburizing technology is well established and the available equipment and controls make it a reliable process. Amount of distortion increases agms case pattern depth and increases as more of the tooth cross section is hardened, compared to profile hardened tooth patterns.
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.
Specifications describe type of bronzes according to chemical analysis.
ANSI/AGMA B89 (R) – Gear Materials and Heat Treatment Manual
Contour induction hardening of tooth profiles produce less distortion and growth than spin hardening methods. Bars should accompany gearing through all heat treatments, including all post hardening treatments. Shot types available are cast steel Sconditioned cut wire CWglass bead, and ceramic.
Shallower case depths are generally specified for carbonitriding than is usual for production carburizing. For induction hardening, the kW or power capacity of the equipment limits the pattern which can be attained. Tensile test bars for sand castings may be attached to casting or cast separately. Size limitations and mechanical properties are listed in Table The induction coil method is generally limited to gears of approximately 5 DP and finer.
In the latter process, full coverage has been achieved when no traces of the dye remain when viewed under ultraviolet light.
ANSI-AGMA 2004-B89-1995 Gear Materials and Heat Treatment Manual
Failure of any gear to meet hardness requirements specified is subject to rejection. It should be of the same specified material grade, with regard to composition and hardenability limits, as the gear it represents. Whenever a processing procedure is developed for a new part, an intensity curve must be developed which establishes the time required to reach peening saturation of the Almen strip. Typical Distortion Characteristics of Carburized Gearing. Table gives hardness guidelines for some steel grades.
When these limits are reached, the shot should be classified and separated to restore size and shape integrity as shown in MILSB. Chemical composition and microstructure of steel have major influences on machinability, since they affect properties and structures.
Other tensile properties and hardnesses should be used only by agreement between gear manufacturer and casting producer.
Steels can be purchased to HBand, or restricted HBand, specifications. The rim or tooth section is heat treated to obtain specified hardness mechanical properties prior to weld assembly.
These variations should not fall below the minimum, when core hardness is specified. Ayma can result which can reduce fatigue strength to a moderate degree. Improved cleanliness reduced nonmetallic inclusion content results in improved transverse ductility and impact strength, but machinability may be reduced; for example, with sulfur content less than 0. Carrigan Emerson Electric P. This is the name given to a family agna high strength yellow brasses. Machinability of Common Gear Materials.
The size of cast gearing varies from Typically carbon and low alloy steels such as, and steels are used for carbonitriding. Carburized case depth terms are defined as follows: There is poor correlation between microstructure readings and material strength gradients using this method.