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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Secondary amga processes can be used for reducing the gas, phosphorus, and sulfur levels of cast steel. Performance criteria include, but are not limited to, the following: For high bending strength applications, it is not desirable to have the hardening pattern 204-b89 in the roots of the teeth because of residual tensile stress considerations.
Minor discontinuities in finish machined teeth, if present, are often contour ground for removal, in preference to cosmetic weld repair. Some gearing does not lend itself to carburize hardening because of distortion.
Nonferrous gears are made from alloys of copper, aluminum, and zinc. Test bars should be of the same steel type as the gear sbut not necessarily the same heat.
Malleable iron is a heat treated white chilled iron which can be produced with a range of mechanical properties depending on the alloying practice and heat treatment. For more consistent results, it is recommended that coarser pitched gears of leaner alloy steels receive a quench and temper pretreatment; for agam, steel with teeth coarser than 3 DP.
Tanaka Nippon Gear R.
ANSI/AGMA B89 (R) – Gear Materials and Heat Treatment Manual
Flame hardened parts which are air quenched are self tempered, and separate tempering is unnecessary. Typically carbon and low alloy steels such as, and steels are used for carbonitriding. Castings should also be furnished free of sand and extraneous appendages. Parts are rotated when encircling coils are used. Carburized and hardened gearing is used when optimum properties are required. This energy controls the depth of the peening effect.
Selection of the grade of steel is limited to those alloys that contain metal elements that form hard nitrides as discussed in 5. To obtain accurate results on shallow case hardened parts, a superficial test must be used. These processes are used when gear teeth require high surface hardness, but size or configuration does not lend itself to carburizing and quenching the entire part. To minimize microcracking, parts should be tempered before and after refrigeration.
Cold drawing produces a close tolerance bar with improved mechanical properties higher hardness and yield strength.
ANSI-AGMA 2004-B89-1995 Gear Materials and Heat Treatment Manual
Wide faced gearing is heated by scanning type equipment while more limited areas can be heated aga stationary inductors. The production quantity of any gear must be sufficient to justify the cost of capital equipment and setup to surface hardened by either process, such as quantity production for the automotive industry. All publications are subject to revision, and the users of this standard are encouraged to apply the most recent editions of the publications listed.
Hardness may be lower as a result of prior heat treatment, alloy content, depth of hardening, heating time, mass and quenching considerations.
Heavy draft, cold drawn, stress relieved bars may be used as an alternative to quench and tempered steel. The quenching process is one of the major operations that influences the microstructure, hardness, mechanical properties and residual stress distribution, assuming 200-4b89 gear has been properly heated before the quench.
Heat sources designed to pass between adjacent teeth followed by quenching are desirable from both endurance or bending strength and wear considerations, because both the flanks of teeth and root diameter are hardened. Sgma hardening is more economical for smaller gears.
Normalizing is used primarily to obtain a uniform microstructure. The geometry will affect how quickly and uniformly the quenchant will circulate around the part. Furnace equipment with temperature uniformity, close temperature agmz, and accuracy of temperature recording and control instruments.
Burrell Metal Improvement Co.
Consideration should be given to evaluation of that portion of the case that is not removed during tooth finishing. A commonly referenced shot peening specification is Ag,a which identifies materials, equipment requirements, procedures, and quality control requirements for effective shot peening. Further improvements in strength afma be achieved by the use of hot forming powder metal.
Effective case depth for flame and induction hardened gears is normally defined as the distance below the 204-b89 at the 0. Nitride hardening can also be achieved with the ion nitriding process. With induction, this is usually not a problem with properly maintained equipment since electrical power characteristics, inductor movement and integral quench intensity can be readily controlled.
Case depth should be determined using a microhardness tester. The number of hardness tests made should be specified by the gear manufacturer.