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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Gear brasses are selected for their corrosion resistant properties. Flame hardening may also cause burning or melting of tooth surfaces. Carburized and hardened gearing is used when optimum properties are required.
ANSI/AGMA B89 (R) – Gear Materials and Heat Treatment Manual
In the latter process, full coverage has been achieved when no traces of the dye remain when viewed under ultraviolet light. If distortion control is very critical, the newer ion nitriding process should be considered. This 204-b89 controls the depth of the peening effect.
Ductile 2004-b9 castings shall be heat treated by annealing, normalizing and tempering or quenching and tempering or ascast as required to meet the specified mechanical properties. For added copper alloy information, also afma SAE J Large sections normally require water or low concentration polymer. Specifying both tempering temperatures and hardness ranges on a drawing causes an impractical situation qgma the heat treater.
Use of electron beam heat treating for gear 5. 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.
Forging stock is always fully killed steel to minimize the occurrence of fissures due to dissolved gases during the forging process. Application is limited because quantities or critical application considerations must justify the increased development and die costs.
Density is the most significant characteristic of powder metal materials. Please first log in with a verified email before subscribing to alerts. However, if sulfur content is low, less than 0. These processes may also be used 2004-b98 the maximum contact and bending strength achieved by carburizing is not required. Stock removal by grinding after carburize hardening should be limited to approximately 0.
However, even with perfectly uniform sections, parts can easily crack if made of highcarbon, highhardenability steels and the quench is too severe. Subscription pricing abma determined by: This group of gear materials includes bronzes, brasses, and other copper alloys. 20004-b89 tests aagma surface hardness should be made on a mounted and polished crosssection at a depth of 0. Typical cast gear designs are shown in Fig In both carbon and alloy steels, normalized or annealed structures can be hardened.
Shapiro Arrow Gear W. With good machinability as a base, a fair rating would add 20 to 30 percent to the machining cost, and poor would add 40 to 50 percent. Some of the more critical requirements are outlined below. Diameter of Tooth Portion, in mm To 3 76 incl.
ANSI-AGMA 2004-B89-1995 Gear Materials and Heat Treatment Manual
The designer should specify the following on the drawing. Work continued on the Standard with numerous additional revised drafts within the Metallurgy and Materials Committee until it was balloted in Salt baths and water quench systems should be avoided.
Lack of repeatability is due to the greater number of variables which affect distortion. The intensity governs the depth of the compressive layer and must be specified as the arc height on the A, C, or N strip see 5. There are two basic methods of flame or induction hardening gears, spin hardening and tooth to tooth hardening.
Fig Directionality of Forging Properties 4.
2004-b8 This method produces a rough dimensioned piece by mechanical deformation between an upper and lower die hammer and anvil in an open frame press or hammer. For induction hardening, the kW or power capacity of 2004-b98 equipment limits the pattern which can be attained.
In ascending order of hardness for a particular type of steel they are; annealing, normalizing or normalizing and temperingand quenching and tempering. The minimum number of hardness tests required on both rim faces of gear castings is generally based on the outside diameter.
However, the higher carbon results in lower machinability. Powder metal parts are formed by compressing metal powders in a die cavity and heating sintering the resultant compact to metallurgically bond the powder particles.
The actual part must be examined for complete coverage in all areas specified to be shot peened. Repair welding in the tooth portion should only be performed with the approval of the gear purchaser. Grade and Heat Treatment. Hardenability is constant for a given steel composition; however, hardness will vary with the cooling rate.
These are high hardenability steels which can be crack sensitive in moderate to thin sections. Gearing which distorts and cannot be straightened without cracking, rack gears, thin sections, complex shapes, parts not designed for finishing or where finishing is cost prohibitive, present manufacturing problems.
Case Depth of Carburized Components. Above HB, machinability is poor. Tensile test bars for sand castings may be attached to casting or cast separately. Steels purchased to predicted hardenability ranges are called HBand steels. The part design and manufacturing process must consider movement during heat treatment. Fair to good machinability if normalized and tempered, annealed or quenched and tempered.