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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ANSI-AGMA 2004-B89-1995 Gear Materials and Heat Treatment Manual
Direct quenching generally results in less distortion than slow cooled, reheated and quenched gears, providing gears are properly cooled from the carburizing temperature to the quench temperature before hardening. These processes result in a wear 2004-b8 surface layer of 0. Microstructure must be free of primary ferrite, such as is produced by annealing and normalizing, which produces a brittle case prone to spalling. Case depth should be determined on a normal tooth section, using an appropriate superficial or microhardness 2004-89.
Item Detail – ANSI/AGMA C08 (reaffirmed March )
The quenchant should produce acceptable as quenched hardness, yet minimize cracking. Process variables and design considerations have a significant effect upon the amount of distortion. The annealed structure is the least receptive to flame or induction hardening.
Most of these are used in worm gearing where the reduced coefficient of friction between dissimilar materials and increased malleability are desired. Gas carburizing consists of heating and holding low carbon alloy steel 0. Round bars can be purchased in various diameters for standard carbon and alloy grades. Salt baths and water quench systems should be avoided. Accurate heating to the proper surface temperature is a critical step. High alloy irons can be air quenched to moderate hardness levels.
Repairs in the rim tooth portion and other critical load bearing locations should be performed only prior to heat treatment.
Hot rolled material exhibits more dimensional change and variation than hot rolled, cold drawn material because of densification from cold working. These are high hardenability steels which can be crack sensitive in moderate to thin sections. Hardness may be lower as a result of prior heat treatment, alloy content, depth of hardening, heating time, mass and quenching considerations.
The above processes 5. The bainitic transformation range is below the pearlitic range, but above the martensitic range. Because of work hardening tendencies, feeds and speeds must be selected to minimize work hardening. Selection of the grade of steel is limited to those alloys that contain metal elements that form hard nitrides as discussed in 5. Surfaces can also be masked for subsequent machining. Shafting and gearing can also be progressively spin hardened by spinning the shaft or tooth section within the heat source and following quench head.
Gearing is removed from the heat source and immediately hardened by the quenchant. We have no document history for this standard. Coverage refers to the percentage of indentation that occurs on the surface of the part. Other AISI Type and proprietary chemical analyses are used for carbon and low alloy cast gears according to ASTM A or customer specifications, depending upon specified hardness mechanical propertiestype of heat treatment and controlling section size hardenability considerations.
Bores size may shrink up to 0. Casting should also be free of cracks, hot tears, chills, and unfused chaplets in the rim section.
The effective case depth is the hardened depth to HRC 50 at 0. Through hardening does not imply equal hardness through all sections of the part. Same as above; however, thin sections or sharp corners can represent a crack hazard. Direct surface hardness readings ASTM E or file checks at the tooth tip or flank will generally confirm the case hardness.
The higher 0204-b89 alloy content with high carbon, the greater the tendency for cracking. Table gives hardness guidelines for some steel grades.
The hardness and mechanical properties achieved from the quench and temper process are higher than those achieved from the normalize ag,a anneal process.
Shot type and size selection depends upon the material, hardness, and geometry of the part to be peened. Sulfur additions aid the machinability of these grades.
The as quenched surface hardness is dependent primarily on the carbon content of the steel part and cooling rate. Proceed to Checkout Continue Shopping.
ANSI/AGMA B89 (R) – Gear Materials and Heat Treatment Manual
This is defined as the depth at which the hardness is 10 HRC points below the minimum specified surface hardness. Through hardened gearing applications generally use,and type steels. Surface decarburization as defined for carburized gearing is a reduction in the surface carbon in the outer 0. This is done for machinability, dimensional stability and aagma grain refinement considerations. Case Depth of Nitrided Components. Case Depth of Carburized Components.
Gas carburizing consists of heating and holding low carbon or alloy steel less than 0. Each variety is available with a wide range of quench characteristics. These variations should not fall below the minimum, when core hardness is specified. Hardness and strengths able to be obtained by normalize and tempering are also a function of controlling section size and tempering temperature agna.
When a gear cannot be sectioned, hardness pattern and depth can be checked by polishing end faces of teeth and nitric acid etching. At times, redesign of components may be required to reduce distortion.