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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Selection of the gear blank producing method for most applications is primarily a matter of economics, with quality becoming 2004-8b9 important as tooth loads, down time costs and safety considerations increase. The carburized case depth referred to in this Manual will be effective case depth.
Parts are also not heated above the transformation temperature or previous tempering temperature of the steel during nitriding, and are not quenched, as occurs during carburizing, flame or induction hardening. All publications are subject to revision, and the users of this standard are encouraged to apply the most recent editions of the publications listed. The geometry will affect how quickly and uniformly the quenchant will circulate 2004-89 the part. Burrell Metal Improvement Co.
See ASTM A48 for tolerances on as cast and machined diameter and retest considerations if bar fails to meet requirements. Table gives hardness guidelines for some steel grades.
Rickt Auburn Gear H. Incoming Material Hardness Tests.
Pearlite is a microstructure consisting of lamellar layers of ferrite and cementite, with a body centered cubic crystal structure. Penetration hardness testing cannot be correlated to material strength, but parts will achieve a file hard surface. Selection should be made on the basis of material hardness and hardenability, chemistry, cleanliness, performance, and economical considerations.
Dual laser beam optics have been developed, however, for flank and root contour surface hardening of gear teeth.
This stress may improve the agmx fatigue strength of a gear tooth as much as 25 percent. The minimum inscribed diameter on a test disc or plate dimensions should be a minimum of three times its thickness. Usually an 20044-b89 of 0. Case Depth of Nitrided Components. Table presents chemical analyses of common wrought bronze alloys, while Table presents typical mechanical properties of these wrought bronze alloys in rod and bar form. Lower core hardness results in a microstructure which causes a lower surface hardness nitrided case, since it 2004b-89 the ability to form high concentration of hard metallic nitrides.
Ferrous gearing may be through hardened or surface hardened when gear rating or service requirements warrant higher hardness and strength for improved fatigue strength or wear resistance.
Through hardened gears are heated to a required temperature and cooled in the furnace or quenched in air, gas or liquid. Contact fatigue strength may also be improved in some instances by shot peening, but quantitative data to substantiate this condition is limited.
ANSI-AGMA 2004-B89-1995 Gear Materials and Heat Treatment Manual
For more information, consult the following: Quench cracks usually originate at sharp corners or substantial section size changes. Density is the most significant characteristic of powder metal materials. Tempering of the hardened structure reduces the volume, but the combined effects of quenching and tempering still result in a volume and size increase.
Microstructure is 200-b89 material structure observed on a sample polished to a 20044-b89 finish, etched, and viewed at X or higher magnification. Bruce Kelly General Motors D.
[PDF] ANSI-AGMA B Gear Materials and Heat Treatment Manual – Free Download PDF
When specifying parts with small quantity requirements, standard alloys should be specified or engineering drawings should allow optional materials. Yield Strength ksi MPa 40 45 55 70 90 Elongation in 2 inch 50 mm percent min Remarks for medium carbon alloy steel above apply.
The major factors of the quench and temper process that influence hardness and material strength are: Effective case depth at roots are typically percent of mid tooth height case depths, and tips may be percent of mid tooth height case depths. For coarser pitches, requirements should be worked out with the supplier.
The bainitic transformation 2004–b89 is below the pearlitic range, but above the martensitic range. Craig Cummins Engine T. These fragmented particles can cause surface damage. AGMA gear rating standards should be consulted for appropriate stress numbers. The general application of flame hardening is to the flanks only, except when spin flame hardening is applied.
The temperature of a agmz quenchant is more critical than that of an oil.
ANSI/AGMA B89 (R) – Gear Materials and Heat Treatment Manual
Vanadium content of 0. The peening time required to obtain percent coverage should be recorded. Approximate maximum diameter of the various types of round stock, depending upon steel mill capacity, is as follows: Minor discontinuities in finish machined teeth, if present, are often contour ground for removal, in preference to cosmetic weld repair.