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 hardness will also increase with increasing nitride case depth. An upset forging is produced when the billet is initially hot worked in one direction, and then is rotated 90 degrees and hot worked again. Quantity must be a positive whole number. Flank or root and flank induction scan hardening contour can be applied to almost any tooth size with appropriate supporting equipment and kW capacity. Service aagma can usually furnish these materials in small quantities and with short delivery time from their inventories.
Case Hardness is the micro–hardness measured perpendicular to the tooth surface at a depth of 0. Austempered Ductile Iron ADI is a ductile iron with higher strength and hardness than ayma ductile irons. A wide variety of materials can be flame or induction hardened, including cast and wrought carbon and alloy steels, martensitic 2004-b98 steels, ductile, malleable and gray cast irons.
Cementite is a hard microstructure phase otherwise known as iron carbide Fe3C and characterized by an orthorhombic crystal structure. Suggestions for the improvement of this standard ama be welcome. Rockwell C hardness measurements are made along the length of the bar on ground flats in one sixteenth of an inch 1. Quenching, distortion, and shot peening are discussed.
Those testers which produce Diamond Pyramid or Knoop hardness numbers gram load are recommended. Repair welding in the tooth portion should only be performed with the approval of the gear purchaser.
ANSI-AGMA 2004-B89-1995 Gear Materials and Heat Treatment Manual
The powder metal process is wellsuited to the production of gears for several reasons: The upper and lower dies trap the steel billet in a closed confined cavity and the press action deforms the metal to fill the die cavity, producing a more exact contoured forging.
Parts heated in an induction coil are usually quenched in an integral quench ring or in an agitated quench media. Gear rims are normally forged or rolled rings, formed alloy plate, or, less frequently, cast. The following sections describe items that the designer should include in a shot peening specification. However, residual stresses from quench and tempering may be relieved at the nitriding temperature, causing distortion.
Test bars should be of the same steel type as the gear sbut not necessarily the same heat. Carburizing grades are usuallyand types. Smaller sections can be processed in well agitated oil.
Castings generally being isotropic nondirectionality of propertieswhen sound in the rim tooth section, can provide comparable mechanical properties to those aagma forgings.
Hardness in this area will be substantially lower.
Weld repair in the tooth portion may require notification of the purchaser. A commonly referenced shot peening specification is MILSB which identifies materials, equipment requirements, procedures, and quality control requirements for effective shot peening. The size of the cast test coupon is dependent upon the thickness of the tooth portion of the casting as follows: Maximums may be specified for induction hardened parts.
Steels purchased to predicted hardenability ranges are called HBand steels. Good response in well agitated conventional oil or polymer. They are typically available as hot rolled, hot rolledcold drawn, hot rolledcold finished and forged rounds. Material specifications are issued by agencies, including the government, large industrial users, and technical societies, some of whom are: The controlled porosity in powder metal parts permits their impregnation with oil to provide a self lubricating part, especially for the internal type of gears.
If the document is revised or amended, you will be notified by email. Spin hardening of finer pitches is also required when using flame burners. Bores and web sections can be masked to prevent carburizing, and enable subsequent machining.
Mechanical Property Test Bar Considerations. The bar is placed in a fixture, then quenched by spraying room temperature water against one end face.
Item Detail – ANSI/AGMA C08 (reaffirmed March )
Induction hardening employs a wide variety of inductors ranging from coiled copper tubing to forms machined from solid copper combined with laminated materials to achieve the required induced electrical currents. Forged or hot rolled die generated gear teeth, with the direction of inclusion metal flow parallel to the profile of teeth, result in the optimum direction of inclusions for gearing.
Variables in the nitriding process are the combined effects of surface condition, degree of ammonia dissociation, temperature, and time of nitriding. Flame and induction hardening have been used successfully on most gear types; e. Although this process is much more costly than the conventional powder metal process, it can still be cost effective for high production parts requiring higher mechanical properties than achievable using the standard process.
This information is intended to assist the designer, the 204-b89 and manufacturing engineer, and the heat treater to effectively produce the gearing required for the application.