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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Although several powder metal materials are available, alloy steel is usually specified for gear applications. Care should be exercised to maintain surface integrity during cooling or in tempering for subsequent machining.
Incoming Material Mechanical Tests. Subscription pricing is determined by: Open die forgings may be specified to be upset forged to increase center densification. This section covers the selection and processing of materials, hardnesses obtainable, and definitions and inspection of depth of hardening.
Austempering is applied to steels and, more recently in the development stage for ductile iron gearing refer to 4. Shoulders Reliance Electric Deceased M. The minimum surface stock removal varies with stock size and type of mechanical working.
ANSI-AGMA 2004-B89-1995 Gear Materials and Heat Treatment Manual
Chemical analysis shall be in conformance with the type specified or as agreed to by the gear manufacturer and casting producer. The temperature at which a change in microstructure phase occurs. Cementite is a hard microstructure phase otherwise known as iron gama Fe3C and characterized by an orthorhombic crystal structure. Case depth should be determined on a normal tooth section, using an appropriate superficial or microhardness tester.
Depth of hardening is dependent upon hardenability, section size and heat treat considerations. Copper Base castings are heat treated as required to obtain the specified mechanical properties.
Material selection and heat treat condition prior to flame or induction hardening significantly affects the hardness and uniformity of properties which can be obtained. The amount of bow is measured in inches with a gauge and is called the arc height see Fig Surface Hardness is the hardness measured directly on the surface. However, residual stresses 20004-b89 quench and tempering may be relieved at the nitriding temperature, causing distortion. However, normalized is preferred.
Data infers a HB minimum core hardness. Designers often interpret this to mean that minimum hardness is to be obtained at the roots 20004-b89 teeth for gear rating purposes. Gas pressure and mixing of heating gases must be uniform.
This is defined 2004-89 the depth at which the hardness is 10 HRC points below the minimum specified surface hardness. This layer should be removed from critical gearing surfaces. Gray iron contains typically over 3. The higher the alloy abma with high carbon, the greater the agmx for cracking. This is accomplished by shot peening several strips at various times of exposure to the shot stream and plotting the resulting arc heights.
Data contained herein represents a consensus from metallurgical representatives of member companies of AGMA. The combined carbon in pearlite will readily dissolve at the austenitizing temperature. Surfaces other than the tooth flanks and roots may tolerate greater stock removal.
The ion nitride process uses ionized nitrogen gas to effect nitrogen penetration of the surface by ion bombardment. Exception may be made for coarser pitch gearing with cases 0.
Repeatabiltiy becomes more difficult with agmz hardening. In these instances, hardness may be lower at the ends, particularly at the root area. These heat treatments produce ferritic, pearlitic or martensitic structures.
Masking can also be used for ease of straightening. Heat treated powder metal alloys have tensile amga of to ksi MPa with elongations of 1.
Tensile test afma should be poured from the same ladle or heat and be given the same heat treatments as the castings they represent.
The purpose of this Section is to establish methods for specifying carbonitrided gearing. Carburized gearing is used in enclosed gear units for general industrial use, high speed and aerospace precision gear units and also large open gearing for mill applications.
Heller Peerless Winsmith D. For example, hardness tests, or any nondestructive tests such as magnetic particle inspection or dye penetrant inspection, including the frequency of testing. Tolerancing must consider these changes.
[PDF] ANSI-AGMA B Gear Materials and Heat Treatment Manual – Free Download PDF
Core hardness is an important consideration for bending and impact strength. At times, it is desirable to mask finished machined areas of the part from shot impingement.
Through hardened gearing applications generally use,and type steels. Table gives hardness guidelines for some steel grades. The carburized case depth referred to in this Manual will be effective case depth. This depth may be measured by analyzing the carbon content or estimating based on microstructure.
Agka torch type flame heads are also used to manually harden teeth. Quench time and temperature are critical and inspray quenching, pressure velocity and direction of the quench media must be considered. Hardness survey is preferred for contral purposes.