ASME B29.22:2001 pdf download

ASME B29.22:2001 pdf download.DROP FORGED RIVETLESS CHAINS, SPROCKET TEETH DRIVE CHAIN/DRIVE DOGS
2 DEFINITIONS
drop forged rivetless chain: chain made from drop forged steel parts that are heat treated and are propor- tioned for high strength and comparative light weight. Its simple design permits assembly or dismantling by hand and this chain is available in three general types as illustrated and described (see regular drop forged rivetless chain, X-type chain, and modified X-type riv- etless chain). Numerous attachments are available to suit a wide variety of applications including trolley conveyor service. pin: part forged symmetrically with T-heads on both ends that lock into the sidebars (see Fig. 1). regular drop forged rivetless chain: chain used for general applications where minimal side flexing is required (see Fig. 2). Attachments are available for mounting on center links or on extended pins. sidebar: part made with a center panel that acts as a shield to reduce material falling through the link and provides strength. The center panel is provided with a center drainage hole (see Fig. 3).X-type chain: chain with greater side-flexing capabili- ties compared to regular chain (see Figs. 3 and 4). modified X-type rivetless chain: chain with the same feature as X-type (see Fig. 4); additionally, modified X-type has a controlled area, C, on the center link that helps prevent movement of attachments, which may be mounted to the center link (see Fig. 5, dimension C.)
3 MINIMUM ULTIMATE TENSILE STRENGTH
Minimum Ultimate Tensile Strength (M.U.T.S.) for chains covered by this Standard, is the minimum force at which an unused, undamaged chain could fail when subjected to a single tensile loading test. (a) WARNING: The minimum ultimate tensile strength is NOT a “working load.” The M.U.T.S. greatly exceeds the maximum force that may be applied to the chain. (b) Test procedure. A tensile force is slowly applied, in uniaxial direction, to the ends of the chain sample. (c) The tensile test is a destructive test. Even though the chain may not visibly fail when subjected to the minimum ultimate tensile force, it will have been dam- aged and will be unfit for service. The values adopted for this Standard are for heat- treated medium carbon steel chain only. Medium carbon steels not in the heat-treated condition are not covered by this Standard. Chains produced of other materials not covered in this Standard (alloys, stainless steel) or by casting or fabricating will also have significantly different values of M.U.T.S.
10 SPROCKETS
Two sprocket tooth forms are included: Forms A and B. The major difference between these two forms is in the method of generating the tooth form. Form A produces a curved tooth face and Form B a straight tooth face. Either form may be used. See Tables 5, 6, and 7, and Figs. 6 and 7. 10.1 Sprocket Tooth Form Data Root diameter (D r ), pocket radius (R p ), and outside diameter (D o ) must not exceed the values obtained by the formulae. Oversize dimensions may cause improper chain and sprocket interaction and excessive chain loads (see Fig. 6). In some cases the outside diameter (D o ) may be limited by special attachments mounted on the chain. For this reason, the outside diameter (D o ) should be checked to assure that interference does not exist. D o obtained by the formula should be rounded off to the next smallest 1 ⁄ 8 in. (3 mm). Chain clearance circle (C c ) established by the formula is the maximum and will provide clearance under most conditions. However, the value obtained by the formula should be checked to assure that a given hub diameter does not interfere with chain attachments.