{"id":486260,"date":"2024-11-05T12:13:12","date_gmt":"2024-11-05T12:13:12","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/agma-6115-a13\/"},"modified":"2024-11-05T12:13:12","modified_gmt":"2024-11-05T12:13:12","slug":"agma-6115-a13","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/agma\/agma-6115-a13\/","title":{"rendered":"AGMA 6115-A13"},"content":{"rendered":"<p>\n<u><strong>SCOPE<\/strong><\/u><\/p>\n<p>\tThis Standard provides a method for determining the power rating of gear sets used in main mill drives, pinion stands, and combination units used for the reduction of material size in metal rolling mills.\u00a0<\/p>\n<p>\n<strong>Applicability<\/strong><\/p>\n<p>\tApplications include but are not limited to, hot mills and cold mills, roughing and finishing stands:\u00a0 reducing, increasing, and 1:1 ratio sets.\u00a0 Auxiliary drives, including drives listed in ANSI\/AGMA 6113-A06, such as bridles, coilers, uncoilers, edge trimmers, flatteners, loopers (accumulators), pinch rolls, scrap choppers, shears, and slitters are not covered by this document.\u00a0<\/p>\n<p>\tThis standard includes a method by which different gear tooth designs can be rated and compared at extended life cycles typical for these applications, up to 175 000 hours.\u00a0<\/p>\n<p>\tExtended face widths in excess of the 1016 mm limit contained within ANSI\/AGMA 2101-D04 and ANSI\/AGMA 6113-A06 are accommodated.\u00a0 Single helical designs with face widths as large as 1520 mm and double helical designs with effective face widths as large as 2290 mm are not uncommon in these applications.\u00a0 A calculation method is included for the load distribution factor, <em>K<\/em><sub>HR<\/sub>, using a modification to the factors defined in ANSI\/AGMA 2101-D04 for these extended face widths.\u00a0<\/p>\n<p>\tThe standard addresses the range of load spectra experienced by these drives and defines load sharing for two and three high mill pinion stands.<\/p>\n<p>\n<strong>Rating formulae<\/strong><\/p>\n<p>\tThe formulae included determine the allowable fatigue ratings for pitting resistance and bending strength of steel gears with machined single or double helical external involute gear teeth only.\u00a0 Use of these formulae does not assure the performance of assembled gear drive systems, as numerous other design and operational factors are involved that are beyond the scope of this document.<\/p>\n<p>\tThe formulae evaluate gear tooth capacity as influenced by the major factors which affect gear tooth pitting and gear tooth fracture at the root fillet, when operating within design criteria for alignment and lubrication.<\/p>\n<p>\tWhere empirical values for rating factors are given by curves, curve-fitting equations are provided to facilitate computer programming.\u00a0 The constants and coefficients used in curve fitting often have significant digits in excess of those inferred by the reliability of the empirical data.\u00a0 Experimental data from actual gear unit measurements are seldom repeatable within a plus or minus 10 percent band.<\/p>\n<p>\tThis standard is intended for use by experienced gear designers capable of selecting reasonable values for the rating factors.\u00a0 It is not intended for use by the engineering public at large.\u00a0 Values for factors assigned in other standards are not applicable to this standard nor are the values assigned in this standard applicable to other standards.\u00a0 Mixing values from other standards with those from this standard could lead to erroneous ratings.<\/p>\n<p>\tThe gear designer or manufacturer is not responsible for the total system unless such a requirement is clearly identified in the contractual agreement.\u00a0<\/p>\n<p>\tIt is imperative that the overall system designer be satisfied that the system of connected rotating parts is compatible, free from critical speeds and from torsional or other vibrations within the specified speed range, no matter how induced.<\/p>\n<p>\n<strong>CAUTION<\/strong>: Compliance with this standard does not constitute a warranty of the rating of the gear set under installed field service conditions.<\/p>\n<p>\n<strong>Limitations<\/strong><\/p>\n<p>\tThe formulae of this standard are not applicable to other types of gear tooth deterioration such as wear, case crushing, and welding.\u00a0 They are also not applicable when vibratory conditions exceed the limits specified for the normal operation of the gears, see ANSI\/AGMA 6000-B96.<\/p>\n<p>\tThis standard is not applicable when any of the following conditions exist:<\/p>\n<ul>\n<li>\n<p>\t\tTransmission accuracy level, <em>A<\/em><sub>v<\/sub>, is more than 10 (<em>Q<\/em><sub>v<\/sub> less than 7);<\/li>\n<li>\n<p>\t\tTeeth have been surface hardened by nitriding or flame hardening;<\/li>\n<li>\n<p>\t\tTransverse contact ratio, <em>m<\/em><sub>p<\/sub>, is greater than 2.0;<\/li>\n<li>\n<p>\t\tModule is smaller than 5;<\/li>\n<li>\n<p>\t\tTeeth are damaged, e.g., cracked, worn, pitted, scuffed or plastically deformed;<\/li>\n<li>\n<p>\t\tInterference exists between tooth tips and root fillets;<\/li>\n<li>\n<p>\t\tTeeth are pointed. For most designs covered by this standard, pointed teeth are defined as those with normal chordal top land thickness, <em>s<\/em><sub>an<\/sub>, less than 0.25\u00a0<em>m<\/em><sub>n<\/sub>. Smaller top lands require additional review;<\/li>\n<li>\n<p>\t\tOperating backlash is insufficient;<\/li>\n<li>\n<p>\t\tNormal gear mesh temperature is less than 0\u00b0C or greater than 120\u00b0C.<\/li>\n<li>\n<p>\t\tUndercut exists in an area above the theoretical start of active profile.<\/li>\n<li>\n<p>\t\tThe root profiles are stepped or irregular.\u00a0 The <em>Y<\/em><sub>J<\/sub> factor calculation uses the stress correction factors developed by Dolan and Broghamer [1].\u00a0 These factors may not be valid for root forms which are not smooth curves.\u00a0 For root profiles which are stepped or irregular, other stress correction factors may be more appropriate.<\/li>\n<\/ul>\n<p>\tScuffing criteria are not included in this standard.\u00a0 A method to evaluate scuffing risk can be found in AGMA 925-A03.<\/p>\n<p>\tDesign considerations to prevent fractures emanating from stress risers on the tooth profile, tip chipping, and failures of the gear blank through the web or hub should be analyzed by general machine design methods.<\/p>\n<p>\n<u><strong>FOREWORD<\/strong><\/u><\/p>\n<p>\t[The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of ANSI\/AGMA Standard 6115-A13, <em>Power Rating of Single and Double Helical Gearing for Rolling Mill Service (Metric Edition)<\/em>.]<\/p>\n<p>\tThe first AGMA standard for rolling mill gearing was AGMA 323.01, October 1969, <em>Helical and Herringbone Gearing for Rolling Mill Service<\/em>.\u00a0 The first draft of this standard was prepared in December 1967.\u00a0 It was approved by the AGMA membership and became an official AGMA Standard in August 1969.<\/p>\n<p>\tIn February 1979, the Mill Gearing Committee was reorganized to review the Standard and revise it in accordance with a proposed new standard for <em>Rating the Pitting Resistance and Bending Strength of Spur and Helical Involute Gear Teeth<\/em>.\u00a0 This new standard became AGMA 218.01 in December 1982.\u00a0 With AGMA 218.01 as a guide, the committee submitted the first draft of ANSI\/AGMA 6005-B89 in 1984.\u00a0 It was approved by the AGMA membership in February 1989 and supersedes AGMA 323.01, <em>Helical and Herringbone Gearing for Rolling Mill Service<\/em>.<\/p>\n<p>\tIn 2002, AGMA 6005 was withdrawn to facilitate the creation of an update based on the then current standard <em>Rating the Pitting Resistance and Bending Strength of Spur and Helical Involute Gear Teeth<\/em>, ANSI\/AGMA 2101-C95.\u00a0<\/p>\n<p>\tThe purpose of ANSI\/AGMA 6115-A13 is to provide a method for determining the power rating of gear sets used in main mill drives, pinion stands, and combination units for metal rolling mills.\u00a0 This standard was written to address the fundamental differences between typical enclosed drive applications and rolling mill applications.<\/p>\n<p>\tIn June 2005 the Mill Gearing Committee began work on ANSI\/AGMA 6115-A13 derived from ANSI\/AGMA 2101-D04 and ANSI\/AGMA 6005-B89.\u00a0 Changes to the standard include a method by which different gear tooth designs can be rated and compared at the extended life cycles typical for these applications.\u00a0 Face widths in excess of the 1016 mm limitation contained within previous standards are also accommodated, as is a calculation method for load distribution factor, <em>K<\/em><sub>HR<\/sub>, at these extended face widths.\u00a0 The standard addresses the range of load spectra experienced by these drives and defines load sharing for two and three high mill pinion stands.<\/p>\n<p>\tThe stress cycle factor for pitting resistance, <em>Z<\/em><sub>NR<\/sub>, consists of a single curve above 10<sup>7<\/sup> cycles, and its value has been modified based on current practice.\u00a0 The stress cycle factor for bending strength <em>Y<\/em><sub>NR<\/sub>, consists of two curves above 10<sup>7<\/sup> cycles, one for gears with shot peened roots, and the other for gears with untreated roots.\u00a0 Below 10<sup>7<\/sup> cycles, both <em>Z<\/em><sub>NR<\/sub> and <em>Y<\/em><sub>NR<\/sub> are assigned value of unity.\u00a0 In addition, the surface condition factor for pitting resistance, <em>Z<\/em><sub>R<\/sub>, is assigned values other than 1.00 depending on the composite surface finish of the tooth flanks of both mating elements, and a new surface condition factor for tooth root bending, <em>K<\/em><sub>TRF<\/sub>, has been created and is assigned values depending on the surface finish for the tooth root fillets of the gear in question.<\/p>\n<p>\tAnnexes are included in this standard to give guidance on service factors, shaft design, blank configuration and others.<\/p>\n<p>\tThis AGMA Standard and related publications are based on typical or average data, conditions, or applications.\u00a0 The Association intends to continue working to update this Standard and to incorporate in future revisions the latest acceptable technology from domestic and international sources.<\/p>\n<p>\tThe first draft of ANSI\/AGMA 6115-A13 was made in July 2012.\u00a0 It was approved by the AGMA membership in August, 2013.\u00a0 It was approved as an American National Standard on September 23, 2013.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Power Rating of Single and Double Helical Gearing for Rolling Mill Service &#8211; Metric Edition<\/b><\/p>\n<table style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/agma\/\"><b>AGMA<\/b><\/a><\/td>\n<td>2013<\/td>\n<td>67<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":486267,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2659],"product_tag":[],"class_list":{"0":"post-486260","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-agma","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/486260","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/486267"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=486260"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=486260"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=486260"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}