Authors: Paul W. Niskanen, Alion Science and Technology, Bruce Hansen, Sikorsky Aircraft<\/p>\n
Corporation and Lane Winkelmann, REM Chemicals, Inc.<\/p>\n
The high performance required from aerospace gears places stringent requirements upon the metallurgical<\/p>\n
quality, geometry, and surface finish of mating parts. In an effort to meet their mission requirements,<\/p>\n
2005 FTM 5<\/p>\n
aerospace gears are often engineered to operate near the upper bounds of their theoretical design<\/p>\n
allowables. Due to this, scuffing is a primary failure mode for aerospace gears.<\/p>\n
It was previously shown that specimens having an isotropic superfinish using chemically accelerated<\/p>\n
vibratory finishing had an improved performance inRolling\/Sliding Contact Fatigue (R\/SCF) testing. Isotropic<\/p>\n
superfinishing improved R\/SCF resistance up to nine times that of baseline test specimens. These tests also<\/p>\n
demonstrated the ability to successfully carry 30 percent higher loads for at least three times the life of the<\/p>\n
baseline samples.<\/p>\n
A study was then conducted on actual gears having an isotropic superfinish. This study showed isotropic<\/p>\n
superfinishing technology increased a gear's resistance to contact fatigue by a factor of three, and increased<\/p>\n
bending fatigue resistance by at least 10 percent. This increase in gear performance translates to reduced<\/p>\n
operation and sustainment costs, and also offers the potential for weight reduction in new transmission<\/p>\n
designs.<\/p>\n
The present paper will discuss an additional study which is underway to determine and compare the scuffing<\/p>\n
resistance of isotropic superfinished aerospace gears to that of baseline ground gears. Sample gears were<\/p>\n
made from case carburized SAE 9310. These tests were conducted using a method that progressively<\/p>\n
increases lubricant temperature until scuffing occurs, rather than the traditional load increasingmethod used<\/p>\n
in FZG testing rigs. The results of the current testing reveals that isotropic superfinished SAE 9310<\/p>\n
specimens show at least a 40 F higher lubricant temperature at the point of scuffing compared to as–ground<\/p>\n
baseline gears. Based on these results and the previous studies, it was concluded that this isotropic<\/p>\n
superfinishing technology should be incorporated in all future aerospace gear designs. A later paper will<\/p>\n
report on similar scuffing testing performed onAMS 6308 gears due to run–outs achieved by both the baseline<\/p>\n
and isotropic superfinished samples during the current procedure.<\/p>\n","protected":false},"excerpt":{"rendered":"
Evaluation of the Scuffing Resistance of Isotropic Superfinished Precision Gears<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n AGMA<\/b><\/a><\/td>\n 2005<\/td>\n 12<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":485827,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2659],"product_tag":[],"class_list":{"0":"post-485818","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\/485818","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\/485827"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=485818"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=485818"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=485818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}