AGMA 04FTM7-2004 A Short Procedure to Evaluate Micropitting Using the New AGMA Designed Gears《用新AGMA设计齿轮评估微小蚀损的短期程序》.pdf
《AGMA 04FTM7-2004 A Short Procedure to Evaluate Micropitting Using the New AGMA Designed Gears《用新AGMA设计齿轮评估微小蚀损的短期程序》.pdf》由会员分享,可在线阅读,更多相关《AGMA 04FTM7-2004 A Short Procedure to Evaluate Micropitting Using the New AGMA Designed Gears《用新AGMA设计齿轮评估微小蚀损的短期程序》.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、04FTM7A Short Procedure to EvaluateMicropitting Using the New AGMADesigned Gearsby: Dr. K.J. Buzdygon and Dr. A.B. Cardis, Exxon-MobilResearch and Engineering CompanyTECHNICAL PAPERAmerican Gear ManufacturersAssociationA Short Procedure to Evaluate Micropitting Using theNew AGMA Designed GearsDr.Kev
2、inJ.BuzdygonandDr.AngelineB.Cardis,Exxon-MobilResearchandEngineering CompanyThe statements and opinions contained herein are those of the author and should not be construed as anofficial action or opinion of the American Gear Manufacturers Association.AbstractEncouraging results from a prototype mic
3、ropitting test using specially designed gears (20:30 tooth ratio, tiprelief, and a 560 mm radius pinion crown) on the standard FZG test rig were reported at the 1998 AGMA FallTechnical Meeting. Subsequently, the authors company purchased several sets of these experimentalAGMA test gears and attempte
4、d to develop a new test procedure to evaluate micropitting as an alternative toFVA Procedure 54. The new relatively short test procedure involves running the test gears on the standardFZGtestrigwithoilcirculationfor168hoursatloadstage10and1500rpm.The5-gallonreservoiroftestoiliskept at 60 C throughou
5、t the test. The oil is cleaned by an in-line filter (200 =6 m) before it is injected into thegear mesh at 2 liters/minute. At the end of test, the gears are rated for micropitting, weight loss, pitting, andscuffing. The most common damage mode was micropitting, with only occasional occurrences of pi
6、tting andno occurrences of scuffing. Other modes of failure such as gear tooth bending did not occur at theseconditions. The involute profile deviation of the gear teeth was not measured.FivecommerciallyavailableISOVG320gearoils,withperformanceintheFVAProcedure54micropittingtestranging from FLS 9-lo
7、w to FLS 10-High, were evaluated using this procedure. The degree of micropittingcoverage ranged from 34% to 7% in the new test procedure. Micropitting generally originated inthe middleofthe gear tooth, instead of the root or tip. Overall, there was excellent correlation of the degree of micropittin
8、gdamage between the new test procedure and FVA Procedure 54.Copyright 2004American Gear Manufacturers Association500 Montgomery Street, Suite 350Alexandria, Virginia, 22314October, 2004ISBN: 1-55589-830-01A SHORT PROCEDURE TO EVALUATE MICROPITTINGUSING THE NEW AGMA DESIGNED GEARSKevin J. Buzdygon an
9、d Angeline B. CardisExxonMobil Research and Engineering CompanyIntroductionThe American Gear Manufacturers Association(AGMA) has developed a new gear design for thestudy of surface fatigue life using the FZG geartest rig. The objective of the AGMA project is todevelop a gear surface fatigue life mat
10、hematicalmodel that will include lubricant and additiveeffects. Typical inspection properties oflubricating oils such as viscosity index, acidnumber, and elemental analysis are not asufficient basis for estimating the ability of thelubricant to provide protection from surfacedistress such as scuffin
11、g, pitting and micropitting. Pitting and micropitting are forms of rolling contactfatigue, which are strongly influenced by lubricantbase stock type and additive chemistry. Althoughmany studies have been reported over the years1,2, 3, the relationship still must be determinedthrough testing of each
12、oil formulation. Fewestablished methods are available to evaluatepitting and micropitting. One method that is usedto evaluate pitting is described in FVA InformationSheet No. 2/IV.11The most commonly used testto evaluate micropitting is described in FVAInformation Sheet No. 544(commonly called FVAPr
13、ocedure 54). This micropitting test can takeseveral months to complete, and therefore is notconvenient for the purpose of screening newtechnology. A screening test was developedusing a roller disc machine5. Althoughsuccessfully used to produce useful data, theequipment is not readily available and r
14、equiresskilled technical support to prepare testspecimens, run the test, and interpret results.Another test method was recently reported whichuses modified gear geometry and differentmetallurgy, but is run on the standard FZG testrig6,7. This test is run at only one load stage withrating after 100 h
15、ours and again after anadditional 300 hours. Although results reportedare promising, this test has not been widely usedperhaps due to limited availability of test gears. Aneed still exists in the industry for a reliable,simple, and widely available screening test formicropitting performance of lubri
16、cants.Two types of test gears are availablecommercially to evaluate pitting and micropitting.FZG Type C-PT test gears (16:24 tooth ratio,surface finish Ra=0.30.1 micrometers) are usedto test for pitting performance according to FVAInformation Sheet No. 2/IV. FZG type C-GF gears(16:24 tooth ratio, su
17、rface finish Ra=0.50.1micrometers) are used to test for micropittingaccording to FVA Information Sheet No. 54. Hhnet. al.12provide a detailed summary of the varioustest gears used in pitting, micropitting, andscuffing tests. The AGMA prototype test gearsare somewhat different, with a 20:30 tooth rat
18、io,and surface finish Ra=0.5-0.8 micrometers. TheAGMA gears are designed with tip relief, whichthe FZG Type C-PT and C-GF gears do not have.The tip relief is meant to avoid hard contact at thetips of the gear and pinion teeth. The AGMAgears are also CBM form finished, whichproduces a different surfa
19、ce texture compared tothe other types of gears. Additional design detailsof the AGMA test gears are provided elsewhere8.The AGMA test gears represent modern gearingdesign more closely than FZG Type C-PT or C-GF gears8. Results of prototype testing of thenew AGMA test gears were reported at the 1998A
20、GMA Fall Technical Meeting9. Additionalinformation about the test design and initial testresults can be obtained from AGMA8,9,10.A subsequent batch of AGMA test gears wasproduced and limited quantities were madeavailable to interested organizations with theunderstanding that test results would be re
21、portedto AGMA in generic form. M. Hoeprich13conducted a study using the AGMA test gears in ashort duration, high load test (load stage 12).Even though the test ended early due to toothbreakage, important information regarding thedetailed failure mechanism was derived fromstudy of the other teeth. Si
22、gnificant micropittingand pitting were observed on the pinion and gearteeth13. 2In 2001, the authors company purchased a smallnumber of these test gears. Since the companysexpertise is better aligned with lubricant testingthan metallurgical evaluations, it was decided todevelop a short lubricant scr
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