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. - 1 ;-\ f E.G D • C ACE AD DD f AE DE ~D o\Bf I!.f H BD BC B Fa AD AB C CD BD Sf 8E ~c- CG -- CE Of TECHNOLOGY IFOCUS, Normal Probability Plot of the Standardized Effects (Response is Time to .Alpha = 0.10,. Only 30 Largest 'Eflieets Shownl o 2 4 Figure 3-Pal'eto A CQ"d~i.n .1 -A-' _ .. of Effects. Interaction 6 12 Plot ~Data Means) for Time to I;nitiation -1 1 ·1 , -1 r -1 1 ·1 I -1 B Allcy -I 9' • 1 ,1111-1 Figure 4-1llteractioll .~ "'" :e .E B ~ Figure 3-Main Plot.. Effects Plot. C HT Condo ·1 •I 1!!!·'1 , 0 Minutes Ex I. .··1 " : _- IIIE Concentration Main iEff,eets Plot ([lata Means) for lime to Initiation .A: .ACondition B:BAlloy C : C HI Condition D: 0 Minute E : E Concentration F : Flemperatllre G: G Coolant Type ~_;JI ~ 1500 1000 500 1500 38 JULY/AUGUST 2002' GEAR TECHNOLOGY' www.geartechnoJogy.com· www.powertransmJss on.com ~ ~ ~ -- .---1 FTemperitllre 1 .........---. ~ ,
Acreening analy is was performed by 'olti'ng the hours 10 initiation in ascending order and evaluating tile experiment matrix for any pattern. The visual pattern shown in Figure I that appeared 10 be . igniflcam i : coelam type. coolant condjtion, and an interaction between eoolaru concentration and coolant type. A taJislical aaalysis was next performed, The normal probability plot and the Pareto of effects shown in Figure 2 and Figure 3 respectively, identified 'the same facto as being significant. Figure 4, the interaction plot, 'howed the coolant type by coolant concentration as the mo t significant interaction in the model. The main effects pI. t. Figure 5, indicated that coolant concentration and coolant type had the greatest effect. An analysis of variance (ANOVA) confirmed the re uljs reported above as statistical I.)' ignificam, Based on tile data. virgin and low concentration coolants are predicted to initiate corrosion more quickly than reclaimed and higher coacentration coolants. Heal treat condition alsoaffected the initiation of corm. ion in that rugh carbon (carburizeCl) urface were more resi tanl 110 initiation as compared '10 core (unearburized) wfaces. It was also, ynthesized from. the data set '!hat u ed/reclaimed cool ants offered better corrosion resi tance IhI: !'I.I_~11OI\I WW... pOWllr,,"n,mluUM.com •.......... g .. "·.chnology.com • GEAR TECHNOLOGY" JUl Y/AUGUST 2002 39
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