I,OCA TlONAl EFFECT OF JOB MATERIAl, ON BtlE

CHAPTER-FOUR

4.6 I,OCA TlONAl EFFECT OF JOB MATERIAl, ON BtlE

In course of the experimentation it wa~ observed that for the same tool gcomelry and cutting conditIOns BUE height was diffcrent The height of BUE was found to greater in the experiments of the later stage (Flgurc 4.5-4.8). In this case no other parameter except the diametcr of job wa, reduced due to the continuous machIning of the cylindrical Job. This phenomcnon can be altnbuted to the variation in property of the job material along the radial directIon. Ductility of the inner region orthe job remains high and as a result the RUE height was of higher magnitude.

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It wa, ~ccn in Figure 4 5 that height of BUE decrea~c~ continuously from ^(~=50 to 250 and then decreases slowly for y =_70 For Y=_50 height of SUE increases ljI= 50 to 250 and maximum at ljI= 250 and after then decreases continuously, For (~~ _30 It was ,ccn that heIght of 13UE incrcases from (~- 50 to 150 and than decrea>cs sharply from ^ljI- 150 10 250 amllhen decreases continuously By analy;dng the new experiments It IS evident thaI height orBUE ISgrcatcr in new cases_

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Figure 4.6: El1ect of variation in job diameter on Ihe height of RUE

From figure 4,6 it was seen that for III= 15° heIght ofBUE increa.~cs ,harply from y ~ -I()O to -So and maximum at y ~ _50. After then decrease;; sharply from y ~ _50 to 00 then slowly from 0° (0 50, For III⁼250 height of HUE increases trom y= _100 to _70 and maximum at y ~ "7°. then decreases ,harply from y ~ _70 to _Jo then decreases very slowly. Now for III=

450 it was >cen that heIght ofBUE sharply from y⁼-100 to _70 and then slowly up toy - ()O After then it was increase, up to 50. It is evident that height of BUE is hIgher in each case of new experiments_

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Figure 4.7_ Effect of Job diameter on BUE as Side Cutting Angle is changed

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From figure 4,7 it was observed that for '{=_70 height of BUE decreases sharply from lp ~ 8° to 160 and then all most same up to 320. For y=_50 height of

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mcreascs from lp=80 to 160 aod then decrease, sharply from ^(~= 160 to 320. Now for '{⁼ _30 height of BUE decreases gradually_ Companng to new experiments ;1 IS observed thlll height of BUE is higher new ease than the previous experiments,

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Figure 4.8: Effeet or Job diameter on RUE as Rake Angle is chanj,'IXl

Now from llgure 4 8 i( was observed that for (jl~ 150>height of RUE increases sharply from y ~ ^{_81'1 ((l} _40 then maximum y=-40. Aller then it was decreases gradually, For <p=25u height uf I3IJE decreases sharply from y - _80 10 _40 and then gradually up to y=40. For

<jl=45" height of IjUE decreases gradually frum y⁼ _8010 -40 and then increase y⁼ -4°10 -'40 Comparing tu new experiments it is observed that height uf !lUE is higher new case than the previous experiments.

4.7 tnS<:lISSIONS

The first on.ler model of height of RUE (h) was developed by utilizing the least squares method The parameters of the model were calculated with the help of the following equation:

Thc mathematical model for the height (h) ofBUE could develop by substitutmg the model par-~meters as:

,'-11483 - O.II025x, - 0,0475 x,

Th,s prcdlcllon cquation IS plotted In Figure-4.9. From ligure_4.'l il is seen Ihal for a pameular height of I3UE. principal side eutllng angle ha~ much influence at lower rake angk bllt at higher rake angle, prinCipal side cutting angle has very httle intlllencc i,e. at almost zero influence. For a partIcular value of rake angle, If principal side cultlng angle' increases thcn height of RUE decreases and this continues from y =.200 to +200 After this with the

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Increa~e prinCipal ,lde cutting anglc, hcight of BUE remain constant. For a particular valuc of pnncipal side cllltmg anglc, height ofBUE increases with increase ofrakc angle.

Now from Ftgurc-4.2 and rigure-4 4 1\is !leen that height ofBUE i~ mifllmum at^([I = 450 and y - _)0 to +20. !lllcr then \t wa~ decreases gradually. For ([1=250height of BUE decreasc~

,hmply from y ~ _ROto _40 and then gradually up to 40. For (~= 450 hClght of HUE decreases gradually fromy - -So to -40 and increase~ from y = -40 to +40.

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A, p""ented 'n FIgure 45to Figure 4.8, il was observed that height of SUE was highcr in each case of se<:ond Figure;; than that of first Figures. It was almost double in second case than in first case, There 'Nere various cases of it. Heat treatment, intem31 propertll;:S of the job, gram size etc were rCSJXlosiblefor thIs. After heat treatment of a job, its outer surface

was harder than inner surlace, Wben turning operation was done on

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height ofBVE l.e. less BUE was form and height of BUE was 31so low. In thc opposite when same operallOn was done on the same solid job at the same condition at inner surfacc

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was observed tbat height of FlUE was higber in this case compare 10 outer surface, Ductility mcrcases from outcr surface to inncr surface and grain size was also largcr inner surface then ltl oulcr SUrf3cedue to he3t trcalmcnt. So job matenallS also 3 factor for FlUE iOrmation,