ࡱ> c5@| bjbj22 XX6p   GGG8,H4`I %KLK(KKKLLLDFFFFFF$5RZju QLL Q Qj KKZZZ Qv <K KDZ QDZZ,Z^9\ | <K|K 2byGT hd0%tV< <LMZNIOLLLjj d)P4Yj P4OPTIMIZATION OF PARAMETERS OF TURNING PROCESS Dra~en Baji Ivan Majce Prof. dr. sc. D. Baji, University of Split, FESB, R. Boakovia bb, 21000 Split I. Majce, University of Split, FESB, R. Boakovia bb, 21000 Split Key words: longitudinal turning process, surface roughness, cutting parameters, mathematical modelling, optimization ABSTRACT The objective of this study was to investigate influence of cutting parameters on the surface roughness, during the longitudinal turning process. Detailed experiments according to the factors test plan and regression analysis, gave the extend equation for mean arithmetical roughness, as one of the most useful signs of the surface roughness. In other to get a minimum values of the surface roughness, optimization of the mathematical model is done by and optimal values of the examined factors are determined. The obtained results are, according to the experiment plan, valid for the testing of material 5431 (DIN 34CrNiMo6). The test results are to be probably applied to other materials, however, has to be proved for each separate case. 1. INTRODUCTION The development of new technologies, building and introduction of numerically controlled machine tools i.e. machine systems have significantly changed conditions and relation within production. The lack of reliable technological bases, necessary for machining systems programming, causes significant troubles for the successful exploitation of the present machining systems. There exists a misconception that in the present time of electronic computers it is not necessary to be well familiar with chip-forming machining, considering it obsolete. However, just under new conditions it is necessary to obtain new knowledge about regularities in chip forming machining, about cutting features of new, highly-productive tools, about machinability of workpiece material and so on. High reliability and efficiency which is required from modern machining systems directly depend upon the reliability of input data such as: material machinability, patterns of tool wear, optimal operating parameters, finished surface unevenness, chip formation of adequate size and so on. Due to this, research in this field is of great importance and highly developed countries invest lot o money in it. Surface roughness has a significant influence on exploitation characteristics of the part that carries the above-mentioned surface. Surface finish defined as average of mean deviation of the profile from the mean line, is important for tribologic behavior of workpieces in working conditions. On the other hand, an increased depth of surface roughness has a negative effect on dynamically loaded parts because of their notch impact that can cause a rupture of the part. Thus a knowledge of interdependence between depth of surface roughness and an average of mean deviation of the profile from the line is needed. 2. FACTORS THAT INFLUENCE SURFACE ROUGHNESS The roughness of the machined surface is seen through micro-geometrical irregularities of the surface. The evaluation of the quality of machined surface is based on the judgment of its roughness. Theoretical roughness depends exclusively on tools geometry and applied process of machining whereas a real roughness appears as the result of theoretical roughness though with bigger or lesser occasional roughness provoked by the many factors. The surface roughness is influenced by the most important factors such as: cutting parameters, tool geometry, build-up edge, process time, workpiece and tool material, tool wear, dynamical behavior of cutting system, appliance of coolants and lubricants. Cutting speed influence is associated to generation of build-up edge i.e. build-up edges influence on surface roughness of processed surface. At lower cutting speed (0,16-0,6 [m/s]), generation of build-up edge results with grater surface roughness. Increment of cutting speed results causes decrement of build-up edge influence that induces as reduction of surface roughness. With further increment of cutting speed, nature of particles separation changes, what results as decrement of plastic deformation causing surface roughness reduction. Unlimited increment of cutting speed doesnt influence roughness because it causes greater tool wear that keeps surface roughness approximately on the same level. Feed influences surface roughness directly proportional. Feed increment results as increment of surface roughness. However feed influence is related to cutting tool nose radius influence. Unlimited reduction of feed does not result with reduction of surface roughness. At some level, value of cutting tool nose radius prevents further reduction of surface roughness causing it to stay at minimum possible level. Cutting tool nose radius influences surface roughness inversely proportional. Increment of cutting tool nose radius value causes reduction of surface roughness. Reduction of surface roughness is limited with some minimal value. Further increment of cutting tool nose radius value causes vibrations that have negative influence in surface roughness. From geometrical perspective, the depth of cut doesnt influence surface roughness because it has no influence on size and form of bumps. However, influence of depth of cut is indirect trough generation of build-up edge, deformation of separated particles, cutting temperature, cutting forces, vibrations etc. Figure 1 shows influential factors on surface roughness regarding chip-forming machining.  EMBED CorelDRAW.Graphic.11  Figure 1. Fishbone diagram with the factors that affect surface roughness THE AIM, METHODOLOGY AND CONDITIONS OF EXPERIMENT Experiment aim is to define adequate mathematical model that is used to determine the influence of independent factors and cutting data, at surface roughness. The following independent factors are selected: cutting speed (vc), depth of cut (ap), and feed (f). For a concrete case, that means determination of criteria: surface roughness: Ra = f(vc, ap, f). Experiments are performed on lathe machine PRVOMAJSKA D-420/1500. Workpiece material is steel 34CrNiMo6 (DIN). The experiments are carried out by the tool for external machining, which consists of toolholder mark PTGNR 2020K 16 and insert mark TNMG 160408-PF4015. The SURTRONIC 3 instrument, produced by Rank Taylor Hobsen, has done the measurements of surface roughness. The multifactor design of the second degree has been used to carry out this experiment. Actually, in order to learn more about the maximum or minimum of the process or its function it is necessary to approximate it by the polynomial of the second rather than the polynomial of the first degree. The selected values of the cutting parameters are the following: cutting speed: vc,max = 2,0525 [m/s] vc,min = 0,821 [m/s] depth of cutt: ap,max = 1,2 [mm] ap,min = 0,6 [mm] feed: fmax = 0,28 [mm/r] fmin = 0,16 [mm/r]. Central composite design with empiric polynomial model of the second degree is taken:  EMBED Equation.3  (1) - b0, bi, bij, bii regression coefficient, x coded values of input parameters. In order to get regression equation determined by polynomial of the second degree using the statistics analysis, it is necessary to expand the design matrix with some other physic factor values or rather to increase the number of experimental points which is to get by rotatability character. Rotatability can be selected by an appropriate choice of coefficient, marked by (a value of which depends upon the number of the points of factorial design. For k=3 the given value of (a = 1,682. The needed experimental points number, as far as the design of the second degree is concerned, figure out the following:  EMBED Equation.3  (2) 2k  the design number within the basic points n0  the repeated design number of the average level, n0 = 6 na  the design number on the central axes, na = 6 Adding the points to the central axes where xi = (a, and (a = 1,682, the 3-factorial design can be presented in Table 1. Table 1. Physic values and coded indexes of input factors Input factorsCoded values of input factorsx-i(x-i,minx-i0xi,maxx+i(-1,682-10+1+1,682x1 = vc [m/s]0,4010,8211,43672,05252,4724x2 = ap [mm]0,40,60,91,21,4x3 = f [mm/r]0,120,160,220,280,32EXPERIMENTAL RESULTS, STATISTICS ANALYSIS AND OPTIMIZATION Measured values of surface roughness, as the results of testing twenty experimental points defined by experiment plan matrix, are shown in Table 2. The mentioned values of surface roughness are input data for mathematical modeling of results, which was made by multiple regression analysis and by using program package Design Expert 6. Table 2. Given results of the surface roughness measurements TEST NUMBERINPUTMeasured values Ra ((m(Calculated values Ra ((m(vc [m/s(ap [mm]f (mm/r(10,82100,60,164,104,1622,05250,60,162,702,7130,82101,20,163,553,5842,05251,20,162,102,1350,82100,60,285,105,1662,05250,60,283,773,7170,82101,20,285,305,3782,05251,20,283,923,9291,43670,90,223,783,78101,43670,90,223,803,78111,43670,90,223,813,78121,43670,90,223,793,78131,43670,90,223,783,78141,43670,90,223,793,78150,40100,90,225,875,75162,47240,90,223,303,32171,43670,40,223,553,55181,43671,40,223,303,25191,43670,90,122,492,42201,43670,90,324,784,75Regression analysis has shown which factors and interactions have had an important impact on the value of surface roughness. Applying repeated regression analysis the coefficient of regression, multi-regression factor, standard false evaluation and the value of t-test have been determined. Significant factors and interactions are as follows: vc, f, apf, vc2, ap2, f2, whereas non-significant ones are: ap, vc(ap, vc(f. On the basis of the applied regression analysis, the dependence of an average arithmetic roughness Ra and examined factors can be expressed as:  EMBED Equation.3  (3) with regression coefficient: r2 = 0,9963. The analysis of obtained mathematical models and cutting data influence at surface roughness has been made using diagrams shown in Figures 2, 3, 4, 5, 6, and 7.  Figure 2.- Surface roughness in dependence of cutting depth ap and cutting speed vc (fmin= 0,12 [mm/r])  Figure 3.- Surface roughness in dependence of cutting depth ap and cutting speed vc (fmx= 0,32 [mm/r])  Figure 4.- Surface roughness in dependence of cutting depth ap and feed f (vc, min= 0,4 [m/s])  Figure 5.- Surface roughness in dependence of cutting depth ap and feed f (vc, max= 2,47 [m/s])  Figure 6.- Surface roughness in dependence of cutting speed vc and feed f (ap,min= 0,4 [mm]) Figure 7.- Surface roughness in dependence of cutting speed vc and feed f (ap,max= 1,4 [mm])Given mathematical model (3), due to the applied regression analysis, is optimised the way that the model parameters such as: cutting speed, depth of cut and feed, assume the optimum values whereas the aim function, figured out through the average arithmetic roughness, gain the minimum value. The minimum aim function has been found out for the following cutting parameters: vc,opt = 2,2697 [m/s]; ap,opt = 1,4 [mm]; fopt = 0,12 [mm/r] for which the aim function or rather minimal value of the average arithmetic roughness is expressed as: Ra,min = 0,858 [m] .  Figure 8.- Surface roughness in dependence of cutting depth ap and feed f (vc, opt= 2,2697 [m/s]) 5. CONCLUSION Mathematical model presents quite well the performance of the average arithmetic roughness. However, it can be used as well for the evaluation of the surface roughness value in longitudinal turning work, whilst applying specific cutting parameters or as a useful model in selection of appropriate cutting parameters in order to achieve a specific demanding roughness. Relating to the given equation and diagrams it is worth to point out the following conclusions: Regression coefficient r2 which determines quality and reliability of model is 0,9963, what means that 99,63 % of variability is caused by impact of variables, meaning that mathematical model quite well describes correlation of surface roughness Ra, to selected input factors vc, ap, f . The increase of the cutting speed in a certain interval effects the improvement of the surface roughness but soon after, due to the layer on the cutting edge and vibrations, it deteriorates. The feed actually has the greatest impact on the surface roughness. The more it decreases the more it improves the surface roughness. The increase of depth of cut improves the surfaces roughness as well. This can be taken as an advantage for the improvement of productivity. 6. 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I 31-I 40. (2( BENARDOS, P.G.; VOSNIAKOS, G.-C..: Predicting surface roughness in machining: a review, International Journal of Machine Tools & Manufacture, 43 (2003), 833-844. (3( Bili, B.; Baji, D.; Ve~a, I.: Optimization of cutting parameters regarding surface roughness during longitudinal turning, 15th International DAAAM Symposium: Intelligent Manufacturing & Automation: Globalisation  Technology  Men - Nature, Vienna, 2004., str. 039-040. (4( CEBALO, R.: Ovisnost dubine hrapavosti o srednjoj aritmeti koj hrapavosti bruaene povraine kod razli itih postupaka bruaenja, Strojarstvo 35(5,6) 231-235 (1993). (5( MONTGOMERY, D.C.: Design and Analysis of Experiments, John Wiley & Sons, Inc., New York, 1997. (6( CEBALO, R.: Prepoznavanje materijala i automatsko odreivanje elemenata rezanja kod tokarenja, Zbornik II, Suvremeni trendovi proizvodnog strojarstva, Zagreb, 1992.      PAGE 4D. Baji, I. 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LIST\trfltrfdPPP???sumi8x$ , 7LyTDRAWPATTERNS bybySTREAMSLISTSummaryInformation(_1154939545Fbyby| CORELDRW1@@@x@myxCDRB FMicrosoft Equation 3.0 DS Equation Equation.39qOle  CompObjfObjInfoEquation Native M1J y=b 0 +b i "x ii=0k " +b ij1d"i"jk " "x i "x j +b iii=1k " "x i2_1172560525FbybyOle CompObjfObjInfo FMicrosoft Equation 3.0 DS Equation Equation.39q[Y N=2 k +n 0 +n  =20 FMicrosoft Equation 3.0 DS Equation Equation.39qEquation Native w_1208944301FbybyOle CompObjfObjInfo Equation Native !z1Table SummaryInformation( '^$ R a =4.66"3.202"v c +10.257"f+ 11.012"a p "f+ 0.705"v c2 "1.515"a p2 " 19.412"f 2Oh+'0pyj56,hR` `00hxcdd``^ @c112BYL%bpu t7\F@F_k;YP!P$w,*LqM#n yp_fE0~CA|}a N\NdM{ `PzĤ\Y\2C 2.u$$If!vh55#v#v:V 9406+,55/ / / / / 44 9f4T%$$If!vh555555#v:V 9406+,5/ / / / / / / 44 9f4T $$If!vh555555#v:V 9406+,5/ / / / / 44 9f4T $$If!vh555555#v#v:V 906,55/ / / / / 44 9T $$If!vh555555#v#v:V 906,55/ / / / / 44 9T $$If!vh555555#v#v:V 906,55/  / / / / 44 9TL$$If!vh5555#v#v#v:V l4 t0    +++,555/  /  / /  /  /  /  / /  f4Tj$$If!vh555g555#v#v#vg#v:V l4 t0    +++,555g5/  /  /  / /  /  /  / / f4TW$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TI$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  / f4TW$$If!vh555g555#v#v#vg#v:V l4 t0    ,555g5/  /  /  /  /  / /  /  / f4TcDd b  c $A? ?3"`?2ۣT)̂e+934 `!ۣT)̂e+934PhOxڝkQ$&%֪۪n SҠ(^Z4izxR?𠂇xѻ(7^}6aw3A pĕa=;SeRNX30!%xCXŵQx3\cVitOn<â`[eBkזZ6y}/.B*) "O?EL{:_:qTo1W&l|6!7[EOrU%mRT({ecFW8Ay2㞍w;cʦ Wrxv*tk>_%È ~^ BYrq)O pk:u{Q@r>Io'KA\Cќ2>*,:c O"U2t o q>=[^i "c RޮmNLmCDd  P  C A01"`b)3GM{>MqC8 n)3GM{>MqPNG  IHDR00PLTE㜜xxxUUU333 tRNSSOxbKGDH cmPPJCmp0712OmIDATxYDZ |wp HU,VR?R?xcgt5dwxoYutj7`vq a7`vq a7`v~ jFJ.[_7}h_>L`*gSU{AuUq0SӀaWt0e(I?1#M?Lu nzcj ~ eHu{gfOvq a7`vq a7ΎԗSA`j't4CcNTAk={\tN0:6sLz´D Au]ᒳ+p/ v3ofK'9g % ltR"\ ^%g0u啵m ݜz%MK-%gK0JgoQv^)ڶԲ[r6SqVTr.+٭TPm&nwiE$_uSfkT_ eȡS ʨ6. &;]lJ)U٣?F)0H)&O8 Gs&&Jn /R>lYsյ`ՄfGBvD(!ɜׁA8lzby`ukVΡ{l*V6~Tj[W<;z,yv 󳜽7ukv n [N0uUY_O2J:')]X{c !*; XlZ.l~~լ9AVn<*](\XZJ+R 1k+GIN>dqI-=V:JzUw2jQpzwOl-^_Bb۴r7di`MY026kb\r_QC&0UTjRc„ `C9<&ɵ6P? $:@ AAQ/4`<`dBrgikw/1V(0Ջ7N\S $t0T@x0MwoɫS:?0gǣ&ai5M2!NA>0L]2_س~DV(0!Y`2XLɣc@l&+r9PPտV&9ٗ$QlU4<(Xu`<ש\䬭78*FGGX>,nA`-L\ʬO;Б`XJiMO`"k[KMSx,+oA(06;x'T{U=;JW"TL3JOd4q? ,_Q=pc(mNjg38dd0hw0W.`fmq쟓A)ohK:l+`PA0IFmQ0E=H0wsn9HLr /  }cWc2wLں鑽Rt%61`Ԡ z:\ǭɜ@| >T ̏<&LYKE6tY`v!Al0ʡ?djbv d`D]1\`E2_2bN ~|tl0f\a tǃGr(zOf^uMN4"`J5)G|3 t_0|9զd[S_?$d( $^cPkFJc u9}?oGl/sH CQ 0p`oj[b#zSOooa,ϏAq1SYU[J L ii.1ہsz{J0Ѝ0.'|Xx }4 &Vʄ7 Lg>F{A/6¹w4p}1C7sN%>LA䱩—U WփɎZ5e24L L@C˻`iQCz~0uIRb0Yoh dm/}@%x &҉󗨫Пcv1Ҫ>-9hSY}B0EIHNfL)K,Ua苀A`l 0˻ y,cpcDDjZ15VLd 3ߛP"h0dcH&O5Re5/]8P ,ǿLetX>L6l|`r?F(^/2,# &3ּ^oSocvH"56վ@z4=Ve .__WM ѢR?qa"ˁA c; =ރاtG{j\$6Mp`l0sF=5 >u &=- z ./IfIe<~@?,9J+ q 7c XVfxVUF*s$J U+VF%8̹9*KO1`b뽆/DG¾W^p_(8%1/yAVGFNaMg^L$ =1eb¾Lz'."#{/H q|q6'!^i_WRAl+=XJU(iYkfBbzxIm%D[X% 2~I񥢜hXI:|C%|koP:55^"ELgaq5NZYK%2򜓃AD9<$FS|UD (AyL;gҝBg/ )1^k$#2"W2\Fܹu,cR,7{yI`^̹>>tǃ?&%sJw`Nit~Z[klNcs2퇜ǀE3 -SguK;g;R}|ҫ-&,9ėpgQ*uwXƓ2_ȋH.kӻ~LٺN`c%aJ~?uBCc,^dqKM]}}k /qy:X6_\~Ÿ_ C«d7K945{rhl1ӫ`VaăUdF&[f?QШ1=薘I1z|-0hQNP1G(6hf6ubqi[ghP ѬYjPbt|GcTq܍c`7FjA ,jK[Nb KREtJ`Riy˴MѴUW30D-ٻ$.c˴/9l|ucˆ<yBYpkxZ:OT::ybB3[i̙;DB4FMK@cgw 0~D%!/u.MdBx6CXz„MFrIZ $FVT=단s`B`|؇ ?3w:ipvNv'_=U8x0;LY!*cDo+vۃ:ri!3̝?"3= ywmβ^Wzz0 A|°[!݉T 3.Hr,ɪ"rSd2[7}=d93,v6ǎ@_4"I:Ax8p%:2Ӽ73f?56,T"|WLsIeI=a_y` `R5G$neIwm0)T$-^1>C |8 #wIӭ_o|i0 D PR:BaKAn1oWLqKQ10I?eXuKhO.T2psjhրIBesrNa"Vp]5*{GȬӹՆR}::k*g}A^舎t[t8Sbgh&.!y`"v0m.)/EλhM>s/% 1*XuK|ʊ 6#̇S$M 'xzj*EvdZV^L7mg0iJzd :F fI a赱P5BR=$pa09;ˋ3Q}BBW``::`Yc3-{a$/Nz/g "WRx"b(H&2jElcNS`}Io`6iNS .fa$*'a`6ľtRZtyI:ف:<@~w0( ;'au---M N#ʉ* QAz Fוz5N"U;LDv7qByOYn' eizj!`8 8iꯍEk' *dgLLS:NZ8P5j$w \f 3ۅxrQ#4s5 ;Ne ){|{|=01,x8 ;cId`\6ao 3Bbxz7,f3 .1ͳ.*YJT]wwǠ 0-%|\ ($8Rˤݙ=F eY(RۤEl{iru[0XW]!6` -"Y!6`z9@Z[P LDBd? 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