BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...

More documents

Recommendations

Info

72 Mircea Cozmîncă et al. 40C10 γ=0°; λ=0° s=0.1 mm/rev Fig.4b – The influence of speed values for 40C10 steel From the diagrams in Figs.1 – 4 result that Fz and Cd are decreasing when the angles γ, λ and cutting speed values are growing. When the cutting feed is increasing, the force Fz grows and the coefficient Cd decrease. For OL44 steel, the Fz values are smaller and the Cd are larger than those resulted for 40C10 steel. For OL44 steel, the mz exponent is relatively constant in the 1.2 – 1.4 range. For 40C10 steel, the mz values are variable in a larger domain, 0.8 – 1.22. For λ=0° and γ=0° the mz exponent may achieve even the value of 1.95 (Fig.2b). This is the reason why mz it is necessary to be reached for every material type. The chemical composition, the nature and the structural micro constituents´ distribution of the cut material determine the plastic deformation capability. Consequently, the cutting forces level, the values of Cd and the mz values through which Cd amplify the cutting forces values are indirectly influenced. 4. Conclusions 1. The experimental researches regarding the values of cutting force Fz and coefficient Cd for the four steel types were stressing the known dependencies from angles γ and λ, cutting feed and main cutting speed. 2. The level of influence of the constructive angles γ and λ, of cutting feed and speed takes different values depending on the material being cut. 3. Experimental tests are necessary for each material, to determine the values for mz, mx, my exponents in order to use the models in Eqs. (1)-(4) for the force components Fz, Fx, Fy on a cutting tooth.
Bul. Inst. Polit. Iaşi, t. LVI (LX), f. 2, 2010 73 Received: ”Gheorghe Asachi” Technical University, Department of Machine Tools Iasi, Romania e-mail: cozminca@tcm.tuiasi.ro R E F E R E N C E S 1. C o z m î n c ă M., C o z m î n c ă I., P o e n a r u S., A new Model for Estimating the Force Components Fz, Fx, Fy when Cutting Metals with Single Tooth Tools, Buletinul Inst. Polit. Iași, editat de Univ. Tehnică “Gheorghe Asachi”, LV(LIX), Construcții de mașini, 1, 2009, pp.1-7. 2. C o z m î n c ă M., C o z m î n c ă I., P o e n a r u S., Variation of the Ratios between Forces Fz, Fx, Fy and the Plastic Strain Force in Single Tooth Cutting. Buletinul Inst. Polit. Iași, editat de Univ. Tehnică “Gheorghe Asachi”, LV(LIX), Construcții de mașini, 1, 2009, pp.8-14. 3. P o e n a r u S., C o z m î n c ă M., Model for the Deformation Force at Metals Cutting with Single Tooth Tools. Buletinul Inst. Polit. Iași, editat de Univ. Tehnică “Gheorghe Asachi”, LV(LIX), Construcții de mașini, 2, 2009, pp.1-7. 4. C o z m î n c ă M., C o n s t a n t i n e s c u C., Bazele așchierii. Ed “Gh. Asachi”, Iaşi, 1995. CERCETĂRI EXPERIMENTALE PENTRU VALIDAREA UNEI NOI METODE DE EVALUARE A FORȚELOR DE AȘCHIERE (Rezumat) În lucrare se prezintă modul de realizare a unor cercetări experimentale preliminare în vederea stabilirii mărimii forțelor de așchiere, la strunjirea a patru mărci de oțel, în scopul definitivării modelelelor de calcul pentru componentele Fz, Fx, Fy ale forței de așchiere la nivelul uni dinte așchietor. Noile modele de calcul au în vedere aria secțiunii transversale a așchiei nedeformate (txs), limita de curgere a materialului așchiat și coeficientul de deformare plastică a așchiilor. Coeficientul de deformare plastică a așchiilor include toate influențele parametrilor de lucru, precum și interdependențele dintre aceste influențe. Pe lîngă aceste elemente, modelele de calcul propuse cuprind și o componentă teoretică, în funcție de unghiurile constructive ale dintelui, γ, K, λ și coeficientul de frecare dintre așchii și suprafața de degajare a dintelui așchietor.
Page 1:
BULETINUL INSTITUTULUI POLITEHNIC D
Page 5:
Papers presented at THE INTERNATION
Page 8 and 9:
SILVIU BERBINSCHI, VIRGIL TEODOR, N
Page 10 and 11:
Page 12 and 13:
CONSTANTIN CHIRIȚĂ, ADRIAN HANGAN
Page 15 and 16:
Page 17 and 18:
Bul. Inst. Polit. Iaşi, t. LVI (LX
Page 19 and 20:
(6) ⎧ ⎪ ⎨ ⎪ ⎩⎪ FR 1 FR
Page 21:
Page 24 and 25:
10 Taxiarchis Belis and Aristomenis
Page 26 and 27:
Page 28 and 29:
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37: 22 Nikolaos Tapoglou and Aristomeni
Page 46 and 47: 32 Eugen Străjescu et al. The mode
Page 48 and 49: 34 Eugen Străjescu et al. On the o
Page 50 and 51: 36 Eugen Străjescu et al. 3.5 3 2.
Page 52 and 53: 38 Eugen Străjescu et al. 2.5 2 1.
Page 55 and 56: BULETINUL INSTITUTULUI POLITEHNIC D
Page 57 and 58: Bul. Inst. Polit. Iaşi, t. LVI (LX
Page 69 and 70: (5) Bul. Inst. P olit. Iaşi, t. LV
Page 73 and 74: p (4) g( ) (5) p g( ) Bul. Inst. Po
Page 81 and 82: (5) Bul. Inst . Polit. Iaşi, t. LV
Page 85: Bul. Inst. Polit. Iaşi, t. LVI (LX
Page 90 and 91: 76 Ana-Maria Matei and Marius-Nicol
Page 98 and 99: 84 Marius Ionuţ Rîpanu et al. The
Page 100 and 101: 86 Marius Ionuţ Rîpanu et al. Fig
Page 102 and 103: 88 Marius Ionuţ Rîpanu et al. The
Page 104 and 105: 90 Marius Ionuţ Rîpanu et al. R E
Page 106 and 107: 92 Iustina Elena Rotman et al be co
Page 108 and 109: 94 Iustina Elena Rotman et al This
Page 110 and 111: 96 Iustina Elena Rotman et al 5. *
Page 112 and 113: 98 Cătălin Ungureanu et al. Devia
Page 114 and 115: 100 Cătălin Ungureanu et al. VI g
Page 116 and 117: 102 Cătălin Ungureanu et al. d [m
Page 118 and 119: 104 Cătălin Ungureanu et al. SIST
Page 120 and 121: 106 Birgit Kjærside Storm parts wi
Page 122 and 123: 108 Birgit Kjærside Storm They are
Page 124 and 125: 110 Birgit Kjærside Storm A fresh
Page 126 and 127: 112 Birgit Kjærside Storm rate of
Page 128 and 129: 114 Birgit Kjærside Storm The HSP
Page 130 and 131: 116 Birgit Kjærside Storm 4. P i z
Page 132 and 133: 118 Ioana Petre et al. The utilizat
Page 134 and 135: 120 Ioana Petre et al. by a pneumat
Page 136 and 137:
122 Ioana Petre et al. Another appl
Page 138 and 139:
124 Ioana Petre et al. APLICAŢII I
Page 140 and 141:
126 Mihăiță Horodincă absorbed
Page 142 and 143:
128 Mihăiță Horodincă 3. Some E
Page 144 and 145:
130 Mihăiță Horodincă For certa
Page 146 and 147:
132 Mihăiță Horodincă behaviour
Page 149 and 150:
Page 151 and 152:
As the planetary processional trans
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
(4) Bul. Inst. Polit. Iaşi, t. LVI
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Page 221 and 222:
then, under the principle of optima
Page 223 and 224:
Page 225 and 226:
c) Calculate values (14) ⎧V ⎪
Page 227:
Page 230 and 231:
216 Dănuț Zahariea and Mihaela Tu
Page 232 and 233:
Page 234 and 235:
Page 236 and 237:
222 Dănuț Zahariea and Marius Sta
Page 238 and 239:
Page 240 and 241:
Page 242 and 243:
228 Irène Alexandrescu et al. Glob
Page 244 and 245:
230 Irène Alexandrescu et al. 3. S
Page 246 and 247:
232 Irène Alexandrescu et al. The
Page 248 and 249:
234 Irène Alexandrescu et al. depa
Page 251 and 252:
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Conventional approach Client specif
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
Page 269 and 270:
Page 271 and 272:
Page 273 and 274:
Page 275 and 276:
Page 277 and 278:
Rate of recycling, [%] Bul. Inst. P
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
Page 285 and 286:
Page 287 and 288:
Fig. 15 - Air velocity distribution
Page 289:
Page 292:
Stachie Marius 221 Storm Kjærside
show all

BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?