buletinul institutului politehnic din iaşi - Universitatea Tehnică ...

Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 281
There have been the measurements of cutting force strains on the node,
the values in Table 3 were obtained for the following node diameters: 4.74 mm
for wheat, 3.02 mm at barley, 3.17 mm at oats, 6.93 mm at triticale, 4.92 mm at
soybean, 3.45 mm at pea, 4.72 mm at beans, 11.56 mm at rapeseed, 22.68 mm
for sunflower, 8.13 mm at sorghum and 31.02 mm for maize. So, for wheat the
lowest values of cutting force is recorded at the JOHN DEERE and NEW
HOLLAND blades type, at soybean, rapeseed, sorghum, oats and peas CLASS
model, at sunflower oats, triticale and corn bean FENDT model, followed by
JOHN DEERE model at soy, oats and corn.
4. Conclusions
1. Having regard to specific geometric characteristics of each type of
cutting blades, in terms of width blade, sharpening angle and opening angle of
the blade grained, one can say that there is no constructive alternative to record
the minimum cutting force values for all the cultures studied.
2. On the basis of experimental data can be choosing a type of harvester
for each crop, or a group of crops for which the values of the cutting force are
minimum.
3. As regards of the process of cutting the stems, cutting blades from the
romanian combines registered values not closer to the minimum in any of the
cultures studied, and this must be investigated and find a solution to reduce
cutting force levels comparable with the imported machinery.
REFERENCES
Bochat A., Identification of Quasi-static Cutting Force of Triticale-straws for
Designing Use of Scissor and Finger Cutting Sets. Journal of Polish CIMAC, 4-3,
17-22 (2009).
Neculaiasa V., Operaţii şi procese de lucru ale maşinilor agricole de recoltat. Ed.
,,Gheorghe Asachi”, Iaşi, 2002.
CERCETĂRI PRIVIND TĂIEREA TULPINILOR VEGETALE CU APARATE DE
TĂIERE DE LA COMBINELE DE RECOLTAT CEREALE
(Rezumat)
Se prezintă rezultatele experimentale obţinute la tăierea tulpinilor la 11 culturi
agricole, cele mai importante în agricultura românească, folosind aparatelor de tăiere de
tip cuţit deget din dotarea unor combine de recoltat cereale aflate în exploatare. Au fost
studiate aparatele de tăiere de la combinele româneşti DROPIA, SEMA şi GLORIA,
precum şi de la combinele CLASS, FENDT, JOHN DEERE şi NEW HOLLAND, pe un
stand care a permis măsurarea forţei de tăiere a tulpinilor pe intervalul dintre noduri şi
pe nod.
Cu ajutorul unui traductor de forţă s-a măsurat forţa necesară tăierii tulpinilor la
grâu, orz, ovăz, triticale, porumb, floarea-soarelui, mazăre, soia, fasole, sorg şi rapiţă,
atât la tăierea între nodurile tulpinilor, cât şi la tăierea pe nod.