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274 Gelu Nuţu and Ioan Băisan Fig. 4 – Diagram obtained by computer. Fig. 5 – The structural characteristics of the cutting blade. Strains used in the tests had medium size, whose size was determ ined with a micrometer. 3. Experimental Results Strains, from measurements had values between 4.51 to 4.74 mm for wheat, between 2.94 to 3.02 mm for barley and between 2.82 to 3.17 mm from oats
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 275 From experimental data presented in Table 1 can be seen that the shear force has the highest values in the case of strains of wheat, and here vindrover knives are cut with the smallest force, the vertical strains and strains inclined. As expected, the shear force values register lower in all cultures whose stem is inclined, in this case cutting is more advantageous energetically. Cutting force size changes significantly when cutting is performed on a node of the stem. The biggest differences are the cut stems of wheat is 2.5 times higher in type FENDT knife blades, knife type blades 2.7 times at SEMA and 6 times higher in type vindrover knife blades. Table 2 Variation of cutting force and displacement of the cutting blade plant strains Vindrover SEMA FENDT force (N) displacement force (N) displacement force (N) displacement (mm) (mm) (mm) vertical strain-cutting between nodes wheat 14,95-22,09 10,1-11,2 27,16-27,36 10,1-11,1 28,18-31,24 17,1-18,7 barley 9,85-12,1 9 ,1-10,5 1 4,95-19,03 16,2-17, 6 1 4,95-15,97 14 ,8-16,3 oats 11,89-13,93 9,4-10,7 15,97-19,03 7,7-8,9 10,81-12,91 19, 2-20,2 inclined stra in-cutting between nodes wheat 1 3,93-22,09 10,1-11,2 25,16-29,2 11,8-13,2 27,45-32,21 15,1-16,7 barley 9,25-11,89 12,8-13,8 11,89-16,98 1 1,4-13,1 14,73-16,57 15,4-16,9 oats 7,81-11,89 14,9-16,5 13,25-17,02 8,9-10,1 7,77-9,79 17,6-19,2 vertical strain-cutting p er node wheat 117,8-132,1 8,2-10,1 62,84-73,1 12,2-13,3 62,84-76,9 19,2-21,1 barley 15,79-20,05 8,9-10,1 32,28-44,48 10,0-11,3 2 2,09-27,16 14,8-16,3 oats 26,14-34,3 6,7-7,8 57,74-68,5 7,9-9,3 25, 12-26,14 19,1-20,2 The cutting force cutting strains of barley is a smaller increase, from 1.66 times at vindrover and 2.31 ti mes at SEMA, while the oats betwee n 2.02 times at FENDT and 3.57 times at SEMA. 4. Conclusions 1. The stand realized allows the determination with sufficient accuracy cutting force and displacement stems vegetable knife while cutting the node or between nodes. 2. The construction is equipped with load and displacement with high sensitivity and presentation software makes chart as measured values. 3. The stand can be used to measure cutting force for any crop at all stages of vegetation and any constructive variant of type knife-finger cutting apparatus. REFERENCES Filipescu I. , Contribuţii la tăierea mecanizată a viţei de vie în uscat. Teză de doctorat, <strong>Universitatea</strong> <strong>Tehnică</strong> ,,Gheorghe Asachi” Iaşi, 1998.
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