关键词: 切割性能, 刃倾角, 响应面分析, 比功耗

Abstract: Aiming at the problems of high power consumption, low productivity and poor cutting quality of hay cutter at present, a cutting performance test platform was built by using 9Z-4C silage hay cutter. Based on the force analysis of the blade cutting process, the influence of the blade inclination angle on the cutting performance was determined. Taking the spindle speed, blade inclination angle and feeding amount as the experimental factors, a single factor experiment was carried out. The results showed that the best cutting performance ranges were as follows: spindle speed 600~700 r·min^-1, feeding amount 0.9~1.5 kg·s^-1, blade inclination angle 60°～70°. Based on the Box-Behnken response surface test, the primary and secondary order of the influence of factors on the specific power consumption in the cutting process was spindle speed>feeding amount>blade inclination angle. According to the experimental results, the optimal parameter combination of various factors was analyzed by using Design-Expert 8.0.6 software, and the minimum specific power consumption was taken as the response object. It was found that when the spindle speed was 642 r·min^-1, the feeding amount was 1.3 kg·s^-1, and the blade inclination angle was 63°, the specific power consumption was the minimum. The cutting performance was improved by 14% compared with that before optimization. Above results provided basis for parameter optimization and structural improvement of cutting device of the hay cutter.

Key words: cutting performance, blade inclination angle, response surface analysis, specific power consumption