RESEARCH AND OPTIMIZATION OF PARAMETERS CONCERNING THE INTERACTION MECHANISMS BETWEEN VERTICAL CUTTING BLADES AND STRAW IN CORN COMBINE HARVESTERS

This study introduced a vertical straw shredding device that integrates both cutting and shredding functionalities, with the crucial components of the blade designed in a bionic serrated pattern. In order to explore the interaction mechanism between the vertical cutting blade and straw, a mechanical model of the cutting force has been developed. Based on the ANSYS-LYNA software, a cutting model for straw-bionic blades has been established. Regarding the test factors, i.e., the spindle speed, blade installation angle,forward velocity, and blade tilt angle, single-factor and orthogonal tests were also performed. Furthermore, the maximum equivalent stress experienced by straw was taken as the primary evaluation index.Accordingly, the results revealed the influencing parameters to be ordered as the blade installation angle> spindle speed > forward speed > blade tilt angle. the optimized parameters for the cutting blade were determined to be a spindle speed of 1400 r/min, an installation angle of 55°, a forward speed of 4.0 km/h, and a blade tilt angle of 0°. Similarly, the optimized parameters for the shredding blade were established as a spindle speed of 1400 r/min, an installation angle of 50°, a forward speed of 4.0 km/h, and a blade tilt angle of 0°.