OPTIMIZATION OF PARTIAL HIGH-FREQUENCY QUENCHING TECHNIQUE PARAMETERS OF ROTARY TILLING BLADES

The high-frequency quenching technique can enhance the surface hardness of 65Mn rotary tilling blades, thereby improving their wear resistance. This approach addresses common issues found in conventional rotary tilling blades, such as severe wear failure, short service life, and reduced operational efficiency due to frequent replacements. The quenching position was determined through finite element simulation. Based on orthogonal rotation combination tests using ternary quadratic regression, quenching temperature, tempering temperature, and tempering time were identified as key test factors. Using blade hardness as the evaluation index, the optimal parameters were determined to be a quenching temperature of 852 °C, tempering temperature of 171 °C, and tempering time of 85 minutes. Under these conditions, the blade hardness reached 57.5 HRC, meeting the national standard. Blades treated with these optimal quenching parameters were tested under actual soil conditions over a total operating area of 67 hm2. The results showed that the average wear of the quenched blades was 11.9 g, and their wear resistance was 3.13 times higher than that of blades treated with conventional heat treatment. This represents a significant improvement in abrasion resistance and provides a solid experimental foundation for the reliability assessment of rotary tilling blades.