Understanding the temperature distribution and influencing factors during high-frequency induction brazing of CBN super-abrasive grains

The temperature distribution characteristics in high-frequency induction brazing of cubic boron nitride (CBN) super-abrasive grains is investigated based on finite element simulation in this article. Influences of the following factors, i.e., current frequency, current magnitude, heating gap, and scanning speed, on the resultant heating temperature are discussed. The results obtained display that, during the rotating induction heating process, the effective heating zone is concentrated on the top surface of the metallic wheel substrate (i.e., AISI 1045 steel) below the coil. The highest value of the resultant heating temperature becomes larger when heating with a higher current frequency, a higher current magnitude, and smaller heating gap values; however, a higher peripheral scanning speed results in a decrease of the resultant highest temperature. The optimum parameters are determined as the heating gap of 2 mm, current frequency of 1 MHz, current magnitude of 20 A, and peripheral scanning speed of 0.5 mm/s. Finally, the simulation results are testified and validated in the high-frequency induction brazing experiment of CBN grains.