Structure design and experimental study on ultrasonic vibration–assisted induction brazing cubic boron nitride abrasive tools

Abstract

Brazed abrasive tool has been widely used in high-precision machining of di cult-to-cut materials to improve the machining e ciency and quality. However, the severe wear and associated short service life during machining processes have to be faced for conventional induction brazed (CIB) abrasive tools owing to its weak bonding strength between abrasive grains and metal-bonded materials. In this case, a novel ultrasonic vibration-assisted induction brazing (UVAIB) device was developed to improve the abrasive bonding strength. Here, the frequency equation of the UVAIB device was derived using recursive methods, and then the geometric designation parameters were optimized with the nite element simulating method. In addition, the performance of UVAIB device was tested in terms of the impedance and amplitude. Subsequently, the comparative experiment trials were performed with the brazed abrasive tools under the CIB and UVAIB method. Results show that the ultrasonic energy loss of UVAIB device could be reduced, and then the ampli cation value and vibration uniformity could reach 8 and 92%, respectively. In addition, for CIB, there are a large number of pores and macro-cracks on the joints. However, the internal pores inside the metallic matrix of UVAIB were reduced, and only fewer and smaller micro-cracks could be found. Furthermore, the intergranular fracture of abrasive grains could be observed for CIB abrasive tools owing to the weak bonding interface caused by the existence of numerous micropores, whereas the grain transgranular fracture appeared once adopting the ultrasonic vibrating method.

Study on grinding performance during ultrasonic vibration-assisted grinding ultra-high strength steels

“…In this case, it's very signi cant to lessen the grinding force and temperature, and thus improve the wear-resistance performance of alumina wheel and grinding quality through employing a new grinding technology. Ultrasonic vibration assisted grinding (UVAG) was usually applied to improve the machinability of materials and machining quality by changing the relative motion relationship between grinding grains and workpiece [13][14][15][16][17][18]. Meanwhile, the different material removal mechanisms and grinding performance related to various steel materials were investigated at home and abroad [19][20][21][22].…”