Investigation of composite coating induces noise reduction for circular saw blade

Abstract

Sawing is the most common process applied in the primary and secondary machining sectors. Unfortunately, circular saw blades (CSBs), as the main tool for sawing, will generate excessive noise in the idling and processing, affecting the user's health and the workpiece surface quality. Hitherto, numerous studies have modified the body structures of CSBs for noise reduction. Its challenge is to reduce the CSB’s stiffness and bearing capacity. Here, a novel composite coating circular saw blade (CCSB) was proposed indirectly improving material damping properties. Subsequently, the frequency response characteristics and harmonic acoustics of CSBs were analyzed by the finite element (FE) simulation. Results suggested that the CCSB can present a notable noise reduction ability. It was found that the peak value of the radiation noise for CSBs is mainly concentrated around the sawtooth passing frequency (SPF). By the analysis of the vertical field, the CCSB disorganizes the original sound pressure level (SPL) field due to the dissipation of shear energy, improving the original SPL distribution. The proposed analysis method of the CCSB can provide theoretical guidance for design, optimize low-noise CSBs and improve the processing environment in the future.