Research On Mechanism Of Noise Reduction By Damping And Damping Diamond Saw Blade

Diamond saw blade is a tool which is widely used in cutting hard brittle materials, such as stone, concrete, glass, crystal, graphite electrode and so on. At the same time, the cutting noise usually outstrips 105dB while cutting. The noise pollution badly jeopardizes the health of the operating workers.Matrix structure of diamond saw blade was designed rationally. Through experiment, rational joint technology was defined and matrix of diamond saw blade with noise damping was prepared. Matrix was jointed by two-sided spot welding, and welding area is 25% or so of matrix. Mechanics on noise reduction of the structure is as followed: There is a very thin air layers between the matrix, so the structure of multi-layer is formed. That is metal A-air-metal B-air-metal A or metal A-air-metal B-air-metal B-air-metal A. On the cutting motivation conditions, air layer between two metal layers is flowed to-and-fro, which can absorb a part of motivation energy, so it leads to low noise radiation. In addition, Because of different matter with different natural frequency, vibration of saw blade will weaken, when it transmits in the different matter. So the noise will be reduced. At last, vibration can make dislocation of metal slip and climb, which dissipate the vibration energy to reduce noise while cutting.Through noise testing, we draw a conclusion that vibration of outer 1/3 which lies radius of diamond saw blade is more intensive than other place of it. However, the attenuation time (1.0s or so) of damping saw blade is much faster than it of diamond saw blade without damping (15s or so).In addition, the influence of interlayer thickness on effect of noise reduction is be researched. We determine the most optimized interlayer thickness (0. 10mm) through experiment. On the cutting conditions without spraying water damping, the cutting noise of damping diamond saw blade is 86.69dB, it is 17.81dB smaller than it of ordinary diamond saw blade, which conforms with requirement of industry hygiene standard (90dB).