An Experimental Investigation on the Effect of Shot Peening on the Tooth Profile, Helix Deviation and Noise Level of Spur Gears

摘要

This paper investigated the influence of shot peening on the tooth profile, helix deviation and noise level of spur gear. Tooth profile and helix deviation and noise level was obtained by changing the shot size and exposure time. Hence a special CMM apparatus was used for measuring of tooth profile and helix deviation. A special noise and vibration measurement instrument, HARMONIE system, 01dB Metravib, and special gear testing apparatus, HORTH ZP320, were used for the investigation of noise level around an average value of speed of 750 rpm and 100% load condition. The transmission parameters such as backlash, axial clearance, main center distance and run out were controlled during experimental testing. After and before shot peening test gears and counter master gear were engaged each other and sensors including accelerometer and microphone were installed in the sensitive position. The acquired original signals from dBFA software were filtered and processed in MATLAB software. Comparison of experimental results before and after shot peening presented as narrow-band noise level spectrum and as bar graphs of unpeened and the various shot peened state.