Evaluation of Preventive Measures to Counter Vibration Disease in an Iron Foundry

Some preventive measures to counter vibration disease in an iron foundry were investigated. The servo-arm with a servo-mechanism for the portable vibrating tool was developed and introduced. Vibration acceleration level, noise level and dust exposure level of servo-arm equipped chipping-hammer were reduced by 25 to 30 dB, about 10 dB and three fourth respectively, compared with the chipping-hammer operated directly. This servo-arm reduced also the temporary shifts of vibratory sensation threshold and pinching power during the operation time. The polishing room with a local air exhauster 150 m^3/min) and two infrared lamps (3kw×2) were set up in the foundry…