Hand-Arm Vibration Exposure of Workers in Aluminum Die-casting

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  • SHIBATA Nobuyuki
    Human Engineering & Risk Management Research Group, National Institute of Occupational Safety and Health
  • NAGATA Tomohisa
    Institute of Industrial Ecological Sciences, University of Occupational & Environmental Health
  • SHIOTA Naoki
    Occupational Health Physician, Health Promotion Office, Health Care Support Center, General Affairs & Human Resources office, Ube Industries, Ltd

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Other Title
  • アルミ鋳造品製造工程における作業者の手腕振動ばく露の実態
  • アルミ チュウゾウヒン セイゾウ コウテイ ニ オケル サギョウシャ ノ シュワン シンドウ バクロ ノ ジッタイ

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The hand-arm vibration exposure level of workers who occupationally use hand-held power tools was measured in four operating processes of aluminum-die-cast manufacturing. Also the workers orally answered questions regarding the daily exposure time to hand-arm vibration caused by the use of hand-held power tools, subjective symptoms in the hand-arm during / after daily tool operation, and countermeasures used to reduce vibrations on the to the hand-arm system. According to vibration dose evaluation based on the daily equivalent vibration exposure, the exposure limit durations were a little more than 1 hour for polishing operation in the finishing process and less than 1 hour for final polishing in the inspection section. Actually the workers in these sections are engaged in polishing, using the tools for 5 hours in a day. Almost all of the tool operators complained of temporary fatigue and numbness of the hand during / after the daily tool operation. However no use of anti-vibration gloves was observed in these workplaces. The results suggest the current workplaces require the systematic control of hand-arm vibration exposure based on the concept of energy-equivalent daily vibration exposure, which includes educational orientation on the use of anti-vibration gloves.

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