907 実機クラッチプーリ用転造ローラの破損原因および改善策

概要

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It has been investigated that what were the causes of failure of forming roller for clutch-pulley of automotive air conditioner and the reason of its short life. Fracture surface analysis, thermometry of the roller by infrared camera and vibration measurement with laser displacement gage in the forming process was carried out in order to find the cause of failure and its remedy. From fracture surface analysis, it is clarified that the fracture mode of forming roller is fatigue fracture. The fatigue fracture occurred owing to cyclic vibration of the roller at the top part during the forming process, and that is why the life of the forming roller became short. As a result of measuring width-side vibration of the roller in the forming process, it was found that maximum vibration value of the roller was 408μm with the laser displacement gage, and there is a correlation between the vibration value and the life of the roller. Therefore, the forming roller needs to be designed considering the vibration of the forming roller at the top.
一般社団法人日本機械学会の論文
2002-08-23