Abstract: In order to design a working platform that can reduce the working posture load of casting grinding workers, the videos of grinding work were first recorded on the spot, and then the working posture of the grinding operation in the video was analyzed by the OWAS (Ovako working posture analysis system) method. It was found that workers had to keep their back and legs bent for a long time when grinding castings and 86% of working positions were at the level of AC3 and AC4 (the two highest fatigue levels), which were in urgent need of improvement. In view of problems found in the posture analysis above, a new work platform suitable for the grinding operation is designed by combining the human body size data and the realistic constraints of the grinding operation. And the Jack software is used to verify the new platform. The results showed that when workers grinded castings on the new working platform the posture level of AC1 (the lowest fatigue level) accounted for 42.6%, the AC2 accounted for 57.4%, and the AC3 and AC4 were basically eliminated, so that the working posture of casting grinding workers has been significantly improved.

Key words: posture analysis, grinding work, operation platform design