DEVELOPMENT OF THE STANDARD ROCKWELL HARDNESS MACHINE BASED ON FORCE LOADING USING MOTOR IN CLOSED LOOP METHOD

摘要

This paper mainly presents that one standard Rockwell hardness machine has been developed based on force loading using motor in closed-loop method without weight. The mechanical structure of the machine, design principle of the closed-loop force and the control method, are introduced. The results show that the precision of the preliminary and total force can respectively achieve to 0.2% and 0.1%, and the expand uncertainty is not more than 0.3HRC, k=2.