Abstract
The two-roller mill is a basic processing machine in polymer industry, and the rollers are one of its important working parts. In the present paper, the working process of the mill roller used in plasticization of polymers and its failure mode is analyzed. The bending stress, shear stress, and resultant stress at the critical section of the mill roller are calculated to obtain its fatigue strength, and the corresponding diagram of fatigue limit graph is drawn. Based on the conclusion that fatigue failure is the main form of failure of the mill roller, a reliability analysis is applied to the fatigue strength of the mill roller and the reliability parameter is worked out. From example, it shows that the reliability of the mill roller is very high. Therefore, the working load may be increased appropriately.
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