Abstract: Taking the combined roller of GM1400×800 high pressure grinding rolls as the object, a combined roller geometric model of an interference connection is proposed. The key structural parameters of the combined roller bearing torque were obtained. With the determined unilateral interference quality range and selected appropriate value, the influence of drum-shape error on combined roller contact surface bearing torque of high pressure grinding rolls was analyzed. The results show that proper drum-shape error can not only reduce stress concentration on both ends of the combined roller, but also make the radial stress distribution on the contact surface more uniform and increase the average radial stress value. When the unilateral interference quantity equals to 0.45 mm, the torque capacity of the combined roller increases monotonously with the drum-shape error if the error is lass than 0.07 mm, and when the error equals to 0.07 mm the capacity reaches the maximum value. Hereafter, the torque capacity gradually decreases as the error increases. Therefore, to reduce the stress concentration on both ends of the combined roller, the drum-shape error should be controlled within the range of 0.03 mm to 0.07 mm.

Key words: mine mechanical engineering, combined roller, torque, drum-shaped error, magnitude of interference