OOO «Resurs» (Stavropol, Russia):

Malyarov P. V., Director, Doctor of Engineering Sciences, petrmalyarov@gmail.com

The work is dedicated to the choice of ball mill drum’s combination rubber-metal liners’ ratio of sizes. Damage mechanisms were analyzed with respect to liner plates from different materials. Steel liners are subject to abrasive wear caused by load material interaction with liners under sliding conditions and to contact wear of surfaces, where balls impacts upon liners occur without sliding. Rubber liners are subject to fatigue abrasive wear under the conditions of secondary and subsequent grinding stages. Under the conditions of primary grinding stage forces of load interaction with liners are greater, than rubber tear resistance. Application of combination rubber-metal liners permits to decrease balls impacts’ contact interaction with liner metal inserts through liner structural damping effect. Combination rubbermetal liner profile permits to entrain external layer of load material into upward trajectories without sliding. Liner’s inoperative rear surfaces exactly follow the trajectories of balls relative motion prior to impact with liner, and liner’s working surfaces are orthogonal to rear surfaces. In such a case contact stress and wear of metal inserts are decreased, attributable to the fact that liner’s working surfaces are metal inserts. Metal inserts may be made of manganese steel or abrasion-resistant cast iron. Character of balls interaction with liners from different materials was studied by means of software program ABAQUS, based on the finite element methods. The choice of metal inserts and rubber matrix mass relation shall provide for thorough material grinding between ball charge external layer and liner. Force, required for disintegration of maximum size lumps in load material, is proposed to be determined with the help of drop-weight method tester.

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