Industrial experiences of bending fatigue strength in table liner for cement mill

초록

A table liner for the vertical roller mill has been used to grind natural limestone. Unexpected fatigue failure accidents have occurred during portland cement manufacturing process. The design life of a table liner is 4 x 107 cycles, but the actual fatigue life of a table liner is 2 x 106 to 8 x 106 cycles. The fatigue crack of a table liner initiates from the outside edge of the grinding path of the limestone. When such a crack occurs, the table liner has to be replaced, and this requires 30% of the total maintenance cost of the vertical roller mill. Therefore, this study examines the fatigue failure of a table liner by plane-bending fatigue test, stress measurement test, finite element analysis and fatigue fracture analysis.

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