Roll optimization via numerical modeling of stress distribution

Abstract

Numerous FEM calculation models for load introduction onto rolling mill rolls have been developed. The stress that can arise during heat treatment as well as during roller use was calculated. This has made it possible to optimize roll use conditions and to develop new roll qualities. The following results are described: stress in the heat treatment of rolls, the calculation of large work rolls of a heavy plate mill, the counter-bending of rolls whose body length is greater than 6,000 mm, von Mises stress in roll necks, contact stress at the edge region of working and back-up rolls, stress distribution in pre-stressed composite profile rolls in use

Modern materials for cast rolls of hot strip mills

“…Roll materials are developed using Thermo Calc ® software [4][5][6][7]. Numerous Finite Element calculation models have been developed and used successfully [8][9][10][11][12][13][14][15] to calculate the stresses that can arise during roll heat treatment and during elastic roll deformation with the introduction of rolling forces and torques.…”

“…Cast iron with nodular graphite for core of compound rolls [8] Slika 6. Liveno gvožđe sa nodularnim grafitom za jezgro kompozitnog valjka [8] The mechanical properties of the nodular iron core materials are in the range of 615-625 N/mm² (tensile strength) and 820-1090 N/mm² (bending strength). The fatigue strength (10 7 rotating bending load changes) is approx.…”