The endurance bending strength of gear for reducer is checked as well as it is deduced that it is seriously lower under the impact load of billet to work roll table so as to cause the problems of frequent gear tooth break and locating key cutting based on structure of reducer for work roll table of CCS rolling mill combining with causes of billet impacting work roll table and its impact load.Under the original working conditions, reasonable structure of reducer for work roll table is obtained by using the locating key with double keyways after quenching and tempering, increasing length and height of output shaft for reducer, changing size of base for reducer as well as increasing such parameters as maximum output torque and input power. After the optimization, endurance bending strength of tooth root and contact fatigue strength of tooth surface for reducer could meet the requirements of on-site working conditions.

locating key  /  torque  /  power  /  structure optimization  /  reducer  /  fatigue strength