Modeling of Maximum Spread Variation of Workpiece under High Speed Deformation in Rod Rolling Process
A maximum spread model dependent on rolling speed is proposed for rod rolling process following the analysis of deformation behavior of steel under compression and four-pass continuous high speed rod rolling test. Results reveal that amount of spread depends on a region which restricts plastic flow of workpiece during deformation. Increasing rolling speed (strain rate) leads to decrement of friction coefficient and, in turn, enlarge deformation-restricted region in the workpiece and consequently reduce amount of spread during deformation. Hence, the rolling speed dependent spread model could be expressed in terms of flow stress, which is a function of strain, strain rate and temperature and finally the model is proposed in a concise form.
S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim
Y. S. Lee "Modeling of Maximum Spread Variation of Workpiece under High Speed Deformation in Rod Rolling Process ", Key Engineering Materials, Vols. 345-346, pp. 967-970, 2007