In order to study temperature field on the interface between die and blank at die radius zone during cold sheet forming, the temperature field during DP590 sheet Ushaped bending was calculated by using a thermomechanical coupled static implicit finite element model, and then the influences of the four key processing parameters (relative radius of die, blankholder force, forming velocity, and friction coefficient) on the maximum value of the temperature field were analyzed. The investigation shows that the maximum temperature on the interface increases with the decrease of the relative radius of die, the increase of the forming velocity and the increase of the friction coefficient, respectively. Blankholder force has obviously different influence in different forming phase: in the initial transient phase, the blankholder force has almost no influence on the maximum temperature, while in the steady phase, the maximum temperature increases with the increase of the blankholder force in a certain range, but once the force comes above this range, the max value does not increase with the blankholder force.
