EVALUATION OF TEMPERATURE AND HEAT-TRANSFER CONDITIONS AT THE METAL-FORMING INTERFACE

During the forming of metals, the contact resistance between the workp iece and the die can have an important influence upon the temperature distribution in the material being formed and on the quality of the en d product. In order to predict the contact resistance, a technique is being developed which will enable accurate determination of the contac t resistance. This technique involves direct temperature measurement a t the die/billet interface during deformation and subsequent use of in verse heat transfer model to calculate the contact resistance. The pre liminary results indicate that the method can provide a reliable means of predicting the contact resistance.