温熱間鍛造における接触熱抵抗の簡易評価式

概要

論文の詳細を見る
In order to estimate the transient thermal response between a die and a workpiece in hot and warm forging, we proposed a new estimation model for finite-element analysis. A uniform air film was introduced into the model to evaluate the thermal contact resistance rc of the interface. We analyzed the wide range of contact conditions experienced in forging processes and proposed equations to quickly evaluate their γc for analyzing the temperature fields of the die and the workpiece in practical forging processes. ( 1 ) The γc was mainly influenced by the microstructure of the workpiece surface and the contact conditions which vary during the forging process. ( 2 ) The workpiece covered with an oxide film and the die coated with a hard metal film had varying γc depending on the heat conductivity of the films. ( 3 ) The relative movement of the workpiece on the die surface negligibly reduced γc, but if the frictional heat created by slipping is distributed on the workpiece surface, γc must be modified appropriately.
一般社団法人日本機械学会の論文
1995-09-25