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This paper deals with an adaptive visualization method of the thermal state in machining operation. The visualization is expected to enhance the recognition ability of operators. First a framework of thermal state visualization is proposed. Then, a sensor-configured heat conduction simulation is proposed as an estimation method of a machining workpiece. The method is based on the association of sensed data with the process simulation. As an implementation of adaptive estimation, a prototype system is developed. A configuration of the prototype system is illustrated. Results of a simple example are shown. The results indicate the possibility of adaptive estimation. Finally, a conclusion and future works are presented.