抄録
Aluminum and its alloys have widely been utilized as the forged products in the various industries. However, few studies have been reported on the fundamental investigations such as deformation process and on the effects on metallurgical and mechanical properties.
In this paper, the experimental results are presented on the deformation process of open-die extrusion.
Two sorts of measuring methods were used for the study of deformation process in this work. One of them was the measuring of the change in contact pressure between the specimen and the inside surface of die during the forging with sensitive pin (the sensitive pin method); and the other was the measuring of the difference in size and shape of the specimen between before and after the compression (the external form method).
The both methods were alsways attempted for the specimen of the same shape and the authors investigated the deformation processes under various conditions by means of the results of the both methods.
The results of experiments were summarized as follows:
1) The change in contact pressure during the forging was continuously measured by the sensitive pin method.
2) Open-die extrusion process in the forging consisted of three stages. The change in contact pressure was observed during the deformation at each stage.
3) The both results of the two methods were in quantitatively good agreement with each other.
