Abstract
A method of the direct observation of contact conditions at the tool-metal interface, by means of the special designed extrusion tool which can be easily split along the tool-metal interface, was developed. The following results are obtained:(1) When the surface asperities of materials that adhered to the die bearing were smooth, fine surface extrusions were obtained. The adhesion aspects are effected by the mechanical finishing conditions of bearing surface, so excellent surface extrusions were got with the die grinded perpendicularly to the extrusion direction.(2) With the increase of the bearing length, the range of adhesion becomes more wider, so frictional resistance and extrusion pressure increase respectively, in this stage, the surface roughness of extrusions becomes large. While it was about zero (edge shaped), rough surface extrusions were obtained, because the adhesion could be formed in the shape of a broken line on the bearing.(3) With the increase of the extrusion temperature, the roughness of the extrusions becomes large, the reason of which is that adhered materials to the bearing surface make plastic flow to have long and narrow adhesions.
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