Abstract
The extrusion tools can be easily split along the tool-metal interface as in a previous paper, and also the bearing chips set in the tools are designed to be exchangeable. The effects of the tool surface on the surface quality of extrusion products are examined, and the frictional mechanisms are investigated by electron probe microanalysis.(1) By the bearing chips of nitrided tool steel (N) and cemented carbide metal (G2), the contact mechanism at the tool-metal interface is slip friction, and the bearing surface is covered with adhesion of thin films composed mainly of Al and Mg. The products surface becomes the finest one.(2) By the five bearing chips of G2, N and tool steel (SKD 61), and with the carbide layers of TiC and VC on the tool surface, where chips surface is vertically ground to the extrusion direction, the materials adhered to fill up the grinding grooves are Al, Mg and Fe. The products surface is inferior to the cases of above result (1).(3) By the three buff-polished bearing chips of SKD 61, and with carbide layers of ere and TiC, the contact mechanism is stick friction. The adhesion grows into a band-like shape, and after its peeling off, the products surface becomes rougher than the second results. The main components of adhesion are Al and Si, and Fe and Si segregate on the products surface.
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