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Yoshio SHIBUYA Synopsis : Tool steel dies were borided and heat treated. As the drawing materials with borided and unborided dies, aluminium wires of A2011 B, A 1070W and A5356 were used. The drawing characteristics (dimensional change of die and wire, coefficient of friction between wire and die) of the borided and unborided dies were compared. When the A2011B was drawn with borided and unborided dies, roughness, roundness of die and drawn A2011B surfaces with borided die were remarkably better than that of unborided die. The coefficient of friction between wire and die for drawn A2011B and A5356 with the borided die was less than that with unborided die. The boride layer did not show significant improvement for the severe adhesion between wire and die. Accordingly, it is noted that the borided die is useful under the condition of light adhesion occurring between wire and die.

Wear Resistance of Borided Drawing Dies