Abstract
This paper presents the results of experimental investigation into the factors affecting tool wear in direct current method of hot machining alloy steels. Materials of different hardnesses were machined using several grades of carbide tools, over a range of cutting speeds and heating current. Considerable improvement in tool life was recorded. Results also indicate that, for a given machining condition, there exist optimum values of cutting speed and heating current for either maximum or minimum tool life, depending on the polarity of the cutting tool. Proper balance between the thermal conductivity, thermoelectric power and wear resistance properties of the tool material was found to be essential in prolonging tool life.
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