Abstract
In machining of the 4th group alloys (Titanium and Zirconium) as well as of refractory alloys, it seems that the tool cutting edge angle χ has an important influence on the chip's geometry and on the tool life. The study presents and verifies a relationship between the tool cutting edge angle χ and an anisotropy ratio defined from mechanical properties of the workpiece material. In its theorical part, the study presents the research of the direction with the largest instability of shearing and it also defines an angle i as tg i is equal to the square of the anisotropy ratio. In its experimental part, the study verifies that for the tool cutting edge angle χ, which is equal to χ, the chip is an elemental chip propelled away from the workpiece which represents the optimal chip for the automatised production.
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