HIGHER VISCOSITY OF LOGWAY FRACTURE FOR WIRE DRAWING
Abstract
The paper presents results of the investigations on evaluation of logway resistance which are used for drawing cord wire made of tungsten-containing hard alloy. It has been shown that complicated loading conditions lead to fracture of a tool surface and these conditions are attributed to the action of various mechanisms: wearing due to high local stresses and deformations, fracture due to stretching stresses at logway expansion, small-cycle fatigue, heat shock etc. It is proposed to evaluate logway serviceability by such indices as hardness, strength and fracture viscosity and an amount of bundle and size of tungsten carbide grain influence on these indices. As an alternative material to a hard alloy it is advanced to use a diamond-silicon carbide composite. It is shown that a preliminary protection of diamond crystals with the help of a-SiC nano-coating makes it possible to obtain super-hard material. Its fracture viscosity can be compared with the fracture viscosity of a hard alloy and the composite out-performs a hard alloy in respect of wear characteristics that ensures rather good prospects for its application for manufacturing logways
About the Authors
V. N. Kovalevsky
Belarussian National Technical University
D. G. Sachava
Belarussian National Technical University
References
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Review
For citations:
Kovalevsky V.N., Sachava D.G. HIGHER VISCOSITY OF LOGWAY FRACTURE FOR WIRE DRAWING. Science & Technique. 2009;(1):22-26. (In Russ.)
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