Hardening of the cutting tool by the coatings

T. S. Skoblo, S. P. Romaniuk, А. I. Sidashenko, R. M. Muratov

Abstract


Raising of problem. The existing operational stability of the thin-walled circular knife does not satisfy the requirements of the confectionery production and it has been provided with additional reinforcement by the nanocoating on one side (the cutting edge and the basis). At that the effective application is the coating on the basis blade both in the form of ribs, as well as continuous coating. For this the WC coating of 20…100 nm thickness has been applied. It was obtained by the PVD method using RF discharge in a stationary external magnetic field. Aim. Improving the efficiency of the proposed technology of hardening by spraying with the formation of WC nanocoating to provide the stable operation of knifes. Technique. A combined approach has been proposed for estimation of the coating influence on operation durability of knifes, which includes features of the formed type and number of phases in the coating, their properties and behavior during deformation, wear. For the description of the phase composition the new method of mathematical processing of the metallographic structure images has been proposed. Results. Features of the components distribution in the nanocoating at recommended processing parameters, which inhibit rapid degradation of the product during operation, have been studied. Scientific novelty. Nature of material behavior during the deformation before and after application of has been defined. Recommended parameters of hardening provide stability of the carbide phase W2C, WC, WС1-х and intermediate carbide containing the W–Fe–C. Practical importance. The new technological process of hardening of the thin-walled cutting tool by the WC nanocoatings has been proposed, which provides increasing of operational durability by 10…20 times compared with disk knifes of the source material (steel 65G after annealing and tempering). It was achieved due to the stability of the structure at operation, decreasing of the inclination to destruction of the cutting edge and resistance to fatigue damage of its main part. The coatings provided the increasing of corrosion resistance and self-sharpening of the knives.


Keywords


nanocoating; cutting tools; microhardness; structure; phase composition; self-sharpening; plastic deformation; damageability

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