SOME FEATURES OF THE PROCESSING OF HIGH-STRENGTH TITANIUM ALLOYS BY COLD PLASTIC DEFORMATION

Abstract

he purpose of this work is to develop a method for reducing the tendency of the machined surface of products made of high-strength titanium alloys with a carbide tool when processed by cold plastic deformation under conditions of high normal and tangential contact stresses, namely, according to the technological scheme of deforming broaching.

The study used the methods of strain measurement and profilometry. The technologies of glow discharge nitriding and thermal diffusion nitriding were used.

It is shown that modifying the machined surface of parts by nitriding allows seven deformation cycles to be performed at a contact pressure of up to 4 GPa without setting. At the same time, the roughness of the machined surface is reduced by 2-5 times.

The results obtained can be used in further research aimed at developing high-performance technologies for finishing the internal surfaces of tubular products made of high-strength titanium alloys. Specifically, they can form the basis of technologies for finishing aircraft hydraulic cylinder housings and other products, including special-purpose ones.

The originality of the approach lies in using nitriding of the treated surface of the products not to increase their surface strength, but to provide them with antifriction properties that provide the necessary level of their resistance to seizing with the tool during deformation broaching operations.