Treatment of Titanium Alloys Based on Preliminary Plastic Impact

Abstract

This paper proposed a new method for processing titanium alloys based on preliminary plastic impact. The reasons for the deterioration of the surface roughness of titanium alloys during machining are considered. This problem lies in the formation of outgrowths on tool cutting wedge, which leads to the cutting process taking place as in the titanium-titanium pair. The adsorption phenomenon leads to the fact that the outgrowth is saturated with gases from the environment, and a thick oxide film is formed. As a result, high temperatures arise during machining from 1100 to 1200°C, increasing the cutting forces P and friction Q, which introduce the technological system into an unstable self-oscillating process. The problem posed eliminated by the method of preliminary plastic deformation, which forms a local inhomogeneous structure. At the stage of processing the titanium billet, the cutting edge enters the region with a heterogeneous structure, destroying the chips and growth with an oxide film. Since most of the temperature, about 80% takes away with the chips, the amplitude of the self-oscillating process decreases, which reduces the surface roughness of the processed titanium alloys.

Machinability of Heat-Resistant Titanium Alloys during Turning

“…For a numerical assessment of the degree of dependence of cutting parameters and surface roughness on cutting conditions and the geometry of the cutting tool, the corresponding empirical equations are included in the mathematical model (5)(6)(7)(8)(9)(10)(11):…”

“…The study of the cutting process is of fundamental importance for the rational choice of cutting modes [3,4]. The scientific literature widely represents unique properties of titanium alloys [5][6][7], problems in the machining of these materials [8][9][10] and possible ways to solve them [11][12][13].…”

Angular Rolling of the Hollow Flanges of Pipe Joints

“…Radial extrusion technology makes it possible to obtain a flange at almost any part of the pipe workpiece. However, the set of the required volume of metal to form a flange with a size ratio b/s ≤ 4.1 will require at least 4-6 transitions and is accompanied by defects [13], such as cracking, foldings, and loss of workpiece stability.…”