Problems of Ensuring Quality of a Surface Layer When Producing Components From Hard-to-Process Heat Resistant Alloys

Abstract

We consider the study results of the hard-to-process titanium-based alloys processing on turning lathes. The influence made on the quality of the surface layer, characterized by the amplitude roughness parameters, by geometry, cutting tool properties, processing modes and dimensional wear is considered.Keywords: aluminum alloys, superhard synthetic materials, synthetic diamond cutters, cubic boron nitride cutters IntroductionThe new materials producing, their improvement and application depend on the level of society development, as one cannot meet the need in new machines and devices without using new materials.Modern enterprises of the aircraft and aerospace technology solve complex problems while designing new generations products (aiming to reduce the production and operation costs, including simplification of design and reduction of the parts and components number), requiring the materials development that would be able to function effectively under the conditions of long cyclical effect of high temperature aggressive media and their processing technologies [1]. These materials are to be heat-and erosion-resistant, they should possess high heat resistance, low density, and as well be resistant to the space environment factors effects. Today, traditional methods of new materials development have already exhausted their potential. For example, rising of the heat resistance of metal materials by increasing the alloying elements content, and of the thermochemical hardening technology has reached its limit capacity. The same can be said for ceramics. Today, traditional methods do not allow to increase resistance to thermal shocks and thermal cycling that arise in the operation of critical units of aerospace technology [2]. A large potential for enhancing constructions operational characteristics in the field of aircraft propulsion engineering is in the use of promising titanium alloys [3]. Analyzing existing research and practical solutions of machining titanium alloy raw workpieces and maraging steels in our country, we can conclude that increasing productivity and strict deadlines for the rocket and space equipment (RSE) manufacture require substantial increase in

Machinability of Heat-Resistant Titanium Alloys during Turning

“…To ensure the quality of manufacturing of parts from titanium alloys, it is necessary to use appropriate equipment, rational cutting conditions and cutting tool geometry [17], which allow obtaining the required dimensional accuracy and height parameters of surface roughness [18]. For this, it is necessary to develop a mathematical model of the formation of errors, which will allow simulating errors [19,20] and selecting rational cutting modes that ensure the accuracy of machining parts made of heat-resistant titanium alloys at the initial stage of the technological process.…”

“…Data was processed in the Mathcad and STATISTICA programs. Below are some obtained power equations (12)(13)(14)(15)(16)(17) for the VT41 titanium alloy.…”

The effect of heat flow from friction forces on the surface of the billets

“…In [8], similar issues are considered for the manufacture of parts from hard-to-process heat-resistant alloys.…”

The Dynamics of Contact Interaction during the Cutting Process

“…Conditions ensuring sequence of the retention and sliding phases at interaction of the anterior surface of the tool and the rear surface of the tool with, respectively, the moving chip and the machined surface are formed by the system itself that potentially is self-excited one (Zhukov et al, 2016;Skvortsova and Nurulin, 2018;Völkers et al, 2018).…”