The formation of the microtopography of the machined surface is one of the most critical factors in ensuring the effective operating properties of the product. These are indicators such as wear resistance, fatigue strength, provision of friction parameters of moving joints, etc. The most important reason for the formation of microroughness is vibration in the technological surface of the machine-tool-tool-tool-workpiece. This article is devoted to describing a new method of modelling the dynamic processes of machining.
Heat-resistant and high-alloy steels and alloys are difficult materials to machine. Optimizing the cutting parameters for such materials is a complex and multi-factorial technological process planning task. The paper describes the method of analysis of loading, thermodynamic and stress-strain state of a workpiece while cutting of typical representative of hard-to-cut materials (chromium-nickel alloy IN718) using finite element simulation. Influence of feed rate on cutting force and temperature in the zone of chip formation is given.
The article presents the formation of physical models of fittings of ventilation systems in the conditions of change of linear sizes and forms of adjacent sections of air ducts of ventilation systems.
The article presents a new gears cutting process – radial circular generating method and describes its multiple benefits for manufacturers of transmissions. The overall increase of efficiency is realized due to using a simple tool and the conventional gear tool machine for cutting gears of different types. In particular, this new method was used for cutting gears with the asymmetric profiles of wheel teeth, which allows considerably amplifying power transmission density, increasing load capacity, and reducing size and weight.
The article presents an analysis of rheological kinetics models of materials destruction in the process of cutting, based on the theory of dislocations. The criteria for ductile and brittle fracture mechanism of workpiece material during cutting are established. A system of equations, describing the behavior of termoelastoplastic workpiece in the process of its mechanical processing based on classical thermodynamic analysis, is given.
Imitating studies with various materials, processing modes and cutting tool geometry are introduced. Based on research, the influence of various factors on the rheological pattern of cutting process is shown. The influence of mechanical properties of the material, chemical structure and microstructure on power rates in the cutting zone is studied.