The paper presents experimental dependences of influence of diamond grinding modes on cutting forces during machining of structural ceramics.
The modern power hydraulic actuators which have found the broadest application in various areas of equipment, often perform so responsible functions that safety of machines operation depends on their reliability. The review of existing hydraulic systems of load-lifting devices showed that practically all of them have the same schematic hydraulic diagram which main disadvantage is the low reliability that quite often leads to emergence situations even including humans death. This paper develops recommendations about the increase of reliability of such devices due to reservation of units and knots of hydraulic systems.
Peculiarities of plasma cutting, its advantages and disadvantages are considered. There are considered technical capabilities used plasma installation and analyzed the results of the conducted research.
Material of workpiece and structural parameters of the device for combination of machining and surface plastic deformation have a significant effect on surface roughness of unstable components such as hollow cylinder.
Paper discusses a way of increasing the durability of spur gears by reducing the dynamic loads through dividing tooth surfaces into several equal parts.
Paper shows a way to design the cutting part of geometrically-complex tools, based on the provisions of a Boolean algebra with the ability to create a virtual equivalent of grinding equipment. It allows at the initial stage to obtain information about final product with the ability to change its parameters.
The article describes the features of hardening metal matrix composite materials with the implementation of small amounts of nano-sized reinforcing additives.
The article considers the issues of optimizing the layout of multi-axis machine tools for multi-dimensional processing using various criteria. Optimization of layouts is implemented using CAD/CAM/CAE/PDM systems, SolidWorks and MS Excel.
The article deals with the problems of creation and functioning of human-oriented control systems that use contactless gesture interfaces. The analysis of existing approaches and assumptions was made and the most effective approaches to build such systems were underlined.
The article considers conditions of worm milling cutters engagement with the profile of the teeth of the cylindrical wheel when involute. The construction of modular and integral worm cutters is described. Cutting conditions are analyzed: cutting speed and axial flow.
The paper presents a method of calculating deformation forces when pulling holes of the parts by working elements of broaches with regular microrelief with the actual area of contact of the interacting surfaces.
Modern mechanical engineering is impossible without information technology. The machines are representatives of the symbiosis of mechanics and electronics. Despite of the abundance of software for calculations, solutions often do not coincide with the real test. A method is developed to determine the effect of vibration on the cutting process, which allows to solve some of the appearing problems.
The paper presents the results of a comprehensive research aimed at the identification of opportunities for process control parameters precision forming of critical components of controlling aggregates of aircraft engines using advanced methods of directed surface plastic deformation with a diamond indenter.
There is presented the development of the experimental thermal booth for research and model (similar to full-scale) testing of materials and coatings for simulating complex heat transfer with a substantial portion of the radiant components in various types of combustion chambers during operation turbine elements, a variety of heat and power units, aero-space vehicles.
The experience and results of research of hardening modes of steel products 40H13 in a vacuum, in a single-unit and small-scale production is described. There is shown the effectiveness of high-temperature hardening with outdoors cooling of vacuum chamber. The mathematical model of the cooling of the vacuum chamber is developed. It allows the investigation of cooling modes and options for the construction of the vacuum chamber.
The paper presents results of research on abrasive wear of the coating WOKA PTA-6040 formed by plasma powder welding with arc currents 70A, 85A and 100A. Some patterns of wear of the deposited material due to the peculiarities of distribution in it of carbide phase at various currents of plasma arc are identified. The changes of the microstructure, the height of the elemental composition of the deposited layer, as well as sedimentation process of carbides are underlined and their effect on the wear resistance of the deposited material is shown.
There is considered the possibility of optimizing the process of combined machining by cutting and surface plastic deformation using the new solutions on design of cutting and plastic deformation of parts of the device for combined machining.
The paper presents one of the methods of nonproductive machine time optimization of tools during milling of parts with complex surfaces on combined machine. In particular, there was described an algorithm to minimize the idle movements of spherocylindrical and conical cutters. Calculations were performed on the test parts with complex surfaces.
The article describes the various methods of self-centering bands in units for various purposes. Particular attention is paid to the structural features of the scheme based on the principles of self-installation and eliminating redundant links in a statically determinate system.
The paper discusses the rational properties of a solid alloy, greatly enhancing efficiency of nanoscale multilayer-composite coating (NMCC), deposited on the working surface of the tool. A balanced combination of properties of solid alloy and NMCC significantly improved lifecycle of tool, when machining heat-resistant nickel alloy.
The paper proposes a scheme of testing with a uniform deformation for measuring the properties of multi-layer material with viscoelastic connective layer while performing experiments on the shift. Experimental results showing the features of large shear deformation of a viscoelastic layer and the elastic layer in the samples are provided.
The article discusses the application of the surfaces micro-arc oxidation competitive method for parts made of titanium alloys.