Calculation of the technological parameters of constrained extrusion of unequal channels is considered, for plane deformation, with misalignment of the punch and matrix; the extruded material may be of hardening or nonhardening type. The analytical expressions obtained permit determination of the total and specific deforming forces and the height of the walls that are formed.
The article considers types of contact fatigue of vehicle transmission gears. It is shown that the main operability criterion for transmission gears of tractors and heavy-duty vehicles is deep contact fatigue of tooth surfaces. It is established that the procedure for calculating gear durability presented in GOST 21354–87 has significant errors, which results in significant uncertainty of the calculations. A procedure for calculating gear life expectancy that incorporates fatigue resistance of the tooth material and is based on the dependence of the limit of deep contact endurance on the hardness and structure of the hardened layer is proposed. An example of calculating gear life expectancy is considered, and the results are compared with bench test data.
The study considers laser peen forming (LPF), which involves deformation of a thin plate by a shock wave. The LPF process is simulated using the finite element method. It is established that the maximum plate bending curvature can be achieved by adjusting the laser spot overlap ratio, the number of laser pulse repetitions, and laser beam power density.
An innovative technology is described for improving tool performance in external turning of stainless steels: the application of new coatings to VK8 hard alloy tools. Tool performance is determined from the life of the replaceable standard cutting inserts. The working life of the inserts ends when the wear at the rear face reaches the limiting permissible value (0.5 mm). Such coatings may increase the working life of VK8 alloy tools as much as threefold, without impairing the productivity or the surface quality of the workpiece.
The problem of operational repositioning of saw modules on the shafts of the saw unit is solved to obtain lumber of different sizes by changing the distances between the modules. A scheme of a self-locking manipulator is proposed, which provides rigid temporary fixation of saw modules in a specified position.
The study proposes compositions and manufacturing technology for novel composite materials based on Ti–6Al–4V titanium alloy powders and presents the results of studying the processes of formation of the structure and properties of these materials. The results of the study of composites fabricated from bimodal powder mixtures Ti–6Al–4V–(Cu–Al) by direct selective laser melting reveal their potential of significantly improved strength properties compared to the base material.
The analysis focuses on how the physical parameters of the attachment–workpiece and tool–chuck systems affect the stability when milling aviation materials that are hard to machine. Methods of stabilizing the milling process in terms of vibration are outlined, as well as means of increasing the productivity without damage to the equipment. Examples are given of stable and unstable machining of titanium alloy by end mills and its influence on the cutting process.
The current state of the global and Russian machine tool industry is described. The kinematic differences between Russian and imported machines for the polishing and finishing of high-precision surfaces are itemized. A prototype Russian polishing system is discussed, noting its technological features, ergonomic design, and operational safety.
The article considers problems of the functioning of distributed systems in the aviation industry by sub-sectors in the aspects of their organizational (on the example of 37 companies) and technical (on the example of the I-21 project) components, with consideration to stages of the product’s life cycle. Approaches to solving the identified problems using a methodology based on specific indicators are also proposed.
A hardware–software system for indirect monitoring of a cutting tool is proposed; this system is based on the level of vibration in machining and observation of the condition of the equipment. The system includes a server, operator panels, and diagnostic modules. This system is compared, in terms of capabilities, with other MDC/MDA products on the market.
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