Abstract
On the basis of vehicle–manufacturer feedback, a model is developed for ensuring the quality of cars’ electrical equipment in terms of electromagnetic compatibility.
On the basis of vehicle–manufacturer feedback, a model is developed for ensuring the quality of cars’ electrical equipment in terms of electromagnetic compatibility.
The inelastic deformation in one cycle at stress corresponding to the endurance limit is considered. A sharp drop in plasticity and inelastic deformation is noted before failure. These characteristics are studied as a function of the mechanical properties of the material and its stress state determined using temperature and structural coefficients of stress concentration.
The article presents an algorithm for calculating the parameters of a digital model of a 3D surface in accordance with GOST-25178-2–2014.3267 “Geometrical Product Specifications (GPS)” on the example of a surface treated with an abrasive tool. Microgeometry of working surfaces of machine parts is an important factor in determining their durability, reliability, and efficiency in operation. The developed models enable control over the parameters of the treatment process at the stage of design of the technological process with the aim to ensure required geometric parameters of the machined surface. he problem is a relevant issue because surface microrelief characteristics determine the area of real contact, the coefficient of friction, the ability to hold lubricant, and the ability of the working surface to withstand wear under load. Optimization of microgeometry can result in reduced wear, improved efficiency, and increased reliability of mechanisms.
In the design of new vehicles, considerations of quality assurance must take account of electromagnetic compatibility. Issues of electromagnetic compatibility are analyzed in the present work.
Conical end mills are widely used as cutting tools in the production of components for the aerospace industry and for machine building. The helical channel of conical mills is more complex than a regular cylindrical channel. Its core diameter and profile angle are variable. The operational efficiency of the mill depends directly on those angles and on the rake angle at the edge. Multidimensional tool motion is required to produce conical helical channels; recalculation is necessary at each stage of the motion. Determination of that motion calls for comprehensive solution of the profiling problem; some new developments in such research have appeared recently. In the present work, the change in the shaping configuration in terms of the cut layer width is analyzed. Recommendations are made regarding the determination of the shaping configuration; its influence on the shape of the machined sections at the front and back of the mill tooth in the helical channel is considered. The most important approaches to machining conical end mills are discussed. On the basis of the analysis, a new algorithm is derived for positioning the grinding wheel with respect to the mill axis on the basis of its contact parameters at a helical conical surface.
Options for pattern cutting of rolled products of different standard sizes from different suppliers are considered and the main pattern cutting parameters are analyzed. The selection of the optimal cutting option is shown, which reduces the cost of the technological process, increases productivity, and minimizes material consumption and the number of operations.
The load capacity of Novikov gears and involute gears of varying accuracy is assessed. It was shown for the first time that it is possible to replace high-precision involute gears with ground teeth with Novikov gears of medium precision.
For additive manufacturing of highly reliable and highly expensive metal products for the aerospace and nuclear industries, where there is no room for defects, methods of real-time non-destructive testing are particularly important. One of the methods of this kind of quality control is X-ray computed tomography, which determines the internal structure of the manufactured layers of the product at any point within its volume based on an analysis of tomographic images of these layers. The article presents features of application of the image reconstruction methodology designed for fan-beam X-ray computed tomography to cone-beam radiation and spiral scanning.
SolidWorks Simulation software is used to analyze the stress state of one-sided butt welds that contain a convex element and a gap (incomplete fusion) at the root of the seam. Convexity of the weld seam intensifies the stress concentration due to the gap and increases the maximum stress in the weld. To minimize the stress in the weld, its convexity must be completely eliminated, and a groove of depth equal to the gap height must be made along the whole seam.
The helical surfaces on the cutting section of end mills determine their operational efficiency and the product quality. Preparations for machining those surfaces include determining the position and orientation of the standard grinding wheel. That is a challenging problem, since the standard wheel does not share a single cross section with the helical profile. Consequently, the usual methods do not permit the determination of a broad set of geometric parameters for a specified setup. Therefore, in the present work, a mathematical model is proposed for the multicoordinate grinding of helical surfaces on high-strength tool materials. The model takes account of wheel profiles with different curvature, dimensions, and shape; the characteristics of multicoordinate wheel motion in the tool coordinate system; and the shape of the machined surface in the helical channel. The model is universal and greatly facilitates the development of shaping configurations for helical surfaces of different profile.
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