Vol 36, No 4 (2016)

The shaping of discrete abrasive segments for plane face grinding is considered, along with the necessary tools. Measures significantly reducing the costs on switching to discrete plane face grinding are identified.

Analysis of the nonuniform delivery rate from a multicylinder pump indicates its dependence on the working volume of the pump chamber, the diameter of the pistons, and their angular configurations with odd and even numbers of pistons.

A method is proposed for determining the decrease in the distance between nominally flat rough surfaces with similar hardness in the plastic deformation of the surface microprojections.

Friction and wear between the casing of the control rod and the reactor housing with cyclic rod motion and circulation of high-temperature molten lead in the annular gap.

The influence of impurities on the cold brittleness of materials is studied. A neural network is trained to model fatigue and brittle failure of samples. The neural network generates numerical sequences that evolve analogously to the fractal characteristics of acoustic emission studied in fatigue tests with various loads.

New software for calculating the parameters of Maltese cross mechanisms in machine tools has been developed at Stankin Moscow State Technical University. This software permits the construction of three-dimensional models in CAD systems and hence significantly improves the automated design of Maltese cross mechanisms.

A new approach to determining the cutting properties of a diamond tool with a single-layer diamond–galvanic coating is proposed. The method is based on determining the concentration of diamond grains in the working layer of the tool.

Indicators are mechanical or electronic measuring heads showing the readings by means of an arrow and a scale or a digital display. While mechanical indicators with an arrow and a scale have long been in use, electronic indicators with a digital display are more recent inventions, which offer high performance and the ability to measure absolute values. Therefore, it is expedient to clarify the benefits and optimal applications of mechanical or electronic indicators in manufacturing today.

The influence of tooth wear at the flank surface on the heat-flux density due to plastic deformation, chip friction at the tooth’s rake surface, and friction of the flank surface at the workpiece in end milling is considered. The dependence of the cutting temperature on the tool wear is obtained. The thermal field in the tool is calculated.

The selective laser melting of the fine structure of BrA9 aluminum bronze is studied. The optimal parameters for precise reproduction of the geometry of CAD models are presented.