卷 36, 编号 9 (2016)

The thermal calculation of plates in hydraulic presses with ohmic heaters permits the determination of the heater parameters and their configuration in the plate so as to minimize the temperature difference over the plate’s working surface. Determination of the surface power of the heater is considered by an analytical method (for axisymmetric systems) and by finite-element analysis (for systems of arbitrary configuration).

The use of a pulsed variable-speed drive as a vibrational drive is studied theoretically and experimentally. The design of a transmission with controlled velocity fluctuation is considered.

Research on the wear of a PTFE–18Kh2N4MA steel pair indicates that the heat-distribution coefficient calculated from the Sharron formula for the polymer is too low. The transfer of polymer to the steel must be taken into account in determining that coefficient.

The eigenfrequencies of the flexural–torsional vibrations of band saw blades and the limits of the instability regions are determined as a function of the tool parameters and the operating conditions. Analytical equations describing the dynamic stability regions of the plane form of the band saws are obtained.

The development of a high-efficiency automated system for continuous electrochemical synthesis of reagents used in water and wastewater purification is considered.

Resource management in order-based manufacturing production may be organized in terms of the preliminary, planned, and actual cost of products. Approximate calculation of the preliminary cost of individual items (orders) is ineffective. That considerably impairs plant economics. The preliminary, planned, and actual cost of products may be calculated by means of methods and models incorporated in software for an integrated automated information system at a manufacturing enterprise, which has already performed well in Russia.

Approaches to improving the design of metal-cutting machines are discussed. The most important problems relating to the precision, thermal processes, dynamic modeling, and diagnostics of metal-cutting machines are considered.

An algorithmic model is proposed for calculating the blunting area of an abrasive grain in grinding. The model permits prediction of the blunting of an abrasive tool in a broad range of operating conditions. It is recursive: the nonlinear feedback with respect to the blunting area itself is taken into account. The model permits prediction of the performance of abrasive tools in different conditions. That is especially important in manufacturing today.

The influence of the conditions of wire electric-discharge machining (EDM) on the cut width in the machining of 09G2S steel is experimentally investigated. The relation between the cutting power and the cut width is obtained. It is shown that, with reduction in the power, more thermal energy is concentrated at the machined section of surface, the probability of secondary spark discharges increases, and consequently the cut width increases.

Attention focuses on the maintenance of precision in gear-shaping machines when the time factor is taken into account. A useful mathematical model is described.