Vol 39, No 11 (2019)

A method is proposed for processing information supplied to a web server, by means of SQL and PHP language tools. As an example, a monitoring protocol for a circuit board at a monitoring position is presented. It is possible to reduce the information load on technologists and to increase productivity by faster assessment of product quality.

The manufacture of blanks for polymer-composite joints by winding and subsequent installation on the primary housing of a solid-fuel rocket engine is described. A device for winding and installing such components is considered.

A hybrid system for short-term energy storage has been developed. It includes lithium-ion batteries for steady operation and supercapacitors for transient operation. The store may be used in systems with renewable energy sources, in electric vehicles, and in uninterruptible or backup power supply systems for consumers drawing large currents. It may also be used for energy recuperation.

Expressions are derived for determining the cost of industrial products in small-scale production. Information technology may be effectively used to decrease the cost of multicomponent products, by decreasing the dimensional tolerances in machining.

The terminology relating to surface shaping by cutting is considered. Gaps in the standard terminology give rise to different terms for the same concept and different concepts described by the same term in the technical literature. The concept of the initial tool surface needs to be eliminated, since it covers three independent concepts: the initial generative surface; the initial generative cutting surface; the initial supply surface. Definitions are provided for concepts such as the generative and initial generative lines of tools; the initial surface to be machined and the final machined surface and others. Those definitions should be included in the relevant standard (State Standard GOST 25762–83).

A mathematical approach to determining the number of teeth in a hybrid cutting–deforming tool—a shaver and roller system — with specified radius of curvature of its round tooth is outlined. The formulation of an algorithm for computer solution of the problem is considered.

The errors arising when thin-walled pipe is clamped in a three-jaw chuck are determined. The wraparound jaws are bored so that their internal diameter is consistent with the rated workpiece size. The workpiece is centered with minimal force. The position of the internal surface is measured with respect to 16 points, and then the clamping force is increased to the working value and the measurements are repeated. It is found that, under the action of the clamping force, the workpiece diameter is decreased by a factor of about 0.0004, while the center of the cross section is additionally shifted by about 0.0003 diameter.

Determination of the parameters of a shaver and roller system for finishing the round teeth of cylindrical gears is considered. Algorithms are proposed for selecting machining pathways appropriate to the gear crown of the shaver and roller system. A mathematical model is derived for calculating the radii of curvature of the convex and concave sides of its teeth.

The roughness is the most important characteristic of the working surfaces in machining parts. In the present work, the parameters of surface profiles formed by electric discharge machining (EDM) are statistically analyzed. On that basis, the influence of the margin selected in machining on the extent of the supporting surface is established. The results permit the determination of the relation between the length of the supporting frictional surface subject to external load and the length of the surface under the lubricant. That may be used in the creation of wear-resistant frictional pairs with high carrying capacity.

If holes are reamed in a thin-walled gas cylinder with welded reinforcing ribs and supporting elements characterized by residual stress and variable radial rigidity, the holes will be noncircular. The distortion is measured in the production line by means of a Mikron Vario five-coordinate milling center with a built-in Renishaw measuring gage. The noncircularity is found to be complex. To reduce the distortion, two-bore wraparound jaws may be employed in the chuck.