Alexander Vasil'evich Mikhailov

Peculiarities in assurance of functionally-directed technologies of manufacturing parts for marine engines

There are presented functionally-directed technologies at manufacturing parts for marine diesel engines for more efficient ship maintenance and scheduled repair carrying out. The peculiarities in ship repair organization are shown, there are shown differences in functionally-directed technologies allowing the realization of specified properties of parts. The elements of a support system are shown and characterized.

Group Processing of Screws in Tool Modules during Transportation

This work is devoted to the development of design methods for flexible rotor lines that will combine several large-scale productions of products of different sizes in the mass diversified flow of goods by processing several sizes of goods in each group tool module. Performed work provides an opportunity to increase productivity of flexible rotor lines in 3-4 times by increasing the number of goods in 2-8 times by processing several sizes of products in each group tool module. The developed design methods for flexible rotary machines and group tool modules allows you to create high-performance systems based on combining a group-volume production of products of several sizes in the mass diversified flow of goods. Organizational and technological bases of flexible rotary machines creation are first developed in this paper. Every tool module handles multiple sizes products in these new machines. New links have been established between the structural elements of flexible rotary line with the group tool module and a combination of flow characteristics. That allows us to determine the structure of the flow of goods by combining several large-scale productions of products of several sizes in the mass diversified flow of goods.

Nature of the Elastic Grinding Tools Working Surface in the Contact Area with the Workpiece

Formation of the ground surface is the result of the interaction of the cutting elements of the diamond tool with the material being processed, so the nature of the working surface geometry of the grinding wheel (WSW) has principal value on processed surface quality. One of the main parameters that characterize the geometry of the WSW is the law of the grain distribution vertex in height. However, statistical models do not reflect the real picture of the tool interaction with the material being processed in the modelling process of grinding tool on the elastic ligament used for final operations. In the process of contact with the material being processed each diamond grain is moved with an adjacent block ligament, changing the position of the cutting vertex relative to both the midrange cords level and the other grains vertexes. As a result the nature of the grain vertexes distribution changes and the conditions of interaction with the material being processed change too. Studies have shown that the density distribution in height of diamond grains elastic grinding tool vertexes in a static state can be described by different distribution laws. For practical use in the calculation of the processed surface roughness and processing capacity is sufficient to approximate the distribution in height only the most protruding grains. In the area of contact with the processed material the distribution density of the grains elastic tool in height significantly differs from the static characteristics and is defined by the elasticity degree of the grinding tool ligament and machinability index of the workpiece material. The obtained results can serve as initial data for the calculation of the processed surface roughness.