Keyword: «grinding»

The technique of definition of grains tops on a working surface of a tool is considered in the paper. Under the action of various processes of wear, the distribution of grains tops forming the relief of the working surface of abrasive tool is constantly changing. Features of formation of a working surface of circles of various characteristics are shown at grinding on various depths. Also the quantity of the grains, which have left a trace on the processed surface is defined, law of their distribution for the first time is established. The results of the research of a working surface are resulted at flat grinding of stainless steel Р6М5. Efficiency increase of production is proved.

Flat grinding process of ШХ15 steel standards with the periphery оf a straight wheel is prоbed. The methоd of оptimum standards surface grinding conditions determinatiоn is presented.They prоvide achivement оf the set processed surface quality requirements with the maximum efficiency. Mathematical mоdels оf such cоmpоnents as cutting fоrce, grinding cоefficient and prоcessed surface rоughness according tо sample width are received by methоd оf a full-scale factоr experiment. Input factоrs are grinding prоcess оptimizatiоn parameters. Mathematical mоdels оf оutput factоrs are used fоr restrictiоn оf оptimizatiоn parameters accepted values area.

Transmission electron microscopy and Raman spectroscopy was used to study the effect of modification by annealing in air on the morphology, phase composition, and structure of primary particles of nanopowders obtained by grinding natural diamond and detonation synthesis. Stepped annealing of nanopowders was carried out at the following temperatures: 200, 300, 400, 500 and 550 ℃. It was shown that heat treatment in air at temperatures of 400–550 ℃ leads to the removal of structural formations of primary particles of both DND and NND nanopowders consisting mainly of non-diamond carbon in the sp2 state and amorphous carbon in sp3 state.