Keyword: «hardness»

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.

The results of the research on the welding of the crankshaft of the KamAZ-740 engine by the PP-Np-35V9X3SF powder wire under the fused flux AN-348-A are presented to obtain a hardness corresponding to the specifications of the manufacturer.

The article presents the results of studies of the mechanical properties of prototypes of hard-alloy drilling inserts with ultrafine additives of magnesium spinel. In the composition of the prototypes, the percentages of ultrafine additives of magnesium spinel varied from 0.1% to 1.0%. The formation of a homogeneous structure in the volume was revealed. The absence of conglomerates of ultrafine additive powders on the surface was revealed. The work aims to analyze the mechanical properties of prototype drill inserts made of tungsten-cobalt alloys, which differ in the content of an ultrafine additive. In work, the instruments of the Central Collective Use Center of the Federal Research Center of the Yankee Scientific Center of the Siberian Branch of the Russian Academy of Sciences and CJSC "DV – Technology" were used. It has been shown that adding ultrafine powder of magnesium spinel to the charge composition of the tungsten-cobalt matrix increases density and hardness.

The study is devoted to solving the problems of abrasive wear of mining equipment parts operating in harsh Arctic conditions. The effectiveness of surfacing with direct current and modulated current was compared. It was found that the use of pulsed-arc technology reduces the burn-off of alloying elements in the melt. This ensures better transfer of the electrode's chemical composition to the surfacing layer and targeted adjustment of its properties. The results showed that the influence of the technology on the coating hardness varies depending on the composition of the surfacing material, confirming its potential for managing the quality of restoration of critical components.