| Autor: |
МЕЛЬНИК, В. Б., РАДЬКО, О. В., ФЕДОРЧУК, С. В., ІЛЬЇНА, О. А. |
| Předmět: |
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| Zdroj: |
Problems of Friction & Wear; 2019, Vol. 84 Issue 3, p115-119, 5p |
| Abstrakt: |
The results of the study of lubricating layers formed by oils with surface-active additives on the quality of running-in of friction pairs with local contact under rolling with sliding are presented. Тhe effect of formic acid (surface-active substances - SAS) on the process of running- in in the mineral oil MK-8 medium, which intensively forms SOP already at room temperature, was investigated. The experiments were carried out on a friction machine SMC-1 on roller specimens made of normalized steel 45 with a hardness of HB 220, with a roughness of Rz of working surfaces of 4-3,2 microns, at constant contact stresses of 700MPa, a total rolling speed of VΣ 4,23m/s and a slip factor of 20%. Formic acid additive was introduced into MK-8 oil immediately before the experiments. The main parameters characterizing the running-in process were the thickness of the lubricating layer h, the friction coefficient fter. and the final roughness Rz. The method of kinematic friction pairs running-in in the lubricating medium is proposed, which is based on the principle of regulating the thickness and condition of the third body, which is effective for surface treatment when the main purpose is to minimize wear during the working period. It is shown that the introduction of SAS into oils suppresses the formation of self-generating organic films (SOPs), which leads to accelerated running-in of contact surfaces. The subsequent heating of the oil to the desorption or decomposition of SAS molecules after receiving the contact spot stimulates the formation of SOPs and contributes to the rapid transition to the load range corresponding to the minimum value of wear of the contact surfaces. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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