Krzysztof Adamczuk

Distribution of Hydrodynamic Pressure in Slide Bearings Applying Lubricants of Different Viscosity

The paper presents the results of tests on the distribution of hydrodynamic pressure in relation to the viscosity of a lubricant, the rotational speed of a journal and bearing load. Two different lubricants were selected for taking tests: base oil SN-150 and mineral engine oil. The distribution of hydrodynamic pressure was determined employing a device constructed for this particular purpose. It has been proved that the type of the lubricant, bearing load and, to a lesser extent, the rotational speed of the journal affect the distribution of hydrodynamic pressure.

Effect of Chemical Exploitation Preparation on the Tribological Properties of CuSn10 Bronze within the Friction Process

The paper presents results of tribological properties of the kinematic pair: X210Cr12 steel / CuSn10 bronze, lubricated within the friction process by engine oil SAE 20W/40, and by the same lubricant modified by chemical exploitation preparation. Research of tribological properties were carried out using the tester T-05 (type tester roll - block). Tests have been carried out in two stages. In the first order - friction force, wear of the kinematic pair and the temperature of the friction area have been determined. The objective of the second phase was to micro roentgen spectral analysis of the surface friction zone. On the basis of these studies, the analysis of the elemental composition of the surface layer in the track wear have been made. The modification purposefulness of lubricant SAE 20W/40 by chemical exploitation preparation has been shown.

The Effect of EP/AW Additives in Emulsion Mist on the Geometric Structure of the Machined Surface during Carbon Steel C45 Turning

One of the problems of metal alloys machining in view of the environment protection is the use of cooling lubricants. From this viewpoint, it is preferred to limit the use or completely eliminate them from the cutting process. The solution may be the method of Minimum Quantity Cooling Lubrication (MQCL). The results of the machined surface roughness measurements of carbon steel C45 after turning when: machining for dry cutting, using cooling method MQCL and using MQCL with additives EP/AW have been presented. One used two anti-wear and antiseizure additives based on phosphate ester. Experimental studies have been planned according to the Parameter Space Investigation method. The application of EP/AW additives entered in the emulsion determined the ranges of cutting parameters at which lower values of selected roughness parameters were obtained in comparison with dry cutting. The lowest values of Ra and Rz parameter for variables of cutting parameters and creating emulsion mist within their whole range were obtained for cooling with pure emulsion mist based on boric acid and amine compound.