Browsing by Subject "lubrication"

Now showing 1 - 3 of 3

Access status: Open Access ,
Effect of selected working conditions of cutting picks on their wear during the mining of hard rocks
(2010) Kotwica, Krzysztof
The article presents the influence of work conditions of rotary-tangential picks on their wear while compact rocks mining. There was mainly presented the influence of applying high-pressure support and spraying the tangent-rotary tools with water jets on their quantitative and qualitative wear during conducted laboratory tests in comparison to tools operating in dry conditions. There was suggested and presented a solution of holders lubricated with water under pressure to provide proper conditions of tangent-rotary tools work in the clamp. The results of laboratory tests of rotary-tangential picks fixed in the folders were presented and compared with results of picks only supported or sprayed with high-pressure water jets.
Access status: Open Access ,
Lubrication conditions influence on the filling process of die impresion in complex forging extrusion of A95456 alloy
(2009) Sińczak, Jan; Chyła, Paweł; Bednarek, Sylwia; Łukaszek-Sołek, Aneta; Skubisz, Piotr
In the paper was analysed the rheology of metal flow in complex die forging process with closed-die with domination of direct and indirect extrusion beside different lubrication conditions on the die impression. It was found that apply of suitably diversified lubrication conditions brings favourable effect in form of decrease of the deformation energy and simultaneously favourable influence on the uniform deformation in whole volume of the forging.
Access status: Open Access ,
Podnoszenie oleju w wirującym cylindrze w aspekcie smarowania górnych łożysk
(Wydawnictwa AGH, 2005) Siemek, Jakub; Salwiński, Józef; Łuczyński, Stanisław; Lepiarczyk, Dariusz
Failure-free operation of mechanisms with shafts situated in varians positions, in this number reducing gears, motoreducers and compressors depends on the method of bearings lubrication and cooling. Solution of that problem is of high importance for proper operation of reducing gears. The problem is significantly more complex for gears with vertical position of shafts. The simple bath lubrication is poorly efficient. Known technological solutions are based on special pumps to force the oil circulaton or external lubrication systems are used for this aim. One of methods to solve this problem is the rotorless pump embedded into the shaft. This design has been developed in the Department of Machine Design and Terotechnology in the AGH University Science and Technology. The behaviour of oil been observed in the rotating cylinder and it was stated that centrifugal forces cause convection of oil particles along the internal surface of the cylinder. The new lubrication system has to provoke continuous flow of oil the gear is filled, up to the upper bearings then to the area of teeth cooperation. The model of oil convection in the cylindrical chamber made in the shaft has been developed to describe the oil convection height in the new self-lubricating system. Mathematical relations have been formulated for determination the basic dimensions and parameters of the new system. The model and bench tests of this system are presented with application of mineral oils VG46 used in lubrication of the light, medium and heavy loaded toothed gears. The results of tests confirm that the new self-lubrication oil system efficiently lubricates the upper bearings of toothed gear with vertical shafts. Oil transported in this way may be also used for the gear mesh lubrication.