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Problems of realization of thermomechanical treatment for microalloyed-steel forgings are presented. The issue is discussed on the example of high-pressure-pump crankshaft. On the strength of numerical analysis results conditions for favourable strain and temperature distribution were determined. In addition, by means of numerical modelling proper perform geometry was designed, which allowed elimination...
In the course of ongoing development of mechanical joining technologies, different technologies were developed in the last years, where often the necessary die as contrary die was substituted by a flat anvil. Using the example of dieless clinching, the full potential of such process alternatives is visible. If the tools, as the punch or the blank-holder are modified and the necessary die is substituted...
The high-manganese austenitic steels are an answer for new demands of automotive industry conceming the safety of passengers by the use of materials absorbing high values of energy during collisions. The chemical compositions of two high-manganese austenitic steels containing various Al and Si concentrations were developed. Additionally, the steels were microalloyed by Nb and Ti in order to control...
The paper discusses the problems of material selection for the components of a vibration damper, i.e. the braids and flexible corrugated tube. Austenitic stainless steels were taken into consideration. The manufacture of braids and corrugated tubes was analysed in industrial conditions. The effect of variable technological parameters on final product quality was investigated, in order to optimize...
Cutting with diamond-coated wire is of a great importance at shaping hardly workable materials. As the time goes by, due to the tool wear, cutting abilities of diamond wire are reduced up to 50%. Because of variable cutting capacity, using the fuli machining capacity of a wire in its entire lifetime would require a highly complicated feed drive kinematics of machine tools. The decreasing cutting capacity...
Computational results are presented for uniform approach flow past emergency gate model, placed in a 2-D channel with free water surface, for two cases: (I) fixed gate and (2) gate moving perpendicular to the water flow. The calculations were made in the dimensionless system, for the assumed Reynolds number Re = 10. The velocity field and vorticity field were determined by vortex method. On this basis...
In the article, the structure and change in hardness of the welded Hardox 400 and Hardox 500 steels have been presented. It has been shown that structures of lower wear resistance are being created as a result of welding those materials in the "as delivered" state (i.e. with the tempered martensite structure) within the heat-affected zones. They are as much as up to 90 mm wide, and that...
Many constructional processes are carried out by machines working together and forming technological systems. An example here can be an earthmoving machinery set made up of excavators and means of transport. For process design purposes most important are the effectiveness ratios relaling to the profits and losses stemming from system use, i.e. the system efficiency per unit work ratio W(N); the index...
An Equivalent Single Layer Model for linear static analysis of multilayered plates is considered in the paper. The displacements field of the First Order Shear Deformation Theory is supplemented with the Murakami's function to emulate the zig-zag effect. The applied Reissner's Mixed Variational Theorem allows to assume an independent shear stress field of parabolic distribution in each layer and to...
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