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A model of antifriction effect of single grain of lead inclusion has been submitted. Both tribology and orthogonal cutting tests have been performed to validate the model.
Disk brake mechanisms are widely used in automobile construction at present, their major advantage being high stability. With the brakes stability depending, to a great extent, on the temperature mode, it is of practical importance to do some research into the latter. Wide application of computing thermal physics in the field of bearing technology based on modem thermal models and the means of their...
The paper presents results of the experimental research of the coefficient of the friction two contacting elements of surface from the titanium alloy with a steel or from the titanium alloy after milling cutter or drilling process or shot peening and also following hard covering anodic oxidition process or protective coating of electrophoresis process depending on the load and the speed.
The outcomes of simulation of heat fields by a finite element method at milling austenitic steel 00H17N14M2 are reduced. The solution of the task of non-stationary nonlinear heat conduction has allowed finding allocation of temperatures in surface layers of a detail of the composite form in velocity function of cutting and position of blade of a burr.
In this elaboration have been presented the tribology tests of layers have been obtained by chemical vapour deposition. The tests surrendered layers contained: carbon, hydrogen and nitrogen (a-C:H - an amorphous hydrogenated carbon, a-C:H:N - an amorphous hydrogenated nitrogenated carbon). The tribology tests contained the abrasive wear and coefficient of friction. Peculiarly occupy oneself with layers...
The paper presents an analysis of influence of the preliminary imperfection on the form of equilibrium path of bar compression in the range of post buckling state. In the second part the paper presents the short characteristic of nonlinear numerical analysis used to the stability problems of structures. The MSC AFEA (Advanced Finite Element Analysis) and MSC PATRAN constitute the base to numerical...
Deformation processes of Cu-Al2OS composite materials prepared via powder metallurgy are assessed in the paper. Powder mixture was prepared by grinding of Cu and Al2O3 particles. After the compaction, materials were deformed by extrusion, forging and isostatic pressing. Qualitatively were evaluated their microstructural characteristics and quantitatively their mechanical properties. By comparison...
The advantages and disadvantages of different kinds of vibratory finishing machine tools drives: unbalanced, eccentric, and electromagnet are surveyed in this paper. The mathematical model of optimization of material capacity of a six-phase electromagnetic drive of vibratory finishing machine tools with circle oscillation trajectories of the laps is described. The theoretical results of computer simulation...
The punch and die wear of blanking dies is known to depend on the sort of material, deformation condition, thickness and shape of a part under blanking, a kind of press and die design, etc. The irregular wear of cutting edges at the face and sides of the punch and die is revealed with blanking a rectangular plate having the first or second order of difference among its dimensions. The paper considers...
This paper presents the results of comparative work efficiency tests for assembled hack-off and unback-off worm hobs. Hobs with unback-off teeth, ax compared to standard assembled hobs, provide for a 1,2-2,2 times increase in reduce durability (given equal teeth wear), relative teeth wear reduction by 1,5-1,9 times, an increase in durability between resharpenings up to 4,5 times and in number of resharpenings...
A calculation model for evaluating the limit equilibrium state of reinforced anisotropic plates with craks, subjected to tensile loading, has been formulated. The model incorporates the propsed criterional equations and a method for determining the stress intensity factors near small cracks in the reinforced plates. The model was verified on the concrete problems.
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