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The purpose of this paper is to evaluate the usability of 70/30 Ni-Al coatings sprayed onto steel 45 base. The microstructure, elementary composition, wear resistance with cast iron, microhardness and adhesion in the shearing test were examinated.
Test results of X-ray influence on mechanical features and electrical properties of some aged aluminium alloy types AlSi20CuNiMg, AlMg1Si1Mn, AlMg5. A significant influence of roentgenizing on those materials was observed and measured by means of such parameters as hardness, extensibility Rm, elongation A5, electrical resistivity; also its influence on exoemission phenomena and on pictures of rentgenograms...
The paper presents theoretical analysis of the phenomena conditioning recycling of metal cast-matrix composites, considered as separation of reinforcement and metal of matrix. In the case of composites reinforced with particles the phenomena related to sedimentation of reinforcement particles and their extraction with slag and neutral gas have been analysed. On the other hand, in case of saturated...
The paper presents a model of piston pneumatic unit and analyses the dynamic process taking place in the appliance generating periodic sygnals. Nonlinearities and feedback occuring in flow and vibration process are described. A method of nonlinearity and feedback compensation by input parameters of air streams is presented.
Problems of thermal loads, cavitation erosion, wear and coking of injectors used in marine diesel engines are presented. Relationships taking place in the fuel valve operation are explained and their effect on injector wear is discussed.
The paper presents the results of verification of an FWD-32J milling machine model identified on the basis of six experimentaly determined amplitude - frequency characteristics of the machine worktable. This verification was carried out in three different ways. In the firs stage the Cramer-Rao inequality was used while the next stages involved a comparison made between the frequency characteristics...
The paper includes the results of exploitation reliability investigations of the impeller pumps installed on some ships of Polish Steamship Company, Szczecin. On their basis elements of durability distribution functions of the pumps working in usual exploinations were determined. The obtained results can be useful for both manufactures and users of the pumps.
The paper specifies the sorts of the body oscillations carrying the load in tribological kinematic pair of machines with the piston-connecting rod mechanism and the magnitudes influencing these oscillations. It describes the mechanism of creation in tribological kinematic pair the additional dynamical forces. The courses of gas and body resultant forces influencing the particular kinematic pair of...
This paper concerns gearing with undercut at tooth root, generated by tools with protuberance. An influence of selected important geometrical parameters of tool and machined gear on parameters of the critical section, radius of tooth active profile at tooth root on maximal stresses in the critical section was investigated. Analyzed geometrical parameters of tooth root (paremeters of the critical section...
The basic idea that the frictional force between sliding surfaces is dominated by mechanical interactions is supported by the experimental results presented in this paper. The work accomplished by friction in the grinding process assuming stable state is the main factor of the energetic balance. The quantitative contribution of the work of friction is dependent on the tribological characteristics...
The paper shows some results of an analysis of the grinding wheel cutting surface (GWCS) to enable the choice of parameters describing the state of GWCS. These parameters will be further used to create a model of GWCS microstereometry and a model of its functional properties. Both models will next be elaborated using artificial neural networks. Research works was carried out on the basis of profile...
Indutrial Manufacturing has an important role as our main motor of welfare. Productivity and quality is required in order to succeed. To extend our possibilities to contribute to Wealth, Prosperity and Peace through Productivity in Manufacturing we need to focus on Innovative Competence, ability to define customer oriented targets and ability to make correct decision together with ability tu understand,...
Hybrid machining combines two and more processes for shaping and/or finishing machine parts, tools, electronics devices and micro parts. These hybrid processes are developed to enhance advantages and to minimize potential disadvantages associated with an industrial technique. This paper presents the constituents of main hybrid processes, description of their characteristics and physico-chemical interaction...
Surface geometrical structure of the workpiece is the result of an interaction of a cutting process and the machine-tool dynamical structure, generating during the turning process. In this paper we simulated the influence of the tool relative displacement between the tool and the workpiece changes the hight of the roughness within each revolution and, for a longer surface section the envelope of the...
The number and the location of points of polymer feeding to an injection mould cavity effect the process of cavity filling and the quality of mouldings. Experiments were made on test specimens received by mean of an injection mould with interchangeable cavity plates. Special inserts in a cavity plate allowed its filling through one or two gates. Experiments carried out for two types of high density...
The work discusses procedures and differences in the results of parametric multiobjective optimization for the cases of treating the quantities occurring in objective functions and constraints as deterministic or probabilistic ones. Contains a review and recapitulation of selected works that take into account the scatter of tool life in optimizing cutting parameters, and presents mathematical models...
Hybrid machining combines two or more processes for shaping and/or finishing machine parts, tools, electronic devices and micro parts. These hybrid processes are developed on enhance advantages and to minimize potential disadvantages associated with an individual technique. This paper presents the constituents of main abrasive hybrid processes, description of their characteristics and physicochemical...
In feed systems drive of movements of numerically controlled machine tools (NC machine tools) usually direct current rotary electric motors (DC-servo) and brushless rotary motors (AC-servo) are employed and besides it can be observed that synchronous linear motors are used for this purpose. Drives with rotary and linear motors differ from each other with respect to kinematics and dynamics. The aim...
Structural stability of metal cutting process was discussed. The impossibility of exact mathematical model of cutting process elaboration using linear dynamic was proved. A way of measuring signals processing for complex multi pick-up system of cutting process monitoring was presented.
In this paper the structure and the ability to protect the castings made from GX25NiCrSi36-17 cast steel against carburization with the use of the coatings produced directly in a casting mould have been described. To analyse the structure the following methods of testing were used: an optical and electron microscopy, X-ray microanalysis, X-ray diffraction and quantative image analysis. It can be stated...
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