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Sulima I.,Pedagogical University of Cracow | Klimczyk P.,Institute of Advanced Manufacturing Technology | Malczewski P.,Pedagogical University of Cracow
Acta Metallurgica Sinica (English Letters)

The AISI316L stainless steel composites reinforced with 2, 4, 6, and 8 vol% titanium diboride (TiB2) particles were sintered by the high pressure-high temperature method. Ball-on-disk method was carried out to study wear behavior of the composites. Tests were carried out at room temperature. The TiB2particles improved the hardness and tribological properties of the composites. The friction coefficient of the composites decreased with the increasing content of TiB2. The reduction of the wear rate with the increasing of the content of TiB2particles in the steel matrix was also observed. It is demonstrated that the friction coefficient of composites with the same content of TiB2particles depend on the sintering conditions. © The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg 2014. Source

Spadlo S.,Kielce University of Technology | Kozak J.,Institute of Advanced Manufacturing Technology | Mlynarczy P.,Kielce University of Technology
Procedia CIRP

In the paper, a comprehensive study of the electro-discharge mechanical alloying with using brush electrode is presented. This kind of a novel method is denoted as BEDMA (Brush Electro-Discharge Mechanical Alloying) and it combines features of electrical discharge machining with thermo-mechanical treatment. Electrode is being made of material which is to be alloyed on the part surface. A mathematical modelling of the thermal processes and mechanical action during the interaction of a single filament on the machined surface have been developed and used to estimation of the material transfer rate. © 2013 The Authors. Source

Brostow W.,Center for Advanced Research and Technology | Czechowski K.,Institute of Advanced Manufacturing Technology | Polowski W.,Institute of Advanced Manufacturing Technology | Rusek P.,Institute of Advanced Manufacturing Technology | And 2 more authors.
Materials Research Innovations

We have performed surface modification of selected tool steels. The steels were covered with adhesive coatings of the hard chrome type or with diffusion layers of the nitride type. We have investigated in particular surface roughness, since it is known to affect friction, lubrication and wear. We have also considered an accumulation of strain energy in the strained area, which accompanies the crystal lattice deformation caused by burnishing. Surface roughness was determined by a profilometer before and after burnishing. Adhesion of coatings to steel was determined with a scratch tester. A combination of both approaches, slide burnishing with hard chrome coating and/or slide burnishing with nitriding, seems worthwhile. Both treatments and their combinations can be used in manufacturing tools and structural elements in automotive and aerospace industries. © W. S. Maney & Son Ltd. 2013. Source

Gogo J.,Institute of Advanced Manufacturing Technology
11th IMEKO TC14 Symposium on Laser Metrology for Precision Measurement and Inspection in Industry, LMPMI 2014

Thermal issues are relatively well developed and described in machine tools and their development is quite rapid in recent decades. This is related to increased awareness of the impact of thermal conditions on the accuracy and efficiency of their work and the increased requirements of users (up to 75% of the overall geometrical errors of machined workpieces can be induced by the effects of temperatures). There is a large stock of published research and case studies aimed at compensation and reduction of thermal error of machine tools. Branch of coordinate measuring machine (CMM) is strongly associated with the machine tool industry. There are a lot of convergence in approach to this theme in both subject groups. Both in the construction of machine tools and measuring machines as the key point of interest is the influence of various physical phenomena on the behavior of the executive point, in the case of measuring machines is the end of the measuring head, in the case of machine tools is a tool centre point (TCP). Considerable amount of research on the effects of thermal phenomena in the case of machine tools is carried out without taking into account the cutting forces, which also conforms research approach in both concerned areas. An important difference, however, is the fact that the compensation of thermal deformation in machine tools must be made immediately during work, if we want to improve the geometric parameters of the workpiece, which involves the introduction of some actuators, or correction of the trajectory in real time. While the result of work of the measurement machine are stored data that can be corrected or processed after the process of measuring and correction does not make any material actuator. Order of magnitude of precision in the case of machine tools and CMM is also different. Thermal phenomena associated with measuring machines are relatively well developed in the case of steady thermal state, and the uniform temperature gradient. Mathematical models are described, compensation systems have been developed. There are publications concerned with selected aspects of the measuring machine work, or selected components that generate heat inside or outside of the machine structure. However problem of modeling of the whole machine and studies of thermal effects, and timevarying or locally occurring phenomenon,based on numerical methods is relatively poorly studied. This probably results from the fact that both numerical methods and hardware have developed enough to address this issue only in recent decades. Important here is the economic aspect (the cost of computing hardware and software), and the performance parameters, which allow the calculation of the real-time close to the real-time or made in acceptable period of time post factum. Source

Skrabalak G.,Institute of Advanced Manufacturing Technology | Kozak J.,Institute of Advanced Manufacturing Technology
AIP Conference Proceedings

Paper presents mathematical modeling and practical application of Dry Electrical Discharge Milling (DEDM) process using compressed air as dielectric. A comparison of this machining method with kerosene - based EDM milling is presented. The reported results refer to the experiments on micro - machining with thick - walled electrodes. The advantages and drawbacks of this machining method, within the field of micro-machining are described and discussed. © 2011 American Institute of Physics. Source

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