In this paper, a novel approach to the definition of universal machinability is presented. The machinability model is based on analysing the vector of the cutting process performance. The machinability of C45E steel was analysed and evaluated according to the developed machinability definition. As the machinability criteria, cutting force, intensity of tool wear and surface roughness were used. Analysis of machinability was performed using different cooling and lubrication conditions: conventional flooding, minimum quantity lubrication (MQL) and high-pressure jet-assisted machining (HPJAM). Technological parameters were adjusted to the semi-finish regime, with the use of the highest parameter values possible. During the research, cutting forces, chip shapes, tool wear and surface roughness were monitored and measured. The influence of different cooling and lubrication techniques and the relationships between process performance indicators on C45E steel machinability are analysed.

Machining of engineering metallic materials on micro-level is very complicated. Micro-milling with solid tools, as one of microengineering technologies, is an acceptable process to machining of complex metallic micro-parts. The main problem in micro-milling is sensitivity of cutting tool, due its suppleness and short tool life, and its influences to workpiece accuracy and quality. In this paper is experimentally investigated tool wear of micro-milling tool. During machining tests, influence of workpiece hardness and process parameters is evaluated. Workpiece was cold work alloyed tool steel X155CrVMo12, hardened to different hardness 45, 54 and 63 HRc. Cutting tool was carbide ball-end micro-mill with TiAlN coating, and diameter of 0.6 mm. For different combination of input parameters, tool wear curves is presented, and signification of input parameters on tool wear is evaluated and discussed.

The problem of corrosion is a problem of global importance, and significant attention has been paid to this problem during last years. On the one hand, the effect of corrosion on a vehicle depends on how excessively the corrosion has spread to the structural element and, on the other hand, depends on the specific function of structural element where corrosion is found. Thus, safety of the vehicle might be significantly reduced if the corrosion spreads on the vital structural component of the vehicle. Even a small amount of corrosion that disrupts the continuity of the load bearing structure, can endanger the bearing capacity of a given structural component. A special problem from the aspect of safety is the corrosion of the vehicle frame (chassis). This paper presents an analysis of the effects of weakening of the frame due to corrosion on the predicted design bearing characteristics and safety operation parameters, which the vehicle possesses at the beginning of its service life. By reducing the dimensions of the vehicle frame due to corrosion, critical areas of the structure will ocurre, to which an additional attention should be paid during the design and control of the frame condition. The analysis was performed using the Solidworks Static Simulation program. Regarding that the occurrence of corrosion can weaken the load bearing structural elements and reduce the safety of the vehicle, it is necessary to improve the technical inspections of the vehicle and periodically check the condition of the vehicle in terms of corrosion and structural integrity.

Development of micro-devices parts is intensified with developments in medical device and energetic industry. In production of micro-parts (micro-pump, micro-gears, micro-manipulators, etc.), a wide range of engineering materials is encountered. Strict requirements are set in terms of characteristic of micro-parts machined surfaces, such are low surface roughness, advanced tribological characteristic, etc. In this paper is analysed possibilities of different metallic materials mechanical micro-machining. The analysis includes the analysis of the generating and characteristics of the machined surfaces, and influence of a whole set of parameters on surface characteristic. The results showed the benefits of mechanical micromachining and proved that it can achieve satisfactory results of the surface characteristics indicators.

Glass plays an important role in a vehicle, and it is essential to preserve the safety and security of passengers. It is called safety glass because it does not create sharp edges in the case of breaking, which can injure drivers and passengers, but scatters into many small pieces that are not dangerous (tempered glass) or remain held in place by means of an interlayer (laminated glass). During the operation of the vehicle, the glass is often damaged due to the impact of stones or other objects. The level of damage (size and character) and its location on glass determine the extent to which the safety of the use of glass is impaired. This paper presents the basic characteristics of safety glass installed in vehicles, the requirements which must fulfilled, as well as criterion for assessing its technical correctness in the technical inspection procedure. The significance of this research lies in the fact that state institutions can improve the legal regulations in the field of technical inspections of vehicles, while transportation companies can achieve appropriate financial savings in vehicle maintenance.