The authors propose the technique for optimizing the conditions for non-rigid workpieces end surfaces flat grinding that guarantees obtaining the pre-defined quality requirements of the machined ...surface (surface roughness parameter Ra, absence of grinding burns, required flatness tolerance of end surface) while ensuring the maximum process efficiency.
Mathematical models of the cutting force components, grinding ratio, and roughness of the machined surface (Ra parameter) are obtained by the full factorial experiment method. The input factors (grinding wheel hardness, depth of grinding, table feed speed and run) are considered as the grinding process optimization parameters. Mathematical models of the output factors are used to limit the range of optimization parameters allowable values. The resulted efficiency is an objective function. The optimization of parameters in the range of allowable values is carried out with the view of ensuring the maximum process efficiency.
The required flatness admission is provided at the second optimization stage of the workpieces by controlling the elastic deformation extent.
The varied parameters at controlling the maximum elastic deformation extent are cutting forces and attraction of the machine table magnetic field.
The terms for providing of the required end surface flatness tolerance are determined for workpieces taking into account elastic deformation of the non-rigid workpieces under the magnetic field effect on the machine table and the radial component of the grinding force.
Technology of Electrical Discharge Machining (EDM) uses thermal energy in material removal, in which is the electrical energy transformed, generated between the electrodes (tool and workpiece). The ...material removal occurs through the rapid periodic repetitive electrical discharges in the presence of dielectric fluid. By the action of electrical discharges occurs to decline not only particles of a metal workpiece material, but also to decline in a certain proportion of metal particles in tool electrode. The paper deals with the diagnosis the size of the electrode wear of tools made from copper and graphite used in EDM machining.
When a three-dimensional shape is machined by NC machine tool, motion errors occur around the motion direction changing points of the translational axis. This has a significant influence on a quality ...of machined surfaces. Therefore, much research on the influence of motion errors around the motion direction changing points of the feed drive system on a machined surface has been conducted to improve the quality of machined surfaces by NC machine tool. Among the motion errors that occur around the motion direction changing points of the translational axis, quadrant glitches with a stick-slip motion have a particularly large influence on the machined surface, and research on compensation methods continues to be reported. However, the transcriptional characteristics of quadrant glitches of the translational axis for machine tools have not been investigated adequately. In this study, the transcriptional characteristics of quadrant glitches of the translational axis on a machined surface were investigated. In addition, the influences of various factors on the transcriptional characteristics of quadrant glitches on a machined surface were investigated using a proposed equation and actual machining tests.
The study deals with the effect of the cutting parameters such as the cutting speed, feed and cooling on the quality of machined surfaces in the process of hole drilling for the sliding bearings used ...in agricultural technique. This effect has been studied on various metals such as copper, brass, dural and leaded bronze, which are commonly used for their friction knots of the moving parts for agricultural machinery. The results suggest the use in the design of collection parts, scything strips, as well as lifting equipment of agricultural technique, where particular linear and rotary movements of the friction parts are slow, as well as for the design of appropriate drilling procedures.
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