Electrical Discharge Machining (EDM) is one of progressively developing machining technology. Its advantage over other progressive machining technologies is the high achieved accuracy of the machined surface. Moreover, in this case, it is machining without force, which means that the mechanical properties of the material to be machined do not impose almost any limits. However, during EDM, the material is not only removed from the workpiece, but also from the tool electrode, causing wear. However, a number of factors have an impact on the Tool Wear Rate (TWR) during the electrical discharge process. It is mainly its chemical and physical properties, the type of material being machined, but also its geometric shape. Therefore, based on the experimental measurements performed, the aim of the paper was to identify the influence of the geometric shape of the graphite tool electrode on the TWR and MRR size during EDM of tool steel EN 90MnCrV8. On the basis of the obtained results, set recommendations for the correct choice of the geometric shape of graphite tool electrodes used in EDM tool steels.
The article describes modifications to the effector of a manipulator arm proposed in order to increase the accuracy of jaw force measurements. Gripping force measurement is performed using strain gauges. Their proper positioning and connection minimize not only the influence of the position of the centre of gravity of the manipulation object on the jaws but also the effect of temperature changes around the measuring area. The possibility of altering the magnitude of gripping force was incorporated into the robot control application. This greatly increases the security of handling and increases the number of items that can be possibly gripped. Modified effector parts were subjected to stress analysis, with emphasis on the elimination of stress peaks that would not occur in real parts. The article also describes the design of the mechanical modification of the effector, which would allow the continuous rotation of the jaws of the effector.
Nowadays, due to the requirement to achieve specific product properties or to reduce the weight of machine parts, conventional metal materials are replaced by plastics. Various methods are used to connect them to assemblies. The task of the joint is to provide a perfect, but particularly reliable, compact unit. One of the relatively effective methods of bonding plastic parts is their bonding. In addition to the properties of the adhesive used, the quality and reliability of the bonded plastic components also depend on the properties of the plastic materials used. The aim of the experimental research was therefore to contribute to the knowledge in the field of strength properties of bonded joints using PA6 and PBT plastic materials with different amount (wt%) of recycled polymer.KEYWORDS bonded joints, recycled plastic, polyamide 6 (PA6), polybutylene terephthalate (PBT), shear strength, testing.[STN EN 28510-1] Adhesives. Testing the peeling of the test specimen joint from a flexible and rigid adherend.[ISO 9664:1993] Adhesives. Test methods for fatigue properties of structural adhesives in tensile shear. CONTACTSIng. Gabriel Dittrich; assoc. prof. Ľuboslav Straka, PhD.; Ing. František Botko, PhD.; Ing. Ján Duplák, PhD.; Ing. Jarosalv Birčák;
WEDM technology is among the final technology. It is characterized by the high quality of the machined surface. Therefore, a small geometric deviation from the desired shape, position, orientation or run out may have a significant impact on the functionality of the finished component. Its range is largely influenced by the accuracy of the applied electroerosion device, the precision of the workpiece and tool setting, the machining method, but also the combination of each other and the adjustment of all process parameters. They result in the final quality of the machined surface not only in terms of roughness parameters but also in terms of geometric precision of the machined surface. The aim of the paper was to describe the possibilities of improving the geometrical accuracy of WEDM with thin brass electrodes. At the same time, it contributes to an existing database of knowledge that defines the influence of selected aspects on the geometrical accuracy of the machined area in the production of circular openings.
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