Vliv vodivosti dielektrika na vybrané parametry integrity povrchu u technologie elektroerozivního drátového řezání

Abstract

The dissertation deals with the issue of specific electrical conductivity of the process medium of wire cutting technology. The process fluid of WEDM dielectric technology plays an important role in the process efficiency and stability of this technology. The main objective of this dissertation is to determine the behavior of WEDM at different settings of the specific electrical conductivity value of the aqueous dielectric with possible application in practice. In the introductory part, a survey of the state of the art is presented. The technology itself as well as other dielectrics used are described, with already performed researches close to this issue mentioned. This is followed by a characterization of the surface integrity parameters, their measurement methods and evaluation. In the experimental work, all the devices on which the dissertation was carried out are described with the methodology of the experiment and with the recorded data acquisition process. For the purpose of the experiment, the material used was EN ISO 42CrMo4, which is widely used in practice due to its characteristic properties. In order to ensure the reliability of the experiment, the blank was processed according to the methodological procedure that I determined from the rough blank from the billet to the actual fabrication of the samples. Furthermore, the measurement system techniques for recording the specific electrical conductivity and motion sensing of the WEDM were designed and built in this work. The device on which the main part of the experiment was carried out was a WEDM CHMER G32F. The specific electrical conductivity measurements were both monitored on the WEDM and recorded using equipment from JUMO. The measurement of the cutting speed was carried out using Linear Displacement motion sensors. Surface integrity parameters were measured by optical method on Alicona equipment to determine surface roughness, SMS Wenzel to determine GPS parameters and SEM QANTA FEG 450 electron microscope to analyze surface structure. The measured data were evaluated, and the results were determined. The measurement results were used to identify further research subjects and contributions to the field of science and practice.