COMPARATIVE ANALYSIS OF TWO METHODS OF ELECTROEROSION FIRMWARE FOR DEAF MICROHOLES

Abstract

The paper presents the results of experimental studies of the significance of differences in the technological parameters of electroerosive micro-hole firmware for two variants of the micro-hole firmware series process: without facing the tool electrode and with the tool electrode facing after processing each hole. The significance of differences in the technological parameters of the firmware process is established: by the wear of the electrode-tool, by the productivity of the process and the efficiency of the process as a whole. Detailed statistical processing of data from two samples of eight duplicate (parallel) experiments in each sample is performed to accurately assess the significance of the differences between the two variants of the process of electroerosive firmware of microholes. Calculations are made of the limit values of parameters of the microholes' electroerosion firmware: the relative linear wear of the electrode-tool and the process performance. They allow identifying and excluding doubtful experiments (artifacts) from the results, i.e. experiments with sharply distinguished results. The results of such experiments should be excluded from the statistical series, since they significantly affect the results of the experiment. The paper uses an exact method for determining the required number of duplicate experiments developed at BSTU named after V. G. Shukhov. The conducted research clearly shows the feasibility of introducing the electrode-tool in manufacturing to reduce the wear of the electrode-tool and, therefore, increase the quality of products with deaf microholes, for example, in the mass production of atraumatic surgical needles, the volume of production of which is millions of pieces per year.