Real time compensation as applied to conventional EDM milling requires discrimination of the individual discharges. Due to the very short discharge duration, real time discharge discrimination and calculation of discharge energy is not practical in micro EDM milling. This paper investigates the applicability of real time wear compensation in micro EDM milling based on discharge counting and discharge population characterization. Experiments were performed involving discharge counting and tool electrode wear measurement in a wide range of process parameters settings involving different current pulse shapes. A strong correlation is found between average discharge energy of the populations and wear and material removal per discharge. A validation was carried out showing the feasibility of the proposed approach.
COBISS.SI-ID: 11959579
In this paper we describe the development and application of an intelligent measuring control system with integrated robot vision, to enable the solving of complex assembly and quality control tasks with high accuracy and speed. The existing quality-control procedure for welded rings involves a visual observation of the inner surface of the welded ring and the use of calipers. As explained in Section Determination of the control goals, this leads to limitation of the ring accuracy and the ability to detect faults. To overcome these limitations we have developed a noncontact control method implemented inthe machine-vision system. The development and application of machine-visionis a multifold problem. It requires a great amount of expert knowledge, experience and innovation. We present a machine-vision system consisting of a mathematical algorithm developed for accurate measurement of the diameter and roundness of welded rings, to be used along with physical measurements. The principle of the measuring method and the required equipment are given in Section Main idea of the measurement. Section Theoretical description of the algorithm contains themathematical formulation implemented in a computer algorithm for the measured parameters. Section Algorithm verification and the necessary corrections describes analytical experiments conducted to verify the accuracy of the algorithm and derive necessary corrections. Three systems with different range of quality and accuracy are compared and discussed at the end of the paper. The developed machine-vision measuring system was successfully implemented in industrial application, thus eliminating human subjectivity.
COBISS.SI-ID: 11512091
The paper presents a modern manufacturing concept called the backward incremental hole-flanging process. It enables drawing necks on the final products that can be very complex or even closed with minimal expense. Special attention is dedicated to researching the most influential process parameters affecting the neck height and the thinning of the neck using empirical modelling. Results show that forming tool diameter, and horizontal and vertical step sizes have the greatest influence on the forming results.
COBISS.SI-ID: 11805979