Propozycja modyfikacji metody miseczkowania AEG oceny tłoczności blach

Abstract

The limiting drawing ratio is determined in the Swift deep drawing cup test or the AEG cupping method. However, the results obtained with the two methods may differ significantly. The total number of three measurement points (blank diameters) in the AEG method is insufficient. The paper proposes a modification of this method by using a larger number of measuring points, both for the maximum drawing force and the fracture force. Other, than linear, types of approximation functions were also analyzed (power, exponential function). With a greater number of points, the curvilinear character of the change in the maximum value of the drawing force as a function of the drawing ratio K1 was found, as well as the decrease in the fracture force value with the increase of the blank diameter. It was found that for the determination of the limiting drawing ratio by the modified AEG cupping method, the optimum is the description of the maximum force variation with a power function based on three representative measurement points, and the fracture force with a linear function based on at least two points. This made it possible to obtain results comparable to those obtained with the Swift cup test.