1982 Volume 48 Issue 12 Pages 1578-1583
This report is concerned with the automated method for measuring Brinell hardness, which is intended for measuring accurately, automatically, and rapidly a diameter of indentation formed on a specimen. The features of the measuring system of this noncontact type, such a simple mechanism, a short measuring time and a high accuracy, are composed of a laser equipment and a microcomputer. The principle of automatic measurement is described, and a personal error and a deviation of the resulting Brinell hardness measured with this system is also discussed comparing with those obtained by a usual method using a measuring micro scope. As the present automated system using the microcomputer can detect the center of the indentation much easilier compared with the conventional measuring microscope method, the diameters in two directions are obtainable accurately. Comparing to the conventional system, therefore, a reduction in the complexity in the calculating of the Brinell hardness value and the personal error are available. Further, it is shown that this automated method using the microcomputer and the laser equipment attained an improvement of accuracy, stability and measuring time compared with the usual method using the measuring microscope.
