The hardness tester for dry molds and rods model 04421 is designed to measure the hardness surfaces of dry molds and rods at the molding and rod sections of foundries, in shop and factory laboratories of molding materials and in research organizations.
Components of the device and the principle of operation
This device consists of a housing that is designed to assemble all the parts. An indicator is attached to the top of the case, which records the readings. The indenter, and then the support surface of the sleeve is brought into contact with the test surface of the mold or rod. In this case, the indenter moves relative to the body by an amount determined by the hardness of the surface under study. With the help of a lever, the movement of the indenter is transmitted to the indicator rod in a given ratio (1:2.5). As a result, the arrow turns. After removing the hardness tester from the test surface, the spring returns the indenter to the initial position, while the hardness tester fixes the obtained hardness value. The movement of the indenter by 2.5 mm corresponds to the rotation of the arrow by 360. The indenter insertion force is provided by a spring. The readings are reset by pressing the reset button on the indicator. Before starting the measurement, it is necessary to rotate the upper ring of the indicator associated with the scale to align the arrow with the zero mark of the scale.