Method and apparatus for testing the hardness of a workpiece by

Details Method and apparatus for testing the hardness of a workpiece by Method and apparatus for testing the hardness of a workpiece by

1991-06-12

1993-03-23

Williams, Hezron E.

Measuring and testing

Hardness

By penetrator or indentor

73 82, G01N 342

Patent

active

051953641

ABSTRACT:
A method of testing the hardness of a workpiece having a continuously curved outer surface, in particular a pipe or rod, by the penetration method, includes (a) holding the workpiece in a horizontally and vertically fixed position; (b) arranging a machine tool and a hardness testing instrument having a penetration body above the workpiece for movement with respect to the workpiece; (c) linearly scanning a predetermined area of the curved surface of the workpiece for determining the distance between a distance sensor and the curved surface, the region lying in the horizontal path of the machine tool; (d) determining the summit point of the scanned curved surface area from the scanning operation of step (c); (e) selecting the scanned curved area as the test location for the horizontal positioning of the hardness testing instrument; (f) selecting a locus along the scanned curved area of the workpiece as the reference point for the vertical positioning of the machining tool; (g) machining a region into the surface of the workpiece; (f) pressing the penetration body with a defined force into the machined region to generate an impression surface into the machined region of the workpiece; and (i) determining the hardness of the workpiece from the surface of the depression. An apparatus for performing the method is also disclosed.

REFERENCES:
patent: 3295363 (1967-01-01), Delporte
patent: 3822946 (1974-07-01), Rynkowski
patent: 4635471 (1987-01-01), Rogers et al.
patent: 4719793 (1988-01-01), Pozo
patent: 4852397 (1989-08-01), Haggag
Abstract of Japanese Patent JP 60-143739.

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