US 5,959,198 AGranted

Method and device for testing the hardness of workpieces and device for carrying out this process

OwnerHeinz-Horst Pollok, Andreas Wieseinventors

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Abstract

The invention concerns a method of testing the hardness of workpieces (22), wherein an impact body (20) is moved onto the workpiece (22) to be tested such that it impinges thereon (along a forward path) and rebounds thereof (along a return path). On both the return and the forward paths, a movement value of the impact body (20) is detected by a contactlessly operating device and a measure of the hardness of the workpiece (22) is obtained from the difference between the forward and return path movement values. The movement value is detected at at least two points on the forward path and at at least two points on the return path. Corresponding to each movement value detection point on the forward path is a point on the return path at a substantially similar distance from the point of impact.

Claims9

Dependent claims

A procedure for a hardness test of workpieces, in which an impact object is moved along a forward path into the workpiece to be tested in such a way, that the impact object strikes the workpiece, then rebounds off it and moves on a rearward path away from the workpiece;

whereby the respective velocities of the forward path and the rearward path of the impact object are recorded by means of a nonintervening measuring device;
whereby a measurement of the hardness of the workpiece is established by comparing the difference of the motion of the forward path and that of the rearward path;
characterized by the fact that the velocities of motion are recorded on at least two locations of the forward path and on at least two locations of the rearward path, such that forces of gravity are taken into account at the time of measurement, and that each location of the forward path where the velocity of motion is recorded corresponds to a location of the rearward path.

Dependencies are inferred from the claim text.