Measuring and testing – Hardness – Scleroscope or rebound
Patent
1998-01-12
1999-09-28
Noori, Max H.
Measuring and testing
Hardness
Scleroscope or rebound
73 1206, 73 1209, G01N 330
Patent
active
059591986
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a procedure for a hardness test of workpieces, with which an impact object is moved onto the workpiece to be tested in such a way, that it strikes onto the same (on the forward path) and (on the backward path) rebounds again off it, whereby on the forward path and on the backward path a quantity of motion of the impact object is recorded each by means of a device working without contact and a measurement is received for the hardness of the workpiece by the difference of the quantity of motion of the forward path and that of the backward path and a device for the operation of this procedure.
From the procedure of the above mentioned kind known from the DE 24 52 880 C2 as well as from the devices working according to these procedures, the impact object is connected to a permanent magnet, which can be moved via an induction coil, which itself is connected to a tubular case, within which the impact object is movable. In the known procedure the quantities of motion are recorded directly before the impact and directly after the rebound. In the practical application, however, it is necessary to keep a certain distance from the location of the impact, a measurement of the quantities of motion directly at the time of impact cannot be performed. For the evaluation it is necessary, however to extrapolate to the time of impact or the location of impact. The closer the measurement is performed at the location of impact, the easier it is.
The further the quantities of motion are recorded from the location of impact, however, the bigger the influence of other parameters, especially that of the forces of gravity. It is evident that with the known equipment of the above mentioned kind, the distance between the location of impact and the location, at which the quantity of motion is measured, is so relevant already that the forces of gravity have an importance which should not be neglected. The kinds of equipment already on the market mentioned above are equipped with correction charts for their orientation. These charts exist either in printed form or they are stored in the equipment and have to be read or selected at the time of evaluation. So it is especially important, whether the impact object is moved from below, against the forces of gravity, towards the workpiece and falls back under the influence of the forces of gravity or vice versa, whether the forces of gravity accelerate the impact object on the forward path and reduce the speed by braking on the backward path, meaning that the equipment is mounted upon the workpiece to be tested from above.
The correction procedure according to the state of the art make the use of the known equipment circumstantial, they make the application much harder for the user. Furthermore the correction procedures are also a reason for incorrect measurements, because the corrections are not taken into account correctly, because, for example, the actual angle between the equipment and the vertical line is met in the wrong way.
This is where the invention sets in. It is the task of the invention to further develop the procedure of the above mentioned kind and the equipment for the hardness test working according to this procedure in such a way, that the forces of gravity are already taken into account at the time of measurement, and that correction charts can be avoided in such a way.
This task is solved according to the procedure of the above mentioned kind in such a way that the quantity of motion is recorded at two locations of the forward path at least and at two locations of the backward path at least and that each location of the forward path, where the quantity of motion is recorded, corresponds to a location of the backward path each with the same distance of the impact location, if possible.
This task is solved by an equipment for a hardness test according to patent claim 6 with regard to the device.
Unlike to the procedure and the respective equipment according to the state of the art, the invention does not aim to record the quantity of motions in the p
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patent: 5457984 (1995-10-01), Ambur et al.
Pollok Heinz-Horst
Wiese Andreas
Cornaby K. S.
Noori Max H.
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