Process for the determination of the position and/or dimensions of an object to be tested, and device for carrying it out.

The invention relates to a method for determining the position and dimensions of a test object according to the preamble of claim 1.

From the European patent application 0029499 a device for determining dimensions of a test object by means of a relatively movable to this switching button and at least one measuring device for detecting the relative position between the test object and the circuit switch is known in which the switching button at the time of contact with the test object generates a signal for retaining the present at that time measured value of the measuring device.

The probing of the test object by the switching button is performed with different preset speeds. It has been shown that the values ​​determined by the measuring device measured values ​​for the relative position between the UUT and the shift key while probing contain errors by deformations of the Switching probe and the test object at the common contact point. These deformations are again dependent on the probing and the other of the material pairing between the switch button and the UUT.

The invention is based, to eliminate such velocity and material-dependent measurement error in a method for determining the position and dimensions of a test object, the object.

This object is achieved by the characterizing measures of claim 1.

The advantages achieved with the invention consist, in particular, that can be carried out by the previously determined correction values ​​in a simple way, fast and accurate correction of erroneous values, so that regardless of the probing and material pairing between the switch button and the UUT an accurate determination of location and dimensions of the test object and thus a highly efficient use of the device are made possible.

Advantageous developments of the invention are set forth to the dependent claims.

An embodiment of the invention will be described with reference to the drawing.

Show it<ul><li>Figure 1 is a Dreikoordinatenmeßmaschine,</li><li>2 shows a diagram of the displacement of the switching point of the switch button in response to the probing speed, and</li><li>3 shows a device for carrying out the method.</li></ul>

1 shows a Dreikoordinatenmeßmaschine is illustrated with a table T for receiving a test object P, which is slidable on a machine stand B in three orthogonal machine axes. To measure the displacement of the table T to the UUT P in the X direction (to be considered here alone) is provided a length-L at the Dreikoordinatenmeßmaschine. For probing surfaces F₁, F₂ the specimen P is secured a acting in the three machine axes switch button S on the machine column B.

To determine the position and / or external measurements of the test object P in the X direction to the surface to be groping F of the table is T.mit-the thereon UUT P moved in the X direction with a certain predetermined speed,₁ the test object P contacted with the probe ball K of locking pushbutton S; the displacement of the table T, and thus the test object P is measured by the length measuring L. At the time of contact between the surface to be probed F₁ the test object P and the probe tip K of the locking pushbutton S is the switching button S a signal for retaining the present at this time in the length measuring L measured value for the relative position between the Prüfofjekt P and the switching button S. Subsequently, in the same manner, the surface of the opposite face F F₂ the test object P touched by switching button S; the position and outer dimension of the test object P is then determined in the X direction from the two measured values ​​obtained.

For probing of the test object P, the table T is displaceable via a spindle SP by means of a drive unit AT which is acted upon by a numerical control device ST via a digital / analog converter D and a drive controller AR according to FIG. 3 The length measuring L for measuring the displacement of the test object P with respect to the locking pushbutton S is connected to an up / down counter Z for counting the measurement pulses generated by the length measuring L correct sign. The switch button S indicates the up / down counter Z and to the controller ST at the time of contact between the surfaces to be probed F₁, F₂ the test object P and the probe ball K signal a from which the up / down counter Z detention and transfer of the present measured value to an adder AD and the control ST stopping the relative movement between the switch button S and the UUT P causes.

2 shows a diagram of the displacement s of the switching point of the switching key S as a function of the probing speed is v shown at a particular combination of materials as a result of deformations between the probe tip K of the shift key S and the test object P at the common contact point.

According to the invention, this switching point shifts s as previously determined correction values ​​as a function of the probing speed v in the form of a correction table in digital form in a memory M₁ stored, is connected to the adder AD and the control device ST. The previously determined correction values ​​for the different material pairings are in digital form in a memory M₂ stored, which is also connected to the adder AD and to an input unit E; by means of the input unit E of the in memory M₂ selected stored correction values, the correction value corresponding to the present combination of materials and provided to the adder AD available. The controller ST selects a result of probing given her the relevant correction value in the memory M₁ and provides it to the adder AD is available.

The result of the votes from the locking pushbutton S during the contact signal transmitted to the adder AD measured value is applied to the correction values ​​for the probing and material combination in question; the corrected measured value is stored in a memory M₃ stored and can then be brought by the control device ST in a display unit A for display. From the two corrected measured values ​​during the scanning of the surfaces F "F₂ the position and outer dimension of the test object P is obtained in X-direction.

The adder AD may be formed in a manner not shown by a present in the control device ST computer, by a further processing of the memory M₃ can be carried stored corrected measured values.

The correction values ​​can be determined in advance depending on the respective discrete variable contact speeds or each associated with specific areas of contact speeds.

Among material pairing, the material properties of the probe tip K of the shift key S and the test object to be probed P for hardness, that is their resistance to mechanical deformation at the common junction understood when probing.