DD205245A1 - METHOD AND DEVICE FOR CHECKING THE SLICING MEASUREMENT - Google Patents

Abstract

Method of measuring pitch on threads with the aim of increasing the accuracy and labor productivity of the measurements. The main task is to eliminate the influence of errors of the measuring device and positional errors of the measuring object on the measurements. After the procedure, the thread of the measurement object is probed diametrically in the axial section with two probes in the flanking system. The measurement signals generated by the sensors connected to the keys are preferably fed to a computer and stored there. The pitch errors are determined from the stored measuring signals of all transducers and the measured displacement of a measuring carriage carrying the probes.

Description

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Title method and device for measuring the pitch " at threads

Field of application of the invention

The invention relates to a method and a device for pitch sameness on threads by probing the thread flank by means of pushbuttons.

Characteristic of the known technical solutions

After Berndt "The thread", Springer publishing house Berlin 1925 and the Lehrbrief for the remote study, "measuring technology and scientific bases of the exchange construction ¹¹ , No. 4 | pages 35 - 4-0, TH Dresden 1954» are measured upwards on threads optically and mechanically Probing "With these devices, multiple measurements are made on DUTs in order to eliminate misalignment of the thread. The thread is scanned diametrically in the horizontal plane by means of a pushbutton and the signals supplied by the sensor connected to the button become positional errors of the DUT by averaging Eliminated · It is disadvantageous that precise error reproducibility in the two measurements carried out independently of one another is not guaranteed by guiding errors and that the measured values to be determined

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must be obtained from two consecutive measuring operations.

Furthermore, a method for pitch mesaing is known, in which the object to be measured is touched by a probe in a horizontal plane on both thread flanks belonging to a thread gap approximately in the axial section (Lehmann "Leitfaden der Längenmeßtechnik, VEB Verlag Technik Berlin 1960, pages 438 , 439).

The disadvantage here is that center slopes and thus only half the pitch deviations are measured. Perner results in strong Verachleißersoheinungen on the measuring ball, which cause a frequent change of balls. In order to realize favorable investment conditions of the balls on the Gewindeflankeη when testing different threads, a large ball range is also required ·

Object of the invention

It is an object of the invention to eliminate the disadvantages of the prior art, to increase the accuracy and labor productivity of the measurements and to simplify the measuring process. ^;

Explanation of the essence of the invention

The object of the invention is to provide a method and a device for measuring pitch on threads, with which measurements can be carried out by special probing of the test object without the influence of errors of the measuring device and positional errors of the test object.

According to the invention, this object is achieved in a method for measuring pitch on threads in that the measurement object with two diametrically provided buttons in Achsachnitt in flanking on lying on the same plank surface of a thread tooth or gap

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Touch points is touched,,

in that the measuring signals generated by the sensors connected to the keys are preferably fed to a computer and stored there "and that the pitch errors are subsequently determined from the stored measuring signals of all the sensors and the measured displacement of a measuring carriage bearing the keys.

A device for carrying out the method with a parallel to the object displaced on a measuring device mounted, probe-carrying carrier and with transducers, which are in operative connection with the buttons, wherein the carrier is mounted in a rotatable mounting in a measuring object measurably displaceable Meßschlitten exists in that

on the support (1) two perpendicular to the axis (4) of the test object (5) arranged and in the radial direction to the test object (5) displaceable and adjustable push-buttons (6; 7) are provided which in the measuring position diametrically on a rectified thread flank (12; 12 ") of a thread tooth or a gap abut and which are in operative connection with transducers (15; 16), wherein at least one of the buttons (6; 7) is additionally slidably and clampably mounted parallel to the axis (4) of the test object (5) .

in that a deflection measuring device, consisting of an adjustable support (19) and a measuring probe (20) with a transmitter (21) operated by it, is also arranged on the support (1),

in that the outputs of all transducers (15; 16; 21) are connected to a computer (22) or an evaluation device

and that the computer (22) or the evaluation device is followed by an output unit (23) for displaying or outputting the determined and corrected pitch errors «3945

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Thus, the method and the device are based on two probes being arranged diametrically so that the points of contact of the probes lie in the axial section on the same plank surface belonging to a thread tooth or gap. It is advantageous to provide the points of contact such that the deflection of the probe due to geometric device error or pitch error takes place in a horizontal plane. The provided deflection measuring device makes it possible to take into account influences of the deflection, in particular when testing long measuring objects, and thereby to avoid conditional measurement errors.

The advantage of the invention lies in the fact that the pitch errors can be determined by definition in flanking the probe and free of influences from leadership inaccuracies of the meter and deflections of the test object with low measurement times and high accuracy ·

embodiment

The invention will be explained in more detail with reference to a schematic drawing.

The device for performing slope measurements comprises a carrier 1, which is mounted in a rotatable mounting 2 on a measuring slide 3 and is arranged perpendicular to the axis 4 of a test object 5 to be tested. This measuring carriage 3 is displaced by a drive device, not shown, according to the slope of the measurement object 5 parallel to the axis 4 of the measurement object measurably. Arn carrier 1 are two perpendicular to the axis 4 arranged buttons 6 and 7, which are displaceable and adjustable in the radial direction to the measuring object 5 in bearings 8 and 9 along the carrier 1 and can be locked in any position. The direction of displacement is indicated by arrows 10 and 11.

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During the measurement, the probes 6 and 7 in the bearings 8 and 9 are displaced so far in the direction of the object to be measured 5 that they touch a thread flank 12, 12 "diametrically approximately Xn plank center and in the axial section of the measuring subject and into the Bearings 8 and S are to be clamped · In the case of geometric deviations of the thread, the deflection of the pushbuttons 6 and 7 takes place in the axial direction of the test object 5 (arrows 13, 14). These deflections of the pushbuttons 6 and 7 are detected by transducers 15 and 16 with which the Button 6 and 7 in operative connection ", converted into electrical measuring signals.

Since there is between the diametrically located points of contact of the push button 6 and 7 to the rectified Plank surfaces of Gewindeflankeη 12 _f 12 * a path difference of at least half a thread pitch P is at least one sensor 7 in addition to guides 17, 18 parallel to the axis 4 of the measurement object 5 adjustable - and clampable ·

For measurements of long DUTs 5 »such. Deflections which are likely to falsify the measuring result are expected · A rigid guidance of the carrier 1 and with it the push-buttons 6 and 7 in the bearing 2 would cause the contact points of the push-buttons 6 and 7 on the thread flanks 12, 12 « It is therefore on the support 1, an arrangement consisting of an adjustable support 19 and an actuated by them probe 20 with Meßduedgeber 21, arranged on the support 1 , The support 19 ensures that the two buttons 6,7 always touch the object to be measured 5 in the axial section · By the probe 20 and the transmitter 21, the deflection of the test object 5 characteristic measurements are generated, aas those in a computer 22 on the deflection Eliminating retrogressive errors. 3945

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The outputs of the measuring values 15, 16, 21 are connected to the computer 22 or to an evaluation device. These measured values or electrical measuring signals are tapped or demanded by the computer 22. By means of averaging and / or subtraction from the measurement signals of the transducers 15 and 16 and the measured coordinates of the measuring slide 3, geometrical errors of the measuring device, such as guide errors and positional errors of the thread to be tested, are eliminated in the computer 22. At the same time, the measuring signal of the transmitter 21 is sent to the computer 22 supplied and taken into account in determining the pitch error mathematically the influence of the deflection, so that at a, the computer 22 nachgöordneten output unit 23, the corrected measurement result is displayed or output · '

£ 1 JUN 1982 * 016428

Claims (2)

237787 7 Erfindungaanspruoh 1 »Method for ascending the pitch on threads, whereby the threaded object to be measured is touched in a gap or on a threaded tooth in the axle son and by a transmitter. supplied measuring signals are evaluated to determine the slope error, characterized - That the DUT is touched with two diametrically provided buttons in the axial section in flanking system lying on the same plank surface of a thread tooth or gap points of contact, - That the measurement signals generated by the, connected to the sensors probes, preferably fed to a computer and stored there, - And that subsequently from the stored measuring signals of all transducers and the measured displacement of the jüüaster carrying measuring slide the pitch errors are determined · 2. Device for carrying out the method according to item 1, with a parallel to the object displaced mounted on a measuring device, probe carrying carrier and with transducers, which are in operative connection with the buttons, wherein the carrier in a rotatable mounting in a measurable displaceable to the object to be measured Measuring slide is mounted, characterized - That on the support (1) two perpendicular to the axis (4) of the measurement object (5) arranged and in the radial direction to the test object (5) displaceable and adjustable push-buttons (6; 7) are provided, which in the measuring position diametrically to a rectified 3945 16Μ1982 * Ι) 1β428 237787 7 At least one of the buttons (6, 7) additionally displaceable parallel to the axis (4) of the test object (5) and is clamped, - that further on the carrier (1) a deflection measuring device, consisting of an adjustable support (19) and an actuated by them probe (20) with transmitter (21) is arranged, - That the outputs of all transducers (15; 16; 21) are connected to a computer (22) or an evaluation device and that the computer (22) or the evaluation device is followed by an output unit (23) for displaying or outputting the determined and corrected pitch errors « i & Jllll 1982 * 016428