SU1231392A1 - Method of testing electromagnetic thickness gauges for non-magnetic coats on electroconducting base - Google Patents

Abstract

The invention relates to the field of measurement technology and can be used in various areas of mechanical engineering for the calibration of coating thickness gauges. The purpose of the invention is to improve the accuracy of verification by setting the origin to a relatively well-known thickness of the nonmagnetic plate — Hbi, which performs the function of a gap. The method of verification of electro-magnetic thickness gauges I of non-magnetic coatings on an electrically conductive base is called to the fact that the geometry of the wedge-shaped plate (length and slope tgoi) is chosen so as to ensure that the thickness gauge is calibrated in the required range. A thickness gauge transducer with a spring-loaded sensing element is placed on a sample of base material mounted on a wedge-shaped plate. A plate of known thickness from a non-magnetic material is placed on the surface of the sample, the scale of the thickness gauge with a known value of the thickness of the non-magnetic plate is adjusted, the last AND is displaced to the wedge plate until the scale of the thickness gauge matches the thickness of the plate of non-magnetic material. Then, by moving the wedge plate, the gap between the transducer and the sample is changed, and the gap value is compared with the indications of the togacinomer scale. 1 il. (L with you with 00 with to

Description

The invention relates to a measurement technique, in particular to the metrological assurance of electromagnetic devices measuring the thickness of coatings, and can be applied in various fields of mechanical engineering.

The purpose of the invention is to increase the accuracy of verification.

The drawing shows a scheme for implementing a method for calibrating electromagnetic thickness gauges of nonmagnetic coatings on an electrically conductive base.

The diagram shows a wedge-shaped plate 1, the inclination of the working surface relative to the base is characterized by tpei, sample 2 of the base material, the slope of the lower surface equal to the inclination of the working surface of the wedge-shaped plate 1, micrometer screw 3 with a reference scale designed to precisely move the wedge-shaped plate 1 in horizontal the direction of the plate 4 of a known thickness of a non-magnetic material, the transducer 5 of an electromagnetic thickness gauge with a spring-loaded sensitive element and 6 is parallel to measure length for moving the plate 1 by an amount greater than the measurement range of the reference 3, the micrometer scale.

The method of calibration of electromagnetic thickness gauges of non-magnetic coatings on an electrically conductive base is carried out in the following way.

Choose the geometry of the wedge-shaped plate 1 (the length and slope of the tpc) in such a way as to ensure the verification of the electromagnetic thickness gauge in the required range.

A plate 4 of a known thickness of non-magnetic material is placed on the surface of sample 2. On the plate 4 install the Converter 5 thickness gauge coatings. By adjusting the thickness gauge, its readings are exactly matched to the thickness of the plate 4. This is the indication of the thickness gauge fixed. Then the plate 4 is removed. rotating the micrometer screw 3, move the wedge-shaped plate 1 in the horizontal direction, which ensures the movement of the sample 2 in the vertical direction. As a result, an air gap h is formed between the transducer 5 and sample 2.

The rotation of the micrometer screw 3 is carried out until the reading of the thickness gauge corresponds to its fixed reading. The size of the gap between the transducer 5 and the sample 2 corresponds to the thickness of the plate 4 of a nonmagnetic material. In this position, fix the initial reading tj, the reference scale micrometric viit 3. This sets

the origin, thickness gauge and the relationship between its readings and the reading scale of the micrometer screw 3. Taking into account the geometry of the wedge 1, the readings of the reading scale of the micrometer screw 3, corresponding to the minimum H and the largest h, are determined. the gaps between the transducer 5 and sample 2 in the corresponding range. the area of the gauge thickness gauge.

Readout of reference scale - micrometric screw 3, depending on the gap h. between the transducer 5 and sample 2 is defined as deviations from the readout reading

the scale fj, with an initial gap h equal to the thickness of the plate 4,

P „e ,, b, -n,.

C

When the movement of the wedge 1, depending on the gap hi. with respect to the initial gap h exceeds the value of mm, where A is the limit of measurement

neither the micrometer screw 3 scale, the wedge-shaped plate 1 and the micrometer screw 3 establish a measure of length, a multiple of A mm, and Pk; the measurement scale of the reading screw of the micrometer screw 3 is determined by the formula:

50

45

Taking into account the above ratios of C using the micrometer screw 3 and its reference scale, set the necessary gaps h of the respective ranges of the thickness gauge, on which the values of the measured thicknesses of the coatings are checked.

The invention makes it possible to increase the accuracy of the measurement of the electromagnetic thickness gauges by setting the origin to a relatively accurately known thickness of the non-magnetic plate 4, which performs the function of the gap.

invention formula

A method for calibrating electromagnetic thickness gauges of non-magnetic coatings on an electrically conductive base, which consists in placing a thickness gauge transducer with a spring-loaded sensing element on a specimen of base material mounted on a wedge-shaped plate, moving the latter to change the gap between the transducer and the specimen. , and compare the gap values with

indications of the thickness gauge scale, t - differing from the fact that, in order to improve the accuracy of the calibration, a plate of a known thickness of a nonmagnetic material is placed on the noBepxHoctb sample, the reading of the gauge plates with a known thickness of the nonmagnetic plate is adjusted, the last and move the wedge plate until the scale of the thickness gauge reads with the plate thickness of the nonmagnetic material.,

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Editor A. Ogar

Compiled by I. Rekunov

Tehred V. Kadar Proofreader A "Tysko

Order 2555/46 Circulation 670 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Claim A method of checking electromagnetic thickness gauges of non-magnetic coatings on an electrically conductive basis, namely, that the Thickness gauge transducer with a spring-loaded sensing element is placed on a sample of a base material mounted on a wedge-shaped plate, moving the latter, the gap between the transducer and the sample is changed, and the gap values are compared with the scale thickness gauge, characterized in that, in order to increase the accuracy of verification, a pre-image of the surface of the plate ₅ is placed ca known t lschiny of nonmagnetic material, is brought into compliance with the gauge scale reading with a known value of the nonmagnetic plate thickness, cleaned out and the last wedge plate is moved to match the scale readings from the gauge thickness value plasti.nyiz nonmagnetic material ..