RU2269091C1 - Arrangement for calibration of cylindrical angles - Google Patents

Abstract

FIELD: the invention refers to measuring technique particularly to arrangements for definition of deflection of perpendicularity of measuring surfaces to the support surfaces of calibrating cylindrical angles.

SUBSTANCE: the arrangement has a tripod with fixed on it a measuring head with a ferrule and a stop for the angle. At that the arrangement is provided with a carrying tripod plate with support legs with a copper-coated spherical surface and a prismatic cut as a stop which has adds with contact cylindrical surface fixed along its perimeter. The measuring head with the ferrule is fixed on the tripod along the axle of the symmetry of the prismatic cut with the help of clamps and a rod between them.

EFFECT: increasing accuracy of calibration and simplification of the process of measuring.

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Description

The invention relates to the field of measuring equipment, and more specifically to devices for determining deviations from the perpendicularity of the measuring surfaces to the supporting surfaces of the calibration cylindrical squares.

A square is an angular measure with a working angle of 90 °, used in mechanical engineering to verify the perpendicularity of the sides of a part. A cylindrical square is a cylindrical shaft in which the end face is perpendicular to the generatrix.

Calibration of squares is carried out mainly by comparison with an exemplary square with an estimate of the deflection by clearance or by measuring head (see N.N. Markov, G.M. Ganevsky "Design, calculation and operation of measuring tools and instruments", M .: Engineering, 1981, p. 249-250).

The disadvantage of the verification method by comparing it with an exemplary square with the estimation of the deflection to clearance is the lack of accuracy of the calibration, since probes with a certain thickness are used in the measurement, and, in addition, when measuring the clearance of the probe, the surface of the square may be damaged by the edges of the probe.

The closest in technical essence is a device for checking cylindrical squares, containing a tripod with a measuring head attached to it with a tip and an emphasis for a square (see. Methodological instructions. Squares for calibration 90 °. Test procedure. MI 1799-87, M., ed. in standards, 1988, pp. 9-10, Fig. 4).

As a stop, a cylindrical roller is used, fixed by clamps on the calibration plate. The lever-gear measuring head is equipped with a flat tip. When checking the working surface of the flat tip should be parallel to the generatrix of the roller stop. The controlled square is mounted on the calibration plate and pressed against the stop.

A disadvantage of the known design of a device for checking cylindrical squares is that it does not provide the necessary accuracy of verification due to the fact that it is difficult to maintain the parallelism of the generatrix of the roller stop fixed by a clamp and the working surface of a flat tip, while the cylindrical square is not fixed in a predetermined position .

The objective of the present invention is to provide a device to improve the accuracy of calibration and simplify the process.

The object is achieved in that the device for checking cylindrical angles, containing a tripod with a measuring head fixed to it with a tip and an emphasis for the angle, according to the invention is equipped with a support tripod plate with support legs with a copper-plated spherical surface and a prismatic cutout as an emphasis with fixed on it perimeters with contact cylindrical surface, and the measuring head with a tip is mounted on a tripod along the axis of symmetry of the prismatic cut with u collars and shaft therebetween.

Such a structural embodiment of the device for checking cylindrical squares allows to increase the accuracy of calibration due to the fact that the verified cylindrical square is fixed in a prismatic stop, along the axis of symmetry of which the measuring tip is located. At the same time, the device allows the calibration of squares of various diameters from one installation of a plate with a tripod on a calibration plate.

In addition, the device can be quickly assembled and disassembled, which allows the metrologist to verify cylindrical squares directly at the workplace.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

figure 1 shows a device for checking cylindrical squares;

figure 2 is a section aa in figure 1;

figure 3 is a section bB in figure 2;

figure 4 is a cross-section bb in figure 1;

figure 5 - section CC in figure 4.

A device for checking cylindrical squares consists of a plate 1 with three support legs 2 with a copper-plated spherical surface; a tripod 3 mounted on the plate 1, on which the measuring head 4 with a flat or spherical tip 5 is mounted with the possibility of movement.

On the plate 1, as a stop for a cylindrical elbow, a prismatic cutout is made with fixings 6 fixed on its perimeter with a contact cylindrical surface.

The tripod 3 is mounted on the plate 1 with an offset relative to the axis of symmetry of the prismatic cutout. A clamp 7 is mounted on a tripod 3, the ends of which are connected by a bolt 8 with a wing 9. In the head 10 of the bolt 8, a hole is made for installing a rod 11 that carries the clamp 12, mounted on the housing of the measuring head 4. A tip 5 mounted on the clamp 12 is also mounted along the axis of symmetry of the prismatic cutout on the plate 1 and along the axis of the measuring head 4.

For mounting the device on the calibration plate 13, a clamp (not shown) is provided.

The device operates as follows.

On the calibration plate 13, strengthen the clamp plate 1 with a tripod 3, carrying the measuring head 4 with the tip 5. The controlled elbow 14 is installed in the prismatic cutout of the plate 1 and pressed against the cylindrical adjustments 6. The measuring tip 5 of the head 4 is brought by moving the rod 11 to the measuring surface of the square 14 at a distance of 2-3 mm from the upper edge, fix the position of the rod 11 with the lamb 9 and take the readings of the measuring head 4. Measurements are carried out in at least three diametrical sections of the square. Deviation from perpendicularity is determined in a known manner.

The proposed device for checking cylindrical squares in comparison with the known allows to increase the accuracy of verification.

Claims (1)

A device for checking cylindrical angles, comprising a tripod with a measuring head attached to it with a tip and an emphasis for a square, characterized in that it is equipped with a support tripod with support plates with a copper-plated spherical surface and a prismatic cutout as an abutment with adjustments fixed along its perimeter with contact cylindrical surface, and the measuring head with a tip is mounted on a tripod along the axis of symmetry of the prismatic cut with the help of clamps and a rod between them.

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