SU1388714A1 - Method of measuring angles of turn of object - Google Patents

Abstract

The invention allows the verification of the angles of rotation of objects, for example, metal-cutting machine tools. The aim of the invention is to improve the measurement accuracy by comparing different sections of the goniometric-measuring system of the object being scanned with the same angular measure using an autocollimator. The radiation from the autocollimator is directed to one of the two mirrors that form the angular measure, which is mounted on the platform of the rotary assembly. The turn node, in turn, is preset on the object to be turned. Combine the image of the autocollimation mark from the first mirror with the measure itself and take the countdown from i-; the measuring goniometric system of the object to be turned, then rotate the object with the rotating unit on it until the autocollimating image of the mark from the second mirror of the angular measure coincides with the mark itself, again read the measurement system of the object, find the angle between the two removed samples . The swivel unit is returned to its initial j position, when the autocollimation image of the mark from the first mirror coincides with the mark itself. After that, the turned object is rotated together with the rotary unit by the amount of the angle found, and the value of the shift of the autocollimation image of the mark from the second mirror, which characterizes the error of the angle of rotation of the turned object, is determined using the measuring system of the autocollimator. Repeat these actions many times, determine the magnitude of the error of the rotation angle in the whole range of angles of rotation of the object being turned. One of the mirrors forming the angular measure is installed with the possibility of rotation relative to the other mirror, thereby changing the angle of the angular measure, which allows you to set any rotation step of the object being turned. 1 il. (L co

Description

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The invention relates to a measurement technique and can be used to measure angles in mechanical engineering.

The purpose of the invention is to improve the measurement accuracy by comparing different sections of the angular measuring system of the object to be tested with the same angular measure by the autocollimation method.

The drawing shows a diagram of the proposed device.

The device contains two mirrors 1 and 2, which form an angular measure, an autocollimator 3 and a swivel unit including platform 4, axis 5 and base 6. Platform 4 is installed with the possibility of rotation around axis 5.

The drawing also shows a rotating object 7, the axis of rotation of which is aligned with the axis of rotation of the platform.

One of the angular measure mirrors is rotatably mounted around an axis parallel to the axis of rotation of the platform to change the angle d of the angular measure.

Mirrors 1 and 2 are installed on the platform 4 of the swivel unit.

The device works as follows.

Pre-install the base 6 swivel node in the center

object to be turned 7 so that axis 5 coincides with the axis of rotation of the object. Then the mirrors 1 and 2 are mounted on the platform 4 so that their reflecting planes are parallel to the axis of rotation of the platform. The angle (between the mirrors determines the pitch with which the calibration of the measuring system of the object being monitored is carried out.

The radiation from the autocollimator 3 is directed to the first mirror F and the image of the autocollimation mark is combined with the mark itself. The readout is taken from the measuring system of the object being turned on (not shown), after which the rotation is turned around: 1kt 7 with the swivel unit mounted on it to a position at which the autocollimation image of the mark from the second 2 is not compatible with the mark of the autocollimator itself. The second reading is taken from the measuring system of the object to be scanned, and the difference between them is found to be an angle ot, which is later taken as the reference, from which

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Secondly, all further angles of rotation of the object being turned are compared.

To measure the next angle, rotate platform 4 with mirrors 1 and 2 to the initial position, in which the autocollimation image of the brand is again aligned with the brand itself. Take a reading on the measuring system of the object. Then turn the object with the rotary knot by an angle equal to the angle (L, while the platform rotates to a position in which the autocollimation image from the second mirror 2 is in the field of view of the autocollimator. In the absence of an error in the angle of rotation of the object being turned, the autocollimation image is aligned with the mark itself, and if the mark image does not coincide with the mark itself, the angular value of its displacement (D) is determined by the measuring scale of the autocollimator, which characterizes the error of the angle of rotation of the object :

 d 1 Oe

The repetition of similar actions consistently determine the error of the angles of rotation of the object in all its range of angles:

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 ъ t - - - d, Р,.

and compare the obtained values of | E with the permissible error of the angles of rotation of the object.

Claims (1)

The proposed device (unlike the known ones) allows the relative method to measure the rotational error of the object being turned, comparing its different sections with the same angular measure, while it is possible to change the angle in the angular measure by installing one of the mirrors forming it. rotation, thereby setting a different step when measuring the error of the angles of rotation of the object. Invention Formula A device for measuring the angles of rotation of an object, comprising a base, an axis and a platform mounted on it with the possibility of reversible rotation and fixation of its position forming a swivel unit designed to be fixed on the measured object with its axis aligned with the axis of rotation of the object, the first mirror mounted on the platform parallel to the axis, and an autocollimator mounted perpendicular to the axis of the rotary unit and optically It is equipped with a mirror, characterized in that, in order to improve measurement accuracy, it is equipped with a second mirror mounted on the platform parallel to its axis with the possibility of rotation around an axis parallel to the platform axis and fixing B in a predetermined position and forming an angular me ru.