SU761824A1 - Apparatus for measuring cylindrical part shapes - Google Patents

Description

The invention relates to a measurement technique, namely, to means for controlling deviations from a cylindrical shape of nominally round parts (cylinder-meters).

A device for measuring the size and shape of machine-building parts (coordinate measuring machine), containing a base (frame), an exemplary rotation spindle, a movable carriage with a meter, carriage guides parallel to the axis of rotation of the spindle, and a reference-recording part [1].

This device is difficult in construction has large dimensions, measurements on it are very time consuming, since considerable time is spent on basing the object being monitored at the measurement position. The measurement results, as a rule, require subsequent mathematical processing, for which the reading-recording part is supplied with a minicomputer.

It is also known a device for measuring errors in the shape of cylindrical parts, for example, for measuring deviations from roundness, containing a base unit of a controlled object, a radially movable carriage with self-aligning supports made in the form of multi-stage balancers, as well as measuring 15

thirty

ten

2

linear displacement between them [2].

Such a device is compact, easy to manufacture and operate, however, it provides a measurement of deviations from roundness in only one section and does not allow to measure deviations from cylindricity.

The aim of the invention is to increase the amount of information received.

This goal is achieved by the fact that the carriage is equipped with a gauge of its radial position, which is made in the form of a straightness standard and linear displacement meter placed on the carriage and interacting with the standard, and the straightness standard is equipped with a base unit on a controlled object made in the form of two groups of multi-stage balance bearings .

FIG. 1 shows the proposed device, front view; in fig. 2 - section A — A of FIG. one; in fig. 3 - a device with a base pattern of straightness on a controlled object.

The device contains a base 1 with centers 2 and 3 for the base of the controlled object, the longitudinal carriage 4 (Fig. 2) with a stand 5, radially movable

a rake 6 connected with a strut arm 7, and a standard 8 straightness parallel to the center line. The supports of the radially movable carriage are made in the form of multi-stage balancers. The balance bar 9 of the first stage is hingedly fastened to the carriage 6, the balance weights 10 and 11 of the second stage are hingedly fastened with the balance bar 9 of the first stage, and the balance weights 12-15 of the third stage are hinged with the second stage balance weights Angular distances μ ₀ - between the hinges of the balancers of the second stage, μι - between the hinges of the balancers of the third stage and μ ₂ - between the contact points of the mentioned balancers correspond to the technical solution [2] and are equal respectively: μ ₀ = 103 °; μι = 40 ° and μ ₂ = 25 °, which ensures that the radial coordinate of the carriage is practically independent of the non-circularity of the controlled section.

The radially movable carriage 6 carries two linear displacement gauges, the first 16 of which are placed on the bisector of the angle μ ₀ and interact with the object being monitored, and the second 17 with the standard of straightness 8. An alternative embodiment of the device is shown in FIG. 3. In this case, the standard 8 straightness mounted on racks 18 and 19, equipped with self-aligning balance bearings, similar to the balance supports radially movable carriage and interacting with the controlled object in the extreme sections.

The device works as follows.

The controlled object is installed in centers 2 and 3, the position of the longitudinal carriage 4 selects a controlled cross section and radially movable carriage 6 is fed to it. Then the controlled object is turned in the centers and a non-circularity of the controlled cross section is noted by the meter 16 linear displacements. At the same time, by measuring 17, the radial position of the monitored section and the change of this position in one revolution of the monitored object are noted, which makes it possible to determine the first harmonic (beat) of the monitored section. The measurement result will be free from the influence of errors in the shape of the controlled section.

Moving the longitudinal carriage 4 along the axis of the object being monitored, without rotating the latter one can measure the averaged shape of the generator, and turning the object in each section one turn, the axis shape of the object being monitored.

When the device operates in an alternative embodiment, the standard of straightness is based on the object being monitored / that allows you to directly measure the curvilinearity of its axis (like the beat of the average section).

The device is simple in design and convenient to operate. When used as measuring instruments for linear displacements of measuring transducers with recorders, it is possible to obtain objective graphical information on the shape of the section, the shape of the generator and the shape of the axis of the object being monitored.

Claims (3)

Claim 1. A device for measuring errors in the shape of cylindrical parts, containing a base unit of the object to be monitored, a radially movable carriage with self-aligning supports made in the form of multi-stage balancers, and a linear displacement meter installed between them, characterized in that in order to increase the volume received information, the carriage is provided with a gauge of its radial position. 2. Device by π. 1, characterized in that the radial position meter of the carriage is made in the form of a straightness standard and a linear displacement meter placed on the carriage and interacting with the standard. 3. The device according to claims 1 and 2, characterized in that the standard of straightness is equipped with a home node for a controlled object, made in the form of two corpses of multi-stage balance supports.