SU1226032A1 - Device for testing radius of concave spherical surface curvature - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to control with high accuracy the radius of curvature of the concave spherical surface of small parts with narrow spherical views, for example, supports for gas-dynamic bearings. The device for controlling the radius of curvature of the concave spherical surface contains a ball-standard made of electrically conductive material in the form of two unequal parts, electrically insulated from one another with an insulating gasket and fitted with electrical contacts to be included in the electrical resistance measurement circuit. With the introduction of a certified sphere-standard with a corresponding radius of curvature into the controlled part, the electrical circuit of the resistance measurement circuit only occurs when the narrow radius of curvature of the narrow part coincides with the radius of curvature of the standard-ball parts, almost at the maximum difference of not more than 0.35 um 3 il. (LU IND O5 about

Description

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The invention relates to a measurement technique and can be used to control narrow spherical concave supports of gas-dynamic bearings.

The aim of the invention is to improve the accuracy of controlling narrow concave spherical poles and simplify measurement by eliminating several measurement operations in various ways.

meridional planes, the accuracy of which depends on the accuracy of the installation of the measuring head, and the elimination of subsequent calculations, as well as due to the possibility of ensuring production control without removing the monitored parts from the workplace where they are processed.

Fig. 1 shows a device for measuring the radius of curvature of a concave spherical surface; in fig. 2 and 3 - the relative position of the controlled part and the standard ball with the radius of the standard ball, greater or smaller, respectively, the radius of the sphere of the controlled part.

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The device for controlling the radius of curvature contains a ball-standard made of electrically conductive material in the form of two unequal spherical parts 1 and 2, isolated from one another by an insulating gasket 3 with the smallest possible thickness, made, for example, of glass fabric with an epoxy component and having a pore thickness for 0.1 mm. The ratio of the sizes of the two parts of the reference ball is chosen so that iso-. The laying is located approximately in the middle of the width of the spherical band under control (Figs. 2 and 3). Both electrically conductive parts 1 and 2 of the reference ball are equipped with electrical contacts 4 and 5, one of which (pin 4) is directly connected to the larger part 2 of the reference ball, and the other contact 5) is connected to its smaller part 1, for example, through the nut 6 and a bolt 7 screwed into the central hole of the reference ball and insulated from its part 2 by an insulating handle sleeve 8. Electrical contacts 4 and 5 are included in the direct current measurement circuit 9, containing the power source 10 and the recording device 11, for example ammeter or ohm122 6032

meter. The ball-standard is made with a sphericity of 0.2 microns. In order to control the radius of curvature along the edges 12 of the concave spherical surface of the part 13, a set of balls is needed whose radii differ from one another, for example, by 0.001 mm. The number of balls in the set is determined by the tolerance on the size of the radius of curvature of the test piece 13.

The device works as follows.

The ball-standard is inserted into the controlled part 13. If the radius of the standard ball is greater than the radius of curvature of the spherical concave part 12 of the controlled part, it is pressed against its outer edge, due to which there is a wedge-shaped air gap between them that prevents the electrical circuit of the resistance measuring circuit 9 from closing. constant current. If the radius of the reference ball is smaller than the radius of curvature of the spherical concave on ska 12, the reference ball is pressed against the inner edge of the ska (Fig. 3), as a result of which there is also a wedge-shaped air gap between them that prevents the circuit of the circuit 9 from closing.

If the radii of the reference ball and the controlled part coincide sufficiently closely, their surfaces fit snugly, so that electrical circuit 9 closes through parts 13 and the ohmic resistance recorded by it decreases from infinity to a finite value.

A gap of 0.1 µm between the surfaces of 12 and the reference ball provides reliable disconnection of the electrical circuit, and the closure occurs at a maximum difference of at-45 of the tested part and the reference ball of 0.35 microns.

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Thus, the device makes it possible to control the radius of curvature of the concave spherical surface of small parts with a narrow spherical surface with high accuracy.

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Claims (1)

Invention Formula A device for controlling the radius of curvature of a concave spherical surface containing a sphere-standard, about one l and Thus, the device makes it possible to control the radius of curvature of the concave spherical surface of small parts with a narrow spherical surface with high accuracy. 55 Invention Formula A device for controlling the radius of curvature of a concave spherical surface containing a sphere-standard, is necessary in order to improve the accuracy of controlling narrow concave spherical trains and to simplify measurement, it is equipped with a direct current electrical resistance measurement circuit reference made of two unequal parts, an insulating gasket insulated from one another and provided with electrical contacts for incorporating them into an electrical resistance measurement circuit. 2 Compiled by S. Skrypnik Editor O. Yurkovetska Tehred V. Kadar Proofreader S. Shekmar . ™. - ".-.. - .-,". ".-„ .. .. „..-- ,, .. Order 2109/27 Circulation 670Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4