PL211360B1 - Pneumatic gauge, preferably for roundness deviation measurement - Google Patents

Description

REPUBLIC

POLAND

Patent Office of the Republic of Poland (12) PATENT DESCRIPTION (19) PL (11) 211360 (13) B1 (21) Application number: 384845 ^{(51) Int.Cl.}

G01B 5/20 (2006.01) G01B 5/10 (2006.01) G01B 13/16 (2006.01) (22) Date of notification: 03/04/2008 (54) Pneumatic bore gauge, especially for measuring roundness deviation

(73) The right holder of the patent: (43) Application was announced: POZNAŃ UNIVERSITY OF TECHNOLOGY, Poznań, PL 12.10.2009 BUP 21/09 (72) Inventor (s): CZESŁAW JANUSZ JERMAK, Poznań, PL (45) The grant of the patent was announced: May 31, 2012 WUP 05/12 (74) Representative: item. stalemate. Barbara Urbańska-Łuczak

PL 211 360 B1

Description of the invention

The subject of the invention is a pneumatic bore gauge, in particular for measuring roundness deviation.

There are known design solutions of non-contact pneumatic bore sizes from companies such as LOS, Mahr, Marposs, Mercer, and Nieberding. They are two-nozzle or multi-nozzle bore gauges characterized by a common feeding channel preceded by an inlet nozzle usually located in the measuring device. The number of nozzles affects the differentiation of the type of the measured roundness deviation, usually it is possible to measure ovality and triangularity. Separately powered combinations of pairs of nozzles located in precisely defined planes of the bore are also used, thus improving the detectability of the components of the measured profile. Detection of a specific shape error takes place during the relative movement of the bore and the measured hole. The disadvantage of the described solutions is the possibility of measuring only strictly defined deviations, e.g. ovality, triangularity. It is not possible to reproduce the complete roundness deviation.

The essence of the invention is a pneumatic bore gauge, especially for measuring the deviation of roundness, in the form of a cylinder, for insertion into the inner measuring space of the bore, which has three radial flow channels, each of which ends in the outlet zone with a measuring nozzle and has an inlet nozzle in the inlet channel, the axes of the flow channels and measuring nozzles embedded in them are situated in a plane perpendicular to the main axis of the bore gauge at an angle α> 90 °, moreover, in each flow channel there is a probe hole for pressure measurement, besides, the axes of the inlet channels openings are located at a distance R2, and the axis of the probe opening at a distance of R1 from the axis of the body, additionally the body has return air channels, with the inlet on the external and front surfaces of the body, and the outlet in the area of the interior of the body.

Thanks to the solution according to the invention, the roundness deviation was measured, regardless of its form, and the dimensional deviation was measured.

The bore gauge according to the invention is shown in an exemplary embodiment, where Fig. 1 shows the bore gauge in a horizontal section A-A, and Fig. 2 in a vertical section B-B.

The bore gauge for measuring the roundness deviation in the form of a body 1 is shaped as a cylinder with a diameter D ensuring that the part to be measured is inserted with an appropriate clearance into the measurement space of the bore. The connection with the external handle is provided by a threaded joint 8. In the bore gauge there are radially three flow channels 2, each of which ends on the outer side of the bore with a measuring nozzle 3, and on the air inlet side with an inlet nozzle 4. Axes of channels 2 and nozzles 3 embedded in them are situated in a plane perpendicular to the bore axis at an angle α> 90 °.

A probe 5 for measuring the pressure is also provided in the flow channel 2. The axes of the probe opening 5 and the opening of the inlet channel 7 are made at a distance of R1 and R2 from the bore axis, respectively. In order to remove air from the measuring space, the body 1 has return ducts 6.

The measurement of the roundness deviation consists in the fact that the bore gauge associated with the external articulated holder (not shown in the drawing) is connected by means of a connector 8 through a connector screwed into the opening of the inlet channel 7 to a compressed air source with a specified pressure (not shown in the drawing). Pressure sensors (not shown in the figure) are connected to the probing holes to convert the pressure signal into an electrical signal. The bore gauge is placed in the bore of the part to be measured and rotated through 360 °. During the rotation, the distance between the face of each of the three measuring nozzles 3 and the surface of the part to be measured changes, creating a pressure in each of the flow channels 2 inversely proportional to this distance. The signals from the connected pressure transducers are directed to a computer, not shown in the picture, where the roundness deviation is calculated.

Claims (1)

Patent claim A pneumatic bore gauge, especially for measuring the deviation of roundness, in the form of a cylinder for insertion into the internal measuring space of the cylinder, characterized in that it has three radial flow channels (2), each of which ends in the outlet zone with a measuring nozzle (3), and has the inlet channel (7) the inlet nozzle (4), the axes of the flow channels (2) and the measuring nozzles (3) embedded therein are situated in a plane perpendicular to the main axis of the bore at an angle α> 90 °, moreover in in each flow channel (2) there is a probing hole (5) for pressure measurement, in addition, the axes of the holes of the inlet channels (7) are located at a distance of R2, and the probing hole (5) at a distance of R1 from the axis of the body (1), additionally the body (1) has air return channels (6), with an inlet on the outer and front surfaces of the body (1), and an outlet in the interior area of the body (1).