SU875210A1 - Method of measuring misalignment of two openings and device for effecting same - Google Patents

Description

(54) METHOD OF MEASURING MISSING TWO HOLES AND CONSTITUTION FOR ITS IMPLEMENTATION

I

The invention relates to measurement technology and can be used for measuring. Pivotal hole sprocket ...

There is a known method for measuring the misalignment of two holes, which consists in that two nozzles are installed opposite each other in the holes, alternately supply gas to them and measure its pressure at the exit of the nozzles. The magnitude of the pressure is judged on the magnitude of the misalignment of the holes. A device for carrying out this method comprises nozzles for placement in controlled openings, a power source communicated with the nozzles and a gas pressure meter in the nozzles {1.

However, this method has a low accuracy of measurement, since it does not allow to distinguish the distance between the axes and the angle of their creaking.

The purpose of the invention is to improve the measurement accuracy.

The goal is achieved by placing a screen between the nozzles, moving it relative to the nozzles, measuring the pressure differences of the gas jets flowing out and:}

nozzles onto the screen at different points of the screen's movement path, determine the pressure differences at these points, and the misalignment values and the axial crossing angle are obtained from the difference values.

In the device for implementing the method, the pressure gauge is made in the form of an elastic diaphragm, on which strain gages connected to the measuring circuit are fixed on both sides.

ten

The axis of the gas jet coincides with the axis of the hole. The pressure of the jet to the screen at any point is determined between two characteristic distances: between the nozzle and the screen.

IS and from point to jet axis. The dependences of pressures on characteristic distances are unambiguous and with large gradients. This allows displacing the screen from the middle between the nozzles to a position along and across the jets, according to the obtained

Claims (2)

To set 20 depending on the differential pressure on the screen, to establish coaxial or non-coaxial holes, the distance between the axes of the holes in any plane and the angle of crossing of the axes. 3 The absence of a differential pressure on an equi-screen screen, equidistant from the ends of the nozzles and located on the lines, connected by a thick center of the ends, indicates coaxiality of the holes. The drawing shows a device for measuring the misalignment of two holes. The device contains a power source 1, two identical nozzles 2 and 3 placed in the housing 4, a screen 5 with an elastic diaphragm 6 and strain gauges 7 and 8 mounted on the diaphragm on both sides and included in prices with measuring devices 9 and 10. The screen is placed between nozzles 2 and 3 at equal distance from them. The method using the proposed device is carried out as follows. From the power source 1, nozzles 2 and 3 are supplied with air at the same pressure and receive identical air jets. If the nozzles are coaxial, the effect of the jets on the screen is mutually compensated, the strain gauges are not deformed and devices 9 and 10 show that the pressure difference on the screen is zero. When the axes of the jet are displaced, the diaphragm will be deformed in proportion to the distance between the axes of the jets in the screen plane. Using strain gauges, the magnitude of the deformation is measured and the specified distance is obtained, then the screen 5 is shifted to one of the nozzles. From the known dependences of the jet pressure on the screen on the characteristic distances, which can be represented by graphs, determine the pressure difference (readings of instruments 9 and 10), which should be in case of maintaining the previously measured distance between the axes of the jets in the new position of the screen 5 The readings from the instruments 9 and 10 are read out and, according to the differences in the actual readings of the instruments and obtained from the known dependencies, the distance between the axes of the jets is obtained, and equivalently, between the axes of the holes in the new position of the screen. The equality of the distances between the axes of the aperture at two positions of the screen indicates that the axes of the apertures are parallel and displaced by the obtained value. From the difference in the distances between the axes of the holes at the two positions of the screen and the distances from the screen to the nozzles, the angle of crossing of the jet axes, i.e. cross angle of hole axes. To improve the accuracy of measurement, the distances between the axes of the holes can be carried out at several points of the path of movement of the screen between the nozzles, followed by processing the results of measurements using known dependencies. their crossing. Claim 1. A method for measuring the axial alignment of two holes, consisting in that two nozzles are installed in the holes, facing each other, supplying gas to them and measuring its pressure, characterized in that, in order to improve measurement accuracy, a screen is placed between the nozzles , move it relative to the nozzles, measure the pressure differences of the gas jets flowing from each opla to the screen at different points of the screen's trajectory, determine the pressure differences at these points and, using the values of the resulting differences, get the values osnosti angle and mating axes. 2. A device for measuring the mismatch of two holes, containing a sonpa, intended for placement in controlled from; Versions, a power source communicating with the nozzles, and a meter, characterized in that the pressure meter is made in the form of an elastic diaphragm, on which the strain gages included in the measuring circuit are fixed on both sides. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 484388, cl. G 01 13/19 1975 (prototype).