SU120340A1 - Device for contactless measurement of the hole diameter in the process of honing - Google Patents

Description

Devices for contactless measurement of the diameter of the hole in the process of honing it by changing the pressure of the fluid, in particular the cooling fluid supplied by the nozzles, are known.

A distinctive feature of the proposed device of the same type is to mount the nozzles in the hollow ring above the workpiece but the circumference against the abrasive bars to interact with the supplied fluid at the moments of overrun. This embodiment of the proposed device provides for the determination of the diameter of the hole by measuring the diameter of the abrasive bars, which especially facilitates the measurement of holes of small diameter.

The proposed device is schematically shown in FIG. 1 and 2 in two forms.

A hollow ring 2 is installed over the workpiece / (fig. 1) with nozzles 3 through which a cooling fluid, such as kerosene, flows. The internal ring size is 0.1-0.2 mm larger than the nominal size of the hole being machined. The number of nozzles is equal to the number of bars 4 xoiia 5. With the reciprocating and rotational movements of the hone 5, the abrasive bars 4, which

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exit from the aperture to - -. its length (non-tail) is periodically installed against the nozzles 3, increasing the resistance to the passage of kerosene.

As the pressure is removed, the hone diameter 5 increases, the distance between bar 4 and seat 3 decreases, and the pressure in the kerosene network increases. By adjusting the differential system to measure the pressure of kerosene at a certain pressure, it is difficult to ensure that the sensor of the measuring system triggers on and off 4

No. 120340-2 -

ka on reaching the specified size. Due to the fact that the nozzles are located around the circumference, the total resistance of the nozzles at the displacement of the hone will be constant.

Since the frequency of the pulses (overlapping of nozzles with bars), equal to Zn (z-number of bars, n-number of turns of hone per minute), can reach quite a significant value, the sensor should be built in such a way that it can measure a short-term pulse of pressure change , and its inertia should be sufficiently small.

FIG. 2 shows another embodiment of the device, according to which the ring 2 with the nozzles 3 receives rotation from the shpindles 6 through the gears 7 and the slotted shaft 8 in such a way that the number of revolutions of the ring 2 and hone 5 is the same. In this case, the axes of the bar and the nozzles will always be in the same vertical plane. Such a scheme simplifies the design of the sensor, which should take not a short-term impulse, but will produce a continuous measurement during overrun, i.e., the exit of the bars upwards from the hole being machined.

Subject invention

Claims (2)

1. A device for contactless measurement of the diameter of the hole in the process of honing it by changing the pressure of the liquid, in particular a cooling, supplied by nozzles, characterized in that, to determine the diameter of the hole by measuring the diameter of the abrasive bars and enabling the measurement of holes of small diameters, the nozzles are mounted above the workpiece in the hollow ring around the circumference against the abrasive bars to interact with them at moments of overrun. 2. The form of the apparatus according to claim 1, wherein the hollow ring with the nozzles is made rotating with the hone in order to ensure continuous measurement of the bars during their overrun.