SU1401272A1 - Device for checking quality of machining part holes - Google Patents

Abstract

The invention relates to a measuring technique and can be used, in particular, to control the quality of the machining of the holes of parts in the instrument and mechanical engineering. The purpose of the invention is to improve the accuracy of control. The device contains successively located source 1 light., Collimator 2, annular diaphragm 3, two conical mirrors 4 and 7 with an external mirror surface, two conical mirrors 5, 6 with an internal mirror surface, kinematically connected to each other, a splitter 8. the photodetector 9 is located in the current passing from the beam splitter 8, two light guides 10, 11 with photodetectors 12, 13. The input end of the light guide 10 covers the input end of the light guide P. If the size of the hole of the part 20 deviates from tolerance, chasing arriving at fotoprie.mniki 12, 13. At one photodetector receives a greater signal to the other - the smaller, allowing the control deviation mark. 1 il. SS (L

Description

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The invention relates to a measuring technique and can be used, in particular, to control the quality of the machining of the holes of parts in the instrument and mechanical engineering.

The purpose of the invention is to improve the measurement accuracy by simultaneously obtaining three signals, which characterize both the surface roughness in the control zone and the deviation of the hole size from the specified size, and the sign of this deviation.

The drawing shows a schematic diagram of the device for controlling the quality of machining holes of parts.

The device contains consecutive light source 1, collimator 2, annular diaphragm 3, conical mirror 4 with an outer mirror surface, along conical mirrors 5 and 6 with an inner mirror surface, conical mirror 7 with an outer mirror surface, a beam splitter 8 and the first photodetector located after the splitter 9 and two optical fibers 10 and 11 with the second and third photodetectors 12 and 13. The input ends of the optical fibers 10 and 1 are facing the beam splitter 8 and are made in the form of concentric rings. On base 14, there are carriages 15 and 16 for positioning mirrors 5 and 6 on them and an actuator 17 for stirring the carriages 15 and 16 relative to each other, connected to the actuator 18 for moving the carriage 19 on which the workpiece 20 is located. 18 and the carriage 19 form a unit for relocating the part 20.

The device works as follows.

The light beam from the light source 1 is converted by the collimator 2 into a parallel beam, from which an annular beam is cut out with an annular diaphragm 3. The formed beam is directed at the mirrors 4 and 5, having reflected from which, the beam is transformed in diameter and directed at a certain angle onto the controlled surface of part 20 along the entire perimeter of the hole. Reflected from this surface, the beam through mirrors 6 and 7 is directed to the beam splitter 8. Part of the flow, reflected from the beam splitter 8, hits the photodetector 9, another part of the flow, passing through the beam splitter 8, hits the entrance to the Hbie ends of the optical fibers 10 and 11 and is sensed by the photodetectors 12 and 13.

The signals from photodetectors 9, 12., 13 are fed to a recording device (not shown).

A pair of mirrors 5 and 6 using the actuator 17 has the ability to change its spatial position and at each moment

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Trol is located in relation to the mirrors 4 and 7 so that the formed annular beam, reflected from the surface of the part 20, falls on the input ends of the optical fibers 10 and 11.

When the carriage 19 moves progressively with the part 20 from the photodetector 9, a surface chart is recorded which must not exceed certain limits corresponding to the specified roughness, and two diagrams are recorded from the photodetectors 12 and 13, each of which runs at a certain distance and equidistant to the diagram roughness if the hole size is within the specified tolerance. If the hole size is not in the specified tolerance, then the radiation flux reflected from the part 20 shifts relative to the input ends of the optical fibers 10 and 11, which leads to a change in signals from the photodetectors 12 and 13 and the equidistance of the signals recorded from the photoelectric detectors 12 and 13 gramm.m relative to the niepoxoBaity diagram recorded from the photodetector 9.

For example, if the aperture size is larger than a predetermined size, the radiation flux reflected from part 20 and mirrors 6 and 7 is shifted in the direction of the light guide K), which leads to an increase in the signal from the photodetector 12 and a decrease in the signal from the photodetector 13. In accordance with this, the distances from each of the diagrams obtained from the photodetectors 12 and 13 to the roughness diagram change, which makes it possible to control the sign of the deviation of the hole size from the specified tolerance.

Claims (1)

Invention Formula A device for controlling the quality of machining holes of parts, comprising a successive light source, a collimator, an annular diaphragm, four conical mirrors, two of which are kinematically connected to each other and made with an internal mirror surface, and the other two are made with an external mirror surface, a light-guide. 1, two photodetectors, the first of which is installed in the radiation flux reflected from the beam splitter, and a unit for moving the part, characterized in that, in order to increase the accuracy l, it is provided with two light guides, established in the course of radiation after the beam splitter so that the input end of the optical fiber end face covers v.hodnoy another along a closed line, and the third photodetector, and the second and third photodetectors are mounted respectively on the output ends of the optical fibers.