SU1422005A1 - Device for checking quality of cylindrical hole surfaces - Google Patents

Description

(21) 4226249 / 24-28

(22) 04/08/87

(46) 09/07/88. Bul No. 33

(71) Moscow Aviation Technological Institute. K. E. Tsiolkovsky

(72) C. M. Suminov, E. I. Grebenyuk, A. D. Vitman and E. B. Zaichenkova

(53) 531.7 (088.8)

(56) USSR Copyright Certificate No. 938010, cl. G 01 B 11/30, 1982.

(54) DEVICE FOR CONTROL OF QUALITY OF THE SURFACE OF CYLINDRICAL HOLES

(57) The invention relates to a measurement technique. The aim of the invention is to expand the functionality of the device by controlling the end surface of the test hole and eliminating the possibility of re-registration of the same defect on the end surface. The device for monitoring the quality of the surface of the cylindrical holes contains an optically coupled laser I, a focusing lens 2 and an axicon 3, which forms a light ring on the sides of the hole by the disks 8. The light flux scattered on the defects of the cylindrical surface is perceived by the sectional fiber optic light guide 10 and directed to the respective radiation receivers 11. When the device moves along the axis of the part 8, when the distance from the focusing lens 7 to the end face of the hole of the part 8 is equal to the focus distance of the lens 7, the position sensor 12 issues a command to the unit 9 for moving the laser beam 1, which connects the laser beam 1 to the input the end of the light guide 5. Passing through the light guide and focusing the cylindrical lens 7 into a line directed along the radius of the end part of the hole, the laser beam 1 illuminates the end surface of the part 8 hole. The light scattered on defects is perceived by the light guide sections 4, 6 15 is transmitted to the receivers radiation. The design of measuring channels 17 makes it possible to exclude a false impulse of the defect axis with a symmetrical profile shape. 6 Il.

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1 to y

ate

The invention relates to a measurement technique and can be used to control the quality of the surface of cylindrical holes.

The aim of the invention is to expand the functionality of the device by ensuring control of the end surface of the test hole and eliminating the possibility of re-registration of the same. end surface defect.

FIG. 1 shows a functional diagram of the device; in fig. 2-4 g - sections A-A, BB, B-B in FIG. 1, respectively; in fig. 5 shows the moments of interaction of the laser radiation with an end surface defect; in fig. 6

by a serial input of a beam moving unit 9 of the laser 1, 2M of additional radiation receivers 15 installed on the respective sections of the output ends of the first and third additional lights 4 and 6, the processing block 16 with N main inputs each of which is associated with the output of the corresponding receiver 11 radiation and M additional inputs, M identical measuring channels 17,

10 each of which contains serially connected first amplifier 18, the input of which is the first input of the corresponding measuring channel 17, the first comparator 19, the integrating circuit 20, the first inverter 21 and the three-input element

 , 1gg

Diagram 22, the output of which is the output of the voltage frame at various points of the mouth of the corresponding measuring channel 17,

roystva. consistently connected second amplifier

The device contains optically coupled 23, the input of which is the second input

the present laser 1, the focusing lens 2 and the axi- corresponding measuring channel con 3, mounted upwards to 20 17, the second comparator 24 and the second inverter to laser radiation 1, three additional 25, the output of which is connected to the third input of the three-input element I 22, waiting for the multivibrator 26 whose input is associated with

parallel fiber 4-6, the first and third light guides 4 and 6 of which are located symmetrically with respect to the second

the output of the first comparator 19, output - with

additional light guide 5 and which, by the second input of the three-input element I 22, mounted in the cavity of the axicon 3, are represented by .-. ..- l-

A part of the axicon 3 volume, its base is the 90 ° sector of the axicon 3 base, and the sides are formed along the axicon 3, the planes of the input ends of the first and third additional light guides 4 and 6 and the output end of the second additional light guide 5 are located in the axicon 3 base planes and have the form of rectangles, the long sides of which are parallel to the radius of the axicon 3 base, the input and output ends of the first and third additional light guides 4 and 6 are made in the form of M rectangular sections The input end of the second additional light guide 5 is installed perpendicularly optically each of the M additional inputs of the processing unit 16 is connected to the output of the corresponding measuring channel 17, the first and second inputs of which are connected to the outputs of the additional radiation receivers 15, which are symmetrical relative to the second additional signal. light guide 5. rectangular sections of the output ends of the first and third additional light guides 4 and 6, respectively.

The device works as follows.

The laser beam 1 is focused by the lens 2 on the surface of the controlled hole, being formed with the help of axicon 3 into a light ring illuminating 3/4 of the perimeter of the hole, 1/4 of the perimeter is closed by the solar axis 1, with additional focusing 4-6 and therefore when moving

A cylindrical lens 7, forming a parallel to the radius of the axicon 3 and installed on the output end of the second additional light guide 5 between this end and the device inside the part, is controlled only 3/4 of the perimeter. The light flux scattered on the defects of the cylindrical surface is perceived by a sectional 10n fiber optic light guide guiding the surface of the aperture of the workpiece 8, blocked to the corresponding receivers 11 of 9 by moving the laser beam 1 installed between the laser 1 and the input end of the second additional light guide 5, the ring light guide 10 The input and output ends of which are made in the form of N ring sections, N radiation detectors 11, each of which is associated with a corresponding ring section of the output end of the light guide 10 , a position sensor 12 associated with the actuator 13. the movement of the device along the axis of the part is connected with the actuator 14 of the rotational movement of the part 8 relative to the axis of the laser 1, the output of the sensor 12 is connected to an elect

radiation. The surface is scanned when the device moves progressively along the axis of the part, which is provided by any known drive 13. When the device moves such that the distance from the focusing lens 7 to the end of the hole of the part 8 is equal to the focal length of the lens, which is ensured by any known sensor 12 unit 9 moves the beam of the laser beam of the St.-55 Zera-1 parallel to itself at the input end of the light guide 5. Pass through the light guide and focusing with a cylindrical lens 7 to the line directed along p a2005

2

by a serial input of a beam moving unit 9 of the laser 1, 2M of additional radiation receivers 15 installed on the respective sections of the output ends of the first and third additional lights 4 and 6, the processing block 16 with N main inputs each of which is associated with the output of the corresponding receiver 11 radiation and M additional inputs, M identical measuring channels 17,

10 each of which contains serially connected first amplifier 18, the input of which is the first input of the corresponding measuring channel 17, the first comparator 19, the integrating circuit 20, the first inverter 21 and the three-input element

 , 1gg

 And 22, the output of which is the output of the corresponding measuring channel 17,

the output of the first comparator 19, output - with

 the second input of the three-input element And 22, .-. ..- l-

the second input of the three-input element And 22, .-. ..- l-

Each of the M additional inputs of the processing unit 16 is connected to the output of the corresponding measuring channel 17, the first and second inputs of which are connected to the outputs of the additional radiation receivers 15, mounted on the symmetrical sections of the second additional optical fiber 5. The right-angled sections of the output ends and the third additional light guides 4 and 6.

The device works as follows.

The laser beam 1 is focused by the lens 2 on the surface of the controlled hole, being formed with the help of axicon 3 into a light ring illuminating 3/4 of the perimeter of the hole, 1/4 of the perimeter is closed by optical fibers 4-6 and therefore when moving

The device inside the part is controlled by only 3/4 of the perimeter. The light flux scattered on the defects of the cylindrical surface is perceived by a 10n sectional fiber optic fiber and is directed to the corresponding receivers 11 of 50

55

the edge of the hole, the laser beam illuminates the end surface of the part 8. The light flux scattered on the defects of the hole end face is perceived

sections of the input ends of the optical fibers 4 and 6. of their given processing technology. Installation of two symmetrical receivers

this defect. The value of T is determined individually for each part 8 experimentally and depends, as a rule, on the parameters of the ensemble of defects, the half-conductors 4 and b contributes to an increase in the reliability of control due to the possibility of registering defects with an asymmetrical section of the profile. The implementation of the light guides 4 and 6 sectional leads to an increase in the sensitivity of the control due to the differentiation in the evaluation of the luminous flux. The registration of the scattered light flux is performed by the radiation receivers 15.

Claims (1)

Invention Formula A device for monitoring the quality of the surface of cylindrical holes, containing an optically coupled laser, focusing a lens, an axicon mounted at the top of the laser radiation, a light guide whose entrance and exit ends are made in the form of N ring sections and N radiation detectors, each of which, when deformations are present on the surface, they are associated with the corresponding ring-patterns with a symmetric profile form from the same defect, the light pulses are perceived by the symmetric sections of the optical fibers 4 and 6, since and sequentially enter each section A section of the output end of the fiber, a processing unit, the inputs of which are connected to the outputs of the radiation detectors, is characterized in that, in order to expand its functionality, it is equipped with cross-flow streams from each of the internal 20 m additional parallel light edges of the defect (Fig. 3). In this case, one defect, represented by pulses on two radiation detectors 15, following through time T, is perceived as two from waters, the first and third of which are symmetrically located with respect to the second additional fiber, installed in the axicon plane so that effective defects. To eliminate such 5 input ends of the first and third possibilities and increase the reliability of control, the electronic part of the device works as follows. At the output of symmetric radiation receivers 15, voltage pulses arise, which are amplified by amplifiers 18 and 23, respectively. At the outputs of comparators 19 and 24, the inputs of which are connected to the outputs of the respective amplifiers, square-shaped pulses are formed, coinciding in time with the original light optical fibers and output end of the second additional fiber located in the axicon base plane and look like Rectangles, the long sides of which are parallel to the radius of the axicon base, the inputs and output ends of the first and third additional optical fibers are in the form D- rectangular sections, the entrance end of the second additional fiber is installed perpendicularly the optical axis of the laser, more pulses. Rear edge of the pulse, arising with a focusing cylindrical lens, about 40 the output of the comparator 19 (FIG. 2) starts the waiting multivibrator 26, which produces a negative polarity pulse, the duration of which T is equal to the maximum possible time between the two original pulses arising from one defect. The pulse from the output of the comparator 19 is delayed by the integrating circuit 20 (RICI) and then inverted by the inverter 21. The pulse generated at the output of the comparator 24, the inverted. is inverted by the inverter 25. Then the pulses from the outputs of the inverters 21 and 25 and the standby multivibrator 26 are fed to the inputs of the element 22 I. If the time between the initial pulses | 1 is less than T, the output of which is parallel to the radius of the axicon base is set to the output end of the second one fiber optic block.m of the laser beam displaced between the laser and the input end of the second additional fiber, a position sensor, the output of which is connected to the electrical input of the laser beam moving unit, 2 / And add by radiation receivers installed on the respective sections of the output ends of the first and third additional optical fibers, M identical measuring channels, each of which contains serially connected first amplifier, input-. which is the first step. And 22 a single impulse arises at the input of the corresponding measuring polarity, the front front, the first comparator, integrating which coincides with the front end of the chain, the first inverter and three-input pulse from amplifier 18, and the back front is an AND element, the output of which is the output the corresponding measuring channel, connected in series with the second usi / wc pulse-back edge with amplifier 23 (Fig. 3a). If the time between the original pulses greater than T, at the output of element 55, the tel, whose input is the second inlet 22, produces two pulses of positive polarity (Fig. 3b), i.e. The processing unit 16 registers with two the unenviable corresponding measuring channel, the second comparator and the second inverter, the output of which is associated with the third defective defect. The value of T is determined individually for each part 8 experimentally and depends, as a rule, on the parameters of the ensemble of defects inherent in a given processing technology. Invention Formula A device for controlling the quality of the surface of cylindrical holes, containing an optically coupled laser, focusing lens, axicon mounted apex in front of the laser radiation, a light guide whose input and output ends are made in the form of N ring sections and N radiation detectors, each with an output section the end of the fiber, the processing unit, the inputs of which are connected to the outputs of the radiation receivers, characterized in that, in order to extend the functionality, it is equipped with the first and third of oryh arranged symmetrically with respect to a second additional fiber, installed in the axicon plane such that the plane  The 5 input ends of the first and third additional fibers and the output end of the second additional fiber are located in the plane of the axicon base and look like Rectangles, the long sides of which are parallel to the radius of the axicon base, the input and output ends of the first and third additional fibers are in the form of A- rectangular sections, the input end of the second additional fiber is installed perpendicular to the optical axis of the laser, 0 which is parallel to the radius of the axicon base and which is installed on the output end of the second optical fiber receiver, a block of laser beam displacement between the laser and the input second face of the second additional fiber, the position sensor, the output of which is connected to the electrical input of the laser beam displacing unit , 2 / And additional radiation detectors installed on the corresponding sections of the output ends of the first and third additional light guides, M identical measuring channels, each of which contains serially connected first the house of the corresponding measuring channel, the second comparator and the second inverter, whose output is connected with the third input of the three-input element And, the waiting multivibrator, whose input is connected with the output of the first comparator, the output with the second input of the three-input element And, the processing unit is equipped with M additional inputs, each of which is connected with the output of a corresponding measuring canal A-A5-5 (Rig.2 The first and second inputs of which are connected to the outputs of additional radiation detectors mounted on the rectangular sections of the output ends of the first and third additional optical fibers, which are symmetrical with respect to the second additional optical fiber. e-b ig.Z 9g 9