SU1682771A1 - Device for determining the direction of machining traces on the article surface - Google Patents

Abstract

The invention relates to a measurement technique and can be used in the automated analysis of the position of parts in space, determining the direction and speed of their movement, finishing processing, etc. The aim of the invention is to increase the sensitivity and accuracy of determining the direction of processing traces by eliminating the error in determining the maximum diffraction component of the pattern of diffused reflected light. The device contains a laser 1 and a photomultiplier 3, coaxially with which the disk 4 is installed with two diametrically opposite slits 5 and 6, equipped with a rotating actuator 7 and a position angle sensor 8, and a screen 9 with a transparent sector 10 and a reflector 11, fixed on it in the center from the outside and optically coupled to the laser 1. 3 Il. U YO O SO SO YO NJ VI

Description

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The invention relates to a measuring technique and can be used in the automated analysis of the position of parts in space, determining the direction and speed of their movement, the end of processing, etc.

The purpose of the invention is to increase the sensitivity and accuracy of determination by eliminating the error in determining the maximum of the diffraction component of the pattern of reflected light scattering.

Fig. 1 is a schematic diagram of an apparatus for determining the direction of processing marks on the surface of parts; in fig. 2 - screen design with a transparent part in the form of a sector; Fig. 3 shows a diagram of the method for determining the processing direction, as well as the parameters that characterize this direction.

The device contains a laser 1 mounted on the housing 2, a photomultiplier (PMT) 3, coaxially with which disks 4 are installed in series with two diametrically opposite slits 5 and 6, equipped with a rotational drive 7 and a position angle sensor 8, and a screen 9 transparent sector 10 and the reflector 11, mounted on the screen 9 in the center from the outside. The reflector 11 is optically coupled through the auxiliary prism 12 to the laser 1. The PMT 3 is installed in the housing 2 and electrically connected to the amplifier 13, the output of which, in turn, is connected to the input of the recording unit 14. The surface 15 is perpendicular to the axis of the disk 4.

The device works as follows.

During operation, the laser beam 1 through the auxiliary prism 12 and the reflector 11 hits the surface under study 15. In this case, a trace appears on screen 9 from the beam diffraction on the tracks from the processing of the surface under study 15. The light from the diffraction is a band symmetrical about the axis of rotation of the disk 4 The diffraction component of the pattern of diffused reflected light passes through the transparent sector 10 of screen 9 onto the disk 4. When the disk 4 is driven by the actuator 7, a periodic coincidence occurs (twice

one turn) of the slit with a diffraction pattern. At this moment, the PMT 3 registers the radiation maximum and, through the amplifier 13, outputs a signal to the recording unit 14, at which simultaneously

signal is received from the position angle sensor 8. Sensor 8 converts the electrical signal to an angular value relative to the received coordinate system. So, if p is the angle between the diffraction plane A-A of the surface 15 and the X axis, then the angle y will determine the processing direction (Fig. 3). To increase the scan area, the diameter of the photocathode of the PMT 3 is chosen equal to the diameter of the disk 4. The disk 4 with two narrow slits makes it possible to interrogate the entire transparent part of the screen 9 continuously, because when operating in automatic mode, the picture of the surface being surveyed on the screen 9 is all

time varies.

The use of a PMT 3 in combination with disk 4 makes it possible to determine the processing traces with respect to the device’s coordinate system.

Claims (1)

Apparatus of the Invention A device for determining the direction of processing marks on a part surface, comprising a laser and a photodetector, characterized in that, in order to increase the sensitivity and accuracy of determination, it is equipped with successively coaxially mounted with a photo-receiver, a disk with two diametrically opposite slits and a screen with a transparent sector, a reflector mounted on the screen at its center from the outside and optically connected with laser, disk rotation drive and angle position sensor disk, and the photodetector is made in the form of a photomultiplier tube.