3D – DS SENZORPRECISE ANALYSIS IN 3D
- Control and measurement in 3D: volume, height, tilt, OCR, ..
- Results in real units (mm): calibrated accuracy in the order of microns
- Contrast independent control
The DS1000 and DS925 laser 3D scanners are compact, autonomous and calibrated systems that allow measurements in real units in the order of microns.
3D scanners work on the principle of so-called triangulation. The projection of laser lines onto the body of the object and their scanning by the camera provides data that creates the topography of the scanned objects.
Unlike classical 2D vision, 3D scanner measurements are not burdened by problematic characteristics of the examined object, such as a glossy surface of the product, weak contrast in the changes on the surface of the product or independence of colour.
Scanners are used where precise measurement of the object is needed, such as when checking the position of the pins on the connectors, checking the soldered connections or the parts on the printed circuit boards.
The scanners come with Cognex Designer software and a VC5 controller.
OVERVIEW OF MODELS
| DS1050 | DS1101 | DS1300 | DS910B | DS925B | |
| Near Field of View (mm) | 43 | 64 | 90 | 9,4 | 23,4 |
| Far Field of View (mm) | 79 | 162 | 410 | 10,7 | 29,1 |
| Clearance Distance (mm) | 87 | 135 | 180 | 52,5 | 53,5 |
| Measurement Range (mm) | 76 | 220 | 725 | 8 | 25 |
| Laser Class | 2M | 2M | 2M | 2M | 2M |
| Resolution X (mm) | 0.059 - 0.090 | 0.079 – 0.181 | 0.101 – 0.457 | 0.0073–0.0084 | 0.0183–0.0227 |
| Resolution Z (mm) | 0.004 - 0.014 | 0.010 - 0.052 | 0.016 - 0.265 | 0.001 | 0.002 |
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CONTROL OF LOCATION AND VOLUME OF HEAT-CONDUCTIVE AND ELECTRO-CONDUCTIVE ADHESIVE ON BASEPLATE
The first check is based on the detection of a correctly pressed piece, the measured plane of the bottom of the piece is compared with the stored reference plane and a decision is made as to whether the aluminum body is correctly pressed onto the connectors. At the first point of the plane, the measured parameters are displayed in the form: [absolute difference of the angle of the normal vectors of the planes in °; absolute difference of plane offsets in mm].
On both connectors, a plane is created using points in 3D space at four locations on the connector. The plane of the connectors is compared with the plane of the bottom of the piece and a decision is made as to whether the connectors are in the correct position. At the first point of the connector, the measured parameters of the plane are displayed in the form: [absolute difference of the angle of the normal vectors of the planes in °; absolute difference of plane offsets in mm].
The Cognex DS1050 scanner allows precise analysis of the distribution and volume of drops of heat-conducting and electro-conductive adhesive applied to the product housing. The scanner is located on the servo drive and connected to its incremental sensor. The figures below represent the 3D data as displayed on the line operator panel (HMI).
The main regions for searching for drops are set in the program according to the customer's drawing. Within these regions, any area above the bottom of the piece is sought. A more accurate region is made around this area, in which the exact position of the drop in 2D is measured as the centre of gravity of the object. Then the volume of this object above the bottom plane is also measured. The object that forms the drop must meet the condition of compactness. Ie. its normalized compactness (normalized compactness for a circle is 1) must be greater than specified. The blue cross indicates the assumed drawing position of the drop. The green / red cross indicates the found position of the drop, and the colour indicates the correct position of the drop. For each drop, the text is displayed in the form: B + Drop index [drop eccentricity in mm; drop volume in mm3; normalized droplet compactness]. The colour of the text next to the drop represents the global result of its check.
In circular regions (forbidden areas), the absence of adhesive is evaluated. The information text is in the form: F + Area index [area volume in mm3].
The measurement of the permeability of the channels, i.e. the absence of glue in them, consists in measuring the volume of the channel below the plane of the bottom. Each region approximating the channel area is divided into several sub regions so that their length is about 1 mm. In these sub-regions, the volume below the bottom plane is measured and evaluated. If a sub region has the wrong volume, it is drawn in red with text in the form: [volume of the sub region in mm3 per mm of length]. If the measurement of the whole channel is OK, then an information text is displayed for it in the form: C + Channel index [minimum volume of the sub region in mm3 related to one mm of length; maximum volume of the sub region in mm3 per mm of length].
ACQUIRED UNCLEANED 3D DATA OBTAINED FROM THE SCANNER.
On both connectors, a plane is created using points in 3D space at four locations on the connector. The plane of the connectors is compared with the plane of the bottom of the piece and a decision is made as to whether the connectors are in the correct position. At the first point of the connector, the measured parameters of the plane are displayed in the form: [absolute difference of the angle of the normal vectors of the planes in °; absolute difference of plane offsets in mm].
INSPECTION OF SEALING AND PUTTY IN GROOVE- SCANNING USING THE DS925 SCANNER
The Cognex DS925 3D scanner technology was chosen to measure the height of the adhesive in the groove. The scanner is placed on a Staubli TS20 robot in order to remove vignetting (shading) in the arcuate parts of the product. This guarantees the reliability of detection around the entire perimeter of the product. 3D scanners of the "DS" series achieve a system resolution in the order of micrometers. Typical applications for their use include detection of height, edge, angle, profile, gap, flatness and the like.
