» PCB & ASSEMBLY system
» PCB & ASSEMBLY system is adequate. But if very fast, highresolution photos of substrate parts are needed, a CCD camera would be required. Both cameras function by taking a picture of a part on the substrate, and then applying any necessary offsets by adjusting the dispensing program to match the location and shape of the path with the location and shape of the part. More specifically, the camera verifies the location of a part by identifying a distinguishing edge of the part that can be referenced. That reference point will allow the dispensing software to offset fluid dispensing if that point changes location – such as if the substrate registration is slightly displaced when positioned in the robot – and allows it to apply that offset change to where the dispensing is now to be placed on the substrate. Pencil cameras and CCD cameras both convert analog camera image pixels into digital values for extremely precise image management. Some relatively inexpensive pencil camera systems, combined with specialized dispensing software, such as those offered by Nordson EFD on its 3-Axis EV Series Automated Fluid Dispensing Robot, allow even first-time users to program complex dispense patterns and arrays with high repeatability up to +/- 8 μm (0.008 mm). Comparatively, CCD cameras capture even higher-definition images, such as that offered by Nordson EFD on its 3-Axis PRO Series Automated Fluid Dispensing Robot, which captures detailed component part images, where shadow enhancement allows vision identification and processing of poor, faint marks, with minimal time interruptions to the dispensing cycle. Its shutter rapidly captures high-contrast part images – eliminating blurriness and small distortions found in rolling shutter systems. When paired with intuitive dispensing software and a closed-loop motion control system, the CCD camera enables the PRO Series to achieve best-in-class repeatability of +/- 3 μm (0.003 mm). This series also permits a laser heightsensing capability to be added on. Laser height-sensing allows it to map the topography of the substrate and pass those measurements back to the robot so that it can automatically offset the Z-axis values and maintain the correct dispense gap over the substrate. The process occurs in real time for every part that runs using this feature – ensuring high-quality dispense outcomes, even on warped or twisted substrates. These fully integrated, smart vision CCD cameras for robotic fluid dispensing provide true three-dimensional motion control. The robots then have three types of feedback when the CCD, tip-detect device and laserheight sensor are installed – optical, contact and non-contact laser-height sensing – which allows for easy programming of dots, lines, circles, arcs, compound arcs and complex patterns. The tip-detect device changes the offsets to the program if a tip changes on the syringe or valve. Zusammenfassung Durch Bildverarbeitungs-gesteuerte Systeme liefern Robotersysteme schnellere Produktionszyklen beim Dosierprozess, minimieren die Programmierzeit und senken die Gesamtbetriebskosten. Résumé Grâce à des systèmes pilotés par traitement de l‘image, les systèmes robotisés permettent des cycles de production plus rapides dans le processus de dosage, minimisent le temps de programmation et réduisent les coûts opérationnels. Резюме Благодаря системам, управляемым зрением, роботизированные системы обеспечивают более быстрые производственные циклы в процессе дозирования, минимизируя время программирования и снижая общую стоимость владения. Advanced vision-guided dispense software Enabling this ultra-precise, high-speed simple-vision and CCD-equipped vision capability found in these latest-generation robotic fluid-dispensing systems is advanced vision-guided software. Such software programs, like DispenseMotion from Nordson EFD, enable the full capabilities of vision-guided fluid dispensing to be realized from these robotic systems. One of the most distinguishing aspects of this software’s integrated functionality is its precision in the control and management of the critical offsetting capability, whereby it compares the current workpiece location to a reference location that is stored as an image file within the program. When the robot detects a difference in the X and Y positions and/or the angle of rotation of the workpiece, it is this software that automatically adjusts the dispensing path to correct the difference. The offsetting function is constantly receiving process data to ensure that the dispensing process is executed with precise control. Simplicity and ease-of-use 40 EPP Europe » 11 | 2021
always being a vital aspect with system operators – despite this software’s advanced dispensing capabilities, its intuitive interface simplifies set up, and facilitates programming with an on-screen preview of the dispensing path. Tasks of importing and converting DXF files are equally simple. Recently, a Robot Initial Setup Wizard was added to DispenseMotion making the dispensing robots even easier to use by visually steering operators through each step of the setup process, including the calibration and setting of offsets in the simplest way possible. Source: Nordson EFD CCD smart cameras, with shadow enhancement, capture high definition images without interrupting fluid dispensing Streamlined robotic fluid dispensing These latest-generation fluid dispensing robot systems – exemplified in Nordson EFD’s GV, RV, EV and PRO Series models for 3-axes and 4-axes applications – with their advanced software and visionguided capability, bring repeatability and precision to automated dispensing systems and assembly operations. Ideal for dots, lines, potting, damming, filling, underfilling, encapsulation, sealing, coating and jetting – syringe-based and valve-based, for a wide range of applications, from inline to batch dispensing – they offer sophisticated fluid dispensing capabilities, more accurate placement, and greater consistency, while remaining simple and intuitive to program. This integration of robots with advanced dispensing software and vision, has considerable benefits for manufacturers, including greater part production capacity, reduced manufacturing time, consistent accuracy over rough and uneven surfaces, improved product quality, and the ability to take on more complex projects that require very precise dispensing and fluid placement. ‹ 3D measurement capability at the highest state of the art ‹ Side-View camera solutions for expanded inspection capabilities ‹ Auto programming based on Koh Young Europe GmbH Industriegebiet Süd E4 63755 Alzenau Tel. +49 (0)6188 9935663 E-mail: europe@kohyoung.com www.kohyoung.com EPP Europe » 11 | 2021 41
