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4 years ago

EPP Europe P1.2020

  • Text
  • Assuraance
  • Test
  • Production
  • Assembly
  • Packaging
  • Printing
  • Process
  • Technologies
  • Automation
  • Manufacturing

COVER Planar computed

COVER Planar computed tomography gives a seamless FOV. Source: Saki Corporation Automatic warpage compensation Robust warpage compensation is an essential function for accurate height reconstruction. Usually, an inspection tool, such as a laser, is used and the inspection machine has to be manually programmed with the exact location on the PCB where surface height is to be measured. This results in additional programming time and program optimization, and warpage of the surface underneath a covered surface is unknown. The company’s AXI system can automatically inspect the pad layer, measure warpage height, and automatically perform warpage compensation anywhere on the product. Head-in-pillow inspection algorithm Head-in-pillow (HiP) is a defect of the solder joint caused by the failure of the solder ball and the PCB pad to melt together and form a seamless mechanical connection during the reflow process. The solder joint will exhibit electrical integrity, but it will fail under mechanical or thermal stress. It is called head-in-pillow because it looks like a head pressed into a soft pillow. Defects have countless variations of their shapes, and to identify defective shapes is very difficult in HiP inspection. 3D inspection is focused on recognizing fine shape deviations of the solder and then detecting an abnormality by comparing it to an ideal shape. Deep analysis of the solder shape under the ball grid array (BGA) requires lots of measurements of various parameters related to the area of slices through the solder ball, such as circularity, volume, etc. The ability to separate layers and collect volumetric data enables a 3D AXI system to conduct detailed inspection of such solder joints. Based on years of research from collected customer data, Saki has been able to identify the deviations and trends of what is considered acceptable and unacceptable solder ball shapes. After defining the shapes, they created an inspection log that was turned into a new algorithm that takes AXI capabilities to the next level. The algorithm unifies the various definitions of solder shape and incorporates them into one inspection step. It uses shape detection capability knowledge and combines it with highly sensitive and accurate 3D volumetric data to provide simple and easy parameter setting. This provides the ability to define the correct inspection parameters quickly and easily. Achieving zero escapes The number of escapes, or false passes, during production is a significant factor in judging inspection quality. An escape is a defect that isn’t discovered during test. Unfortunately, that defect is often overlooked and found by the customer when something fails. Having too many escapes is very costly to the assembly process in manufacturing time and money. If the defect is found during production, repair or replacement of the part is possible, but this slows down the line or the line has to be stopped. Throughput and yield are decreased. The later in the process that a defect is found, the more difficult and costly it is to fix it or adjust the line. The company’s 3Xi-M110 AXI system produces such high inspection quality and reliability that the inspection process results in zero escapes. X-ray tube addresses environmental concerns In any X-ray system, strict adherence to control and use of the X-rays is critical in the system’s operation. With reduction of X-ray exposure as its focus, the company implemented a brand new, closed X-ray tube. The tube of the 3Xi-M110 has a pulse mode capability to switch on and off the X-ray during high speeds. Seventy percent X-ray dose reduction is possible by powering on the X-ray only at the moment of image capture and powering it off while waiting Zusammenfassung Inline 3D-Röntgensysteme kommt bei der Qualitätssicherung eine Schlüsselrolle zu, insbesondere für kritische Anwendungen, da sie eine präzise und schnelle volumetrische 3D-Inspektion ermöglichen. Résumé Les systèmes de radiologie 3D en ligne jouent un rôle crucial dans l’assurance de qualité, en particulier pour les applications critiques, car ils permettent de réaliser une inspection précise et rapide en trois dimensions. Резюме Встроенные рентгеновские 3D-системы играют ключевую роль в обеспечении качества, особенно в критически важных областях применения, так как они позволяют проводить точный и быстрый объемный 3D-контроль. 24 EPP EUROPE April 2020

COVER for the board to be loaded. Moreover, conventional closed tubes must be turned on/off periodically, even when kept as a spare part to prevent deterioration of the tube. This is a costly and time-consuming operation. When using the new 3Xi’s X-ray tube, a tube-lead-box is not necessary. The tube stays in the inspection position during PCB loading and unloading. As a safety feature and to control exposure levels during inspection, the software is equipped with a dose simulator. The user can monitor the radiation dosage and according to that information, the delivery method and magnification can be set. The tube does not require any periodical maintenance or storage of spare parts. The built-in lifetime monitoring system reports the time to replace the tube. The new tube cuts X-ray exposure of the product and inner machine parts in half, minimizing component damage, increasing the life of the detector, and dramatically decreasing the cost of ownership for the system. Source: Saki Corporation Source: Saki Corporation Head-in-pillow defects. Further improvements for production quality control and Industry 4.0 Saki’s total inspection lineup uses the same software and hardware platforms. Together with X-ray, the company offers fast and accurate 3D SPI, 3D AOI, and bottom-side inspection during the printing, prereflow, and post-reflow processes. Each inspection process provides its own inspection result data. Their multi-process view (MPV) software shows inspection results from all processes in one place in real time, which enables the operator to analyze and make process corrections based on the inspection results from the previous process. Immediately, together with Saki’s advanced SPC and report function, MPV provides a more comprehensive perspective of the defect analysis for the entire process and serves as a key to improved production quality. www.sakiglobal.com Backend automated assembly line. EPP EUROPE April 2020 25