SMT Automatic Optic PCB Inspection Offline AOI machine in SMT Production Line
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Offline automatic aoi optical inspection equipment is the general term for AOI after reflow soldering and AOI after wave soldering. After SMD parts are mounted on the surface mount PCBA production line, or after soldering, the electrolytic capacitor polarity test function automatically detects the attachment of the parts. In addition, it provides various statistical data on the production process to accurately understand the cause and content of the defect, thereby improving production efficiency. aoi automatic optical detector_A good helper to improve the yield.
Automatic aoi optical inspection equipment, also known as AOI optical tester, AOI automatic optical tester, aoi optical tester, is to automatically test the polarity of electrolytic capacitors after SMD parts are mounted on the surface mount PCBA production line, or after soldering. Detect the mounting status and soldering state of the parts, and detect the defects of PCBA soldering. In addition, various statistical data in the production process are provided to accurately understand the reasons and contents of the defects, thereby improving production efficiency. aoi automatic optical detector_a good helper to improve the yield
With the reduction of device package size and the increase of circuit board patch density, SMD inspection becomes more and more difficult, and manual visual inspection appears to be inadequate. Its stability and reliability are difficult to meet the needs of production and quality control, so special It is more and more important for AOI inspection instrument to realize automatic detection. The first instrument used in production is an optical system. This type of instrument has a common feature that collects and calculates the reflected light of SMA through a light source, and is processed by a computer image processing system to determine the position of the components on the SMA and the welding situation. So this type of equipment is called For automatic optical inspection (Automated Optical Inspection, AOI for short) AOI optical inspection equipment is divided into two categories: online AOI automatic optical inspection instrument, offline aoi automatic optical inspection instrument.
AOI equipment is usually divided into three types according to the position on the assembly line: the first is the AOI that is used to detect solder paste failure after screen printing, called AOI after screen printing; the second is to detect the device after placement AOI for mounting failures is called post-mounting AOI; the third type is AOI that detects component mounting and soldering failures at the same time after reflow AOI and wave soldering AOI, called post-reflow AOI, offline automatic aoi optics Testing Equipment.
The failure detection capabilities and principles of the above-mentioned offline automatic aoi optical inspection equipment will be introduced below.
Offline automatic aoi optical inspection equipment is the general term for AOI after reflow soldering and AOI after wave soldering
The AOI at this station can be used to detect various welding defects (including patch defects) after the components are welded. The test principle is that there is a relationship of WA=бlg(1+cosθ) between the welding strength WA and the wetting angle θ between the solder/component pins, that is, the welding strength of the solder can be inferred from the wetted state of the solder. The image taken by the camera is composed of many pixels, and each pixel has a certain gray value (0～255). Therefore, the image information processing through a certain mathematical model can accurately determine the welding quality. It can detect missing parts, offset, skew, tombstones, side standing, overturned parts, wrong parts, OCV, breakage, capacitor polarity reversal, excessive tin, little tin, solder joint, tin connection, copper foil pollution, etc.