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pcb electronic from Introduction to PCB Assembly

18. Jul 2016 23:18, rigidflexpcb

Introduction to PCB Assembly Some of you may have heard of your term PCB Assembly and thought, "What's that"? This rigid flexible pcb article is meant to shed some light on the topic. The whole process of manufacturing electronic devices is often a lengthy and complex one particular. The beginning point for all electronics is in the material - Silicon or any other semiconductor. By means of a number of lengthy and highly-priced clean area processes, these "wafers" are transformed into "smart" electronic microprocessors and chips. These chips can not do anything by themselves, and have to be integrated onto a printed circuit board (PCB) as a way to be capable of do a thing in the end rigid flex pcb (like operate your computer or phone). Now, there are actually a sizable variety of organizations that style these chips and sell end-products. Nonetheless, these businesses can't afford to buy each of the equipment expected to assemble their chips onto PCBs as a way to devise their end-product. This really is what PCB Assembly businesses are for. These (EMS) companies have a number of Surface Mount Assembly lines, and offer PCB Assembly solutions to other organizations who are not serious about performing this themselves. The PCB Assembly method consists of numerous distinctive processes: 1) Solder Paste Printing - Through this method the initial solder paste is printed onto the PCB making use of a stencil. This is basically the binding material in the devices towards the PCB. 2) SMT Pick & Place Assembly - That is the heart of each PCB Assembly line. This process takes all the individual chips and accurately places them on their designated place on the PCB. 3) Reflow/Through-hole curing - After placing the chips onto the solder paste, the boards go through a conveyor oven to melt the solder and bind the chips towards the PCB. 4) Conformal Coating - Some boards require a protective lacquer coating. Conformal "Selective Coating" machines quickly and accurately provide a layer of protective coating on the PCBs. 5) AOI and AXI - Automatic Optical Inspection and Automated X-ray Inspection. These processes are key to confirming that no mistakes have been made in the course of the assembly method 6) Reworking if needed - If any mistakes or defects are found, some devices can be reworked. Reworking consists of heating the board or device, and removing it from the PCB so that a replacement can be placed in its stead. Each of these processes is usually a world in its own right and is considered a technology field in its own. You will find several specialist manufacturers for each with the thesePCB Assemblyfields.
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