SMT is the use of solder paste printing machine, SMD machine, reflow soldering and other professional automatic assembly equipment will be assembled on the surface of the components (type including resistors, capacitors, inductors, etc.) directly paste, soldered to the surface of the circuit board of a kind of electronic assembly technology, is currently the most popular in the electronics assembly industry, a kind of technology and process.
We use computers, cell phones, printers, MP4, digital imaging, high-tech control systems, etc. are produced using SMT equipment, is the core technology of modern electronics manufacturing.
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Extended Information:
. p>Features:
1 High assembly density, small size and light weight of electronic products, the volume and weight of the SMD components is only about 1/10 of the traditional plug-in components, and generally after the use of SMT, the volume of the electronic products is reduced by 40% to 60%, and the weight is reduced by 60% to 80%.
2 High reliability and vibration resistance. Low solder joint defect rate.
3 Good high frequency characteristics. Reduced electromagnetic and radio frequency interference.
4 Easy to automate and improve productivity. Reduce cost up to 30%~50%. Save material, energy, equipment, labor, time, etc.
Process:
Printing (or dispensing) --> Mounting --> (curing) --> Reflow soldering --> Cleaning --> Detection --> Reworking Printing: Its role is to leak the solder paste or patch adhesive printed to the PCB pads, in preparation for the welding of components. The equipment used for the printing machine (solder paste printing machine), located in the forefront of the SMT production line.
1 Dispensing: Because most of the circuit boards used now are double-sided patch, in order to prevent the second back to the furnace when the input side of the components due to the solder paste melt again and fall off, so the input side of the addition of dispensing machine, it is the glue drops to the fixed position of the PCB, and its main role is to fix the components to the PCB board.
The equipment used is the dispenser, which is located at the front end of the SMT production line or behind the testing equipment. Sometimes due to customer requirements to produce the surface also need to dispense, and now many small factories do not use dispenser, if the input surface components are larger with manual dispensing.
2 mounting: its role is to accurately install the surface assembly components to the PCB fixed position. The equipment used for the placement machine, located in the SMT production line in the back of the printing machine.
3 curing: its role is to melt the chip adhesive, so that the surface assembly components and PCB board firmly bonded together. The equipment used is a curing oven, located in the SMT production line behind the mounter.
4 reflow soldering: its role is to melt the solder paste, so that the surface assembly components and PCB board firmly bonded together. The equipment used is a reflow oven, located in the SMT production line behind the mounter.
5 cleaning: its role is to assemble the PCB board above the harmful welding residues such as flux removed. The equipment used for the cleaning machine, the location can not be fixed, can be online, or not online.
6 Detection: its role is to assemble a good PCB board for welding quality and assembly quality testing. The equipment used is a magnifying glass, microscope, online tester (ICT), flying pin tester, automatic optical inspection (AOI), X-RAY inspection system, function tester and so on. Location according to the needs of the test, can be configured in the production line in the appropriate place.
7 rework: its role is to detect the failure of the PCB board rework. The tools used for the soldering iron, rework workstations and so on. Configuration in any position in the production line.
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