SMT surface mount welding typical process flow
1. Template: Firstly, process the template according to the designed PCB. General templates are divided into chemical corrosion (also known as etching) copper templates or stainless steel templates (low price, suitable for small batch, test and chip pin spacing >0.65mm); Laser cutting stainless steel template (high precision, high price, suitable for large quantities, automatic production line and 0.3mm≤ chip pin spacing ≤0.5mm).
Release Date:
2023-05-05
1. Template: Firstly, process the template according to the designed PCB. General templates are divided into chemical corrosion (also known as etching) copper templates or stainless steel templates (low price, suitable for small batch, test and chip pin spacing >0.65mm); Laser cutting stainless steel template (high precision, high price, suitable for large quantities, automatic production line and 0.3mm≤ chip pin spacing ≤0.5mm).
SMT process and equipment introduction:
1. Template: Firstly, process the template according to the designed PCB. General templates are divided into chemical corrosion (also known as etching) copper templates or stainless steel templates (low price, suitable for small batch, test and chip pin spacing >0.65mm); Laser cutting stainless steel template (high precision, high price, suitable for large quantities, automatic production line and 0.3mm≤ chip pin spacing ≤0.5mm).
2. Printing leakage: its function is to use a scraper to print solder paste on the PCB pad, for the preliminary preparation of the installation of components. The equipment used is screen printing machine (automatic, semi-automatic screen printing machine) or manual screen printing table, scraper (stainless steel or rubber), located at the front of the SMT line.
3. Mounting: Its function is to accurately install the surface mounting components to the fixed position of PCB. The equipment used is SMT machine (automatic, semi-automatic or manual), vacuum pen or special tweezers, located behind the screen printing machine in the SMT line.
4. Reflow welding: its function is to melt the solder paste, so that the surface mounted components and PCB firmly welded together to achieve the electrical performance required by the design and fully in accordance with the international standard curve precision control. The equipment used is reflow welder (automatic infrared/hot air reflow welder), which is located behind the SMT machine in the SMT line.
5. Cleaning: Its function is to remove the substances that affect electrical properties or welding residues that are harmful to human body on the mounted PCB, such as flux, if the use of non-cleaning solder generally can not be cleaned. The cleaning equipment is ultrasonic cleaning machine and special cleaning liquid cleaning, the position can not be fixed, can be online, or not online.
6. Detection: Its function is to test the assembly quality and welding quality of the mounted PCB. The equipment used includes magnifying glass, microscope, online tester (ICT), flying needle tester, automatic optical tester (AOI), X-RAY testing system, function tester, etc. Location According to the inspection needs, the configuration of the production line in the appropriate place.
7. Repair: Its function is to rework and repair the PCB that fails to detect. The tools used are soldering iron, repair workstation, etc. At the same time, the reflow welding machine of our company (model QHL320A) can be used for setting and repair without damage. Configuration anywhere in the production line.
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Dongguan Guo Hao Electronic Equipment Co.,ltd.
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