PCB News - Quick look! PCBA processing process

Quick look! PCBA processing process

Printed circuit boards, various integrated circuits and electronic components are the working raw materials of the PCBA production line. These raw materials can accurately place the integrated circuits and electronic components we need through the production line and weld them on the printed circuit board to become computers, color TVs, The main board of the communication device. And the main content of this article is to introduce the PCBA processing process to readers, so that you in front of the screen will have a simple but specific understanding of the main steps of the PCBA processing process, let's take a look!

The first step: solder paste printing
The squeegee advances the solder paste along the surface of the template. When the solder paste reaches an opening area of the template, the downward pressure exerted by the squeegee forces the solder paste to pass through the opening area of the template and fall onto the circuit board.

Step 2: Apply adhesive
Optional process. In order to prevent the bottom surface mounting component during wave soldering or the bottom large integrated circuit component from melting and falling during double-sided reflow soldering, the double-sided assembly circuit boardneeds to be glued to the component.

The third step: component placement

This process is to use an automated placement machine to pick up the surface mount components from the feeder and accurately mount them on the printed circuit board.

Step 4: Inspection before and after welding
Before the components are reflow soldered, it is necessary to carefully check whether the components are well mounted and whether the position is offset or not.

Step 5: Reflow soldering
After the component is placed on the solder, the solder on the pad is melted by the flow soldering process of thermal convection technology to form the mechanical and electrical interconnection between the component lead and the pad.

The sixth step: component insertion
For through-hole plug-in components and surface-mount components that cannot be mounted on certain machines, such as plug-in electrolytic capacitors, connectors, button switches, and metal terminal electrode components (MELF), manual plug-in or use Automatic insertion equipment for component insertion.

Step 7: Wave soldering
Wave soldering is mainly used to solder through-hole plug-in components.

Step 8: Cleaning
Step 9: Repair
This is an off-line process whose purpose is to economically repair defective solder joints or replace defective components.
Step 10: Electrical test
Electrical testing mainly includes online testing and functional testing.
Step 11: Quality Management
Quality management includes quality control in the production line and product quality assurance before delivery to customers.
The twelfth step: packaging and sampling inspection
The last step is to pack the components and conduct sampling inspections after packaging to again ensure the high quality of the products that will be delivered to customers.

The motherboard is the core component of technological electronic products, and the normal operation of all functions is closely related to it. This is just a brief description of the PCBA processing process. If it is to be subdivided and expanded, the process is not so simple. I hope this article can more or less help you understand the PCBA process, and it can also uncover more mysteries about PCBA.