PCB assembly used to be a manual process that required tweezers and solder paste. Machines have improved the process tremendously. While humans can work fast and efficiently, fatigue can start setting in after several hours. In addition, machines are able to work around the clock, unlike humans. So, how can PCB assembly become more efficient? Read on to find out. Here are some of the benefits of yyfab machines.
Typical substrates
The industry has evolved over time to utilize a variety of different substrates for PCB assembly. While fiberglass is still the most common substrate used today, other materials are emerging. Fiberglass is affordable, reliable, and provides a stable foundation for the PCB. However, the material used to construct the PCB substrate can have a significant impact on its performance. This article will discuss some of the more common substrate materials used for PCB assembly.
Typical solder paste
Typical solder paste is used in the construction of PCB circuit boards. It is produced using two separate design files: the Top Paste (.GTP) and Bottom Paste (.GBP). Initially, copper and iron were used as stencils. Now, stainless steel is being used. There are several types of stencils for PCB assembly, depending on their thickness, number of nozzles, and production process. Depending on the requirements, the thickness of the stencil determines the paste density.
Typical solder paste thickness
The typical solder paste thickness for a yyfab is determined by the design and apertures of the stencil. The thickness of solder paste is important for a high-yield assembly process, because low thickness results in tomb-stoning, balling, and other defects. Too much solder paste compromises the electrical functionality of a board. Typically, a stencil is between four and eight thou thick.
Typical solder paste color
Solder paste is a conductive compound that fills tiny gaps between components and provides a medium for heat to flow. It flows from the soldering iron to the metal component and is composed of different types of metal alloys, fluxes, and solvents. This paste is usually thick and sticky and serves as an attachment medium for the components. It should be stored at temperatures around 77°F and below.
Typical solder paste application
The process of applying solder paste to a PCB is straightforward, but the process is slow for large-scale manufacturing. In the factory, solder paste is applied using a stencil that has minute apertures for the surface mount components. The process requires clean assembly environments and the proper solder paste application. Here’s a look at the https://yyfab.com/ most common methods of solder paste application.
Typical solder paste inspection
There are several methods for solder paste inspection. Laser measurement is the most common method for this purpose. It uses two laser beams scanned from opposite directions, avoiding shadowing and other problems. The two laser beams pass through the PCB and are reflected back to a high-resolution camera. The camera measures the volume of solder paste, the alignment, and the height of the printed components. It is also possible to use an angled camera for this purpose.
Typical solder paste inspection results
Typical solder paste inspection results for PC Board assembly can be used to evaluate the quality of the solder paste deposit on the PCB. In fact, solder printing is the primary cause of many defects in the PCB assembly process. Solder paste deposition is crucial for the proper electrical connection of a PCB. Therefore, it is essential to inspect the PCB prior to component pick-and-place.
