PCB Tech - PCB board dissection and selection method

PCB board cutting is an important content in PCB design

PCB board cutting is an important content in PCB design. However, many designers are reluctant to engage in this work due to the sandpaper grinding plate (a hazardous type of work) and line drawing (a simple repetitive work). Even many designers think that PCB cutting is not a technical job, and junior designers can do this job with a little training.

This concept has a certain generality, but just like many works, there are still some parts of the PCB board. If the designer masters these, it can save a lot of time and greatly reduce the amount of labor.

The concept of PCB board cutting

PCB board cutting refers to the process of obtaining the schematic diagram and board diagram (PCB diagram) based on the original PCB board. Its purpose is to carry out later development. Later development includes installation of components, deep testing, circuit modification, etc. Because it does not belong to the category of PCB board cutting and is related to it, only the introduction will not be detailed.

PCB board cutting process

1. Remove the components on the original board.

2. Scan the original board to get the graphic file.

3. Grind off the surface layer to obtain the intermediate layer.

4. Scan the middle layer to get the graphic file.

5. Repeat steps 2-4 until all layers are processed.

6. Use special software to convert graphics files into electrical relationship files---PCB diagrams. If you have the right software, the designer only needs to trace the graphics once.

7. Check to complete the design.

The cutting of PCB boards, especially the cutting of multi-layer PCB boards, is a time-consuming and laborious work, which contains a lot of repetitive labor. The designer must have enough patience and care, otherwise it is very easy to make mistakes. The key to a good cut PCB design is to use appropriate software to replace manual repetitive work, which saves time and is accurate.

1. A scanner must be used during the cutting process.

Many designers are used to drawing lines directly on PCB design systems such as PROTEL, PADSOR or CAD. This habit is very bad. The scanned graphic file is not only the basis for conversion into PCB file, but also the basis for later inspection. The use of scanners can greatly reduce labor difficulty and intensity. It is no exaggeration to say that if you can make full use of the scanner, even people with no design experience can complete the PCB board cutting work.

2. Grinding the plate in one direction.

In order to pursue speed, some designers choose two-way grinding plate (that is, grinding away the plate layer from the front and rear surfaces to the middle layer). In fact, this is very wrong. Because the two-way grinding plate is very easy to wear through, causing other layers to be damaged, the result can be imagined. The outer layer of the PCB board is hard due to the process, copper foil, pads, etc., and the middle layer is soft. Therefore, in the middle layer, the problem is more serious and often cannot be polished. In addition, the materials, hardness, and elasticity of PCB boards produced by various manufacturers are different, and it is difficult to accurately grind them.

How to choose a suitable PCB board rapid proofing manufacturer

For PCB proofing users, how to choose a PCB board fast proofing manufacturer that can realize their design needs is a headache. Too much information will affect their judgment. Here are a few important points to share with you how to choose a suitable PCB proofing factory.

1. Excellent production technology

Try to choose PCB proofing manufacturers with diversified processes, such as immersion gold process, lead spray tin, etc., to ensure the quality of the circuit board.

2. Strict quality supervision system

Unlike other products, PCB circuit boards require high production accuracy. If the proofing manufacturer has a strict supervision and management system, such as IQC raw material inspection management, OQC shipment test inspection, QE inspection standards and QA quality assurance, it indicates that the product quality is high. It is worth choosing.

3. Higher yield

Manufacturers with high yields indicate their advanced production equipment and the ability to produce high-quality PCB prototypes.

4. Intimate after-sales service

After-sales service is an important factor in testing the quality of manufacturers. Try to choose PCBproofing manufacturers with perfect after-sales systems and strong after-sales guarantees.

5. Is there too much?

If there are too many negative news in the industry, it means that the user recognition is not high and the brand reputation is not good.

6. Whether you have a successful big brand case

If so, it means that the manufacturer has rich industry experience and is worth choosing.

Knowing the above 6 selection criteria, you can initially select a suitable PCB board rapid proofing manufacturer.