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Usually the produced PCB board needs to be processed by the board manufacturer. After the proofing is completed, the technician will solder the components, and finally assemble it into the shell and package to form a complete product. So what relevant parameters and instructions need to be provided for PCB proofing?
[Explanation items for PCB proofing]
Material: The first thing to explain is what kind of material is needed for the PCB. At present, FR4 is the most common, and the main material is epoxy resin peeled fiber cloth board.
Board layer: to explain the number of layers you make the PCB board. (The number of production layers of the PCB board is different, and the price will be different, and the proofing process of the PCB circuit board is similar.)
Solder mask color: There are many colors, you can also choose according to company requirements, generally green.
Silkscreen color: The color of the font and border of the silkscreen on the PCB is generally white.
Copper thickness: Generally, the copper thickness is scientifically calculated based on the current of the PCB circuit. Generally, the thicker the better, but the cost will be higher, so a reasonable balance is required.
Whether the via is covered with solder mask: Over solder mask is to insulate the via, otherwise it is to make the via uninsulated.
Surface coating: spray tin and gold plating.
Quantity: The quantity of PCB produced should be clearly stated
What is PCB proofing and what does PCB proofing mean
What is PCB proofing
PCB proofing generally means that after the engineer’s PCB layout design is completed, the electronic product is sent to the PCB manufacturer to be processed into a PCB for trial production.
The update iteration of electronic products is relatively fast, so the demand for PCB proofing is gradually growing, and the market share is constantly expanding. As the process requirements of electronic products are getting higher and higher, the information becomes more and more high-speed, leading to multi-layer PCB proofing The rise is relatively fast.
What are the user groups for PCB proofing
Mainly mainly electronic engineers, there are also student groups for academic research, research institutes, etc.
How to choose the right PCB proofing manufacturer
Mainly pay attention to several links:
1. Choosing large companies and large enterprises will have a more secure relative strength and a more regularized management.
2. Choose Shenzhen's surrounding enterprises, a leading place for electronic products, and complete supporting facilities to ensure delivery.
3. Choose a company with a good reputation, focus on service, and have a good cultural theme.
PCB proofing process
1. Etching
Etching is to use a chemical reaction method to corrode the copper layer of non-circuit parts.
2. Green oil
Green oil is to transfer the graphic of the green oil film to the board to protect the circuit and prevent the tin on the circuit when welding parts.
Process: grinding plate-printing photosensitive green oil-curium plate-exposure-exposure; grinding plate-printing the first side-drying plate-printing the second side-drying plate
3. Characters
Characters are provided as a mark for easy identification
Process: After the green oil finishes - cool and stand - adjust the screen - print characters - rear curium
4. Gold-plated fingers
A layer of nickel/gold layer of required thickness is plated on the finger of the plug to make it more hard and wear-resistant
Process: upper plate - degreasing - washing twice - micro-etching - washing twice - pickling - copper plating - washing - nickel plating - washing - gold plating
2 Tin plate (a process in parallel)
Tin spraying is to spray a layer of lead tin on the bare copper surface that is not covered with solder mask to protect the copper surface from corrosion and oxidation to ensure good soldering performance.
Process: micro-erosion - air drying - preheating - rosin coating - solder coating - hot air leveling - air cooling - washing and air drying
5. Forming
The method of forming the shape required by the customer through die stamping or CNC gong machine. Organic gong, beer board, hand gong, hand cut
Note: The accuracy of the data gong machine board and the beer board is higher. The hand gong is second, and the minimum hand-cutting board can only make some simple shapes.
6. Test
Through the electronic 100% test, it can detect defects that affect functionality such as open circuits and short circuits that are not easy to find visually.
Process: upper mold - release board - test - pass - FQC visual inspection - unqualified - repair - return test - OK - REJ - scrap
7. Final inspection
Through 100% visual inspection of board appearance defects, and repair minor defects to avoid problems and defective boards from flowing out.
Specific work flow: incoming materials - view information - visual inspection - qualified - FQA spot check - qualified - packaging - unqualified - processing - inspection OK
