Explain the whole process of PCB circuit board production (double-sided)?

PCB (Printed Circuit Board), the Chinese name is printed circuit board , also known as printed circuit board , is an important electronic component, a support body for electronic components, and a carrier for electrical connection of electronic components. Because it is made using electronic printing, it is called a "printed" circuit board.

The role of PCB

After the electronic equipment adopts the printed board, due to the consistency of the same type of printed board, the error of manual wiring is avoided, and the automatic insertion or mounting of electronic components, automatic soldering, and automatic detection can be realized, which ensures the quality of the electronic equipment. , improve labor productivity, reduce costs, and facilitate maintenance.

PCB circuit board production process flow

1. Contact the manufacturer

First, you need to contact the manufacturer, then register the customer number, and someone will quote you, place an order, and follow up the production progress. For example, you can directly contact Xu Sheng: 13215144678

2. Opening

Purpose: According to the requirements of the engineering data MI, on the large sheets that meet the requirements, cut them into small pieces for production. Small pieces that meet customer requirements.

Process: large sheet → cutting board according to MI requirements → cutting board → beer fillet edging → board out

3. Drilling

Purpose: According to the engineering data, drill the required hole diameter at the corresponding position on the sheet that meets the required size.

Process: stacking pin → upper plate → drilling → lower plate → inspection and repair

4. Immersion copper, electroplating thick copper

Purpose: Copper sinking is to deposit a thin layer of copper on the insulating hole wall by chemical method.

Process: rough grinding → hanging plate → copper sinking automatic line → lower plate → dipping % dilute H2SO4 → thickening copper

5. Graphic transfer (circuit)

Purpose: Graphic transfer is the transfer of the image on the production film to the board

Process: (blue oil process): grinding board→printing the first side→drying→printing the second side→drying→exploding→imprinting→checking; (dry film process): hemp board→lamination→standing→pairing Bit→Exposure→Stand→Development→Check

Seven, solder mask (print ink)

Purpose: Green oil is to transfer the graphics of green oil film to the board to protect the circuit and prevent the tin on the circuit when welding parts

Process: grinding board → printing photosensitive green oil → curium board → exposure → developing; grinding board → printing the first side → baking board → printing the second side → baking board

8. Characters

Purpose: A character is provided as an easily identifiable mark

Process: green oil after finishing → cooling and standing → adjusting the screen → printing characters → after cutting

Ten, surface treatment process (lead spray tin, lead-free spray tin, immersion gold, gold plating...etc.)

Purpose: Spray tin is to spray a layer of lead and tin on the bare copper surface that is not covered with solder mask oil to protect the copper surface from corrosion and oxidation, so as to ensure good welding performance.

Process: micro-etching→air drying→preheating→rosin coating→solder coating→hot air leveling→air cooling→washing and air drying

12. Forming

Purpose: Through die stamping or CNC gong machine gongs out of the shape of the customer's required method of forming organic gongs, beer boards, hand gongs, hand cutting

Description: The accuracy of the data gong machine board and the beer board is high, the hand gong is second, and the hand cutting board Z low tool can only make some simple shapes.

13. Test

Purpose: Through the electronic 100% test, detect the open circuit, short circuit and other defects affecting the function that are not easy to be found by visual inspection.

Process: upper mold → board release → test → qualified → FQC visual inspection → unqualified → repair → return test → OK → REJ → scrap

14. Final inspection

Purpose: 100% visually inspect the appearance defects of the panels, and repair minor defects, so as to avoid the outflow of defective and defective panels.

Specific workflow: incoming materials → viewing materials → visual inspection → qualified → FQA spot check → qualified → packaging → unqualified → processing → check OK