PCB circuit board manufacturer's sampling process-Shenzhen Honlynn Circuit Co., Ltd.

PCB circuit board manufacturer's sampling process

2023-06-07

Before mass production of PCB circuit boards, it is generally necessary for PCB circuit board manufacturers to conduct sampling first, in order to make a small number of samples to test the quality of the products, and to some extent, to avoid risks for future large-scale production. So, what is the sampling process for PCB board manufacturers?

Step 1: Verify the data

Before production, the circuit board manufacturer will verify the board making data provided by the customer, including the size of the board, process requirements, and product quantity. The next step of production will only proceed after reaching an agreement with the customer.

Step 2: Material cutting

According to the customer's board making information, cut small pieces of production boards on the boards that meet the requirements. Specific operation: large plate material → cutting according to MI requirements → cutting the plate → cutting the corner/grinding the edge → discharging the plate.

Step 3: Drilling

Drill the required hole diameter at the corresponding position on the PCB board. Large plate material → Cutting according to MI requirements → Curing → Fillet/edge grinding → Plate discharge.

Step 4: Copper sinking

A thin layer of copper is deposited chemically on the insulating hole. Specific operations: rough grinding → hanging the board → automatic copper sinking line → lowering the board → soaking in 1% dilute H2SO4 → thickening the copper.

Step 5: Graph transfer

Transfer the images from the production film to the board. Specific operation: hemp board → film pressing → standing → alignment → exposure → standing → development → inspection.

Step 6: Graphic Plating

Electroplate a copper layer with the required thickness and a gold nickel or tin layer with the required thickness on the exposed copper sheet or hole wall of the circuit pattern. Specific operations: upper plate → degreasing → secondary water washing → micro corrosion → water washing → acid washing → copper plating → water washing → acid soaking → tin plating → water washing → lower plate.

Step 7: Remove the film

Remove the anti electroplating coating layer with NaOH solution and expose the non line copper layer.

Step 8: Etching

Remove non circuit parts with chemical reagent copper.

Step 9: Green Oil

Transfer the graphics of the green film onto the board, mainly to protect the circuit and prevent soldering of parts with tin on the circuit.

Step 10: Characters

Print recognizable characters on the PCB board. Specific operation: After the green oil is finally cured, cool and stand still, adjust the screen, print characters, and finally cure.

Step 11: Gilded Fingers

Apply a nickel/gold layer of the required thickness on the plug finger to enhance its hardness and wear resistance.

Step 12: Forming

Punch the shape required by the customer using a mold or CNC gong machine.

Step 13: Testing

It is not easy to detect functional defects caused by open circuits, short circuits, etc. through visual inspection, and can be tested using a flying needle tester.

The above is the process of PCB board factory sampling, hoping to be helpful to you!