DIP plug-in post-welding processing is a process after SMT chip processing, and the processing process precautions are as follows:
1. Pre-processing of components
The staff of the pre-processing workshop picks up the materials from the BOM according to the BOM bill of materials, carefully checks the material model and specifications, signs, and performs pre-processing according to the model (using automatic bulk capacitor shears, transistor automatic molding machine, fully automatic belt type Processing equipment such as molding machines).
Claim:
① The horizontal width of the adjusted component pin needs to be the same as the width of the *** hole, and the tolerance is less than 5%;
② The distance between the component pins and the PCB pads should not be too large;
③ If the customer requests, the part needs to be formed to provide mechanical support and prevent the pad from lifting.
2. Paste high-temperature adhesive tape, enter the board → paste high-temperature adhesive tape, and block the tin-plated through holes and components that must be soldered later;
3. DIP plug-in processing workers need to bring electrostatic rings, wear anti-static clothes and hats to prevent static electricity, and perform plug-in according to the component BOM list and component bit number diagram. Care must be taken when inserting the plug-in.
4. For the inserted components, check them, mainly check whether the components are inserted incorrectly or missed;
5. For the PCB board with no problems with the plug-in, the next step is wave soldering. The wave soldering machine performs automatic soldering processing, which is a firm component.
6. Remove the high-temperature adhesive tape, and then check. In this step, the main inspection is to visually observe whether the soldered PCB board is welded intact;
7. Repair and repair the PCBs that are found to be incompletely welded to prevent problems;
8. Post-welding, which is a process set for components with special requirements, because some components cannot be directly welded by wave soldering machines according to the process and material limitations, and need to be completed manually;
9. After all components are soldered to the PCB board, a functional test is performed to test whether each function is normal. If a functional defect is detected, repair and test processing is required.
