PCB Technical - Maintenance and maintenance methods for PCB electroplating

In the production process of PCB circuit boards, the plating layer directly affects the subsequent etching process, and the quality of the plating layer is very important to the quality of the entire circuit board. Electroplating equipment occupies a large proportion in all PCB circuit board manufacturers. In order to ensure the normal operation of electroplating equipment, ensure the stability during operation and the service life of electroplating equipment, the correct maintenance and maintenance of the equipment is very important. It mainly introduces the maintenance and maintenance of electroplating equipment commonly used in PCB circuit board manufacturers.

1. Types of electroplating equipment in PCB factory

In the PCB circuit board production process, there are two main types of electroplating equipment, one is the horizontal electroplating line, and the other is the vertical electroplating line. The two electroplating equipment with different structures are mainly different in the way the circuit boards are transported, and the structure of the conveying board equipment used is also different, so the maintenance is also slightly different.

2. Daily maintenance and maintenance methods of electroplating equipment in circuit board factories

1. Maintenance and maintenance of electroplating tank in circuit board factory

The main difference between the vertical plating line and the horizontal plating line is that the circuit board is transported differently, and the maintenance and maintenance methods of the tank body are essentially the same. Each washing tank shall be cleaned once in 7 days. The pickling tank shall be cleaned once and its bath liquid shall be replaced; the spray device in the tank shall be inspected once to see if there is any blockage, and the blockage shall be carried out in time Dredge; the conductive support on the copper plating tank and tin plating tank and the contact position of the anode and the live wire can be cleaned with a rag and sandpaper for polishing; for the copper plating tank, the titanium basket and tin strip basket of the tin plating tank Perform an inspection, replace the rotten titanium basket bag and tin strip basket, and add copper balls and tin strips.

After adding copper balls and tin strips within 7 days, electrolyze the copper electroplating bath and tin electroplating bath. In 7 days, high and low current methods will be used for trial production, so that after the new copper balls and tin bars are added, the production performance is stable before production. The copper ball and anode bag should be cleaned every 90%. Use activated carbon to filter and clean the bath every 120 to 150 days, filter out impurities in the bath, and clean the tin bath.

2. Maintenance and maintenance of the vibration mechanism of the vertical electroplating line in the PCB factory

In vertical electroplating, in order to ensure the uniformity of surface copper and the effect of hole copper during electroplating, the plate will be vibrated and rocked, and there will be a vibrating rocking mechanism on the tank. In 30 days, check the reducer to see if it is operating normally and check its tightness; check the tightness of the vibration mounting motor bolt; check the wear of the vibration rubber, and replace it in time if the wear is more serious. [1]. Check the contact status of the power cord in the junction box for 180 days. If the connector is loose, fasten it in time. If the insulation layer of the wire is melted or aging, the power cord must be replaced in time to ensure the insulation between the power cords. ; It is necessary to check all the bearings on the vibrating mechanism once, and replace the severely worn bearings in time with the grease last time.

3. Maintenance and maintenance of vertical electroplating line cranes in circuit board factories

The vertical electroplating line is to transport the circuit board by crane and hanger. Clean the crane and the hanger once a week (the crane and the hanger do not need to be disassembled) to keep their appearance neat and tidy. When cleaning, you can use a rag to wipe, and use sandpaper to polish. Check the hanger once every 30 days to check the damage of the hanger; check and maintain the motor and reducer of the crane, check the entire transmission device, and ensure its normal operation. Carry out an in-depth cleaning and maintenance of the driving and hanging equipment in 180 days. The hanging equipment must be removed from the driving and cleaned.

4. Maintenance and maintenance of the horizontal electroplating line transmission device of the circuit board factory

The conveyor device used in the horizontal electroplating line is a roller, which uses the rotation of the roller to continuously feed the circuit board into each tank. Therefore, the maintenance of the horizontal electroplating line transmission device is somewhat different from that of the vertical electroplating line. Clean the rollers of the horizontal electroplating line once every 7 days to clean the foreign matter adhering to the rollers to ensure that the plate surface is clean when conveying the plate; check the coupling to check whether it is loose. The rollers are inspected every 180 days to check whether the rollers are worn or not, and the worn rollers should be replaced in time to ensure that there will be no jamming when conveying the plate; the transmission gear, the transmission shaft and the entire transmission system should be checked. The device shall be inspected once, and timely repairs shall be made for any problems.

5. Maintenance and maintenance of the circulating filter system of electroplating equipment in the circuit board factory

Check the filter cartridge of the circulating filtration system once every 7 days to see if there is any leakage in the filter cartridge. The filter core should be cleaned or replaced every 10-15 days. The filter carbon core should be replaced within 30 days to ensure the filter quality and the flow rate of the filter; the filter pump should be cleaned once and the filter hood and filter screen of the air pump should be cleaned. Check the contact condition of the pump motor power cord connector once every 30 days. If it is found to be loose, it should be tightened in time. If the wire is aging, replace with a new wire to ensure good contact and safe insulation to protect the motor.

6. Maintenance and maintenance of other parts of electroplating equipment in the circuit board factory

The output power of the power supply should be checked twice within 7 days; the power supply, the heat dissipation trend of the electrical control, and the radiator should be checked, dust and cleaned to prevent it from affecting the heat dissipation. Check the electrical components of the electrical unit within 30 days, and replace them if they are damaged or corroded; check all connectors, and repair them if they have poor contact, virtual connections, or soldering, and replace them if they are corroded or damaged. ; Check all contactors and relays. If there is poor contact or contact adhesion, replace them in time; check the main parameters of capacitors, reactors, resistors and other components. If abnormalities occur, replace them as soon as possible.

For the automatic feeding system, the calibration should be checked once every 7 days. Clean the scale and dirt on the electric heater within 7 days to prevent the internal temperature of the electric heater from becoming too high.

For each water and gas pipeline system, check it once every 7 days to see if there is any running, leaking gas or liquid. The pipelines with running or leaking gas and liquid should be repaired and replaced in time.

3. Discussion on the maintenance of the electroplating equipment of the circuit board factory before the long-term shutdown

If the equipment is planned to be shut down for a long time, it is necessary to maintain it so that it will not be corroded and aging during the shutdown process. Do: Clean the ground, wipe off the water on the ground, keep the ground dry, and keep the machine on the machine. Keep clean and dry in the tank, driving, and hangers; all motors should be protected with plastic wrap; all bearings are injected with grease to prevent rust; all the medicines in the pipelines are cleaned; the filter Clean the syrup in the filter bucket; take out the filter element of the filter and clean it; all the heaters in the tank must be cleaned to remove dirt and keep dry.

Electroplating equipment used in the production of PCB circuit boards, due to different production processes and different PCB manufacturers, will have certain differences in the equipment. Therefore, there will be some differences in the maintenance methods, but the equipment must be maintained in a timely and correct manner., Do not neglect the maintenance and maintenance of the equipment because of the production schedule and output. Only if the maintenance is correct and timely, can the normal operation of the equipment, stable performance, and production output and quality be guaranteed.