Aluminum base PCB board production
(1) Machining: The aluminum substrate can be drilled, but no burrs are allowed on the edge of the hole in the hole after drilling, which will affect the withstand voltage test. Milling the shape is very difficult. The punching shape requires the use of advanced molds, and the mold making is very skillful, as one of the difficulties of the aluminum substrate. After the shape is punched, the edge requirements are very neat, without any burrs, and do not hurt the solder mask on the edge of the board. Usually, the military model is used, the hole is punched from the line, the shape is punched from the aluminum surface, and the force is the upper cut and the pull down when the circuit board is punched, and so on. After punching the shape, the board warpage should be less than 0.5%.
(2) The entire production process is not allowed to wipe the aluminum base: the aluminum base is touched by hand, or the surface is discolored and blackened by certain chemicals. This is absolutely unacceptable, and the aluminum base is re-polished. It does not accept, so the whole process does not hurt, and does not touch the aluminum base is one of the difficulties in producing aluminum substrates. Some enterprises use passivation technology, and some put protective films on the front and back of hot air leveling (spray tin)... There are many tricks, and the Eight Immortals cross the sea.
(3) Over-voltage test: The communication power supply aluminum substrate requires 100% high voltage test, some customers require DC power, some require AC power, voltage requirements are 1500V, 1600V, time is 5 seconds, 10 seconds, 100% printed board for testing. Dirty objects, holes and aluminum-based edge burrs, line serrations, and any other bit of insulation on the board will cause high-voltage test fire, leakage, and breakdown. The pressure test panels were layered and foamed and rejected.
Please,contract us if you need costomize your own Aluminum Base PCB Board,send you gerber file and bom list to firstname.lastname@example.org via email.