Notes on pcb drilling production
pcb drilling is the primary link in the printed circuit board, different layers of circuit board conductive graphics between the copper foil line is to use this hole to guide or connect up, but can not be inserted into the component legs or other enhanced materials copper plating holes, printed circuit board (PCB) is formed by many copper foil layers stacked cumulative, copper foil layers can not interoperate with each other because between each layer of copper foil are laid on a layer of insulation, they need between The production process can not be achieved by gluing the circuit board and then drilling the way, you must drill holes in the individual circuit layers, first partially gluing the inner layer after the plating process, and finally all glued, because the operation process is more laborious than the original conductive holes and blind holes. The production process is usually only used for high-density circuit boards to increase the space utilization of other circuit layers, in the printed circuit board (PCB) production process, drilling is very important, drilling is simply understood that the copper laminate is drilled out of the required holes, with electrical connections, fixed device function, if the operation is not correct resulting in the hole process problems, the device can not be fixed on the board. Devices can not be fixed on the board, the light impact on the use of the board, the heavy let the whole board are scrapped, so drilling this process is quite important.
Circuit board through-hole must be plugged through the hole to meet customer needs, in changing the traditional aluminum plug hole process, circuit board board surface solder and plug hole using white mesh to complete, so that its production is more stable, more reliable quality, the use of more perfect, through-hole help circuit interconnection conductive, with the rapid development of the electronics industry, but also on the printed circuit board (PCB) production process and surface mount technology to put forward higher requirements, through-hole plug hole process came into being, but also to meet the following requirements: 1, the hole only need to have copper, solder can be plugged can also not plug;
2, the hole must have tin-lead, a certain thickness requirements (4um), to avoid resist ink into the hole, resulting in the hole hidden tin beads;
3, the conductive hole must have solder resist ink plug hole, not transparent, there must be no tin ring and tin beads, must be flat and other requirements, is the printed circuit board (PCB) in the outermost circuit and adjacent to the inner layer between the plating hole to connect, due to the inability to see the opposite side, so called blind pass, in order to increase the utilization of space between the board circuit layers, blind holes will come in handy, blind holes is also to the surface of the printed circuit board a guide hole blind hole Located on the top and bottom surface of the circuit board, with a certain depth, for the surface layer of the line with the following inner layer of the line connection, hole depth generally has a specified ratio (aperture), this production method requires special attention, drilling depth must be just right, do not pay attention to words will cause the hole plating difficulties, so there are few factories will use this production method, in fact, let the prior need to connect the circuit layer in the individual circuit layer when the first drill Good hole, and then finally glued together is also possible, but requires more precise positioning and alignment devices, buried holes, is the printed circuit board (PCB) internal connection between any circuit layer, but not with the outer layer of the conductive, that is, not extended to the surface of the circuit board conductive hole means that this production process can not be achieved through the circuit board bonding and then drilling way, must be in the individual circuit layer drilling operation, first partial Bonding the inner layer after the plating process, and finally all bonding, due to the operation process than the original conductive holes and blind holes more laborious, so the price is also the most expensive, this production process is usually only used for high-density circuit boards, increase the utilization of space for other circuit layers, in the printed circuit board (PCB) production process, drilling is very important, drilling is simply understood that the laminate is drilled out of the required hole, with the provision of Electrical connection, fixed device function, if the operation is not correct resulting in the hole process problems, the device can not be fixed on the board, the light affect the use of the board, the heavy let the whole board are scrapped, so pcb drilling this process is quite important.