PCB circuitry board cross aperture to jam solution detailed solution

  • Time:
  • Click:71
  • source:MCGUFFIE CNC Machining
Electric aperture Via Hole the name guides via, to achieve client demand, circuit board guides via must fill in aperture, through many practice, those who change a tradition is aluminous a craft of aperture of a place of strategic importance, finish circuit board with white net solder of board face block and aperture of a place of strategic importance. Production is stable, quality is reliable. Via Hole guides the circuitry since via connects each other guide conjoint effect, the development of electronic industry, also promote the development of PCB at the same time, also make craft and surface stick outfit technology to raise taller requirement to printed board. Emerge as the times require of craft of aperture of Via Hole a place of strategic importance, should satisfy following requirement at the same time: (one) guide there is copper inside via can, block solder can fill in can not fill in; (2) guide there must be stannic lead inside via, certain ply asks (4 micron) , do not get Chinese ink of soldering paste having block to enter hole, cause the Cang Xizhu inside aperture; (3) guide via must have opening of a place of strategic importance of Chinese ink of block soldering paste, not pervious to light, do not get group having stannum, the requirement such as stannic bead and level off. As electronic product to " light, thin, short, small " way develops, PCB also develops to high density, tall difficulty, because this appears the PCB of a large number of SMT, BGA, and the client is sticking aperture of a place of strategic importance of the requirement when assembling yuan of parts of an apparatus or appliance, basically have 5 effect: (one) the stannum when preventing PCB to cross wave crest solder from guide perforative component side causes via short circuit; Especially we cross aperture to be put in BGA solder dish when going up, must make hole of a place of strategic importance first, again aureate processing, of facilitating BGA solder. (2) avoid to aid welding flux remain to be in guide inside via; (3) electronic factory surface sticks outfit and component to assemble the PCB after finishing to want to suck vacuum to form negative pressure to just finish on test machine: (4) prevent exterior stannum to cream flow into empty solder is caused inside aperture, the influence is stuck outfit; (5) had prevented Shi Xizhu of wave crest solder to play piece, cause short circuit. The implementation 　 of craft of aperture of electric aperture a place of strategic importance sticks outfit board to the surface, especially of BGA and IC stick outfit to guiding via fills in aperture asks must level off, protruding is sunken losing 1mil, must not have guide via brim is aglow on stannum; Guide via hides stannic bead, to achieve the client's requirement, guide via fills in aperture craft it may be said is multifarious, technological process is particularly long, process control is difficult, have constantly rectify in sirocco smooth reach green oil to be able to bear or endure oil is dropped when soldering tin experiment; Explode after solidify the question such as oil happens. Show the actual condition that the basis produces, to PCB craft of all sorts of aperture of a place of strategic importance undertake inducing, make in flow and actor defect a few compare and elaborate: Note: Sirocco rectifies smooth working principle is to use surface of sirocco general PCB and Kongneiduo take out of more than solder, even Fu is in odd solder solder dish reach line of the solder that do not have block and surface to enclose a dot to go up, it is printed circuit board one of means of finishing. One, sirocco rectifies aperture of a place of strategic importance after making the same score to be versed in this technological process is art 　 : Solidify of → of aperture of a place of strategic importance of → of HAL of → of solder of board face block. Use flow of the aperture that be not a place of strategic importance to have production, sirocco is whole aluminium is used after making the same score piece net edition perhaps blocks Chinese ink net to fulfil client requirement of all fastness guide via fills in aperture. Printing ink of aperture of a place of strategic importance can use sensitive printing ink to perhaps heat up solid sex printing ink, below the circumstance that makes sure wet film color is consistent, printing ink of aperture of a place of strategic importance had better use as identical as board face printing ink. This technological process can make sure sirocco is whole after making the same score, guide via does not drop oil, but easy cause printing ink of aperture of a place of strategic importance contaminative board face, rough whole. The client is being stuck when outfit easy cause empty solder (especially inside BGA) . So a lot of clients do not accept this method. 2, sirocco rectifies 　 of 　 of craft of aperture of a place of strategic importance before making the same score 2.

1 with aluminium piece aperture of a place of strategic importance, solidify, grind board this technological process uses 　 of move of junior travel graph numerical control drilling machine, the aluminium that drills the hole that need a place of strategic importance piece, make net edition, have opening of a place of strategic importance, assure to guide via fills in aperture is full, printing ink of aperture of a place of strategic importance of printing ink of aperture of a place of strategic importance, also can use printing ink of hot solid sex, its characteristic must hardness is big, colophony systole change is little, as good as hole wall adhesion. Technological process is: → of aperture of pre-treatment → a place of strategic importance grinds board → graph to transfer → to etch 　 of solder of block of → board face can assure to guide Kong Ping of via a place of strategic importance is rectified with this method, sirocco is whole smooth won't have explode oily, Kong Bian drops the quality problem such as oil, but this craft requirement is one-time add thick copper, make copper of this hole wall thick the level that reachs a clientele, because this is right whole board copper facing demand is very high, and very high to grinding the function of trigger to also have demand, ensure the complete take out such as the colophony on cupreous range, cupreous range is clean, be not polluted. A lot of PCB factories are done not have one-time add thick copper craft, and the requirement of function short of of equipment, cause this craft to be used in PCB factory not much. 2.

2 with aluminium piece direct silk imprints after aperture of a place of strategic importance this technological process uses 　 of solder of board face block numerical control drilling machine, the aluminium that drills the hole that need a place of strategic importance piece, make net edition, installation imprints in silk opening of a place of strategic importance has on machine, the park after aperture of a place of strategic importance that finish must not exceed 30 minutes, with 36T silk screen direct silk imprints solder of board face block, technological process is: Pre-treatment -- aperture of a place of strategic importance -- silk imprints -- carbonado beforehand -- exposure one develop -- it is good that solidify 　 assures to guide via covers oil with this work skill, level off of aperture of a place of strategic importance, wet film color is consistent, sirocco is whole after making the same score, can assure to guide via do not go up stannum, stannic bead does not hide inside aperture, but the solder on the printing ink inside the aperture after causing solidify easily dish, cause solderability undesirable; Sirocco is whole after making the same score, guide via brim drops oil frothily, use this technique to produce control to compare difficulty, personnel of beard craft engineering uses special technological process and parameter ability to ensure quality of aperture of a place of strategic importance. 2.

3 aluminium piece aperture of a place of strategic importance, develop, beforehand solidify, grind board solder of block of junior andante face. With numerical control drilling machine, the aluminium that drills hole of requirement a place of strategic importance piece, make net edition, installation imprints in shift silk opening of a place of strategic importance has on machine, beard of Kong Bi of a place of strategic importance is full, both sides is outstanding for beautiful, repass solidify, grind board handle into andante face, its technological process is: Pre-treatment -- aperture of a place of strategic importance carbonadoes beforehand -- develop -- beforehand solidify -- because after this craft uses solidify of aperture of a place of strategic importance to be able to assure HAL, 　 of solder of board face block crosses aperture not to drop oil, explode oily, but after HAL, cang Xizhu crossing aperture and guide the stannum on via is solved completely hard, so a lot of clients are not received. 2.

Solder of 4 board face block and aperture of a place of strategic importance are finished at the same time. This method uses 36T (43T) webby, installation imprints in silk on machine, use bolster plate to perhaps nail a bed, completing board side while, will all guiding via plug, its technological process is: Pre-treatment- - silk imprints- - carbonado beforehand- - exposure- - develop- - solidify. Time of this technological process is short, the utilization rate of equipment is high, can make sure sirocco is whole aperture passes not to drop oil after making the same score, guide via do not go up stannum, but because use silk to imprint,have opening of a place of strategic importance, wear in memory crossing aperture a large number of air, when solidify, air expands, break through block solder film, make voidance hole, rough whole, sirocco rectifies smooth meeting to have a few guiding that via hides stannum. Current, my company passes many test, choose the printing ink of different type and viscosity, adjust an imprinted pressure to wait, basically had solved Kong Kong hole and rough whole, already used production of this craft batch. CNC Milling