A PCB
bell mouth manufacturing method comprises the following steps: 1, selecting a taper
drill bit according to the
bell mouth sizes; 2, calculating a drilling depth according to the
client required
bell mouth orifices bore
diameter, and writing the result <b=a / tg(r / 2)> into a bell mouth boring program; 3, working in order according to a routine boring flow: a, mounting a
joist plate; b, planting pins; c, loading a backing plate; d, loading a drilled plate; e, covering an
aluminium sheet and pasting a gummed paper; f, starting a
machine part
mushroom head to press the
aluminium sheet; g, covering a cold
punching plate and using a gummed paper to firmly paste on same; 4, using an universal meter to confirm the
aluminium sheet is connected with a drilling
crew table top, and ensuring the unique
coupling conduction portion between the aluminium sheet and the drilling
crew table top is the
mushroom head; 5, boring. The method calculates the drilling depth according to the tapper drilling bit angle and inputs the program, and the drilling
crew can automatically make the bell mouth; the method is high in efficiency, and can make the precise bell mouths.