Metal fusion bonding – Process – With protecting of work or filler or applying flux
Patent
1993-11-16
1995-12-05
Bradley, P. Austin
Metal fusion bonding
Process
With protecting of work or filler or applying flux
228 42, 228254, B23K 3538, B23K 3162
Patent
active
054721350
ABSTRACT:
The present invention provides a reflow apparatus and method effective to make constant the internal gas flow direction in a heating section within a reflow furnace. A circulating gas path is formed in a heating unit which collects and causes the gas to flow from a sirocco fan, up the rear side of the heating unit and then down towards a circuit board moving along a transfer path at the front side of the heating unit. Moreover, a plurality of straightening plates are arranged above the transfer path of the heating unit so as to guide the hot gas, which is flowing forwardly downwardly toward the circuit board moving along the transfer path. A blow-down nozzle is provided and includes a plurality of plates aligned in rows in the transferring direction of the circuit boards. The plates have an inverse U-shaped cross section. The blow-down nozzle is arranged below the straightening plates to cause the vertical hot gas flows to flow uniformly over the whole surface of the circuit board.
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Ando Manabu
Hamasaki Kurayasu
Ishimoto Kazumi
Kuwabara Kimihito
Mimura Toshinori
Bradley P. Austin
Knapp Jeffrey T.
Matsushita Electric - Industrial Co., Ltd.
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