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Browse Prior Art Database

Oil Seal/Bearing Solder Fountain

IP.com Disclosure Number: IPCOM000047027D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Baron, PL: AUTHOR [+4]

Abstract

With technology advancing at its present rate, larger components and printed circuit cards are being developed, creating a demand for more advanced solder fountain rework stations. A concept is proposed which will allow an infinite volume of solder to come in contact with the card, creating a more uniform heat source for component removal. The fast heating rate allows the solder joint to reach the liquidus temperature at a faster rate, enabling the removal of large modules in a very short time with less copper dissolution and no card delamination. Approximately 35 lbs. of solder are melted in a conventional solder pot 1. A standard cylinder 2, which is used to channel the solder upwards, has a press fit to the solder pot casting.

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Oil Seal/Bearing Solder Fountain

With technology advancing at its present rate, larger components and printed circuit cards are being developed, creating a demand for more advanced solder fountain rework stations. A concept is proposed which will allow an infinite volume of solder to come in contact with the card, creating a more uniform heat source for component removal. The fast heating rate allows the solder joint to reach the liquidus temperature at a faster rate, enabling the removal of large modules in a very short time with less copper dissolution and no card delamination. Approximately 35 lbs. of solder are melted in a conventional solder pot 1. A standard cylinder 2, which is used to channel the solder upwards, has a press fit to the solder pot casting. The lower end protrudes through the bottom of the casting and is held in position and sealed against leakage by a nut 3 which pulls it against a shoulder. The top of the cylinder is capable of accommodating solder chimneys 4 of different shapes and sizes. A uniform one-inch (diameter) shaft 5 is inserted through the bottom of the cylinder, having on its upper end an impeller 6 and on the lower end a chain sprocket 7. Both the cylinder and the shaft are made of similar metals with a maximum clearance of .002 inch between them. High temperature oil is continuously filtered down through an orifice 8, thus applying a uniform thin film of oil between the two metal surfaces due to the rotating motion. The oil p...