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Hot Knife Reflow Soldering Tooling

IP.com Disclosure Number: IPCOM000044517D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 3 page(s) / 76K

Publishing Venue

IBM

Related People

Donald, GW: AUTHOR [+4]

Abstract

This article sets forth a tooling system which is capable of receiving circuit board contact sets manually or automatically from a cartridge-type dispenser, transferring the contact sets to correct locations on both sides of a circuit board, clamping the contact sets in place, releasing the transfer mechanism, and moving the boards and contact sets to a hot knife solder reflow station to be soldered in place. The "hot knife" soldering technique replaces the present hot gas technique which permits the execution of contact soldering operations with solid-state components in place on the circuit board which the hot gas operations presently prohibit. Success of a "hot knife" soldering operation lends itself to in-line auto processing of card assembly.

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Hot Knife Reflow Soldering Tooling

This article sets forth a tooling system which is capable of receiving circuit board contact sets manually or automatically from a cartridge-type dispenser, transferring the contact sets to correct locations on both sides of a circuit board, clamping the contact sets in place, releasing the transfer mechanism, and moving the boards and contact sets to a hot knife solder reflow station to be soldered in place. The "hot knife" soldering technique replaces the present hot gas technique which permits the execution of contact soldering operations with solid-state components in place on the circuit board which the hot gas operations presently prohibit. Success of a "hot knife" soldering operation lends itself to in- line auto processing of card assembly. Use of a specially designed "hot knife" heater housing and water cooling of certain areas of support tooling have made this tooling method feasible. The apparatus is shown in the Fig. 1 plan view and the Fig. 2 front vertical view. In operation, the tooling assembly is attached to the in-house compressed air supply 10 and house cooling water supply 12. Air pressure is regulated at 60 PSI, and the pneumatic actuators 14 are operated via a bank of manually actuated pneumatic switches 16. Water supply to the backplate manifolds 18 is direct from the house supply and return lines without specific regulation, other than a quick shut-off valve 20. Power to the sixteen heaters 22 is supplied through two power supply/regulators 24. Temperature regulation is accomplished via two control thermocouples 26, one at the preheat station 28 and the other at the "hot knife" station 30. Temperatures at the heaters 22 are monitored via thermocouples 32, a ten-position automatic scanner 34, and a single digital temperature readout 36. An individual thermocouple 38 is attached to each of the eight solder reflow "hot knife" heaters 40 in the solder reflow station 42. One thermocouple 44 is attached to each of the central upper and lower heaters 46 in the pre-heat station 28. Cards pre-fluxed on both sides of the contact area (two, two wide) are manually inserted in the contact preload station 48. The cards are located via the side notches and maintain position via nesting rails 50 and leaf springs 52. The contact pre-load station 48 is mounted on ball b...