Browse Prior Art Database

Pin-Removal Device

IP.com Disclosure Number: IPCOM000047571D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Balder, WB: AUTHOR [+2]

Abstract

Defective or damaged pins on a multilayer ceramic substrate must be removed and replaced in order to render the substrate usable. Defective pin removal must not damage the substrate. Disclosed herein is a device for removing defective pins in a brazing furnace environment without damage to the substrate. The pin-removal device comprises a stud which grips the pin shank and a high temperature spring which exerts a force to raise the pin when the pin braze joint melts. Referring to the figure, a multilayer ceramic substrate 10 includes pins 11 brazed to one surface thereof. The pin-removal device comprises a pin nest 12 having pin pullers 15 at locations of defective pins.

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Pin-Removal Device

Defective or damaged pins on a multilayer ceramic substrate must be removed and replaced in order to render the substrate usable. Defective pin removal must not damage the substrate. Disclosed herein is a device for removing defective pins in a brazing furnace environment without damage to the substrate. The pin-removal device comprises a stud which grips the pin shank and a high temperature spring which exerts a force to raise the pin when the pin braze joint melts. Referring to the figure, a multilayer ceramic substrate 10 includes pins 11 brazed to one surface thereof. The pin-removal device comprises a pin nest 12 having pin pullers 15 at locations of defective pins. Each pin puller includes a barb 13 or screw 14 for gripping the pin, and a spring 16 for raising the pin a distance 17 when the braze joint 19 between pin 11 and substrate 10 melts. To remove the pins, the substrate and pin-removal device are cycled through the brazing furnace. Pin weights 18 are placed on non-defective pins to prevent pin migration. After removal, the removed pins are replaced with new pins, the pin pullers 15 are replaced with pin weights 18, and the substrate is again cycled through the brazing furnace to braze the new pins.

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