Browse Prior Art Database

Thermal Shock Tester

IP.com Disclosure Number: IPCOM000082432D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Wild, RN: AUTHOR

Abstract

This tester automatically subjects multilayer interconnection boards (MIBs) to a thermal shock test. The test determines the MIBs ability to withstand mechanical failures, such as interplane fractures of the plated through holes, due to the normal soldering operations subsequently performed on the MIB.

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Thermal Shock Tester

This tester automatically subjects multilayer interconnection boards (MIBs) to a thermal shock test. The test determines the MIBs ability to withstand mechanical failures, such as interplane fractures of the plated through holes, due to the normal soldering operations subsequently performed on the MIB.

The MIB sample S to be tested is inserted into normally closed tungsten wire grips 1 by raising sleeve 2. Next, a start pushbutton 3 activates a controller 4 which in response provides a control signal that actuates pneumatic cylinder 5. As a result, normally extended plunger 6 of cylinder 5 begins to lower at a controlled rate. Affixed to the plunger 6 is an arm 7 which supports the gripping mechanism 1-2. As a result, sample S is lowered onto the surface of a hot- solder float bath 8 in tank 9. Compressible spring 10 prevents sample S from being submerged into bath 8.

Controller 4 controls the dwell time that sample S is allowed to float on bath
8. At the end of the dwell time, controller 4 releases plunger 6 at a controlled rate so that the sample S is withdrawn from the bath. At a predetermined time after the sample S is above the bath 8, controller 4 activates horizontally mounted cylinder 11 causing it to release its normally retracted plunger 12. The latter, in turn, strikes the preset pivotable lever 13, which in turn strikes the anvil sleeve 14 with sufficient force to dislodge any solder that may have adhered to sample S from bath 8....