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An automated technique for subjecting circuit card samples to temperature shock provides more reliable and consistent test results than hand operations.
English (United States)
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Automated Crack Test Machine
An automated technique for subjecting circuit card samples to temperature
shock provides more reliable and consistent test results than hand operations.
Referring to the figure, a circuit card 1 is attached to a clamp 2 on an arm 3 in
a loading station 4 and a transport mechanism is started. A motor and gear
assembly 5 rotates screw shaft 6 with pinion (not shown). The pinion engaged in
the rack 8 moves the arm to the left which carries the clamp and the card to the
center of the shell 9 through its vertical elongated slot. At the end, the guide
block 7, which supports the arm, slips down from the pinion, engaging screw
shaft 6 and travels down, lowering card 1 into a pool of solder 10 held at a
required temperature by heater 11. The motor stops to allow immersion of the
card for a timed period and then reverses to move the card upwards in the shell.
Air knives 12 and 13 direct hot air from heater 14 across the card to remove
excess solder. When guide block 7 has reached its upper limit, the rack again
engages the pinion (not shown), which disengages the guide block from the
screw shaft. The pinion retracts the clamp and card to the right where it is cooled
by an air blast from nozzle 15 supplied with cold air from compressed air source
16 through valve 17.
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