We continue with our discussion on the heat treatment of fasteners by offering additional tips for the heat treater.
Tip #7: Avoid Mixed
Mixing of fasteners during heat treatment is commonplace. Avoidance and
understanding of where fasteners tend to “hang up” in the system is perhaps the
best strategy to combat this problem.
1. Leave adequate gaps (10-20 minutes) between different-sized fasteners
and different part/lot numbers.
2. Clean out quench tanks after each lot has exited the furnace. Often
operators use magnets mounted on poles to retrieve fasteners from quench or
3. During maintenance shutdowns, drain all tanks (pre- and post-washers,
quench and dip tanks) and inspect where parts are accumulating. Not only remove
these parts from all areas but implement solutions to keep parts from gathering
in these areas.
4. Use separator screens after the quench and after the temper to segregate
fasteners by size.
5. Remove stragglers from the system by off-line visual or size-sort means.
Fastener Heat-Treating Tips (part 6)
Dan Herring is president of THE HERRING GROUP Inc., which specializes in consulting services (heat treatment and metallurgy) and technical services (industrial education/training and process/equipment assistance). He is also a research associate professor at the Illinois Institute of Technology/Thermal Processing Technology Center. tel: 630-834-3017; e-mail: firstname.lastname@example.org; web: www.heat-treat-doctor.com
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