Page 19 - MetalForming-Jan-2018-issue

Tooling by Design
Tonnage Curve
Tonnage Zone
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 Inches Up From Bottom
can be challenging for the die setter but is critical for successful progres- sive-die stamping processes. While highly accurate feed systems that prac- tically eliminate the need for pilots in a die are available, there are many older feeds still in use that will overwork pilots beyond their original design intent if the feed is not set properly. In both situations, die setters are relied upon to properly adjust or to program the feed to accurately position the coil strip in the next die station. This avoids inconsistencies in product quality and the likelihood of tool breakage or pre- mature wear.
The pilot-release function, often referred to as feed release, allows the strip being fed into the die to be released so that the pilots in the die can properly position and register the strip. For the pilots to position the strip correctly, the feed rolls must unclamp the strip before full pilot entry. If the feed rolls open too soon—before the pilots enter the strip—the strip could
pull out of position due to the weight of the material in the feed loop between the feeder and the coil.
Coil Payout (Unwinding)
Single-end coil reels are available in powered and unpowered models. Features
may include a variable-speed
drive, loop-arm speed control,
and hydraulic arbor expansion. Double-end coil reels are motorized to pay out material
to a servo-driven straightener- feeder. The reel is equipped
with side guide rollers, powered indexing, powered mandrel expansion and dual hold-
downs for increased safety. Noncontact loop controls and coil cars also are available for both types. Die setters must be properly trained in the use and application of all available features in the feedline.
Interested in learning more about
Fig. 2—Only half the rated force is available 2 in. up from bottom
die setting practices and safety? Join me in Nashville, February 21-22, for PMA’s Die Setting Practices and Safety seminar. Visit PMA’s website to register, or contact Marianne Sichi, msichi@pma.org, for more information.
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