Press Uptime is the Key Measurable ...but never ignore the common practices offered here to ensure a failsafe design that provides safe die retention regardless of operating conditions. Metalformers should understand that hydraulic clamps are not required for quick die change (QDC). They should, however, consider automatic clamps whenever die-change times exceed 20 min., or when manual bolting fails to achieve sufficient press uptime. Further, variations in manual bolting torque may not attain safe and consistent die-retention forces. Torque variation can cause process variability in some operations. Of course, when manual bolting cannot be accomplished safely and consistently, power clamping offers a good alternative.
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