Under the draw bead distribution, the shape and parameters remain unchanged; use the orthogonal experiment and ETA (engineering technology associates)/Dynaform simulation software to analyze BHF (blank holder force), die corner radius, die clearance
, and friction coefficient to study impact level of these four parameters with the results of maximum thinning rate and maximum thickening rate and optimize these parameters.
Always check with the CPC supplier for screen-pack and die clearance
For blow molders who make multiple product changes, adjustments must be made to the equipment's pin and die clearance
to accommodate the wall thickness of various parts.
* the effect of varying die clearance
is evident when the machine is full, whereas it is insignificant when it is partly loaded (polymer mastication stage);
The company, which builds its own dies, says this product uses its thinnest die clearance
These dies are designed for high performance punching of thin sheet metal where the recommended die clearance
is less than 0.008" (0.20mm).
The critical need is to maintain a minimum die clearance
at all times.
While the bulk of the tools in the turret are standard tools and do not change, pre-built die cassettes with different die clearances
provide flexibility to react to customers' needs.
for fineblanking can be held much tighter than stamping, promoting smoother and straighter edges on parts.
That usually indicates that the turret plates don't always line up perfectly or that the die clearances
are not perfectly spread around the punch because of the various parameters that affect tool and die alignment."
Tool changes typically require the operator to recalibrate pin and die clearances
using a programming cylinder that operates at 2000 psi.