HOW AND WHY FAST PIERCE TM HIGH VELOCITY STAMPING WORKS
WHY CONVENTIONAL PRESSES CAN NOT CUT THE NEW SERIES OF HARD MATERIALS
A conventional press cannot stamp boron steel, titanium and many of the new high strength steels, alloys and composites simply because they are harder and cause the tools to fail prematurely.
WHY THE NETRONICS FAST PIERCE HIGH VELOCITY PRESS CAN
Our engineers have developed a computer based system that measures forces on the punches and dies while stamping. The results were amazing.
We found that that when increasing the punch velocity, the measured forces on the punches decrease as much as 60%! We believe that the heat generated in the shear zone at higher punch velocity lowers the molecular bonds of the material being stamped thus momentarily lowering the shear strength. Reduced roll over and work hardening also attributed to less force and wear on the tool.
WHY PART QUALITY IMPROVES WHEN USING THE NEW FAST PIERCE METAL STAMPING PRESS
Rollover and flatness problems are caused by the work hardening effect that occurs before the punch penetration begins. The penetration force is much higher thus causing the rollover and flatness distortions in the material. High velocity fast piercing dramatically reduce the material penetration forces resulting almost no rollover or flatness distortions. When this occurs the process may be considered adiabatic.
RESULTS USING A CONVENTIONAL PRESS
Poor edge quality results because the shearing forces
exceed the break through rupture force thus the very
rough rupture zone. Fast Pierce stamping reduces the
shearing forces, preventing the rupture.
RESULTS USING A FAST PIERCETM PRESS
Spring back results because of complicated stress/strain relationships that occur when bending metals. When bends occur rapidly, as they do when using a fast pierce press, the temperature rise is increased dramatically. This equalizes the inner and outer surface temperatures, there by reducing the spring back.
Less oil required: Forces, friction and the punch dwell time are dramatically reduced when high velocity fast pierce presses are used. Therefore lubricants may be eliminated or changed to a light evaporating lubrication is often used. This, combined with the reduced burr, can eliminate many secondary part operations