 |
Urethane Strippers
• No noise when punch
• Cushions the impact.
• Reduce sheet metal rattle.
• Safe: will not crack
• Markless even on polished aluminum.
• Improved sheet flattening, no puckering.
• Positive stripping keeps sheet metal from moving.
The TRUMPF Push-On PU Stripper is an elastomeric counter-force element that surrounds the punch and is friction-fitted directly onto the punch body, specifically engineered for the company's tool systems (like those in their TruPunch machines).
Original Word Description:
This stripper is a unitary polymer sleeve—typically composed of a high-density polyurethane (PU) elastomer—that is designed for snap-fit engagement directly over the lower shank of the punch.
Its function is that of a localized, resilient cushion or material constraint device. Upon the machine ram's descent, the stripper compresses against the sheet metal, applying a concentric holding force around the immediate perimeter of the forming or punching zone.
The key features are its self-retaining, press-fit geometry and its viscoelastic dampening capacity. It exerts the necessary retraction tension (stripping force) to overcome the material's tendency to cling or spring back (known as the stripping load) to the punch tip upon the ram's ascent.
This push-on design obviates the need for heavier, multi-part steel stripper assemblies in many applications, facilitating lighter tool cartridges and allowing for faster tool changes due to its simplicity and integral nature. Its precision lies in its calibrated durometer (hardness), which determines the appropriate stripping tension for various sheet metal thicknesses and material types.
