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High Speed Progressive Dies 

•The high speed stamping tools shown on the following pages are mostly produced from thin materials .005-.015.  Many of the parts are designed to accept a contact wire or are assembled into another device or mold.  Strip growth is not an issue.
•In most of the strips shown, the pierce hole is .126 +/- .0004 dia. The pilots are .0004-.0008 smaller than the pierced hole, not the pierce punch.  This is because, depending on the material and clearance, the hole may close or open after piercing.
•The pilot holes in the die are made .0004-.0008 larger than the pilot itself.  The pilots do not need to be spring loaded because of the thinness of the metal.  It is a good practice to stone the pilot holes slightly after grinding or sharpening to remove any grind burr left.
•All dies on the following pages are designed with guided strippers.  As a general rule the stripper clearance should be no more than half the cutting clearance.  Die side slug retention is critical.
Ball cage type die shoes are recommended for increased accuracy.  Press accuracy is also critical, especially at higher speeds.
•A minimal lube application works best .  This prevents the material from sticking to the stripper and being pulled out of the die.  Die mounted strippers eliminate this.
•When stamping less than .010 thickness do not use punches with slug ejectors.  The slug ejectors can actually deform the stock before punching.  Utilize die side slug retention only.
•The tool should be designed so that coil changes can be made easily and the remaining strip can be removed without any die dis-assembly.
•When using carbide avoid any chlorine based lubricants.  They can cause carbide to flake and break off.
•These high speed dies should be set up with a quick clamping mechanism.  .Since many high speed applications involve thinner materials, the change in tonnage is small when a miss hit is made or striking double thickness.  It is a good practice to add both a miss hit indicator and a double thickness indicator as a minimum.
•Incorporating die electronics and sensors will improve efficiency as will high speed servo feeds. In higher production applications electronic gaging, vision systems and attribute gages should be utilized.
•Always consider die mounted spring loaded guided strippers.  This eliminates any timing issues with the pilots.  It also allows for easier access at the press.
 
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