How to prevent slug pulling?ACADEMY > TIPS AND INFORMATION > How to prevent galling?Punching thicker material ( <3~4mm - .118"~.157" MS / <2~3mm - .078"~.118" SS)

How to prevent galling?

Excessive heat, incorrect die clearance and lack of lubrication are the most common causes.
Galled Punches cause stripping problems, poor hole quality and accelerated tool wear.

How to prevent galling?

  • Sharp Punches & Dies
  • Lubricate Work Piece
  • Use Proper Coated Punch
  • Increase Die Clearance (0,1mm - .003" wider)
  • Adjust Machine Hit Rate (Slower)
  • Use Tool Lubrication If Available
  • Use foam with oil between punch and stripper
  • Change slitting tool sequence

A) Standard slitting sequence

B)“Bridge” sequence to prevent galling