If the material with protective film on the surface is punched out, the film will not be cut completely and it will remain on the material, causing the holding mark and slug pulling.
In this case, the following measures can be considered.

• 1. First of all, keep the cutting edge of the punch and die sharp.
  If cutting is done with the cutting blade worn, the film will not be cut.
  We recommend regrinding at shorter intervals than usual.
  In particular, please note that the corners of the square and rectangle punch are easily worn.
• 2. Use a narrow clearance die than standard.
  In addition, there is also a method to reduce the stretch of film by narrowing the guide clearance and holding the edge of the hole.

Fig.1 Clearance between punch and die

Fig.2 Clearance between punch and guide

• 3. Increase die penetration.
  (Adjust a punch height length longer)
  (See Fig.3)
• 4. If the punch edge has a urethane kicker and it is deteriorated,
  replace it with a new one.

Fig.3 Die penetration

Height adjustment is required when using a forming tool.
Generally, for height adjustment…

• 1. Perform on the machine side.
  (For hydraulic type)
• 2. Perform the head adjustment.
• 3. Adjust with shim.

When performing height adjustment with shim,
the shim set consists of a total of 5 shims with a thickness of 0.4, 0.5, 0.6, 0.7 and 0.8 each.
Please use in combination referring to the table on the right.