Solutions for common issues

Problem	Possible causes	Solutions
Excessive burr	Incorrect clearence between punch and die Worn tools Misaligned components	Restore correct clearence Sharpen or replace tools Check alignment
Punch or die breaking	Incorrect clearence Critical corners related to thickness Punch section inadequate to thickness	Restore correct clearence Modify the tool with adequate radii Contact our sales dept
Punch does not extract	Incorrect clearance between punch and die Lack of lubrication Hard material Ineffectual extraction system Tool limit	Restore correct clearance Lubrificate or, if it is not possible, use coated punches Revise clearance Replace spring or pre-load Pass to next station or, if it is not possible, contact our sales dept
Punch galling	Insufficient die clearance Lack of lubrication Hard materials or excessive speed	Restore correct clearance Lubricate or, if it is not possible, use coated punches Reduce nibbling speed
Excessive tool wear	Incorrect clearance between punch and die Hard or abrasive material Misaligned components Inadequate nibbling Ineffectual extraction Poor sharpening	Restore correct clearance Usare utensili rivestiti Check the program Check and carry out maintenance more frequently See point “punch does not extract”
Scrap pulling	It mainly occurs on small diameter and with material thickness up to 1,5 mm The punch is glued or oil gets the scrap stuck	Increase penetration into die or use whisper sharpened punches Always demagnetise after sharpening, clean the excessive oil or replace it with a more fluid one
Piece deformation	Incorrect clearance between punch and die Lack of lubrication Holes are in a too close sequence	Restore correct clearance Lubricate or use whisper punches Reprogram alternating punching sequence
Cutting edges breaking	Punch system axial flexure Scrap pulling and consequent double side shearing thickness (fig. 1) Inadequate nibbling step Inadequate extraction (fig. 2a) An excessive extraction load might cause tears or chips on the punch face. (fig. 2b)	Check guide tolerance and wear Check clearances, slug retention or punch press stroke Check and modify program Replace spring or pass to next station