The foreman in the pressworking section comes to you with the problem of a blanking operation that is producing parts with excessive burrs. (a) what are the possible reasons for the burrs, and (b) what can be done to correct the condition?

There are many reasons can be happened behind it. But some specific reasons can be related to the problem

A) Reason for excessive burrs areas :  

The clearance between punch and die is too large for the material and stock thickness The punch and die cutting edges are worn which has the same effect as the excessive clearance.

B) To correct the problem

To check the problem in punch and die edge cutting If they are reground the faces to sharpen the cutting edges, If the die is not worn, Measure the punch and die clearance to see if it equals the recommended value.  If not the die maker must re-fabricate the punch or die.  

 

1190 is your answer! the way you get it is 1400 - 15% =1190 : )

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