The appropriate size of wire is very very important for the good life of a heading die.
Just the other day, one of my clients faced a problem in the die. When ever he used the die for 5 min or so, the carbide at the top where the head of the rivet is made got chipped off.
He tried many times after facing the die surface.
On closer inspection , it became evident that the wire size used for forging was 5.43mm and the heading die size was 5.45mm.
Thus, we increased the diameter of the die to 5.47mm and the asked our client to use the same die.
This time the die worked fine.
So a little variation in the wire size can lead to die breakage in the heading dies.
Also , for Stainless steel, a special oil is to be used, otherwise the forged piece sticks to the die and can cause die breakage.
I hope that this article will be of good help to all the people in the fastener line.
REGAL CARBIDE DIES PVT. LTD