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Burr problem when cutting tungsten wire

Burr problem when cutting tungsten wire

Burr problem when cutting tungsten wire

We are manufacturing a burner mount support out of 0.020" tungsten wire.  We are cutting the material off the machine against a quill.  The quill and cutoff tool is made of Tungsten Carbide 10% Cobalt. Once each part is cutoff we are finding a small burr about .003" to .005". We used Tungsten Carbide 15% cobalt and had massive tool wear and we splitting the wire. We are running about 2,500 pcs per hr.  I was wondering if their is a tool steel specially made to cut tungsten wire burr free?  If not I will need to invest in a different cutoff system on our machine which is big $.

RE: Burr problem when cutting tungsten wire

Though not directly involved in the process where we used Tungsten wire I do remember that they had problems with the degree of anneal on the smaller wires.  For our use we wanted a full anneal.  A partially annealed wire should cut better.
Splitting is a inherent defect of the W wire manufacturing process.  You can get wire with a low split count, for lack of words. Check the burr on your cut and see if it's a split in the wire.

Are you using pure W or WK (potassium) wire?

RE: Burr problem when cutting tungsten wire

We are using pure W wire which is full annealed. I will check one of the parts to see what type of burr it is.

thanks for the help

RE: Burr problem when cutting tungsten wire

Tungsten wire almost always splits when bent or cut, regardless of the degree of anneal - you have to heat it to red heat (900 F or more) before it has any ductility to speak of.  We always cut it with a grinding wheel (Dremel cut off wheel) to avoid splits as much as possible.  W/3Re has a bit more ductility if you need it.

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