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grinding Q's (titanium diboride)

Lambert

Hot Rolled
Joined
Oct 11, 2002
Location
Leiden , The Netherlands
Have been trying to use a diamond-wheeled cutoff saw with electronically variable spindlespeed and feed to cut through a block of titanium diboride.

My problems are heat development and walking of the saw.
Altough there`s a nice stream of coolant available on the cut and the walking bit is solved by slowing the feed...things are still heating up too much.
Causing the sawblade(0.4 mm thick) to get caught in the material.

I suspect that by slowing down the feed there`s more rubbing than cutting going on....so do I go looking for a coarser grit on the blade to minimise the rubbing action and thus heat-development ?
Or do is just need less spindlespeed ?
 
It sounds a bit like a coarser grit would help.. Also, is there any relief on the wheel? With no relief you will tend to create a wedge into the part.

Are you reciprocating or trying to push thru all at once?
 
Well , I also contacted the importer of the machine and blade.
They emailed me the blade wasn`t coarse enough and was filling up quickly.
That explained the heat and wandering.

Also , what worked really well was sawing the piece of Al.oxide you get with a blade together with the workpiece : continous cleaning of the wheel.

At least I learned something about grinding very hard materials that day. :)
 








 
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