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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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tungsten carbide and heat
When I am making a tool bit out of tungsten carbide, do I have to keep it
cool? Does heat change it's hardness, or does this just apply to tempered steel? Kori |
#2
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tungsten carbide and heat
"Kori" wrote in message
... When I am making a tool bit out of tungsten carbide, do I have to keep it cool? Does heat change it's hardness, or does this just apply to tempered steel? Considering brazed carbide exists, I don't think you have to worry about that... Just don't cool it quickly (e.g. quenching) or you'll crack it. I'd guess either going full-bore or slowly with a water-cooled stone. Tim -- In the immortal words of Ned Flanders: "No foot longs!" Website @ http://webpages.charter.net/dawill/tmoranwms |
#3
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tungsten carbide and heat
What kind of heat are you talking?
Most Carbides will easily stand up to temperatures used to braze it to steel shank holders. However as with most things it won't do it any good if too much heat is applied. Gradual heating and cooling is ok. Quenching with water or compressed air may lead to cracking of carbide. If you are talking heating during grinder, you still want to avoid over heating and cooling to quickly. Kori wrote: When I am making a tool bit out of tungsten carbide, do I have to keep it cool? Does heat change it's hardness, or does this just apply to tempered steel? Kori |
#4
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tungsten carbide and heat
When I am making a tool bit out of tungsten carbide, do I have to keep it
cool? Does heat change it's hardness, or does this just apply to tempered steel? Carbide grinding should be done very wet or dry. If you have intermittent cooling thermal shock will crack it. I have had poor luck grinding brazed carbide toolbits with silicon carbide grinding(green) wheels. They cut slow and edge is pretty rough. Diamond wheels work very well. chuck |
#5
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tungsten carbide and heat
"Kori" wrote in message
... When I am making a tool bit out of tungsten carbide, do I have to keep it cool? Does heat change it's hardness, or does this just apply to tempered steel? You don't have to keep it cool. It can glow red without suffering harm. However, a brazed-on carbide tool bit will fall apart long before it gets red, because the brazing material will melt. Ed Huntress |
#6
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tungsten carbide and heat
In article , Ed Huntress wrote:
You don't have to keep it cool. It can glow red without suffering harm. However, a brazed-on carbide tool bit will fall apart long before it gets red, because the brazing material will melt. You're okay up to dark cherry, normally, unless you're using a lot of force. I sometimes have to 'unbraze' stuff, and you need a LOT of heat. Mind you, I deal with large pieces, so that's going to colour my perceptions. -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Mike Graham | Metalworker, rustic, part-time zealot. | http://www.metalmangler.com| Caledon, Ontario, Canada |
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