Drill versus Metal- Japanese TV
Drill versus Metal- Japanese TV
(OP)
This a regular event between reputable manufacturer. I am still searching for the video but basically from I saw its was a tungsten carbide drill versus a non-composite metal plate. 2 hours after starting with copious amounts of coolant, the drill break through without splitting the metal. Does a challenge like this serve any purpose? Maybe frustrating bank robbers but they'd use plasma or water cutting- not wait two hours to cut into a safe and it was fully enclosed and automated drill- not a portable device.
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RE: Drill versus Metal- Japanese TV
I'm wondering what material was being cut in the show you watched. .. because I'm having a hard time imagining carbide taking two hours to cut through a reasonable thickness of anything that it can scratch.
Mike Halloran
Pembroke Pines, FL, USA
RE: Drill versus Metal- Japanese TV
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RE: Drill versus Metal- Japanese TV
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RE: Drill versus Metal- Japanese TV
The square workpiece that shatters as they press a (possibly nonrotating) rod into it is probably tungsten carbide. It's rather glass-like under load, especially any situation that stresses it in tension.
Most of the fuss in the film seems to be about some grinding pins that they use to plunge into the carbide (while they are rotating) to make blind holes.
The pins are unusual in several respects. The film shows, briefly, a plunge EDM machine cutting one of the paraxial holes that are then filled with ... something. There are also radial holes, also filled with ... something.
I'm not clear on the function of the paraxial holes (except the center one) or the radial holes. Note that they are not visible in the finished product, which has been coated with abrasive (probably diamond) flakes.
I'm a little puzzled about the core material.
The abrasive flakes could be 'set' individually, as is common in diamond tooling, if the pins are somewhat ductile, like steel. But then there would be no reason to EDM the axial and radial holes for the ... dampers?
Anyway, yes it could take and hour or two to plunge a hole through a piece of carbide with a grinding pin. They are definitely not hogging those holes with carbide cutting tools.
Mike Halloran
Pembroke Pines, FL, USA
RE: Drill versus Metal- Japanese TV
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RE: Drill versus Metal- Japanese TV
I'm very curious about those inserted radial and paraxial whatevers that are concealed by the abrasive in the finished product. I'm guessing they improve vibration response, or heat transfer, or ... something. Maybe they'll hit the market here and get some English copy so we can find out what all the fuss is about.
Improvements to individual devices produce evolutionary changes in a wider scope of products only after they are published or otherwise revealed.
Example:
When Mark Donohue was racing Camaros for Roger Penske, they were going to a lot of trouble to fit the door glass nearly flush to the body. ... and winning races. Flush-ish door glass didn't make it into production cars until decades later; now it's almost universal.
I'm also convinced that the beautiful metallic blue paint on Penske's Camaros was really just a thin wash, applied fresh every week, after heavily sanding the entire exterior of the car whether it had been damaged or not, so not only did they save weight by not using primer or multiple coats of paint, but the body panels got progressively thinner and lighter as the season wore on.
Mike Halloran
Pembroke Pines, FL, USA
RE: Drill versus Metal- Japanese TV
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RE: Drill versus Metal- Japanese TV
"Irregular hard precipitates" is a halfway decent description of tungsten carbide, which actually comprises very small particles of tungsten carbide in a metallic binder, e.g. (I think) nickel and/or cobalt.
It is very definitely not machinable in any normal sense, and must be shaped by grinding, with a really really hard grit, like diamond.
The film seems to be a publicity piece for a new type of abrasive grinding pin.
Any improvement in the cost and/or speed capability of such abrasive tools is of great commercial importance, not just in production of carbide parts, but in production of things like ceramic knives and ceramic armor.
Mike Halloran
Pembroke Pines, FL, USA
RE: Drill versus Metal- Japanese TV
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RE: Drill versus Metal- Japanese TV
WC is even harder, but I'm not sure it's even possible to produce it in sheet/plate/bulk form.
All of the 'WC' I've ever heard of or worked with is really WC powder in some kind of matrix.
Mike Halloran
Pembroke Pines, FL, USA
RE: Drill versus Metal- Japanese TV
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli