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Near net shape manufacturing.
1 posted on 12/18/2012 3:42:23 PM PST by null and void
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To: AD from SpringBay; al_c; AnalogReigns; archy; bmwcyle; Boogieman; bigbob; BuffaloJack; capt B; ...

Not 3-D printing, but interesting...


2 posted on 12/18/2012 3:43:21 PM PST by null and void (Going Galt: The won't of the people)
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To: null and void

Thanks. Outside of a couple newsletters and websites, I get most of my technical news from FR.


3 posted on 12/18/2012 3:56:11 PM PST by Cold Heart
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To: null and void

Thanks for this.


4 posted on 12/18/2012 4:00:42 PM PST by ColoCdn (Neco eos omnes, Deus suos agnoset)
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To: null and void

I operated a small plastics injection molding company back in the 70s, but had never heard of MIM.
I just looked it up on Wikipedia and see that they use the same plastics injection machines, but use metal powder added to a wax or plastic.
They later burn off the plastic.


5 posted on 12/18/2012 4:09:11 PM PST by AlexW
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To: null and void
There is a relatively new process of which I can't remember the proper name. It is essentially a CNC machine if you will with a welding rod instead of a cutter and builds the part as you go. So you could make a crankshaft and it would be a total weldup and only some finish machine is needed. Apparently they are using it for major fuselage bulkheads in some of our fighter aircraft.

The interesting twist is you could weld dissimilar metals and apparently it works without de-laminating of the different alloys...

6 posted on 12/18/2012 4:09:36 PM PST by taildragger (( Tighten the 5 point harness and brace for Impact Freepers, ya know it's coming..... ))
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To: null and void

Very interesting to say the least!
One gigantic question, with China’s dismal manufacturing quality record, are they going to be the “go to” place for MIM? I can see China parts returning to powder because they substitued a proven binder or pressure for something saving less than a fraction of 1 Cent per unit.


8 posted on 12/18/2012 4:13:08 PM PST by X-spurt (Ted Cruz for President of the Republic of Texas)
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To: null and void

MIM is huge in firearms lockwork parts. S&W revolvers now have their hammers, triggers, rebound housing, cylinder stop are all made from MIM. Their springs are still conventional - coil springs and a flat spring. The hand looks like tool steel or some such.

Ruger uses a lot of investment casting for their frames, but I think the guts are MIM’ed.

The nice thing about MIM is that you get so close to your finished size and finish, it is quite remarkable. No machining marks at all.


13 posted on 12/18/2012 5:44:56 PM PST by NVDave
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To: null and void

Oh, and 4140, 17-4PH and 420 are all used in firearms manufacturing.

I just finished a barrel made from 420. Polished up very, very nicely. Better than 416, I think.


14 posted on 12/18/2012 5:46:26 PM PST by NVDave
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