Not 3-D printing, but interesting...
Thanks. Outside of a couple newsletters and websites, I get most of my technical news from FR.
Thanks for this.
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.
The interesting twist is you could weld dissimilar metals and apparently it works without de-laminating of the different alloys...
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.
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.
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.