I am trying to follow all Offst theads and I remember somebody saying that in gun manufactuing he pefers old way machined parts.
This is what I found on
http://www.kinetics.com/metal/process.shtml
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Compounding Feedstock
Fine metal powders (generally <25 microns in diameter) are combined with a polymer binder system to form a feedstock suitable for injection molding. Kinetics' feedstock is compounded using specific binder and metal powder formulations to control consistency, quality, and dimensional repeatability of parts produced.
Injection Molding
While standard plastic injection molding machines and molds are used to produce MIM parts, due to the presence of the polymer binder in MIM feedstocks, mold cavities are designed approximately 20% larger than the final part size. Like plastics, MIM molds may have multiple cavities, inserts, slides, unscrewing cores, and hot runner systems. Kinetics can help you determine the most cost effective tooling approach for your application from prototype to production.
Debinding and Sintering
After molding, green parts are debound and sintered at temperatures up to 2,600°F. During debinding, the polymer binder breaks down and dissipates while the metal particles retain all of the molded features. The metal particles fuse together during sintering and the part shrinks approximately 20% to form a solid metal part.
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And It was my consern also but KnifeCenter provides convinsing (to me) write up on this matter (probably from Kershaw):
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The Latest Technology gives birth to the newest style in the Offset from Kershaw. The Offset's rugged and complex blade geometry is provided through state-of-the-art Metal Injection Molding (MIM) and hot isostatic pressing. It's a technique Kershaw calls MITE-Metal Injection Technology with an Edge™. The result is a precision blade with two bevel geometries, hollow and flat, for incredible cutting power. Here's how MITE works: A blade mold is created and filled with a combination of powdered metal and binder. When it comes out of the mold, the blade is 20% larger than its finished size. The next stage of the process, sintering, removes the binder. Once it is sintered, the blade has reached its finished size and is at a density of 94%. Finally, the blade is HIPed under extreme pressure, approximately 32,000 psi, to increase the metal density to 99.7%.
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And last HIP-stage as I understand is what differs Kershaw MIM blade from generic MIM parts. This is why I finally decide to get one.
Thanks, Vassili.