sintered metal-Let´s Talk Economics: Powder Metals - Solid Relations

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Expert Author Quintin I Goynes

powder metallurgy is a precision metal forming technology that is a part of the economic breakthrough for today´s manufacturers。 The concept implies the manufacturing of parts--net to near-net shape--and is preferred to by manufactured gear makers。

powder metals and Manufacturers

Powder metal (P/M) and gear makers have established a solid relationship。 This particular type of technology continues to advance as an enhancement to density and strength。 According to sources， major automakers are increasing their usage of this product， which is used in transmissions and engines (as gears)。 And with the use of new high speed steel alloy cutting tools， gears are being produced。

Frankly， gear performance characteristics are based on the required surface hardness； core hardiness； hardness profile； grade of steel/micro-structure of steel； and residual stress distribution。 Today， metal industry enthusiasts claim that most of today´s P/M gear capabilities are adequatesintered metal， in relation to shape complexities and tolerance； however， they tend to ´fall short´ on hardiness。

Heavy Density

Heavy density is what gear makers are after。 ´Near-fully´ dense P/M products: the part as less than 1% residual porosity or emptiness within its structure。 The four most effective methods of compacting are powder forging， isostatic pressing， metal injection， and spray forming。 And with powder forging， a work-piece is pressed into shape (preform)。 Then， the same piece is sintered， placed into a forge， and re-struck until fully compacted into the designed shape。 More steps may be added to suit。

Chiefly， this particular method has become popular for producing a lot of powder metal steel products that possess ´wrought´ steel properties-gears。 Ideally， a ´solid´ metal part structure provides a smooth surface that is free of voids， cracks， notches， and porous activity； while improving heat treating conditions-exhibiting enhancing gear characteristics: bending fatigue strength， impact strength， durability and endurance levels-powder metal production。