Precision Forgings

A PM preform could be made using recently developed prealloyed steel powders, and full densification could be achieved by hot precision forging to final configurations after the sintering operation... 

Which hot-forming technique to select for a given workpiece from a low-cost manufacturing viewpoint depends mainly on the part quantity and the extent to which the forming part is similar to the finished shape. In precision forging, where the forming part can be better approximated to the finished... 

Eigure 22 Precision Forging of a Steering Swivel (hot forged, simultaneously deburred, pierced and hot cahbrated, weight 8.8 kg, material 41Cr4). (From Adlof 1995)... 

Hot-formed components, 568, 581-585 axial die rolling, 584 extrusion, 582-584 precision forging, 581-583 Hot isostatic pressing (HIP), 572—574 Hot standby, 1933... 

PPA (Pollution Prevention Act), 1164 PPOs (preferred provider organizations), 738 Practice-based team training, 934 Precision forging, 581-583, 1317 Precision mechanics, 365 Predatory pricing, 681 Predetermined time standards (PTS), 1413, 1427-1446... 

The blades for the HP compressor were made of forged semi-finished parts, which subsequently were precisely machined. The blades for the HP-turbines were made by precision forging. 

Source R. Pishko, T. Yu, and G. Kuhiman, Precision Forging of Titanium Alloy, in Triawm 1966Pirxfocfo arid Appiicafforis, Tltariium Development Association, 1987, p376... 

Machimng. Titanium alloy forgings can be machined by all commercially available traditional and nontradition (chemical) techniques. Precision forgings (and, in some cases, other forging products) are frequently chemically milled, machined, and/or surface treated (by conversion processes, painting, etc.) prior to shipment as finished components. 

Table 3 Nettitanium alloy precision forging designAoierance criteria for seiected parts and processes for metastabie p and a- aiioys...

Rg. 7 Past and future near-net and net titanium alloy precision forging capabilities gaged in terms of plan view area. This figure differentiates between net and near-net precision titanium alloy forging because not all titanium alloys are equally producible under either conventional or hot-die methods. 

The first precision forged titanium alloy products commerdally produced were turbine engine compressor and fan blades conventional forging process techniques were used. With hot-die/isother-mal forging techniques, very complex cross-section predsion forged airfi ame components are being manufactured. Titanium alloy predsion forgings are produced with very thin webs and ribs sharp comer and fillet radii imdercuts, back-draft, and/or contours and, fiequently. 

Tecdmology Development Effectiveness. As a result of both conventional and hot-die/isothermal forging technology developmental efforts, the size of the net titanium precision forging that can be fabricated to the previously listed design and tolerance criteiia (see Table 3) has tripled—fiem 0.081 m (125 in. ) to over 0.194 m (300 in. ) in terms of plan view area (see Fig. 7). The critical elements in... 

Precision forging near-net shape generation through the use of precision dies. Reduces waste and minimizes or eliminates machining. 

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