Powder Metallurgy Forged Gear Development

reportActive / Technical Report | Accession Number: ADA153479 | Open PDF

Abstract:

The purpose of this project to investigate and develop powder forging methods for producing high-performance gears from sintered performs. Three gears have been forged from grade 4600 steel powder to which sufficient graphite was added to achieve the desired final carbon level. The first gear, referred to as the NASA test gear because it was designed specifically for gear testing at NASA Lewis Research Center, was forged from 4620 and 4640 steel powder preforms. This gear was a straight spur gear with 28 involute teeth, a 0.25 inch-6.35 mm thick web, and a top and bottom hub. Both net teeth and oversize teeth 0.004 inches grinding stock per side were forged, with these gears being carburized after forging. Gears were then tested in a four square gear testing rig at NASA under the guidance of Dennis Townsend. Using a maximum Hertzian stress of 248, 000 psi at pitch line and a gear rotational speed of 10,000 rpm, gear lives were obtained for these gears. Additional keywords Cold isostatic pressing Die design Computer aided design.

Author(s):
Ro, D. H. ; Ferguson, B. L. ; Pillay, S. ; Ostberg, D. T.
Author Organization(s):
TRW AIRCRAFT COMPONENTS GROUP CLEVELANDOH MATERIALS AND MANUFACTURING TECHNOLOGY CENTER
Descriptive Note:
Rept. for Sep 1980-Jul 1984
Pagination:
0123

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TACOM-TR-13046
Contract/Grant Number(s):
DAAE07-80-C-9115
Monitor Series:
TR-13046, TACOM
 Subject Terms
Joint Capability Areas:
JCA_1_Force Support; JCA_5_Command and Control; JCA_4.2_Supply; JCA_4.2.3_Manage Global Supplier Networks; JCA_1.2_Force Preparation; JCA_5.3_Planning; JCA_3.2_Engagement; JCA_3_Force Application; JCA_6_Net Centric; JCA_1.2.6_Concepts; JCA_3.2.1_Kinetic Means; JCA_1.3_Human Capital Management; JCA_6.1.1_Wired Transmission; JCA_6.1.3_Switching and Routing; JCA_1.2.3_Educating; JCA_1.3.2_Personnel Management; JCA_6.1_Information Transport; JCA_1.2.5_Lessons Learned
Communities of Interest:
Space
Descriptor(s):
*FORGING, *GEARS, *POWDER METALS, *CARBON STEELS, METHODOLOGY, THICKNESS, LOW TEMPERATURE, PITCH(MOTION), COMPUTER AIDED DESIGN, POWDERS, TEST METHODS, GRAPHITE, ISOSTATIC PRESSING, TEST EQUIPMENT, RESEARCH FACILITIES, CARBON, DIES, HUBS, BOTTOM, GRINDING, SINTERING, TEETH, GEAR TEETH, WEBS(SHEETS), CARBURIZING, COLD WORKING
Field(s)/Group(s):
Metallurgy and Metallography, Fabrication Metallurgy, Machinery and Tools
Keyword(s):
COLD ISOSTATIC PRESSING, SPUR GEARS, STEEL 4620, STEEL 4660, LPN MMT 4795083
Report Date:
1985 Mar 01