Powder Metallurgy Forged Gear Development
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA153479
Entities
People
- B. L. Ferguson
- D. H. Ro
- D. T. Ostberg
- S. Pillay