Precision Forging of Spiral Bevel Gears for Army Helicopters

Abstract

The objective of the project was to develop an alternate manufacturing method for spiral bevel gears used in Army helicopters. The report covers the technical description of a program to develop high velocity forging techniques to produce spiral bevel gears to pre-grind tolerances. Initial objectives were to obtain as-forged gears with .005 inches excess material on the side of each tooth for finish grinding after the heat treating. The report includes a discussion of die design parameters, the manufacturing techniques for dies, forging parameters, dimensional checks of the forged gears, machining techniques for determining as-forged geometry and macroscopic and microscopic metallurgical data showing grain flow and micro-structure. Also included is a discussion of difficulties experienced and recommendations for future investigations.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 15, 1970
Accession Number
AD0715419

Entities

People

  • Millard R. Berger

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Army Aircraft
  • Climate Change
  • Electrodes
  • Fabrication
  • Geometry
  • Grain Size
  • Heat Treatment
  • Machining
  • Manufacturing
  • Materials
  • Measurement
  • Mechanics
  • Shape
  • Spark Gaps
  • Spiral Bevel Gears
  • Teeth

Fields of Study

  • Materials science

Readers

  • Business Analytics
  • Metallurgy
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).