HIGH TEMPERATURE MACHINING METHODS
Abstract
Hot machining can reduce the cost of manufacturing part from many high strength steels, precipitation hardening stainless steel, and nickel and cobalt based alloys. Selection of parts with suitable materials, and proper planning of set-up and sequence of operations, materially influences the final cost. Manufacturing costs of aerospace parts when hot machined from heat treated AlSI 4340 and Ph 15-7 Mo steels were reduced up to 36% when compared to conventional machining. Radio-frequency induction and resistance heating techniques were developed and proved practical for heating magnetic materials. while the inert tungsten arc torch was more satisfactory for non-magnetic materials. Most high strength metals will show a significant increase in tool life and permissible metal removal rates at elevated temperatures. Hot machining of 6 Al 4 V, 13 V 11 Cr 3 Al titanium alloys and refractory metals and alloys, achieved only limited success. While some metallurgical changes were observed on the hot machined nickel and cobalt based alloys, these changes were not severe or extensive.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 23, 1963
- Accession Number
- AD0401303
Entities
People
- Clarence L. Mehl
- Irving A. Dickter
- Russell F. Henke