DEVELOPMENT OF DIES FOR EXTRUSION OF COMPLEX SHAPES OF STEEL AND REFRACTORY ALLOYS.
Abstract
The utility of massive ceramic dies for the precision high temperature extrusion of complex shapes of refractory metal alloys has been demonstrated. Precision extrusion of shaped structural steels through ceramic coated dies was gained by refinement and close control of extrusion parameters. Refractory ceramics of high compression strength like ZrO2 or TiC were found capable of extruding TZM molybdenum alloy at 3700F and 75 tsi producing 2.0 by 1.3 by 0.250 inch Tee sections in lengths up to at least fourteen feet with dimensional runout of less than three mils and surface smoothness of 63 rms. Ceramic coated dies, like Al203 coated tool steel, were found capable of extruding 4340 alloy steel at 2300F and about 50 tsi, producing 2.0 by 1.5 by 0.062 inch Tee sections in lengths up to at least forty feet with dimensional runout of less than four mils and surface smoothness of 125 rms. The performance of massive ceramic dies in TZM extrusion indicates that massive ceramic dies would produce steel extrusions superior to those obtained with ceramic coated steel dies. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 25, 1964
- Accession Number
- AD0608497
Entities
People
- J. G. Hunt
- J. L. Klein
- J. M. Siergiej