INVESTIGATION OF HYDROSTATIC EXTRUSION.
Abstract
Research studies were conducted to determine the feasibility of developing the hydrostatic extrusion process for producing structural shapes of large cross sections from such high-strength materials as AISI 4340 steel and Ti-6Al-4V titanium alloy. Tooling was developed to withstand internal fluid pressure up to 250,000 psi at room temperature, and up to about 225,000 psi at 500 F. The tooling accommodates billets up to 2-1/4 inches in diameter by 16 inches long. Experimental studies were made of the critical process variables such as fluids, fluid additions, billet lubricants and coatings, stem speed, die design, and billet surface finish. Developments achieved in the process led to the successful cold hydrostatic extrusion of AISI 4340 rounds at ratios up to 6:1 and Ti-6Al-4V rounds up to 4:1. The target T-section, roughly 1 x 11/16 x 1/4-inch thick, was extruded by this means at ratios up to 2.5:1 from AISI 4340 steel. Fluids and billet lubricants were found to have a very significant effect on pressure requirements. Increasing the stem speed from 1 to 6 ipm was found to decrease the stem pressure requirements in the order of 5 per cent for AISI 4340 and Ti-6Al-4V. Comparisons of pressures for hydrostatic and conventional extrusion were made from two standpoints.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0610760
Entities
People
- A. M. Sabroff
- Francis W. Boulger
- R. J. Fiorentino
Organizations
- Battelle Memorial Institute