PRINCIPLES OF INCREMENTAL FORGING.
Final rept. 1 Jan 69-31 May 70,
ILLINOIS UNIV CHICAGO DEPT OF MATERIALS ENGINEERING
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Plasticine, lead and commercial purity aluminum were demonstrated to be suitable room temperature analog materials for the simulation of hot forging materials such as alloy steels and titanium alloys in axially symmetric upsetting experiments with material overhang. The commercial purity aluminum provided the best combination of reproducible deformation behavior, uniform elongation, availability and cost and was predominantly used as the workpiece material throughout the program. Incremental forging of a thin web-tall rib configuration was successfully performed when side-acting rams cooperating with the main vertical anvils were incorporated into the process. Forgings with central cross ribs as well as side ribs have been formed with this technique. When vertical anvils were used alone, either the rib height was substantially reduced or material in the web section was simply pushed back and forth as successive indentations were taken. To obtain a more basic understanding of truly free deformation of the rib section, a number of systematic experiments were conducted with a single plane strain indentation in the workpiece. The length of the anvil relative to the instantaneous workpiece height and the rib thickness were found to be primary factors influencing both the mode of deformation of the rib and the indentation pressure. Author
- Fabrication Metallurgy