The Evaluation of Glasses As Forging Lubricants
Technical rept. 1 Mar-30 Sep 1970
WESTINGHOUSE ASTRONUCLEAR LAB PITTSBURGH PA
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The ring compression test was successfully used to determine the relative efficiency of a number of lubrication systems for the high temperature forging of Type 300A maraging steel and titanium -6 aluminum -4 vanadium alloy. The results clearly indicate the advantage of using both a glass coating on the workpiece and a grease-base lubricant on the tooling. Data obtained has identified the optimum temperature range for use of each of the three glass coatings evaluated. Inaccuracies in the application of theoretical analysis to practical ring test results, due to bulging occurring at high friction levels, can be minimized by using specimens of small ratios of internal diameter and thickness to external diameter. When such precautions are taken, the method of analysis used in this work allows a value for the interface shear of the lubricant system to be determined. Under thick film lubrication conditions, this value would be independent of the flow stress of the workpiece material.
- Ceramics, Refractories and Glass
- Fabrication Metallurgy
- Lubricants and Hydraulic Fluids