Friction at the tooling-workpiece interface is very important in sheet metal forming operations. Accurate knowledge of friction at such interfaces is needed for process design and analysis, numerical process simulation and validation and control of forming processes. Two physical models or friction simulators, based on the stretching of a strip around a pin, were developed to characterize sheet metal forming friction. In contrast to other test apparatus which use measurements of strain to infer friction forces, these apparatus use direct measurements of forces. Effects of strain, stretching speed, lubrication, pin radius and wrap angle on coefficient of friction were determined.
Bibliographical noteFunding Information:
This work was supported by the National Science Foundation under Award Number DDM-9022550.
- Friction measurement
- Metal forming
- Test apparatus