Optimization of microstructure during deformation processing using control theory principles
- Wright Lab., Wright Patterson AFB, OH (United States). Materials Directorate
- Wright State Univ., Dayton, OH (United States). Dept. of Mechanical and Materials Engineering
The development of optimal design and control methods for manufacturing processes is needed for effectively reducing part cost, improving part delivery schedules and producing specified part quality on a repeatable basis. A new strategy for systematically calculating near optimal control parameters for hot deformation processes for microstructural control is presented in this communication. This approach is based on modern control theory and involves developing state-space models from available material behavior and hot deformation process models. The control system design consists of two basic stages and analysis and optimization are critical in both stages. In the first stage, the kinetics of certain dynamic microstructural behavior and the intrinsic hot workability of the material are used, along with an appropriately chosen optimality criterion, to calculate optimum strain, strain-rate, and temperature trajectories for processing. A suitable process simulation model is then used in the second stage to calculate process control parameters, such as ram velocity, die profiles and billet temperature, which approximately achieve the strain, strain-rate, and temperate trajectories calculated in the first stage at selected areas of the workpiece. The validity of this approach has been demonstrated with an example on hot extrusion of steel.
- OSTI ID:
- 438614
- Journal Information:
- Scripta Materialia, Vol. 36, Issue 3; Other Information: PBD: 1 Feb 1997
- Country of Publication:
- United States
- Language:
- English
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