Real-time control for a straightening process using a six-roll bending configuration is proposed. The crookedness of workpieces is caused by variations in processing conditions, handling, and so on. The proposed solution for real-time closed-loop control of the straightening process is to have the machine measure the central roller force and displacement during the early part of the reverse bending cycle and 'learn' the material properties. The workpiece characteristics in bending are expressed as a moment-curvature relationship that is used to predict the workpiece shape and springback properties. An algorithm for real time unloaded shape control using estimates of loaded curvature, bending moment, and the stiffness of the material is proposed. As a result, a prediction of unloaded curvature can be made, and a closed-loop control system for straightening initially bent shapes can be designed.
|Original language||English (US)|
|Number of pages||14|
|State||Published - Dec 1 1984|