Method for controlling a process for automatically pouring molten metal, a system for controlling a servomotor of an automatic pouring apparatus, and a medium for recording programs for controlling a tilting of a ladle
US8202472B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 28, 2008 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | Mar 28, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D39/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for controlling a ladle to pour molten metal into a mold. The method comprises producing a mathematical model describing a relationship between a measured electrical voltage supplied to a servomotor for tilting the ladle and a flow rate of the molten metal flowing out of the ladle when the ladle is tilted; solving an inverse problem of the mathematical model; estimating the flow rate of the molten metal using a state observer having an exponential damping that uses an extended Kalman filter, based on the measured electrical voltage and a weight of the molten metal poured into the mold; processing the flow rate of the molten metal and a target flow rate of the molten metal with a gain-scheduled PI controller; obtaining a target electrical voltage to be supplied to the servomotor; and controlling the servomotor based on the target electrical voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.