Method and apparatus for determining the straightness of tubes and bars
US7110910B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2005 |
| Grant date | Sep 19, 2006 |
| Priority date | — |
| Expiry date | Jun 13, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B38/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for automating the measurement of straightness of linear stock material produced by the operation of a mill. As the linear stock material exits from the mill, sensors acquire a sequence of image or distance measurement pairs associated with the material at discrete longitudinal points over a segment of the material. A processing system utilizes the data pairs to determine a set of centroids for a segment of the material. A virtual axis is identified between centroids associated with the segment, and the processing system determines a measure of deviation of each remaining centroid in a segment from the virtual axis to identify a degree of concavity of the material within the segment, as well as to identify a measure of the angular orientation of the concavity about the virtual axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.