Measurement and control technology of the size for large hot forgings

• A size measurement and control method of large hot forging is proposed.
• The measurement requirements of the different type forgings can be achieved.
• The scanning measurement model is solved according to optical center motion trail.
• The size control of the forging is came true.
• The system verification on regular and irregular forgings is done.

Aiming at the different characteristics and measurement requirements of large hot forgings, a size measurement and control method is proposed. For irregular forgings, a measurement model based on line laser scanning is first constructed and then a solution of the optical center motion trail on the basis of the chessboard reference plane is proposed. The motion trail is solved according to the feature point coordinates on the reference plane in different frames. The overall three-dimensional size is finally achieved by combining the measurement model with the optical center motion trail. In addition, for regular forgings, under the guidance of images obtained by CCD, the two-dimensional size can be achieved according to the displacement of the line laser along the rail. Moreover, the size control of the forgings can be realized by rolling reduction control and the working position location. The measuring method proposed is feasible according to the experimental results.