An optical non-contact measurement method for hot-state size of cylindrical shell forging

Using the present method the inner diameter cannot be measured. So an optical non-contact measurement method for measuring inner and outer diameters of cylindrical shell forgings is proposed. Firstly, an infrared dual-color temperature measurement system is devised based on the three-level interference filter. Secondly, the relationship between temperature and size is derived. Using this relationship the inner diameter is measured by combining the outer diameter and temperature. The outer diameter is measured by laser scanning technology and the temperature is measured by infrared temperature measurement technology. Thereby the measurement for hot-state size of cylindrical shell forging is achieved. Finally, the measuring method is feasible according to the experimental result.

► An optical non-contact measurement method is proposed in this paper.
► The size of cylindrical shell forgings can be measured using this method.
► The relationship of temperature and size is established.
► The bottleneck problem of large forging produced is solved.