In order to improve economic benefit,we should control the dimension of the material;improve the ratio of the fixed length and finish.

Based on the process control and requirement of the continuous casting machine(CCM),with the PLC control system,full automatic cntrol of cut-to-length was realized by combining cutting technology of the flames cutter machine with manipulating the imagines to length of steel billet by untouched-mode.

The technology of using image analysis and pattern recognition to implement the non-touching automatic billet cut-to-length is mainly introduced.

5 continuous caster at the Steelworks by heavier interference of flame cutting to infrared non-contact cut-to-length system and not high enough cutting precision,the PLC cut-to-length system was developed,satisfactorily solving the cut-to-length problem.

On the basis of the studies on the effect of hot-centering machine on the production of hot-rolled seamless tubes and the advantages and disadvantages of several types of the present hot-centering machine, A new type of hot-centering machine was designed by ourselves which could realize the length and centre and could centre simultaneously at the head and the end.