The Applied Research Of ASTC Technology For The Slab Continuous Casting Segments

In recent years, how to improve the automation level of the slab continuous casting machine and improving the quality of the continuous casting slab has become the development trend of slab continuous casting production. Slab continuous casting segment is the most important machine in the slab continuous casting machine system. After long-term research, applied in slab continuous casting segment, ASTC( Automatic Strand Taper Control) technology can meet the above requirements.Once applied in slab continuous casting segment, ASTC technology can achieve the following objectives:ASTC technology can achieve adjustment of the segment roll gap dynamically, can also be adjusted even if in the casting process of production. Highly reliable operation. At the end of the casting operator can adjust roll gap which matches the next round casting production in a minute quickly and accurately. Shorten the time between casting productions and improve productivity and machine availability, reduce labor costs.In combination with the ASTC technological software package, it permits a rapid and automatic adjustment of the segment roll gap, as well as online dynamic soft reduction capability and soft clamping capability. Dynamic soft reduction uses the thermal tracing model to calculate the liquidus and solidus point in the interior of the continuous casting slab,roll gap is controlled to reduce in the calculated soft reduction area dynamically, and improve the internal quality of continuous casting slab.This paper from three aspects carries out the applied research of ASTC technique for continuous casting slab segments.Selection and establish for the ASTC subcontrol system. Of segment used on various ASTC components are introduced, the new type of segment controller is introduced.Old and new communications links adopted by the ASTC subcontrol system, the practicality and advantages are compared. Several segment roll gap control schemes for the ASTC subcontrol system are described, compared and redesigned.Electrical debugging and calibration of the ASTC subcontrol control system. This part completed on the ASTC subcontrol system debugging and calibration process Settings: using the ASTC subcontrol system can adjust and test hydraulic cylinders moving for a single segment, segment roll gap changing in manual/automatic mode and independently calibration of segment roll gap.Establish and engineering practice for the ASTC control system online of slab continuous casting segment. Forming the ASTC control system online for slab continuous casting segment. ASTC software package is described, based on the advanced quality control model in the continuous casting slab. Design of PLC control system for platform, the segment roll gap monitoring and early warning in the scene of the quasi fault condition. The system sets corresponding security protection schemes for different operation levels as segment roll gap adjusting.Through the applied research of ASTC technology for slab continuous casting segments in this thesis, the ASTC control system online for slab continuous casting segment adds more excellent performance, based on the original design advantage. The tolerance of the whole system is improved, the stability of the work is also significantly promoted, it has a strong reference value compared to the current widely used ASTC technology for slab continuous casting segments.