Research On The Upgrading And Remaking Of SPM Control In Cold Strip

The thesis is based on the upgrading and transforming process of a SPM Control Unit of a cold strip factory, which was built by in 50s, by combining the technology and the experience collected from the design, installation and commissioning of the project. The factory has a transformed SPM of DC system and 2 totally new reversible mills under stable operation, which provide reliable technique support for the new transformed unit. The new transformed unit requires leading equipments and technology in the same industry, easy to maintain, low failure rate, and autonomous control system.By combining features of SPM control and the actual situation, site survey and data analysis, the lectotype, design, debugging and programming of equipments are carried out, and also the research and analysis to the applied technology. The transformed unit has been put into production. The equipments appear a good function, friendly operation and comprehensive maintenance, which increase the production ability and quality of SPM. Research content mainly includes:(1) Hardware lectotype of SPM electric control equipment, configure of PLC equipments,and the communicating junction between DP and Ethernet.(2) Install and debug the drive system, complicate the transformation from DC system to AC system, research and analyze the dynamic response of motors, and program and design the coil diameter calculation.(3) Finish the design of secondary system and HMI monitor picture, finish the data exchange between the secondary system and basic automation, and between the secondary system and the third production system, and research on computer control system mathematical model.(4) Programming design of sequential control t, and on the basis of sequential control logics, make new programs and add necessary sequential control logics with PLC language.(5) Analyze the design of frame control, analyze and research the process characteristics of the frame by combining hydraulic gap control, roll bending control and elongation control.In the end, conclusions according to research work of project and paper have been drawn; following work and research directions have been pointed out. Some research achievements in this thesis have certain instructional meaning and reference value to future in Smooth Pass.