| At present our country is in the transition from big country of steel to superpower country of steel, and steel industry is also in the deep structure adjustment stage. Wide and Heavy plate has become the main point of development because it is high value-added. Straightening machine is commonly used and important equipment in metallurgical industry and the process of straightening is indispensable important process on plate production. The design method of straighter universal spindle and online torque monitoring model are problems not perfect solved always. Although many people have done experiment and research in design method theory and calculation model, so far no definitive one. It is very difficult to guarantee the working reliability of straighter universal spindle. So there must be some methods and devices that can real-time monitoring its torque changes and make corresponding feedback control to these changes, guaranteeing the safety and reliability of the straightening equipment.This topic take"11 roller full hydraulic powerful straighter"a steel mill as the experimental platform. Based on Straightening theory and plate plastic deformation mechanism, this thesis study straightening plate transmission torque real-time change state and laws of 11 roller heat treatment full hydraulic straighter to design and manufacture a set of experimental device. Combined with experiments data from 11 roller heat treatment full hydraulic straighter in WuYang, we guided and adjust field transmission torque to achieve control the production and improve the purpose of flatness. The conclusions as follows:(1) This thesis analyzes elastic-plastic bending deformation theory, quote"virtual fulcrum"concept , establish new mechanics model of roll straightening machine force parameter calculation and derive corresponding mathematical formulas.(2) This thesis analyzes the necessity of plate straightening machine lord transmission system torque on-line monitoring, expound torque measuring principle and monitoring system and working principle of the composition, and explain monitoring system software on figuration and the role of the functional modules. The system has very important theoretical and realistic significance on ensure safe operation of straightening machine lord transmission system and reduce accidents and the cause of the accident search.(3) This thesis expiores an online observation method of the rolled-piece yield strength. We can real time observation plate straightening process yield strength, and determine the coherence with heoretical modle by program through this mehod.If yield strength is not correspond to theoretical mode, then the program will corresponding adjustment straightening technology and preal-time automatic compensate straightening roll gap.(3) This thesis combines FEM simulation with the experimental measurement. The thesis explored the intensity and rigidity in two work condition that prestressed frame in preloaded and straightening. The thesis points out the steel and cast steel straightening bite the impact of the stress is the effect of the straightener carrying capacity of the main factor. Impact of straightening roll gap caused changes thus influence plate. It is the main reason for straightness of straighter structure design and use of significant.In short, we can build a more reasonable transmission torque calculation and control model through this topic research, which is beneficial to formulate more reasonable straightening technology parameters to improve the quality of the straightening. This topic of the research is a technical problem that the current steel enterprise and steel equipment manufacture enterprise encountered. It can provide enterprises with reliable technical support for more advanced production and high degree of automation straightener provides conditions... |
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