Online detection and control of full cross-section profile of cold-rolled silicon steel based on X-rays

High-end silicon steel imposes strict requirements on strip shape quality and transverse thickness difference precision, while traditional single-point thickness gauges fail to perform real-time detection on the full cross-section thickness profile of cold-rolled silicon steel. To address the above technical bottlenecks, an online detection and control system based on X-ray for full cross-section profile of cold-rolled silicon steel was proposed, and a three-level collaborative framework of "on-site collection-edge computing-cloud monitoring" was built in this work. A fan-beam X-ray source matched with high-resolution linear array detectors was adopted in the system. Combined with the Lambert-Beer law and multi-path reflection enhancement mechanism, synchronous thickness sampling across the entire strip width was realized. Intelligent calibration, alloy compensation and adaptive filtering algorithms were put forward, which effectively boosted the stability and precision of measured data. Quantitative calculation models for key strip shape parameters including transverse thickness difference, crown and edge drop were established, and a coordinated optimal control strategy for multiple actuators was constructed by coupling with the mill control system, realizing real-time linked adjustment between detection data and process parameters such as mill bending force. Industrial field applications show that the system delivers a thickness measurement accuracy of ±1 μm with sampling time no more than 1 ms, which realizes non-contact real-time full cross-section detection for cold-rolled silicon steel. After deployment, the qualification rate of transverse thickness difference of cold-rolled silicon steel rises from 80.74% to 93.33%, remarkably improving product quality stability and the automatic control level of production lines. This system offers core technical support for quality management of high-end cold-rolled silicon steel and bears favorable economic benefits and engineering demonstration value.