Cause analysis and improvement measures of head folding defect of hot rolled thin gauge strip
Aiming at the problem that the thin gauge strip head is prone to warping during the threading at the pinch rolls in the hot rolled strip endless rolling production line,resulting in strip head folding defect after coiling,the causes of strip head fold-ing defects are analyzed from the aspects of equipment structure,steel grade and thickness gauge of strip,and targeted im-provement measures are proposed.The results show that affected by technology and equipment structure of the production line,the strip is prone to warping due to impacting guide plate when threading through the 1# pinch roll,and the strip head is pressed against the 2# pinch roll and causes folding.The severity of folding defects is influenced by the steel grade and thickness gauge of strip,thin gauge and low strength strip are prone to defects and even causing steel stacking accident.By taking measures such as development of pinch roll eccentricity function,reforming the anti-flying device,optimizing the equipment's percentage over-speed,the folding defect of the strip head has been effectively improved,and the defect occurrence rate has been reduced from 15％to 1％.
endless rollingstrip head folding defectpinch rolleccentricparameter optimization
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