A Pre-straightening Method Realizing Shape Control of Medium and Heavy Plates

[0015] Example 1

[0016] In this example, a piece of ASTM A283C steel plate is selected, the size of the blank is 150mm×2150mm×1121mm, the thickness of the intermediate billet is 24.04mm, the finishing rolling is 5 passes, the finishing rolling temperature is 986~990℃, and the finishing rolling temperature is 791~760℃. The target thickness of the steel plate is 5.9mm. The height of the exit side roll of the pre-straightening machine is 0mm.

[0017] 1) Before the ASTM A283C steel plate finish rolling, the first-level setting pre-straightening machine 7 roll gap mode is selected. After the first pass of finishing mill 1, the secondary system of finishing mill 1 sends ASTM A283C steel plate PDI data to the ultra-fast cooling secondary control system (steel ID number 1210591880, billet steel type Q235B, steel plate thickness 5.9mm, steel plate width 1660mm, Steel plate length 38950mm), the ultra-fast cooling secondary control system sends the data to the pre-straightening machine 7 co

[0021] Example 2

[0022] In this example, one piece of Q550D high-strength steel is selected, the size of the billet is 220mm×2220mm×1686mm, the thickness of the intermediate billet is 58.33mm, the finish rolling is 6 passes, the finish rolling temperature is 894~901℃, and the finish rolling temperature is 830~844℃. The target thickness of the steel plate is 25.1mm. The height of the exit side roll of the pre-straightening machine is -0.3mm.

[0023] 1) Prior to finishing rolling of Q550D high-strength steel, select the secondary setting pre-leveler 7 roll gap mode. After the first pass of finishing mill 1, the secondary system of finishing mill 1 sends Q550D high-strength steel PDI data to the ultra-fast cooling secondary control system (steel ID number 0810947834, billet steel type Q550D-2, steel plate thickness 25.1mm, steel plate width 2660mm, steel plate length 12970mm), the ultra-fast cooling secondary control system sends the data to the pre-straightening machine 7 control s

[0028] Example 3

[0029] In this example, a Q420BZ15 steel plate is selected, the size of the billet is 220mm×1840mm×2091mm, the thickness of the intermediate billet is 90.09mm, the finishing rolling is 6 passes, the finishing rolling temperature is 865~860℃, and the finishing rolling temperature is 848~860℃. The target thickness is 49.8mm. The height of the exit side roll of the pre-straightening machine is 0mm.

[0030] 1) Prior to finishing rolling of Q420BZ15 steel plate, select the secondary setting pre-leveler 7 roll gap mode. After the first pass of finishing mill 1, the secondary system of finishing mill 1 sends the Q420BZ15 steel plate PDI data to the ultra-fast cooling secondary control system (steel ID number 1230663741, blank steel type Q420-3, steel plate thickness 49.8mm, steel plate width 1940mm , Steel plate length 9240mm), the ultra-fast cooling secondary control system sends the data to the pre-straightening machine 7 control system, and the pre-straightening mach