A kind of control method of tension leveler of pickling mill
A control method and technology of a tension leveler, which are applied in the rolling mill control device, metal rolling, metal rolling, etc., can solve the problems of insufficient tension leveling rate, economic loss, sudden change of tension leveling machine, etc. The effect of reducing the poor scale breaking effect, ensuring normal pickling, and avoiding belt breakage accidents
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Embodiment 1
[0025] Example 1: steel coil A grade DC04, yield strength 240-280MPa, raw material width 1328mm, raw material thickness 3.4mm; steel coil B grade DC01, yield strength 310-330MPa, raw material width 1236mm, raw material thickness 2.75mm; steel coil A and Steel coil B is welded; when producing steel coil A, the parameter setting of the tension leveler adopts the setting method of "small elongation, large meshing amount", and the elongation rate is automatically set to 2.3%~2.5%, and the meshing amount is 30 mm~ 35mm; when the weld seam of steel coil A and steel coil B passes through the tension leveler, because the thickness deviation of steel coil A and steel coil B is 3.4mm-2.75mm=0.65mm, the weld seam pass tension leveler mode is automatically selected as welding Seam over tension leveling machine mode 2, set the bending and straightening unit to be in critical contact with the strip, but not pressed down, the meshing amount of the bending unit of the tension leveling machine ...
Embodiment 2
[0026] Example 2: steel coil C grade HC210IF, yield strength 380-400MPa, raw material width 1245mm, raw material thickness 4.2mm; steel coil D grade HC340 / 590DP, yield strength 510-530MPa, raw material width 1267mm, raw material thickness 3.1mm; steel coil C and steel coil D are welded; when producing steel coil C, the parameter setting of the tension leveler adopts the setting method of "small elongation and large meshing amount", and the elongation rate is automatically set at 1.8% to 2.2%, and the meshing amount is 36 mm~40mm; when the weld seam of steel coil C and steel coil D passes through the tension leveler, because the thickness deviation of steel coil C and steel coil D is 4.2mm-3.1mm=1.1mm, and the welding seam cupping test is qualified, it is proved The quality of the weld seam is good. At this time, the mode of the weld seam tension leveler is automatically selected as the weld seam tension leveler mode 3, and the elongation of the weld is set to 0 (no elongation) ...
Embodiment 3
[0027] Example 3: Steel coil E grade HC300LA, yield strength 520-540MPa, raw material width 1243mm, raw material thickness 2.75mm; steel coil F grade DX53D+Z, yield strength 240-270MPa, raw material width 1238mm, raw material thickness 2.8mm; steel coil E and steel coil F are welded; when producing steel coil E, the parameter setting of the tension leveler adopts the setting method of "small elongation, large meshing amount", and the elongation rate is automatically set at 0.5% to 1.2%, and the meshing amount is 41 mm ~ 42mm; when the weld seam of steel coil E and steel coil F passes through the tension leveler, because the thickness deviation of steel coil C and steel coil D is 2.8mm-2.75mm=0.05mm, the width deviation is 1243mm-1238mm=5mm, None of them meet the conditions of welding seam over tension leveling machine mode 2 and weld seam over tension leveling machine mode 3, the thickness difference between the front and back strips is <0.3mm or the width difference is <100mm,...
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