Method for setting in-furnace tension of continuous annealing unit on line

Abstract

The invention relates to a method for setting the in-furnace tension of a continuous annealing unit on line. The method comprises the following steps of: collecting the equipment structural characteristic influence coefficient and the sectional influence coefficient of a continuous annealing furnace and the furnace roller diameter of each section of the continuous annealing furnace; calculating a model coefficient in consideration of the influences of deviation, buckling and plate shape; calculating a preset value of the in-furnace tension of the continuous annealing unit; and putting the set value Tactmi of the in-furnace tension of the continuous annealing unit into the operation of the unit so as to finish the steps of setting the tension on line and the like. The method mainly has the advantages that: (1) by adopting a tension optimization model, the type and the specification of steel and the influence of the plate shape of an actually-supplied material are considered, namely one more dimension is considered; (2) actual equipment characteristics and an annealing process regulation can be completely combined by the tension model; and (3) in consideration of the problem of the comprehensive treatment of thermal buckling and deviation, the tension model is more flexible and more practical than a fixed table, and the model is simple and can be applied on line.

Description

technical field [0001] The invention relates to a continuous annealing production technology, in particular to an online tension setting method in a furnace of a continuous annealing unit. Background technique [0002] Annealing plays an important role in the production of cold-rolled strip steel, but initially cold-rolled strips mainly used intermittent bell annealing. Since the 1980s, due to the adoption of technologies such as rapid heating, high-temperature annealing, rapid cooling, and overaging treatment, the four processes of cleaning, annealing, smoothing, and finishing can be combined into one, at a lower cost. Products with good flatness, uniform performance and high surface cleanliness can be produced under the condition of continuous annealing, and continuous annealing has gradually developed. At present, more than a dozen countries in the world have continuous withdrawal lines, including 19 in Japan and 10 in South Korea. attached figure 1 It is a schematic d...

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Problems solved by technology

The tension setting only depends on the steel type and specification, without considering the influence of incoming factors on the tension setting

In fact, even for strips of the same steel type and specification, the actual shape of different steel coils is different, and the difference is often very large, and there is even a transition from large side waves to large and medium waves. Using the same tension setting value is obviously unfavorable to the stability of the plate

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