A constant tension control method for a small multi-stand cold rolling mill

Abstract

The invention relates to a constant tension control method for small multi-rack cold continuous rolling units. The rolling gap adjustment amount can be changed through a control module arranged corresponding to the next cold continuous rolling unit, the tension of an aluminum strip entering a cold continuous rolling unit can be effectively adjusted, so that effective adapting to the adjustment ofthe length and the conveying speed of the aluminum strip caused by the change of the rolling thickness can be realized, and the tension of the aluminum strip in the unit cross sectional area can be kept constant in the conveying process; and the conveying speed of an aluminum strip entering the front rack cold continuous rolling unit is effectively adjusted through comparison between the actual tension value and the tension reference value, and based on the requirement difference of the rolling thickness and precision of the aluminum strip, different speed regression strategies are adopted ina speed regression module, so that different speed adjustment amounts and rolling gap adjustment amounts are matched according to requirement difference of the rolling thickness and precision of the aluminum strip, and the method is wide in application range.

Description

technical field [0001] The invention relates to a control method, in particular to a constant tension control method of a small multi-stand continuous cold rolling mill. Background technique [0002] Internationally, the production technology of ultra-long and ultra-narrow aluminum strips is mainly controlled by German and American companies, and continuous rolling technology is used to realize automatic production, which requires a large investment in equipment; in China, some manufacturers have tried to use aluminum rod extrusion technology It is a precedent for the production of ultra-long and ultra-narrow aluminum strips, but it is prone to broken strips and the yield is low. Since the thickness of ultra-long and ultra-narrow aluminum strips is generally small between 0.2-0.3mm, the problem of broken aluminum strips is unavoidable in the aluminum rod extrusion process, thus limiting the application of aluminum strips in nuclear power cooling. The core problems to be sol...

AI Technical Summary

Problems solved by technology

[0003] In the continuous rolling process of aluminum strip, it is often realized by several cold tandem cold rolling units connected in series. A cold tandem cold rolling unit is rolled to a smaller thickness, at this time the aluminum strip will be stretched and the tension and transmission speed on the conveyor line will change, which will cause the aluminum strip to relax on the conveyor line and affect the feeding process. Ultimately resulting in aluminum strip rolled strength and quality

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