Control method for periodic variable-thickness strip rolling speed

Abstract

The invention discloses a control method for a periodic variable-thickness strip rolling speed, and belongs to the technical field of rolling. The control method comprises horizontal rolling speed control and the vertical rolling speed control of a roller, wherein the horizontal rolling speed control is performed in a way that: a thick region of a strip is rolled at a thick region rolling speed; the rolling speed starts to decrease at a near point A of a transition region and decreases to VB at a starting point B of the transition region; at the transition region, the horizontal rolling speed at the transition region is calculated according to a transition region curvilinear equation and a second flow equivalence principle; and the rolling speed starts to increase after an end point C of the transition region and increases to a thin region rolling speed at a far point D of the transition point to start to roll a thin region; the vertical rolling speed control of the roller is performed in the way that: the vertical rolling speed of the roller is 0 when the thick region of the strip is rolled; after the thick region is rolled and a rolled piece reaches the starting point B of the transition region, the roller starts downward pressing, and the vertical rolling speed of the transition region is Vdy(x); the Vdy(x) starts to decrease after reaching a maximum point Q1 and decreases to 0 at the end point C of the transition region; and the steps are repeated periodically.

Description

Technical field:

[0001] The invention belongs to the technical field of rolling, in particular to a method for controlling the rolling speed of a periodically variable-thickness strip. Background technique:

[0002] The rolling method is used to produce periodic variable-thickness strips, and after cross-cutting, it becomes a differential thickness plate to replace laser welded blanks; it is used as automobile stamping parts to reduce vehicle weight and realize energy saving and emission reduction of automobiles. A new rolling technology emerged. At present, the existing rolling speed control methods can not meet the requirements of thickness and length control accuracy in the periodic variable thickness strip rolling process, and it is difficult to realize the automatic control of thickness and length under the condition of variable thickness.

[0003] When rolling periodic variable thickness strips, the control of rolling speed has a crucial impact on product quality and ...

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