A Negative Gap Rolling Method for Ultra-thin Metal Strips with Online Adjustable Differential Speed ​​Ratio

Abstract

Provided is a metal ultra-thin strip negative roll gap rolling method allowing the different-speed ratio to be adjusted online. The same initial value is set for the speed of an upper working roll and the speed of a lower working roll on a human-computer interface, and the adjustment step length of the different-speed ratio is set; initial tension and initial pre-pressing force are applied to a rolled piece; the upper working roll and the lower working roll are started synchronously; after the rolling speed is stable, the initial tension of the rolled piece is increased online, so that the initial tension is increased to set tension; a roll gap is pressed downwards online until rolling force reaches a set stable rolling range, and negative roll gap synchronous rolling under target rolling force is started; before rolling is finished, the speed of the upper working roll is selected to be increased or decreased online according to the rolling pass, so that the different-speed ratio is equal to one; the roll gap is lifted online, the rolling force is reduced to a pre-shutdown set range, and the set tension is reduced to the initial tension online; the upper working roll and the lower working roll are synchronously stopped at a thick area of the rolled piece, and synchronous shutdown at the thick area of the rolled piece under the rolling force in the pre-shutdown set range and the initial tension is achieved; and the steps are repeated until the rolled piece is thinned to reach a target thickness.

Description

technical field [0001] The invention belongs to the technical field of ultra-thin strip rolling, and in particular relates to a negative roll-gap rolling method for ultra-thin metal strips with online adjustable speed ratio. Background technique [0002] In recent years, with the rapid development of micro-manufacturing technology and micro-forming technology, the demand for ultra-thin strips of metals, alloys and metal matrix composites is increasing. These ultra-thin strips are widely used in the microelectronics industry, micro-manufacturing industry, and instrumentation industry and micro-electromechanical industries. [0003] The ultra-thin strips of metals, alloys and metal-based composite materials are mostly obtained by rolling, and the rolling mills used are mostly multi-roll synchronous rolling mills, and the structure of multi-roll synchronous rolling mills is relatively complicated, and its purchase, operation and maintenance costs are relatively high. The diame...

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Problems solved by technology

[0003] The ultra-thin strips of metals, alloys and metal-based composite materials are mostly obtained by rolling, and the rolling mills used are mostly multi-roll synchronous rolling mills, and the structure of multi-roll synchronous rolling mills is relatively complicated, and its purchase, operation and maintenance costs are relatively high. The diameter of the working roll of the synchronous rolling mill is small, and the production efficiency is low, and the torsional vibration of the roll is prone to occur, which will cause vibration defects on the surface of the ultra-thin strip and affect the product quality

[0004] When the traditional gear-driven asynchronous rolling mill is used to produce extremely thin strips, because the rolling mill cannot realize the on-line adjustment of the different speed ratio, the strip is easy to break when the asynchronous rolling starts and stops, and often occurs due to improper setting of the different speed ratio. In traditional asynchronous rolling, the rolling speed of the upper and lower work rolls cannot be alternated on-line, and the different stresses on the upper and lower surfaces of the rolled piece will also cause the rolled piece to curl in one direction, thus lead to shape defects

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