Closed Gap Strip Threading Rolling Method in Double Stand Cold Rolling Mill

Abstract

The invention discloses a closed roller gap threading and rolling method for a double-rack cold-rolling mill. The control sequence of the threading process of the double-rack cold-rolling mill and the pressing-down sequence of a hydraulic pressing-down cylinder are adjusted, rolling and threading can be achieved under the closed roller gap predetermined value and belt pressure, strip steel deflection can be avoided by dynamically adjusting a pressing-down system, different roller bending force and tension are used for adjusting strip steel, and accordingly smooth closed roller gap threading and rolling of various specifications of products can be guaranteed; the lubricating and cooling effect of emulsified liquid is used for improving the rolling condition so as to lower rolling force. The method comprises the following steps that first, strip steel information is called-in or input, the production plan is made and then is sent to a computer, rolling parameters needed by rolling are obtained through a model in the computer, and the computer sends the rolling parameters to a process control VME system to be used as control parameters; second, strip steel threading is conducted, when a threading and rolling strip steel head reaches a coiling machine jaw, the length is preset, production begins according to the normal rolling sequence, and it is guaranteed that double-rack rolling stability can be achieved and the yield of the double-rack cold-rolling mill can be improved at the same time.

Description

Technical field [0001] The invention relates to the technical field of strip cold rolling equipment and technology, in particular to a double-stand cold rolling mill closed roll gap piercing and rolling method. Background technique [0002] The strip cold rolling mill technology has developed relatively fast. In the existing technology, a double-stand cold rolling mill has appeared on the basis of a single-stand cold rolling mill and a five-stand cold tandem rolling. The manufacturing process technology uses some experience in single-stand and continuous rolling mills. Due to the high rolling efficiency of the double-stand cold rolling mill and the flexibility of the double-stand rolling mill than other types of cold rolling mills, it is widely used. However, the disadvantages are: Due to the restriction of the production process in the prior art, the yield rate of the rolled products of the double-stand cold rolling mill is low. Since the double-stand cold rolling mill is lower ...

AI Technical Summary

Problems solved by technology

[0002] The strip steel cold rolling mill technology develops relatively fast. In the existing technology, on the basis of single-stand cold rolling mill and five-stand cold tandem rolling mill, a double-stand cold rolling mill appears. The manufacturing process technology uses some experience of single-stand and continuous rolling mills. Due to the high rolling efficiency of double-stand cold rolling mills and the flexibility of other types of cold-rolling mills, double-stand rolling mills are widely used, but the disadvantages are: Due to the restriction of the production process in the prior art, the yield rate of the rolled product of the double-stand cold rolling mill is low, and because the double-stand cold rolling mill is lower than other types of rolling mills, the use and manufacturing costs are increased, especially The production of steel is a large-scale production method, which reduces production efficiency and benefits

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