Automatic Control Method of Strip Width in Hot Continuous Rolling Finishing

Abstract

The invention relates to the field of strip steel hot rolling, in particular to a control method of the width of hot rolling strip steel. An automatic control method of the width of hot continuous rolling and finish rolling strip steel comprises the steps as follows: a temperature change model of the strip steel in a finish rolling process is built, sensitivity coefficients are calculated, and temperature reference values of the strip steel at rack outlets are calculated; temperature modification values of the strip steel at the rack outlets are calculated, and temperature prediction values are obtained in combination of the temperature reference values and the temperature modification values; real-time change values of the width of the strip steel are calculated; feedback deviation values of the width of the strip steel are obtained through comparison, and the feedback deviation values are distributed to racks, so that feedback deviation values of the width of the strip steel, which are required to be adjusted by the racks, are obtained; and tension of loops among the racks are adjusted in combination of the real-time change values of the width of the strip steel and the feedback deviation values of the width of the strip steel, so that the width of the steel strip is controlled. The method can well guarantee that the width of the strip steel after finish rolling can fluctuate nearby set values, the width accuracy of a strip product is finally improved, and accordingly, the utilization rate of a material by a downstream user is remarkably increased.

Description

technical field

[0001] The invention relates to the field of strip hot rolling, in particular to a method for controlling the width of a hot strip. Background technique

[0002] The finished width accuracy of hot-rolled strip steel is a very important technical index. For hot-rolled production, the quality of width accuracy directly affects the success rate of strip steel; for downstream users, it directly affects the raw material quality. utilization rate. Every time the width deviation is reduced by 1 mm, the yield can be increased by about 0.1% based on the actual finished strip width. Therefore, high-precision width control technology can significantly improve economic benefits.

[0003] In the traditional sense, the equipment and technology of strip width control are mainly concentrated in the roughing mill. The width control equipment in the rough rolling area is mainly a powerful large vertical roll mill. The control method mainly includes (1) automatic control of t...

Examples

Embodiment 1

[0071] Such as figure 1 As shown, the hot continuous rolling finishing system usually has seven stands, that is, the 1st to 7th stands 11 to 17, and the strip width prediction module is set at the exit of the first 6 stands, that is, the 1st to 6th strip Width prediction modules 51~56; a looper is set between two adjacent racks, and there are 1st~6th loopers 21~26 in total, and each looper is independently equipped with a tension adjustment module, that is, the 1st~6th Tension adjustment modules 41~46, the rough rolling area 9 before the hot continuous rolling and finishing rolling system, the inlet pyrometer 30 and the vertical roll 10 before finishing rolling are installed at the entrance of the hot continuous rolling and finishing rolling system, and the exit of the hot continuous rolling and finishing rolling system There is a width measuring instrument 31 and an outlet pyrometer 32, the width measuring instrument 31 is connected with the tension adjustment module through ...

technical field

[0001] The invention relates to the field of strip hot rolling, in particular to a method for controlling the width of a hot strip. Background technique

[0002] The finished width accuracy of hot-rolled strip steel is a very important technical index. For hot-rolled production, the quality of width accuracy directly affects the success rate of strip steel; for downstream users, it directly affects the raw material quality. utilization rate. Every time the width deviation is reduced by 1 mm, the yield can be increased by about 0.1% based on the actual finished strip width. Therefore, high-precision width control technology can significantly improve economic benefits.

[0003] In the traditional sense, the equipment and technology of strip width control are mainly concentrated in the roughing mill. The width control equipment in the rough rolling area is mainly a powerful large vertical roll mill. The control method mainly includes (1) automatic control of t...

Examples

Embodiment 1

[0071] Such as figure 1 As shown, the hot continuous rolling finishing system usually has seven stands, that is, the 1st to 7th stands 11 to 17, and the strip width prediction module is set at the exit of the first 6 stands, that is, the 1st to 6th strip Width prediction modules 51~56; a looper is set between two adjacent racks, and there are 1st~6th loopers 21~26 in total, and each looper is independently equipped with a tension adjustment module, that is, the 1st~6th Tension adjustment modules 41~46, the rough rolling area 9 before the hot continuous rolling and finishing rolling system, the inlet pyrometer 30 and the vertical roll 10 before finishing rolling are installed at the entrance of the hot continuous rolling and finishing rolling system, and the exit of the hot continuous rolling and finishing rolling system There is a width measuring instrument 31 and an outlet pyrometer 32, the width measuring instrument 31 is connected with the tension adjustment module through ...

Images