Production Method for Reducing the Occurrence of Non-weld Broken Strip in Cold Rolling Process

Abstract

The invention provides a production method for reducing non-weld joint strip breakage occurrence rate during a cold rolling process. The control in production is as followed: (1) controlling the convexity and the wedge shape of a hot rolling raw material plate; (2) controlling the width of hot rolling coil incoming materials; (3) setting a surface inspection system and a fault warning system after acid pickling; (4) increasing the length of cutting the head and tail of raw materials at an inlet; (5) controlling the tension fluctuation range of the operation side and the transmission side in cold rolling; (6) controlling the highest speed of an outlet of a rolling mill. According to the production method for reducing the non-weld joint strip breakage occurrence rate during the cold rolling process, the non-weld joint strip breakage occurrence rate can be easily reduced without affecting production and cold rolling performance.

Description

technical field

[0001] The invention belongs to the technical field of steel rolling, in particular to a production method for reducing the occurrence rate of non-weld strip breakage in the cold rolling process. Background technique

[0002] In continuous cold rolling production, strip breakage is a common accident, which directly leads to the shutdown of the production line, the decrease of operating rate, the decrease of product yield, and the degradation of product quality in pickling parts. After a serious belt breaking accident, it will cause the roll to stick to steel, burst the roll, and increase the consumption of the roll. The exploration of the cause of the broken belt is closely related to the smooth flow of production and the increase of enterprise efficiency. Broken strips include weld broken strips and non-welded seam broken strips. The reason for weld broken strips is mainly due to the quality of the weld and the rolling parameter settings in the welding area...

Examples

Embodiment 1

[0043]In the production process in January, nearly 1,000 hot-rolled incoming coils with a thickness of 2.3-2.5mm were rolled. 10μm; the width of the hot-rolled incoming coil is controlled to be 15mm wider than the width of the raw material; when the hot-rolled coil is cut at the head and tail of the raw material at the entrance, the cutting length of the head and tail is cut to 10 meters; the transmission of the cold rolling process is guaranteed The tension fluctuation between the operating side and the operating side is in the range of 0-5KN; after pickling, no obvious defects on the surface of the strip steel were observed through the surface inspection system, and the defect alarm system did not issue an alarm, indicating that there is no 50mm knot at the edge of the thin material. Defects such as scars, comets, folds, etc.; control the maximum exit speed of the rolling mill to about 700m / min.

Embodiment 2

[0045] In the production process in February, nearly 1,000 hot-rolled incoming coils with a thickness of 2.3-2.5mm were rolled. 10μm; the width of the hot-rolled incoming coil is controlled to be 17mm wider than the width of the required material; when the hot-rolled coil is cut at the head and tail of the raw material at the entrance, the cutting length of the head and tail is cut to 10 meters; the transmission of the cold rolling process is guaranteed The tension fluctuation between the operating side and the operating side is in the range of 5-10KN; after pickling, no obvious defects on the surface of the strip steel were observed through the surface inspection system, and the defect alarm system did not issue an alarm, indicating that there is no 50mm knot at the edge of the thin material. Scars, comets, folds and other defects; control the maximum exit speed of the rolling mill at about 600m / min.

Embodiment 3

[0047] In the production process in March, nearly 1,000 hot-rolled incoming coils with a thickness of 2.3-2.5mm were rolled. 20μm; the width of the hot-rolled incoming coil is controlled to be 18mm wider than the width of the raw material; when the hot-rolled coil is cut at the head and tail of the raw material at the entrance, the cutting length of the head and tail is cut to 8 meters; the transmission of the cold rolling process is guaranteed The tension fluctuation between the operating side and the operating side is in the range of 0-7KN; after pickling, no obvious defects on the surface of the strip steel were observed through the surface inspection system, and the defect alarm system did not issue an alarm, indicating that there is no 50mm knot at the edge of the thin material. Scars, comets, folds and other defects; control the maximum exit speed of the rolling mill at about 650m / min.

technical field

[0001] The invention belongs to the technical field of steel rolling, in particular to a production method for reducing the occurrence rate of non-weld strip breakage in the cold rolling process. Background technique

[0002] In continuous cold rolling production, strip breakage is a common accident, which directly leads to the shutdown of the production line, the decrease of operating rate, the decrease of product yield, and the degradation of product quality in pickling parts. After a serious belt breaking accident, it will cause the roll to stick to steel, burst the roll, and increase the consumption of the roll. The exploration of the cause of the broken belt is closely related to the smooth flow of production and the increase of enterprise efficiency. Broken strips include weld broken strips and non-welded seam broken strips. The reason for weld broken strips is mainly due to the quality of the weld and the rolling parameter settings in the welding area...

Examples

Embodiment 1

[0043]In the production process in January, nearly 1,000 hot-rolled incoming coils with a thickness of 2.3-2.5mm were rolled. 10μm; the width of the hot-rolled incoming coil is controlled to be 15mm wider than the width of the raw material; when the hot-rolled coil is cut at the head and tail of the raw material at the entrance, the cutting length of the head and tail is cut to 10 meters; the transmission of the cold rolling process is guaranteed The tension fluctuation between the operating side and the operating side is in the range of 0-5KN; after pickling, no obvious defects on the surface of the strip steel were observed through the surface inspection system, and the defect alarm system did not issue an alarm, indicating that there is no 50mm knot at the edge of the thin material. Defects such as scars, comets, folds, etc.; control the maximum exit speed of the rolling mill to about 700m / min.

Embodiment 2

[0045] In the production process in February, nearly 1,000 hot-rolled incoming coils with a thickness of 2.3-2.5mm were rolled. 10μm; the width of the hot-rolled incoming coil is controlled to be 17mm wider than the width of the required material; when the hot-rolled coil is cut at the head and tail of the raw material at the entrance, the cutting length of the head and tail is cut to 10 meters; the transmission of the cold rolling process is guaranteed The tension fluctuation between the operating side and the operating side is in the range of 5-10KN; after pickling, no obvious defects on the surface of the strip steel were observed through the surface inspection system, and the defect alarm system did not issue an alarm, indicating that there is no 50mm knot at the edge of the thin material. Scars, comets, folds and other defects; control the maximum exit speed of the rolling mill at about 600m / min.

Embodiment 3

[0047] In the production process in March, nearly 1,000 hot-rolled incoming coils with a thickness of 2.3-2.5mm were rolled. 20μm; the width of the hot-rolled incoming coil is controlled to be 18mm wider than the width of the raw material; when the hot-rolled coil is cut at the head and tail of the raw material at the entrance, the cutting length of the head and tail is cut to 8 meters; the transmission of the cold rolling process is guaranteed The tension fluctuation between the operating side and the operating side is in the range of 0-7KN; after pickling, no obvious defects on the surface of the strip steel were observed through the surface inspection system, and the defect alarm system did not issue an alarm, indicating that there is no 50mm knot at the edge of the thin material. Scars, comets, folds and other defects; control the maximum exit speed of the rolling mill at about 650m / min.

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