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Hot-rolled coiler pinch roll controlling method

A control method and technology of pinch rollers, applied in the field of control of pinch rollers

Active Publication Date: 2012-07-18
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] The technical problem to be solved by the present invention is to provide a method for controlling the pressure of the pinch rolls of a hot rolling coiler, which can avoid poor coil shape quality, There are many defects on the surface of the steel plate and the wear of the pinch roller is large, so as to save production costs and improve production quality

Method used

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  • Hot-rolled coiler pinch roll controlling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Taking the strip steel of steel type SPHC, thickness 3.75mm, width 1500mm, and thermal yield strength 180 as an example, this technology mainly operates according to the following steps:

[0101] The first step: position control stage before biting steel

[0102] Use formula 1 to calculate the position (roll gap) setting value of the pinch roll before biting the steel.

[0103] GAP PR 1 = h-h*10% (1)

[0104] =3.75-3.75*10%

[0105] =3.45[mm]

[0106] in

[0107] GAP PR 1 Set roll gap for pinch rolls before biting [mm]

[0108] h is strip thickness [mm]

[0109] When h*10%≥0.3, take 0.3

[0110] The second step: high pressure control stage when biting steel

[0111] 2.1 Calculation of unit tension

[0112] UT=9.81*(2 / h+0.1)*HYP / 206*1.2 (3)

[0113] =9.81*(2 / 3.75+0.1)180 / 206*1.2

[0114] =6.51[N / mm 2 ]

[0115] in

[0116] UT unit tension [N / mm 2 ]

[0117] h is strip thickness = 3.75mm

[0118] HYP thermal yield strength=180, when 9.81*(2 / h+0.1)HYP / 206...

Embodiment 2

[0155] Taking strip steel of steel type BS700MC, thickness 3.75mm, width 1500mm, and thermal yield strength 310 as an example, this technology mainly operates according to the following steps:

[0156] The first step: position control stage before biting steel

[0157] Use formula 1 to calculate the position (roll gap) setting value of the pinch roll before biting the steel.

[0158] GAP PR 1 = h-h*10% (1)

[0159] =3.75-3.75*10%

[0160] =3.45[mm]

[0161] in

[0162] GAP PR 1 Set roll gap for pinch rolls before biting [mm]

[0163] h is strip thickness [mm]

[0164] When h*10%≥0.3, take 0.3

[0165] The second step: high pressure control stage when biting steel

[0166] 2.1 Calculation of unit tension

[0167] UT=9.81*(2 / h+0.1)*HYP / 206*1.2 (3)

[0168] =9.81*(2 / 3.75+0.1)310 / 206*1.2

[0169] =11.22[N / mm 2 ]

[0170] in

[0171] UT unit tension [N / mm 2 ]

[0172] h is strip thickness = 3.75mm

[0173] HYP thermal yield strength=180, when 9.81*(2 / h+0.1)HYP / 206...

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Abstract

The invention relates to a hot-rolled coiler pinch roll controlling method. A pinch roll adopts position control or pressure control. The hot-rolled coiler pinch roll controlling method comprises the following steps that: step 1: before strip steel is gripped, the pinch roll adopts the position control; step 2: at the moment when a head part of the strip steel is gripped, the pinch roll adopts the pressure control; step 3: after the strip steel is wound on a wound roll and tension is formed, the pinch roll adopts the position control or the pressure control; and step 4: after the strip steel is tailed-out by a finishing front stander, the pinch roll adopts the pressure control. Due to adoption of the method, on the premise of the present precision control of roll-gap deviation at two sides of the pinch roll, the coiling quality of the tail part of a thin sheet can be improved, coiling flaws such as creasing, edge damage and surplus edge on the tail part of a steel coil can be reduced, damage on the surface of the pinch roll caused by the rolling cracking of the tail part of the strip steel can also be effectively reduced, the indentation flaw of the pinch roll can be reduced, and the high-strength steel wave-shaped flaw caused by the abrasion of the pinch roll can be improved.

Description

technical field [0001] The invention relates to a control method, in particular to a control method of a pinch roll, especially a control method of a pinch roll applied to a coiler for hot rolling. Background technique [0002] Coilers are used in many industries. Coilers are mechanical devices that roll products into rolls. In terms of complexity, coilers for steel plates in the metallurgical industry are typical. Coiler drive is from electricity, fluid, etc. The coiler generally consists of the core equipment reel (reel), auxiliary coiling equipment (auxiliary forming equipment) and so on. In the product coiling process, the product is mainly formed on the reel, and the reel is generally driven by a motor, and the auxiliary coiling equipment is generally driven by fluid to help roll smoothly. [0003] Coilers are mainly used for coiling long rolled products into coils or coils. In a modern cold-rolled strip workshop, the coiler is also widely used in shearing, pickling...

Claims

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Application Information

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IPC IPC(8): B21C47/24
Inventor 幸利军黄宁海张仁其
Owner BAOSHAN IRON & STEEL CO LTD
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