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Variable pressure control method for coiling and pinch rolls of thick gauge carbon steel in continuous hot rolling

A thick gauge, pinch roller technology, applied in the direction of tension/pressure control, can solve the problems of scratches, bow on the steel plate, low tension, etc., and achieve the effect of improving the yield, improving the control accuracy and ensuring the quality of the roll.

Active Publication Date: 2017-08-15
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether the pressure standard of the coiling pinch roll is suitable determines the quality of the finished strip. If the pressure is too high, the strip will be rolled into stacking faults; if the pressure is too small, the pinch roll will not press the strip tightly, especially for thick specifications (thickness≥8mm). After the carbon steel is thrown out of the finish rolling stand, the tension of the strip is small, and the tail of the steel plate is not pulled tightly, causing the steel plate to bow up. During the coiling process, it rubs against the on-site mechanical guard plate, resulting in scratches on the upper surface, which seriously affects sales. and customer use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: When coiling carbon steel T610L, the second-level computer sends down the target thickness of 8.9mm, and the first-level computer checks the variable pressure coefficient of the pinch roll △K = 0.1 through the variable pressure coefficient value table, and the original pressure coefficient K in the program 1 =0.4, and K= K according to the variable pressure coefficient algorithm of the pinch roller 1 +△K=0.4+0.1=0.5, that is: when the head of the strip reaches the position of the pinch roller and the signal of "pressure increase of the pinch roller" is turned on, the original pressure reference coefficient in the program is 0.4 Coil the head of the strip And the body part; when the finish rolling end rack throws steel, when the "end rack load relay" signal is turned off, put in the changed pressure coefficient of 0.5 to coil the tail of the strip.

Embodiment 2

[0026] Example 2: When coiling carbon steel T610L, the second-level computer sends down the target thickness of 10mm, and the first-level computer checks the variable pressure coefficient of the pinch roll △K = 0.15 through the variable pressure coefficient value table, and the original pressure reference coefficient K in the program 1 =0.4, and K= K according to the variable pressure coefficient algorithm of the pinch roller 1 +△K=0.4+0.15=0.55, that is: when the strip head reaches the position of the pinch roll and the signal of "pinch roll pressure increase" is turned on, the original pressure coefficient in the program is 0.4 to coil the strip head and Body part; when the signal of the "last stand load relay" is turned off after the finish rolling end stand throws steel, put in the changed pressure coefficient of 0.55 to coil the tail of the strip.

Embodiment 3

[0027] Example 3: When coiling carbon steel T610L, the second-level computer sends down the target thickness of 11.8mm, and the first-level computer checks the variable pressure coefficient of the pinch roll △K=0.25 through the variable pressure coefficient value table, and the original pressure coefficient K in the program 1 =0.4, variable pressure coefficient of pinch roller K= K 1 +△K=0.4+0.25=0.65, that is: when the strip head reaches the position of the pinch roll and the signal of "pinch roll pressure increase" is turned on, the original pressure coefficient in the program is 0.4 to coil the strip head and Body part; when the finish rolling end stand throws steel, when the signal of "end stand load relay" is turned off, put in the changed pressure coefficient of 0.65 to coil the tail of strip steel.

[0028] In short, it is necessary to debug and determine the variable pressure coefficient of the pinch roller according to the actual situation of the coiled steel on site....

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PUM

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Abstract

The invention provides a hot continuous rolling thick-gauge carbon steel reeling pinch roll variable pressure control method which is suitable for carbon steel of which the thickness is larger than or equal to 8 mm. The control method is characterized in that an original pressure coefficient is input when the head and the body part of strip steel is reeled; after steel throwing is conducted through a precision rolling final rack, a variable pressure coefficient is input when the tail of the strip steel is reeled; the variable pressure coefficient K=K1+deltaK, wherein K is the variable pressure coefficient and is larger than zero and smaller than one, K1 is the original pressure coefficient (generally, the value is 0.4), and deltaK is an additional pressure coefficient of which the value is in the range of 0.0-0.3. According to the hot continuous rolling thick-gauge carbon steel reeling pinch roll variable pressure control method, the problem that the thick-gauge carbon steel is scratched due to upward bowing of the tail of the carbon steel is solved, automatic variable pressure control of a pinch roll is achieved, the product surface yield is increased on the premise that the good reeling shape is ensured, and considerable benefits are obtained.

Description

technical field [0001] The coiling and pinch rollers of the hot strip rolling line are automatically controlled, and the invention is suitable for carbon steel with a thickness ≥ 8mm. Background technique [0002] The function of the pinch roll in the coiling area of ​​hot continuous rolling is to clamp the strip steel that passes through the roller table in the coiling area after rolling in the finishing stand, and effectively wind it on the coil to form a neat finished steel coil. Whether the pressure standard of the coiling pinch roller is suitable determines the quality of the finished strip steel. If the pressure is too high, the strip steel will be rolled into stacking faults; After the carbon steel is thrown out of the finishing stand, the tension of the strip is small, and the tail of the steel plate is not pulled tightly, causing the steel plate to bow, and rubs against the on-site mechanical guard plate during the coiling process, resulting in scratches on the uppe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/48
CPCB21B37/48
Inventor 闫峥嵘张世厚康炜樊瑞亮白兴亮
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD