Control method for high-strength steel straightening and leveling unit

A unit control, high-strength steel technology, applied in elongation control, metal rolling, manufacturing tools, etc., can solve the problems of uneven heating and high residual stress level of high-strength steel products, and achieve the effect of ensuring performance and quality

Active Publication Date: 2012-08-08
WISDRI ENG & RES INC LTD
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Problems solved by technology

However, for high-strength steel products, the residual stress level inside the high-strength steel products is much higher than that of ordinary hot-rolled products due to deformation and uneven heating during the previous hot-rolling process.
Therefore, the residual stress inside the high-strength steel product remains at a relatively high level after being processed by the hot-rolled tempering unit, causing many quality problems in subsequent processing

Method used

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  • Control method for high-strength steel straightening and leveling unit
  • Control method for high-strength steel straightening and leveling unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] High-strength steel straightening and leveling unit control method, using such as figure 1 The straightening and leveling unit shown is for high-strength steel treatment, which is characterized in that the total elongation of the high-strength steel in the process section is controlled for the straightening and leveling unit, and the reciprocating bending action of the leveler is used to fully reduce the residual stress level of the hot-rolled high-strength steel. The real-time dynamic adjustment capability of the temper mill can effectively control the yield strength of hot-rolled high-strength steel; the specific steps are as follows:

[0027] Firstly, the total elongation of the unit is set according to the required yield strength of the strip product at the end of the process section; then, the set value of the total elongation is assigned to the straightening machine and the tempering machine to pre-set the straightening and leveling process; after that, Real-time...

Embodiment 2

[0030] Embodiment 2: On the basis of the above-mentioned embodiment 1, 80% of the total elongation setting value is distributed to the straightener 3, and the pressing depth of the upper roller of the straightener is set in a preset manner; the total elongation 20% of the rate setting value is assigned to the tempering machine 4 to pre-set the rolling force; Feedback the deviation signal to the rolling force control system of the temper mill 4, and ensure the stability of the total elongation of the process section through the adjustment of the rolling force of the temper mill 4, so as to fully reduce the residual stress level of the strip and at the same time ensure that the product performance quality.

Embodiment 3

[0031] Embodiment 3: On the basis of the above-mentioned embodiment 1, 70%~90% of the total elongation is allocated to the straightener 3, and the pressing depth of the upper roller of the straightener is set in a preset manner; the total elongation The remaining proportion of the ratio is assigned to the tempering machine 4 to pre-set the rolling force; when there is a deviation between the total elongation of the strip processed in the straightening and leveling process section and the total elongation set value, the deviation signal Feedback to the rolling force control system of the temper mill 4 to ensure the stability of the total elongation of the process section through the adjustment of the rolling force of the temper mill 4, thereby fully reducing the residual stress level of the strip and at the same time ensuring the performance and quality of the product .

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Abstract

The invention relates to a control method for a high-strength steel straightening and leveling unit. The unit mainly comprises a straightening machine and a leveling machine. The method is characterized by comprising the following steps of: dynamically controlling the total elongation rate of high-strength steel at a process section of the straightening and leveling unit; fully lowering the residual stress level of hot-rolled high-strength steel under the reciprocating bending action of the straightening machine; and effectively controlling the yield strength of the hot-rolled high-strength steel by using the real-time dynamic adjusting capability of the leveling machine, and lowering the residual stress level of the high-strength steel by using the straightening machine. According to the method, the performance quality of a high-strength steel product on the tail of the process section is ensured.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled high-strength steel leveling, in particular to a unit control method in the production process of hot-rolled high-strength steel leveling and leveling, which can be applied to various types of high-strength steel hot-rolling leveling units. [0002] Background technique [0003] Traditionally, hot-rolled skin pass units are generally used for deep processing of hot-rolled products, so as to effectively improve the flatness accuracy, thickness accuracy and surface quality of hot-rolled products. However, for high-strength steel products, due to deformation and uneven heating during the previous hot-rolling process, the residual stress level inside the high-strength steel products is much higher than that of ordinary hot-rolled products. Therefore, the residual stress inside the high-strength steel product remains at a relatively high level after being processed by the hot-rolled tempering unit,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/56B21B15/00
Inventor 丁文红安甲乙
Owner WISDRI ENG & RES INC LTD
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