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Elongation rate distribution method for high-strength steel straightening and leveling unit

A distribution method, high-strength steel technology, applied in the direction of 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 goal of reducing residual stress level and ensuring performance quality Effect

Active Publication Date: 2014-08-13
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Elongation rate distribution method for high-strength steel straightening and leveling unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The elongation distribution method of a high-strength steel straightening and leveling unit. The unit mainly includes a straightening machine and a leveler, which is characterized by: according to the product deformation characteristics during the hot rolling process, the processing characteristics of the leveler and the leveler, and the control Stability, control the total elongation of the high-strength steel in the process section of the leveling and leveling unit, and distribute the total elongation setting value to the leveling machine and leveling machine in proportion to preset the leveling and leveling process, using the reciprocation of the leveling machine The bending effect fully reduces the residual stress level of hot-rolled high-strength steel, and the real-time dynamic adjustment capability of the leveler is used to effectively control the final performance of the high-strength steel.

Embodiment 2

[0025] On the basis of Example 1, the total elongation of the unit is set according to the required yield strength of the high-strength steel products at the end of the process section; then, the total elongation setting value is proportionally distributed to the leveler and the leveling machine for straightening The leveling process is preset, the pressing depth of the upper roll of the straightening machine is set by the preset method, and the rolling force is preset through the rolling force control system; after that, the unit inlet and outlet speed measuring devices are used to detect the processing in real time After the total elongation of the high-strength steel; finally, compare the detected total elongation of the processed high-strength steel with the set value of the total elongation, and dynamically adjust the rolling force of the leveler in real time to ensure the final high-strength steel product The total elongation is used to reduce the residual stress level of ...

Embodiment 3

[0028] Embodiment 3: On the basis of the above embodiment 1 or 2, 80% of the set value 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; 20% of the set value of the total elongation is allocated to the leveler 4 for pre-setting the rolling force; when there is a deviation between the total elongation and the set value of the total elongation after the strip steel in the straightening and flattening process section , The deviation signal is fed back to the rolling force control system of the leveler 4, and the rolling force of the leveler 4 is adjusted to ensure the stability of the total elongation of the process section, thereby fully reducing the residual stress level of the strip. Ensure product performance and quality.

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Abstract

The invention relates to a method for allocating the elongation rate of a high-strength steel straightening and leveling unit. The total elongation of high-strength steel is controlled, and the set value of the total elongation is distributed to the leveler and the tempering machine in proportion to pre-set the straightening and leveling process, and the reciprocating bending effect of the leveler is used to fully reduce the residual of hot-rolled high-strength steel Stress level, using the real-time dynamic adjustment capability of the temper machine to effectively control the final performance of high-strength steel. It can fully reduce the residual stress level inside the hot-rolled steel strip, effectively control the yield strength of the hot-rolled high-strength steel, and ensure the performance and quality of the product.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled high-strength steel leveling, and in particular relates to an elongation control and distribution method of a hot-rolled high-strength steel leveling unit, which can be applied to various types of high-strength steel hot-rolling leveling units. Background technique [0002] 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, causi...

Claims

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Application Information

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