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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, high residual stress level of high-strength steel products, etc., to achieve the effect of ensuring performance quality

Active Publication Date: 2012-08-08
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
  • Elongation rate distribution method for high-strength steel straightening and leveling unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[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 product at the end of the process section; subsequently, the set value of the total elongation is distributed in proportion to the straightening machine and the tempering machine for straightening The leveling process is pre-set, and the pressing depth of the upper roll of the leveler is set in a pre-set manner, and the rolling force is pre-set through the rolling force control system; after that, the processing is detected in real time by using the unit inlet and outlet speed measuring devices 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 temper mill in real time to ensure that the high-strength steel product at the end of the process section The total elongation, while using the leveler to reduce the residual...

Embodiment 2

[0027] Set the total elongation setting value of the unit according to the allowable yield strength of the final product in the process section, and use the speed measuring encoder on the turning pinch roll 2 at the entrance of the unit and the speed measuring encoder on the turning pinch roll 5 at the exit to measure the total elongation of the strip after processing. The elongation rate is detected and controlled. The specific control method is as follows: the total elongation setting value is distributed to the straightener 3 in proportion, and the pressing depth of the upper roller of the straightening machine is set in a preset manner; the remaining ratio of the total elongation setting value is distributed to The tempering machine 4 pre-sets 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 set value of the total elongation, the deviation signal is fed back to the temp...

Embodiment 3

[0030] Embodiment 5: On the basis of the above-mentioned embodiment 1 or 2, distribute 80% to 85%, such as 81%, 83% or 84%, of the total elongation to the straightening machine 3, and set it in a preset manner The pressing depth of the upper roll of the straightening machine; the remaining proportion of the total elongation is distributed to the tempering machine 4 to pre-set the rolling force; When there is a deviation between the fixed values, the deviation signal is fed back to the rolling force control system of the temper mill 4, and the rolling force adjustment of the temper mill 4 is used to ensure the stability of the total elongation of the process section, and then fully reduce the While maintaining the residual stress level of the steel, the performance quality of the product is guaranteed.

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Abstract

The invention relates to an elongation rate distribution method for a high-strength steel straightening and leveling unit. The method is characterized by comprising the following steps of: controlling the total elongation rate of high-strength steel at a process section of the straightening and leveling unit according to the product deformation characteristic in a hot-rolling processing process and the processing characteristics and control stability of the straightening machine and the leveling machine; proportionally distributing a total elongation rate set value to the straightening machine and the leveling machine for presetting straightening and leveling processes; 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 final performance of the high-strength steel by using the real-time dynamic adjusting capability of the leveling machine. According to the method, the internal residual stress level of band steel after hot rolling can be lowered fully, the yield strength of the hot-rolled high-strength steel is controlled effectively, and the performance quality of a product is ensured.

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. [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 u...

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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