Method for determining the number of rolls of a high-strength steel strip tension leveler

Abstract

The application discloses a method for determining the number of rollers of a high-strength steel strip tension leveler, and comprises the following steps: determining the mechanical property information of a to-be-corrected strip and the size information of the to-be-corrected strip; selecting a proper average tension of the strip according to the mechanical property information of the to-be-corrected strip and the size information of the to-be-corrected strip, so as to calculate the number n of rollers of the tension leveler. The method for determining the number of rollers of the high-strength steel strip tension leveler is very reasonable in determining the number of bending rollers of the high-strength steel tension leveler, and meanwhile, the elongation of the surface of the straightened strip is ensured, so that the surface crack or break of the strip is not easily caused in the tension leveling process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of straightening machine design, and particularly relates to a method for determining the number of rollers of a high-strength steel strip tension leveler. BACKGROUND

[0002] In the present metallurgical industry, the purpose of straightening is to improve the bending radius of the raw material, and to achieve the target bending radius of straightening. In most cases, the straightening is to achieve flattening, that is, the bending radius after straightening is infinite. With the development of material technology and the increasing requirements for the inherent properties of materials, the yield strength of the material is also increasing, and the strain of the tensile limit is also closer to the strain of the elastic limit condition, that is, the elongation of the surface of the strip cannot be too large, otherwise the surface of the strip is prone to cracks or breakage during the tension straightening process. b

[0003] For high-strength steel strips, the thickness is not large, and the plate shape quality is poor. In order to improve the plate shape, the elongation needs to be realized through the tension leveler. For the steel with low yield strength in the past, in order to realize the elongation, 2 or 4 times bending is generally adopted, and there is no special requirement for the bending of the strip. With the development of the steel industry, high-strength steel, especially high-strength steel after quenching, has large yield strength and small reverse bending capacity, and it is difficult to produce elongation.

[0004] However, there is no method for reasonably determining the number of rollers of the high-strength steel strip tension leveler in the prior art. SUMMARY

[0005] The main purpose of the present application is to provide a method for determining the number of rollers of a high-strength steel strip tension leveler, which aims to reasonably determine the number of rollers of the tension leveler while ensuring that the elongation of the surface of the strip cannot be too large.

[0006] To achieve the above purpose, the present application provides a method for determining the number of rollers of a high-strength steel strip tension leveler, comprising the following steps:

[0007] determining the mechanical property information of the strip to be straightened and the size information of the strip to be straightened;

[0008] According to the mechanical property information of the strip to be straightened and the size information of the strip to be straightened, a suitable average tension of the strip is selected to calculate the number of rollers n of the tension leveler.

[0009] Preferably, the size information of the strip to be straightened includes the width B and the thickness H of the strip.

[0010] Preferably, the mechanical property information of the strip to be straightened includes the strain ε of the strip under the elastic limit condition, the strain ε of the strip under the tensile strength limit condition, and the elastic modulus E and the target elongation ε of the strip. s b p ​​​​

[0011] Preferably, the average tension F of the strip steel is between 0.1BHσ s and 0.3BHσ s .

[0012] Preferably, the number n of the rollers of the tension leveler is calculated by the following formula:

[0013]

[0014] Preferably, the number n of the rollers is the minimum integer value under the premise of satisfying the formula.

[0015] The method for determining the number of rollers of the tension leveler for high-strength steel strip provided by the present application reasonably determines the number of bending rollers of the tension leveler for high-strength steel, and ensures the elongation of the surface of the high-strength steel strip after straightening, so that the surface cracks or breakage of the strip steel is not easily caused in the tension leveling process. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a flowchart of the method for determining the number of rollers of the tension leveler for high-strength steel strip.

[0017] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0018] It should be understood that the specific embodiments described herein are merely intended to explain the present application, and are not intended to limit the present application.

[0019] In the preferred embodiment, a method for determining the number of rollers of the tension leveler for high-strength steel strip includes the following steps:

[0020] Step S1, determining the mechanical property information of the strip steel to be straightened and the size information of the strip steel to be straightened;

[0021] Step S2, selecting a suitable average tension of the strip steel according to the mechanical property information of the strip steel to be straightened and the size information of the strip steel to be straightened, to calculate the number n of the rollers of the tension leveler.

[0022] Specifically, in step S1, the size information of the strip steel to be straightened includes the strip steel width B and the strip steel thickness H.

[0023] The mechanical property information of the strip steel to be straightened includes the strain ε s of the strip steel under the elastic limit condition, the strain ε b of the strip steel under the tensile strength limit condition, the elastic modulus E of the strip steel and the target elongation ε p .

[0024] Specifically, the average tension F of the strip steel is between 0.1BHσ s and 0.3BHσ sThe greater the F value, the greater the tension equipment capacity required, the higher the cost of the equipment providing tension, and the higher the operating cost. The smaller the tension, the more the number of the stretch leveler rollers required, the more difficult the stretch leveler equipment manufacturing, and the higher the cost. Therefore, the selection of F and n needs to comprehensively consider the equipment manufacturing cost and operating cost.

[0025] In the embodiment, the number of rollers n of the stretch leveler is calculated by using the following formula:

[0026]

[0027] The number of rollers n is the minimum integer value under the premise of meeting the formula. In the above formula, σ s is the yield strength, ε s is the strain under the elastic limit condition, ε b is the strain under the tensile strength limit condition, i.e., the strain when the strip steel is not deformed when stretched (compressed), the elastic modulus E of the strip steel, the width B of the strip steel, the thickness H of the strip steel, the target elongation ε p , and all the above parameters are known values. Therefore, only the average tension F of the strip steel needs to be determined to determine the number of rollers n.

[0028] The greater the ε b , the smaller the number of rollers n. Therefore, the special property of the high-strength steel is the main reason for limiting that the number of rollers n cannot be too small

[0029] The greater the ε p , the greater the number of rollers n, i.e., the worse the plate shape, and the greater the ε p is required, i.e., the more the number of rollers required.

[0030] The method for determining the number of rollers of the high-strength steel strip stretch leveler provided by the present application reasonably determines the number of bending rollers of the high-strength steel stretch leveler, and at the same time, ensures the elongation of the surface of the high-strength steel strip after straightening. Therefore, the surface cracks or ruptures of the strip steel are not easily caused in the stretch leveling process.

[0031] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A method for determining the number of rollers in a high-strength steel strip tension leveling machine, characterized in that, Includes the following steps: Determine the mechanical properties and dimensional information of the strip to be straightened; Based on the mechanical properties and dimensions of the strip to be straightened, a suitable average strip tension is selected to calculate the number of rolls required for the tension leveler. The dimensional information of the strip to be straightened includes the strip width. and strip thickness ; The mechanical property information of the strip to be straightened includes the strain of the strip under the elastic limit condition. strain under the ultimate tensile strength condition and the elastic modulus of strip steel and target extension rate Average tension of strip steel exist to Between; the number of rollers of the tension leveler Calculate using the following formula: 。 2. The method for determining the number of rollers in a high-strength steel strip tension leveler as described in claim 1, characterized in that, Roller count Take the smallest integer value while satisfying the formula.

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