Method for measuring flat elongation of strip steel
A technology of flat elongation and measurement method, which is applied in the measurement field of flat elongation of strip steel, can solve problems such as the inability to obtain strip elongation and the inability to eliminate the influence of calculation accuracy of strip elongation, and achieve the effect of high precision
Active Publication Date: 2020-09-15
SHOUGANG CORPORATION
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Problems solved by technology
[0004] The invention provides a method for measuring the flat elongation of strip steel, which solves or partially solves the problem of using the speed difference before and after strip steel flattening to obtain flat elongation in the prior art. On the one hand, the elasticity of strip steel under tension cannot be eliminated. The influence of deformation on the elongation calculation accuracy, on the other hand, the technical problem that the elongation at different width positions of the strip cannot be obtained
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[0019] see figure 1 , a kind of measuring method of flat elongation of strip steel that the embodiment of the present invention provides comprises the following steps:
[0020] Carve two thin lines perpendicular to the length direction of the strip as positioning marks on the surface of the strip before leveling.
[0021] Measure the distance D between the two thin lines.
[0022] The steel strip with the thin line of the positioning mark is leveled, and the tension of the strip steel is removed after leveling, and the distance d between the two thin lines is measured again.
[0023] The actual elongation of the strip when it is flat is (d-D) / D.
[0024] Specific Embodiments of the Application Because the strip steel surface before leveling is engraved with two thin lines perpendicular to the length direction of the strip steel as positioning marks, and the distance D between the two thin lines is measured, there will be strip steel with positioning mark thin lines Perform ...
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Abstract
The invention discloses a method for measuring a flat elongation of strip steel, and belongs to the technical field of steel rolling. The method for measuring the flat elongation of the strip steel comprises the following steps of carving two fine lines perpendicular to the length of the strip steel as positioning marks on the surface of the strip steel before flattening; measuring the distance Dbetween the two fine lines; flattening the strip steel with the positioning mark fine lines, removing the strip tension after flattening, and measuring the distance d between the two fine lines again;and the actual elongation of the strip steel when being flattened is (d-D) / D. The method for measuring the flat elongation of the strip steel provided by the invention can not only measure the elongation of the strip steel under different flattening force conditions, but can also measure the elongation of different width positions under the same flattening force; and besides, the accuracy is high, and the measurement error can be controlled within + / - 0.02%.
Description
technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for measuring flat elongation of strip steel. Background technique [0002] Hot-rolled strip steel, especially thin-gauge high-strength steel, usually adopts a tempering process to eliminate strip steel wavy and ensure product quality. In strip leveling, elongation is a key process parameter that affects the quality of the strip. The so-called leveling elongation, that is, the ratio of the length difference before and after the leveling of the strip to the original length of the strip, is usually calculated by using the speed difference before and after the leveling of the strip. [0003] However, using the speed difference before and after strip steel leveling to obtain the leveling elongation, on the one hand, it is impossible to eliminate the influence of the elastic deformation of the strip under tension on the elongation calculation accuracy; on the other han...
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IPC IPC(8): B21C51/00
CPCB21C51/00
Inventor 李旭东王淑志孙力娟李振山张兴光董立杰王秋娜罗旭烨王伦
Owner SHOUGANG CORPORATION