CN111659754B - Method for measuring flat elongation of strip steel - Google Patents
Method for measuring flat elongation of strip steel Download PDFInfo
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- CN111659754B CN111659754B CN202010392271.1A CN202010392271A CN111659754B CN 111659754 B CN111659754 B CN 111659754B CN 202010392271 A CN202010392271 A CN 202010392271A CN 111659754 B CN111659754 B CN 111659754B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
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Abstract
The invention discloses a method for measuring the 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: carving two thin lines which are vertical to the length direction of the strip steel and serve as positioning marks on the surface of the strip steel before leveling; measuring the distance D between the two thin lines; leveling the strip steel with the positioning marking thin lines, removing the tension of the strip steel after leveling, and measuring the distance d between the two thin lines again; the actual elongation rate of the flat strip steel is (D-D)/D. The method for measuring the leveling elongation of the strip steel can measure the elongation of the strip steel under different leveling force conditions, can also measure the elongation of different width positions under the same leveling force, has high precision, and can control the measurement error within +/-0.02 percent.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for measuring the flat elongation of strip steel.
Background
Hot rolling strip steel, especially thin gauge high strength steel, usually employs a flattening process to eliminate strip steel wave shape and ensure product quality. In the strip steel leveling link, the elongation is a key process parameter influencing the strip shape quality. The so-called temper rolling elongation, which is the ratio of the difference in length of the strip before and after temper rolling to the original length of the strip, is usually calculated by using the difference in speed of the strip before and after temper rolling.
However, the leveling elongation is obtained by using the speed difference before and after leveling of the strip steel, so that on one hand, the influence of the elastic deformation of the strip steel under the action of tension on the calculation accuracy of the elongation cannot be eliminated, and on the other hand, the elongation at different width positions of the strip steel cannot be obtained.
Disclosure of Invention
The invention provides a method for measuring the flat elongation of strip steel, which solves or partially solves the technical problems that in the prior art, the flat elongation is obtained by utilizing the speed difference before and after the strip steel is flat, on one hand, the influence of the elastic deformation of the strip steel under the action of tension on the calculation precision of the elongation cannot be eliminated, and on the other hand, the elongation at different width positions of the strip steel cannot be obtained.
In order to solve the technical problem, the invention provides a method for measuring the flat elongation of strip steel, which comprises the following steps: carving two thin lines which are vertical to the length direction of the strip steel and serve as positioning marks on the surface of the strip steel before leveling; measuring the distance D between the two thin lines; leveling the strip steel with the positioning marking thin lines, removing the tension of the strip steel after leveling, and measuring the distance d between the two thin lines again; the actual elongation rate of the flat strip steel is (D-D)/D.
Further, the strip steel before being leveled is strip steel which is not leveled and tension is not established between the uncoiler and the coiler under the condition that the coiler can bite the strip steel tightly.
Furthermore, the method for engraving two thin lines perpendicular to the length direction of the strip steel as positioning marks on the surface of the strip steel comprises the following steps: placing a distance rod on the surface of the strip steel; and a scriber marks fine lines on the surface of the strip steel according to the marks of the ranging ruler.
Furthermore, two notches are formed in the distance ruler; and the scriber scribes the strip steel in the notch.
Furthermore, the two notches are perpendicular to the measuring surface of the distance rod.
Furthermore, the width of the notches is 0.3-1mm, the depth of the notches is 5-10mm, and the distance between the notches is 0.3-1.0 m.
Further, the scriber is a hard alloy scriber.
Further, the hardness of the scriber is greater than that of the strip steel.
Further, the diameter of the needle head of the scriber is 0.1-0.3 mm.
Further, the width of the thin line is less than 0.2 mm.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the method comprises the steps of carving two thin lines which are perpendicular to the length direction of the strip steel and serve as positioning marks on the surface of the strip steel before leveling, measuring the distance D between the two thin lines, leveling the strip steel with the thin lines with the positioning marks, removing the tension of the strip steel after leveling, and measuring the distance D between the two thin lines again, wherein the actual elongation rate of the strip steel during leveling is (D-D)/D, the lengths of the strip steel before and after leveling can be accurately obtained, the elongation rates of the strip steel under different leveling force conditions can be measured, the elongation rates of different width positions under the same leveling force can be measured, the precision is high, and the measurement error can be controlled within +/-0.02%.
Drawings
FIG. 1 is a schematic flow chart of a method for measuring the flat elongation of strip steel according to an embodiment of the present invention;
fig. 2 is a measurement result of the measurement method of the flat elongation of the strip steel in fig. 1.
Detailed Description
Referring to fig. 1, the method for measuring the flat elongation of the strip steel provided by the embodiment of the invention comprises the following steps:
two thin lines which are vertical to the length direction of the strip steel and are used as positioning marks are carved on the surface of the strip steel before being leveled.
The spacing D between the two thin lines was measured.
And flattening the strip steel with the positioning mark fine lines, removing the tension of the strip steel after flattening, and measuring the distance d between the two fine lines again.
The actual elongation rate of the flat strip steel is (D-D)/D.
According to the specific embodiment of the application, two fine lines perpendicular to the length direction of the strip steel and used as positioning marks are carved on the surface of the strip steel before leveling, the distance D between the two fine lines is measured, the strip steel with the positioning marks on the fine lines is leveled, the tension of the strip steel is removed after leveling, the distance D between the two fine lines is measured again, the actual elongation rate of the strip steel during leveling is (D-D)/D, the lengths of the strip steel before and after leveling can be accurately obtained, the elongation rates of the strip steel under different leveling force conditions can be measured, the elongation rates of different width positions under the same leveling force can also be measured, the precision is high, and the measurement error can be controlled within +/-0.02%.
Specifically, the strip steel before being flattened is strip steel which is not flattened and tension is not established between the uncoiler and the coiler under the condition that the coiler can bite the strip steel.
Specifically, the method for engraving two thin lines which are perpendicular to the length direction of the strip steel and serve as positioning marks on the surface of the strip steel comprises the following steps:
and placing the distance rod on the surface of the strip steel.
And (4) carving fine lines on the surface of the strip steel by the scriber according to the mark of the ranging rod.
Two notches are arranged on the distance ruler; the scriber carves fine lines on the strip steel in the gaps, and the distance ruler is used for measuring two rectangular gaps of the surface processing, so that the length of the strip steel before leveling can be accurately marked, and errors caused by human factors are eliminated.
The two gaps are perpendicular to the measuring surface of the distance ruler, so that the distance D between the two thin lines can be conveniently obtained.
Specifically, the width of the notch is 0.3-1mm, the depth of the notch is 5-10mm, and the distance between the notches is 0.3-1.0m, so that the needle head of the scratch needle can move conveniently.
Specifically, the scriber is a hard alloy scriber, the hardness of the scriber is greater than that of the strip steel, and fine lines can be conveniently scribed on the surface of the strip steel.
The diameter of the needle head of the scriber is 0.1-0.3mm, so that the scribed thin line meets the requirement.
Specifically, the width of the thin line is less than 0.2mm, so that the distance mark is clear after leveling, and the measuring precision is not influenced by too wide mark caused by the extension of the strip steel.
In order to more clearly describe the embodiments of the present invention, the following description is made in terms of the method of using the embodiments of the present invention.
Method 1
The width of a rectangular gap of the distance ruler is 0.5mm, the depth of the gap is 8mm, the gap distance is 0.5m, and the diameter of a needle head of the hard alloy scriber is 0.2 mm. Selecting strip steel with the thickness of 3mm and the width of 1200mm as a measuring object.
The strip is threaded by the temper mill, the strip steel is gripped by the coiling machine, and the tension of the strip steel is removed after the tension required by the process can be provided.
And (3) measuring the elongation of the strip steel when the leveling force is 160 tons:
the method comprises the following steps: selecting the strip steel which is uncoiled and does not enter the temper mill, enabling the strip steel to be parallel to the length direction of the strip steel, placing the distance ruler in the middle position of the width direction of the strip steel, and respectively engraving fine lines in two rectangular notches of the distance ruler by using a hard alloy scriber, wherein the line width is less than 0.2 mm.
Step two: and marking the two carved thin lines by using a gel pen ring.
Step three: the distance between two thin lines was measured and defined as D.
Step four: the leveling force of the leveling machine is set to 160 tons, and the strip steel is leveled.
Step five: and (4) stopping flattening after the strip steel with the marks is discharged from the flattening machine, and unloading the tension of the strip steel.
Step six: the distance between two thin lines was measured and defined as d.
Step seven: and calculating the elongation of the strip steel under the current leveling force by using the formula (D-D)/D.
And (3) measuring the elongation of the strip steel when the leveling force is 200 tons:
repeating the first step to the third step of measuring the elongation of the strip steel when the leveling force is 160 tons;
setting the leveling force of a leveling machine to 200 tons, and leveling the strip steel;
and repeating the fifth step to the seventh step of measuring the elongation of the strip steel when the leveling force is 160 tons.
And (3) measuring the elongation of the strip steel when the leveling force is 250 tons:
repeating the first step to the third step of measuring the elongation of the strip steel when the leveling force is 160 tons;
setting the leveling force of a leveling machine to 250 tons, and leveling the strip steel;
and repeating the fifth step to the seventh step of measuring the elongation of the strip steel when the leveling force is 160 tons.
And by analogy, finally, respectively measuring the elongation of the strip steel under the leveling forces of 160 tons, 200 tons, 250 tons, 300 tons, 350 tons, 400 tons and 500 tons, and performing linear fitting on the measurement results to form the result shown in the attached figure 2 of the specification. And calculating the elongation of the strip steel with the specification under any leveling force by using the result.
Method two
The embodiment can accurately measure the elongation of the strip steel at different positions in the width direction under the same leveling force condition.
The width of the gap of the distance ruler is 0.5mm, the depth of the gap is 8mm, the gap distance is 0.5m, and the diameter of the needle head of the hard alloy scriber is 0.2 mm. Strip steel with the thickness of 3mm and the width of 1200mm is selected for measurement.
The strip is threaded by the temper mill, the strip steel is gripped by the coiling machine, and the tension of the strip steel is removed after the tension required by the process can be provided.
And (3) measuring the elongation at different positions in the width direction of the strip steel when the leveling force is 300 tons:
the method comprises the following steps: selecting strip steel which is uncoiled and does not enter a temper mill, wherein the strip steel is in the same area in the length direction of the strip steel and is parallel to the length direction of the strip steel, placing distance scales in the width direction of the strip steel 100mm away from the transmission side edge part, the middle position and the operation side edge part 100mm respectively, and utilizing a hard alloy scriber to carve fine lines in two rectangular notches of each distance scale respectively, wherein the line width is less than 0.2 mm.
Step two: and marking the fine lines carved at different positions by using a gel pen ring.
Step three: respectively measuring the distances between the thin lines of the strip steel in the width direction and the transmission side edge part 100mm, between the thin lines and the operation side edge part 100mm, and defining the distances as DDs、DC、DOs。
Step four: the leveling force of the leveling machine is set to 300 tons, and the strip steel is leveled.
Step five: and (4) stopping flattening after the strip steel with the marks is discharged from the flattening machine, and unloading the tension of the strip steel.
Step six: respectively measuring the distances between the thin lines 100mm from the transmission side edge part, the middle position and the operation side edge part in the width direction of the strip steel, and defining the distances as dDs、dC、dOs。
Step seven: using the formula (d)Ds-DDs)/DDsAnd calculating the elongation of the strip steel in the width direction 100mm away from the transmission side edge part under the leveling force of 300 tons. In the same manner, the elongation at a flattening force of 300 tons at a widthwise intermediate position of the strip and 100mm from the operating side edge portion can be calculated.
The extension distribution condition of the strip steel in the width direction before and after the strip steel is leveled can be obtained through the difference value of the extension rates in the width direction.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. The method for measuring the flat elongation of the strip steel is characterized by comprising the following steps of:
placing a distance ruler on the surface of strip steel, wherein two notches vertical to the measuring surface of the distance ruler are formed in the distance ruler, a scriber carves two thin lines which are vertical to the length direction of the strip steel and serve as positioning marks on the surface of the strip steel before being leveled in the notches according to marks of the distance ruler, the strip steel before being leveled is strip steel which is not tensioned and not leveled by an uncoiler and a coiler under the condition that the coiler can clamp the strip steel, the width of the notches is 0.3-1mm, the depth of the notches is 5-10mm, the distance of the notches is 0.3-1.0m, and the width of the thin lines is less than 0.2 mm;
measuring the distance D between the two thin lines;
leveling the strip steel with the positioning marking thin lines, removing the tension of the strip steel after leveling, and measuring the distance d between the two thin lines again;
the actual elongation rate of the flat strip steel is (D-D)/D.
2. The method for measuring the strip steel flattening elongation according to claim 1, characterized in that:
the scriber is a hard alloy scriber.
3. The method for measuring the strip steel flattening elongation according to claim 1, characterized in that:
the hardness of the scriber is greater than that of the strip steel.
4. The method for measuring the strip steel flattening elongation according to claim 1, characterized in that:
the diameter of the needle head of the scriber is 0.1-0.3 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010392271.1A CN111659754B (en) | 2020-05-11 | 2020-05-11 | Method for measuring flat elongation of strip steel |
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| CN202010392271.1A CN111659754B (en) | 2020-05-11 | 2020-05-11 | Method for measuring flat elongation of strip steel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006110552A (en) * | 2004-10-12 | 2006-04-27 | Nippon Steel Corp | Method and apparatus for measuring distribution of elongation percentage in width direction of steel sheet |
| KR20120032865A (en) * | 2010-09-29 | 2012-04-06 | 현대제철 주식회사 | Apparatus for measuring elongation of skin pass mill |
| CN105268766A (en) * | 2014-07-12 | 2016-01-27 | 鞍钢股份有限公司 | Calibration method for ductility of temper mill |
| CN109174978A (en) * | 2018-08-29 | 2019-01-11 | 马鞍山钢铁股份有限公司 | A kind of calculation method overcoming planisher elongation percentage measurement defect |
| CN209408467U (en) * | 2018-12-18 | 2019-09-20 | 鞍钢股份有限公司 | A kind of gauge length device for dotting of on-line proving finishing elongation percentage |
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2020
- 2020-05-11 CN CN202010392271.1A patent/CN111659754B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006110552A (en) * | 2004-10-12 | 2006-04-27 | Nippon Steel Corp | Method and apparatus for measuring distribution of elongation percentage in width direction of steel sheet |
| KR20120032865A (en) * | 2010-09-29 | 2012-04-06 | 현대제철 주식회사 | Apparatus for measuring elongation of skin pass mill |
| CN105268766A (en) * | 2014-07-12 | 2016-01-27 | 鞍钢股份有限公司 | Calibration method for ductility of temper mill |
| CN109174978A (en) * | 2018-08-29 | 2019-01-11 | 马鞍山钢铁股份有限公司 | A kind of calculation method overcoming planisher elongation percentage measurement defect |
| CN209408467U (en) * | 2018-12-18 | 2019-09-20 | 鞍钢股份有限公司 | A kind of gauge length device for dotting of on-line proving finishing elongation percentage |
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