CN113664052A - Real-time on-line determination device and method for elongation after full-length fracture of cold-rolled thin strip steel - Google Patents
Real-time on-line determination device and method for elongation after full-length fracture of cold-rolled thin strip steel Download PDFInfo
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- CN113664052A CN113664052A CN202110863826.0A CN202110863826A CN113664052A CN 113664052 A CN113664052 A CN 113664052A CN 202110863826 A CN202110863826 A CN 202110863826A CN 113664052 A CN113664052 A CN 113664052A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
Abstract
The invention provides a real-time on-line judgment device and method for the elongation after full-length fracture of a cold-rolled thin strip. According to whether the on-line measured value of the total length of the strip steel meets the production requirement of the elongation after fracture of the strip steel or not, the present elongation after fracture of the strip steel is judged, and a total length judgment result is given. The continuous detection, classification and recording of the production quality of the steel plate are realized, and the defects that the numerical value is obtained by the conventional steel plate side tensile test, the data time lag is large, the data is incomplete and the like are overcome.
Description
Technical Field
The invention relates to the field of nondestructive testing, in particular to a real-time online determination device and method for the elongation after full-length fracture of cold-rolled thin strip steel.
Background
In the production of cold-rolled strip steel, low-carbon steel is an important raw material for downstream users of steel mills, such as automobiles and household electrical appliances, because of the easy processability. The downstream users have strict requirements on various indexes of the base material performance of the strip steel. The size and stability of the mechanical performance indexes (including strength and plasticity) of the cold-rolled sheet are important standards for measuring the quality of products, and are main bases for product design and material selection. Providing the strip steel with accurate and qualified mechanical property indexes for users is one of the precondition for improving the market competitiveness of steel mills.
The elongation after fracture is the main characteristic parameter of the plasticity of the material, and is measured on a sample after the fracture. In the current off-line tensile test, in order to measure the elongation after fracture, the broken parts of the test sample are carefully matched together to make the axes thereof in the same straight line, and special measures are taken to ensure that the broken parts of the test sample are properly contacted to measure the gauge length after fracture of the test sample. The calculation method is as follows:
in the formula: l is0-original gauge length of the sample, mm;
Luand the gauge length mm of the spliced broken sample.
For cold rolled low carbon steel sheet, the elongation after break ranged from 20 to 60%, and the strip elongation after break EL diagram is shown in fig. 1.
At present, the detection of the elongation of the cold-rolled thin strip after fracture by domestic iron and steel enterprises is mainly an off-line stretching method. An off-line stretching method: this is the method widely used at present. The method comprises the steps of cutting a sample at a certain part of a coil of strip steel, such as a head part and a tail part, then sending the sample to a tensile testing machine for tensile testing, and obtaining the elongation value after fracture of the sample, thereby estimating the elongation value after fracture of the coil of strip steel. The advantages of this method are simplicity, direct results, and high accuracy. However, this method has the following disadvantages: first, data skew is large, help to the production process is limited, online control is more silent. And secondly, the data is incomplete, and only the values of the head and the tail of the coiled steel can be reflected. Thirdly, the shearing is wasted. When a unit is in production, the unit is shut down or is in low-speed production for some reason, and in order to maintain the experience judgment that the head and the tail are qualified and the middle is also qualified, a section of strip steel which is suspected to be unqualified is usually cut off at the moment. The cutting amount has no judgment standard, and can only be cut as much as possible, which obviously causes waste. Fourthly, people need to operate beside the aircraft all the time, the labor intensity is high, and the labor cost is high.
Disclosure of Invention
The invention provides a device and a method for judging the elongation after full-length fracture of a cold-rolled thin strip steel in real time in order to solve the problems in the prior art, which finish the on-line judgment of the elongation after fracture of a typical steel type by applying comprehensive electromagnetic detection on the running strip steel, acquire the data of the elongation after fracture of the full length of a cold-rolled sheet in real time, realize the on-line quality control, reduce the data time lag, reduce the off-line tensile test quantity and optimize the production process.
The invention provides a real-time online judging device for the elongation after full-length fracture of a cold-rolled thin strip, which comprises two carrier rollers arranged in front and at back, wherein a strip is placed on the carrier rollers and moves along the horizontal direction, an electromagnetic detection unit is arranged between the two carrier rollers, and the electromagnetic detection unit is connected with a control unit; the electromagnetic detection unit comprises a distance measuring instrument connected through a probe lifting device, and the bottom of the probe lifting device is connected with a horizontal displacement device; the control unit comprises a detection sensing unit controller, a probe vertical and horizontal displacement controller and a calculation unit.
The electromagnetic detection unit is provided with a mechanical limiting device, and the mechanical limiting device limits the electromagnetic detection unit and the strip steel to keep a safe distance.
The running speed of the strip steel is 0-300 m/min.
The invention also provides a real-time online determination method for the elongation after full-length fracture of the cold-rolled thin strip steel, which comprises the following steps:
1) taking a group of electromagnetic parameter sets measured on line, actual fluctuation values of the distance between the strip steel and the sensor and the current strip steel thickness as input, and calculating to obtain the elongation after fracture through a unitary linear regression statistical model, wherein the basic form of the employed unitary linear regression statistical model is as follows:
the conditions are satisfied: g is more than or equal to 2 and less than or equal to 6
Wherein EL is the elongation after fracture of the material, A is a constant term, XiFor the desired electromagnetic parameter signal, CiObtaining A and C through data test for corresponding regression coefficients;
2) and judging the current elongation after fracture of the strip steel according to whether the online measured value of the full length of the strip steel meets the production requirement of the elongation after fracture of the strip steel or not, giving a full length judgment result, and counting. The production requirement of the elongation after fracture of the strip steel means that the elongation after fracture of the strip steel cannot exceed a corresponding upper limit value and cannot be lower than a corresponding lower limit value.
In the statistical process, at least one real-time detection point is arranged on the steel coil level, and the elongation after fracture of the real-time detection point is within the upper and lower limit ranges based on the contract requirements of the user, the real-time detection value is regarded as qualified and is marked as 1; if the elongation after fracture of the real-time detection point exceeds the upper limit value based on the user contract requirement or is lower than the lower limit value based on the user contract requirement, the real-time detection value is regarded as unqualified and is marked as 0; and finally forming a statistical report of the judgment result of the whole coil of strip steel.
The invention has the beneficial effects that: within one month of field operation, the uploading delay of the related judgment result is less than or equal to 10s, the omission factor is less than or equal to 1%, and the on-line real-time detection value qualification rate of the detection point is more than 90% within the relative error precision range of 10%.
Drawings
FIG. 1 is a schematic diagram of the elongation after break EL of a strip steel.
Fig. 2 is a system composition of the present invention.
Fig. 3 is a schematic diagram of an online working position of an electromagnetic detection unit in a field hardware unit.
FIG. 4 is a schematic diagram of a lowered position of the electromagnetic detection unit in the field hardware unit.
FIG. 5 is a block diagram of a data support system.
FIG. 6 is a decision flow diagram of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The system components of the present invention are shown in detail in fig. 2. The complete detection system comprises an online detection hardware system, a matched software system, a mathematical model, corresponding data service and support and the like.
The hardware detection system is shown in fig. 3. The strip steel 1 usually runs at the speed of 0-300m/min, and the running track line of the strip steel is stabilized by the strip steel through two carrier rollers 2 which are arranged in front and back. An electromagnetic detection unit 3 which can be lifted and transversely moved in the width direction is arranged between the carrier rollers 2. The electromagnetic detection unit 3 is arranged below the running strip steel, and the lifting and the transverse moving of the electromagnetic detection unit are realized by a control system. The hardware detection system also comprises a distance measuring instrument 4 which is used for measuring the distance between the electromagnetic detection unit 3 and the lower surface of the strip steel 1 in real time and sending the distance to the control computer. The probe lifting device 5 realizes the up-and-down action of the electromagnetic detection unit 3, and the mechanical limiting device 6 ensures the safe distance between the electromagnetic detection unit 3 and the strip steel 1. Fig. 3 and 4 show the on-line and descending positions of the electromagnetic detection unit, respectively.
In particular, the distance 7 between the lower surface of the strip and the probe surface is a critical parameter, the strip spacing is slightly fluctuating due to the effects of external factors such as the running jitter of the strip, and the plate-like fluctuation inherent to the thin strip, measured in real time by the distance measuring instrument 4, the target value is 5mm, the allowable error is ± 1mm, and this parameter is called Gap, and is used as an input of the detection mathematical model. Particularly, the measurement distance G is measured, when G is larger than or equal to 4mm and smaller than or equal to 6mm, the measurement is effective, the detection result can be corrected, when G is larger than 6mm or G is smaller than 4mm, the system is in an abnormal state, the detection condition is not met, and the detection is ineffective.
The digital steel coil meter-level tracking is used as a carrier, the production process data of the strip steel per meter is recorded, the contract information (from cloud) of the strip steel is obtained through a digital steel coil platform, and the contract information is combined with the real-time output result of the elongation of the strip steel after the strip steel is broken, so that the full-length online judgment is realized. Data support and services for the OND project by digital steel coil include digital steel coil and data communication of L4, cloud, and L1. The data support system is shown in block diagram form in FIG. 5.
The determination process of the present invention is shown in fig. 6, a group of electromagnetic parameter sets measured on line, the actual fluctuation value of the distance between the strip steel and the sensor, and the current strip steel thickness are used as input, and the elongation after fracture is calculated by a unitary linear regression statistical model, the basic form of the employed unitary linear regression statistical model is as follows:
the conditions are satisfied: g is more than or equal to 2 and less than or equal to 6
Wherein EL is the elongation after fracture of the material, A is a constant term, XiFor the desired electromagnetic parameter signal, CiObtaining A and C through data test for corresponding regression coefficients;
2) and judging the current elongation after fracture of the strip steel according to whether the online measured value of the full length of the strip steel meets the production requirement of the elongation after fracture of the strip steel or not, giving a full length judgment result, and counting. The production requirement of the elongation after fracture of the strip steel means that the elongation after fracture of the strip steel cannot exceed a corresponding upper limit value and cannot be lower than a corresponding lower limit value.
In the statistical process, at least one real-time detection point is arranged on the steel coil level, and the elongation after fracture of the real-time detection point is within the upper and lower limit ranges based on the contract requirements of the user, the real-time detection value is regarded as qualified and is marked as 1; if the elongation after fracture of the real-time detection point exceeds the upper limit value based on the user contract requirement or is lower than the lower limit value based on the user contract requirement, the real-time detection value is regarded as unqualified and is marked as 0; and finally forming a statistical report of the judgment result of the whole coil of strip steel.
The technology is applied to a production line, and the technical scheme is referred to in the foregoing for the on-line judgment of the full length of the elongation after fracture of a coil of steel.
The contract information of the strip steel acquired by the digital steel coil platform is shown in the following table.
TABLE 1 contract information data set (part)
| | EL_MAX | EL_MIN | |
| 1 | 99.9 | 32 |
The model was used for real-time detection of a coil of strip steel, and the detection values of the elongation after break in the full length direction and the determination output results are shown in the following table. Compared with the prior art, the test can be carried out only by shearing the sample, and the data volume and the real-time performance are both greatly improved.
TABLE 2 real-time detection and determination results (partial)
The invention is applied to an online judging system for the mechanical performance quality of the cold-rolled strip steel, carries out real-time online judgment on the indexes of the elongation and the like of the cold-rolled strip steel after fracture, realizes the continuous detection, classification and recording of the production quality of the steel plate, and plays a very positive role in improving the production efficiency, the product quality and the product competitiveness.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (6)
1. The utility model provides a real-time online decision maker of cold rolling thin strip steel full length percentage elongation after breaking which characterized in that: the belt conveyor comprises two carrier rollers which are arranged in a front-back manner, a belt is placed on the carrier rollers and moves along the horizontal direction, an electromagnetic detection unit is arranged between the two carrier rollers, and the electromagnetic detection unit is connected with a control unit; the electromagnetic detection unit comprises a distance measuring instrument connected through a probe lifting device, and the bottom of the probe lifting device is connected with a horizontal displacement device; the control unit comprises a detection sensing unit controller, a probe vertical and horizontal displacement controller and a calculation unit.
2. The device for real-time online determination of the full-length post-fracture elongation of cold-rolled thin strip steel according to claim 1, characterized in that: the electromagnetic detection unit is provided with a mechanical limiting device, and the mechanical limiting device limits the electromagnetic detection unit and the strip steel to keep a safe distance.
3. The device for real-time online determination of the full-length post-fracture elongation of cold-rolled thin strip steel according to claim 1, characterized in that: the running speed of the strip steel is 0-300 m/min.
4. A real-time online determination method for elongation after full-length fracture of cold-rolled thin strip steel is characterized by comprising the following steps:
1) taking a group of electromagnetic parameter sets measured on line, actual fluctuation values of the distance between the strip steel and the sensor and the current strip steel thickness as input, and calculating to obtain the elongation after fracture through a unitary linear regression statistical model, wherein the basic form of the employed unitary linear regression statistical model is as follows:
the conditions are satisfied: g is more than or equal to 2 and less than or equal to 6
Wherein EL is the elongation after fracture of the material, A is a constant term, XiFor the desired electromagnetic parameter signal, CiObtaining A and C through data test for corresponding regression coefficients;
2) and judging the current elongation after fracture of the strip steel according to whether the online measured value of the full length of the strip steel meets the production requirement of the elongation after fracture of the strip steel or not, giving a full length judgment result, and counting.
5. The method for real-time online determination of the full-length post-fracture elongation of the cold-rolled thin strip steel according to claim 4, characterized by comprising the following steps: the production requirement of the elongation after fracture of the strip steel in the step 2) means that the elongation after fracture of the strip steel cannot exceed a corresponding upper limit value and cannot be lower than a corresponding lower limit value.
6. The method for real-time on-line determination of the elongation after full-length fracture of cold-rolled thin strip steel according to claim 4, characterized by comprising the following steps: in the statistical process of the step 2), at least one real-time detection point is arranged on the basis of the steel coil level, and if the elongation after fracture of the real-time detection point is within the upper and lower limit ranges based on the contract requirements of the user, the real-time detection value is regarded as qualified and is marked as 1; if the elongation after fracture of the real-time detection point exceeds the upper limit value based on the user contract requirement or is lower than the lower limit value based on the user contract requirement, the real-time detection value is regarded as unqualified and is marked as 0; and finally forming a statistical report of the judgment result of the whole coil of strip steel.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080223145A1 (en) * | 2007-03-13 | 2008-09-18 | Bridgestone Firestone North America Tire, Llc | Electromagnetic rotation and stability apparatus |
| CN108508061A (en) * | 2018-03-09 | 2018-09-07 | 上海宝钢工业技术服务有限公司 | The online mechanics properties testing system and method for steel plate |
| CN108982657A (en) * | 2018-06-08 | 2018-12-11 | 南京航空航天大学 | A kind of ferrimagnet yield strength method for parameter estimation based on impulse eddy current |
| CN114112736A (en) * | 2020-08-28 | 2022-03-01 | 宝山钢铁股份有限公司 | Online measuring device and method for determining fracture elongation of low-carbon steel cold-rolled sheet |
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- 2021-07-29 CN CN202110863826.0A patent/CN113664052A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080223145A1 (en) * | 2007-03-13 | 2008-09-18 | Bridgestone Firestone North America Tire, Llc | Electromagnetic rotation and stability apparatus |
| CN108508061A (en) * | 2018-03-09 | 2018-09-07 | 上海宝钢工业技术服务有限公司 | The online mechanics properties testing system and method for steel plate |
| CN108982657A (en) * | 2018-06-08 | 2018-12-11 | 南京航空航天大学 | A kind of ferrimagnet yield strength method for parameter estimation based on impulse eddy current |
| CN114112736A (en) * | 2020-08-28 | 2022-03-01 | 宝山钢铁股份有限公司 | Online measuring device and method for determining fracture elongation of low-carbon steel cold-rolled sheet |
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