CN115446126B - Steel biting and throwing method for hot rolling fixed-width press - Google Patents
Steel biting and throwing method for hot rolling fixed-width press Download PDFInfo
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- CN115446126B CN115446126B CN202211057677.XA CN202211057677A CN115446126B CN 115446126 B CN115446126 B CN 115446126B CN 202211057677 A CN202211057677 A CN 202211057677A CN 115446126 B CN115446126 B CN 115446126B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005098 hot rolling Methods 0.000 title claims abstract description 12
- 238000010009 beating Methods 0.000 claims abstract description 46
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 239000002184 metal Substances 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000005498 polishing Methods 0.000 abstract 1
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
Abstract
The invention provides a steel biting and throwing method of a hot rolling fixed-width press, which comprises the following steps: setting a blank beating mode during rolling by a fixed-width press; load current generated by a load in each rolling period is obtained; judging the state of the load current, and then judging the biting and throwing state of the wide machine; introducing a fixed-width pressure theory to calculate the number of times of beating and judging the actual number of times of beating; further calculating theoretical beating times according to the slab length transferred from the second stage to the first stage; detecting the number of sawteeth, namely the actual beating times, of the load current when beating; judging whether the acquired state of the wide press is consistent; outputting the current state of the wide press. The method is simple and easy to implement, and by recording the detection of the number of times of the load flapping and the detection of the state of the load flapping, a perfect interlocking protection is formed, and the accuracy and reliability of the biting and polishing signals of the fixed-width press are ensured.
Description
Technical Field
The invention relates to the technical field of automatic control of steel rolling, in particular to a method for biting and throwing steel by a hot rolling fixed-width press.
Background
The width-fixing press mainly aims at roughly adjusting the width of a plate blank and rolling the plate blank into an intermediate blank with a rolling width suitable for a rough rolling unit. The conventional rolling mode of the rolling mill is roller rolling, the load rolling force and the load current are continuously and stably changed, and the biting and throwing of steel are judged mainly by virtue of a pressure head. When the fixed-width press rolls, a mode of beating a plate blank by a module is adopted, the load rolling force and the load current are in a saw-tooth shape, and the biting and throwing steel signals are judged together through the pressure head rolling force and the hot metal detector. The fixed-width press is in a beating rolling mode, so that the damage rate of the pressure head is extremely high due to the fact that the pressure head is impacted very instantly, and finally, the pressure head is abandoned to adopt a separate hot metal detector to judge the biting and throwing of steel. Due to the influence of factors such as a mechanical structure and a working environment, the hot metal detector cannot be arranged too close to the rolling mill, and can only be close to the rolling mill as much as possible, and the fact that the hot metal detector for biting and throwing steel of the wide press is 1.2 meters away from the actual biting and throwing steel point causes that the throwing steel point of the fixed-width press is 1.2 meters away from the actual throwing steel point is judged. The fixed-width press module is still idle for about 5 seconds after the slab is actually shot, and the slab moves in the fixed-width press at the rolling speed of 0.33m/s until the hot metal detector at the outlet of the fixed-width press detects that the HMD303A/B is OFF and then is considered to throw steel. The hot metal detector is influenced by the environment and the service life, and sometimes fails to send out error signals, so that the phenomena of inaccurate steel biting and casting signals, missing beats and the like are caused. The load current changes along with the change of the load size and can directly reflect the load state, so that a technology for judging the biting and throwing of the steel by utilizing the load current fed back by the frequency converter is developed.
Disclosure of Invention
According to the technical problems mentioned in the background art, a method for biting and throwing steel by a hot rolling fixed-width press is provided. The invention mainly can realize the accurate control of the biting and throwing point of the fixed-width press, and the fixed-width press bites and throws steel according to the actual rolling condition.
The invention comprises a technical scheme, in particular comprising the following steps:
a method for biting and throwing steel by a hot rolling fixed-width press comprises the following steps:
step 1: setting a blank beating mode during rolling by a fixed-width press;
step 2: load current generated by a load in each rolling period is obtained;
step 3: judging the state of the load current, and judging the state of the wide machine; the state of the width fixing machine comprises: biting and throwing steel; when the load current is larger than the steel biting load current threshold value, the steel biting state is obtained, and when the load current is smaller than the steel throwing load current threshold value, the steel throwing state is obtained;
step 4: the method comprises the steps of introducing fixed-width pressure theory beating times calculation and actual beating times judgment for ensuring the accuracy of a steel throwing signal; judging a steel throwing signal together through the beating times and the load state of the width fixing machine;
step 5: further calculating theoretical beating times according to the slab length transferred from the second stage to the first stage;
step 6: detecting the number of sawteeth, namely the actual beating times, of the load current when beating;
step 7: the actual beating times are counted, so that the walking position of the slab is further judged; when the actual beating times of the width-fixed press machine is larger than the theoretical calculated beating times and the load current does not have the load beating current in one rolling period, the width-fixed press machine can be judged to be in a steel throwing state;
step 8: judging whether the state of the width-fixing machine obtained in the step 3 is consistent with the state of the width-pressing machine obtained in the step 7; when the state of the width fixing machine in the step 3 is consistent with the state of the width obtaining press in the step 7, executing the step 9; when the state of the width fixing machine in the step 3 is inconsistent with the state of the width obtaining press in the step 7, the step 2 is re-executed until the state of the step 3 is consistent with the state of the step 7;
step 9: outputting the current state of the wide press.
Compared with the prior art, the invention has the following advantages:
the method is simple and easy to implement, and the device can be implemented without adding any hardware and completing the implementation by means of software programming and calculation by means of load current fed back by the frequency converter. By acquiring the detection of the number of times of the load flapping and the detection of the state of the load flapping, a perfect interlocking protection is formed, and the accuracy and reliability of the steel biting and throwing signals of the fixed-width press are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
Fig. 1 is a waveform diagram of a load current in a method for judging biting and throwing steel in the prior art.
FIG. 2 is a waveform diagram of load current for judging the method for biting and throwing steel according to the present invention.
FIG. 3 shows the actual number of beats determination according to the present invention.
FIG. 4 is a graph showing the number of beats based on the principle of introducing constant width pressure.
Fig. 5 is a schematic view of the apparatus of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 2 to 5, the invention provides a steel throwing method of a hot rolling fixed-width press, which comprises the following steps:
step 1: setting a blank beating mode during rolling by a fixed-width press; in this application, the load current generated by the internal load is a saw-tooth load current.
Step 2: load current generated by a load in each rolling period is obtained; in this application, as a preferred embodiment, the rolling cycle is 1.2 seconds. It will be appreciated that in this embodiment the length of each step of the machine is 400mm.
Step 3: judging the state of the load current and then judging the state of the wide machine; the state of the width fixing machine comprises: biting and throwing steel. And when the load current is smaller than the steel throwing load current threshold value, the steel throwing state is obtained. In the present application, the determination method for the state of the load current is as follows: when the no-load flapping is performed, the load current is about 7.5% of the rated load current, and when the load current is greater than the no-load flapping load current, the state of the no-load flapping is the state of biting steel; when the load current is less than 12.5% of the rated load current, the wide press is judged to be in an idle beating state, namely in a steel throwing state. Namely, a load current which is 12.5 percent higher than the rated load current exists every 1.2 seconds, and the fixed-width machine bitten steel casting is judged by judging the state of the load current. Therefore, the steel throwing state can be effectively and accurately judged, and the method is advanced compared with the steel throwing method in the prior art.
Step 4: the method comprises the steps of introducing fixed-width pressure theory beating times calculation and actual beating times judgment for ensuring the accuracy of a steel throwing signal; judging a steel throwing signal together through the beating times and the load state of the width fixing machine;
step 5: further calculating theoretical beating times according to the slab length transferred from the second stage to the first stage; dividing the length of the current plate blank of the fixed-width press by the step length to obtain the theoretical beating times.
Step 6: detecting the number of sawteeth, namely the actual beating times, of the load current when beating;
step 7: further judging the walking position of the slab by counting the beating times; when the actual beating times of the width-determined press machine is larger than the theoretical calculated beating times, and the main load current does not have the on-load beating current within T seconds, the width-determined press machine can be judged to be in a steel throwing state; in this application, the main load current has no load tapping current for 1.2 seconds.
Step 8: judging whether the state of the width fixing machine obtained in the step 3 is consistent with the state of the width press obtained in the step 7; when the state of the width fixing machine in the step 3 is consistent with the state of the width obtaining press in the step 7, executing the step 9; and when the state of the width fixing machine in the step 3 is inconsistent with the state of the width obtaining press in the step 7, re-executing the step 2 until the state of the step 3 is consistent with the state of the step 7. According to the method, accurate steel throwing of the fixed-width press is realized by detecting the load current state and the beating times, the steel throwing point of the fixed-width press is moved forward by 1 meter and is thrown for 3 seconds in advance, and therefore the rolling rhythm is improved, and the electric energy loss and the mechanical equipment abrasion are reduced.
Step 9: outputting the current state of the wide press.
In summary, the above-mentioned manner can better realize the judgement of the overall steel throwing state, and can better advance the judgement of the overall state.
Further, in the present application, in a preferred embodiment, a plurality of hot metal detectors are disposed at the steel throwing point of the fixed-width press and on the roller table. And the hot metal detector is an HMD. As an embodiment, in this example, the inlet sensor is HMD302A/B, the cast steel sensor is HMD303A/B, the tapping sensor is HMD304, and the sensors are sequentially arranged along the rolling direction.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments. In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. The method for biting and throwing the steel by the hot rolling fixed-width press is characterized by comprising the following steps of:
step 1: setting a blank beating mode during rolling by a fixed-width press;
step 2: load current generated by a load in each rolling period is obtained;
step 3: judging the state of the load current and then judging the state of the wide press; the state of the fixed-width press comprises: biting and throwing steel; when the load current is larger than the steel biting load current threshold value, the steel biting state is obtained, and when the load current is smaller than the steel throwing load current threshold value, the steel throwing state is obtained;
the judgment mode of the state of the load current is as follows:
when no-load tapping, the load current is about 7.5% of rated load current, and when the load current is larger than the load current when no-load tapping and reaches a steel biting load current threshold value, namely 12.5% of rated load current, the steel biting state is realized;
when the load current is smaller than the load current threshold value of the steel throwing, namely 12.5% of rated load current, judging that the wide press is in an idle beating state, namely in a steel throwing state;
step 4: the method comprises the steps of introducing fixed-width pressure theory beating times calculation and actual beating times judgment for ensuring the accuracy of a steel throwing signal; judging a steel throwing signal together by the beating times and the load current of the fixed-width press;
step 5: calculating theoretical beating times according to the length of the slab transferred from the second stage to the first stage; dividing the length of the current slab of the fixed-width press by the step length to obtain theoretical beating times;
step 6: detecting the number of sawteeth, namely the actual beating times, of the load current when beating;
step 7: the actual beating times are counted, and the walking position of the slab is judged; when the actual beating times of the wide-width press machine is larger than the theoretical beating times and the load current does not have the on-load beating current in one rolling period, the wide-width press machine can be judged to be in a steel throwing state;
step 8: judging whether the state of the fixed-width press machine obtained in the step 3 is consistent with the state of the fixed-width press machine obtained in the step 7; when the state of the fixed-width press machine in the step 3 is consistent with the state of the fixed-width press machine obtained in the step 7, executing the step 9; when the state of the fixed-width press machine in the step 3 is inconsistent with the state of the fixed-width press machine obtained in the step 7, the step 2 is re-executed until the state of the step 3 is consistent with the state of the step 7;
step 9: outputting the state of the current fixed-width press.
2. The method for biting and casting steel by a hot rolling constant width press according to claim 1, wherein the rolling period in the step 2 is 1.2 seconds.
3. The method for biting and throwing steel by a hot rolling fixed-width press according to claim 1, wherein the step length of each time the fixed-width press beats a slab is set to be 400mm.
4. The method for biting and casting steel by a hot rolling fixed-width press according to claim 1, wherein a plurality of hot metal detectors are arranged at the biting and casting steel point of the fixed-width press and on a roller way.
5. The method for biting and casting steel by a hot rolling constant width press according to claim 4, wherein said hot metal detector is HMD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211057677.XA CN115446126B (en) | 2022-08-31 | 2022-08-31 | Steel biting and throwing method for hot rolling fixed-width press |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211057677.XA CN115446126B (en) | 2022-08-31 | 2022-08-31 | Steel biting and throwing method for hot rolling fixed-width press |
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| CN115446126A CN115446126A (en) | 2022-12-09 |
| CN115446126B true CN115446126B (en) | 2024-02-13 |
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| CN202211057677.XA Active CN115446126B (en) | 2022-08-31 | 2022-08-31 | Steel biting and throwing method for hot rolling fixed-width press |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0913214A2 (en) * | 1997-10-31 | 1999-05-06 | Hitachi, Ltd. | Slab sizing press |
| CN103341499A (en) * | 2013-06-14 | 2013-10-09 | 武汉钢铁(集团)公司 | Device for tracing and detecting interior plate blank head position of fixed width machine |
| CN104438319A (en) * | 2014-10-13 | 2015-03-25 | 首钢京唐钢铁联合有限责任公司 | Rough rolling speed increasing method |
| CN105983583A (en) * | 2016-06-28 | 2016-10-05 | 首钢京唐钢铁联合有限责任公司 | Steel rejection method for outlet pinch roll of sizing machine |
| CN107159717A (en) * | 2017-06-09 | 2017-09-15 | 首钢京唐钢铁联合有限责任公司 | A kind of constant width machine control method |
-
2022
- 2022-08-31 CN CN202211057677.XA patent/CN115446126B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0913214A2 (en) * | 1997-10-31 | 1999-05-06 | Hitachi, Ltd. | Slab sizing press |
| CN103341499A (en) * | 2013-06-14 | 2013-10-09 | 武汉钢铁(集团)公司 | Device for tracing and detecting interior plate blank head position of fixed width machine |
| CN104438319A (en) * | 2014-10-13 | 2015-03-25 | 首钢京唐钢铁联合有限责任公司 | Rough rolling speed increasing method |
| CN105983583A (en) * | 2016-06-28 | 2016-10-05 | 首钢京唐钢铁联合有限责任公司 | Steel rejection method for outlet pinch roll of sizing machine |
| CN107159717A (en) * | 2017-06-09 | 2017-09-15 | 首钢京唐钢铁联合有限责任公司 | A kind of constant width machine control method |
Non-Patent Citations (1)
| Title |
|---|
| 首钢京唐热轧1580定宽机控制技术研究;王建功;;科技风(第05期);第18页 * |
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