CN110871216B - Method for preventing small hot-rolled H-shaped steel finishing mill group from clamping steel - Google Patents
Method for preventing small hot-rolled H-shaped steel finishing mill group from clamping steel Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- 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
- B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/088—H- or I-sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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Abstract
The invention discloses a method for preventing a small hot-rolled H-shaped steel finishing mill group from jamming, and belongs to the technical field of hot-rolled H-shaped steel production. The strip detector is used for detecting the strip shape of a rolled piece, and the obtained data is put into a steel clamping prejudgment condition for judgment; if judging that the rolling gap value meets the conditions, storing the roll gap value of the previous rolling mill, and directly calling the roll gap value for production in the production process; if the condition is judged not to be met, determining how to adjust the roll gap value of the previous rolling mill according to the size relation between the width and the height of the finished flange and the deviation position of the head of the rolled piece; the upper detection piece collects the profile data of the rolled piece, and draws an image according to the data, so that a worker can visually judge the steel clamping risk according to the image while comparing the data, when the steel clamping risk is judged to be high, the worker can conveniently respond in time, the steel clamping is avoided, the equipment damage caused by the steel clamping is effectively avoided, and the production is carried out stably and efficiently.
Description
Technical Field
The invention relates to the technical field of hot-rolled H-shaped steel production, in particular to a method for preventing a small hot-rolled H-shaped steel finishing mill set from clamping steel.
Background
The H-shaped steel is an economic section efficient section with more optimized section area distribution and more reasonable strength-to-weight ratio. Because all parts of the H-shaped steel are arranged at right angles, the H-shaped steel has the advantages of strong bending resistance, simple construction, cost saving, light structure weight and the like in all directions and is widely applied. The H-shaped steel can be produced by two methods of welding or rolling. The H-shaped steel is welded by cutting the strip steel with proper thickness into proper width and welding the flange and the web together on a continuous welding unit. The welding of H-shaped steel has the defects of large metal consumption, difficult guarantee of uniform product performance, limited dimension and specification and the like. Therefore, H-shaped steel is produced mainly by a rolling method. In modern steel rolling production, a universal mill is used for rolling H-shaped steel.
The small-size hot-rolled H-shaped steel is a common section steel type, a finish rolling section of the small-size hot-rolled H-shaped steel is usually a continuous rolling unit, and the small-size hot-rolled H-shaped steel is similar to a finish rolling section of a plate and a wire rod, so that various automatic detection devices and analysis systems can be installed theoretically, and the stability and the high efficiency of the production process are ensured. However, the production process of the H-shaped steel is complex and changeable due to irregular section shape and various specifications, and the value of a common automatic detection system is difficult to embody. Therefore, at present, no strip detection and analysis control system suitable for a small-specification hot-rolled H-shaped steel finishing mill group exists. The strip detection of the rolled piece at the finish rolling section is based on manual experience, accurate measurement and data accumulation analysis cannot be realized, and steel clamping occurs occasionally, so that the production efficiency is low and the product quality is unstable.
Through search, the Chinese patent number ZL201510430812.4 has the invention name: the edging control method of the vertical rolling mill steel blocking applies for the date: 21/7/2015. The control method of the application comprises the following steps: step 1, carrying out vertical roll rough rolling and steel polishing processes; step 2, enabling the vertical roller to enter a tail clamping mode, and pressing a tail clamping position; step 3, judging the contact condition of the vertical roll and the steel plate; step 4, saving the roll gap value as the width of the plate blank; step 5, judging the size relation between the width of the plate blank and the set roll gap; and 6, adjusting the set value of the working position. The edging control method for the vertical roller mill steel blocking of the application realizes that the steel blocking can not be generated due to overlarge rolling reduction when a steel plate enters the vertical roller mill for normal rolling, can ensure that the vertical roller mill bites the steel smoothly, and achieves the purposes of protecting the vertical roller mill, accurately controlling the rolling reduction and improving the yield. However, the application cannot judge whether the rolled piece is blocked before entering the rolling mill, and the roll gap value is adjusted after the rolled piece is blocked, so that the problem that equipment is easy to damage after the steel is blocked is caused.
Disclosure of Invention
1. Technical problem to be solved by the invention
In view of the problem that steel clamping is easy to occur in the process of rolling a rolled piece by a hot-rolled H-shaped steel finishing mill group in the prior art, and further equipment damage is caused, the invention provides a method for preventing steel clamping of a small hot-rolled H-shaped steel finishing mill group.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a method for preventing a small hot-rolled H-shaped steel finishing mill group from jamming, which comprises the following steps:
step one, detecting rolled piece data by using a strip detector;
judging whether the specification data of the rolled piece measured by the strip detector meets a steel clamping prejudgment condition;
step three, if the pre-judging condition is met, the roll gap value of the previous rolling mill is stored, and if the pre-judging condition is not met, the size relation between the finished product flange width B and the finished product height H is judged;
judging the head deviation position of the current rolling mill inlet rolled piece according to the data measured by the strip detector;
step five, adjusting and storing the roll gap value of the previous rolling mill according to the size relation between the flange width B of the finished product obtained in the step three and the height H of the finished product and the deviation position of the head of the rolled piece obtained in the step four;
and step six, rolling the rolled piece by using the stored roll gap value, and repeating the steps one to five until the rolled piece meets the steel clamping prejudgment condition.
Furthermore, in the first step, the strip detector includes an upper detection member, an OS-side detection member and a DS-side detection member, the upper detection member is a plane profile scanner, and the OS-side detection member and the DS-side detection member are distance detectors.
Furthermore, in the first step, the measured data of the upper detecting element is the offset of the rolled piece from the central line in the horizontal direction of rolling, and the OS-side detecting element and the DS-side detecting element detect the offset of the head of the rolled piece from the central line in the horizontal direction.
Furthermore, the steel clamping prejudging condition in the second step is
Wherein k isi-1Detecting the offset of the head of the rolled piece from the centre line for the OS-side and DS-side detection elements, biThe width of the guide at the inlet side of the i-th rolling mill, hi-1The width of the outlet rolled piece of the i-1 rolling mill.
Furthermore, the relationship between the flange width B of the finished product and the height H of the finished product is judged in the third step, and if B is more than or equal to 1.5H, the roll gap value of the previous vertical rolling mill is adjusted in the subsequent step; and if B is less than 1.5H, the subsequent step adjusts the roll gap value of the previous flat rolling mill.
Furthermore, in the fourth step, if the head of the rolled piece is judged to bend to the DS side, the roll gap value of the OS side of the previous rolling mill is increased or the roll gap value of the DS side is decreased in the subsequent step; and if the head of the rolled piece is bent to the OS side, increasing the DS side roll gap value of the previous rolling mill or reducing the OS side roll gap value.
Furthermore, in the fifth step, when B is more than or equal to 1.5H, the adjustment value of the roll gap of the counter rolling mill is adjusted to be 1.0-2.0mm each time; when B is less than 1.5H, the roll gap adjustment value of the flat rolling mill is 0.5-1.0mm each time.
Furthermore, the upper detection piece collects the data of the rolled piece, and an image is drawn according to the data, so that the data is compared with the central line of the rolled piece, and the offset is calculated.
Furthermore, the OS-side detector and the DS-side detector respectively detect the value of the detector for the head distance of the rolled piece, and the values measured by the OS-side detector and the DS-side detector are subtracted and divided by 2 to obtain the offset of the head of the rolled piece from the center line.
Furthermore, the upper detection piece, the OS side detection piece and the DS side detection piece are arranged between two adjacent finishing mills, and the OS side detection piece and the DS side detection piece are also arranged at the inlet of the first finishing mill.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) in view of the problem that the prior art does not have an effective method for preventing the steel from being blocked by the hot rolling H-shaped steel finishing mill group, so that the rolling mill is easy to damage and the production efficiency is low, the method for preventing the steel from being blocked by the small hot rolling H-shaped steel finishing mill group is characterized in that an upper detection piece, an OS side detection piece and a DS side detection piece are arranged between two adjacent rolling mills, the specification data of a rolled piece is measured, whether the rolled piece can pass through the rolling mill or not is judged in advance according to the steel blocking prejudgment condition, the steel blocking in the hot rolling H-shaped steel finishing process is effectively prevented, the rolling mill is not easy to damage, and the efficient and stable production is ensured.
(2) In order to prevent subsequent rolled pieces of the same specification from being blocked when passing through a rolling mill, the method for preventing the small-sized hot-rolled H-shaped steel finishing mill from being blocked provided by the invention has the advantages that after the steel blocking is pre-determined, the roll gap value of the previous rolling mill is adjusted for multiple times according to different offsets of the rolled pieces, the roll gap value is stored after the rolled pieces are adjusted to be not blocked with the rolling mill, and the roll gap value is directly called when the rolled pieces of the same specification are rolled, so that the time for readjustment is saved.
(3) According to the method for preventing the steel jamming of the small hot-rolled H-shaped steel finishing mill set, the upper detection piece collects the outline data of a rolled piece, the image is drawn according to the outline data, when the data are used for comparison, workers can judge the steel jamming risk intuitively according to the image, when the steel jamming risk is judged to be high, the workers can respond timely, and the steel jamming is avoided.
Drawings
FIG. 1 is a schematic view of the upper probe mounting position of the present invention;
FIG. 2 is a schematic view of the installation positions of the DS-side and OS-side probe members of the present invention;
FIG. 3 shows the entrance guide and its width b of the present inventioniMarking a graph;
FIG. 4 is a control flow diagram of the present invention.
The reference numbers in the figures are: 1. a rolling mill; 2. rolling pieces; 3. an upper probe member; 4. an OS-side probe; 5. a DS side probe; 6. and (6) guiding and guarding.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1
Referring to fig. 1, in this embodiment, the upper detecting member 3 is a plane profile scanner, and has the following model: DM66, which is arranged at the middle position of two adjacent rolling mills 1, and the measured data is the offset of the rolled piece 2 from the central line of the rolling direction. The upper detection piece 3 is arranged above the rolled piece 2 to collect profile data of the rolled piece, and an image is drawn according to the data, and after the image is obtained, the data is compared with a horizontal central line in the figure 2 to calculate the offset. Meanwhile, the image can visually display whether the rolled piece 2 deviates too much, so that steel clamping is caused, the worker can quickly make a response, and the steel clamping is avoided.
Referring to fig. 2, in this embodiment, the OS-side detecting element 4 and the DS-side detecting element 5 are distance detectors, and have the following types: YP500H laser range finders are respectively installed at the entrance of the first frame of finishing mill and the OS side and the DS side of the middle position of two adjacent mills of the finishing mill group. When the rolled piece 2 enters the first finishing mill and passes through an intermediate position between two adjacent finishing mills, the OS-side detecting member 4 and the DS-side detecting member 5 detect the head offset of the rolled piece 2. In the rolling process of the rolled piece 2, under the condition that no deviation occurs, the distances from the left side and the right side of the head of the rolled piece 2 to the DS side and the OS side are equal, if the head of the rolled piece 2 deviates in the rolling process, the OS-side detection piece 4 and the DS-side detection piece 5 can respectively detect the value of the head distance detector of the rolled piece 2 at the moment, and the values measured by the two detection pieces are subtracted and divided by 2 to obtain the amount of the deviation of the head of the rolled piece 2 from the horizontal center line. The rolled stock 2 is moved in the direction of the arrow, and the auxiliary lines on both sides show the extent of the entry to the rolling mill 1.
Referring to fig. 4, the method for preventing the small hot-rolled H-section finishing mill from jamming of steel of the embodiment includes the following specific steps:
step one, detecting rolled piece data by using a strip detector. The strip-shaped detector is an upper detection piece 3, an OS side detection piece 4 and a DS side detection piece 5, the upper detection piece 3 detects the value of the deviation of the horizontal center line of the rolled piece, and the OS side detection piece 4 and the DS side detection piece 5 detect the value of the deviation of the horizontal center line of the head of the rolled piece.
And step two, judging whether the specification data of the rolled piece measured by the strip detector meets the steel clamping prejudgment condition. The steel clamping prejudgment conditions are as follows:
wherein k isi-1Offset of the rolled piece head from the horizontal center line, biIs the width of the guide at the inlet side of the i-th rolling mill (see figure 3), hi-1The width of the outlet rolled piece of the i-1 rolling mill.
When the offset k of the head of the rolled piece isi-1When the formula is satisfied, the steel can not be clamped. Through the calculation of the formula, whether the steel clamping occurs or not is judged effectively before the rolled piece enters the rolling mill, and when the steel clamping occurs in the judgment, the machine can be stopped in time, so that the machine damage caused by the steel clamping is avoided, and the high-efficiency and stable production is ensured.
And step three, if the pre-judgment condition is met, the roll gap value is stored, and if the pre-judgment condition is not met, the size relation between the finished product flange width B and the finished product height H is judged. The finished product flange width B and the finished product height H are finished product size values and can be measured. And (4) carrying out different adjustments on the previous rolling mill according to the relation between the finished product flange width B and the finished product height H, and if B is more than or equal to 1.5H, adjusting the roll gap value of the vertical rolling mill in the subsequent steps. And if B is less than 1.5H, adjusting the roll gap value of the flat rolling mill in the subsequent step.
And step four, judging the deviation position of the head of the rolled piece according to the data measured by the strip detector. And if the head of the rolled piece is judged to bend to the DS side, increasing the roll gap value of the OS side of the previous rolling mill or reducing the roll gap value of the DS side in the step five. And if the head of the rolled piece is bent to the OS side, increasing the DS side roll gap value of the previous rolling mill or reducing the OS side roll gap value.
And step five, adjusting and storing the roll gap value of the previous rolling mill according to the size relation between the flange width B of the finished product obtained in the step three and the height H of the finished product and the deviation position of the head of the rolled piece obtained in the step four. And the step adjusts the roll gap value of the previous rolling mill according to the step three and the step four, and when B is larger than or equal to 1.5H, the roll gap adjustment value of the opposite rolling mill is adjusted by 1.0-2.0mm each time. When B is less than 1.5H, the roll gap adjustment value of the flat rolling mill is 0.5-1.0mm each time. The adjustment range is set, so that the roll gap value can be quickly adjusted to enable a rolled piece to meet the steel clamping prejudgment condition, and the problems that the adjustment is excessive and needs to be repeated in the adjustment process can be solved. Specifically, in the embodiment, when B is larger than or equal to 1.5H, the adjustment value of the roll gap of the counter rolling mill is adjusted to be 1.5mm each time. When B is less than 1.5H, the roll gap adjustment value of the flat rolling mill is 1.0mm each time.
And step six, rolling the rolled piece by using the stored roll gap value, and repeating the steps one to five until the rolled piece meets the steel clamping prejudgment condition. The roll gap value meeting the steel clamping prejudgment condition is stored and can be directly called when rolled pieces with the same specification are rolled, so that the time for readjustment is saved, and the productivity of the rolled pieces is improved.
By adopting the method of the embodiment, the roll gap parameter of a finishing mill group of a certain domestic small H-shaped steel production line is optimized, when small hot-rolled H-shaped steel of each specification is produced by adopting the optimized roll gap parameter, the strip detection of a rolled piece realizes automatic detection and automatic correction, the product quality is effectively improved, and the steel blocking occurrence rate is reduced by 70%.
Example 2
Hot rolling for rolling H250X 125X 6X 9 beamsExamples of H-section steels. Before entering each finishing mill, the detection part 3 on the detection system displays that the plane profile of the rolled piece is good, the detection and calculation results of the OS side detection part 4 and the DS side detection part 5 display that before entering each finishing mill, the offsets of the head of the rolled piece are respectively 12mm, 11mm, 24mm, 13mm, 15mm and 18mm, which are all smaller than the width b of the guide inlet of the corresponding milliAnd the steel bar piece is met.
And the rolling mill secondary system stores the roll gap value of each rolling mill roll during rolling of the rolled piece, and calls the stored value to the production of the subsequent 4250t of products with the specification. The whole production process is smooth, and the incidence of steel blocking is 0.
Example 3
Examples of hot rolled H-section steel for H200X 8X 12 piles. Before a first rolled piece enters each frame of finishing mill, a detection device of the detection system is started, when the rolled piece passes through 1-3 frames of rolling mills, the plane profile of the rolled piece is good, the detection results of the offset are respectively 27mm, 16mm and 20mm, and the detection results are smaller than the width b of a guide inlet of the corresponding rolling milliAnd the steel bar piece is met. When the rolled piece passes through the 4 th frame finishing mill, the upper detection device displays that the head of the rolled piece is obviously bent towards the DS, the offset of the head of the rolled piece measured by the DS side detection device is 65mm, and the detection device sends out a steel blocking alarm to indicate that the rolled piece is blocked when entering the 5 th frame finishing mill, so that the rolling process is stopped. Aiming at the phenomenon, the roll gap of a DS side vertical rod of a 4 th rolling mill is reduced by 1mm, the data is stored, when the next rolled piece is rolled, the stored numerical value is called, the detection results of the head offset of the rolled piece before entering each rolling mill are respectively 28mm, 22mm, 14mm, 10mm, 23mm and 17mm, the rolled piece has good strip shape, and the requirement of passing through a steel strip piece is met.
And the rolling mill secondary system stores the roll gap value of each rolling mill roll during rolling of the rolled piece, and calls the stored value to the production of the subsequent residual 5620t products with the specification. The whole production process is smooth, and the incidence of steel blocking is 0.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. A method for preventing a small hot-rolled H-shaped steel finishing mill group from jamming is characterized by comprising the following steps:
step one, detecting rolled piece data by using a strip detector;
judging whether the specification data of the rolled piece measured by the strip detector meets a steel clamping prejudgment condition;
step three, if the pre-judging condition is met, the roll gap value of the previous rolling mill is stored, and if the pre-judging condition is not met, the size relation between the finished product flange width B and the finished product height H is judged;
judging the head deviation position of the current rolling mill inlet rolled piece according to the data measured by the strip detector;
step five, adjusting and storing the roll gap value of the previous rolling mill according to the size relation between the flange width B of the finished product obtained in the step three and the height H of the finished product and the deviation position of the head of the rolled piece obtained in the step four;
and step six, rolling the rolled piece by using the stored roll gap value, and repeating the steps one to five until the rolled piece meets the steel clamping prejudgment condition.
2. The method for preventing the small hot-rolled H-shaped steel finishing mill group from jamming of steel according to claim 1, wherein: in the first step, the bar detector comprises an upper detection piece (3), an OS side detection piece (4) and a DS side detection piece (5), the upper detection piece (3) is a plane profile scanner, and the OS side detection piece (4) and the DS side detection piece (5) are distance detectors.
3. The method for preventing the small hot-rolled H-shaped steel finishing mill group from jamming of steel according to claim 2, wherein: in the first step, the data measured by the upper detection part (3) is the offset of the rolled piece from the central line in the horizontal rolling direction, and the OS side detection part (4) and the DS side detection part (5) detect the offset of the head of the rolled piece from the central line in the horizontal rolling direction.
4. A method for preventing a small hot rolled H-section steel finishing mill train from jamming according to any one of claims 1 to 3, wherein: the pre-judging condition of the steel clamping in the second step is
Wherein k isi-1Detecting the offset of the head of the rolled piece from the horizontal center line for the OS-side detecting member (4) and the DS-side detecting member (5), biThe width of the guide at the inlet side of the i-th rolling mill, hi-1The width of the outlet rolled piece of the i-1 rolling mill.
5. The method for preventing the small hot-rolled H-shaped steel finishing mill group from jamming of steel according to claim 4, wherein: judging the size relationship between the flange width B of the finished product and the height H of the finished product in the third step, and if B is more than or equal to 1.5H, adjusting the roll gap value of the previous vertical rolling mill in the subsequent step; and if B is less than 1.5H, the subsequent step adjusts the roll gap value of the previous flat rolling mill.
6. The method for preventing the small hot-rolled H-shaped steel finishing mill group from jamming of steel according to claim 5, wherein: in the fourth step, if the head of the rolled piece is judged to bend to the DS side, the roll gap value of the OS side of the previous rolling mill is increased or the roll gap value of the DS side is reduced in the subsequent step; and if the head of the rolled piece is bent to the OS side, increasing the DS side roll gap value of the previous rolling mill or reducing the OS side roll gap value.
7. The method for preventing the small hot-rolled H-shaped steel finishing mill group from jamming of steel according to claim 6, wherein: in the fifth step, when B is more than or equal to 1.5H, the roll gap of the vertical rolling mill is adjusted by 1.0-2.0mm each time; when B is less than 1.5H, the roll gap of the flat rolling mill is adjusted by 0.5-1.0mm each time.
8. The method for preventing the small hot-rolled H-section finishing mill from jamming of steel according to claim 7, wherein: the upper detection piece (3) collects the data of the rolled piece, and an image is drawn according to the data, so that the data is compared with the central line in the rolling direction, and the offset is calculated.
9. The method for preventing the small hot-rolled H-section finishing mill from jamming of steel according to claim 8, wherein: the OS side detection piece (4) and the DS side detection piece (5) respectively detect the value of the head distance detection piece of the rolled piece, and the values measured by the OS side detection piece (4) and the DS side detection piece (5) are subtracted and divided by 2 to obtain the offset of the head of the rolled piece from the central line in the horizontal direction.
10. The method for preventing the small hot-rolled H-section finishing mill from jamming of steel according to claim 9, wherein: the upper detection piece (3), the OS side detection piece (4) and the DS side detection piece (5) are arranged between two adjacent finishing mills, and the OS side detection piece (4) and the DS side detection piece (5) are also arranged at the inlet of the first finishing mill.
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| JP5979066B2 (en) * | 2012-06-04 | 2016-08-24 | Ｊｆｅスチール株式会社 | Result prediction apparatus and result prediction method |
| CN106694566B (en) * | 2015-07-21 | 2018-12-04 | 宝山钢铁股份有限公司 | The edging control method of vertical miller steel-fastening |
| CN106475424B (en) * | 2015-08-25 | 2018-10-02 | 宝山钢铁股份有限公司 | A kind of control method of Hot Rolling Strip sideslip |
| CN108655185B (en) * | 2017-03-30 | 2021-06-15 | 宝山钢铁股份有限公司 | Method for preventing steel jamming of single-stand rolling mill |
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