CN114618893A - Operation method for quickly diagnosing and controlling scratch defects of hot-rolled strip steel - Google Patents
Operation method for quickly diagnosing and controlling scratch defects of hot-rolled strip steel Download PDFInfo
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- CN114618893A CN114618893A CN202210355130.1A CN202210355130A CN114618893A CN 114618893 A CN114618893 A CN 114618893A CN 202210355130 A CN202210355130 A CN 202210355130A CN 114618893 A CN114618893 A CN 114618893A
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/42—Control of flatness or profile during rolling of strip, sheets or plates using a combination of roll bending and axial shifting of the rolls
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Abstract
The invention discloses an operation method for quickly diagnosing and controlling scratch defects of hot-rolled strip steel, which comprises the following steps of: the method comprises the following steps of (1) discriminating and classifying scratches of the hot-rolled strip steel, and discriminating a first type of scratches from a second type of scratches according to the color and the depth of the scratches; aiming at the first type of scratches, a rolling line is improved, and the horizontal elevation of the outlet of a rolled piece is improved, so that the rolled piece is not in contact with a non-rolling part; the unilateral and roll bending force is adjusted, so that the plate shape straightness is changed; polishing the outlet guide bottom plate; the matching precision of a connecting pin shaft of an outlet guide in-and-out action mechanism is improved, the matching precision control of the copper sleeve connection of the pin shaft is improved from original smaller than 1.0mm to smaller than 0.5mm, and a glycerol lubricating point is additionally arranged at the matching position of the connecting shaft; aiming at the second type of scratch, optimizing the sequence of the idle passing through the machine frame according to the guide and guard abrasion condition; the angle of the loop of the idle rolling mill is increased by additionally arranging the cushion block, the angle is 10.8 degrees, and the height elevation of the loop raising roller of the idle loop is increased, so that a rolled piece of the idle rolling mill is in rolling contact with the loop roller.
Description
Technical Field
The invention belongs to the technical field of hot rolled strip steel production lines, and particularly relates to an operation method for quickly diagnosing and controlling scratch defects of hot rolled strip steel.
Background
At present, the quality defect of scratch of the lower surface of the strip steel often appears in a hot-rolled strip steel production line, so that quality halt is caused, defective products are generated, and the production rhythm and the product quality of the hot-rolled strip steel production line are seriously influenced.
The method for treating the surface scratch defects is to grind the bottom plate of a process channel or the surface of a roller way, improve the smoothness, reduce the friction coefficient of the contact surface of the process channel and the lower surface of strip steel as much as possible and reduce or eliminate the scratches of the lower surface of a rolled piece. The method has a certain effect on eliminating the scratch defect, but has poor effect on pickling or deep drawing steel with soft materials, still generates the scratch defect, and the traditional treatment method can not completely solve the scratch problem of the hot-rolled strip steel.
Disclosure of Invention
The invention aims to provide an operation method for quickly diagnosing and controlling scratch defects of hot-rolled strip steel.
The technical scheme adopted by the invention for solving the technical problems is as follows: an operation method for quickly diagnosing and controlling scratch defects of hot-rolled strip steel comprises the following steps:
1) the method comprises the following steps of (1) discriminating and classifying scratches of the hot-rolled strip steel, and discriminating a first type of scratches from a second type of scratches according to the color and the depth of the scratches;
2) aiming at the first type of scratches, a rolling line is improved, and the horizontal elevation of a rolled piece outlet is improved, so that the rolled piece is not in contact with a non-rolling part; the unilateral and roll bending force is adjusted, so that the plate shape straightness is changed; polishing the outlet guide bottom plate to remove uneven parts; the matching precision of a connecting pin shaft of an outlet guide in-and-out action mechanism is improved, the matching precision control of the copper sleeve connection of the pin shaft is improved from original smaller than 1.0mm to smaller than 0.5mm, and a glycerol lubricating point is additionally arranged at the matching position of the connecting shaft;
3) aiming at the second type of scratch, optimizing the sequence of the idle passing through the machine frame according to the guide and guard abrasion condition; the angle of the loop of the idle rolling mill is increased by additionally arranging the cushion block, the angle is 10.8 degrees, and the height elevation of the loop raising roller of the idle loop is increased, so that a rolled piece of the idle rolling mill is in rolling contact with the loop roller.
Specifically, the first type of scratch comprises a scratch caused by a layer cooling roller way and a scratch caused by a finish rolling outlet guide.
The invention has the beneficial effects that: the operation method can fundamentally solve the scratch problem in the production process of the hot-rolled strip steel, thereby greatly improving the production rhythm of hot rolling and the surface quality level of hot-rolled products and realizing high quality and high efficiency of a hot-rolled strip steel production line.
Drawings
FIG. 1 is a schematic diagram (I) of the structure of the glycerol lubrication point of the connecting shaft.
FIG. 2 is a schematic diagram of the structure of the glycerol lubrication point of the connecting shaft (II).
FIG. 3 is a schematic diagram (III) of the structure of the glycerol lubrication point of the connecting shaft.
Fig. 4 is a schematic structural diagram (one) of the cushion block.
Fig. 5 is a schematic structural diagram (ii) of the spacer.
In the figure: 1-glycerol lubrication point; 2-cushion block; and 3, a handle.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 5, an operating method for rapidly diagnosing and controlling scratch defects of a hot rolled strip steel includes the steps of:
1) and (3) rapidly diagnosing a scratch source according to scratch characteristics:
the scratch is firstly discriminated and classified, and is mainly discriminated by the color and the depth of the scratch. One type of shiny, deep scratch is mainly focused on thin gauge products. There are two main reasons: firstly, the layer cooling roller way does not rotate or the roller way is scratched due to failure; secondly, the guide and guard bottom plate at the outlet of the F7 is scratched, and particularly, the scratch is more easily caused by the wavy shape before the thin head with the thickness of less than 3.0mm enters the coiling machine for tension building; the other type is scratch of thick products (the thickness is more than 10 mm), which is mainly caused by that the height elevation of a loop after the loop passes through a rolling mill is reduced due to the fact that the thick products need to pass through the rolling mill, and friction is generated between strip steel and a guide bottom plate.
2) According to different scratch characteristics, a targeted rectification method is adopted:
aiming at the scratch caused by the first-class layer cold roller bed, the daily product spot inspection is mainly enhanced, and the layer cold roller bed is quickly inspected and repaired; aiming at the scratch caused by the finish rolling F7 outlet guide, firstly, the elevation of a rolling line is artificially increased by 5mm by a method of virtually reducing the roll diameter of a supporting roll, the horizontal elevation of the outlet of a rolled piece is increased, and the scratch caused by the contact of the rolled piece and a non-rolling part is avoided or reduced; secondly, the plate shape is improved, the flatness of the plate shape is rapidly improved by adjusting the single side, the roll bending force and the like, and the intermittent scratch caused by poor plate shape is avoided; thirdly, polishing the F7 outlet guide bottom plate to remove uneven parts such as adhered impurities; fourthly, the matching precision of a connecting pin shaft of the F7 outlet guide in-and-out action mechanism is improved, the matching precision control of the copper sleeve connection of the pin shaft is improved to be less than 0.5mm from the original value of less than 1.0mm, meanwhile, in order to reduce abrasion, a connecting shaft structure is redesigned, as shown in figures 1-3, a glycerol lubricating point 1 is additionally arranged at the matching position of the connecting shaft, and the position precision of the F7 guide after entering a working position is greatly improved.
For the scratch improvement measures of the second type of thick specification, firstly, the sequence of idle passing racks is optimized according to the condition of checking guide and guard wear, and the original F3 and F5 are changed into F2 and F4; as shown in fig. 4-5, the angle of the loop of the idle rolling mill is increased by a mechanical mode of additionally installing a cushion block 2 with a proper size from original 9 degrees to 10.8 degrees, so that the height elevation of the loop-rising roller of the idle loop is increased, the rolled piece of the idle rolling mill is ensured to be in contact with the loop roller in a rolling mode instead of being in direct friction with the guide base plate, and the scratch problem is avoided.
The present invention is not limited to the above embodiments, and any structural changes made by the teaching of the present invention can be made within the scope of the present invention, and all technical solutions similar or identical to the present invention are within the scope of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (2)
1. An operation method for quickly diagnosing and controlling scratch defects of hot-rolled strip steel is characterized by comprising the following steps:
1) the method comprises the following steps of (1) discriminating and classifying scratches of the hot-rolled strip steel, and discriminating a first type of scratches from a second type of scratches according to the color and the depth of the scratches;
2) aiming at the first type of scratches, a rolling line is improved, and the horizontal elevation of the outlet of a rolled piece is improved, so that the rolled piece is not in contact with a non-rolling part; the unilateral and roll bending force is adjusted, so that the plate shape straightness is changed; polishing the outlet guide bottom plate to remove uneven parts; the matching precision of a connecting pin shaft of an outlet guide in-and-out action mechanism is improved, the matching precision control of the copper sleeve connection of the pin shaft is improved from original smaller than 1.0mm to smaller than 0.5mm, and a glycerol lubricating point is additionally arranged at the matching position of the connecting shaft;
3) aiming at the second type of scratch, optimizing the sequence of the idle passing through the machine frame according to the guide and guard abrasion condition; the angle of the loop of the idle rolling mill is increased by additionally arranging the cushion block, the angle is 10.8 degrees, and the height elevation of the loop raising roller of the idle loop is increased, so that a rolled piece of the idle rolling mill is in rolling contact with the loop roller.
2. The operating method for rapidly diagnosing and controlling the scratch defects of the hot-rolled strip steel according to claim 1, wherein the first type of scratches comprise scratches caused by a layer cooling roller way and scratches caused by a finishing rolling outlet guide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210355130.1A CN114618893B (en) | 2022-04-06 | 2022-04-06 | Operation method for rapidly diagnosing and controlling scratch defects of hot-rolled strip steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210355130.1A CN114618893B (en) | 2022-04-06 | 2022-04-06 | Operation method for rapidly diagnosing and controlling scratch defects of hot-rolled strip steel |
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| CN114618893A true CN114618893A (en) | 2022-06-14 |
| CN114618893B CN114618893B (en) | 2023-09-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0560701A (en) * | 1991-08-30 | 1993-03-12 | Kobe Steel Ltd | Method and device for flaw-eliminating rolling of line material |
| CN111974815A (en) * | 2019-05-22 | 2020-11-24 | 宝山钢铁股份有限公司 | Device and method for judging state of looping roller for preventing strip steel from being scratched |
| CN112570466A (en) * | 2019-09-30 | 2021-03-30 | 宝山钢铁股份有限公司 | Control method for solving scratch of high-surface thin-specification strip steel conveying roller way |
| CN113196040A (en) * | 2018-11-30 | 2021-07-30 | 杰富意钢铁株式会社 | Surface defect detection method, surface defect detection device, steel product manufacturing method, steel product quality management method, steel product manufacturing facility, surface defect determination model generation method, and surface defect determination model |
| CN113578977A (en) * | 2021-07-21 | 2021-11-02 | 张家港扬子江冷轧板有限公司 | Method for eliminating press-in defect of high-strength automobile steel point-like foreign matter |
-
2022
- 2022-04-06 CN CN202210355130.1A patent/CN114618893B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0560701A (en) * | 1991-08-30 | 1993-03-12 | Kobe Steel Ltd | Method and device for flaw-eliminating rolling of line material |
| CN113196040A (en) * | 2018-11-30 | 2021-07-30 | 杰富意钢铁株式会社 | Surface defect detection method, surface defect detection device, steel product manufacturing method, steel product quality management method, steel product manufacturing facility, surface defect determination model generation method, and surface defect determination model |
| CN111974815A (en) * | 2019-05-22 | 2020-11-24 | 宝山钢铁股份有限公司 | Device and method for judging state of looping roller for preventing strip steel from being scratched |
| CN112570466A (en) * | 2019-09-30 | 2021-03-30 | 宝山钢铁股份有限公司 | Control method for solving scratch of high-surface thin-specification strip steel conveying roller way |
| CN113578977A (en) * | 2021-07-21 | 2021-11-02 | 张家港扬子江冷轧板有限公司 | Method for eliminating press-in defect of high-strength automobile steel point-like foreign matter |
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| CN114618893B (en) | 2023-09-19 |
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