CN110014044B - Lining plate of high-pressure descaling box - Google Patents
Lining plate of high-pressure descaling box Download PDFInfo
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- CN110014044B CN110014044B CN201810017379.5A CN201810017379A CN110014044B CN 110014044 B CN110014044 B CN 110014044B CN 201810017379 A CN201810017379 A CN 201810017379A CN 110014044 B CN110014044 B CN 110014044B
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- descaling box
- chamfer transition
- high pressure
- pressure descaling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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Abstract
The invention discloses a high-pressure descaling box lining plate, which is characterized in that the shape of the inner side surface of the lining plate is designed in a segmented manner, and two corresponding chamfer transition areas are arranged, so that the damage caused by the friction between the edges and corners of a plate blank and the lining plate can be effectively avoided, the edge quality of hot-rolled strip steel is improved, and the competitiveness of hot-rolled products is improved.
Description
Technical Field
The invention relates to a repair technology of a pipe, in particular to a lining plate of a high-pressure descaling box.
Background
Referring to fig. 1, the hot rolling line process flow roughly includes five steps of a heating furnace 1, rough rolling 2, finish rolling 3, layer cooling 4, coiling 5, and the like. The process flow of the rough rolling area is as follows: the continuous casting slab with the thickness of 210-250 mm is heated to about 1200 ℃ by a hot rolling heating furnace, is descaled by a No. 1 high-pressure water descaling box 6, enters a first rough rolling rack 7a for rolling for one pass, is then rolled for five passes by a second rough rolling rack 7b, is finally rolled into an intermediate slab with the thickness of 36-65mm by a third rough rolling rack 7c and a fourth rough rolling rack 7d for one pass respectively, and is finished according to different width target values of the strip steel finished product.
Referring to fig. 2, a # 1 high pressure descaling box is used to remove scales attached to the upper and lower surfaces of the hot slab. The descaling box position is arranged on the descaling roller way 11, and lining plates 12 are arranged on two sides of the interior of the descaling box position. The descaling box cover 13 can be opened for internal inspection. The high-pressure descaling box comprises two pairs of descaling collecting pipes, and each pair of collecting pipes can spray high-pressure water independently or simultaneously. To minimize the water rushing out of the descaling cells and to prevent interference between the two pairs of headers, the descaling cells are provided with water retaining means 15 at the inlet and outlet of the descaling cells.
Referring to fig. 3, in the actual production process of hot rolling, it is found that edge scratches are sometimes present on the edges of the strip steel, and the edge scratches are mainly distributed on the two side edges of the strip steel by 20-60 mm, and have different degrees, which affect the quality and competitiveness of the hot rolled product.
For this reason, after a plurality of defect verification tests, the surfaces of the lining plates in the descaling box were inspected and measured by opening the descaling box a plurality of times, and it was found that the wear of the areas where the lining plates and the corner portions of the upper and lower surfaces of the slab 16 were in contact was the most severe. The defects are generated in the subsequent rolling process due to the fact that the slab is drawn out of the heating furnace, and the corner parts of the slab are damaged due to uneven friction between the corner parts of the upper surface and the lower surface of the slab and the inner lining plate when the corner parts of the slab pass through the descaling box due to inaccurate steel drawing position precision or deviation of a slab conveying roller way.
Disclosure of Invention
The invention aims to overcome the defects and provide the lining plate of the high-pressure descaling box, which can effectively avoid the quality defect of the edge of the strip steel caused by the damage of the edges and corners of the plate blank.
In order to achieve the above object, the present invention adopts the following technical solutions.
The utility model provides a bushing plate in high pressure descaling box, bushing plate medial surface design is for last chamfer transition zone between the upper and middle and lower section planes and the lower chamfer transition zone between the middle and lower section planes of upper, middle and lower three-section plane and upper and middle section planes, wherein, the median plane height A, radius R1 of lower chamfer transition zone, the radius R2's of last chamfer transition zone formula are respectively:
wherein A is the height of the middle section plane, and the unit is mm;
ti is the thickness of different slabs cast in the continuous casting process;
ni is the number of blocks corresponding to slabs with different thicknesses cast in the continuous casting process;
K0the thickness empirical coefficient of the heated plate blank;
in the formula XjThe measured value of the abrasion loss of the lower machine lining plate of the lower chamfer transition area is obtained;
Mjmeasuring the number of worn liner plates of the lower machine;
K1the empirical coefficient of the lower chamfer transition zone;
in the formula YjThe measured value of the abrasion loss of the lower machine lining plate of the upper chamfer transition area is obtained;
Mjmeasuring the number of worn liner plates of the lower machine;
K2is an empirical factor of the upper chamfer transition zone.
The starting position of the lower end of the middle section plane height A is obtained by increasing the height A 'from the reference relative position of the surface of the roller way in the descaling box, and the value range of A' is 5-20 mm.
The value range of n is 1-6.
Said K0The value range of (A) is 1.03-1.10.
The value range of m is 10-20.
Said K1The value range of (A) is 1.07-1.17.
Said K2The value range of (A) is 1.03-1.13.
In the technical scheme of the invention, the inner side surface shape of the inner lining plate is designed in a segmented manner, and the corresponding two chamfer transition areas are arranged, so that the damage caused by friction between the plate blank corners and the inner lining plate can be effectively avoided, the edge quality of the hot-rolled strip steel is improved, and the competitiveness of a hot-rolled product is improved.
Drawings
FIG. 1 is a schematic view of a furnace-to-roughing configuration of a hot rolling line;
FIG. 2 is a schematic view showing a structure of a conventional high-pressure descaling box;
fig. 3 is a schematic view of the structure of the lining plate of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The high-pressure descaling box lining plate of the invention is shown in figure 3, which is symmetrically arranged at two sides of a descaling roller way, and the total height and the thickness of each lining plate are not different from those of the prior conventional lining plate. The difference lies in that the medial surface is designed into upper chamfer transition zone between upper and middle section planes and lower chamfer transition zone between upper and middle section planes, wherein, the calculation formulas of middle section plane height A, radius R1 of lower chamfer transition zone, radius R2 of upper chamfer transition zone are respectively:
1. corresponding to different hot rolling production lines, the height A of the middle section plane of the lining plate of the hot rolling high-pressure descaling box can be determined according to the formula 1 by corresponding to different thickness group moments of a cast plate blank of an upstream continuous casting process;
wherein A is the mid-section plane height (unit: mm);
ti-the thickness of different slabs cast in the continuous casting process (n is usually within 6);
ni-the number of blocks corresponding to slabs with different thicknesses cast in the continuous casting process;
K0-the empirical thickness coefficient (value range 1.03-1.10) after heating the slab;
2. designing the lower chamfer transition area of the lining plate of the hot rolling high-pressure descaling box, and determining the chamfer radius R1According to the wear degree measured value X of the lining plate of the lower machinejThe average value gives:
Xj-a lower machine liner wear measurement value (m is usually within 10-20) at the lower chamfer position;
Mj-measuring the number of worn liner plates of the lower machine;
K1the empirical coefficient of the lower chamfer part (the value range is 1.07-1.17);
3. the design of the chamfer transition area on the lining plate of the hot rolling high-pressure descaling box can also determine the chamfer radius R by measuring the abrasion degree of the lining plate of the lower mill2：
YjThe measured value of the abrasion loss of the lower machine lining plate at the upper chamfer part (m is usually within 10-20);
Mj-measuring the number of worn liner plates of the lower machine;
K2-an upper chamfer part empirical coefficient (value range 1.03-1.13);
4. the design of the lower end initial position of the middle section plane of the descaling box can be obtained by increasing the height A 'from the reference relative position of the surface of the roller way in the descaling box, and the value range of the A' is 5-20 mm.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (7)
1. The utility model provides a bushing plate in high pressure descaling box which characterized in that, bushing plate medial surface design is for last, well, lower three-section plane and last chamfer transition zone between the upper and lower mid-section plane and the lower chamfer transition zone between the well, lower section plane, and wherein, mid-section plane height A, radius R1 of lower chamfer transition zone, the radius R2's of going up the chamfer transition zone computational formula do respectively:
wherein A is the height of the middle section plane, and the unit is mm;
ti is the thickness of different slabs cast in the continuous casting process;
ni is the number of blocks corresponding to slabs with different thicknesses cast in the continuous casting process;
K0the thickness empirical coefficient of the heated plate blank;
in the formula XjThe measured value of the abrasion loss of the lower machine lining plate of the lower chamfer transition area is obtained;
Mjmeasuring the number of worn liner plates of the lower machine;
K1the empirical coefficient of the lower chamfer transition zone;
in the formula YjThe measured value of the abrasion loss of the lower machine lining plate of the upper chamfer transition area is obtained;
Mjmeasuring the number of worn liner plates of the lower machine;
K2is an empirical factor of the upper chamfer transition zone.
2. The high pressure descaling box liner of claim 1, wherein: the starting position of the lower end of the middle section plane height A is obtained by increasing the height A 'from the reference relative position of the surface of the roller way in the descaling box, and the value range of A' is 5-20 mm.
3. The high pressure descaling box liner of claim 1, wherein: the value range of n is 1-6.
4. The high pressure descaling box liner of claim 1, wherein: said K0The value range of (A) is 1.03-1.10.
5. The high pressure descaling box liner of claim 1, wherein: the value range of m is 10-20.
6. The high pressure descaling box liner of claim 1, wherein: said K1The value range of (A) is 1.07-1.17.
7. The high pressure descaling box liner of claim 1, wherein: said K2The value range of (A) is 1.03-1.13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810017379.5A CN110014044B (en) | 2018-01-09 | 2018-01-09 | Lining plate of high-pressure descaling box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810017379.5A CN110014044B (en) | 2018-01-09 | 2018-01-09 | Lining plate of high-pressure descaling box |
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| CN110014044A CN110014044A (en) | 2019-07-16 |
| CN110014044B true CN110014044B (en) | 2020-07-28 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08290221A (en) * | 1995-04-18 | 1996-11-05 | Nippon Kokan Light Steel Kk | Opening device for linear plate |
| CN201543650U (en) * | 2009-10-20 | 2010-08-11 | 宝山钢铁股份有限公司 | Vertical roll with surface curve being quartic equation |
| CN202377264U (en) * | 2011-11-11 | 2012-08-15 | 酒泉钢铁(集团)有限责任公司 | Vertical roller hole pattern for eliminating streaky peeling defect of edge part of stainless steel hot-rolled strip steel |
| CN102699028B (en) * | 2012-02-24 | 2015-03-04 | 宝山钢铁股份有限公司 | Method for eliminating linear edge defects of hot-rolled low-carbon steel |
| CN204486488U (en) * | 2014-11-28 | 2015-07-22 | 宝山钢铁股份有限公司 | A kind of effective high pressure descaling case baffle device for water improving steel edge portion quality |
| CN204503789U (en) * | 2015-04-03 | 2015-07-29 | 唐山不锈钢有限责任公司 | A kind of finishing mill outlet transition guide plate |
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