CN108906893B - Rolling method for improving success rate of aluminothermic finish rolling threading - Google Patents
Rolling method for improving success rate of aluminothermic finish rolling threading Download PDFInfo
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- CN108906893B CN108906893B CN201810875785.5A CN201810875785A CN108906893B CN 108906893 B CN108906893 B CN 108906893B CN 201810875785 A CN201810875785 A CN 201810875785A CN 108906893 B CN108906893 B CN 108906893B
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Abstract
The invention relates to a rolling method for improving the success rate of aluminothermic finish rolling threading, which comprises the following steps: 1) when the intermediate plate blank is rolled in the last pass of hot rough rolling, the head of the intermediate plate blank is further thinned on the basis of the preset rolling thickness, namely before the last pass of hot rough rolling, the target stroke of the oil cylinder is additionally provided with an additional set value on the basis of the original set value so as to reduce the thickness of a rolling outlet; 2) when the material is bitten in the last pass of the hot rough rolling, calculating the length of an outlet of the intermediate plate blank at the current speed, and simultaneously reducing an additional set value of the oil cylinder according to a slope; 3) after the length of the outlet of the intermediate slab is calculated to reach the target length, rolling is performed according to the rolling reduction preset in the current pass. The method is convenient to operate and is beneficial to improving the success rate of aluminothermic finish rolling threading.
Description
Technical Field
The invention relates to a rolling method for improving the success rate of aluminothermic finish rolling threading.
Background
The 1+3 aluminothermic continuous rolling unit consists of 1 single-stand reversible rough rolling mill and 3-stand irreversible finish rolling mill, the main technological process is that an aluminum plate ingot (with the typical size of 600mmx thickness, 1800mmx width and 1800mmx length of 7000mm) is heated by a heating furnace, the aluminum plate ingot is conveyed to a hot rolling roller bed by a heating furnace upender, then the aluminum plate ingot is rolled back and forth by the single-stand hot rough rolling mill to form an intermediate plate blank (with the thickness of 22.5 mm), the end and the tail are cut by heavy shearing and light shearing, the intermediate plate blank is continuously rolled by the 3-stand finish rolling mill and is coiled by a coiling machine, and the finished product is an aluminothermic rolled. The reduction of the hot rolled coil can effectively reduce the processing pass and the processing cost of the post-process, but the 3-stand finish rolling is limited by the number of stands and the load to be passed is limited, so that the thickness of the intermediate billet at the finish rolling inlet is generally required to be as thin as possible for the same finished product thickness. Because the hot rolling input roller way is a tapered roller, two sides of the intermediate slab contact the roller way in the conveying process, if the intermediate slab is too thin, the problem of waist collapse exists, namely, the intermediate slab bends and deforms downwards on the transverse surface, so that the part inside the end part of the intermediate slab contacts the roller way, the lower surface of the slab is scratched, and the product quality is influenced. The problem that the strip threading and the material biting are difficult to realize in the process of rolling the alloy with large rolling reduction through hot finish rolling is always solved, the thickness of the intermediate plate blank is limited, the load of a 3-stand finishing mill is further increased when a thinner material is required to be rolled, and the problem that the strip threading and the material biting are difficult to realize at the head part is more prominent under the condition of large-load rolling, namely the failure rate of the strip threading of a 3-stand finishing mill group is improved under the large rolling reduction. After the primary tape threading fails, the steel strip can only be rolled into a thicker finished product, which not only affects the production efficiency, but also increases the processing pass and the processing cost of the downstream procedure.
Disclosure of Invention
The invention aims to provide a rolling method for improving the success rate of aluminothermic finish rolling threading, which is convenient to operate and is beneficial to improving the success rate of aluminothermic finish rolling threading.
The technical scheme of the invention is as follows: a rolling method for improving the success rate of aluminothermic finish rolling threading comprises the following steps:
1) when the intermediate plate blank is rolled in the last pass of hot rough rolling, the head of the intermediate plate blank is further thinned on the basis of the preset rolling thickness, namely before the last pass of hot rough rolling, the target stroke of the oil cylinder is additionally provided with an additional set value on the basis of the original set value so as to reduce the thickness of a rolling outlet;
2) when the material is bitten in the last pass of the hot rough rolling, calculating the length of an outlet of the intermediate plate blank at the current speed, and simultaneously reducing an additional set value of the oil cylinder according to a slope;
3) after the length of the outlet of the intermediate slab is calculated to reach the target length, rolling is performed according to the rolling reduction preset in the current pass.
The length of the head section of the intermediate slab is 3 meters.
When the head section of the intermediate plate blank is rolled, the rough rolling reduction is 0.8mm more than the preset reduction of the pass.
The above-mentioned detection hot rough rollingThe strip temperature T1 after the reverse two-pass rolling, the thickness H of the rolled strip, the length L of the strip, the roll diameter D of a roll, the width B of the strip, the friction coefficient f in the rolling state of the roll, the target thickness H of the last pass and the rigidity E of the rolling mill are calculated to obtain the bounce H1 of the rolling mill; the actual roll gap is s = H-H1-0.8，
Wherein h1= P/k; p is rolling force; k is the rigidity coefficient of the rolling mill; p =1.15 σ QBL; k =1.15 σ; q is a pressure function, Q =1/2[ l/(H + H)/2 + (H + H)/2 l ]; l is the length of the strip, L = H × L/H;
so s = h-BH2L2/h2(H+h)-B（H+h）/4-0.8。
In the above-described rolling of the head section of the intermediate slab, after the bite, the rolling reduction is set to a slope, the rolling reduction is slowly adjusted to a preset rolling reduction, the calculation of the slope is based on the target outlet length, after the calculation of the target outlet length of the intermediate slab, the intermediate slab is rolled again according to the rolling reduction set in the present pass, and the longitudinal thickness of the head section of the intermediate slab is rolled into a wedge shape by this rolling method.
The length of the slope is L0If the thickness of the strip changes slowly, the gradient is kα=0.8/L0, and the actual roll gap is set at sx = s + kαvt, v is the rolling speed of the last pass, and t is the time required for rolling the section.
Compared with the prior art, the invention has the following advantages: the method of rolling the head of the intermediate billet to be thinner in the last pass of rough rolling is adopted to solve the problem of difficult material biting of finish rolling; greatly improves the threading failure rate caused by heavy load, reduces the proportion of the thickness of the rolling, and reduces the processing pass and the processing cost of the post procedure.
Drawings
FIG. 1 is a schematic diagram of the operation of the present invention;
fig. 2 is a schematic cross-sectional view of the head of the intermediate slab of the present invention;
fig. 3 is a schematic view of an actual roll gap curve of the head portion thinning of the intermediate slab of the present invention.
Detailed Description
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Refer to fig. 1 to 3
A rolling method for improving the success rate of aluminothermic finish rolling threading comprises the following steps:
1) when the intermediate plate blank is rolled in the last pass of hot rough rolling, the head of the intermediate plate blank is further thinned on the basis of the preset rolling thickness, namely before the last pass of hot rough rolling, the target stroke of the oil cylinder is additionally provided with an additional set value on the basis of the original set value so as to reduce the thickness of a rolling outlet;
2) when the material is bitten in the last pass of the hot rough rolling, calculating the length of an outlet of the intermediate plate blank at the current speed, and simultaneously reducing an additional set value of the oil cylinder according to a slope;
3) after the length of the outlet of the intermediate slab is calculated to reach the target length, rolling is performed according to the rolling reduction preset in the current pass.
When the head section of the intermediate plate blank is rolled, the rough rolling reduction is 0.8mm more than the preset reduction of the pass.
Detecting the temperature T1 of the strip after the hot rough rolling and the two-pass rolling, the thickness H of the strip after the rolling, the length L of the strip, the roll diameter D of a roll, the width B of the strip, the friction coefficient f in the rolling state of the roll, the target thickness H of the last pass and the rigidity E of the rolling mill, and calculating the bounce H1 of the rolling mill; the actual roll gap is s = H-H1-0.8，
Wherein h1= P/k; p is rolling force; k is the rigidity coefficient of the rolling mill; p =1.15 σ QBL; k =1.15 σ; q is a pressure function, Q =1/2[ l/(H + H)/2 + (H + H)/2 l ]; l is the length of the strip, L = H × L/H;
so s = h-BH2L2/h2(H+h)-B（H+h）/4-0.8。
In the above-described rolling of the head section of the intermediate slab, after the bite, the rolling reduction is set to a slope, the rolling reduction is slowly adjusted to a preset rolling reduction, the calculation of the slope is based on the target outlet length, after the calculation of the target outlet length of the intermediate slab, the intermediate slab is rolled again according to the rolling reduction set in the present pass, and the longitudinal thickness of the head section of the intermediate slab is rolled into a wedge shape by this rolling method.
The length of the slope is L0If the thickness of the strip changes slowly, the gradient is kα=0.8/L0, and the actual roll gap is set at sx = s + kαvt, v is the rolling speed of the last pass, and t is the time required for rolling the section.
For example, in a 5052 aluminum alloy in which the width of a rolled ingot is 1250mm, the thickness of the ingot is 650mm, and the length of the ingot is 5000mm, the hot rough rolling is performed in two passes, the thickness is 35mm, and the length is 85000 mm. The target rolling thickness is 25mm, the roller diameter D of the roller is 1050mm, the temperature after two-pass rolling is 450 ℃, and the friction coefficient f =0.46 in a rolling state;
when the intermediate plate blank is subjected to hot rough rolling in the last pass, the target stroke of the oil cylinder is increased by 0.8mm on the basis of the original set value so as to reduce the thickness of a rolling outlet;
when the material is bitten in the last pass of the hot rough rolling, calculating the length of an outlet of the intermediate plate blank at the current speed (taking 2.2m/s as an example), and simultaneously reducing an additional set value of the oil cylinder according to a slope;
the length of the outlet of the intermediate slab is calculated to reach the target length L0When the thickness is not less than 3m, the roll gap after thinning is s = h-BH2L2/h2(H + H) -B (H + H)/4-0.8 =24.127 mmm; the slope of the roll gap setting curve of the head thinning section is kα=0.8/3=0.26。
The roll gap curve is sx = s + kαvt =24.127+0.26 × 2.2 × t =24.127+0.572t, t being the rolling time. The cross-sectional view of the rolled head is shown in FIG. 2.
The key point of the invention is that the actual roll gap required by the rolling is calculated according to a set formula by collecting and calculating the rolling parameters. Ensuring the actual rolling thickness of 0.8 mm. If the rolling is too thin, the strip is thin, the temperature is reduced quickly, and the head is difficult to roll; if the rolling thickness is too small, the rolling reduction of the finish rolling bite is large, the finish rolling load is large, and the problem of the bite being difficult to occur is likely to occur.
It will be apparent to those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and it is not necessary to invent a rolling method for increasing the success rate of a hot finish rolling threading, which is designed in different forms according to the teachings of the present invention, and all the equivalent changes, modifications, substitutions and variations made in the invention according to the claims of the present invention should be covered by the present invention without departing from the principle and spirit of the invention.
Claims (1)
1. A rolling method for improving the success rate of aluminothermic finish rolling threading is characterized by comprising the following steps:
1) when the intermediate plate blank is rolled in the last pass of hot rough rolling, the head of the intermediate plate blank is further thinned on the basis of the preset rolling thickness, namely before the last pass of hot rough rolling, the target stroke of the oil cylinder is additionally provided with an additional set value on the basis of the original set value so as to reduce the thickness of a rolling outlet; the length of the head section of the intermediate plate blank is 3 meters;
2) when the material is bitten in the last pass of the hot rough rolling, calculating the length of an outlet of the intermediate plate blank at the current speed, and simultaneously reducing an additional set value of the oil cylinder according to a slope;
3) after the length of the outlet of the intermediate plate blank is calculated to reach the target length, rolling according to the preset rolling reduction of the pass; when the head section of the intermediate plate blank is rolled, the rough rolling reduction is 0.8mm more than the preset reduction of the pass; detecting the temperature T1 of the strip after the hot rough rolling and the two-pass rolling, the thickness H of the strip after the rolling, the length L of the strip, the diameter D of a roller, the width B of the strip, the friction coefficient f in the rolling state of the roller, the target thickness H of the last pass and the rigidity E of the rolling mill, and calculating the bounce H1 of the rolling mill; the actual roll gap is s = H-H1-0.8，
Wherein h1= P/k; p is rolling force; k is the rigidity coefficient of the rolling mill; p =1.15 σ QBL; k =1.15 σ; q is a pressure function, Q =1/2[ l/(H + H)/2 + (H + H)/2 l](ii) a L is the length of the strip, L = H × L/H; σ is the material yield strength of aluminum; so s = h-BH2L2/h2(H + H) -B (H + H)/4-0.8; when rolling the head section of the intermediate slab, after the bite, the rolling reduction is given according to the slope, and the rolling reduction is slowly adjustedSaving the preset rolling reduction, calculating the slope based on the target outlet length, rolling according to the rolling reduction set in the current pass after calculating the length of the outlet of the intermediate slab to reach the target length, and rolling the longitudinal thickness of the head of the intermediate slab into a wedge shape by the rolling method; the length of the slope is L0If the thickness of the strip changes slowly, the gradient is kα=0.8/L0, and the actual roll gap is set at sx = s + kαvt, v is the rolling speed of the last pass, and t is the time required for rolling the section.
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| CN112742874A (en) * | 2019-10-30 | 2021-05-04 | 宝山钢铁股份有限公司 | Method for using belt head flat head for controlling strip steel deviation of hot finishing mill group |
| CN113118211A (en) * | 2020-01-10 | 2021-07-16 | 晟通科技集团有限公司 | Finish rolling and rolling start method |
| CN111957751B (en) * | 2020-07-10 | 2022-04-08 | 北京科技大学设计研究院有限公司 | Method for controlling head and tail thinning wedge in reversible rolling process of steckel mill |
| CN113028407B (en) * | 2021-03-19 | 2022-12-23 | 宁德市福化环保科技有限公司 | Industrial incineration line feeding device |
| CN113500102B (en) * | 2021-07-07 | 2023-06-23 | 中铝瑞闽股份有限公司 | Rolling method for reducing deviation rolling leakage of aluminum hot finish rolling belt tail |
| CN115138678B (en) * | 2022-07-12 | 2024-08-30 | 河南中孚高精铝材有限公司 | Rapid rolling method and system of thermit continuous rolling roughing mill |
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| CN1850375A (en) * | 2006-04-29 | 2006-10-25 | 东北大学 | Method for continuously rolling variable-thickness steel plate |
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| CN101817023B (en) * | 2009-11-25 | 2011-10-05 | 河北钢铁股份有限公司 | Thickness control method for rolling wedge-shaped steel plate |
| CN103203358B (en) * | 2012-01-13 | 2015-05-20 | 宝山钢铁股份有限公司 | Rolling method capable of improving biting condition in rolling process of reversible rolling mill |
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