CN113798928B - Working roller grinding method for preventing four-roller roughing mill from slipping - Google Patents

Working roller grinding method for preventing four-roller roughing mill from slipping Download PDF

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CN113798928B
CN113798928B CN202010547320.4A CN202010547320A CN113798928B CN 113798928 B CN113798928 B CN 113798928B CN 202010547320 A CN202010547320 A CN 202010547320A CN 113798928 B CN113798928 B CN 113798928B
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grinding
roller
curve
roll
working roll
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CN113798928A (en
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李欣波
陈黎骏
王荣和
张慧慧
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/37—Single-purpose machines or devices for grinding rolls, e.g. barrel-shaped rolls

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

The invention relates to a working roller grinding method for preventing a four-roller roughing mill from slipping, which comprises the following steps of: step 1: determining the width a of a central reserved area of the half grinding roller; step 2: determining a half-grinding control curve y2 of the half-grinding roller; and step 3: determining a grinding curve of the half grinding roller; and 4, step 4: a grinding control method. In the technical scheme, the upper working roll uses a half-grinding working roll, and the lower working roll uses a full-grinding working roll. After the roll changing is finished in rolling, the whole roll body of the upper working roll is ground (fully ground) to be used as a lower working roll, and the lower working roll is only ground at two ends (half ground) to be used as an upper working roll. Therefore, the half-grinding working roll is repeatedly used as the upper working roll after each roll change, the friction coefficient is ensured through the oxide film in the peeling state, the slipping is prevented, and the slipping phenomenon does not exist in the lower working roll due to the difference of the lubricating conditions.

Description

Working roller grinding method for preventing four-roller roughing mill from slipping
Technical Field
The invention relates to a working roller grinding method for preventing a four-roller roughing mill from slipping, and belongs to the technical field of hot continuous rolling four-roller roughing mills.
Background
The high-speed steel and high-chromium cast steel working roll has good wear resistance and strong roll shape retention capability, and gradually replaces the roll made of traditional materials, thereby obtaining full recognition of hot-rolled strip steel factories. However, the hardness of the roller is improved, the friction coefficient is reduced, the roller is easy to slip in the rolling process, the rolling stability and the plate shape quality are influenced, and hidden dangers are brought to the safety of equipment. The slippage generally concentrates between 2000 tons and 10000 tons of rolling, the slippage phenomenon does not exist in the first 2000 tons, and the slippage phenomenon does not exist after 10000 tons.
For similar situations, many works have been done in various production plants and research institutes. According to the inquiry of 'hot rolling and slipping', the number of the invention patents is 10. Chinese patent application CN201810713621.2, a control method for a hot rolling roughing mill, which improves the gripping condition and resets and rolls by adjusting the rolling process. The chinese patent No. cn201410097913.x "identification and monitoring method for the slipping of the head of the strip steel biting into the machine frame during the finish rolling of the hot rolled strip steel", proposes the identification and monitoring method for the slipping of the head of the finish rolled strip steel biting into the machine frame, so as to facilitate the judgment and the corresponding treatment, and prevent the expansion of the accident. Chinese patent application CN201310354406.5, a method for preventing slab slipping at the inlet of a width fixing machine, proposes a method for preventing slab slipping by improving field working conditions and maintaining equipment precision. According to the characteristics and the abrasion condition of the roller, the Bao mountain base of Bao steel shares provides a semi-grinding method, the abrasion of a rough roller is mainly concentrated in the middle rolling area of the roller, and the rough roller needs to be replaced to a certain degree, so that the effect of a new roller shape can be achieved by only grinding the areas without rolling at the two ends from the perspective of the roller shape. Since the middle rolling area can be damaged or defect spread due to rolling, the half grinding needs to be completely ground again for 1-2 times, and the slipping condition of the newly ground roller still exists. Therefore, a new solution to solve the above technical problems is urgently needed.
Disclosure of Invention
The invention provides a working roll grinding method for preventing a four-roll roughing mill from slipping aiming at the problems in the prior art, wherein the slipping of high-speed steel and high-chromium cast steel working rolls of the four-roll roughing mill is generally shown as follows: the newly ground roller is not slipped when being used; the method is characterized in that the slipping condition begins to appear after normal production for a period of time, generally about 2000 tons; and continuing to produce for a period of time, wherein the slipping condition begins to disappear generally when the accumulated rolling reaches about 10000 tons, and the slipping condition generally does not occur in the subsequent production. Analyzing the service cycle of the working roll, starting to use the ground roll without slipping, and showing that the surface roughness of the ground roll meets the steel rolling biting condition; after the first stage of use, the surface of the roller begins to generate an oxide film, the surface of the nascent oxide film is smooth and clean, the friction coefficient is low, and the biting condition of steel rolling cannot be met; after the production is continued for a certain period, the oxide film on the surface of the roller begins to peel off due to abrasion, and the peeled surface becomes rough. At this time, the friction coefficient begins to rise, and the steel rolling biting condition can be satisfied. In the subsequent rolling process, on one hand, the oxide film on the surface of the roller is abraded and peeled off due to rolling, on the other hand, the high temperature in the rolling process enables the surface of the roller to be continuously oxidized to form the oxide film, and the oxide film on the surface of the roller reaches the peeling and regeneration balance state. In the whole roll service cycle, only when the primary oxide film is not peeled off, the friction coefficient is small, and the steel rolling biting condition cannot be met. Only two ends are worn to keep a normal roll shape, and the middle oxidation film is still in a stripping and regeneration state and can still meet the biting condition.
The steel rolling bite condition requires that the friction coefficient (between the roll and the strip) be greater than the tangent of the bite angle (trigonometric function). The biting angle is related to the rolling reduction and the diameter of the roller, and the smaller the rolling reduction is, the smaller the biting angle is; the larger the roll diameter, the smaller the bite angle. The friction coefficient is influenced by a plurality of factors, and the friction coefficient is influenced by the material, speed, temperature, lubrication state and the like of the roller. Therefore, the biting angle can be reduced by selectively using the large-diameter working roll through process adjustment such as reduction of the rolling reduction, the friction coefficient can be improved through reduction of the speed and temperature optimization, and the slip phenomenon can be controlled. However, in many cases these factors are not controllable and can only be fully utilized. Analysis shows that the steel rolling slip of the four-roller roughing mill starts from the upper roller, and the slip is caused mainly because a large amount of accumulated water is on the upper surface of the strip steel due to process water such as descaling and the like, so that the obvious lubricating effect is achieved, the friction coefficient is reduced, and the slip is caused.
The invention provides a method for preventing a working roll of a four-roll roughing mill from slipping. The full grinding roller is a working roller ground by the grinding method of the original working roller, namely the roller shape is controlled according to an original curve (y 1= f (x)), and various control accuracies such as roughness, roller shape accuracy, cylindricity and the like meet standard requirements. Except for the transition region, various control accuracies such as roughness, roller shape accuracy, cylindricity and the like of the grinding part of the semi-grinding roller also meet standard requirements, the transition region and the non-grinding region do not need to be processed, and the original state of the non-grinding region is reserved. After the roll change is finished, the roll body of the upper working roll is completely ground (fully ground) to be used as a lower working roll, and the lower working roll is only ground at two ends (half ground) to be used as an upper working roll. Therefore, the half-grinding working roll is repeatedly used as the upper working roll after each roll change, the friction coefficient is ensured through the oxide film in the peeling state, the slipping is prevented, and the slipping phenomenon does not exist in the lower working roll due to the difference of the lubricating conditions.
In order to achieve the above object, a work roll grinding method for preventing a four-high roughing mill from slipping according to an aspect of the present invention includes:
step 1: determining the width a of a central reserved area of the half grinding roller;
taking the following general: a = b + f
Wherein: b is the minimum rolling width, f is the half mill adjustment, and f is generally 0-100 (mm).
The larger the reserved area is, the better the improved hydroplaning effect is, but the smaller the grinding amount is, the more defects are not eliminated, and the greater the safety risk of the roller is. The grinding device needs comprehensive balance, can be increased or decreased according to actual effects, and can increase the grinding amount as much as possible on the premise of guaranteeing no slip in principle, reduce the width of a middle reserved area and guarantee the safety of the roller.
Step 2: determining a half-grinding control curve y2 of the half-grinding roller;
a half-grinding control curve of y2=0 (0-less-x (c-a)/2);
half grind control Curve y2= k (x- (c-a)/2) 2 ((c-a)/2<x≤c/2)；
Semi-grind control Curve y2= k ((c + a)/2-x) 2 (c/2<x≤(c+a)/2)；
Half mill control curve y2=0 ((c + a)/2-straw-x-straw-c);
wherein: c is the length of the roller body of the roller, k is the curve half-mill gradient, and is generally 0.005-0.05;
the roll must be smooth after half-grinding, which requires that at the transition, Δ x approaches 0, Δ y approaches 0, and Δ y approaches 0 ， The (first derivative) tends to 0. (the highest power is 2 at the minimum); the purpose of the half-mill control curve is to keep the grinding wheel away from the roll surface and out of contact with the roll surface when the grinding wheel is not grinding a part during grinding. And the smooth transition between the grinding parts at two ends and the non-grinding part in the middle is kept, so that the damage and the failure of the roller caused by stress concentration in the rolling process are prevented.
The maximum contact stress of the work rolls of the four-high rolling mill is not between the rolled material and the work rolls but between the work rolls and the back-up rolls. All rolling pressure needs to be borne on the working roll and the supporting roll, the contact area of the working roll and the rolled stock is the product of the contact arc length and the rolled stock width, and the contact area of the working roll and the supporting roll is a line segment theoretically. Due to the influence of the rolling pressure, the working roll and the back-up roll in the contact area are both flattened, which is equivalent to the diameter increase, so as to increase the contact area. When the roll shapes of the working roll and the supporting roll are not matched, stress concentration exists, and when the stress concentration is serious, the working roll or the supporting roll is damaged, so that the roll fails.
And step 3: determining a grinding curve of the half grinding roller;
3-1) original curve is set as y1= f (x)
3-2) half-grinding control curve is y2
3-3) grinding curve y3= y1+ y2.
And 4, step 4: and the grinding control method comprises the steps of grinding according to a grinding curve y3= y1+ y2, measuring the length d of a middle non-grinding part, and finishing grinding when | d-a | is less than or equal to e.
Wherein d is the length of the non-grinding area, e is the allowable deviation, and generally e is 5-10mm.
Compared with the prior art, the method has the advantages that after the method is adopted, the lower working roll always uses a full-grinding working roll, the upper working roll always uses a half-grinding working roll, the friction coefficient is higher because an over-peeled oxidation film exists in the middle area of the upper working roll, the oxidation film always maintains the peeling and regeneration balance state in the subsequent rolling process, and no slipping occurs. Because each half-grinding working roller of the roller needs to be fully ground again when used once, relevant detection is carried out, and the equipment is safe and controllable.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the following detailed description is given in conjunction with the examples.
Example 1: a work roll milling method for preventing slippage in a four high roughing mill, said method comprising the steps of:
step 1: determining the width a of a central reserved area of the semi-grinding roller;
taking the following general: a = b + f
Wherein: b is the minimum rolling width, f is the half-mill adjustment, and f is generally 0-100 (mm).
The larger the reserved area is, the better the improved hydroplaning effect is, but the smaller the grinding amount is, the more defects are not eliminated, and the greater the safety risk of the roller is. The grinding device needs comprehensive balance, can be increased or decreased according to actual effects, and can increase the grinding amount as much as possible on the premise of guaranteeing no slip in principle, reduce the width of a middle reserved area and guarantee the safety of the roller.
And 2, step: determining a half-grinding control curve y2 of the half-grinding roller;
a half-grinding control curve of y2=0 (0-less-x (c-a)/2);
half grind control Curve y2= k (x- (c-a)/2) 2 ((c-a)/2<x≤c/2)；
Half mill control curve y2= k ((c + a)/2-x) 2 (c/2<x≤(c+a)/2)；
Half mill control curve y2=0 ((c + a)/2-straw-x-straw-c);
wherein: c is the length of the roller body of the roller, k is the curve half-mill gradient, and is generally 0.005-0.05;
the roll must be smooth after half-grinding, which requires that at the transition, Δ x approaches 0, Δ y approaches 0, and Δ y approaches 0 ， The (first derivative) tends to 0. (the highest power is 2 at the minimum);
the purpose of the semi-grinding control curve is to keep the grinding wheel away from the roll surface and out of contact with the roll surface when the grinding wheel is not grinding a part during grinding. And the smooth transition between the grinding parts at two ends and the non-grinding part in the middle is kept, so that the damage and the failure of the roller caused by stress concentration in the rolling process are prevented.
The maximum contact stress of the work rolls of the four-high rolling mill is not between the rolled material and the work rolls but between the work rolls and the back-up rolls. All rolling pressure needs to be borne on the working roll and the supporting roll, the contact area of the working roll and the rolled stock is the product of the contact arc length and the rolled stock width, and the contact area of the working roll and the supporting roll is a line segment theoretically. Due to the influence of rolling pressure, the working roll and the backing roll are flattened in the contact area, which is equivalent to the increase of the diameter, so that the contact area is increased. When the roll shapes of the working roll and the supporting roll are not matched, stress concentration exists, and when the stress concentration is serious, the working roll or the supporting roll is damaged, so that the roll fails.
And step 3: determining a grinding curve of the half grinding roller;
3-1) original curve is set as y1= f (x)
3-2) half-grinding control curve is y2
3-3) grinding curve y3= y1+ y2.
And 4, step 4: and the grinding control method comprises the steps of grinding according to a grinding curve y3= y1+ y2, measuring the length d of a middle non-grinding part, and finishing grinding when | d-a | is less than or equal to e.
Wherein d is the length of the non-grinding area, e is the allowable deviation, and generally e is 5-10mm.
Application example 1:1780 production line four-roller roughing mill R2 working roller grinding method.
Step 1, determining the width a of a central reserved area of a semi-grinding roller;
a＝b+f＝940(mm)；
wherein: 1780 minimum rolling width 900, half grinding adjustment f, 40 mm;
step 2, determining a half-grinding control curve y2 of the half-grinding roller;
a half-grinding control curve is that y2=0 (0 is formed by the straw and the x is less than or equal to 420);
half mill control curve y2=0.01 x-420) 2 (420<x≤890)；
Half-mill control curve y2=0.01 x (1360-x) 2 (890<x≤1360)；
Half-grind control curves y2=0 (1360 woven-straw x woven-straw 1780);
wherein: the length of the roller body of the roller is 1780, and the half-grinding gradient of the curve is 0.01
The roll must be smooth after half-grinding, which requires that at the transition, Δ x approaches 0, Δ y approaches 0, and Δ y approaches 0 ， The (first derivative) tends to 0. (the maximum power is 2 at the minimum)
And step 3, determining a grinding curve of the half grinding roller.
3-1) original curve is set as y1= f (x)
3-2) half-grinding control curve is y2
3-3) grinding curve y3= y1+ y2.
And 4, grinding according to a grinding curve y3= y2 by using a grinding control method, measuring the length d of the middle non-grinding part, and finishing grinding when | d-a | is less than or equal to 5.
Where d is the length of the unground area, the tolerance was measured to 5mm.
The invention has the technical effects that: after the method is adopted, the lower working roll always uses a full-grinding working roll, the upper working roll always uses a half-grinding working roll, and because the stripped oxide film exists in the middle area of the upper working roll, the friction coefficient is higher, the oxide film always maintains the stripping and regeneration balance state in the subsequent rolling process, and no slipping occurs. Because each half-grinding working roller of the roller needs to be fully ground again when used once, relevant detection is carried out, and the equipment is safe and controllable.
Application example 2:1422 production line four-roll roughing mill R2 working roll milling method.
Step 1, determining the width a of a central reserved area of the semi-grinding roller.
a＝b+f＝650+50＝700(mm)
Wherein: 1422 production line minimum rolling width is 650mm, and half mill adjustment amount is 50 (mm).
Step 2, determining a half grinding control curve y2 of the half grinding roller
Half grind control Curve, y2=0 (0-Ap x ≦ 375)
Half mill control curve y2=0.01 x (x-375) 2 (375<x≤725)
Half mill control curve y2=0.01 x (1100-x) 2 (725<x≤1100)
Half grind control Curve y2=0 (1100 Ap over x Ap 1450)
Wherein: the length of the roller body is 1450, and the half-grinding gradient of the curve is 0.01
The roll must be smooth after half-grinding, which requires that at the transition, Δ x approaches 0, Δ y approaches 0, and Δ y approaches 0 ， The (first derivative) tends to 0. (the maximum power is 2 at the minimum)
And step 3, determining a grinding curve of the half grinding roller.
3-1) original curve is set as y1= f (x)
3-2) half-grinding control curve is y2
3-3) grinding curve y3= y1+ y2.
And 4, grinding according to a grinding curve y3= y2 by using a grinding control method, measuring the length d of the middle non-grinding part, and finishing grinding when | d-a | is less than or equal to 5.
Where d is the length of the unground area, the tolerance was measured to 5mm.
After the method is adopted, the lower working roll always uses a full-grinding working roll, the upper working roll always uses a half-grinding working roll, and because the stripped oxide film exists in the middle area of the upper working roll, the friction coefficient is higher, the oxide film always maintains the stripping and regeneration balance state in the subsequent rolling process, and no slipping occurs. Because each half-grinding working roller of the roller needs to be fully ground again when used once, the related detection is carried out, and the equipment is safe and controllable.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.

Claims (1)

1. A work roll milling method for preventing slippage in a four high roughing mill, the method comprising the steps of:
step 1: determining the width a of a central reserved area of the semi-grinding roller;
and 2, step: determining a half grinding control curve y2 of the half grinding roller;
and step 3: determining a grinding curve of the half grinding roller;
and 4, step 4: a grinding control method;
the step 1: determining the width a of a central reserved area of the semi-grinding roller; the method comprises the following specific steps:
taking: a = b + f;
wherein: b is the minimum rolling width, f is the half-mill adjustment amount, f is 0-100 mm,
the step 2: determining a half-grinding control curve y2 of the half-grinding roller;
a half-grinding control curve, wherein y2=0 (0 < -x < -less than or equal to (c-a)/2);
half grind control Curve y2= k (x- (c-a)/2) 2 （(c-a)/2<x≤c/2)；
Half mill control curve y2= k ((c + a)/2-x) 2 （c/2<x≤(c+a)/2)；
Half-mill control curve y2=0 ((c + a)/2 < -x < -c);
wherein: c is the length of the roller body of the roller, k is the curve half-grinding gradient, and 0.005-0.05 is taken;
the roll must be smooth after half-grinding, which requires that at the transition, Δ x approaches 0 and Δ y approachesAt 0, Δ y ， (first derivative) tends to 0;
the step 3: determining a grinding curve of the half grinding roller;
3-1) setting the original curve as y1= f (x);
3-2) the half-grinding control curve is y2;
3-3) grinding curve y3= y1+ y2;
the step 4: grinding according to a grinding curve y3= y1+ y2, measuring the length d of a middle non-grinding part, and finishing grinding when | d-a | is less than or equal to e;
wherein d is the length of the non-grinding area, e is the allowable deviation amount, and e is 5-10mm.
CN202010547320.4A 2020-06-16 2020-06-16 Working roller grinding method for preventing four-roller roughing mill from slipping Active CN113798928B (en)

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JP3502000B2 (en) * 2000-01-25 2004-03-02 株式会社日立製作所 Online roll grinding method
CN100463735C (en) * 2005-03-25 2009-02-25 鞍钢股份有限公司 Worker roller sweep both paying attention to board type control and free regulation rolling
JP2010137230A (en) * 2008-12-09 2010-06-24 Jfe Steel Corp Method for preventing slippage during start of rotation of roll of rolling mill in hot rolling line and method of manufacturing hot-rolled metal strip
CN101554635B (en) * 2009-05-18 2011-01-26 首钢总公司 Method for configuring shape of supporting roll of four-high mill and shape of working roll thereof
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