CN102581024B - Control method for full-length fluctuation of steel rail height - Google Patents
Control method for full-length fluctuation of steel rail height Download PDFInfo
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Abstract
The invention discloses a control method for full-length fluctuation of steel rail height, which is used for improving the control accuracy of full-length of the steel rail height. The control method comprises the following steps of obtaining the distribution length l of the abnormal part of the full-length fluctuation of the steel rail height on the steel rail and the mean deviation y of the fluctuation of the steel rail height according to the detection curve of the steel rail height under the condition of normal rolling of the steel rail; determining a compensation part on the railroad section and the roll gap compensation value K of a rolling part corresponding to the compensation part; selecting a compensation rolling mill and a compensation pass according to the compensation part and the roll gap compensation value K; determining the roll gap compensation Kn of the compensation pass and the length L to be compensated and adjusting the roll gap S (S=S-Kn) of the rolling part on the compensation rolling mill on the length to be compensated L of the steel rail during rolling, wherein s refers to the normal roll gap during normal rolling; and when the length L to be compensated is achieved, the roll gap S of the rolling part on the compensation rolling mill returns to the normal roll gap s. The full-length fluctuation of the steel rail height is effectively controlled, the rolling deviation is reduced, extra equipment is not needed, and the control method is mainly used for the rolling control on the steel rail.
Description
Technical field
The present invention relates to a kind of rail size fluctuation control method, especially a kind of control method for full-length fluctuation of steel rail height.
Background technology
Adopt the rail of the automatic production control of multi-function production line, all have the moving problem of rail high pass long wave, namely bottom width dimensional discrepancy amplitude is larger.The rail of different size, material, length and the deviation of the high fluctuation of its rail are different, but common ground is an end that points to the milling train direction exists the high fluctuating range of rail to be higher than the problem at other position in 0～15 meter of length direction (high corresponding with rail) " fluctuation section " usually, and difference reaches 0.3～1.2 millimeter, and roll-force is more or less the same in elongated direction, and the AGC that compensates by roll-force far can not eliminate the problem of the high unusual fluctuations of rail in " fluctuation section ".But after the fluctuation section, the elongated bottom width size of rail has obtained accurate control along with the stable of as-rolled condition, and the high fluctuating range of rail diminishes.
The high fluctuation control of rail is a global difficult problem, and the way of generally taking to optimize pass solves, but effect is all undesirable, and it is too high again that the way of taking to strengthen the crop segment length solves cost.Therefore, high speed heavy rail is reached the standard grade and all will be carried out manual polishing to aforementioned " the fluctuation section " that the high unusual fluctuations of rail occur when using, and reduces simultaneously crop loss so that bottom width meets the demands.
General analysis is thought, cause the reason of the high fluctuation of Rail comprise rail tandem rolling tension force, temperature fluctuation, advance that steel drift hits, the AGC compensation lags behind, the plant equipment response speed waits slowly, in addition, the lengthening coefficient of the head of rail, waist, the ends three part is different, should be not identical by theoretical its tandem rolling tension force, also be to cause the reason of size fluctuation but can only get an optimum tension value in the actual production.In addition, the rolling variation that causes of the pass in operation of rolling wearing and tearing also is an influence factor.
Open day is on February 11st, 2009, publication number is that the Chinese patent application of CN101362153A discloses a kind of rolling mill hydraulic AGC system and control method thereof, whole system is formed by connecting with the two closed-loop fashion of inner and outer ring that outer shroud closed loop and interior ring list closed loop combine,, the deviation signal of calibrator value of feedback and thickness set-point is input to first PID controller based on Smith prediction device function is input to again PID controller in the single closed loop of interior ring as feedback element with calibrator; The deviation signal of position sensor, pressure sensor, tension pick-up and tachymeter value of feedback is input to the PID controller; The PID controller is processed these signals by control module, use touch-screen HMI to arrange and each parameter of display system, operate and monitor each step, the present invention introduces the strategy based on the PID control of Smith prediction device function, the feedback response speed of calibrator is fast, significantly improved control accuracy and the stability of system, installment and debugging is simple, easy to operate, reliable.”
This patent application must utilize calibrator to obtain and revise follow-up rolling thickness by rolling sheet metal thickness deviation, to revise according to the parameter of measuring online rolled piece, itself just has certain hysteresis quality its correction, therefore especially just begun one section rolling sheet material and revised without any data at all, it is just larger just to have begun one section rolling its thickness error of sheet material; The execution of its final argument is the input realization by the L2 level; And because this patent is to be exclusively used in sheet material, the plate shape control of sheet material is main relevant with roll shape curve two large factors with drafts (roll gap), and the thickness of slab precision has determined that its offset is very little; And rail profile is complex-shaped, except roll forming factor and roll gap size factor, head, waist, end each several part extensional also influence each other, thus, can not directly the method be applied to the size fluctuation control of the rail with complex section, and to according to the natural law, remove to explore the compensating control method that is suitable for rail compound section shape.
Open day is on August 23rd, 2006, publication number is the method for controlling thickness that the Chinese patent application of CN1820864A discloses a kind of tandem mill, in any support of tandem mill, when the support that is arrived the downstream by the front end of rolled material or coiler device, to because of the calendering load variations that goes out this support that side tension force causes at this support and go out the thick variation of side plate and predict, and according to these predicted values the roll seam of this support and the described time of origin that goes out side tension force are operated ordinatedly, offsetting out the thick variation of side plate, the thickness of slab that the generation that goes out side tension force in the time of will nipping because of next support and the disappearance that enters side tension force when deviating from because of the fore-stock tail end cause change be suppressed to minimum.
This patent application is the method for controlling thickness that is applicable to sheet material equally, also is to revise according to the parameter of measuring online rolled piece, and its correction still has certain hysteresis quality, and offset is also very little, and the execution of final argument also is the input realization by the L2 level.
Annotate: in roll control, the L1 level refers to directly the operation of autonomous device be operated the system of control; The L2 level refers to each equipment room control system, mainly is the system of Artificial Control rolled piece technological parameter and logistics.
Summary of the invention
Technical problem to be solved by this invention provides a kind of control method for full-length fluctuation of steel rail height that improves the high elongated control accuracy of Rail.
The thinking that the present invention solves this technical problem is, is based on a more macroscopical angle, includes the priority operation of rolling of same specification product in same large system, with formerly normal rolling result as the feedback signal input after the operation of rolling in control.Specifically, according to the measured result of mill product formerly, find out fluctuation fragment position and the fluctuating range thereof of the high elongated unusual fluctuations of Rail, concern according to the extensional of rail profile each several part, under normal control method for rolling, directly adopt the input of L1 level to regulate pointedly, so that the high fluctuating range of rail reduces in the fluctuation section, thereby realize the roll control to the fluctuation section, reach the control target that the high fluctuating range of the elongated rail of rail reduces, improves the high elongated control accuracy of rail.
The technical solution adopted for the present invention to solve the technical problems is: control method for full-length fluctuation of steel rail height may further comprise the steps:
I, production is obtained according to pair rolling needs the rail high detection curve of roll out steel rail in normal rolling situation, the moving unusual part of the high pass of must overstepping the limit long wave the distribution length l on the rail and on distribution length l the high average deviation y that fluctuates of rail;
II, determine compensation position on the rail profile according to the average deviation y of the high fluctuation of rail, and determine and the roll gap offset K that compensates corresponding rolling position, position;
III, the milling train milling train by way of compensation of selecting rolling corresponding site according to the compensation position, select by way of compensation passage of n passage according to roll gap offset K, roll gap offset K is dispensed to respectively compensates passage, and, the closer to the finished hole passage, the absolute value of the roll gap compensation rate Kn on the single compensation passage is less, and n is the quantity of compensation passage, n is positive integer, K1+ ... + Kn=K;
IV, determine according to the moving distribution length l of unusual part on rail of rail high pass long wave and to need compensating length L;
V, when roll out steel rail, need to determine according to roll gap compensation rate Kn on the compensating length L roll gap S=s-Kn at rolling position on the compensation milling train at rail, wherein s is normal normal roll gap when rolling; When reach need compensating length L after, described roll gap S is returned to normal normal roll gap s when rolling.
Further, in Step II, if the average deviation y of the high fluctuation of rail satisfies | y|＞0.3mm, then at a thick position or flange of rail thickness position straight tap into the row compensation; If the average deviation y of the high fluctuation of rail satisfies | y|≤0.3mm, then at a thick position or flange of rail thickness position or head breadth position or the thick position of waist compensate, corresponding roll gap offset K adopts following formula to determine:
During take a thick position as the compensation position, roll gap offset K=y * b;
During take flange of rail thickness position as the compensation position, roll gap offset K=y * b;
During take head breadth position as the compensation position, roll gap offset K=-y * b ÷ b3;
During take the thick position of waist as the compensation position, roll gap offset K=y * b ÷ b4;
In each calculating formula of roll gap offset K,
K---roll gap offset, the mm of unit;
Y---the average deviation of the high fluctuation of rail on distribution length l is called for short the high average deviation that fluctuates of rail, the mm of unit;
B---Thermal Contraction Coefficient is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b ∈ [1.012,1.014];
B3---the ceofficient of spread at a thick position is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b1 ∈ [0.2,0.3];
B4---the ceofficient of spread at the thick position of waist is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b4 ∈ [0.3,0.35].
Further, in Step II I, when roll gap offset K satisfies | during K|＞1mm, then roll gap offset K is distributed at least two compensation passages, so that the roll gap compensation rate Kn on the single compensation passage satisfies | Kn|≤1mm; When roll gap offset K satisfies | during K|≤1mm, then only finish the compensation of roll gap a rolling pass.
Further, in step IV, need compensating length L to determine according to following formula, L=l ÷ a * b, in the formula:
L---treat actual compensating length, the m of unit of needing of rolling rail;
L---the normal distribution length of the moving unusual part of rail high pass long wave on rail when rolling is called for short distribution length, the m of unit;
A---lengthening coefficient, relevant with the deflection of each passage in the steel rail rolling process, establish the compensation passage for pointed to the inverse j passage of finished hole by cogging, then a=a1 * a2 * a3 * ... * aj, in the formula, aj is the lengthening coefficient of j passage reciprocal, is the dimensionless constant of determining according to rolling experience;
B---Thermal Contraction Coefficient is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b ∈ [1.012,1.014].
In Step II I, the compensation milling train is the milling train before finishing mill and/or the finishing mill.
Further, carrying out following steps: VI behind the step V, detecting the extremely high sudden change situation of transitional region rail between normal rolling section of finished product rail compensator section.
More specifically, described distribution length l and need compensating length L all begin continuous calculating from the termination of rail sensing milling train.
More specifically, need compensating length L 〉=2m.
More specifically, each position roll-force of rolled piece is carried out AGC control.
The invention has the beneficial effects as follows: in the rolling automatic control program of steel, according to the high fluctuation situation of rolled products rail formerly, determine corresponding compensation position, the compensation milling train, the roll gap offset, compensation passage and roll gap offset are dispensed to the roll gap compensation rate of each compensation passage, need to determine compensating length according to the distribution length of the moving unusual part of rail high pass long wave on rail, and then on the need compensating length, the roll gap at the corresponding rolling position of compensation milling train is adjusted, the zone that changes greatly for steel rail rolling top this section rolling stress has good correcting action, thereby effectively controlled the high fluctuation of rail of rail fluctuation section, so that the high elongated deviation of the rail of whole rail product reduces, improved product quality; Can also monitor finished product rail height after rolling and catastrophe point whether occur, thereby whether the rail high pass long wave that detects the rail product is moving qualified.
Description of drawings
Fig. 1 is flow chart of the present invention.
Fig. 2 is the schematic diagram of rail profile.
Fig. 3 is embodiment one, two and the milling train arrangement technology figure of Comparative Examples.
Fig. 4 is the upper steel rail rolling schematic diagram of the second edging mill E2 among Fig. 3.
Fig. 5 is the upper steel rail rolling schematic diagram of universal mill UF among Fig. 3.
Fig. 6 is the high curve of cyclical fluctuations figure of rail (Comparative Examples of embodiment one) that adopts the pair rolling method to produce.
Fig. 7 is the high curve of cyclical fluctuations figure of the rail of embodiment one.
Fig. 8 is the high curve of cyclical fluctuations figure of rail (Comparative Examples of embodiment two) that adopts the pair rolling method to produce.
Fig. 9 is the high curve of cyclical fluctuations figure of the rail of embodiment two.
Parts, position and numbering: bottom width F, a thick d, the thick W of waist, flange of rail thickness t, the high H of rail among the figure; Blooming mill BD1, blooming mill BD2, universal mill U1, the first edging mill E1, universal mill U2, the second edging mill E2, universal mill UF; Horizontal roller 7 on horizontal roller 6, the edging mill under rail rolled piece 1, head edger roll 2, bottom edger roll 3, lower horizontal roller 4, upper horizontal roller 5, the edging mill.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Statement, concise and to the point for narrating, in this manual, " rail high pass long wave moves the distribution length l of unusual part on rail " has same implication with " distribution length l ", and " the average deviation y of the high fluctuation of rail on distribution length l " and " the average deviation y of the high fluctuation of rail " have same implication.Passage refers to rolling pass, and the 1st passage reciprocal is the finished hole passage.
Such as Fig. 1～shown in Figure 9, control method for full-length fluctuation of steel rail height of the present invention may further comprise the steps:
I, production is obtained according to pair rolling needs the rail high detection curve of roll out steel rail in normal rolling situation, analyze rail high detection curve, the moving unusual part of the high pass of must overstepping the limit long wave is at the average deviation y of the distribution length l on the rail and the high fluctuation of rail on distribution length l.
II, determine compensation position on the rail profile according to the moving average deviation y of rail high pass long wave, and determine and the roll gap offset K that compensates corresponding rolling position, position; Common sheet material when rolling only a milling train get final product, it only has two faces to be subject to rolling, only retrain at thickness direction, the slit that only need control top and bottom rolls when regulating sheet material gets final product, do not exist and select the compensation position, different from common sheet material, as shown in Figure 1, rail rolled piece 1 has comparatively complicated section, for must using many milling trains, the section of moulding complexity forms production lines with each position of roll out steel rail rolled piece 1 successively, can find out from Fig. 3～Fig. 5, rail rolled piece 1 is via many milling trains, the moulding of a plurality of rolling pass continuous rolling, on same milling train, also be subject to simultaneously the effect of a plurality of rolls, horizontal roller 6 under horizontal roller 7 and the edging mill on the edging mill shown in Figure 4 for example, and head edger roll 2 shown in Figure 5, bottom edger roll 3, lower horizontal roller 4 and upper horizontal roller 5, and the rule according to flow of metal, change to a certain size must have influence on other position, to take influencing each other between each position of section into account when therefore the steel rail rolling moulding is controlled, this is so that steel rail rolling control more complex, but the unity of opposites is therewith, also can utilize this target that influences each other to reach control, namely can select to compensate the position, selected compensation position might not be a thick position or the flange of rail thickness position that directly affects the high H of rail, this moment corresponding adjusting be the roll gap of universal mill head edger roll or bottom edger roll; Also may be head breadth position or the thick position of waist that the high H of rail is produced remote-effects, corresponding adjusting this moment be roll gap between the upper and lower horizontal roller of roll gap between the upper and lower horizontal roller of edging mill or finisher or universal mill, this just has larger difference with the sheet material that only just can compensate by control working roll roll gap.In addition, roll gap offset K can utilize empirical equation to calculate and draw according to the average deviation y of the high fluctuation of rail, also can draw according to the rule in the actual production, according to different working conditions, can obtain best roll gap offset K by limited test.
III, the milling train milling train by way of compensation of selecting rolling corresponding site according to the compensation position, select by way of compensation passage of n passage according to roll gap offset K, roll gap offset K is dispensed to respectively compensates passage, and, the closer to the finished hole passage, the absolute value of the roll gap compensation rate Kn on the single compensation passage is less, and n is the quantity of compensation milling train, n is positive integer, K1+ ... + Kn=K.
Need to prove: the positive and negative of K and Kn should be determined according to direction and the roll gap compensation formula determined in the pair rolling process modeling, to this, those skilled in the art can should be so that corresponding roll gap broadens or narrows down judges according to the roll gap compensation rate of stack.
IV, the distribution length l that moves on rail according to rail high pass long wave determine need compensating length L, according to rolling objective law, need compensating length L and distribution length l to have certain corresponding relation, needing compensating length L to utilize empirical equation to calculate according to distribution length l draws, also can draw according to the rule in the actual production.
V, when roll out steel rail, need to determine according to roll gap compensation rate Kn on the compensating length L roll gap S=s-Kn at rolling position on the compensation milling train at rail, wherein s is normal normal roll gap when rolling; When reach need compensating length L after, the roll gap S at rolling position is returned to normal normal roll gap s when rolling on the compensation milling train.
Normally rolling generally is to adopt roll-force automatic control system AGC, utilize AGC can detect the roll-force of rolling front end rail, thereby utilize detected deviation data correction roll gap to reduce deviation, because AGC is actually the rail of revising the rear end by the deviation of front end, therefore its correction is that hysteresis quality is arranged, therefore, change large one section rail for just beginning rolling one section rail or rolling stress, its correction just can't be carried out, but only having length owing to sudden change section in pair rolling control is one section rail of l, therefore the roll gap compensation only is used for the roll control of fluctuation section, rolling complete need compensating length L after, just can be returned to normal AGC and control.The production of rail is to be formed by each milling train continuous rolling on the production line, can determine the milling train of rolling corresponding site behind the position of determining to need to compensate as optional compensation milling train, and then utilize roll gap offset K and roll gap compensation rate Kn to revise the roll gap of the compensation milling train of finally determining.
Method of the present invention cooperates existing pair rolling control method to use, to utilize known data to compensate the roll gap of milling train when being in the compensation passage through converting, and only compensate at need compensating length L, purpose is to revise blind area and the roll-force saltation zone of pair rolling control, thereby the rail high pass long wave of control rail moves in scope stably, so that the whole piece rail all has the high deviation of less rail in the longitudinal direction, improve the quality of product.Evidence, it is moving to adopt method of the present invention can control well Rail high pass long wave, has solved people and has wanted for a long time to solve and unsolved problem always, but also need not to adopt extra equipment.
Different according to the difference of production line and rolling kind, the corresponding relation of the average deviation k of roll gap offset K and bottom width fluctuation may be different, but generally should consider cross section extensional rule and roll rear thermal contraction to rolling impact, when determining to need compensating length L, will consider these impacts too.
According to long-term production practices, the inventor provides the compensation position of following recommendation and determines method and roll gap offset K estimation equation.Concrete, such as Fig. 2, Fig. 4 and shown in Figure 5, in Step II, consider the relation of influencing each other of the distortion such as rail rolled piece 1 head, waist, bottom, determine that the high oscillation compensation of rail is that a thick position, flange of rail thickness position at rail rolled piece 1 carried out or carried out at other position, if the average deviation y of the high fluctuation of rail satisfies | y|＞0.3mm, then at a thick position or flange of rail thickness position straight tap into the row compensation; If the average deviation y of the high fluctuation of rail satisfies | y|≤0.3mm, then at a thick position, flange of rail thickness position or head breadth position or the thick position of waist compensate, corresponding roll gap offset K adopts following formula to determine:
During take a thick position as the compensation position, roll gap offset K=y * b;
During take flange of rail thickness position as the compensation position, roll gap offset K=y * b,
During take head breadth position as the compensation position, roll gap offset K=-y * b ÷ b3;
During take the thick position of waist as the compensation position, roll gap offset K=y * b ÷ b4;
In each calculating formula of roll gap offset K,
K---roll gap offset, the mm of unit;
Y---the average deviation of the high fluctuation of rail on distribution length l obtains the mm of unit according to the detection curve of the high H of rail;
B---Thermal Contraction Coefficient is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b ∈ [1.012,1.014];
B3---the ceofficient of spread at head breadth position is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b1 ∈ [0.2,0.3];
B4---the ceofficient of spread at the thick position of waist is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b4 ∈ [0.3,0.35].
When the high H undulate quantity of rail is larger, should come the high H of direct buffer rail by the thick position of control head or flange of rail thickness position.In the rail profile size detection standard, the flange of rail thickness of rail is had requirement, and therefore correct thick no requirement (NR), if flange of rail thickness in critical field, is selected correct thick compensating usually, changes the rail height.During take a thick position as the compensation position, roll gap offset K=y * b, the compensation milling train of selecting this moment is generally the milling train of the before accurate thick size of control head of finishing rolling mill; If flange of rail thickness is not in critical field, and flange of rail thickness and rail height are less than or greater than standard size simultaneously, can flange of rail thickness position be the compensation position then, roll gap offset K=y * b, the compensation milling train of selecting this moment is generally the milling train of the before accurate thick size of control head of finishing rolling mill.
In the high H undulate quantity of rail hour, except can the thick position of control head or flange of rail thickness position come also can come the high H of indirectly control rail by control head breadth B or the thick W of waist the high H of direct buffer rail.
For example, in Rail Production, if the high H of rail compares less than normal with standard and rail bottom width F compares bigger than normal with the standard bottom width, then can increase a thick d by reducing head breadth B, to increase the high H of rail, the compensation milling train of selecting this moment is generally the milling train of the front directly control of finishing rolling mill bottom width size, it changes the relationship between quantities and calculates by empirical equation: Δ H=Δ d=-(0.20～0.30) Δ B, wherein the variation delta d of minus sign "-" expression thick d and the variation delta B of head breadth B are inversely proportional to, b3---the ceofficient of spread at head breadth position, be the dimensionless constant of determining according to the rolling experience of rolling steel grade, b3 ∈ [0.2,0.3], variation delta B is by adjusting on the edging mill, lower horizontal roller or finished hole milling train upper, lower horizontal roller can realize, controls the roll gap offset K=y of the milling train of head breadth B * b ÷ b3=y * (1.012～1.014) ÷ (0.2～0.3) this moment.
And for example, in Rail Production, compare when partially thick if the thick W of rail waist and standard waist be thick, then can reduce the high H of rail by the thick W of attenuate waist, it changes the relationship between quantities and calculates by empirical equation: Δ H=b4 * Δ W, the variation delta H of the high H of rail is directly proportional with the variation delta W of the thick W of waist, b4---the ceofficient of spread at the thick position of waist, be the dimensionless constant of determining according to the rolling experience of rolling steel grade, b4 ∈ [0.3,0.35], variation delta W vertically depresses and can realize by horizontal roller 5 on the adjustment universal mill, control the roll gap offset K=Δ W of the milling train of the thick W of waist * b ÷ b4, y * (1.012～1.014) ÷ (0.3～0.35) this moment.
Said method has been adjusted the high H of rail indirectly, and the benefit of this adjustment mode is not only to adjust the high H of rail, can also adjust flange of rail thickness t or head breadth B or the thick W of waist, guarantees simultaneously the accuracy of a plurality of sizes of rail, thereby produces the rail of better quality.
According to practical experience, generally in 1mm, the maximum fluctuation amplitude can not surpass 1.2mm to the fluctuating range of the high H of Rail.Same rolling pass is when its roll gap compensation rate during greater than 1mm, compensation precision can appear greater than the situation of 0.1mm, the hydraulic system of milling train can down-pressing system of rolling mill slight jitter phenomenon occur because changing fast simultaneously, and obvious catastrophe point appears in specification after the compensation easily.For further improving compensation effect, when roll gap offset K satisfies | during K|＞1mm, then roll gap offset K is distributed at least two compensation passages, so that the roll gap compensation rate Kn on the single compensation passage satisfies | Kn|≤1mm, in the formula, n is the quantity of compensation milling train, n is positive integer, K1+ ... + Kn=K, moving with this rail high pass long wave that little by little compensates the rail rolled piece, and the closer to the finished hole passage, the absolute value of the roll gap compensation rate Kn that is assigned with on its single compensation passage is less, and this is just so that the compensation that the rail rolled piece is subject to reduces gradually, and its roll-force that is subject to also progressively changes to plateau, therefore the precision of last finished product rail is just higher, better quality; When roll gap offset K satisfies | during K|≤1mm, its offset is less, then only finishes the compensation of roll gap a rolling pass, i.e. n=1, K=K1, reducing needs the milling train quantity adjusted, enhances productivity.Apparently, K1, K2 ..., Kn generally should be with just or with negative.
According to long-term production practices, the inventor provides the need compensating length estimation equation of following recommendation, in step IV, needs compensating length L to determine according to following formula, L=l ÷ a * b, in the formula:
L---treat actual compensating length, the m of unit of needing of rolling rail;
L---the normal distribution length of the moving unusual part of rail high pass long wave on rail when rolling is called for short distribution length, the m of unit;
A---lengthening coefficient, relevant with the deflection of each passage in the steel rail rolling process, establish the compensation passage for pointed to the inverse j passage of finished hole by cogging, then a=a1 * a2 * a3 * ... * aj, in the formula, aj is the lengthening coefficient of j passage reciprocal, is the dimensionless constant of determining according to rolling experience;
B---Thermal Contraction Coefficient is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b ∈ [1.012,1.014].
The need compensating length L that calculates according to following formula can also be further rule of thumb data revise, to reach best.
For improving compensation precision, the compensation milling train among the Step II I should be chosen as the milling train before finishing mill and/or the finishing mill.
In order to detect the control effect, carrying out following steps: VI behind the step V, detecting the extremely sudden change situation of the high H of transitional region rail between normal rolling section of finished product rail compensator section.Utilization is investigated transitional region to the detection of finished product rail and whether is had the specification catastrophe point, grasps in real time product quality, in order to can also further revise control according to detecting data, improves the quality of product.
As previously mentioned, the normally beginning section of rail rolled piece of violent position fluctuates, because this moment, the pair rolling control system can't play good regulating action, the blind area of control of roll-force sudden change and AGC all is positioned at rail and begins rolling position, and namely distribution length l only has continuous one section usually.Therefore, for simplifying control, described distribution length l and need compensating length L all begin continuous calculating from the termination of rail sensing milling train, when carrying out deviation compensation, also can only consider this position, the deviation at other position can be revised by the pair rolling control model, and its compensation control flow can be referring to shown in Figure 1.
From theory, control method of the present invention works only relevant with the hydraulic response speed of milling train, but in fact, if the moving distribution length l of unusual part on rail itself is very short for rail high pass long wave, the effect of then using the inventive method is also not obvious,, be recommended among the step IV for this reason, need compensating length L 〉=2m.
In addition, preferred pair rolling control method is that each position roll-force of rolled piece is carried out AGC control.
Embodiment one
Such as Fig. 3, Fig. 4, Fig. 5 and Fig. 6, shown in Figure 7, take rolling 60kg/mU75V rail as example, the high H of its standard gauge is 176mm, milling train arrangement technology figure is referring to Fig. 3, the 60kg/mU75V rail adopts seven frames to produce rail, the cogging unit is two frames, be respectively blooming mill BD1, blooming mill BD2, omnipotent unit is five frames, three omnipotent, be respectively universal mill U1, universal mill U2 and universal mill UF, two edging are respectively the first edging mill E1, the second edging mill E2 is when pressing the mill milling rail of Fig. 3 technology arrangement, universal mill UF, the second edging mill E2, each rolling 1 passage of universal mill U2, and the first edging mill E1 rolls 2 passages, universal mill U1 rolls 3 passages, and in its pair rolling model, the roll gap variable quantity is to broaden as just with roll gap, universal mill UF is last accurately milling train of the high H of control rail, carries out the moving control of rail high pass long wave with following step.
I, the normal rolling situation of basis, analyze the detection curve of the rail high H of 60kg/mU75V in normal rolling situation, this curve as shown in Figure 6, according to the curve moving distribution length l=9.6m of unusual part on rail of high pass long wave that must overstep the limit, the average deviation y=0.6mm of the high fluctuation of rail is namely than the large 0.6mm of standard value of 176mm.
The average deviation y of II, the high fluctuation of rail satisfies | y|=0.6mm＞0.3mm, determine the high H of rail is carried out direct compensation, namely compensating the position is a thick position or flange of rail thickness position, because flange of rail thickness position meets standard, therefore a thick position of selecting not require in the detection of rail cross-section standard is the compensation position, its roll gap offset K=y * b=0.6 * 1.013 ≈ 0.61mm, and | K|≤1mm.
III, according to the arrangement form of rolling-mill housing, thick position is the compensation position, select by way of compensation milling train of the thick universal mill of direct control head, roll gap offset K satisfies | K|≤1mm, suitable n=1, K=K1, namely only finish the compensation of roll gap a rolling pass, because finishing rolling mill universal mill UF can't correct thickly directly control, selecting second from the bottom universal mill is by way of compensation milling train of universal mill U2, determine that the compensation passage is the 3rd passage reciprocal, j=3;
IV, the upper finished hole lengthening coefficient a=1.15 of consideration universal mill UF, the lengthening coefficient a2=1.016 of the second edging mill E2 passage, the lengthening coefficient a3=1.18 of universal mill U2 passage, lengthening coefficient a=a1 * a2 * a3, a=1.15 * 1.016 * 1.18 ≈ 1.38, the Thermal Contraction Coefficient b=1.013 of 60kg/mU75V, can draw needs compensating length L=l ÷ a * b=9.6 ÷ 1.38 * 1.013 ≈ 7.05 (m);
V, in the enterprising line program optimization of basic automatization, according to its normal rolling mill practice, the normal normal roll gap s=8.51mm when rolling in the thick position of universal mill U2 the higher authorities, on need compensating length L=7.05m, determine corresponding roll gap S=s-K1=8.51-0.61=7.9 (mm) on the universal mill U2 according to roll gap compensation rate K1=0.61mm, being about to head edger roll 2 on the universal mill U2 depresses 0.61mm and gets final product, when universal mill U2 rolled piece shut out length and is 7.05m, the roll gap at its thick position became normal 8.51mm by initial 7.9mm;
VI, according to hydraulic response speed monitoring finished product bottom width F whether catastrophe point appears.From the response speed of universal mill U2 hydraulic pressure, the response time is 250 milliseconds, and mill speed is 2m/s, and then corresponding length of rolled piece is 500mm, finds not exist after testing any catastrophe point.
Utilize the high H curve of cyclical fluctuations of the 60kg/mU75V Rail figure of pair rolling method production referring to Fig. 6, the high H curve of cyclical fluctuations of the Rail that this example is produced figure is referring to Fig. 7, can find out from the contrast of Fig. 6 and Fig. 7, when the pair rolling method is produced, the high H of rail in the deviation of initial period up to 0.6mm, and in the present embodiment, the deviation of the high H of rail is substantially in ± 0.2mm.
Following table 1 is depicted as the high numerical value contrast of the rail of using the inventive method front and back steel rail rolling head 10m.
Table 1
Embodiment two
Such as Fig. 3, Fig. 4, Fig. 5 and Fig. 8, shown in Figure 9, another batch 60kg/mU75V rail, the normal rolling milling train that reaches is arranged identical with embodiment one, milling train arrangement technology figure is referring to Fig. 3, when pressing the mill milling rail of Fig. 3 technology arrangement, remain universal mill UF, each rolling 1 passage of the second edging mill E2, universal mill U2, the first edging mill E1 rolls 2 passages, universal mill U1 rolls 3 passages, but the rolling mill practice details is slightly different, uses the inventive method and controls the rolling of this another batch 60kg/mU75V rail.
I, the normal rolling situation of basis, analyze the detection curve of the rail high H of 60kg/mU75V in normal rolling situation, this curve as shown in Figure 8, according to the curve moving distribution length l=7.2m of unusual part on rail of high pass long wave that must overstep the limit, the average deviation y=-0.25mm of the high fluctuation of rail, namely than the little 0.25mm of standard value of 176mm, and the thick W average out to of waist 16.9mm, than the large 0.4mm of standard value 16.5mm.
The average deviation y of II, the high fluctuation of rail satisfies | y|=0.25mm＜0.3mm, in conjunction with the partially thick situation of the thick W of waist, determine to compensate by attenuate web of the rail thickness, namely compensating the position is the thick position of waist, its roll gap offset K=y * b ÷ b4=0.25 * 1.013 ÷, 0.35 ≈ 0.72mm, and | K|≤1mm.
III, according to the arrangement form of rolling-mill housing, the thick position of waist is the compensation position, select by way of compensation milling train of the omnipotent UF milling train of the free broadening of rail high energy after the thick variation of waist or edging mill.Because roll gap offset K satisfies | K|≤1mm, suitable n=1, K=K1 namely only finishes the compensation of roll gap a rolling pass, and selecting last universal mill is by way of compensation milling train of universal mill UF, determines that the compensation passage is the 1st passage reciprocal, j=1;
IV, owing to be to compensate on the finished product UF universal mill, j=1, a=1, lengthening coefficient a=a1=1 then, the Thermal Contraction Coefficient b=1.013 of 60kg/mU75V, can draw needs compensating length L=l ÷ a * b=7.2 ÷ 1 * 1.013 ≈ 7.29 (m);
V, in the enterprising line program optimization of basic automatization, according to its normal rolling mill practice, the normal normal roll gap s=6.5mm when rolling in the thick position of universal mill UF the higher authorities, on need compensating length L=7.29m, determine corresponding roll gap S=s-K1=6.50-0.72=5.78 (mm) on the universal mill UF according to roll gap compensation rate K1=0.72mm, the top roll 5 that is about to universal mill UF is depressed 0.72mm and is got final product, when universal mill UF rolled piece shut out length and is 7.29m, the roll gap of its waist became normal 6.50mm by initial 5.78mm; The waist of rail is thick has at this moment become (16.9-0.72) * 1 ÷ 1.013=16.19mm by original 16.9mm, is within 15.5～17.0mm of standard-required;
VI, according to hydraulic response speed monitoring finished product bottom width F whether catastrophe point appears.From the response speed of universal mill UF hydraulic pressure, the response time is 250 milliseconds, and mill speed is 2m/s, and then corresponding length of rolled piece is 500mm, finds not exist after testing any catastrophe point.
Following table 2 is depicted as the high numerical value contrast of the rail of using the inventive method front and back steel rail rolling head 10m.
Table 2
Can find out from above two examples, use method of the present invention, foundation formerly rolled products has been carried out the anticipation of science to compensating length, compensation position and roll gap compensation rate, overcome the shortcoming of original control method, so that the fluctuation of the bottom width of rail is controlled all the time, has guaranteed the quality of whole product, and when controlling, need not to rely on extra equipment, only need original equipment to get final product, so cost is lower.
Claims (7)
1. control method for full-length fluctuation of steel rail height is characterized in that: may further comprise the steps:
I, production is obtained according to pair rolling needs the rail high detection curve of roll out steel rail in normal rolling situation, the moving unusual part of the high pass of must overstepping the limit long wave the distribution length l on the rail and on distribution length l the high average deviation y that fluctuates of rail;
II, determine compensation position on the rail profile according to the average deviation y of the high fluctuation of rail, and determine in the following manner the roll gap offset K with compensation corresponding rolling position, position,
If the average deviation y of the high fluctuation of rail satisfies | y|＞0.3mm, then at a thick position or flange of rail thickness position straight tap into the row compensation; If the average deviation y of the high fluctuation of rail satisfies | y|≤0.3mm, then at a thick position or flange of rail thickness position or head breadth position or the thick position of waist compensate, corresponding roll gap offset K adopts following formula to determine:
During take a thick position as the compensation position, roll gap offset K=y * b;
During take flange of rail thickness position as the compensation position, roll gap offset K=y * b;
During take head breadth position as the compensation position, roll gap offset K=-y * b ÷ b3;
During take the thick position of waist as the compensation position, roll gap offset K=y * b ÷ b4;
In each calculating formula of roll gap offset K,
K---roll gap offset, the mm of unit;
Y---the average deviation of the high fluctuation of rail on distribution length l is called for short the high average deviation that fluctuates of rail, the mm of unit;
B---Thermal Contraction Coefficient is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b ∈ [1.012,1.014];
B3---the ceofficient of spread at a thick position is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b1 ∈ [0.2,0.3];
B4---the ceofficient of spread at the thick position of waist is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b4 ∈ [0.3,0.35];
III, the milling train milling train by way of compensation of selecting rolling corresponding site according to the compensation position, select by way of compensation passage of n passage according to roll gap offset K, roll gap offset K is dispensed to respectively compensates passage, and, the closer to the finished hole passage, the absolute value of the roll gap compensation rate Kn on the single compensation passage is less, and n is the quantity of compensation passage, n is positive integer, K1+ ... + Kn=K;
IV, determine according to the moving distribution length l of unusual part on rail of rail high pass long wave and to need compensating length L, need compensating length L to determine according to following formula, L=l ÷ a * b, in the formula:
L---treat actual compensating length, the m of unit of needing of rolling rail;
L---the normal distribution length of the moving unusual part of rail high pass long wave on rail when rolling is called for short distribution length, the m of unit;
A---lengthening coefficient, relevant with the deflection of each passage in the steel rail rolling process, establish the compensation passage for pointed to the inverse j passage of finished hole by cogging, then a=a1 * a2 * a3 * ... * aj, in the formula, aj is the lengthening coefficient of j passage reciprocal, is the dimensionless constant of determining according to rolling experience;
B---Thermal Contraction Coefficient is the dimensionless constant of determining according to the rolling experience of rolling steel grade, b ∈ [1.012,1.014];
V, when roll out steel rail, need to determine according to roll gap compensation rate Kn on the compensating length L roll gap S=s-Kn at rolling position on the compensation milling train at rail, wherein s is normal normal roll gap when rolling; When reach need compensating length L after, described roll gap S is returned to normal normal roll gap s when rolling.
2. control method for full-length fluctuation of steel rail height as claimed in claim 1, it is characterized in that: in the step III, when roll gap offset K satisfies | during K|＞1mm, then roll gap offset K is distributed at least two compensation passages, so that the roll gap compensation rate Kn on the single compensation passage satisfies | Kn|≤1mm; When roll gap offset K satisfies | during K|≤1mm, then only finish the compensation of roll gap a rolling pass.
3. control method for full-length fluctuation of steel rail height as claimed in claim 1 or 2 is characterized in that: in the step III, the compensation milling train is the milling train before finishing mill and/or the finishing mill.
4. control method for full-length fluctuation of steel rail height as claimed in claim 1 or 2 is characterized in that: carrying out following steps after the step V: VI, detect the sudden change situation of finished product rail compensator section transitional region rail high (H) between normal rolling section.
5. control method for full-length fluctuation of steel rail height as claimed in claim 1 or 2 is characterized in that: described distribution length l and need compensating length L all begin continuous calculating from the termination that rail points to milling train.
6. control method for full-length fluctuation of steel rail height as claimed in claim 5 is characterized in that: need compensating length L 〉=2m.
7. control method for full-length fluctuation of steel rail height as claimed in claim 1 or 2 is characterized in that: each position roll-force of rolled piece is carried out AGC control.
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