CN102581024A - 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 rail rail high pass long wave flowing control method.
Background technology
Adopt omnipotent production line to control the rail of production automatically, all have the moving problem of rail high pass long wave, promptly bottom width dimensional discrepancy amplitude is bigger.The rail of different size, material; The 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 on elongated direction, and the AGC that compensates through 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, the high speed heavy rail is reached the standard grade and all will be carried out the manual work polishing to aforementioned " the fluctuation section " that the high unusual fluctuations of rail occur when using, and reduces crop loss simultaneously so that bottom width meets the demands.
General analysis is thought; Cause the reason of the high fluctuation of rail 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 inequality by theoretical its tandem rolling tension force, and 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 one 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 the single closed loop of interior ring combine; With calibrator as feedback element, with the deviation signal of calibrator value of feedback and thickness set-point be input to earlier PID controller based on Smith prediction device function be input to again in PID controller in the single closed loop of ring; 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 handled these signals by control module; Use touch-screen HMI to be provided with 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, and the feedback response speed of calibrator is fast; Significantly improved the control accuracy and the stability of system, installed and debugged simple, easy to operate, reliable.”
This patent application must utilize calibrator to obtain and revise follow-up rolling thickness through rolling sheet metal thickness deviation; Be 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 had no data correction at all, it is just bigger just to have begun one section rolling its thickness error of sheet material; The execution of its final argument is the input realization through 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 big 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 that roll forming factor and roll gap size factor; Head, waist, end each several part extensional also influence each other, and thus, can not directly this method be applied to the size fluctuation control of the rail with complex section; And to remove to explore the compensating control method that is suitable for rail compound section shape according to the natural law.
Open day is on August 23rd, 2006; Publication number is the method for controlling thickness that the one Chinese patent application of CN1820864A discloses a kind of tandem mill; In any support of tandem mill; When 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 said 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 generation that goes out side tension force in the time of will nipping because of next support and the disappearance of going into 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 through the L2 level.
Annotate: in rolling control, the L1 level is meant the direct system that the operation of autonomous device is controled; The L2 level is meant 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 rail rail high pass long wave flowing control method that improves the high elongated control accuracy of rail 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 products in same big 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 the fluctuation fragment position and the fluctuating range thereof of the high elongated unusual fluctuations of rail 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; Make the interior high fluctuating range of rail of fluctuation section reduce, thereby realize rolling control, 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 fluctuation section.
The technical solution adopted for the present invention to solve the technical problems is: rail rail high pass long wave flowing control method may further comprise the steps:
I, production is obtained according to pair rolling needs the rail high detection curve of roll out steel rail under normal rolling situation, and the moving unusual part of the high pass of must overstepping the limit long wave is at the average deviation y of distribution length l on the rail and the high fluctuation of rail on distribution length l;
II, the average deviation y that fluctuates according to the rail height confirm the compensation position on the rail profile, and confirm and compensate the roll gap offset K at corresponding rolling position, position;
III, the milling train milling train by way of compensation of selecting rolling corresponding site according to the compensation position are selected n passage passage by way of compensation according to roll gap offset K, roll gap offset K is dispensed to respectively compensates passage; And; Inferior the closer to the finished product duct, the absolute value of the roll gap compensation rate Kn on the single compensation passage is more little, and n is the quantity of compensation passage; N is a positive integer, K1+ ... + Kn=K;
IV, determine according to the distribution length l of the moving unusual part of rail high pass long wave on rail and to need compensating length L;
V, when roll out steel rail, need on the compensating length L to confirm the roll gap S=s-Kn at rolling position on the compensation milling train at rail according to roll gap compensation rate Kn, wherein s is normal normal roll gap when rolling; When reach need compensating length L after, said 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 directly compensate; 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 confirm:
When serving as the compensation position with a thick position, roll gap offset K=y * b;
When serving as the compensation position with flange of rail thickness position, roll gap offset K=y * b;
When serving as the compensation position with head breadth position, roll gap offset K=-y * b ÷ b3;
When serving as the compensation position with the thick position of waist, 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 confirming 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 confirming 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 confirming 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 on two compensation passages at least, makes 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 on a rolling pass, accomplish the compensation of roll gap.
Further, in step IV, need compensating length L to confirm 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 point to the inverse j passage in finished product 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 confirming according to rolling experience;
B---Thermal Contraction Coefficient is the dimensionless constant of confirming 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 all begin continuous calculating from the termination of rail sensing milling train with need compensating length L.
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; Confirm that corresponding compensation position, compensation milling train, roll gap offset, compensation passage and roll gap offset are dispensed to the roll gap compensation rate of each compensation passage; Need to confirm 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 has effectively controlled the high fluctuation of rail of rail fluctuation section; Make the high elongated deviation of rail of whole rail product reduce, 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 a flow chart of the present invention.
Fig. 2 is the sketch map of rail profile.
Fig. 3 is the milling train arrangement technology figure of embodiment one, two and Comparative Examples thereof.
Fig. 4 is that the second edging mill E2 goes up the steel rail rolling sketch map among Fig. 3.
Fig. 5 is that universal mill UF goes up the steel rail rolling sketch map 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, time horizontal roller 4, last horizontal roller 5, the edging mill.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Statement; Concise and to the point for narrating; In this manual, " the distribution length l of the moving unusual part of rail high pass long wave 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 that the finished product duct is inferior.
Like Fig. 1～shown in Figure 9, rail rail high pass long wave flowing control method 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 under 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 distribution length l on the rail and the high fluctuation of rail on distribution length l.
II, the average deviation y that moves according to rail high pass long wave confirm the compensation position on the rail profile, and confirm and compensate the roll gap offset K at corresponding rolling position, position; Common sheet material when rolling only a milling train get final product, it is rolling that it only has two faces to receive, and only retrains at thickness direction; The slit that when regulating sheet material, only need control top and bottom rolls gets final product, and does not exist to select the compensation position, and is different with common sheet material; As shown in Figure 1, rail rolled piece 1 has comparatively complicated section, forms production lines with each position of roll out steel rail rolled piece 1 successively for the complicated section of moulding must use many milling trains; 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 receives the effect of a plurality of rolls simultaneously, horizontal roller 6 under horizontal roller 7 and the edging mill on the edging mill for example shown in Figure 4; And head edger roll 2 shown in Figure 5, bottom edger roll 3, following horizontal roller 4 and last horizontal roller 5; And according to the rule of flow of metal, must have influence on other position, so will take influencing each other between each position of section into account during steel rail rolling moulding control the change of a certain size; This makes steel rail rolling control become complicated more; But the unity of opposites is therewith, also can utilize this influencing each other to reach the target of control, promptly can select to compensate the position; Selected compensation position might not be a thick position or the flange of rail thickness position that directly influences the high H of rail, this moment corresponding adjusting be the roll gap of universal mill head edger roll or bottom edger roll; Also possibly 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 the roll gap between the upper and lower horizontal roller of roll gap or universal mill between the upper and lower horizontal roller of edging mill or finisher, this just has bigger difference with the sheet material that only just can compensate through 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 through limited test.
III, the milling train milling train by way of compensation of selecting rolling corresponding site according to the compensation position are selected n passage passage by way of compensation according to roll gap offset K, roll gap offset K is dispensed to respectively compensates passage; And; Inferior the closer to the finished product duct, the absolute value of the roll gap compensation rate Kn on the single compensation passage is more little, and n is the quantity of compensation milling train; N is a positive integer, K1+ ... + Kn=K.
Need to prove: the positive and negative of K and Kn should be confirmed according to direction and the roll gap compensation formula confirmed in the pair rolling process modeling; To this, those skilled in the art can should make corresponding roll gap broaden or narrow down to judge 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 on the compensating length L to confirm the roll gap S=s-Kn at rolling position on the compensation milling train at rail according to roll gap compensation rate Kn, 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, utilizes AGC can detect the roll-force of rolling front end rail, thereby utilizes detected deviation data correction roll gap to reduce deviation; Because AGC is actually the rail of revising the rear end through the deviation of front end, so its correction is that hysteresis quality is arranged, therefore; Change one section rail greatly for just beginning rolling one section rail or rolling stress; Its correction just can't be carried out, but since in pair rolling control the sudden change section to have only length be one section rail of l, so the roll gap compensation only is used to the rolling control of the section of fluctuation; Behind rolling intact need compensating length L, just can be returned to normal AGC control.The production of rail is to be formed by each milling train continuous rolling on the production line; The milling train that confirm to need can to confirm rolling corresponding site behind the position of compensation is as optional compensation milling train, and then utilizes roll gap offset K and roll gap compensation rate Kn to revise the roll gap of the final compensation milling train of confirming.
Method of the present invention cooperates the existing conventional control method for rolling to use; Be to utilize known data to compensate the roll gap of milling train when being in the compensation passage through converting; And only on need compensating length L, compensate, purpose is to revise blind area and the roll-force saltation zone of pair rolling control, thereby the rail high pass long wave of controlling rail moves in scope stably; Make the whole piece rail all have 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 rail rail high pass long wave well, has solved people and has wanted for a long time to solve and unsolved problem always, but also need not to adopt additional apparatus.
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 maybe be different; But general considered cross section extensional rule and roll the back thermal contraction to rolling influence will be considered these influences too when confirming to need compensating length L.
According to the long-term production practice, the inventor provides the compensation position of following recommendation and confirms method and roll gap offset K estimation equation.Concrete; Like Fig. 2, Fig. 4 and shown in Figure 5; In Step II, consider the relation of influencing each other of distortion such as rail rolled piece 1 head, waist, bottom, confirm 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 directly compensate; 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 confirm:
When serving as the compensation position with a thick position, roll gap offset K=y * b;
When serving as the compensation position with flange of rail thickness position, roll gap offset K=y * b,
When serving as the compensation position with head breadth position, roll gap offset K=-y * b ÷ b3;
When serving as the compensation position with the thick position of waist, 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 confirming 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 confirming 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 confirming according to the rolling experience of rolling steel grade, b4 ∈ [0.3,0.35].
When the high H undulate quantity of rail is big, should come the high H of direct buffer rail through 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.When serving as the compensation position with a thick 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 high simultaneously less than or the overgauge size; 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 the high H of direct buffer rail, also can come the high H of control rail indirectly through control head breadth B or the thick W of waist.
For example; In Rail Production,, then can increase a thick d through reducing head breadth B if the high H of rail compares less than normal with standard and rail bottom width F compares bigger than normally with the standard bottom width; To increase the high H of rail; The compensation milling train of selecting this moment is generally the milling train of the preceding directly control of finishing rolling mill bottom width size, and the relation of its variable quantity is calculated by empirical equation: Δ H=Δ d=-(0.20～0.30) Δ B, and wherein minus sign "-" representes that the variation delta d of a 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 confirming according to the rolling experience of rolling steel grade, b3 ∈ [0.2,0.3]; Variation delta B can realize through the upper and lower horizontal roller of adjustment upper and lower horizontal roller of edging mill or finished product hole milling train, controls roll gap offset K=y * b ÷ b3=y * (1.012～1.014) ÷ (0.2～0.3) of the milling train of head breadth B this moment.
And for example, in Rail Production, compare when thick partially if the thick W of rail waist and standard waist are thick; Then can reduce the high H of rail through the thick W of attenuate waist, the relation of its variable quantity is calculated by empirical equation: Δ H=b4 * Δ W, and 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 is the dimensionless constant of confirming according to the rolling experience of rolling steel grade, b4 ∈ [0.3; 0.35]; Variation delta W vertically depresses and can realize through horizontal roller 5 on the adjustment universal mill, controls the roll gap offset K=Δ W * b ÷ b4 of the milling train of the thick W of waist, 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 the accuracy of a plurality of sizes of rail simultaneously, 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 rail.Same rolling pass is when its roll gap compensation rate during greater than 1mm; The situation of compensation precision greater than 0.1mm can appear; The hydraulic system of milling train can down-pressing system of rolling mill slight jitter phenomenon occur because of changing fast simultaneously, and tangible 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 on two compensation passages at least; Make the roll gap compensation rate Kn on the single compensation passage satisfy | Kn|≤1mm, in the formula, n is the quantity of compensation milling train; N is a positive integer, K1+ ... + Kn=K, moving with this rail high pass long wave that little by little compensates the rail rolled piece; And it is inferior the closer to the finished product duct; The absolute value of the roll gap compensation rate Kn that is assigned with on its single compensation passage is more little, and this reduces with regard to the compensation that makes the rail rolled piece receive gradually, and its roll-force that receives 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 on a rolling pass, accomplishes the compensation of roll gap, i.e. n=1, K=K1 reduces the milling train quantity that needs adjustment, enhances productivity.Apparently, K1, K2 ..., Kn generally should be with just or with negative.
According to the long-term production practice, the inventor provides the need compensating length estimation equation of following recommendation, in step IV, needs compensating length L to confirm 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 point to the inverse j passage in finished product 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 confirming according to rolling experience;
B---Thermal Contraction Coefficient is the dimensionless constant of confirming 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 product quality in real time, so that 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 pair rolling control this moment system can't play good regulating action, the control blind area of roll-force sudden change and AGC all is positioned at rail and begins rolling position, and promptly distribution length l has only 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 through 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 distribution length l of the moving unusual part of rail high pass long wave on rail itself is very short; 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
Like Fig. 3, Fig. 4, Fig. 5 and Fig. 6, shown in Figure 7, be example with rolling 60kg/mU75V rail, the high H of its standard gauge is 176mm; Milling train arrangement technology figure is referring to Fig. 3, and the 60kg/mU75V rail adopts seven frames to produce rail, and the cogging unit is two frames; Be respectively blooming mill BD1, blooming mill BD2, omnipotent unit is five frames, and 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; 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; In its pair rolling model; The roll gap variable quantity is to broaden to just with roll gap, and universal mill UF is last accurately milling train of the high H of control rail, carries out with following step that rail high pass long wave is moving to be controlled.
I, the normal rolling situation of basis; Analyze the detection curve of the rail high H of 60kg/mU75V under normal rolling situation; This curve is as shown in Figure 6; According to the curve distribution length l=9.6m of the moving unusual part of high pass long wave on rail that must overstep the limit, the average deviation y=0.6mm of the high fluctuation of rail is promptly than the big 0.6mm of standard value of 176mm.
The average deviation y of II, the high fluctuation of rail satisfies | y|=0.6mm＞0.3mm; Confirm the high H of rail is carried out direct compensation; Promptly compensating the position is a thick position or flange of rail thickness position, because flange of rail thickness position meets standard, therefore selecting with a thick position that does not require in the rail profile examination criteria 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, the thick universal mill of direct control head milling train by way of compensation will be selected for the compensation position in a thick position; Roll gap offset K satisfies | K|≤1mm, suitable n=1, K=K1; Promptly only on a rolling pass, accomplish the compensation of roll gap, because of finishing rolling mill universal mill UF can't correct thickly directly control, selecting second from the bottom universal mill is universal mill U2 milling train by way of compensation; Confirm that the compensation passage is the 3rd passage reciprocal, j=3;
IV, consideration universal mill UF go up finished product hole lengthening coefficient a=1.15; 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, confirm the 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; Be about to head edger roll 2 on the universal mill U2 and depress 0.61mm and get 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.See that from the response speed of universal mill U2 hydraulic pressure the response time is 250 milliseconds, mill speed is 2m/s, and then corresponding length of rolled piece is 500mm, finds not exist any catastrophe point through detecting.
The high H curve of cyclical fluctuations of the 60kg/mU75V rail rail figure that utilizes the production of pair rolling method is referring to Fig. 6; The high H curve of cyclical fluctuations of the rail rail figure that this example is produced 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 basically 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
Like Fig. 3, Fig. 4, Fig. 5 and Fig. 8, shown in Figure 9; Another batch 60kg/mU75V rail; Normally rolling and milling train is arranged identical with embodiment one, and 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, the second edging mill E2, each rolling 1 passage of 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 rolling of this another batch of the inventive method control 60kg/mU75V rail.
I, the normal rolling situation of basis; Analyze the detection curve of the rail high H of 60kg/mU75V under normal rolling situation, this curve is as shown in Figure 8, according to the curve distribution length l=7.2m of the moving unusual part of high pass long wave on rail that must overstep the limit; The average deviation y=-0.25mm of the high fluctuation of rail; Promptly than the little 0.25mm of standard value of 176mm, and the thick W average out to of waist 16.9mm, than the big 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 thick partially situation of the thick W of waist, confirm to compensate through attenuate web of the rail thickness, promptly 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 thick omnipotent UF milling train that changes the free broadening of back rail high energy of waist or edging mill milling train by way of compensation.Because roll gap offset K satisfies | K|≤1mm, suitable n=1, K=K1 promptly only accomplishes the compensation of roll gap on a rolling pass, and selecting last universal mill is universal mill UF milling train by way of compensation, confirms 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, confirm the 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, and 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.See that from the response speed of universal mill UF hydraulic pressure the response time is 250 milliseconds, mill speed is 2m/s, and then corresponding length of rolled piece is 500mm, finds not exist any catastrophe point through detecting.
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; Make that the bottom width fluctuation of rail is controlled all the time, guaranteed the quality of entire product, and when controlling, need not to rely on additional apparatus; Only need original equipment to get final product, so cost is lower.
Claims (9)
1. rail rail high pass long wave flowing control method 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 under normal rolling situation, and the moving unusual part of the high pass of must overstepping the limit long wave is at the average deviation y of distribution length l on the rail and the high fluctuation of rail on distribution length l;
II, the average deviation y that fluctuates according to the rail height confirm the compensation position on the rail profile, and confirm and compensate the roll gap offset K at corresponding rolling position, position;
III, the milling train milling train by way of compensation of selecting rolling corresponding site according to the compensation position are selected n passage passage by way of compensation according to roll gap offset K, roll gap offset K is dispensed to respectively compensates passage; And; Inferior the closer to the finished product duct, the absolute value of the roll gap compensation rate Kn on the single compensation passage is more little, and n is the quantity of compensation passage; N is a positive integer, K1+ ... + Kn=K;
IV, determine according to the distribution length l of the moving unusual part of rail high pass long wave on rail and to need compensating length L;
V, when roll out steel rail, need on the compensating length L to confirm the roll gap S=s-Kn at rolling position on the compensation milling train at rail according to roll gap compensation rate Kn, wherein s is normal normal roll gap when rolling; When reach need compensating length L after, said roll gap S is returned to normal normal roll gap s when rolling.
2. rail rail high pass long wave flowing control method as claimed in claim 1 is characterized in that: 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 directly compensate; 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 confirm:
When serving as the compensation position with a thick position, roll gap offset K=y * b;
When serving as the compensation position with flange of rail thickness position, roll gap offset K=y * b;
When serving as the compensation position with head breadth position, roll gap offset K=-y * b ÷ b3;
When serving as the compensation position with the thick position of waist, 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 confirming 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 confirming 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 confirming according to the rolling experience of rolling steel grade, b4 ∈ [0.3,0.35].
3. rail rail high pass long wave flowing control method as claimed in claim 1; It is characterized in that: in Step II I; When roll gap offset K satisfies | during K|＞1mm; Then roll gap offset K is distributed on two compensation passages at least, makes 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 on a rolling pass, accomplish the compensation of roll gap.
4. like claim 1,2 or 3 described rail rail high pass long wave flowing control methods, it is characterized in that: in step IV, need compensating length L to confirm 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 point to the inverse j passage in finished product 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 confirming according to rolling experience;
B---Thermal Contraction Coefficient is the dimensionless constant of confirming according to the rolling experience of rolling steel grade, b ∈ [1.012,1.014].
5. like claim 1,2 or 3 described rail rail high pass long wave flowing control methods, it is characterized in that: in Step II I, the compensation milling train is the milling train before finishing mill and/or the finishing mill.
6. like any described rail rail of claim high pass long wave flowing control method in the claim 1～3, it is characterized in that: carrying out following steps: VI behind the step V, detecting the extremely sudden change situation of transitional region rail high (H) between normal rolling section of finished product rail compensator section.
7. like any described rail rail of claim high pass long wave flowing control method in the claim 1～3, it is characterized in that: described distribution length l and need compensating length L all begin continuous calculating from the termination of rail sensing milling train.
8. rail rail high pass long wave flowing control method as claimed in claim 7 is characterized in that: need compensating length L >=2m.
9. like any described rail rail of claim high pass long wave flowing control method in the claim 1～3, it is characterized in that: each position roll-force of rolled piece is carried out AGC control.
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| CN103252357A (en) * | 2013-05-23 | 2013-08-21 | 南京钢铁股份有限公司 | Broadening rolling method with dynamic roll gap control |
| CN105537280A (en) * | 2016-03-08 | 2016-05-04 | 攀钢集团攀枝花钢钒有限公司 | Incoming material specification control method for improving sectional uniformity of straightened steel rail |
| CN105678037A (en) * | 2016-03-23 | 2016-06-15 | 攀钢集团攀枝花钢钒有限公司 | Method for improving cross section specification through-length uniformity of corrected steel rail |
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| CN103252357A (en) * | 2013-05-23 | 2013-08-21 | 南京钢铁股份有限公司 | Broadening rolling method with dynamic roll gap control |
| CN105537280A (en) * | 2016-03-08 | 2016-05-04 | 攀钢集团攀枝花钢钒有限公司 | Incoming material specification control method for improving sectional uniformity of straightened steel rail |
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| CN109078987A (en) * | 2018-08-02 | 2018-12-25 | 攀钢集团攀枝花钢钒有限公司 | Mitigate the method for rail tail portion high point in omnipotent tandem rolling |
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