CN104084428A - Method for online controlling uneven thickening of seamless steel pipe wall in reducing sizing production - Google Patents
Method for online controlling uneven thickening of seamless steel pipe wall in reducing sizing production Download PDFInfo
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Abstract
The invention discloses a method for online controlling uneven thickening of a seamless steel pipe wall in reducing sizing production. The method comprises the steps as follows: firstly, online adjustment of the roller speed is performed on each rack, piling up of steel in reducing sizing in the pipe is eliminated, reducing sizing is performed under tensile force, the evenness of the pipe wall in the pipe is improved, and the probability of an internal hexagon quality defect is reduced under the condition that the total reducing rate for reducing sizing is increased; secondly, missing tension of the head and tail parts are supplemented by increasing additional tension at the head and tail parts, reducing sizing tension borne by the free head and tail parts of a hot pierced billet is consistent with the tension borne during reducing sizing in the pipe, so that pipe wall thickening at the head and tail parts is basically consistent with the pipe wall thickening in the pipe, the axial wall thickness evenness of the steel pipe after reducing sizing is improved, end cutting loss is reduced, and the yield of the steel pipe is increased.
Description
Technical field
The invention belongs to the production technical field of hot rolled seamless steel tube, more particularly, relate to and a kind ofly at tension force, subtract the inhomogeneous method thickening of On-line Control seamless steel pipe tube wall in sizing production process.
Background technology
At present, hot rolled seamless steel tube production line be finally out of shape together operation for subtracting sizing operation, as shown in Figure 1, its principle is: adopt n (it is 3～32 that frame is counted n) frame frame tandem to arrange, the roll pass of every frame is comprised of three rolls that are mutually 120 °, adjacent frame interlaced arrangement, the frame spacing L of being separated by between the pass larynx footpath of any i and i+1 frame, the hot hollow forging that rolling process is sent here enters any i frame, automatically complete and sting steel (instant heating hollow forging head end is through the pass of i frame, advance between a frame from L, the process of the firm pass to i+1 frame), (instant heating hollow forging tail end leaves the pass of i-1 frame for stable (except stinging steel and throwing the Sizing Process that subtracts beyond steel) and throwing steel, a frame spacing L advances, leave the process of the pass of i frame) three subtract Sizing Process, when hot hollow forging end to end successively through 1, 2 ... after the pass of n frame frame, the sizing that subtracts that just completes n passage is out of shape (being accompanied by thickening or subtracting thick of tube wall), hollow forging finally becomes the seamless steel pipe that user requires size.
As shown in Figure 1, when hot hollow forging between i-2, i-1, i and tetra-frames of i+1 (in other frame of front and back without hollow forging) is all stung steel, give difference of each breast roller roll surface speed, each roll surface of each frame is given an axial pulling force of hot hollow forging to the normal pressure of hot hollow forging and friction synergy, wherein i-1 frame to the axial tension of i frame the backward pull Fb on i frame
i(b represents backward), i+1 frame is the forward pull Fa on i frame to the axial tension of i frame
i(a represents forward), the hot hollow forging in i-1 and i frame acts on when being subject to respectively forward pull and backward pull, and hot hollow forging in last frame of i-2 is only subject to forward pull Fa
i-2act on and scarce backward pull Fb
i-2, the hot hollow forging in the most previous frame of i+1 is only subject to backward pull Fb
i+1act on and scarce forward pull Fa
i+1therefore, cause tension force suffered when pipe and intermediate tube subtract sizing end to end different.In addition, in subtracting fixed diameter process, the requirement of control valve wall thickening is: the backward pull Fb of i frame
iwith forward pull Fa
ilarge as far as possible, while subtracting sizing, the metal of hot hollow forging is larger along the axial pulling force of pipe, metal is more easily to pipe axial flow, the circumferential inhomogeneous trend thickening of tube wall of pipe is less, otherwise subtract the inhomogeneous amount of swelling of sizing tube wall, causes greatly steel pipe section and axial walls to increase unevenly seriously to surpass Steel tube standard requirement and become waste product.Meanwhile, making as far as possible steel pipe section consistent with tube axial wall thickening is the basic demand that subtracts fixed diameter process control valve wall thickening.
At present, reducing sizing mill online production hot rolled seamless steel tube mainly comprises following problem:
1) for example: as shown in Figure 1, in the production of 6 frames (n=6) reducing sizing mill, the motor speed of each frame is by off-line calculated with mathematical model and be set on the operation screen of control system, the motor speed that subtracts each frame in sizing production process is constant, cannot change the online roll speed of adjusting according to production process, therefore between frame, existence is piled steel production and is caused inhomogeneous the thickening seriously and the problem requiring over Steel tube standard of tube wall section in pipe, especially when total reducing rate >=22%, outer diameter D/wall thickness S≤10 o'clock, very easily there is the mass defect of " interior six sides " and make steel pipe become waste product,
2) when hot waste tube head is through each frame, all only there is backward pull Fb
iand scarce forward pull Fa
i, on the contrary, during hot each frame of hollow forging afterbody process, all only there is forward pull Fa
iand scarce backward pull Fb
i, while passing through each frame, there is forward pull Fa in the middle part of hot hollow forging simultaneously
iwith backward pull Fb
i, this make the head of hot hollow forging and the tension force of afterbody when subtracting sizing through each frame little with pipe in tension force while subtracting sizing through each frame different.Therefore head and afterbody thicken manyly than the tube wall in pipe, cause the axial walls thickness ununiformity of steel pipe serious, increase and cutting end to end useless loss, affect Tube yield.
Summary of the invention
For deficiency of the prior art, the object of the invention is to one or more in solving the problems of the technologies described above.
The object of the invention is to solve following technical problem: 1) hot rolled seamless steel tube subtracts in sizing production process, the motor speed of each frame is constant, cannot change the online roll speed of adjusting according to production process, make between frame to exist heap steel to produce and cause pipe to interrupt that facial canal wall is inhomogeneous to be thickened and surpass Steel tube standard requirement, generation " interior six sides " mass defect when serious and make steel pipe become waste product; 2) while the waste tube head of heat, afterbody being subtracted to sizing, because free head lacks forward pull and free afterbody lacks backward pull, make the tube wall of head, afterbody thicken over the tube wall in pipe and thicken, cause the axial walls thickness ununiformity of steel pipe serious, increase the useless loss of end-grain cutting end to end.
To achieve these goals, the invention provides a kind of inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts, when hot hollow forging enters after i frame frame, automatically complete the sizing that subtracts of stinging steel, stablize and throwing steel and realize a passage, described method comprises inhomogeneous inhomogeneous the thickening of tube wall that thickens and/or control tube head, afterbody of the tube wall in control valve
Inhomogeneous the thickening specifically of tube wall in control valve comprises the following steps: subtract sizing and produce while starting, the motor speed of i frame frame is predetermined stabilized speed V2
i, the Motor torque of each frame is produced and observed to constant speed afterwards, by regulating the stabilized speed V2 of i frame frame
iguarantee the moment of torsion Na of i frame frame
ifor positive-torque and by regulating the stabilized speed V2 of i frame frame
iguarantee the moment of torsion Na of i frame frame after i-1 frame frame is thrown steel
isuitably reduce, wherein, i is positive integer and 1≤i≤n, and n is frame number and 3≤n≤32, a be 1,2,3 and 1,2,3 respectively representative sting steel stage, stabilization sub stage and throwing steel stage;
Controlling the inhomogeneous polishing that thickens equivalence backward pull when the polishing that comprises equivalence forward pull when carrying out head stings steel is controlled and afterbody throws steel of the tube wall of tube head, afterbody controls, specifically comprise the following steps: when a, tube head subtract sizing production, the motor speed of i frame frame is predetermined biting speed V1
i, when i frame frame enters the stabilization sub stage from stinging the steel stage, control the stabilized speed V2 of i frame frame
i< biting speed V1
i, while starting through the outlet side of i frame frame from the head of hot hollow forging, what make i frame frame stings steel moment of torsion N1
ibe greater than steady torque N2
iin suffered tension force and pipe, suffered tension force is suitable when guaranteeing that hot waste tube head is stung steel; When b, pipe afterbody subtract sizing production, the motor speed of i frame frame is predetermined stabilized speed V2
i, when i frame frame entered and throws steel during the stage from the stabilization sub stage, control the throwing steel speed V3 of i frame frame
i< stabilized speed V2
i, when the outlet side that departs from i-1 frame frame from the afterbody of hot hollow forging starts, make the throwing steel moment of torsion N3 of i frame frame
ibe less than steady torque N2
iin suffered tension force and pipe, suffered tension force is suitable when guaranteeing that hot hollow forging afterbody is thrown steel; C, pipe afterbody subtract sizing to be thrown after steel, and the motor speed of i frame frame is predetermined throwing steel speed V3
i, when i+1 frame, throw after steel, control the biting speed V1 of i frame frame
i> throws steel speed V3
i, wherein, i is positive integer and 1≤i≤n, n is frame number and 3≤n≤32.
According to an embodiment who subtracts the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall of the present invention, during inhomogeneous the thickening of tube wall in control valve, by regulating the stabilized speed V2 of i frame frame
iguarantee that i-1 frame frame throws the moment of torsion Na of i frame frame after steel
ilower by 0.1～8% than the steady torque in pipe.
According to an embodiment who subtracts the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall of the present invention, during inhomogeneous the thickening of tube wall in control valve, as the moment of torsion Na of i frame frame
iduring for negative torque, suitably improve the stabilized speed V2 of i frame frame
iand guarantee the moment of torsion Na of i frame frame
ifor on the occasion of.
According to an embodiment who subtracts the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall of the present invention, during inhomogeneous the thickening of tube wall in control valve, the moment of torsion Na of i frame frame after i-1 frame frame is thrown steel
iwhile raising suddenly, suitably improve the stabilized speed V2 of i frame frame
i.
According to an embodiment who subtracts the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall of the present invention, during inhomogeneous the thickening of tube wall in control valve, the moment of torsion Na of i frame frame after i-1 frame frame is thrown steel
iwhile reducing suddenly, suitably reduce the stabilized speed V2 of i frame frame
i.
According to an embodiment who subtracts the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall of the present invention, during inhomogeneous the thickening of tube wall in control valve, as the moment of torsion Na of i frame frame
iwhile occurring that in the stabilization sub stage jump changes or positive negative value fluctuation changes, replacing i frame frame.
According to an embodiment who subtracts the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall of the present invention, from the head of hot hollow forging, through the outlet side of i frame frame, that controls i frame frame stings steel moment of torsion N1
ithan steady torque N2
ilarge 0.1～8%; The outlet side that departs from i-1 frame frame from the afterbody of hot hollow forging, control the throwing steel moment of torsion N3 of i frame frame
ithan steady torque N2
ilittle by 0.1～8%.
According to an embodiment who subtracts the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall of the present invention, when controlling inhomogeneous the thickening of tube wall of tube head, afterbody, in step a, when i+1 frame frame is with V1
i+1biting speed sting steel and i+1 frame frame detected sting steel moment of torsion N1
i+1after, control the motor speed of i frame frame from biting speed V1
ibe reduced to stabilized speed V2
imove and detect the steady torque N2 of i frame frame
iafter, complete the speed control that enters the stabilization sub stage from stinging the steel stage; In step b, when i-1 frame frame is with V3
i-1throwing steel speed throw steel and the throwing steel moment of torsion N3 of i-1 frame frame detected
i-1after disappearance, control the motor speed of i frame frame from stabilized speed V2
ibe reduced to and throw steel speed V3
imove and detect the throwing steel moment of torsion N3 of i frame frame
iafter, complete from the stabilization sub stage to the speed control of throwing the steel stage; In step c, when i+1 frame frame is with V3
i+1throwing steel speed throw steel and the throwing steel moment of torsion N3 of i+1 frame frame detected
i+1after disappearance, control the motor speed of i frame frame from throwing steel speed V3
ibe increased to biting speed V1
imove and wait for that next hot hollow forging enters i frame frame, complete the speed control of throwing the steel stage.
According to an embodiment who subtracts the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall of the present invention, when controlling inhomogeneous the thickening of tube wall of tube head, afterbody, biting speed V1
ifor stabilized speed V2
i1.01～1.09 times, throw steel speed V3
ifor stabilized speed V2
i0.91～0.99 times, stabilized speed V2
ireal value of establishing of stabilized speed while deriving from inhomogeneous the thickening of tube wall in control valve.
According to an embodiment who subtracts the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall of the present invention, steady torque N2
ibe 0.010～10.0Nm, sting steel moment of torsion N1
ibe 0.010～10.0Nm, throw steel moment of torsion N3
ibe 0.010～10.0Nm; Sting steel time t1
ibe 0.20～1.6s, stabilization time t2
ibe 0～60s, throw steel time t3
ibe 0.20～1.6s.
First the present invention carries out the on-line control of roller speed (being motor speed) to each frame, eliminate the heap steel phenomenon that subtracts sizing existence in pipe, and belt tension subtracts sizing, improve the evenness of wall thickness in pipe, in the situation that increase subtracts the total reducing rate of sizing, reduce the probability that " interior six sides " mass defect occurs; Secondly, again by increasing the additional tension of head-tail, the tension force polishing that head-tail is lacked, Tensity size suffered while making hot hollow forging head-tail subtract the suffered tension force of sizing and subtract sizing in pipe is consistent, thereby realizing head-tail tube wall thickens with tube-in-tube wall thickening basically identical, improve the axial evenness of wall thickness subtract steel pipe after sizing, reduce termination and cut damage, improve Tube yield.
Accompanying drawing explanation
Fig. 1 is layout and the stressed schematic diagram of existing reducing sizing mill roll stand.
Real electrical machinery rotating speed-the time diagram of each frame when Fig. 2 is inhomogeneous the thickening of tube wall in the control valve of exemplary embodiment of the present.
Real electrical machinery moment of torsion-the time diagram of each frame when Fig. 3 is inhomogeneous the thickening of tube wall in the control valve of exemplary embodiment of the present.
Real electrical machinery rotating speed-the time diagram of each frame that Fig. 4 is the control head of exemplary embodiment of the present, the tube wall of afterbody is inhomogeneous while thickening.
Real electrical machinery moment of torsion-the time diagram of each frame that Fig. 5 is the control head of exemplary embodiment of the present, the tube wall of afterbody is inhomogeneous while thickening.
While being inhomogeneous the thickening of tube wall in the control valve of exemplary embodiment of the present, there is the moment of torsion-time diagram of the first abnormal conditions in Fig. 6.
While being inhomogeneous the thickening of tube wall in the control valve of exemplary embodiment of the present, there is the moment of torsion-time diagram of the second abnormal conditions in Fig. 7.
While being inhomogeneous the thickening of tube wall in the control valve of exemplary embodiment of the present, there is the moment of torsion-time diagram of the third abnormal conditions in Fig. 8.
While being inhomogeneous the thickening of tube wall in the control valve of exemplary embodiment of the present, there is the moment of torsion-time diagram of the 4th kind of abnormal conditions in Fig. 9.
While being inhomogeneous the thickening of tube wall in the control valve of exemplary embodiment of the present, there is the moment of torsion-time diagram of the 5th kind of abnormal conditions in Figure 10.
Illustrate:
1-frame, the hot hollow forging of 2-, L-frame spacing,
Wherein, dotted line hollow arrow represents the direction of advance of hot hollow forging, and solid arrow represents the direction of rotation of breast roller, and solid line hollow arrow represents the direction of the suffered forward pull of hot hollow forging and backward pull.
The specific embodiment
Hereinafter, the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts of the present invention will be described in detail.
Owing to subtracting in prior art when sizing is produced, mainly there are following two technical problems: 1) motor speed of each frame is constant, cannot change the online roll speed of adjusting each frame according to production process, cause between frame having heap steel and cause inhomogeneous the thickening of section tube wall in pipe and surpass Steel tube standard requirement, when serious, produce " interior six sides " mass defect and make steel pipe become waste product; 2) while the waste tube head of heat, afterbody being subtracted to sizing, because free head lacks forward pull and free afterbody lacks backward pull, the tube wall of head-tail is thickened over the tube wall in pipe and thicken, cause the axial walls thickness ununiformity of steel pipe serious, increase the useless loss of end-grain cutting end to end.
For above-mentioned technical problem, the present invention has mainly adopted following technological means to control the inhomogeneous of seamless steel pipe tube wall and has thickened: for the tube wall in pipe is inhomogeneous, thicken, adopt the mode of on-line control roller speed, the heap steel phenomenon existing while subtracting sizing to eliminate in pipe, and belt tension subtracts sizing, thereby improve inhomogeneous the thickening of tube wall in pipe; Inhomogeneous the thickening of tube wall for tube head, afterbody, by increasing the additional tension of head, afterbody, by the tension force polishing of head, afterbody disappearance, make in hot waste tube head, the suffered tension force of afterbody and pipe suffered tension force suitable, thereby improve, inhomogeneous the thickening of tube wall of afterbody.
The control device of above-mentioned two aspects both can be carried out simultaneously, also can carry out respectively targetedly for practical condition, and the present invention does not specifically limit this.According to exemplary embodiment of the present invention, what take is the mode that two aspect control devices are carried out simultaneously, first inhomogeneous the thickening of the tube wall in pipe controlled, again inhomogeneous the thickening of the tube wall of tube head, afterbody controlled, below the control mode of two aspect control devices and principle are specifically described.
First, to subtracting the stage division of sizing production process, describe.Conventionally, the Sizing Process that subtracts of each frame is divided into and stings steel, stable and throw steel three phases, and particularly, the head that the steel stage of stinging of i frame frame refers to hot hollow forging is through the pass larynx footpath of i frame frame, the frame spacing L that advances, just to the process in the pass larynx footpath of i+1 frame frame; The stabilization sub stage of i frame frame refers to from the head of hot hollow forging to the pass larynx footpath of i+1 frame frame, till the afterbody of hot hollow forging has just left the process in the pass larynx footpath of i-1 frame frame; The throwing steel stage of i frame frame refers to that the pass that the afterbody of hot hollow forging leaves i-1 frame frame shouts footpath, the frame spacing L that advances, and the pass that leaves i frame frame is shouted the process in footpath, and all the other each the rest may be inferred.When hot hollow forging enters after i frame frame, automatically complete the sizing that subtracts of stinging steel, stablize and throwing steel and realize a passage, through subtracting after sizing processing of n frame, hot hollow forging becomes the seamless steel pipe product meeting the requirements of the customers.Wherein, i is positive integer and 1≤i≤n, and n is frame number and 3≤n≤32, is also that frame is counted n and can be got any integer value in 3～32; When i=1 or i=n, the 0th and n+1 frame are virtual, and reality does not exist.
Secondly, to subtracting the control parameter of sizing production process, describe.Control parameter involved in the present invention mainly comprises motor speed (being hereinafter referred to as speed), moment of torsion and time, and wherein, the stabilized speed of i frame is expressed as V2
i, the biting speed of i frame is expressed as V1
i, the throwing steel speedometer of i frame is shown V3
i; Be expressed as t2 the stabilization time of i frame
i, the steel time representation of stinging of i frame is t1
i, the throwing steel time representation of i frame is t3
i; The steady torque of i frame is expressed as N2
i, the steel torque meter of stinging of i frame is shown N1
i, the throwing steel torque meter of i frame is shown N3
i, the moment of torsion of i frame can unified representation be Na
i, wherein, a be 1,2,3 and 1,2,3 respectively representative sting steel stage, stabilization sub stage and throwing steel stage.The collection period of above-mentioned speed, moment of torsion and time data is all below 20ms.
According to inhomogeneous the thickening of the tube wall in control valve of the present invention, comprise the following steps: subtract sizing and produce while starting, the motor speed of i frame frame is predetermined stabilized speed V2
i, the Motor torque of each frame is produced and observed to constant speed afterwards, by regulating the stabilized speed V2 of i frame frame
iguarantee the moment of torsion Na of i frame frame
ifor positive-torque and by regulating the stabilized speed V2 of i frame frame
iguarantee the moment of torsion Na of i frame frame after i-1 frame frame is thrown steel
isuitably reduce.
Particularly, according to the present invention, in subtracting sizing production process, above-mentioned predetermined stabilized speed V2
ifor technologists is given, by operating personnel, in the man-machine picture of control system, set, the motor of each frame is with above-mentioned predetermined stabilized speed V2 afterwards
ioperation.Before and after owing to subtracting sizing in pipe, in the pass of frame, all have hollow forging, before and after tube wall thickens and is subject to, interstand tension affects, and therefore needs in process of production, according to the unusual condition of tube-in-tube wall thickening inequality, to adjust the stabilized speed V2 of each frame
i, indirectly control inhomogeneous the thickening of tube-in-tube wall of each frame, thereby reach, improve the inhomogeneity object of wall thickness in pipe, reduce " interior six sides " mass defect occurrence probability.The unusual condition of above-mentioned tube-in-tube wall thickening inequality is mainly by the Motor torque Na of this frame
ijudge, mainly need make moment of torsion Na
imeet following two requirements: 1) the moment of torsion Na of i frame frame
ifor positive-torque; 2) the moment of torsion Na of i frame frame after i-1 frame frame is thrown steel
isuitably reduce.Wherein, described suitable reduction refers to the mild decline in suitable amplitude, and the reduction modes such as rapid drawdown or bust do not belong in the scope of suitable reduction.According to the present invention, by regulating the stabilized speed V2 of i frame frame
iguarantee that i-1 frame frame throws the moment of torsion Na of i frame frame after steel
ilower by 0.1～8% than the steady torque in pipe.
Real electrical machinery rotating speed-the time diagram of each frame when Fig. 2 is inhomogeneous the thickening of tube wall in the control valve of exemplary embodiment of the present, the motor speed of each frame by being constant after operating personnel set and temporal evolution not in subtracting Sizing Process.Real electrical machinery moment of torsion-the time diagram of each frame when Fig. 3 is inhomogeneous the thickening of tube wall in the control valve of exemplary embodiment of the present, from Fig. 2 and Fig. 3, can find out, i-1 frame frame is thrown after steel, and the moment of torsion of i frame frame has been compared obvious reduction with the steel moment of torsion of stinging before with steady torque.
Moment of torsion-the time diagram of the five kinds of abnormal conditions that do not meet above-mentioned requirements that occur when Fig. 6 to Figure 10 shows inhomogeneous the thickening of tube wall in the control valve of exemplary embodiment of the present, can know and cause the reason of abnormal conditions and can take appropriate measures eliminating abnormal conditions and making moment of torsion meet above-mentioned requirements according to above-mentioned moment of torsion-time diagram.
As shown in Figure 6, when the tension force of adjacent two frames is for negative, show as this frame and occur negative torque, think the hot hollow forging production in pushing away this frame of hot hollow forging in a upper frame, thereby cause the hot hollow forging in this frame to occur serious heap steel, now by suitably improving the stabilized speed V2 of this frame
isolve, work as the moment of torsion Na of i frame frame
iduring for negative torque, suitably improve the stabilized speed V2 of i frame frame
iand guarantee the moment of torsion Na of i frame frame
ifor on the occasion of.Wherein, the stabilized speed V2 of i frame frame
iincrease rate need according to the concrete condition of production, determine in production scene, for example, adjusting range≤+ 10%V2 rule of thumb
i.
As shown in Figure 7, too small when the tension force of adjacent two frames, show as a frame and throw after steel, this frame moment of torsion raises suddenly, and this can cause the hot hollow forging in this frame to occur slight heap steel, now by suitably improving the stabilized speed V2 of this frame
isolve, i.e. the moment of torsion Na of i frame frame after i-1 frame frame is thrown steel
iwhile raising suddenly, suitably improve the stabilized speed V2 of i frame frame
i.Similarly, the stabilized speed V2 of i frame frame now
iincrease rate need according to the concrete condition of production, determine in production scene, for example, adjusting range≤+ 10%V2 rule of thumb
i.
As shown in Figure 8, when the overtension of adjacent two frames, show as a frame and throw after steel, this frame moment of torsion reduces suddenly, and this can cause the hot hollow forging in this frame to occur seriously drawing steel, now by suitably reducing the stabilized speed V2 of this frame
isolve, i.e. the moment of torsion Na of i frame frame after i-1 frame frame is thrown steel
iwhile reducing suddenly, suitably reduce the stabilized speed V2 of i frame frame
i.Similarly, the stabilized speed V2 of i frame frame now
ireduction amplitude need according to the concrete condition of production, determine in production scene, for example, adjusting range≤10%V2 rule of thumb
i.
As shown in Figure 9 and Figure 10, when jumping appears in the moment of torsion of certain frame in the stabilization sub stage, change or positive negative value fluctuation changes, there is drawing steel or the too small appearance heap of tension force steel in the overtension in this frame, now judgement is that the roll surface due to this frame is aging or wear and tear excessive causing due to frictional force reduces, by this frame of timely replacing, solve, work as the Na of i frame frame
iwhile occurring that in the stabilization sub stage jump changes or positive negative value fluctuation changes, replacing i frame frame.
The tube wall of control tube head of the present invention, afterbody is inhomogeneous to be thickened is mainly that the polishing of equivalence backward pull when the polishing that carries out head equivalence forward pull while stinging steel is controlled and afterbody throws steel is controlled, and specifically comprises the following steps:
When a, tube head subtract sizing production, the motor speed of i frame frame is predetermined biting speed V1
i, when i frame frame enters the stabilization sub stage from stinging the steel stage, control the stabilized speed V2 of i frame frame
i< biting speed V1
i, while starting through the outlet side of i frame frame from the head of hot hollow forging, what make i frame frame stings steel moment of torsion N1
ibe greater than steady torque N2
iin suffered tension force and pipe, suffered tension force is suitable when guaranteeing that hot waste tube head is stung steel;
When b, pipe afterbody subtract sizing production, the motor speed of i frame frame is predetermined stabilized speed V2
i, when i frame frame entered and throws steel during the stage from the stabilization sub stage, control the throwing steel speed V3 of i frame frame
i< stabilized speed V2
i, when the outlet side that departs from i-1 frame frame from the afterbody of hot hollow forging starts, make the throwing steel moment of torsion N3 of i frame frame
ibe less than steady torque N2
iin suffered tension force and pipe, suffered tension force is suitable when guaranteeing that hot hollow forging afterbody is thrown steel;
C, pipe afterbody subtract sizing to be thrown after steel, and the motor speed of i frame frame is predetermined throwing steel speed V3
i, when i+1 frame, throw after steel, control the biting speed V1 of i frame frame
i> throws steel speed V3
i, wherein, i is positive integer and 1≤i≤n, n is frame number and 3≤n≤32.
The present invention is in order to solve tube head, the inhomogeneous quality problems that cause that thicken of afterbody tube wall, when having proposed hot waste tube head and stinging steel, the polishing of equivalence forward pull is controlled and the polishing control of equivalence backward pull when hot hollow forging afterbody throws steel, at the waste tube head of heat, afterbody, while subtracting sizing processing, apply an axially additional pulling force, force metal longitudinal flow, the tube wall of restriction head, afterbody thickens.And above-mentioned axially additional pulling force is by poor realization of certain linear speed between adjacent frame, is specially and controls biting speed V1
iwith throwing steel speed V3
irealize, by set respectively the V1 of each frame on the man-machine picture of control system
iand V3
ivalue completes, and makes afterwards torque curve meet the requirements, and whether torque curve meets the requirements is whether reasonably speed control final inspection and judgement.
When hot each frame of hollow forging process, the three phases that is divided into above-mentioned steps a to c is controlled motor speed variation, indirectly make metal flow on hot hollow forging flow according to technological requirement, reach the object that control head, afterbody tube wall thicken, the motor speed of above-mentioned three phases is controlled as follows:
1) sting the speed control that the steel stage enters the stabilization sub stage: in step a, when i+1 frame frame is with V1
i+1biting speed sting steel and i+1 frame frame detected sting steel moment of torsion N1
i+1after, control the motor speed of i frame frame from biting speed V1
ibe reduced to stabilized speed V2
imove and detect the steady torque N2 of i frame frame
iafter, complete the speed control that enters the stabilization sub stage from stinging the steel stage.The rest may be inferred for all the other each frames, meets the biting speed V1 of each frame
i> stabilized speed V2
i.
2) stabilization sub stage enters the speed control of throwing the steel stage: in step b, when i-1 frame frame is with V3
i-1throwing steel speed throw steel and the throwing steel moment of torsion N3 of i-1 frame frame detected
i-1after disappearance, control the motor speed of i frame frame from stabilized speed V2
ibe reduced to and throw steel speed V3
imove and detect the throwing steel moment of torsion N3 of i frame frame
iafter, complete from the stabilization sub stage to the speed control of throwing the steel stage.The rest may be inferred for all the other each frames, meets the stabilized speed V2 of each frame
i> throws steel speed V3
i.
3) the throwing steel stage enters the speed control of stinging the steel stage: in step c, when i+1 frame frame is with V3
i+1throwing steel speed throw steel and the throwing steel moment of torsion N3 of i+1 frame frame detected
i+1after disappearance, control the motor speed of i frame frame from throwing steel speed V3
ibe increased to biting speed V1
imove and wait for that next hot hollow forging enters i frame frame, complete from throwing the steel stage and control to the speed of stinging the steel stage.The rest may be inferred for all the other each frames, meets the biting speed V1 of each frame
i> throws steel speed V3
i.
Above-mentioned three speed control stage circulates successively, thereby complete the speed control that each hot hollow forging subtracts sizing, wherein the real electrical machinery rotating speed-time diagram of each frame is as shown in Figure 4 in this step according to an exemplary embodiment of the present invention, as can be seen from Fig. 4, the motor speed of i frame frame is once subtracting in Sizing Process, has passed through V1
iheight → V2
ifall → V3
ifall reduction of speed twice, finally raising speed arrives V1 again
ispeed, repeats next root hollow forging and produces.Wherein, stabilized speed V2
ireal value of establishing of stabilized speed (after revising) while deriving from inhomogeneous the thickening of tube wall in control valve, biting speed V1
ibe set as stabilized speed V2
i1.01～1.09 times, throw steel speed V3
ibe set as stabilized speed V2
i0.91～0.99 times.
According to the present invention, owing to stinging steel, the free head of hot hollow forging cannot really be set up forward pull Fa
i, can only be by increasing biting speed V1
i, while making i frame frame sting steel, the backward pull of head reality is than the backward pull Fb in pipe
igreatly, the forward pull Fa in the difference equivalent-effect transistor of its increase
i,, the tension force that when now head subtracts sizing, hollow forging is subject to is (Fb
i+ equivalent Fa
i), the tension force (Fb that while subtracting sizing in this and pipe, hot hollow forging is subject to
i+ Fa
i) size is the same, the size of head and wall thickening in pipe is just the same, in minimizing head and pipe between axial wall thickness ununiformity.For reaching this purpose, the head that requires hot hollow forging starts through the outlet side of i frame frame, and that controls i frame frame stings steel moment of torsion N1
ibe greater than steady torque N2
iin suffered tension force and pipe, suffered tension force is suitable when guaranteeing that hot waste tube head is stung steel.Also i frame frame sting steel moment of torsion N1
ihigher than steady torque N2
imoment of torsion difference be equivalent to the forward pull Fa of stabilization sub stage i frame frame
ithe effect that tube wall is thickened.
According to the present invention, during due to throwing steel, the free afterbody of hot hollow forging cannot really be set up backward pull Fb
i, can only be by reducing to throw steel speed V3
i, while making i frame frame throw steel, the forward pull of afterbody reality is than the forward pull Fa in pipe
igreatly, the backward pull Fb in the difference equivalent-effect transistor of its increase
i,, the tension force that when now afterbody subtracts sizing, hollow forging is subject to is equivalent Fb
i+ Fa
ithe tension force Fb that hot hollow forging is subject to when subtracting sizing in pipe
i+ Fa
isize is the same, and the size of afterbody and wall thickening in pipe is just the same, in minimizing afterbody and pipe between axial wall thickness ununiformity.For reaching this purpose, the outlet side that requires the afterbody of hot hollow forging to depart from i-1 frame frame starts, the throwing steel moment of torsion N3i that controls i frame frame be less than steady torque N2i when guaranteeing that hot hollow forging afterbody is thrown steel in suffered tension force and pipe suffered tension force suitable.Also the moment of torsion difference that the throwing steel moment of torsion N3i of i frame frame is less than steady torque N2i is equivalent to the effect that the backward pull Fbi of stabilization sub stage i frame frame thickens tube wall.
Fig. 5 shows the actual torque-time diagram of each frame in above-mentioned control step of exemplary embodiment of the present, and as seen from Figure 5, i frame frame is stung after steel, in i-1 frame frame from V1
i-1reduction of speed is to V2
i-1under effect, i frame frame is drawn i-1 frame frame by hot hollow forging, between two frames, produces Fb
i+ equivalent Fa
itension force, what cause i frame frame stings steel moment of torsion N1
ihigher than the steady torque N2 in its pipe
i, in the pipe of i-1 frame frame, subtract sizing torque ratio its to sting steel moment of torsion low.In like manner, i-1 frame frame is thrown after steel, in i frame frame from V2
ireduction of speed is to V3
iunder effect, i+1 frame frame is drawn i frame frame by hot hollow forging, produces equivalent Fb between two frames
i+ Fa
itension force, cause the throwing steel moment of torsion N3 of i frame frame
ilower than the steady torque N2 in its pipe
i, in the pipe of i+1 frame frame, steady torque is higher than its throwing steel moment of torsion.
According to one embodiment of present invention, in steps d, from the head of hot hollow forging, through the outlet side of i frame frame, that controls i frame frame stings steel moment of torsion N1
ithan steady torque N2
ilarge 0.1～8%; The outlet side that departs from i-1 frame frame from the afterbody of hot hollow forging, control the throwing steel moment of torsion N3 of i frame frame
ithan steady torque N2
ilittle by 0.1～8%.According to field experience, this value has an optimum value to the steel pipe of each specification, needs according to subtracting after sizing in head, afterbody that hot hollow forging sample and measured steel pipe and pipe the even degree thickening of wall unevenness big or smallly, carries out the real-time correction at scene.If unconfined increase tension force, may break hot hollow forging or surpass the frictional force between two frames, make to skid between hot hollow forging and roller.
In addition, of the present invention subtracting in sizing production, controls steady torque N2
ibe 0.010～10.0Nm, sting steel moment of torsion N1
ibe 0.010～10.0Nm, throwing steel moment of torsion N3
ibe 0.010～10.0Nm; Steel time t1 is stung in control
ibe 0.20～1.6s, stabilization time t2
ibe 0～60s, throwing steel time t3
ibe 0.20～1.6s.Above parameter can also, according to actual condition adjustment, the invention is not restricted to this.
Below in conjunction with concrete example, further illustrate the present invention.
This example is to be the BNS pipe of φ 168.3 * 10.97 climbing into production specification on 12 sizing mills of steel 340 tandem rolling units, specifically comprises the following steps:
Sizing deformation program: the external diameter of the hot hollow forging of entrance is that the external diameter of φ 226mm → outlet thermo-optical pipe is that the external diameter of φ 169.81mm → cold rear steel pipe is φ 168.3mm, and total reducing rate is 24.8%.
Design Sizing Pass series: can complete distortion by 10 frames, the maximum reducing rate of single frame is 3.3%, is followed successively by: 222.28,214.95,207.86,201.02,194.41,188.02,181.85,176.05,171.81,169.81 from each frame pass diameter (mm) of the 1st to the 10th.
First theory is calculated the V2 of each frame
ivalue, during production by the V2 of each frame
ivalue is set on the human-machine operation picture of sizing mill, produces and observe the torque value of each frame as a trial, finds that the 1st frame has negative torque, improve the speed of the 1st frame, until be on the occasion of, the control method of other frame is the same, finally from each frame stabilized speed V2 of the 1st to the 10th
i(rpm) setting value is as follows: 864,889,897,904,912,919,930,924,915,903.N2
i(Nm) be: 0.51,0.57,0.63,0.65,0.66,0.71,0.70,0.68,0.51,0.26.
In process of production, there is not negative torque in each frame, and after i-1 frame frame is thrown steel, the moment of torsion of i frame frame has 0.1～3% reduction, when sizing is described in pipe, between each frame, is with Minimal Tension, stablizes footpath and meet theoretical requirement of the present invention in pipe.
Afterwards, in actual measurement pipe, sizing wall thickening amount is 0.65～0.7mm, the head of pipe than thickening 0.50～0.55mm in pipe more, the afterbody of pipe than thickening 0.4～0.45mm in pipe more, therefore cause the axial walls thickness ununiformity of head, middle part and the afterbody of steel pipe, more than the wall thickness extreme difference only affecting because of sizing operation reaches 0.5mm, more than crop end loss always reaches 1.4m.
Therefore, head and the afterbody at hot hollow forging adopts trapezoidal speed by the tension force polishing of disappearance.At man-machine picture, set respectively the biting speed V1 of each frame
iwith throwing steel speed V3
i, first observe i frame frame and sting after steel, the moment of torsion N1 of i frame frame
iwhether be increased to higher than N2
i5% left and right (first by 5% coarse adjustment, be no more than maximum empirical value 8%), if be not raised to position, then improve successively the V1 of i frame frame
ispeed, until N1i meets the demands.Observe again i-1 frame frame and throw after steel, the moment of torsion N3 of i frame frame
iwhether be reduced to lower than N2
i5% left and right (first by 5% coarse adjustment, be no more than maximum empirical value 8%), if do not drop to position, reduce successively the V3 of i frame frame
ispeed, until meet N3
imeet the demands.Wherein, from the biting speed V1 of each frame of the 1st to the 10th
iwith throwing steel speed V3
ibe set as follows respectively:
The biting speed V1 of head
i: 1.012 * V2
i, 1.013 * V2
i, 1.014 * V2
i, 1.021 * V2
i, 1.031 * V2
i, 1.036 * V2
i, 1.040 * V2
i, 1.042 * V2
i, 1.044 * V2
i, 1.044 * V2
i.
The throwing steel speed V3 of afterbody
i: 0.988 * V2
i, 0.987 * V2
i, 0.986 * V2
i, 0.979 * V2
i, 0.969 * V2
i, 0.964 * V2
i, 0.960 * V2
i, 0.958 * V2
i, 0.956 * V2
i, 0.956 * V2
i.
And stinging steel moment of torsion and throwing steel moment of torsion of each frame is set as respectively improving 1.5～7.1% and reduce by 1.1～6.5% than the steady torque in pipe, from each frame of the 1st to the 10th sting steel moment of torsion and throw steel moment of torsion as follows:
N1
i(Nm) be: 0.52,0.58,0.64,0.67,0.68,0.76,0.74,0.71,0.52,0.27.
N3
i(Nm) be: 0.50,0.55,0.61,0.63,0.64,0.64,0.66,0.66,0.50,0.25.
In final actual measurement pipe, the wall thickening amount of sizing is 0.65～0.7mm, the wall thickness incremental raio of head and the afterbody thick 0.25～0.30mm that reduces while not taking above-mentioned control step, so head of steel pipe, the axial walls thickness ununiformity extreme difference of middle part and afterbody is because having taked above-mentioned control step to reduce by 0.25～0.30mm, crop end loss overall length shortens to 1.1m (because the head and tail wall thickness inequality that rolling deformation operation produces before cannot be improved by sizing operation from 1.4m, so crop end length now cannot reach respectively in theoretical value 300mm of the present invention, if but the head and tail wall thickness inequality that can reduce the generation of rolling deformation operation still can reach theoretical value), lumber recovery improves 1.2%, successful.
The motor speed that adopts method of the present invention to carry out monitoring in real time and adjust in time abnormal frame subtracting the load of sizing production process, thereby the appearance of prevent piling steel, drawing the abnormal conditions such as steel, improved the inhomogeneous situation that thickens of the tube wall in pipe, reduce the probability of " interior six sides " defect appearance that thick-walled pipe occurs when total reducing rate >=10%, given full play to the capacity of equipment of each frame; In addition, the present invention changes according to the Motor torque of each frame, carry out electrical system detection, rate curve and assign, realize that speed regulates and 4 links such as result feedback, above step can complete in 150～160 milliseconds, the length that now head-tail of hollow forging subtracts sizing through frame controlled and thickened blind area below 300mm, and do not adopt at present when of the present invention, the length that head-tail subtracts sizing through frame controlled and thickened blind area more than 420mm.As can be seen here, the present invention can improve in the pipe of external diameter specification of total reducing rate >=10%, section, the axial walls thickness ununiformity of head-tail while subtracting sizing, steel tube head exceeds standard to cut and damages length and reduce more than 30% on current basis, and corresponding kind lumber recovery improves 0.8～1.5% on current basis.
Although above by having described the present invention in conjunction with exemplary embodiment, it will be apparent to those skilled in the art that in the situation that do not depart from the spirit and scope that claim limits, can carry out various modifications and change to exemplary embodiment of the present invention.
Claims (10)
1. one kind subtracts the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall, when hot hollow forging enters after i frame frame, automatically complete the sizing that subtracts of stinging steel, stablize and throwing steel and realize a passage, it is characterized in that, described method comprises inhomogeneous inhomogeneous the thickening of tube wall that thickens and/or control tube head, afterbody of the tube wall in control valve
Inhomogeneous the thickening specifically of tube wall in control valve comprises the following steps:
Subtract sizing and produce while starting, the motor speed of i frame frame is predetermined stabilized speed V2
i, the Motor torque of each frame is produced and observed to constant speed afterwards, by regulating the stabilized speed V2 of i frame frame
iguarantee the moment of torsion Na of i frame frame
ifor positive-torque and by regulating the stabilized speed V2 of i frame frame
iguarantee the moment of torsion Na of i frame frame after i-1 frame frame is thrown steel
isuitably reduce, wherein, i is positive integer and 1≤i≤n, and n is frame number and 3≤n≤32, a be 1,2,3 and 1,2,3 respectively representative sting steel stage, stabilization sub stage and throwing steel stage;
Control the inhomogeneous polishing that thickens equivalence backward pull when the polishing that comprises equivalence forward pull when carrying out head stings steel is controlled and afterbody throws steel of the tube wall of tube head, afterbody and control, specifically comprise the following steps:
When a, tube head subtract sizing production, the motor speed of i frame frame is predetermined biting speed V1
i, when i frame frame enters the stabilization sub stage from stinging the steel stage, control the stabilized speed V2 of i frame frame
i< biting speed V1
i, while starting through the outlet side of i frame frame from the head of hot hollow forging, what make i frame frame stings steel moment of torsion N1
ibe greater than steady torque N2
iin suffered tension force and pipe, suffered tension force is suitable when guaranteeing that hot waste tube head is stung steel;
When b, pipe afterbody subtract sizing production, the motor speed of i frame frame is predetermined stabilized speed V2
i, when i frame frame entered and throws steel during the stage from the stabilization sub stage, control the throwing steel speed V3 of i frame frame
i< stabilized speed V2
i, when the outlet side that departs from i-1 frame frame from the afterbody of hot hollow forging starts, make the throwing steel moment of torsion N3 of i frame frame
ibe less than steady torque N2
iin suffered tension force and pipe, suffered tension force is suitable when guaranteeing that hot hollow forging afterbody is thrown steel;
C, pipe afterbody subtract sizing to be thrown after steel, and the motor speed of i frame frame is predetermined throwing steel speed V3
i, when i+1 frame, throw after steel, control the biting speed V1 of i frame frame
i> throws steel speed V3
i,
Wherein, i is positive integer and 1≤i≤n, and n is frame number and 3≤n≤32.
2. the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts according to claim 1, is characterized in that, during inhomogeneous the thickening of tube wall in control valve, by regulating the stabilized speed V2 of i frame frame
iguarantee that i-1 frame frame throws the moment of torsion Na of i frame frame after steel
ilower by 0.1～8% than the steady torque in pipe.
3. the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts according to claim 1, is characterized in that, during inhomogeneous the thickening of tube wall in control valve, as the moment of torsion Na of i frame frame
iduring for negative torque, suitably improve the stabilized speed V2 of i frame frame
iand guarantee the moment of torsion Na of i frame frame
ifor on the occasion of.
4. the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts according to claim 1, is characterized in that, during inhomogeneous the thickening of tube wall in control valve, and the moment of torsion Na of i frame frame after i-1 frame frame is thrown steel
iwhile raising suddenly, suitably improve the stabilized speed V2 of i frame frame
i.
5. the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts according to claim 1, is characterized in that, during inhomogeneous the thickening of tube wall in control valve, and the moment of torsion Na of i frame frame after i-1 frame frame is thrown steel
iwhile reducing suddenly, suitably reduce the stabilized speed V2 of i frame frame
i.
6. the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts according to claim 1, is characterized in that, inhomogeneous the thickening of tube wall in control valve, as the moment of torsion Na of i frame frame
iwhile occurring that in the stabilization sub stage jump changes or positive negative value fluctuation changes, replacing i frame frame.
7. the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts according to claim 1, is characterized in that, from the head of hot hollow forging, through the outlet side of i frame frame, that controls i frame frame stings steel moment of torsion N1
ithan steady torque N2
ilarge 0.1～8%; The outlet side that departs from i-1 frame frame from the afterbody of hot hollow forging, control the throwing steel moment of torsion N3 of i frame frame
ithan steady torque N2
ilittle by 0.1～8%.
8. the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts according to claim 1, is characterized in that, when controlling inhomogeneous the thickening of tube wall of tube head, afterbody, in step a, when i+1 frame frame is with V1
i+1biting speed sting steel and i+1 frame frame detected sting steel moment of torsion N1
i+1after, control the motor speed of i frame frame from biting speed V1
ibe reduced to stabilized speed V2
imove and detect the steady torque N2 of i frame frame
iafter, complete the speed control that enters the stabilization sub stage from stinging the steel stage;
In step b, when i-1 frame frame is with V3
i-1throwing steel speed throw steel and the throwing steel moment of torsion N3 of i-1 frame frame detected
i-1after disappearance, control the motor speed of i frame frame from stabilized speed V2
ibe reduced to and throw steel speed V3
imove and detect the throwing steel moment of torsion N3 of i frame frame
iafter, complete from the stabilization sub stage to the speed control of throwing the steel stage;
In step c, when i+1 frame frame is with V3
i+1throwing steel speed throw steel and the throwing steel moment of torsion N3 of i+1 frame frame detected
i+1after disappearance, control the motor speed of i frame frame from throwing steel speed V3
ibe increased to biting speed V1
imove and wait for that next hot hollow forging enters i frame frame, complete the speed control of throwing the steel stage.
9. the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts according to claim 1, is characterized in that, when controlling inhomogeneous the thickening of tube wall of tube head, afterbody, and biting speed V1
ifor stabilized speed V2
i1.01～1.09 times, throw steel speed V3
ifor stabilized speed V2
i0.91～0.99 times, stabilized speed V2
ireal value of establishing of stabilized speed while deriving from inhomogeneous the thickening of tube wall in control valve.
10. the inhomogeneous method thickening of sizing production On-line Control seamless steel pipe tube wall that subtracts according to claim 1, is characterized in that steady torque N2
ibe 0.010～10.0Nm, sting steel moment of torsion N1
ibe 0.010～10.0Nm, throw steel moment of torsion N3
ibe 0.010～10.0Nm; Sting steel time t1
ibe 0.20～1.6s, stabilization time t2
ibe 0～60s, throw steel time t3
ibe 0.20～1.6s.
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| CN106238464A (en) * | 2016-08-03 | 2016-12-21 | 太原磬泓机电设备有限公司 | Oblique milling seamless steel pipe pipe end rolling method for sharpening |
| CN107774722A (en) * | 2016-08-31 | 2018-03-09 | 林州凤宝管业有限公司 | A kind of control method of stretch reducing machine CEC systems |
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