CN104084428B - Subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall - Google Patents
Subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall Download PDFInfo
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- CN104084428B CN104084428B CN201410257815.8A CN201410257815A CN104084428B CN 104084428 B CN104084428 B CN 104084428B CN 201410257815 A CN201410257815 A CN 201410257815A CN 104084428 B CN104084428 B CN 104084428B
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Abstract
The invention discloses and a kind ofly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, first the present invention carries out the on-line control of roller speed to each frame, eliminate in pipe the heap steel phenomenon subtracting sizing and exist, and belt tension subtracts sizing, improve the evenness of wall thickness in pipe, when increase subtract sizing total reducing rate, 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 when making the free head-tail of hot hollow forging subtract tension force suffered by sizing and subtract sizing in pipe is consistent, thus realize head-tail tube wall thickening and tube-in-tube wall thickening is basically identical, improve the axial evenness of wall thickness subtracting steel pipe after sizing, reduce termination and cut damage, improve Tube yield.
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 subtract the uneven method thickened of On-line Control seamless steel pipe tube wall in sizing production process at tension force.
Background technology
At present, the last operation of distortion together of hot rolled seamless steel tube production line is for subtracting sizing operation, as shown in Figure 1, its principle is: adopt n (frame number n is 3 ~ 32) frame frame tandem to arrange, the roll pass of every frame frame is made up of the roll that three are mutually 120 °, adjacent rack interlaced arrangement, to be separated by between any i-th and the pass larynx footpath of i+1 frame a frame spacing L, the hot hollow forging that rolling process is sent here enters any i-th frame, automatically complete and sting steel (instant heating hollow forging head end is through the pass of the i-th frame, from L between a frame of advancing, just to the process of the pass of the i-th+1 frame), (instant heating hollow forging tail end leaves the pass of the i-th-1 frame for stable (subtracting Sizing Process beyond steel except stinging steel and throwing) and throwing steel, advance a frame spacing L, leave the process of the pass of the i-th frame) three subtract Sizing Process, when hot hollow forging end to end successively through 1, 2 ... after the pass of n frame frame, what just complete n passage subtracts sizing distortion (thickening or subtracting thick along with tube wall), hollow forging finally becomes the seamless steel pipe that user requires size.
As shown in Figure 1, when i-th-2, between i-1, i and i+1 tetra-frames, (without hollow forging in other frame of front and back) all stings steel to hot hollow forging, to each breast roller roll surface speed difference, each roll surface of each frame gives an axially pulling force of hot hollow forging to the normal pressure of hot hollow forging and friction synergy, wherein the i-th-1 frame is to the backward pull Fb of the axial tension of the i-th frame on the i-th frame
i(b represents backward), the i-th+1 frame is to the forward pull Fa of the axial tension of the i-th frame on the i-th frame
i(a represents forward), i-th-1 and i frame in hot hollow forging act on by while forward pull and backward pull respectively, and hot hollow forging in i-th-2 last frame is only by forward pull Fa
i-2act on and lack backward pull Fb
i-2, the hot hollow forging in the i-th+1 the most previous frame is only by backward pull Fb
i+1act on and lack forward pull Fa
i+1, tension force suffered when therefore causing pipe and intermediate tube end to end to subtract sizing is different.In addition, in the requirement subtracting control valve wall thickening in fixed diameter process be: the backward pull Fb of the i-th frame
iwith forward pull Fa
ilarge as far as possible, the metal then subtracting hot hollow forging during sizing is larger along the pulling force of pipe axis, metal is easier in pipe axial flow, the uneven trend thickened of the tube wall of pipe circumference is less, otherwise subtracts the uneven amount of swelling of sizing tube wall and cause greatly steel pipe section and axial walls to increase inequality seriously to exceed Steel tube standard requirement and become waste product.Meanwhile, making steel pipe section consistent with tube axial wall thickening is as far as possible the basic demand subtracting fixed diameter process control valve wall thickening.
At present, reducing sizing mill online production hot rolled seamless steel tube mainly comprises following problem:
1) such as: 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 then subtracting each frame in sizing production process is constant, on-line tuning roll speed cannot be changed according to production process, therefore there is heap steel between frame produce and cause that the tube wall section in pipe is uneven to be thickened serious and exceed the problem that Steel tube standard requires, especially when total reducing rate >=22%, during outer diameter D/wall thickness S≤10, very easily there is the mass defect of " interior six sides " and make steel pipe become waste product,
2) all only there is backward pull Fb through each frame in hot waste tube head
iand lack forward pull Fa
i, on the contrary, all only there is forward pull Fa through each frame in hot hollow forging afterbody
iand lack backward pull Fb
i, then there is forward pull Fa through each frame in the middle part of hot hollow forging simultaneously
iwith backward pull Fb
i, this make the head of hot hollow forging and afterbody the tension force subtracting sizing through each frame little with pipe in subtract the tension force of sizing through each frame different.Therefore head and afterbody more than the tube wall thickening in pipe, cause the axial walls thickness ununiformity of steel pipe serious, increase and cutting useless loss end to end, affect Tube yield.
Summary of the invention
For deficiency of the prior art, what the object of the invention is in solving the problems of the technologies described above is one or more.
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, on-line tuning roll speed cannot be changed according to production process, make to exist between frame heap steel produce and cause pipe to interrupt facial canal wall is uneven thickens and exceed Steel tube standard requirement, produce " interior six sides " mass defect time serious and make steel pipe become waste product; 2) when sizing being subtracted to the waste tube head of heat, afterbody, because free head lacks forward pull and free afterbody lacks backward pull, make head, the tube wall thickening of afterbody exceedes tube wall thickening in pipe, 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 and a kind ofly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, after hot hollow forging enters the i-th frame frame, automatically complete sting steel, stable and throw steel and realize a passage subtract sizing, described method comprises that tube wall in control valve unevenly thickens and/or control tube head, the tube wall of afterbody unevenly thickens
Uneven the thickening of tube wall in control valve specifically comprises the following steps: when subtracting sizing production beginning, the motor speed of the i-th frame frame is predetermined stabilized speed V2
i, constant speed is produced and is observed the Motor torque of each frame afterwards, by regulating the stabilized speed V2 of the i-th frame frame
iensure the moment of torsion Na of the i-th frame frame
ifor positive-torque and by the stabilized speed V2 of adjustment i-th frame frame
iensure the moment of torsion Na of the i-th frame frame after the i-th-1 frame frame throws steel
isuitable reduction, wherein, i is positive integer and 1≤i≤n, n is frame number and 3≤n≤32, a is 1,2,3 and 1,2,3 respectively representative sting steel stage, stabilization sub stage and throwing steel stage;
Control tube head, afterbody tube wall uneven thicken comprise the polishing carrying out equivalence forward pull when head stings steel control and afterbody throws steel time equivalence backward pull polishing control, specifically comprise the following steps: when a, tube head subtract sizing production, the motor speed of the i-th frame frame is predetermined biting speed V1
i, when the i-th frame frame from sting the steel stage enter the stabilization sub stage time, control the stabilized speed V2 of the i-th frame frame
i< biting speed V1
i, time from the head of hot hollow forging passes the outlet side of the i-th frame frame, what make the i-th frame frame stings steel moment of torsion N1
ibe greater than steady torque N2
iduring to ensure that hot waste tube head stings steel, in suffered tension force and pipe, suffered tension force is suitable; When b, pipe afterbody subtract sizing production, the motor speed of the i-th frame frame is predetermined stabilized speed V2
i, when the i-th frame frame enters the throwing steel stage from the stabilization sub stage, control the throwing steel speed V3 of the i-th frame frame
i< stabilized speed V2
i, time from the afterbody of hot hollow forging departs from the outlet side of the i-th-1 frame frame, make the throwing steel moment of torsion N3 of the i-th frame frame
ibe less than steady torque N2
iduring to ensure that hot hollow forging afterbody throws steel in suffered tension force and pipe suffered by tension force suitable; After c, pipe afterbody subtract sizing throwing steel, the motor speed of the i-th frame frame is predetermined throwing steel speed V3
i, after steel thrown by the i-th+1 frame, control the biting speed V1 of the i-th 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 the embodiment subtracting the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall of the present invention, the tube wall in control valve is uneven when thickening, by regulating the stabilized speed V2 of the i-th frame frame
ithe moment of torsion Na of the i-th frame frame after guarantee i-th-1 frame frame throwing steel
ilower than the steady torque in pipe by 0.1 ~ 8%.
According to the embodiment subtracting the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall of the present invention, the tube wall in control valve is uneven when thickening, as the moment of torsion Na of the i-th frame frame
iduring for negative torque, suitably improve the stabilized speed V2 of the i-th frame frame
iand guarantee the moment of torsion Na of the i-th frame frame
ifor on the occasion of.
According to the embodiment subtracting the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall of the present invention, the tube wall in control valve is uneven when thickening, the moment of torsion Na of the i-th frame frame after the i-th-1 frame frame throws steel
iduring unexpected rising, suitably improve the stabilized speed V2 of the i-th frame frame
i.
According to the embodiment subtracting the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall of the present invention, the tube wall in control valve is uneven when thickening, the moment of torsion Na of the i-th frame frame after the i-th-1 frame frame throws steel
iduring unexpected reduction, suitably reduce the stabilized speed V2 of the i-th frame frame
i.
According to the embodiment subtracting the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall of the present invention, the tube wall in control valve is uneven when thickening, as the moment of torsion Na of the i-th frame frame
iwhen occurring jumping change or positive and negative values fluctuation change in the stabilization sub stage, change the i-th frame frame.
According to the embodiment subtracting the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall of the present invention, from the head of hot hollow forging passes the outlet side of the i-th frame frame, what control the i-th frame frame stings steel moment of torsion N1
ithan steady torque N2
ilarge 0.1 ~ 8%; From the afterbody of hot hollow forging departs from the outlet side of the i-th-1 frame frame, control the throwing steel moment of torsion N3 of the i-th frame frame
ithan steady torque N2
ilittle by 0.1 ~ 8%.
According to the embodiment subtracting the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall of the present invention, control tube head, afterbody tube wall uneven thicken time, in step a, when the i-th+1 frame frame is with V1
i+1biting speed sting steel and the i-th+1 frame frame detected sting steel moment of torsion N1
i+1after, control the motor speed of the i-th frame frame from biting speed V1
ibe reduced to stabilized speed V2
irun and the steady torque N2 of the i-th frame frame detected
iafter, complete the speeds control from stinging the steel stage and enter the stabilization sub stage; In stepb, when the i-th-1 frame frame is with V3
i-1throwing steel speed throw steel and the throwing steel moment of torsion N3 of the i-th-1 frame frame detected
i-1after disappearance, control the motor speed of the i-th frame frame from stabilized speed V2
ibe reduced to and throw steel speed V3
irun and the throwing steel moment of torsion N3 of the i-th frame frame detected
iafter, complete from the stabilization sub stage to the speeds control throwing the steel stage; In step c, when the i-th+1 frame frame is with V3
i+1throwing steel speed throw steel and the throwing steel moment of torsion N3 of the i-th+1 frame frame detected
i+1after disappearance, control the motor speed of the i-th frame frame from throwing steel speed V3
ibe increased to biting speed V1
irun and wait for that next hot hollow forging enters the i-th frame frame, completing the speeds control throwing the steel stage.
According to the embodiment subtracting the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall of the present invention, control tube head, afterbody tube wall uneven thicken time, 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
iderive from that stabilized speed when tube wall in control valve is uneven to be thickened is real establishes value.
According to the embodiment subtracting the uneven method thickened 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 (i.e. motor speed) to each frame, eliminate in pipe the heap steel phenomenon subtracting sizing and exist, and belt tension subtracts sizing, improve the evenness of wall thickness in pipe, when increase subtract sizing total reducing rate, 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 when making hot hollow forging head-tail subtract tension force suffered by sizing and subtract sizing in pipe is consistent, thus realize head-tail tube wall thickening and tube-in-tube wall thickening is basically identical, improve the axial evenness of wall thickness subtracting steel pipe after sizing, reduce termination and cut damage, improve Tube yield.
Accompanying drawing explanation
Fig. 1 is the layout of existing reducing sizing mill roll stand and stressed schematic diagram.
The real electrical machinery speed versus time figure of Fig. 2 each frame when to be that the tube wall in the control valve of exemplary embodiment of the present is uneven thicken.
The real electrical machinery torsion-time figure of Fig. 3 each frame when to be that the tube wall in the control valve of exemplary embodiment of the present is uneven thicken.
The real electrical machinery speed versus time figure of each frame that Fig. 4 is the control head of exemplary embodiment of the present, the tube wall of afterbody is uneven when thickening.
The real electrical machinery torsion-time figure of each frame that Fig. 5 is the control head of exemplary embodiment of the present, the tube wall of afterbody is uneven when thickening.
The torsion-time figure of the first abnormal conditions is there is in Fig. 6 when to be that the tube wall in the control valve of exemplary embodiment of the present is uneven thicken.
The torsion-time figure of the second abnormal conditions is there is in Fig. 7 when to be that the tube wall in the control valve of exemplary embodiment of the present is uneven thicken.
The torsion-time figure of the third abnormal conditions is there is in Fig. 8 when to be that the tube wall in the control valve of exemplary embodiment of the present is uneven thicken.
The torsion-time figure of the 4th kind of abnormal conditions is there is in Fig. 9 when to be that the tube wall in the control valve of exemplary embodiment of the present is uneven thicken.
The torsion-time figure of the 5th kind of abnormal conditions is there is in Figure 10 when to be that the tube wall in the control valve of exemplary embodiment of the present is uneven thicken.
Illustrate:
The hot hollow forging of 1-frame, 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 forward pull and backward pull suffered by hot hollow forging.
Detailed description of the invention
Hereinafter, the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall is subtracted by of the present invention for detailed description.
Mainly there are following two technical problems: 1) motor speed of each frame is constant owing to subtracting in prior art when sizing is produced, the roll speed of each frame of on-line tuning cannot be changed according to production process, cause existing between frame piling steel and causing uneven the thickening of section tube wall in pipe and exceed Steel tube standard requirement, produce " interior six sides " mass defect time serious and make steel pipe become waste product; 2) when sizing being subtracted to the waste tube head of heat, afterbody, because free head lacks forward pull and free afterbody lacks backward pull, make the tube wall thickening of head-tail exceed tube wall thickening in pipe, 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 mainly have employed following technological means and thickens to control the uneven of seamless steel pipe tube wall: thicken for the tube wall in pipe is uneven, adopt the mode of on-line control roller speed, the heap steel phenomenon existed during to eliminate in pipe and to subtract sizing, and belt tension subtracts sizing, thus improve that tube wall in pipe is uneven to be thickened; Tube wall for tube head, afterbody is uneven to be thickened, by increasing the additional tension of head, afterbody, by the tension force polishing of head, afterbody disappearance, to make in tension force suffered by hot waste tube head, afterbody and pipe suffered tension force quite, thus improve head, the tube wall of afterbody unevenly thickens.
The control device of above-mentioned two aspects both can be carried out simultaneously, and also can carry out respectively targetedly for practical condition, 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, namely first uneven the thickening of the tube wall in pipe is controlled, again uneven the thickening of the tube wall of tube head, afterbody is controlled, below the control mode of two aspect control devices and principle are specifically described.
First, the divided stages subtracting sizing production process is described.Usually, the Sizing Process that subtracts of each frame is divided into and stings steel, stable and throw steel three phases, and particularly, the steel stage of stinging of the i-th frame frame refers to the pass larynx footpath of head through the i-th frame frame of hot hollow forging, advance a frame spacing L, just to the process in the pass larynx footpath of the i-th+1 frame frame; Stabilization sub stage of the i-th frame frame refers to the pass larynx footpath from the head of hot hollow forging to the i-th+1 frame frame, the afterbody to hot hollow forging has just left the process the pass larynx footpath of the i-th-1 frame frame; Throwing steel stage of the i-th frame frame refers to that footpath shouted by the pass that the afterbody of hot hollow forging leaves the i-th-1 frame frame, and advance a frame spacing L, and the process in footpath shouted by the pass leaving the i-th frame frame, and the rest may be inferred for all the other each framves.After hot hollow forging enters the i-th frame frame, automatically complete sting steel, stable and throw steel and realize a passage subtract sizing, through n frame subtract sizing processing after, hot hollow forging becomes the seamless steel pipe product met the requirements of the customers.Wherein, i is positive integer and 1≤i≤n, n is frame number and 3≤n≤32, and also namely frame number n can get any integer value in 3 ~ 32; As i=1 or i=n, the 0th frame and the (n+1)th frame are virtual frame, and reality does not exist.
Secondly, the controling parameters subtracting sizing production process is described.Controling parameters 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 the i-th frame is expressed as V2
i, the biting speed of the i-th frame is expressed as V1
i, the throwing steel speed of the i-th frame is expressed as V3
i; The stabilization time of the i-th frame is expressed as t2
i, the steel time representation of stinging of the i-th frame is t1
i, the throwing steel time representation of the i-th frame is t3
i; The steady torque of the i-th frame is expressed as N2
i, the steel moment of torsion of stinging of the i-th frame is expressed as N1
i, the throwing steel moment of torsion of the i-th frame is expressed as N3
i, the moment of torsion of the i-th frame can be collectively expressed as Na
i, wherein, a is 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 at below 20ms.
Comprise the following steps according to uneven the thickening of the tube wall in control valve of the present invention: when subtracting sizing production beginning, the motor speed of the i-th frame frame is predetermined stabilized speed V2
i, constant speed is produced and is observed the Motor torque of each frame afterwards, by regulating the stabilized speed V2 of the i-th frame frame
iensure the moment of torsion Na of the i-th frame frame
ifor positive-torque and by the stabilized speed V2 of adjustment i-th frame frame
iensure the moment of torsion Na of the i-th frame frame after the i-th-1 frame frame throws steel
isuitable reduction.
Particularly, according to the present invention, subtracting in sizing production process, above-mentioned predetermined stabilized speed V2
ifor technologists is given, set in the man-machine picture of control system by operating personnel, the motor of each frame is with above-mentioned predetermined stabilized speed V2 afterwards
irun.All have hollow forging in pass due to frame before and after when subtracting sizing in pipe, tube wall thickening affects by front and back interstand tension, therefore needs the unusual condition according to tube-in-tube wall thickening inequality in process of production, adjusts the stabilized speed V2 of each frame
i, the tube-in-tube wall of each frame of control is uneven indirectly thickens, thus reaches the object improving evenness of wall thickness in pipe, reduces " interior six sides " mass defect occurrence probability.The unusual condition of above-mentioned tube-in-tube wall thickening inequality is mainly through 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 the i-th frame frame
ifor positive-torque; 2) as the moment of torsion Na of the i-th frame frame after the i-th-1 frame frame throwing steel
isuitable reduction.Wherein, described suitable reduction refers to the mild decline in suitable amplitude, and the reduction such as rapid drawdown or bust mode does not belong in the scope of suitably reduction.According to the present invention, by regulating the stabilized speed V2 of the i-th frame frame
ithe moment of torsion Na of the i-th frame frame after guarantee i-th-1 frame frame throwing steel
ilower than the steady torque in pipe by 0.1 ~ 8%.
The real electrical machinery speed versus time figure of Fig. 2 each frame when to be that the tube wall in the control valve of exemplary embodiment of the present is uneven thicken, is constant and does not change in time subtracting in Sizing Process after the motor speed of each frame is set by operating personnel.The real electrical machinery torsion-time figure of Fig. 3 each frame when to be that the tube wall in the control valve of exemplary embodiment of the present is uneven thicken, as can be seen from Fig. 2 and Fig. 3, after i-th-1 frame frame throws steel, the moment of torsion of the i-th frame frame has compared obvious reduction with steel moment of torsion of stinging before with steady torque.
Fig. 6 to Figure 10 shows the torsion-time figure not meeting five kinds of abnormal conditions of above-mentioned requirements occurred when tube wall in the control valve of exemplary embodiment of the present is uneven to be thickened, and then can know 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 torsion-time figure.
As shown in Figure 6, when the tension force of adjacent two frame frames is negative, shows as this frame and occur negative torque, then think that the hot hollow forging in a upper frame is pushing away the hot hollow forging production in this frame, thus the hot hollow forging in this frame is caused to occur seriously piling steel, now by suitably improving the stabilized speed V2 of this frame
isolve, namely as the moment of torsion Na of the i-th frame frame
iduring for negative torque, suitably improve the stabilized speed V2 of the i-th frame frame
iand guarantee the moment of torsion Na of the i-th frame frame
ifor on the occasion of.Wherein, the stabilized speed V2 of the i-th frame frame
iincrease rate need determine according to the concrete condition of production in production scene, such as, rule of thumb adjusting range≤+ 10%V2
i.
As shown in Figure 7, when the tension force of adjacent two frame frames is too small, after showing as a frame throwing steel, this frame moment of torsion raises suddenly, and this can cause the hot hollow forging in this frame to occur slightly piling steel, now by suitably improving the stabilized speed V2 of this frame
isolve, namely as the moment of torsion Na of the i-th frame frame after the i-th-1 frame frame throwing steel
iduring unexpected rising, suitably improve the stabilized speed V2 of the i-th frame frame
i.Similarly, the stabilized speed V2 of now the i-th frame frame
iincrease rate need determine according to the concrete condition of production in production scene, such as, rule of thumb adjusting range≤+ 10%V2
i.
As shown in Figure 8, when the overtension of adjacent two frame frames, after showing as a frame throwing 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, namely as the moment of torsion Na of the i-th frame frame after the i-th-1 frame frame throwing steel
iduring unexpected reduction, suitably reduce the stabilized speed V2 of the i-th frame frame
i.Similarly, the stabilized speed V2 of now the i-th frame frame
ireduction amplitude need determine according to the concrete condition of production in production scene, such as, rule of thumb adjusting range≤10%V2
i.
As shown in Figure 9 and Figure 10, when jump change or positive and negative values fluctuation change appear in the moment of torsion of certain frame in the stabilization sub stage, overtension then in this frame occurs drawing steel or tension force too small appearance heap steel, now judge it is because the roll surface of this frame is aging or wear and tear and excessively cause caused by frictional force reduces, solve by changing this frame in time, namely as the Na of the i-th frame frame
iwhen occurring jumping change or positive and negative values fluctuation change in the stabilization sub stage, change the i-th frame frame.
The tube wall of control tube head of the present invention, afterbody is uneven thicken the polishing mainly carrying out equivalence forward pull when head stings steel control and afterbody throws steel time equivalence backward pull polishing control, specifically comprise the following steps:
When a, tube head subtract sizing production, the motor speed of the i-th frame frame is predetermined biting speed V1
i, when the i-th frame frame from sting the steel stage enter the stabilization sub stage time, control the stabilized speed V2 of the i-th frame frame
i< biting speed V1
i, time from the head of hot hollow forging passes the outlet side of the i-th frame frame, what make the i-th frame frame stings steel moment of torsion N1
ibe greater than steady torque N2
iduring to ensure that hot waste tube head stings steel, in suffered tension force and pipe, suffered tension force is suitable;
When b, pipe afterbody subtract sizing production, the motor speed of the i-th frame frame is predetermined stabilized speed V2
i, when the i-th frame frame enters the throwing steel stage from the stabilization sub stage, control the throwing steel speed V3 of the i-th frame frame
i< stabilized speed V2
i, time from the afterbody of hot hollow forging departs from the outlet side of the i-th-1 frame frame, make the throwing steel moment of torsion N3 of the i-th frame frame
ibe less than steady torque N2
iduring to ensure that hot hollow forging afterbody throws steel in suffered tension force and pipe suffered by tension force suitable;
After c, pipe afterbody subtract sizing throwing steel, the motor speed of the i-th frame frame is predetermined throwing steel speed V3
i, after steel thrown by the i-th+1 frame, control the biting speed V1 of the i-th 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 in order to solve tube head, afterbody tube wall is uneven thickens the quality problems caused, the polishing control of equivalence backward pull when the polishing proposing equivalence forward pull when hot waste tube head stings steel controls and hot hollow forging afterbody throws steel, namely apply an axis when subtracting sizing processing at the waste tube head of heat, afterbody and add pulling force, force metal longitudinal flow, the tube wall thickening of restriction head, afterbody.And above-mentioned axis add pulling force be by adjacent rack between certain linear speed difference realize, be specially and control biting speed V1
iwith throwing steel speed V3
irealize, namely by setting the V1 of each frame on the man-machine picture of control system respectively
iand V3
ivalue has been come, and makes torque curve meet the requirements afterwards, and whether reasonably whether torque curve meets the requirements is speeds control final inspection and judgement.
When hot hollow forging is through each frame, the three phases of above-mentioned steps a to c is divided into control motor speed change, indirectly make the metal flow on hot hollow forging flow according to technological requirement, reach the object of control head, afterbody tube wall thickening, the motor speed of above-mentioned three phases controls as follows:
1) speeds control that the steel stage enters the stabilization sub stage is stung: in step a, when the i-th+1 frame frame is with V1
i+1biting speed sting steel and the i-th+1 frame frame detected sting steel moment of torsion N1
i+1after, control the motor speed of the i-th frame frame from biting speed V1
ibe reduced to stabilized speed V2
irun and the steady torque N2 of the i-th frame frame detected
iafter, complete the speeds control from stinging the steel stage and enter the stabilization sub stage.The rest may be inferred for all the other each frames, namely meets the biting speed V1 of each frame
i> stabilized speed V2
i.
2) stabilization sub stage enters the speeds control throwing the steel stage: in stepb, when the i-th-1 frame frame is with V3
i-1throwing steel speed throw steel and the throwing steel moment of torsion N3 of the i-th-1 frame frame detected
i-1after disappearance, control the motor speed of the i-th frame frame from stabilized speed V2
ibe reduced to and throw steel speed V3
irun and the throwing steel moment of torsion N3 of the i-th frame frame detected
iafter, complete from the stabilization sub stage to the speeds control throwing the steel stage.The rest may be inferred for all the other each frames, namely meets the stabilized speed V2 of each frame
i> throws steel speed V3
i.
3) the throwing steel stage enters the speeds control stinging the steel stage: in step c, when the i-th+1 frame frame is with V3
i+1throwing steel speed throw steel and the throwing steel moment of torsion N3 of the i-th+1 frame frame detected
i+1after disappearance, control the motor speed of the i-th frame frame from throwing steel speed V3
ibe increased to biting speed V1
irun and wait for that next hot hollow forging enters the i-th frame frame, completing from the throwing steel stage to the speeds control stinging the steel stage.The rest may be inferred for all the other each frames, namely meets the biting speed V1 of each frame
i> throws steel speed V3
i.
Above-mentioned three speeds control stages circulate successively, thus complete the speeds control that each hot hollow forging subtracts sizing, wherein the real electrical machinery speed versus time figure 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 the i-th frame frame, once subtracting in Sizing Process, have passed through V1
iheight → V2
i→ V3 falls
itwice reduction of speed falls, finally again raising speed to V1
ispeed, repeats next root hollow forging and produces.Wherein, stabilized speed V2
iderive from that stabilized speed when tube wall in control valve is uneven to be thickened is real establishes value (revising afterwards), 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, during owing to stinging steel, the free head of hot hollow forging really cannot set up forward pull Fa
i, can only by increasing biting speed V1
i, when making the i-th frame frame sting steel, the backward pull of head reality is than the backward pull Fb in pipe
igreatly, the forward pull Fa in its difference equivalent-effect transistor increased
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 when subtracting sizing in this and pipe, hot hollow forging is subject to
i+ Fa
i) size is the same, head is just the same with the size of wall thickening in pipe, axial wall thickness ununiformity between in minimizing head and pipe.For reaching this purpose, require that the head of hot hollow forging starts through the outlet side of the i-th frame frame, what control the i-th frame frame stings steel moment of torsion N1
ibe greater than steady torque N2
iduring to ensure that hot waste tube head stings steel, in suffered tension force and pipe, suffered tension force is suitable.Also namely the i-th 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-th frame frame
ito the effect of tube wall thickening.
According to the present invention, during owing to throwing steel, the free afterbody of hot hollow forging cannot really set up backward pull Fb
i, can only by reducing to throw steel speed V3
i, when making the i-th frame frame throw steel, the forward pull of afterbody reality is than the forward pull Fa in pipe
igreatly, the backward pull Fb in its difference equivalent-effect transistor increased
i,, the tension force that when now afterbody subtracts sizing, hollow forging is subject to is equivalent Fb
i+ Fa
iwith the tension force Fb that hot hollow forging when subtracting sizing in pipe is subject to
i+ Fa
isize is the same, and afterbody is just the same with the size of wall thickening in pipe, axial wall thickness ununiformity between reducing in afterbody and pipe.For reaching this purpose, require that the afterbody of hot hollow forging departs from the outlet side of the i-th-1 frame frame and starts, suffered by the throwing steel moment of torsion N3i controlling the i-th frame frame to be less than when steady torque N2i throws steel to ensure hot hollow forging afterbody in suffered tension force and pipe, tension force is suitable.Also the moment of torsion difference that namely the throwing steel moment of torsion N3i of the i-th frame frame is less than steady torque N2i is equivalent to the backward pull Fbi of stabilization sub stage i-th frame frame to the effect of tube wall thickening.
Fig. 5 shows the actual torque-time diagram of each frame in above-mentioned rate-determining steps of exemplary embodiment of the present, as seen from Figure 5, after the i-th frame frame stings steel, in the i-th-1 frame frame from V1
i-1reduction of speed is to V2
i-1under effect, the i-th frame frame draws the i-th-1 frame frame by hot hollow forging, between two frames, produce Fb
i+ equivalent Fa
itension force, what cause the i-th frame frame stings steel moment of torsion N1
ihigher than the steady torque N2 in its pipe
i, subtract in the pipe of the i-th-1 frame frame sizing torque ratio its to sting steel moment of torsion low.In like manner, after the i-th-1 frame frame throws steel, in the i-th frame frame from V2
ireduction of speed is to V3
iunder effect, the i-th+1 frame frame draws the i-th frame frame by hot hollow forging, between two frames, produce equivalent Fb
i+ Fa
itension force, cause the throwing steel moment of torsion N3 of the i-th frame frame
ilower than the steady torque N2 in its pipe
i, in the pipe of the i-th+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 passes the outlet side of the i-th frame frame, what control the i-th frame frame stings steel moment of torsion N1
ithan steady torque N2
ilarge 0.1 ~ 8%; From the afterbody of hot hollow forging departs from the outlet side of the i-th-1 frame frame, control the throwing steel moment of torsion N3 of the i-th frame frame
ithan steady torque N2
ilittle by 0.1 ~ 8%.According to field experience, the steel pipe of this value to each specification has an optimum value, samples and measures the even degree size thickened of wall unevenness in the head of steel pipe, afterbody and pipe, carry out on-the-spot real-time correction after needing basis to subtract sizing to hot hollow forging.If unconfined increase tension force, hot hollow forging may be broken or more than the frictional force between two frames, make to skid between hot hollow forging and roller.
In addition, of the present invention subtract sizing produce in, control 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; Steel time t1 is stung in control
ibe 0.20 ~ 1.6s, stabilization time t2
ibe 0 ~ 60s, throw steel time t3
ibe 0.20 ~ 1.6s.Above parameter can also adjust according to actual condition, the present invention is not limited thereto.
The present invention is further illustrated below in conjunction with concrete example.
This example is that production specification is the BNS pipe of φ 168.3 × 10.97 on the 12 frame sizing mills of climbing into steel 340 Continuous mill train, specifically comprises the following steps:
Sizing deformation program: the external diameter of the external diameter of the hot hollow forging of entrance to be the external diameter of φ 226mm → outlet thermo-optical pipe be φ 169.81mm → cold rear steel pipe is φ 168.3mm, and total reducing rate is 24.8%.
Design Sizing Pass series: can distortion be completed by 10 frames, the maximum reducing rate of single rack is 3.3%, and each frame pass diameter (mm) from the 1st frame to the 10th frame is followed successively by: 222.28,214.95,207.86,201.02,194.41,188.02,181.85,176.05,171.81,169.81.
The V2 of each frame of first theory calculate
ivalue, by the V2 of each frame during production
ivalue is set on the human-machine operation picture of sizing mill, carries out producing as a trial and observes the torque value of each frame, finds that the 1st frame frame has negative torque, then improve the speed of the 1st frame frame, until be on the occasion of, the control method of other frame is the same, finally from the 1st frame to each frame stabilized speed V2 of the 10th frame
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, not there is negative torque in each frame, and throw after steel in the i-th-1 frame frame, the moment of torsion of the i-th frame frame has the reduction of 0.1 ~ 3%, is with Minimal Tension, stablizes footpath and meet theory calls of the present invention in pipe when sizing in pipe is described between each frame.
Afterwards, in actual measurement pipe, sizing wall thickening amount is 0.65 ~ 0.7mm, the head of pipe thickens 0.50 ~ 0.55mm than in pipe more, the afterbody of pipe thickens 0.4 ~ 0.45mm than in pipe more, therefore the axial walls thickness ununiformity of the head of steel pipe, middle part and afterbody is caused, only because the wall thickness extreme difference of sizing operation impact reaches more than 0.5mm, crop end loss always reaches more than 1.4m.
Therefore, at the tension force polishing that head and the afterbody of hot hollow forging adopt trapezoidal speed to lack.The biting speed V1 of each frame is set respectively at man-machine picture
iwith throwing steel speed V3
i, first observe after the i-th frame frame stings steel, the moment of torsion N1 of the i-th frame frame
iwhether be increased to higher than N2
iabout 5% (first by 5% coarse adjustment, be no more than maximum empirical value 8%), if be not raised to position, then improve the V1 of the i-th frame frame successively
ispeed, until N1i meets the demands.After observing the i-th-1 frame frame throwing steel again, the moment of torsion N3 of the i-th frame frame
iwhether be reduced to lower than N2
iabout 5% (first by 5% coarse adjustment, be no more than maximum empirical value 8%), if do not drop to position, reduce the V3 of the i-th frame frame successively
ispeed, until meet N3
imeet the demands.Wherein, from the 1st frame to the biting speed V1 of each frame of the 10th frame
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.
Further, stinging steel moment of torsion and throwing steel moment of torsion of each frame is set as improving 1.5 ~ 7.1% and reduce by 1.1 ~ 6.5% than the steady torque in pipe respectively, from the 1st frame to each frame of the 10th frame 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 afterbody does not take to reduce during above-mentioned rate-determining steps thick 0.25 ~ 0.30mm, therefore the head of steel pipe, the axial walls thickness ununiformity extreme difference of middle part and afterbody decreases 0.25 ~ 0.30mm because taking above-mentioned rate-determining steps, 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, therefore within crop end length now cannot reach theoretical value 300mm of the present invention respectively, 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.
Method of the present invention is adopted to carry out monitoring in real time to the load subtracting sizing production process and adjust the motor speed of abnormal frame in time, thus prevent from piling steel, drawing the appearance of the abnormal conditions such as steel, improve that tube wall in pipe is uneven thickens situation, reduce the probability of " interior six sides " defect appearance that the thick-walled pipe when total reducing rate >=10% occurs, give 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 is assigned, realize 4 links such as speed adjustment and result feedback, above step can complete in 150 ~ 160 milliseconds, namely the length that now head-tail of hollow forging subtracts sizing through frame control to thicken blind area at below 300mm, and when not adopting of the present invention at present, namely the length that head-tail subtracts sizing through frame control to thicken blind area at more than 420mm.As can be seen here, section, axial walls thickness ununiformity when the present invention can improve in the pipe of the external diameter specification of total reducing rate >=10%, head-tail subtracts sizing, steel tube head exceed standard cut damage length on current basis, reduces more than 30%, correspondence kind lumber recovery on current basis, improve 0.8 ~ 1.5%.
Although above by describing the present invention in conjunction with exemplary embodiment, it will be apparent to those skilled in the art that when not departing from the spirit and scope that claim limits, various amendment and change can be carried out to exemplary embodiment of the present invention.
Claims (10)
1. one kind subtracts the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, after hot hollow forging enters the i-th frame frame, automatically complete sting steel, stable and throw steel and realize a passage subtract sizing, it is characterized in that, described method comprises that tube wall in control valve unevenly thickens and/or control tube head, the tube wall of afterbody unevenly thickens
Uneven the thickening of tube wall in control valve specifically comprises the following steps:
When subtracting sizing production beginning, the motor speed of the i-th frame frame is predetermined stabilized speed V2
i, constant speed is produced and is observed the Motor torque of each frame afterwards, by regulating the stabilized speed V2 of the i-th frame frame
iensure the moment of torsion Na of the i-th frame frame
ifor positive-torque and by the stabilized speed V2 of adjustment i-th frame frame
iensure the moment of torsion Na of the i-th frame frame after the i-th-1 frame frame throws steel
isuitable reduction, wherein, i is positive integer and 1≤i≤n, n is frame number and 3≤n≤32, a is 1,2,3 and 1,2,3 respectively representative sting steel stage, stabilization sub stage and throwing steel stage;
Control tube head, afterbody tube wall uneven thicken comprise the polishing carrying out equivalence forward pull when head stings steel control and afterbody throws steel time equivalence backward pull polishing control, specifically comprise the following steps:
When a, tube head subtract sizing production, the motor speed of the i-th frame frame is predetermined biting speed V1
i, when the i-th frame frame from sting the steel stage enter the stabilization sub stage time, control the stabilized speed V2 of the i-th frame frame
i< biting speed V1
i, time from the head of hot hollow forging passes the outlet side of the i-th frame frame, what make the i-th frame frame stings steel moment of torsion N1
ibe greater than steady torque N2
iduring to ensure that hot waste tube head stings steel, in suffered tension force and pipe, suffered tension force is suitable;
When b, pipe afterbody subtract sizing production, the motor speed of the i-th frame frame is predetermined stabilized speed V2
i, when the i-th frame frame enters the throwing steel stage from the stabilization sub stage, control the throwing steel speed V3 of the i-th frame frame
i< stabilized speed V2
i, time from the afterbody of hot hollow forging departs from the outlet side of the i-th-1 frame frame, make the throwing steel moment of torsion N3 of the i-th frame frame
ibe less than steady torque N2
iduring to ensure that hot hollow forging afterbody throws steel in suffered tension force and pipe suffered by tension force suitable;
After c, pipe afterbody subtract sizing throwing steel, the motor speed of the i-th frame frame is predetermined throwing steel speed V3
i, after steel thrown by the i-th+1 frame, control the biting speed V1 of the i-th 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.
2. according to claim 1ly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, it is characterized in that, the tube wall in control valve is uneven when thickening, by regulating the stabilized speed V2 of the i-th frame frame
ithe moment of torsion Na of the i-th frame frame after guarantee i-th-1 frame frame throwing steel
ilower than the steady torque in pipe by 0.1 ~ 8%.
3. according to claim 1ly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, it is characterized in that, the tube wall in control valve is uneven when thickening, as the moment of torsion Na of the i-th frame frame
iduring for negative torque, suitably improve the stabilized speed V2 of the i-th frame frame
iand guarantee the moment of torsion Na of the i-th frame frame
ifor on the occasion of.
4. according to claim 1ly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, it is characterized in that, the tube wall in control valve is uneven when thickening, the moment of torsion Na of the i-th frame frame after the i-th-1 frame frame throws steel
iduring unexpected rising, suitably improve the stabilized speed V2 of the i-th frame frame
i.
5. according to claim 1ly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, it is characterized in that, the tube wall in control valve is uneven when thickening, the moment of torsion Na of the i-th frame frame after the i-th-1 frame frame throws steel
iduring unexpected reduction, suitably reduce the stabilized speed V2 of the i-th frame frame
i.
6. according to claim 1ly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, it is characterized in that, the tube wall in control valve is uneven to be thickened, as the moment of torsion Na of the i-th frame frame
iwhen occurring jumping change or positive and negative values fluctuation change in the stabilization sub stage, change the i-th frame frame.
7. according to claim 1ly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, it is characterized in that, from outlet side through the i-th frame frame of the head of hot hollow forging, what control the i-th frame frame stings steel moment of torsion N1
ithan steady torque N2
ilarge 0.1 ~ 8%; From the afterbody of hot hollow forging departs from the outlet side of the i-th-1 frame frame, control the throwing steel moment of torsion N3 of the i-th frame frame
ithan steady torque N2
ilittle by 0.1 ~ 8%.
8. according to claim 1ly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, it is characterized in that, control tube head, afterbody tube wall uneven thicken time, in step a, when the i-th+1 frame frame is with V1
i+1biting speed sting steel and the i-th+1 frame frame detected sting steel moment of torsion N1
i+1after, control the motor speed of the i-th frame frame from biting speed V1
ibe reduced to stabilized speed V2
irun and the steady torque N2 of the i-th frame frame detected
iafter, complete the speeds control from stinging the steel stage and enter the stabilization sub stage;
In stepb, when the i-th-1 frame frame is with V3
i-1throwing steel speed throw steel and the throwing steel moment of torsion N3 of the i-th-1 frame frame detected
i-1after disappearance, control the motor speed of the i-th frame frame from stabilized speed V2
ibe reduced to and throw steel speed V3
irun and the throwing steel moment of torsion N3 of the i-th frame frame detected
iafter, complete from the stabilization sub stage to the speeds control throwing the steel stage;
In step c, when the i-th+1 frame frame is with V3
i+1throwing steel speed throw steel and the throwing steel moment of torsion N3 of the i-th+1 frame frame detected
i+1after disappearance, control the motor speed of the i-th frame frame from throwing steel speed V3
ibe increased to biting speed V1
irun and wait for that next hot hollow forging enters the i-th frame frame, completing the speeds control throwing the steel stage.
9. according to claim 1ly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, it is characterized in that, control tube head, afterbody tube wall uneven thicken time, 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
iderive from that stabilized speed when tube wall in control valve is uneven to be thickened is real establishes value.
10. according to claim 1ly subtract the uneven method thickened of sizing production On-line Control seamless steel pipe tube wall, it 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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| CN107774722B (en) * | 2016-08-31 | 2019-02-22 | 林州凤宝管业有限公司 | A kind of control method of stretch reducing machine CEC system |
| CN110434177B (en) * | 2019-07-17 | 2021-01-15 | 浙江美亚特精密机械有限公司 | Processing technology for reducing diameter and thickening hollow pipe |
| CN113996663B (en) * | 2021-12-31 | 2022-03-11 | 太原科技大学 | Method and system for distributing and correcting reducing rate of seamless pipe tension reducing process |
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| CN1951588A (en) * | 2002-01-28 | 2007-04-25 | 住友金属工业株式会社 | Method of producing seamless steel tubes |
| CN101553327A (en) * | 2006-11-20 | 2009-10-07 | 住友金属工业株式会社 | Manufacturing method for seamless pipe |
| CN101823075A (en) * | 2010-05-25 | 2010-09-08 | 攀钢集团有限公司 | Rolling method for sharpening head and tail wall thickness of seamless steel tube |
| CN102350441A (en) * | 2011-11-10 | 2012-02-15 | 天津商业大学 | Control method of wall thickness of seamless steel tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001300620A (en) * | 2000-04-18 | 2001-10-30 | Sumitomo Metal Ind Ltd | Method for controlling wall-thickness of seamless steel tube |
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|---|---|---|---|---|
| CN1951588A (en) * | 2002-01-28 | 2007-04-25 | 住友金属工业株式会社 | Method of producing seamless steel tubes |
| CN101553327A (en) * | 2006-11-20 | 2009-10-07 | 住友金属工业株式会社 | Manufacturing method for seamless pipe |
| CN101823075A (en) * | 2010-05-25 | 2010-09-08 | 攀钢集团有限公司 | Rolling method for sharpening head and tail wall thickness of seamless steel tube |
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