CN103056171B - Quadratic curve control method for short stroke of rough rolling vertical roll - Google Patents

Quadratic curve control method for short stroke of rough rolling vertical roll Download PDF

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Publication number
CN103056171B
CN103056171B CN201210579237.0A CN201210579237A CN103056171B CN 103056171 B CN103056171 B CN 103056171B CN 201210579237 A CN201210579237 A CN 201210579237A CN 103056171 B CN103056171 B CN 103056171B
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roll
short stroke
rolled piece
edger roll
roll gap
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CN103056171A (en
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金鹏
黄金霞
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Dalian Huayelian Automation Co., Ltd.
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AUTOMATION Co OF ANGANG GROUP
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Abstract

The invention relates to a quadratic curve control method for the short stroke of a rough rolling vertical roll. The quadratic curve shape is used for controlling the short stroke, when a rolled piece is detected to enter the short stroke at the head of a rolling mill; a programmable logic controller (PLC) enables the roll gap to reach the maximum opening of the stroke for the entering of the rolled piece, performs integral according to the speed of the vertical roll or a horizontal roll, considers effects of factors such as forward slip, tracks the head of the roller piece, calculates the length X of the rolled piece entering the vertical roll, as the process of rolling, calculates the real-time roll gap allowance Y of the vertical roll according to a quadratic curve equation, and adjusts the roll gap opening in real time; and the roll gap declines gradually in the quadratic curve shape as the entering of the rolled piece, and when the length X of the rolled piece entering the vertical roll is equal to the length L of the short stroke at the head, the roll gap allowance Y of the vertical roll is zero. By means of the method, errors generated in a broken line mode can be reduced effectively, changes of shapes of heads and tails of rolled pieces can be controlled accurately, and the control accuracy of the short stoke can be improved.

Description

A kind of roughing vertical roll short stroke conic section control method
Technical field
The present invention relates to a kind of control method of Ferrous Metallurgy hot rolling line.
Background technology
In hot rolling roughing mill rolling process, slab, after the rolling of edger roll and horizontal roller, reaches the roughing intermediate blank dimension target value of needs.According to just holding theory, edger roll side pressure makes to be with steel to form the end of a fish tail or ligulate, this is because in rolling, the section of rolled piece produces inhomogeneous deformation, cause being with the uneven elongation of steel to cause, cause head-tail width off-tolerance, after horizontal rolling, the distortion of rolled piece end not only can not be eliminated and can increase the weight of on the contrary, causes rolled piece to broaden or loses wide phenomenon.When the deviation of rolled piece end end to end exceedes permissible value, just need to cut off width off-tolerance part, thus reduce the recovery rate of metal.
Wide in order to reduce band steel Out-gauge, increase the rate of becoming a useful person of band steel, improve the control accuracy of width, have employed roughing mill vertical roll short stroke control mode end to end, what large number adopted at present is dual slope short stroke control mode.The edger roll opening degree of head end points is maximum, along with the carrying out of rolled piece, reduces opening degree, and after arriving break, continue to reduce opening degree, until reach static opening degree, afterbody is then contrary.Traditional edger roll end to end broken line short stroke control mode only has several point location, is difficult to accurately control aperture end to end, and Actual Control Effect of Strong is phase step type, accurately can not control shape of rolling piece.
Summary of the invention
The object of this invention is to provide a kind of roughing vertical roll short stroke conic section control method, the method adopts conic section shape to carry out short stroke control, effectively can reduce the error that broken line mode produces, more accurately control the change of head and tail shape, improve the precision of short stroke control.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of roughing vertical roll short stroke conic section control method, comprise edger roll head short stroke control and edger roll afterbody short stroke control, described edger roll head short stroke control mode is: when detecting that rolled piece enters milling train head short stroke, PLC stitches maximum variable quantity G according to edger roll, make roll gap reach short stroke maximum opening degree and wait for that rolled piece enters, PLC carries out integration according to the speed of edger roll or plain-barreled roll, consider the advancing slip impact waiting factor, the head of rolled piece is followed the tracks of, calculate the length of rolled piece X entering edger roll, along with the carrying out of rolling, PLC is according to quadratic curve equation, calculate the real-time roll gap correction Y of edger roll, real-time adjustment roll gap opening degree, roll gap descending with conic section shape along with entering of rolled piece reduces gradually, when the length of rolled piece X of edger roll of nipping is equal with head short run length L, edger roll roll gap correction Y=0, edger roll fixed value of roller slit returns to a reference value, and head short stroke is finished,
Described edger roll afterbody short stroke control mode is: when detecting that rolled piece enters vertical roll of rolling afterbody short stroke, the afterbody of PLC to rolled piece is followed the tracks of, calculate the length of rolled piece X entering edger roll afterbody short stroke, along with the carrying out of rolling, PLC is according to quadratic curve equation, calculate the real-time roll gap correction Y of edger roll, in real time adjustment roll gap opening degree; Roll gap ascending with conic section shape along with walking out of rolled piece increases gradually, when the length of rolled piece X of edger roll of nipping is equal with afterbody short run length L, edger roll roll gap correction Y=0, afterbody short stroke is finished;
Described quadratic curve equation is
Y = G ( D L 2 G X 2 - 1 + D G L X + 1 )
Wherein 0≤X≤L 0≤D≤G
The correction of Y – edger roll roll gap
X – enters the length of edger roll rolled piece
L – rolled piece short run length
The maximum variable quantity of G – edger roll short stroke roll gap
The curve degree of depth of D – edger roll short stroke.
Compared with prior art, the invention has the beneficial effects as follows:
The mode of conic section is adopted to carry out short stroke control, reduce the error that broken line mode produces, control the change of head and tail shape more accurately, improve the precision of edger roll short stroke control, reduce band steel Out-gauge wide, reduce and shear number of times and shearing displacement end to end, increase band steel recovery rate, reduce cost, improve quality and the qualification rate of product.
Accompanying drawing explanation
Fig. 1 is conic section control structure figure of the present invention.
Detailed description of the invention
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
The gap preset of roughing mill vertical roll, jointly completed by electronic and hydraulic pressure two covering device, when rolled piece enters roughing mill approach table, roughing mill vertical roll roll gap carries out first time APC according to second computer setting value by electric device and adjusts, after electric device adjustment, PLC calculates the deviation that electric device produces, the setting value that the roll gap deviation that electric device produces by PLC adjusts as hydraulic means, the second time of being carried out edger roll roll gap by hydraulic means adjusts, to reach the object of accurately location.Now PLC is to the setting value of hydraulic system, and as a reference value of short stroke, when rolled piece is about to arrive milling train, edger roll electric device locks, and prepares to carry out edger roll short stroke control, and short stroke control is completed by hydraulic means.Short stroke is divided into head short stroke and afterbody short stroke two kinds of modes, and one controls workpiece front end, and one controls rolled piece afterbody, also can drop into simultaneously.
For head short stroke, when HMD before edger roll (hot metal detector) detects that rolled piece enters, PLC starts to start head short stroke control program, maximum variable quantity G is stitched according to edger roll, make roll gap reach short stroke maximum opening degree and wait for that rolled piece enters, PLC carries out integration according to the speed of edger roll or plain-barreled roll, consider the advancing slip impact waiting factor, the head of rolled piece is followed the tracks of, calculate the length of rolled piece X entering edger roll, along with the carrying out of rolling, PLC is according to quadratic curve equation, calculate real-time roll gap correction Y, in real time adjustment roll gap opening degree.Roll gap descending with conic section shape along with entering of rolled piece reduces gradually, when the length of rolled piece X of edger roll of nipping is equal with head short run length L, edger roll roll gap correction Y=0, edger roll fixed value of roller slit returns to a reference value, and head short stroke is finished.Wherein D is the degree of depth of conic section, and the numerical value larger conic section degree of depth is larger, and short stroke effect amplitude is larger.Roughing mill outlet is provided with width gage, and PLC or second computer model can carry out according to width gage the adjustment that data acquisition supplies short stroke self study and L, G, D parameter.
Owing to adopting conic section mode, hydraulic system response is more quick, and roll gap change is more level and smooth, eliminates the step effect of the actual generation of traditional double broken line mode, reduces the error that broken line mode produces, and controls rolled piece change more accurately.
Quadratic curve equation formula is:
Y = G ( D L 2 G X 2 - 1 + D G L X + 1 )
Wherein 0≤X≤L 0≤D≤G
The correction of Y – edger roll roll gap
X – enters the length of edger roll rolled piece
L – rolled piece short run length
The maximum variable quantity of G – edger roll short stroke roll gap
The curve degree of depth of D – edger roll short stroke
Edger roll afterbody short stroke control mode and head short stroke control mode substantially similar, X becomes the length of rolled piece afterbody, acts on contrary with head short stroke.

Claims (1)

1. a roughing vertical roll short stroke conic section control method, it is characterized in that, comprise edger roll head short stroke control and edger roll afterbody short stroke control, described edger roll head short stroke control mode is: when detecting that rolled piece enters milling train head short stroke, PLC stitches maximum variable quantity G according to edger roll, make roll gap reach short stroke maximum opening degree and wait for that rolled piece enters, PLC carries out integration according to the speed of edger roll or plain-barreled roll, consider the impact of advancing slip factor, the head of rolled piece is followed the tracks of, calculate the length of rolled piece X entering edger roll, along with the carrying out of rolling, PLC is according to quadratic curve equation, calculate the real-time roll gap correction Y of edger roll, real-time adjustment roll gap opening degree, roll gap descending with conic section shape along with entering of rolled piece reduces gradually, when the length of rolled piece X of edger roll of nipping is equal with head short run length L, edger roll roll gap correction Y=0, edger roll fixed value of roller slit returns to a reference value, and head short stroke is finished,
Described edger roll afterbody short stroke control mode is: when detecting that rolled piece enters vertical roll of rolling afterbody short stroke, the afterbody of PLC to rolled piece is followed the tracks of, calculate the length of rolled piece X entering edger roll afterbody short stroke, along with the carrying out of rolling, PLC is according to quadratic curve equation, calculate the real-time roll gap correction Y of edger roll, in real time adjustment roll gap opening degree; Roll gap ascending with conic section shape along with walking out of rolled piece increases gradually, when the length of rolled piece X of edger roll of nipping is equal with afterbody short run length L, edger roll roll gap correction Y=0, afterbody short stroke is finished;
Described quadratic curve equation is
Y = G ( D L 2 G X 2 - 1 + D G L X + 1 )
Wherein 0≤X≤L0≤D≤G
The correction of Y – edger roll roll gap
X – enters the length of edger roll rolled piece
L – rolled piece short run length
The maximum variable quantity of G – edger roll short stroke roll gap
The curve degree of depth of D – edger roll short stroke.
CN201210579237.0A 2012-12-27 2012-12-27 Quadratic curve control method for short stroke of rough rolling vertical roll Active CN103056171B (en)

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CN103252357A (en) * 2013-05-23 2013-08-21 南京钢铁股份有限公司 Broadening rolling method with dynamic roll gap control
CN104249084B (en) * 2014-09-26 2016-06-01 成都金自天正智能控制有限公司 A kind of method improving band steel portion's width accuracy end to end when hot continuous rolling is produced
CN104324949B (en) * 2014-11-14 2016-08-17 北京金自天正智能控制股份有限公司 A kind of acquisition methods of roughing vertical roll passage edger roll opening degree
CN104907342A (en) * 2015-06-19 2015-09-16 首钢京唐钢铁联合有限责任公司 Rough rolling short stroke control method
CN105798253B (en) * 2016-06-06 2017-08-04 重庆大学 A kind of chilling roller of casting for shaped blank continuous two stitches method of adjustment
CN108213089B (en) * 2016-12-09 2019-06-25 宝山钢铁股份有限公司 Continuous hot-rolling mill edger roll roll gap control method
CN109513749B (en) * 2018-11-01 2020-06-02 北京首钢股份有限公司 Method and device for controlling width of head and tail of hot rolled strip steel

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Patentee before: Automation Company of Angang Group