CN107282647B - Control device and method for eliminating tail size out-of-tolerance in bar continuous rolling - Google Patents

Control device and method for eliminating tail size out-of-tolerance in bar continuous rolling Download PDF

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Publication number
CN107282647B
CN107282647B CN201710502087.6A CN201710502087A CN107282647B CN 107282647 B CN107282647 B CN 107282647B CN 201710502087 A CN201710502087 A CN 201710502087A CN 107282647 B CN107282647 B CN 107282647B
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bar
tail
tolerance
rolling mill
size
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CN107282647A (en
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张振亚
王敬文
秦友刚
唐炳水
华祺年
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Shijiazhuang Iron and Steel Co Ltd
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Shijiazhuang Iron and Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/18—Automatic gauge control
    • B21B37/20—Automatic gauge control in tandem mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

A control device and a control method for eliminating tail size deviation of bar continuous rolling belong to the technical field of bar continuous rolling equipment and method and are used for eliminating product tail size deviation in bar continuous rolling production. The technical proposal is as follows: the invention adopts a programmable controller, a metal detection element, an encoder, a communication network and a diameter measuring instrument to monitor the tail size of the bar, the programmable controller duly reduces the speed of an upstream frame of a finished product frame according to the length of the out-of-tolerance of the tail size of the bar, the speed reduction amplitude is automatically calculated by an automatic control system according to the comparison between the out-of-tolerance size of the tail of the bar and the standard size, the tension of the bar between frames is increased by reducing the speed of the upstream frame, and the out-of-tolerance tail size reaches the qualified range under the action of the tension. The invention is the first initiation of the bar continuous rolling technology, is easy to operate, quick to adjust and remarkable in effect, solves the problem of out-of-tolerance size of the tail part of the product commonly existing in bar continuous rolling production, remarkably improves the product yield and reduces the production cost.

Description

Control device and method for eliminating tail size out-of-tolerance in bar continuous rolling
Technical Field
The invention relates to a control device and a control method for eliminating the out-of-tolerance of the tail size of a product in bar continuous rolling production, and belongs to the technical field of bar continuous rolling equipment and method.
Background
In bar continuous rolling production, the problem of out-of-tolerance tail size is very prominent, and the main reasons for the out-of-tolerance tail size are two: firstly, the tail part of the hot blank is rolled later than the head part, the heat dissipation time is long, so that the temperature of the tail part is lower than that of the head part, and the plastic deformation is reduced during rolling; secondly, tension is acted between rolling mills in the rolling process, when the tension disappears after the tail is separated from the rolling mill, elastic recovery can occur to enable the tail size to be increased due to plastic deformation, and the tail size of the finished product is out of tolerance due to superposition of elastic recovery amounts of the tail of each frame on the upper side of the finished product frame. The conventional method for adjusting the roll gap rolling reduction can only partially adjust the tail of the bar with the out-of-tolerance size on the basis of considering that the size of the whole bar meets the tolerance requirement, so that the operation difficulty is increased, and in many cases, the adjustment method cannot enable the size of the tail of the bar to meet the product precision requirement, which is a common problem in continuous rolling production of the bar. Because the out-of-tolerance portion can only be used as scrap, the production cost is increased, and the quality claim event can be caused once the product is carelessly sold.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control device and a method for eliminating the tail size out-of-tolerance by continuous rolling of bars, which can timely reduce the speed of an upstream frame according to the tail length of the out-of-tolerance bar so as to increase the tension of the bars between frames and enable the out-of-tolerance tail size to reach a qualified range under the action of the tension.
The technical scheme for solving the technical problems is as follows:
the control device for eliminating the tail size out-of-tolerance in continuous rolling of bars comprises a programmable controller, metal detection elements, an encoder, a communication network and a diameter measuring instrument, wherein the encoder is fixed at the tail part of a motor main shaft of a finished product rolling mill, the two metal detection elements are arranged at the rear part of the finished product rolling mill, the diameter measuring instrument is positioned between the finished product rolling mill and the metal detection elements, the programmable controller is provided with a high-speed counting template and a digital input template with a hardware interrupt function, the high-speed counting template is connected with the encoder fixed at the tail part of the motor main shaft of the finished product rolling mill, the digital input template with the hardware interrupt function is connected with the two metal detection elements at the rear part of the finished product rolling mill, and the programmable controller is connected with a transmission device of each secondary rolling mill through the communication network.
A control device for eliminating the tail size out-of-tolerance of bar continuous rolling is provided, wherein the distance between two metal detection elements is set to be L.
A control method for eliminating the tail size out-of-tolerance by using the control device for continuous bar rolling comprises the following steps:
a. the programmable controller counts the pulses of the encoder in real time through a self-contained high-speed counting template, and when the bar is rolled sequentially by each frame of rolling mill, the difference of the counting values when the head of the bar passes through two metal detection elements and the distance L between the two metal detection elements are calculated, so that the length Deltal of the bar finished product corresponding to the single pulse is calculated;
b. when the tail part of the bar isSequential disengagement ST 1 ～ST k ～ST n When the rolling mill is used, the tail part of the bar is separated from the rolling mill signal and judged by the moment sudden drop change edge of each rolling mill motor, and the programmable controller respectively records the current pulse count value N of the encoder 1 ～N k ～N n If the calliper detects a length L from the tail of the finished product t If the finished product size of (3) is out of tolerance, L can be calculated t Corresponding pulse number N t =L t /△l，L t Is the tail length value of the finished product with the out-of-tolerance bar, N t Is a pulse value corresponding to the tail out-of-tolerance length value;
c. if the following equation holds: n (N) n -N t -N k = Δn++0 (k < N-1), and N n -N t -N k+1 When the weight of the tail of the bar is less than 0, the ST can be judged k After the rolling mill is put up and subjected to delta N pulses, the size of a finished product starts to generate an out-of-tolerance problem, and then the programmable controller controls the transmission device to start to slow down the single or multiple upstream frames of the finished product frame through the communication network from the moment;
d. if k=n-1, i.e. N t ≦N n -N n-1 At this time, the tail of the bar is separated from ST n-1 The frame rolling machine is then operated for ST n-1 The speed regulation of the frame rolling mill is carried out too late, and the speed regulation time is changed to be that the tail part of the bar is separated from ST n-2 Rolling mill and pass through N n-1 -N n-2 -N t Start of pulse in advance of ST n-1 The frame rolling mill carries out speed regulation, but the speed regulation mode is different from the case that k is less than n-1;
e. the speed adjusting function of the upstream frame is finished from the defect of out-of-tolerance of the tail size of the bar to the end when the tail of the bar is separated from the controlled rolling mill.
The control method for eliminating the tail size out-of-tolerance by continuous rolling of the bar material only aims at ST if the tail out-of-tolerance amplitude of the bar material is not large n-1 The speed regulation is carried out by a frame rolling mill; if the tail of the bar is too large, the upstream frame ST can be also used for preventing the negative influence of excessive tension on the bar shape, such as ovality, caused by the large-scale speed reduction of a single frame n-2 ～ST k Respectively carry out speed regulation and controlAnd (5) preparing.
According to the control method for eliminating the tail size out-of-tolerance in the continuous rolling of the bar, the rotating speed adjustment amount of the finished product upstream rolling mill is determined, the out-of-tolerance part of the finished product size is compared with the standard size to obtain the out-of-tolerance cross section delta S, and the principle that the second flow of each rolling metal in the continuous rolling production is equal is adopted: the product V of the speed of the finished rack and the cross-sectional area delta S of the super-difference n Is equal to the adjusted rack ST k Is of hole-type cross-section S k And the speed regulating quantity DeltaV k Is the product of (1), namely: deltaV k =△S*V n /S k The operator can properly fine-tune the adjustment speed of the upstream rack based on the actual adjustment effect.
The control method for eliminating the tail size out-of-tolerance of the continuous rolling of the bar material aims at a single frame ST n-1 Under the condition of speed regulation of the frame rolling mill, if the out-of-tolerance sizes of the tail parts are basically consistent, the same rotation speed adjustment amount is adopted; if the out-of-tolerance size of each section of the tail is large in difference, the same rotation speed adjustment amount cannot meet the size precision requirement, and different rotation speed adjustment amounts are adopted for controlling in sections.
The control method for eliminating the tail size out-of-tolerance of the continuous rolling of the bar material aims at a single frame ST n-1 Speed regulation and N of frame rolling mill t ≦N n -N n-1 In the case of (1) n-1 When the frame rolling mill starts to regulate speed, the starting position of the out-of-tolerance bar tail just bites into ST n-1 A rolling mill, at this time, the rolling mill ST n-1 To the finished rack ST n The middle part of the bar meets the size requirement, if the bar is suddenly decelerated, the generated tension increment can have adverse effect on the qualified bar of the part, for example, the size is reduced, and the deceleration range is 0 to DeltaV n-1 Ramp time is L t /V n The ramp down method has good application effect.
The control method for eliminating the tail size out-of-tolerance by continuous rolling of the bars takes the effect of eliminating the bar size out-of-tolerance of each controlled rack at the downstream of each controlled rack into consideration when a plurality of rolling mills participate in speed regulation.
The beneficial effects of the invention are as follows:
the invention adopts a programmable controller, a metal detection element, an encoder, a communication network and a diameter measuring instrument to monitor the tail size of the bar, the programmable controller duly reduces the speed of an upstream frame of a finished product frame according to the length of the out-of-tolerance of the tail size of the bar, the speed reduction amplitude is automatically calculated by an automatic control system according to the comparison between the out-of-tolerance size of the tail of the bar and the standard size, the tension of the bar between frames is increased by reducing the speed of the upstream frame, and the out-of-tolerance tail size reaches the qualified range under the action of the tension.
The invention is the first creation of the bar continuous rolling technology, is easy to operate, has quick adjustment and obvious effect, achieves the out-of-tolerance bar tail size meeting the precision requirement by a method for increasing the tension between frames by timely reducing the speed of an upstream frame of a finished product frame by a bar continuous rolling automatic control system, solves the out-of-tolerance product tail size problem commonly existing in the existing bar continuous rolling production, obviously improves the product yield, reduces the production cost, improves the economic benefit of enterprises, and has excellent popularization and use value in industry.
Drawings
FIG. 1 is a schematic diagram of a control device for eliminating tail dimension out-of-tolerance according to the present invention.
The figures are labeled as follows: ST (ST) k Frame rolling mill 1, ST n-1 Frame rolling mill 2, ST n The rolling mill comprises a rolling mill frame 3, a bar 4, a transmission device 5, a programmable controller 6, a metal detection element 7, an encoder 8, a communication network 9 and a calliper 10.
Detailed Description
The control device for eliminating the tail size out-of-tolerance in continuous rolling of the bar material consists of a programmable controller 6, a metal detection element 7, an encoder 8, a communication network 9 and a calliper 10.
The encoder is shown fixed to the end of the motor spindle of the finishing mill for pulse counting. Two metal detecting elements 7 are installed at the rear of the finishing mill, and the distance between the two metal detecting elements 7 is set to L. The diameter measuring instrument 10 is arranged at the rear part of the finished product rolling mill, the distance measuring instrument 10 is arranged between the finished product rolling mill and the metal detection element 7, and the finished product rolling mill is ST in the drawing n And (3) a rolling mill.
The programmable controller 6 is shown with a high-speed counting template and a digital input template with a hardware interrupt function. High-speed counting template and fixing at ST n The encoder 8 at the tail of the motor spindle of the frame rolling mill 3 (finishing rolling mill) is connected with a digital input template with a hardware interrupt function and ST n Two metal detection elements 7 behind the rolling mill 3 (finished rolling mill) are connected, and the programmable controller 6 is connected with a transmission device 5 of each rolling mill through a communication network 9, wherein the transmission device 5 comprises a frequency converter, a motor, a reduction gearbox and other components.
The control method for eliminating the tail size out-of-tolerance by continuous rolling of the bar material comprises the following steps:
a. the programmable controller 6 counts the pulses of the encoder 8 in real time through a self-contained high-speed counting template, and when the bar 4 is sequentially rolled by each frame of rolling mill, the difference between the counted values when the head of the bar 4 passes through the two metal detection elements 7 and the distance L between the two metal detection elements 7 are calculated to calculate the finished product length Deltal of the bar 4 corresponding to a single pulse;
b. when the tail part of the bar is sequentially separated from ST 1 ～ST k ～ST n When rolling mill, the tail of bar is separated from the signal of rolling mill, and the moment suddenly drop change edge of motor of every rolling mill is used to judge, and the programmable controller 6 can respectively record the pulse count value N of encoder 8 at that time 1 ～N k ～N n The calliper 10 if detected a length L from the end of the finished product t If the finished product size of (3) is out of tolerance, L can be calculated t Corresponding pulse number N t =L t /△l，L t Is the tail length value of the finished product with the out-of-tolerance bar, N t Is a pulse value corresponding to the tail out-of-tolerance length value;
c. if the following equation holds: n (N) n -N t -N k = Δn++0 (k < N-1), and N n -N t -N k+1 When the weight of the tail of the rod is less than 0, the separation ST of the tail of the rod can be judged k After the rolling mill is put up and subjected to delta N pulses, the finished product size starts to be out of tolerance, and the programmable controller controls the transmission device to be paired through the communication network from the momentThe upstream frame of the product frame starts to slow down;
d. if k=n-1, i.e. N t ≦N n -N n-1 At this time, the tail of the bar is separated from ST n-1 The frame rolling machine is then operated for ST n-1 The speed regulation of the frame rolling mill is carried out too late, and the speed regulation time is changed to be that the tail part of the bar is separated from ST n-2 Rolling mill and pass through N n-1 -N n-2 - N t Start of pulse in advance of ST n-1 The frame rolling mill carries out speed regulation, but the speed regulation mode is different from the case that k is less than n-1;
e. the speed adjusting function of the upstream frame is finished from the defect of out-of-tolerance of the tail size of the bar to the end when the tail of the bar is separated from the controlled rolling mill.
In the implementation process of the method, a speed regulation frame is required to be selected, and the method is carried out according to the following principle:
if the out-of-tolerance amplitude of the tail part of the bar is not large, only ST n-1 The speed regulation is carried out by a frame rolling mill;
if the out-of-tolerance amplitude of the tail part of the bar is larger, in order to prevent the adverse effect of excessive tension on the bar shape, such as ovality, caused by the large-amplitude deceleration of a single frame, the upstream ST can also be performed n-2 ～ST k The frame rolling mill respectively carries out speed regulation control.
In the implementation process of the method, the adjustment amount needs to be controlled according to the following principles:
comparing the out-of-tolerance part of the finished product size with the standard size to obtain the out-of-tolerance sectional area delta S, and according to the principle that the second flow of each rolling metal in the continuous rolling production is equal: the product V of the cross-sectional area and the speed of the finished rack n Is equal to the adjusted rack ST k Hole type cross section S k (groove parameters) and speed adjustment DeltaV k Is the product of (1), namely: deltaV k =△S*V n /S k The operator can properly fine-tune the adjustment speed of the upstream rack based on the actual adjustment effect.
For a single frame ST n-1 Speed regulation of the frame rolling mill: if the tail out-of-tolerance dimensions are basically consistent, the same rotation speed adjustment amount is adopted; if the tail sections are out of tolerance in sizeThe difference is large, the same rotation speed adjustment amount can not meet the requirement of dimensional accuracy, and different rotation speed adjustment amounts are adopted for control in a segmented mode.
For a single frame ST n-1 Speed regulation and N of frame rolling mill t ≦N n -N n-1 Is the case: when it is opposite to ST n-1 When the frame rolling mill starts to regulate speed, the starting position of the out-of-tolerance bar tail just bites into ST n-1 Frame rolling mill, ST at this time n-1 Setting up rolling mill to finished stand ST n The rolling part between the frame rolling mills meets the size requirement, if the speed is suddenly reduced, the generated tension increment can have adverse effect (size is reduced) on the part of qualified bar, and the speed is reduced by 0 to DeltaV n-1 Ramp time is L t /V n The ramp down method has good application effect.
The condition of participating in speed regulation for a plurality of rolling mills: the speed reduction of each controlled rolling mill should take into account all the effects exerted by each controlled stand downstream of it for eliminating the oversize of bars.
In addition, for a looper controlled mill train upstream of the finished product stand, the above-described manner of directly adjusting the speed of the upstream stand cannot be employed. Because the speed of the upstream frame is reduced according to the principle that the flow of the rolled metal seconds is equal in continuous rolling production, the instant flow of the metal seconds is reduced by the reduction of the speed of the upstream frame, so that the sleeve height is reduced, but the speed of the upstream frame is increased under the action of loop closed-loop control, so that the sleeve height reaches a given value, and as a result, the speed adjustment amount is zero, the tension between frames is unchanged, and the adjustment fails.
The improvement of the bar tension between the frames with the loop control can be realized by a method of modifying the loop high feedback value in a PLC control program. The loop is in a stable state during the normal rolling process, and the actual loop height is equal to the set loop height value (h 0 =H set ) When the tail of the bar with the ultra-poor size passes through, the control system timely adds a positive adjustment value delta h to the feedback value of the loop height, and the adjusted feedback value h 1 Will be greater than the given value H set Under the action of the controller, the control system controls the conveying system to reduce the rotating speed of the upstream frame, and the height of the loop is reduced to enableThe adjusted set-up feedback value is re-equal to the given value. Practice proves that: the lower the sleeve height is in the normal working range of the loop, the greater the bar tension is. The result of the deceleration of the upstream frame is an increase in bar tension between the frames and a decrease in bar size.
Because the rod tension between loops is related to factors such as loop height, rod specification size, rolling temperature, loop height set value, loop air source pressure and the like, the adjusting value of the loop height feedback quantity cannot be accurately determined through theoretical calculation. In practical application, the corresponding relation between the size out-of-tolerance amplitude and the sleeve height adjusting value can be determined according to bar specifications by a priori method, and the adjusting value of the sleeve height feedback quantity is appropriately increased or decreased according to the adjusting effect.

Claims (4)

1. A control method for eliminating tail size out-of-tolerance in bar continuous rolling is characterized by comprising the following steps: the used control device comprises a programmable controller (6), metal detection elements (7), an encoder (8), a communication network (9) and a diameter measuring instrument (10), wherein the encoder (8) is fixed at the tail part of a motor spindle of a finished product rolling mill, the two metal detection elements (7) are arranged at the rear part of the finished product rolling mill, the diameter measuring instrument (10) is positioned between the finished product rolling mill and the metal detection elements (7), the programmable controller (6) is provided with a high-speed counting template and a digital input template with a hardware interrupt function, the high-speed counting template is connected with the encoder (8) fixed at the tail part of the motor spindle of the finished product rolling mill, the digital input template with the hardware interrupt function is connected with the two metal detection elements (7) at the rear part of the finished product rolling mill, and the programmable controller (6) is connected with a transmission device (5) of each frame rolling mill through the communication network (9);
the method comprises the following steps:
a. the programmable controller counts the pulses of the encoder (8) in real time through a self-contained high-speed counting template, and when the bar (4) is sequentially rolled by each frame of rolling mill, the difference of the counted values when the head of the bar passes through the two metal detection elements (7) and the distance L between the two metal detection elements (7) are calculated to calculate the length Deltal of the bar finished product corresponding to the single pulse;
b. when the bar materialTail sequential disengagement ST 1 ～ST k ～ST n When rolling mill, the tail of bar is separated from the signal of rolling mill and the moment suddenly drop change edge of motor of each rolling mill is used to judge, the programmable controller (6) respectively records the pulse count value N of encoder (8) at that time 1 ～N k ～N n If the diameter measuring instrument (10) detects the length L from the tail of the finished product t If the finished product size of (3) is out of tolerance, L can be calculated t Corresponding pulse number N t ＝L t the/DELTAl and Lt are the tail length values of finished products with the out-of-tolerance bars, and Nt is a pulse value corresponding to the out-of-tolerance tail length values;
c. if the following equation holds: n (N) n -N t -N k = Δn+.gtoreq.0, k < N-1, and N n -N t -N k+1 When the weight of the tail of the bar is less than 0, the ST can be judged k After the rolling mill is put up and subjected to delta N pulses, the size of a finished product starts to generate an out-of-tolerance phenomenon, and then the programmable controller (6) starts to control the transmission device (5) to start to slow down the upstream frame of the finished product frame through the communication network (9) from the moment;
d. if k=n-1, i.e. N t ≦N n -N n-1 At this time, the tail of the bar is separated from ST n-1 The frame rolling machine is then operated for ST n-1 The speed regulation of the frame rolling mill is carried out too late, and the speed regulation time is changed to be that the tail part of the bar is separated from ST n-2 Rolling mill and pass through N n-1 -N n-2 -N t Start of pulse in advance of ST n-1 The frame rolling mill carries out speed regulation, but the speed regulation mode is different from the case that k is less than n-1;
e. the speed adjusting function of the upstream frame is finished from the defect of out-of-tolerance of the tail size of the bar to the end when the tail of the bar is separated from the controlled rolling mill.
2. The control method for eliminating tail size out-of-tolerance by continuous bar rolling according to claim 1, wherein the control method comprises the following steps: the distance between the two metal detection elements (7) is set to L.
3. The control method for eliminating tail size out-of-tolerance in bar continuous rolling according to claim 1 or 2, characterized by comprising the following steps ofThe method comprises the following steps: determining the rotation speed adjustment quantity of a loop-free control rolling line, comparing the out-of-tolerance part of the finished product size with the standard size to obtain the out-of-tolerance cross section delta S, and according to the principle that the second flow of each rolling metal in continuous rolling production is equal: the product V of the speed of the finished rack and the cross-sectional area delta S of the super-difference n Is equal to the adjusted rack ST k Hole type cross section S k And the speed regulating quantity DeltaV k Is the product of (1), namely: deltaV k ＝△S*V n /S k The operator finely adjusts the adjustment speed of the upstream frame based on the actual adjustment effect.
4. The control method for eliminating tail size out-of-tolerance by continuous bar rolling according to claim 3, wherein the control method comprises the following steps: for a single frame ST n-1 Speed regulation and N of frame rolling mill t ≦N n -N n-1 In the case of (1) n-1 When the frame rolling mill starts to regulate speed, the starting position of the out-of-tolerance bar tail just bites into ST n-1 Frame rolling mill, ST at this time n-1 Setting up rolling mill to finished stand ST n The rolling part between the frame rolling mills meets the size requirement, if the speed is suddenly reduced, the generated tension increment can have adverse effect on the qualified bar of the part, for example, the size is reduced, and the speed is reduced by 0 to DeltaV n-1 Ramp time is L t /V n The ramp down method has good application effect.
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