CN103447309A - Method for controlling steel throwing distance of hot-rolling reversing roughing mill - Google Patents

Method for controlling steel throwing distance of hot-rolling reversing roughing mill Download PDF

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Publication number
CN103447309A
CN103447309A CN201310395237XA CN201310395237A CN103447309A CN 103447309 A CN103447309 A CN 103447309A CN 201310395237X A CN201310395237X A CN 201310395237XA CN 201310395237 A CN201310395237 A CN 201310395237A CN 103447309 A CN103447309 A CN 103447309A
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China
Prior art keywords
steel
passage
speed
distance
throwing
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CN201310395237XA
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毕立军
赵继武
汪万根
王文忠
刘京涛
孙会杰
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Shougang Jingtang United Iron and Steel Co Ltd
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Shougang Jingtang United Iron and Steel Co Ltd
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Priority to CN201310395237XA priority Critical patent/CN103447309A/en
Publication of CN103447309A publication Critical patent/CN103447309A/en
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Abstract

The invention discloses a method for controlling a steel throwing distance of a hot-rolling reversing roughing mill and belongs to the field of the metallurgical industry. The method comprises the following steps: a, acquiring a pass selection i from a second stage, executing the step b if i is less than or equal to 6, executing a seventh pass steel throwing program and then finishing the process if i is equal to 7, or finishing the process; b, setting a steel throwing speed in each pass into VPGi and assigning the steel throwing speed corresponding to the pass i in the variable VPGi; c, by a formula VTSi=VPGi+VC, acquiring a time-delay shutdown speed VTSi in the pass i; d, by a formula Ti=Si/VTSi, acquiring a steel throwing delay time Ti in the pass i; and e, acquiring the actual steel throwing distance Xi=Si+STi in the pass i. According to the method, the actual steel throwing distance of a slab is guaranteed to be accurately controlled in the effective range of hot detection in the front of a rolling mill and reversed water spraying behind the rolling mill; the rolling cycle of a roughing region is improved; and serious fault alarm of transmission and an accident that the slab cannot be normally rolled are avoided.

Description

The reversible roughing mill of hot rolling is thrown the control method of steel distance
Technical field
The present invention relates to metallurgical industry field, particularly relate to the control method that the reversible roughing mill of a kind of hot rolling is thrown the steel distance.
Background technology
Roughing mill is the visual plant of hot rolling line, and by strange, the even passage control to roughing mill, (strange passage rolling direction is the finishing mill direction; Even passage rolling direction is the heating furnace direction), slab rolling is become to intermediate slab thickness, then sending into the finishing mill rolling is finished strip.
Hot rolling roughing district flat roll mill generally comprises two roller roughing mills (called after R1) and four-high rougher (called after R2); The R1 milling train is in upstream, and the R2 milling train is in downstream; The roller-way of connection and inlet roller way etc. are arranged before R1; R1 outlet roller-way is arranged between R1 and R2 milling train, connect roller-way, R2 inlet roller way etc.; There is the outlet roller-way at the R2 rear portion and is connected roller-way etc. with the finish rolling district; R1 and R2 are reversible roughing mills, and the roughing mill top working roll is connected with upper motor; Bottom working roll is connected with lower motor.By the motion of motor forward and backward, drive roughing mill slab is carried out to reversible rolling.From secondary, provide data processing model and functional mode to send control command to one-level process control computer PLC, one-level provides that process is electric, the direct control of hydraulic pressure and pneumatic actuator realizes the automatic control to roughing mill.What secondary was the most frequently used to the control of roughing mill is the 1+7 control model, that is: R1 rolling 1 passage, R2 rolling 7 passages.The control command that secondary sends to one-level partly comprises: passage is selected I, every time biting speed, mill speed, throwing steel speed etc.
Cause throwing steel when the throwing steel of roughing mill distance often improves because of flat roll mill speed at present excessively far away, cause the passage of milling train long interval time, had a strong impact on the rolling rhythm in roughing zone; Perhaps, because cause the slab heat inspection before and after roughing mill of not dishing out during the Speed Reduction of flat roll mill, cause program can't arrive next step, normally rolling of slab, had a strong impact on carrying out smoothly of mill milling, must change the control method of throwing steel distance.
Summary of the invention
In view of this, the object of the present invention is to provide and a kind ofly guarantee that the actual throwing of slab steel distance accurately is controlled at before milling train after heat inspection and milling train in the effective range of contrary water spray.
The invention provides the reversible roughing mill of a kind of hot rolling and throw the control method of steel distance, comprising:
A, obtain passage from secondary and select i, if i is less than or equal to 6 execution step b; If i equals 7 carry out after the 7th passage is thrown the steel program and finish; Otherwise process ends;
B, every time is set, and to throw steel speed be V pGi, by the throwing steel speed assignment issued from secondary of corresponding i passage to variable V pGi;
C, by formula V tSi=V pGi+ V cobtain i passage delayed shutdown speed V tSi, wherein, V cfixing velocity constant, V c=0.5m/s;
D, by formula T i=S i/ V tSiobtain the i passage and throw steel delay time T i, wherein, S ithat the i passage is thrown steel time delay distance constant;
E, obtain the actual throwing of i passage steel distance X i=S i+ S ti, wherein, S tithe distance that when expression speed becomes 0 speed from delayed shutdown speed, slab is walked, S ti=V tSi 2/ 2a, a is acceleration, a=1.14m/s 2.
The reversible roughing mill of hot rolling provided by the invention is thrown the control method of steel distance, by calculating, first draws every time delayed shutdown speed V tsi, then set the throwing steel time delay distance constant of the first passage to the six passages, according to formula T i=S i/ V tSi, calculate the throwing steel delay time of the first passage to the six passages, finally calculate the actual throwing of the first passage to the six passage steel distance.The method has guaranteed that the actual throwing of slab steel distance accurately is controlled at before milling train after heat inspection and milling train in the effective range of contrary water spray, has effectively improved the rolling rhythm in roughing zone, has avoided the heavy fault alarm of transmission and the slab can't normally rolling accident.
The accompanying drawing explanation
Speed, time and position view that Fig. 1 is strange passage rolling in the embodiment of the present invention;
Fig. 2 throws the control method flow chart of steel distance for the reversible roughing mill of hot rolling that the embodiment of the present invention provides;
The schematic diagram that Fig. 3 is roughing mill rolled slab in the embodiment of the present invention.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
The reversible roughing mill of the hot rolling that the embodiment of the present invention provides is thrown the control method of steel distance, by calculating, first draws every time delayed shutdown speed V tsi(position of the actual throwing of corresponding milling train steel point as shown in Figure 1), then set the throwing steel time delay distance constant of the first passage to the six passages, is respectively S 1, S 2, S 3, S 4, S 5, S 6, according to formula T i=S i/ V tSi, the throwing steel delay time that calculates the first passage to the six passages is T 1, T 2, T 3, T 4, T 5, T 6, finally calculate the actual throwing of the first passage to the six passage steel distance X 1, X 2, X 3, X 4, X 5, X 6.The method has guaranteed that the actual throwing of slab steel distance accurately is controlled at before milling train after heat inspection and milling train in the effective range of contrary water spray, has effectively improved the rolling rhythm in roughing zone, has avoided the heavy fault alarm of transmission and the slab can't normally rolling accident.
Fig. 2 throws the control method flow chart of steel distance for the reversible roughing mill of hot rolling that the embodiment of the present invention provides, and comprises the following steps:
Step 201, obtain passage from secondary and select i.It is that the tracking of secondary reception rolling line material is calculated by the secondary counter that passage is selected i, and one-level is to receive the data that secondary issues when every time finishes.For example, after R2 rolling the first passage finishes, secondary calculates passage and selects I=2, the I=2 that now one-level receives.
Step 202, judgement passage are selected i, if i is less than or equal to 6 execution steps 203, if i equals 7 carry out after the 7th passage is thrown the steel program and finish, if i is greater than 7 process ends.Because maximum rolling 7 passages of R2, this is determined by secondary pattern.
Step 203, obtain every time and throw steel speed V pGi(as shown in Figure 1), specifically by the throwing steel speed assignment issued from secondary of corresponding i passage to variable V pGi.The speed array that assignment method is handed down to one-level by one-level to secondary while being every time end is obtained.
Step 204, by formula V tSi=v pGi+v ccalculate i passage delayed shutdown speed V tSi, V cfixing velocity constant, V c=0.5m/s.Purpose is to consume by improving milling train throwing steel speed the energy that milling train produces in the operation of rolling, effectively prevents the heavy fault alarm of transmission.
Step 205, according to formula T i=S i/ V tSithereby, calculate the i passage and throw steel delay time T i.S ibe that the i passage is thrown steel time delay distance constant, set the throwing steel time delay distance constant of the first passage to the six passages, be respectively S 1, S 2, S 3, S 4, S 5, S 6, wherein, S 1=4000mm, S 2=6200mm, S 3=3800mm, S 4=6000mm, S 5=3600mm, S 6=5800mm, S 1to S 6it is empirical value.General because maximum rolling seven passages of reversible roughing mill, after the 7th passage rolling completes, the speed of milling train directly becomes latency speed, slab directly is sent to the finishing mill zone, so do not need to design the throwing steel distance of the 7th passage, only (Fig. 1 marks S to the throwing steel time delay distance constant of needs setting the first passage to the six passages i), be respectively S 1, S 2, S 3, S 4, S 5, S 6.The throwing steel delay time that further calculates the first passage to the six passages is T 1, T 2, T 3, T 4, T 5, T 6.
Step 206, by calculating the actual throwing of i passage steel distance X i=S i+ S ti, S wherein ti(Fig. 1 marks S to the distance that when expression speed becomes 0 speed from delayed shutdown speed, slab is walked ti), S ti=V tSi 2/ 2a, a is acceleration, acceleration definition: be protection frequency converter and motor device, the definition motor speed from zero-speed to the most at a high speed or from response time to zero-speed the most at a high speed be 5S, calculate acceleration a=1.14m/s according to speed and response time 2.
Fig. 3 is four-high mill R2 schematic diagram, and wherein HMD is the heat inspection, and schematic diagram is mainly showed the front heat inspection of R2 and the rear distance against water spray to R2, and slab is thrown steel end position, odd even passage direction in the odd even passage.
The present embodiment has guaranteed the actual throwing of slab steel apart from the contrary effective range of spraying water after heat inspection before accurately being controlled at milling train and milling train, and the time shorten of roughing mill rolling 5 passages has arrived the 73s left and right, effectively raises the rolling rhythm in roughing zone.In the prior art, it is fixed constant that strange passage is thrown steel time delay distance constant, that is: S 1=S 3=S 5=C, because every time throws steel speed difference, cause throwing steel apart from difference, also do not consider in addition S ti, therefore cause and throw the steel distance, in like manner even passage is also like this.And, based on the present embodiment, surveying the original 5 passages throwing steel times is 90s, be 73s now.
In a word, the foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.

Claims (3)

1. the control method of the reversible roughing mill throwing of a hot rolling steel distance, is characterized in that, comprising:
A, obtain passage from secondary and select i, if i is less than or equal to 6 execution step b; If i equals 7 carry out after the 7th passage is thrown the steel program and finish; Otherwise process ends;
B, every time is set, and to throw steel speed be V pGi, by the throwing steel speed assignment issued from secondary of corresponding i passage to variable V pGi;
C, by formula V tSi=V pGi+ V cobtain i passage delayed shutdown speed V tSi, wherein, V cfixing velocity constant, V c=0.5m/s;
D, by formula T i=S i/ V tSiobtain the i passage and throw steel delay time T i, wherein, S ithat the i passage is thrown steel time delay distance constant;
E, obtain the actual throwing of i passage steel distance X i=S i+ S ti, wherein, S tithe distance that when expression speed becomes 0 speed from delayed shutdown speed, slab is walked, S ti=V tSi 2/ 2a, a is acceleration, a=1.14m/s 2.
2. the reversible roughing mill of hot rolling according to claim 1 is thrown the control method of steel distance, it is characterized in that, the described steel speed assignment of throwing is to variable V pGistep specifically comprise:
Every time speed array that is handed down to one-level by one-level to secondary while finishing is obtained.
3. the reversible roughing mill of hot rolling according to claim 2 is thrown the control method of steel distance, it is characterized in that described S iestablishing method be:
The throwing steel time delay distance constant of the 1st passage to the 6 passages is respectively S 1, S 2, S 3, S 4, S 5, S 6, wherein, S 1=4000mm, S 2=6200mm, S 3=3800mm, S 4=6000mm, S 5=3600mm, S 6=5800mm.
CN201310395237XA 2013-09-03 2013-09-03 Method for controlling steel throwing distance of hot-rolling reversing roughing mill Pending CN103447309A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106111706A (en) * 2016-06-21 2016-11-16 山东钢铁股份有限公司 A kind of hot rolling roller-way fragment delay parking method
CN110586658A (en) * 2019-09-27 2019-12-20 北京科技大学设计研究院有限公司 Control method for shortening rolling pass interval time of reversible roughing mill
CN113909298A (en) * 2021-09-24 2022-01-11 江苏省沙钢钢铁研究院有限公司 Steel plate hot rolling mill train and control method of steel throwing distance thereof
CN113996654A (en) * 2020-07-28 2022-02-01 宝山钢铁股份有限公司 Operation control method of roughing mill

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CN101219437A (en) * 2008-01-23 2008-07-16 广州珠江钢铁有限责任公司 Plate strip hot mill rolling sequencing control method

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106111706A (en) * 2016-06-21 2016-11-16 山东钢铁股份有限公司 A kind of hot rolling roller-way fragment delay parking method
CN110586658A (en) * 2019-09-27 2019-12-20 北京科技大学设计研究院有限公司 Control method for shortening rolling pass interval time of reversible roughing mill
CN110586658B (en) * 2019-09-27 2020-09-11 北京科技大学设计研究院有限公司 Control method for shortening rolling pass interval time of reversible roughing mill
CN113996654A (en) * 2020-07-28 2022-02-01 宝山钢铁股份有限公司 Operation control method of roughing mill
CN113996654B (en) * 2020-07-28 2024-03-08 宝山钢铁股份有限公司 Operation control method of roughing mill
CN113909298A (en) * 2021-09-24 2022-01-11 江苏省沙钢钢铁研究院有限公司 Steel plate hot rolling mill train and control method of steel throwing distance thereof
CN113909298B (en) * 2021-09-24 2023-10-10 江苏省沙钢钢铁研究院有限公司 Steel plate hot rolling mill row and control method of steel throwing distance thereof

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Application publication date: 20131218