CN101091967A - Method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill - Google Patents
Method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill Download PDFInfo
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- CN101091967A CN101091967A CN 200710201291 CN200710201291A CN101091967A CN 101091967 A CN101091967 A CN 101091967A CN 200710201291 CN200710201291 CN 200710201291 CN 200710201291 A CN200710201291 A CN 200710201291A CN 101091967 A CN101091967 A CN 101091967A
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Abstract
The invention discloses a cold-rolling mill HC rolling mill strip steel online roll changing and roll gap demarcating method that includes the following steps: a. according to request, haulling out old roller and installing new roller; starting new/old roller diameter bias compensating function; starting roll gap demarcating function; until rolling load is less than 50t, finishing demarcating. The invention has the advantages of simple technology, high reliability, and could save the time of changing roller. It also improves the reliability and practicability of online roller-changing.
Description
Technical field
The present invention relates to cold rolling mill milling train field, particularly relate to a kind of cold rolling mill HC milling train and be with online roll change field.
Background technology
At present, acid roll online after, mill roll can only adopt online roll change, because the frame internal memory can't carry out the roll gap location position according to the absolute mark roller mode before online at the band steel during roll change.For the position that guarantees roll change front and back roll gap does not change, the general routine mark roller relatively that adopts, be to carry out the roll gap memory function of mark roller relatively before the roll change, automatically the roll-force of roll change frame be pressed onto the roll-force (being generally 300t) of prior setting, store current roll gap then; The roll gap restore funcitons is carried out in the roll change back that finishes, and roll gap is returned to the roll gap of the storage before the roll change, thereby keeps the invariant position of roll gap before and after the roll change.Though the method can be finished the calibrating function of roll gap, but in actual motion, in order to guarantee the reliability and the control accuracy of roll gap storage, when carrying out roll gap storage and restore funcitons, do not allow to operate any equipment, and owing to there is continuous steel tape in 1～4# frame roll gap zone when roll change, if to carrying out the roll change that roll gap calibration can influence other frame when forebay, other frame that is in the roll change state also can influence the demarcation of current frame roll gap simultaneously, thereby need control the roll-changing equipment of 1～4# frame during the online roll change of four stand mill simultaneously, as long as wherein any one frame does not satisfy condition, all need all the other roll change frames to wait for, in addition owing to the people causes online roll change to carry out for maloperation or equipment reason, then will cause roll gap storage data to make mistakes, the roll gap that can't carry out online roll change recovers, have only steel band cut off this moment and carry out non-online roll change, increased absolute mark roller and the band steel is worn operations such as band, these have all increased roll changing time.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill that can effectively reduce the mill roll time.
The technical solution adopted for the present invention to solve the technical problems is:
1, method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill is characterized in that: the steps include:
A, according to the roll change demand, haul out the old roller new roller of packing into, finish more changing jobs of roll;
After b, roll are changed and finished, start new/old roller footpath difference compensation function;
C, startup roll gap calibration function;
D, open roll gap to roll-force less than 50t, the mark roller finish.
Described new, old roller footpath difference compensation function, its process is: after single roll change frame is finished the roll change process, start the roll gap deviation compensation, according to newly/the roller footpath of old roll is different, calculate the difference in roller footpath, according to the roller footpath difference that calculates gap values between rollers is compensated then.
Described new/old roller footpath difference compensation function increases the chain condition of roller footpath deviation compensation control.
Described roll gap calibration function, its process is: the special purpose model machine of request milling train is rolled the calculating of rules, result of calculation according to prototype, roll gap is pressed against the desired roll-force of rolling procedure that prototype calculates, and (this roll-force is according to the practical condition difference, roll-force is also different, generally about 4000KN～12000KN), calculate the side-play amount of roll gap automatically, current roll gap is revised as the roll gap that prototype calculates, keeps the roll gap physical location constant simultaneously.
Described roll gap calibration function increases corresponding roll gap and revises the interlocking condition.
In sum, the present invention is because the time milling train second-level model computer data that roll gap adopts when recovering, prototype has been considered roller footpath, roll change front and back difference, roller heat convex degree learning, the isoparametric variation of oil film thickness when calculating, therefore at the roll gap of demarcating relatively near the roll gap under the virtual condition, the precision that roll gap recovers is higher than the conventional roller of mark relatively far away.Simultaneously owing to do not need to carry out again roll gap storage and recovery, method of operating is simple, reliability is higher, can save roll changing time, and the influence that can avoid again maloperation in the line roll change process or plant issue that roll gap is recovered, owing to there is not the constraint of the conventional roller of mark relatively, the roll change of each frame can arbitrarily be carried out, increase the flexibility of roll change, improved the reliability and the practicality of online roll change.
Description of drawings
Below in conjunction with drawings and Examples the present invention is described in further detail
Fig. 1 is method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill of the present invention mill roll-gap schematic diagram under normal steel rolling state.
Fig. 2 is method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill of the present invention mill roll-gap schematic diagram under the roll change state.
Figure 1 shows that the schematic diagram of mill roll-gap under the normal steel rolling state, gap values between rollers is because different rolling thicknesses and difference, the lower roll surface of top working roll is in the rolling line position forever, and different roller footpath is by the twitch plate of frame top, tiltedly carve and adjust, and the roll line position is constant all the time.
Figure 2 shows that mill roll-gap schematic diagram under the roll change state, its gap values between rollers δ is the gap values between rollers δ when definitely marking roller
0, bottom working roll 3 and rolling line 4 apart from δ
1, bottom working roll 3 and following intermediate calender rolls 2 apart from δ
2, down between intermediate calender rolls 2 and the backing roll 1 apart from δ
3Sum (δ=δ
0+ δ
1+ δ
2+ δ
3).During design, the zero point of mill roll-gap is non-vanishing, and it is a setting value, and this setting value is the gap values between rollers δ when definitely marking roller
0
The specific embodiment
The step of cold rolling mill method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill is: 1, according to the roll change requirement, haul out the old roller new roller of packing into, finish more changing jobs of roll; 2, after roll is changed and to be finished, start new/old roller footpath difference compensation function, according to newly/difference of old roll diameter of roller, automatically gap values between rollers is compensated; 3, start roll gap calibration, current roll gap is revised as prototype calculates roll gap, keep the roll gap physical location constant simultaneously; 4, open roll gap and arrive roll-force less than 50t, the mark roller finishes.
New/old roller footpath the difference compensation function that is increased, be after avoiding big roller to change pony roll, after roll gap presses against zero, upper working rolls and lower working rolls is not also drawn close, mill roll-gap is represented is the roller footpath that distance between main hydraulic cylinder top and the roll line deducts working roll, intermediate calender rolls, backing roll again, after big roller changes pony roll, the numerical value of control system record roll gap is constant, but because the roller of new roll directly diminishes, cause actual roll gap to become big, when upwards pressing roll gap, after the roll gap vanishing of control system record, actual roll gap does not reach zero-bit.After single roll change frame is finished the roll change process, start the roll gap deviation compensation, according to newly/and the difference of old roll diameter of roller, automatically gap values between rollers is compensated.The new roller frame of having packed into when starting deviation compensation, and the deviation of new and old roll diameter of roller calculate must be accurately, the mistake under the situation such as will prevent only roll to be extracted out inspection simultaneously and then pack into compensates.
Increase the interlocking condition of roller footpath deviation compensation control simultaneously, avoid error starting at non-roll change state bottom roll roller footpath difference compensation function.So-called interlocking condition just is meant the sufficient and necessary condition that activates the deviation compensation control of roller footpath, mainly contain that frame must be in the roll change state, new roller has installed to the position, data under the roller state that makes new advances have been calculated in new roller and old roller roller footpath input model, model, after this all conditions must all satisfy, just possesses the condition that starts roller footpath deviation compensation control function.
Roll gap calibrating function under the online roll change state of the milling train that is increased, after being the roll gap calibration program start, the side-play amount of the current roll gap that calculates according to the roll gap control system is revised as prototype with current gap values between rollers automatically and calculates gap values between rollers, keeps the roll gap physical location constant simultaneously.
Increase corresponding roll gap simultaneously and revise the interlocking condition, avoid the error starting of roll gap calibrating function under non-roll change state.
The rolling procedure that parameter after the present invention adopts the mill model machine according to roll change is calculated, the roll gap of corresponding frame is pressed against the roll-force of correspondence according to the roll-force of rolling procedure requirement, then the roll gap control system automatically calculate current roll gap and model value between side-play amount, prototype has considered to influence factors such as the belt steel thickness, roller heat convex degree learning, backing roll oil film thickness of roll gap when calculating, therefore roll gap recovers the precision height, and do not need to rotate roll, just in time satisfy the requirement of online roll change.In addition, when finding that roll gap recovers mistake to occur, can shut down at any time, carry out roll gap once more and recover.
Embodiment one: during roll change, control system according to roll change before the roller of old roller directly to calculate the gap values between rollers δ that needs open be 156mm, gap values between rollers is δ=δ
0+ δ
1+ δ
2+ δ
3, when with diameter Ф
1Be replaced by roller for the big roller of 415mm and directly be Ф
2During the pony roll of 395mm, roller footpath deviation is Ф
Δ=Ф
1-Ф
2=20mm, this moment, the gap values between rollers δ of control system record did not become 156mm, but actual roll gap δ ' since after the roll change roll diameter of roller reduce to increase to δ+Ф
ΔIf do not carry out the roll deviation compensation this moment, when roll gap is closed to zero, also there is the slit of 10mm in=156mm+20mm=176mm between the up-down rollers, therefore must carry out roller footpath deviation compensation, and the gap values between rollers after the compensation is δ '=δ+Ф
Δ=(δ
0+ δ
1+ δ
2+ δ
3)+(Ф
1-Ф
2), the roller footpath deviate according to new/old roll after roll change finishes is revised the gap values between rollers that writes down in the control system, and the gap values between rollers that control system writes down is revised for 176mm by 156mm.
Embodiment two: δ is opened to 156mm as the roll change gap values between rollers, when with diameter Ф
1Be replaced by roller for the pony roll of 400mm and directly be Ф
2415mm change big roller the time, roller footpath deviation is Ф
Δ=Ф
1-Ф
2=15mm, the finish gap values between rollers δ of back control system record of roll change does not become 156mm, but actual gap values between rollers δ ' since after the roll change increase of roll diameter of roller be reduced to δ+Ф
Δ=156mm-15mm=141mm if do not carry out the roll deviation compensation this moment, when roll gap is closed to 15mm, draws close between the up-down rollers, therefore must carry out roller footpath deviation compensation, and the gap values between rollers after the compensation is δ '=δ+Ф
Δ=(δ
0+ δ
1+ δ
2+ δ
3)+(Ф
1-Ф
2), the roller footpath deviate according to new/old roll after roll change finishes is revised the gap values between rollers that writes down in the control system, and the gap values between rollers that control system writes down is revised as 141mm by 156mm.
As change a plurality of rolls, and its principle is identical with the principle of the single roll of above-mentioned replacing, and offset is the roller footpath deviate of the roll of all replacings.
When starting the roll gap calibration function, request mill model machine is rolled the calculating of rules, the result of hypothesized model computer is 8600KN, roll gap be 9200 microns (according to rolling different steel, it is worth different), then closing roll gap is 8600KN to roll-force, calculates current roll gap and prototype then and calculates side-play amount between the roll gap, automatically current roll gap is revised as 9200 microns of the roll gap that prototype calculates.
Claims (5)
1. method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill is characterized in that:
The steps include:
A, according to the roll change demand, haul out the old roller new roller of packing into, finish more changing jobs of roll;
After b, roll are changed and finished, start new/old roller footpath difference compensation function;
C, startup roll gap calibration function;
D, open roll gap to roll-force less than 50t, the mark roller finish.
2. method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill as claimed in claim 1, it is characterized in that: described new/old roller footpath difference compensation function, its process is, after single roll change frame is finished the roll change process, start the roll gap deviation compensation, according to newly/and the roller of old roll footpath is different, calculates the difference in roller footpath, according to the roller footpath difference that calculates gap values between rollers is compensated then.
3. method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill as claimed in claim 2 is characterized in that: described new/old roller footpath difference compensation function increases the chain condition of roller footpath deviation compensation control.
4. require described method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill as right 1, it is characterized in that: described roll gap calibration function, its process is: behind the roll gap calibration program start, the side-play amount of the current roll gap that calculates according to the roll gap control system, automatically current gap values between rollers is revised as prototype and calculates gap values between rollers, keep the roll gap physical location constant simultaneously.
5. method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill as claimed in claim 4 is characterized in that: described roll gap calibration function increases the interlocking condition that roll gap is revised.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007102012910A CN100518975C (en) | 2007-08-07 | 2007-08-07 | Method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007102012910A CN100518975C (en) | 2007-08-07 | 2007-08-07 | Method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101091967A true CN101091967A (en) | 2007-12-26 |
| CN100518975C CN100518975C (en) | 2009-07-29 |
Family
ID=38990504
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007102012910A Expired - Fee Related CN100518975C (en) | 2007-08-07 | 2007-08-07 | Method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill |
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| CN101947559A (en) * | 2010-09-28 | 2011-01-19 | 攀钢集团钢铁钒钛股份有限公司 | Method for calibrating vertical rolling centerline of universal mill |
| CN102039316B (en) * | 2009-10-10 | 2012-07-11 | 北京理工大学 | Zero-point calibration method for hot continuous rolling machine frame |
| CN102962262A (en) * | 2011-09-02 | 2013-03-13 | 鞍钢股份有限公司 | Roller change method avoiding damage of walking wheels of working roller |
| CN106269904A (en) * | 2015-05-27 | 2017-01-04 | 鞍钢股份有限公司 | A kind of scaling method of mill roll-gap |
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| CN106269904A (en) * | 2015-05-27 | 2017-01-04 | 鞍钢股份有限公司 | A kind of scaling method of mill roll-gap |
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| CN112170508A (en) * | 2020-09-09 | 2021-01-05 | 马鞍山钢铁股份有限公司 | Method for safely calibrating roll gap of hot rolling mill |
| CN112170508B (en) * | 2020-09-09 | 2022-05-17 | 马鞍山钢铁股份有限公司 | Method for safely calibrating roll gap of hot rolling mill |
| CN112474812A (en) * | 2020-11-10 | 2021-03-12 | 中冶陕压重工设备有限公司 | Movable track device in working roll changing machine |
| CN112658063A (en) * | 2020-11-19 | 2021-04-16 | 首钢京唐钢铁联合有限责任公司 | Installation precision control method for roller box supporting roller of straightening machine |
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| CP01 | Change in the name or title of a patent holder |
Address after: 617000 science and Technology Department, Xiangyang Village, East District, Sichuan, Panzhihua Patentee after: Pangang Group Steel Vanadium & Titanium Co., Ltd. Address before: 617000 science and Technology Department, Xiangyang Village, East District, Sichuan, Panzhihua Patentee before: Panzhihua New Steel & Vanadium Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090729 Termination date: 20160807 |