CN107597854B - The control method of reciprocal reversable mill passage load optimal - Google Patents
The control method of reciprocal reversable mill passage load optimal Download PDFInfo
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Abstract
The invention discloses a kind of control methods of reciprocal reversable mill passage load optimal, it is related to metal-pressed machine technical field, it bites failure method includes the following steps: process control model systems inspection goes out to exist and bites successful passage after having adjusted drafts, the drafts adjusted value for recording these passages, the drafts pre-calculated values as the rolling of next piece of same specification rolled piece；The rolling load situation for checking all rolling passes is modified rolling force model and current model according to mill capacity, or increases drafts pre-calculated values, substitutes into rolling force model again and calculates, to reach desired value；Drafts is redistributed, the drafts pre-calculated values after being optimized；Total rolling pass number and subsequent processing whether are reduced after checking adjusted several reduction in pass pre-calculated values.The present invention solves existing reciprocal reversable mill drafts adjustment heavy workload, is easy to appear a large amount of problem omitted with mistake.
Description
Technical field
The present invention relates to metal-pressed machine technical field, especially a kind of control of reciprocal reversable mill passage load optimal
Method processed.
Background technique
Currently, relatively advanced reciprocal reversable mill is generally fitted provided with process control model system.Process control model
The main function of system is exactly to set rolling procedure table, wherein the reduction settings of each rolling pass are most crucial parts.Pressure
Lower amount setting is excessive, it is possible that biting the problems such as difficult, roll-force is excessive and rolling torsion is excessive, roll-force crosses conference hair
Raw hydraulic cylinder drain charge, and rolling torsion is excessive, and main driving motor is caused to trip.Reduction settings are too small, then it is unnecessary to will increase
Rolling pass number, cause energy consumption to increase.Existing process control model system does not have also to be carried out certainly for drafts
The control means of dynamic optimization, all manually adjust certain its by technologist and think the drafts of unreasonable passage, but be based on
At present many factories receive orders be the more specifications of small lot status, the rolling procedure table of different product is different, each
The road number of rolling procedure table is that several to dozens of are differed again.Therefore, the workload of technologist's adjusting drafts is very big, difficult
Exempt from largely omission and mistake occur, brings huge loss to factory.
Summary of the invention
The object of the present invention is to provide a kind of control method of reciprocal reversable mill passage load optimal, this method can be with
Existing reciprocal reversable mill drafts adjustment heavy workload is solved, a large amount of problem omitted with mistake is easy to appear.
To solve the above-mentioned problems, the technical solution adopted by the present invention is that: this reciprocal reversable mill passage load optimal
Control method the following steps are included:
A, adjust drafts pre-calculated values: when completing the rolling of one piece of rolled piece, process control model systems inspection goes out to deposit
It is biting failure and is biting successful passage after having adjusted drafts, the drafts adjusted value of these passages is being recorded, under
Before one piece of same specification rolled piece is rolled, the initial depression amount pre-calculated values of these passages are adjusted to the drafts adjusted value,
And the difference of drafts adjusted value Yu initial depression amount pre-calculated values is calculated, obtain the offset for optimization；
B, according to mill capacity, optimize drafts pre-calculated values: having checked all rolling passes of the rolled piece of rolling
Rolling load situation, rolling load include roll-force and main transmission electric current；The passage of desired value is not up to practical rolling load,
Judge whether it is since deviation and not up to desired value occurs in model calculating, if it is, to rolling force model and current-mode
Type is modified, and is adjusted without the drafts pre-calculated values to these passages；If it is not, then further judgement is real
Whether border rolling load is that too small and not up to desired value is set due to drafts pre-calculated values, if it is, increasing the road
Secondary drafts pre-calculated values substitute into rolling force model again and calculate, constantly increase drafts pre-calculated values, then roll-force and electricity
The pre-calculated values of stream also increase, until stopping increasing drafts when precomputation roll-force or precomputation electric current reach desired value
Pre-calculated values；The drafts adjusted value for increasing the passage of drafts pre-calculated values is calculated, according to the initial depression amount of these passages
Calculated value, drafts adjusted value and offset redistribute the pressure for increasing the passage of drafts pre-calculated values in this step
Amount, the drafts pre-calculated values after being optimized；
C, subsequent processing: checking total rolling pass number, if total rolling pass number has not been changed, restores all and is adjusted
Drafts pre-calculated values to initial depression amount drafts pre-calculated values, if causing the reduction of total rolling pass number, under
When primary calculating rolling procedure table, the drafts pre-calculated values after optimizing are executed, the total road number of final rolling is finally calculated.
In the technical solution of the control method of above-mentioned reciprocal reversable mill passage load optimal, more specific technical solution is also
May is that the decision logic for biting failure are as follows: in the case where milling train is in rolling mode, when rolling force sensor detect roll-force by
Drift value increases to 300 tons or more, through being down to drift value from 300 tons again after a period of time, if the steering of whole process roll
Changed, is then determined as that the passage has occurred and bites failure；Bite successful decision logic are as follows: be in rolling die in milling train
Under formula, when rolling force sensor detects that roll-force increases to 300 tons or more by drift value, by certain time again from 300 tons
It is down to drift value, if the steering of whole process roll does not change, is determined as that the passage bites success.
Further, when determining that the passage bites successfully, check whether the drafts pre-calculated values of the passage have passed through
Adjustment, if it is expected that calculating gap values between rollers and surveying the difference of gap values between rollers greater than 1 millimeter, then it is assumed that drafts pre-calculated values are adjusted
It is whole, then the drafts adjusted value is recorded, if not needing to carry out any movement without adjustment；When to next piece of same rule
When lattice rolled piece is rolled, are there is biting failure in these first and has adjusted the passage of drafts and is found out, and by these passages
Drafts pre-calculated values be adjusted according to actual value.
Further, it is assumed that the maximum rolling force that milling train allows is Fmax, unit is ton；Actual measurement when rolling certain passage is rolled
Power processed is F, and unit is ton；The precomputation roll-force of the passage is Fset, unit is ton；The maximum electricity for the main transmission that milling train allows
Stream is Amax, unit is ampere；Measured current is A when rolling the passage, and unit is ampere；The precomputation electric current of the passage is
Aset, unit is ampere；Safety coefficient is λ, and the value range of safety coefficient λ is 0.8≤λ≤1；Check that all of the rolled piece roll
The practical rolling load situation of passage processed, as F < Fmaxλ and A < AmaxWhen λ, then need further to be judged as follows:
(1) judge to survey roll-force and measured current it is less than normal whether occurred since rolling force model and current model calculate
Caused by deviation；When checking Fset- F > 200 and AsetWhen-A > 100, copes with rolling force model and current model is modified,
Without being adjusted to drafts pre-calculated values；If not caused by model bias, that needs to continue to sentence into (2)
It is disconnected；
(2) judge survey roll-force and measured current it is less than normal whether be due to reduction settings it is too small caused by；Inspection is
It is no that there are Fmaxλ-Fset> 200 and Amaxλ-Aset> 100 the case where, if there is the situation, then explanation is implicitly present in pressure
Lower amount sets too small problem, at this time increases the drafts pre-calculated values of the passage, substitutes into roll-force and model and electricity again
Flow model is calculated, and drafts pre-calculated values are constantly increased, then the pre-calculated values of roll-force and electric current also increase, until Fset
=Fmaxλ or Aset=AmaxWhen λ, stop increasing drafts pre-calculated values.
Further, when producing the aluminium sheet of steel plate of the thickness less than 16 millimeters or thickness less than 20 millimeters, latter three
The drafts pre-calculated values of passage are not involved in adjustment.
By adopting the above-described technical solution, compared with prior art, the present invention has the following advantages: passing through process
The adjustment situation of Controlling model systems inspection drafts, capacity calculation further according to milling train simultaneously optimize rolling procedure table, realize road
The optimization of secondary load, during solving reciprocal rolled plate at present, drafts adjustment is easy to appear the problem of omission and mistake,
Reduce the workload of adjustment drafts.
Specific embodiment
Below with reference to embodiment, the invention will be further described:
The control method of the reciprocal reversable mill passage load optimal of the present embodiment the following steps are included:
Step A, drafts pre-calculated values are adjusted:
When completing the rolling of one piece of rolled piece, firstly, process control model systems inspection goes out the rolled piece during the rolling process,
Exist in i.e. all rolling passes and bite failure and bite successful passage after having adjusted drafts, records these passages
Drafts adjusted value；Bite the decision logic of failure are as follows: in the case where milling train is in rolling mode, roll when rolling force sensor detects
Power processed increases to 300 tons or more by drift value, through being down to drift value from 300 tons again after a period of time, if whole process roll
Steering changed, then be determined as that the passage has occurred and bite failure；Bite successful decision logic are as follows: be in milling train
Under rolling mode, when rolling force sensor detects that roll-force increases to 300 tons or more by drift value, by certain time again from
300 tons are down to drift value, if the steering of whole process roll does not change, are determined as that the passage bites success.When sentencing
When the fixed passage bites successfully, check whether the initial depression amount pre-calculated values of the passage have passed through the adjustment of technologist, such as
The difference of fruit precomputation gap values between rollers and actual measurement gap values between rollers is greater than 1 millimeter, then it is assumed that and initial depression amount pre-calculated values are adjusted,
The drafts adjusted value is then recorded, if not needing to carry out any movement without adjustment.It is rolled when to next piece of same specification
When part is rolled, there is into the passage for biting failure and having adjusted initial depression amount pre-calculated values by technologist in these first
It finds out, the drafts of these passages is adjusted according to the drafts adjusted value of technologist, and calculate drafts adjusted value
With the difference of initial depression amount pre-calculated values, the offset for optimization is obtained.The related data of specific rolling procedure table is such as
Shown in table 1, it is assumed that the original thickness of ingot casting or blank is 510 millimeters, and the target thickness of required rolling is 37 millimeters.According to stinging
Enter the decision logic of failure signal, wherein the 4th passage and the 6th passage have the case where biting unsuccessfully.Check the 4th passage and the 6th
Whether the precomputation gap values between rollers of passage and the difference of actual measurement gap values between rollers are greater than 1 millimeter, it can be found that the precomputation roll gap of the 4th passage
Value and the difference for surveying gap values between rollers are less than 1 millimeter, and the difference of the precomputation gap values between rollers of the 6th passage and actual measurement gap values between rollers is greater than
1 millimeter, therefore record the practical drafts of the 6th passage, the drafts precomputation as the 6th passage of rolling procedure table next time
Value, i.e. the drafts pre-calculated values of the 6th passage are adjusted to 41.3 millimeters by 42.7 millimeters.In the calculating of subsequent optimization, such as send out
Certain existing passage has that drafts pre-calculated values are less than normal, then offset compensation is entered, if the drafts of all passages
Pre-calculated values have reached maximum value or compensated rear beyond passage maximum reduction pre-calculated values allowed, then need to increase
A passage is added to complete the rolling of the drafts adjusted value.
Step B, according to mill capacity, optimize drafts pre-calculated values:
Assuming that the maximum rolling force that milling train allows is Fmax=2500 tons；Actual measurement roll-force when rolling certain passage is F, single
Position is ton；The precomputation roll-force of the passage is Fset, unit is ton；The maximum current for the main transmission that milling train allows is Amax=
2500 amperes；Measured current is A when rolling the passage, and unit is ampere；The precomputation electric current of the passage is Aset, unit is peace
Training；Safety coefficient is λ=0.8.Check all rolling passes of the rolled piece with the presence or absence of practical rolling load (roll-force and main biography
Streaming current) the case where being not up to desired value, that is, it whether there is F < Fmaxλ and A < AmaxThe case where λ.On inspection, the 1st, 7,
8,9,10,11,12,13,14,15,16 passages meet above situation, need further to judge these passages as follows:
(1) judge to survey roll-force and measured current (be not up to desired value) less than normal whether be due to rolling force model and
Current model calculating occurs caused by deviation.Check for Fset- F > 200 and AsetThe case where-A > 100, if there is
The situation, copes with rolling force model and current model is modified, to ensure the accuracy of pre-calculated values, without to initial
Drafts pre-calculated values are adjusted.If not caused by model bias, that needs to continue to judge into (2).On inspection
9th, 11,13 passages meet above situation, need to be modified the rolling force model and current model of these passages, without
Initial depression amount pre-calculated values are adjusted.1st, 7,8,10,12,14,15,16 passages need enter (2) continue to sentence
It is disconnected；
(2) judge to survey roll-force and measured current it is less than normal whether be since the setting of drafts pre-calculated values too small causes
's.Check for Fmaxλ-Fset> 200 and Amaxλ-Aset> 100 the case where, if there is the situation, then explanation is true
Real storage sets too small problem in drafts pre-calculated values, at this time increases the drafts pre-calculated values of the passage, substitutes into again
Roll-force and model and current model are calculated, and drafts pre-calculated values, the then precomputation of roll-force and electric current are constantly increased
Value also increases, until Fset=Fmaxλ or Aset=AmaxUntil λ, i.e. precomputation roll-force or precomputation electric current reaches the phase
When prestige value, stop increasing drafts pre-calculated values.On inspection, the 12nd, 14,15,16 passages meet above situation, need to increase this 4
The drafts of a passage, and the drafts pre-calculated values after increase are substituted into rolling force model and are calculated, until Fset=
Fmaxλ or Aset=AmaxUntil λ.
The drafts adjusted value for increasing the passage of drafts pre-calculated values is calculated, according to the initial depression meter of these passages
Calculation value, drafts adjusted value and offset redistribute the drafts for increasing the passage of drafts pre-calculated values in this step,
Drafts pre-calculated values after being optimized.It is computed, the drafts pre-calculated values of the 12nd passage are increased to by 17.7 millimeters
28.5 millimeters, the drafts pre-calculated values of the 14th passage increase to 22.3 millimeters by 11.6 millimeters, and the drafts of the 15th passage is pre-
Calculated value increases to 19.5 millimeters by 10.3 millimeters, and the drafts pre-calculated values of the 16th passage increase to 12.8 millis by 5.8 millimeters
Rice.The 6th reduction in pass pre-calculated values are adjusted, and after the drafts of 4 passages of increase, the overall reduction of rolled piece is by 473 millis
Rice increases to 510.7 millimeters, the drafts of 4 passages need to be re-started distribution.The sum of the drafts of 4 passages is
45.4 millimeters, firstly, since the drafts of the 12nd passage is no more than 45.4 millimeters, therefore it can be identified as 28.5 millimeters.Enable 4 roads
It is the sum of remaining unappropriated drafts that the sum of secondary drafts, which subtracts difference obtained by the drafts adjusted value of the 12nd passage, i.e.,
45.4-28.5=16.9 millimeters, considers that the 6th passage has 1.4 millimeters of unappropriated drafts due to biting unsuccessfully, enable 16.9+
1.4=18.3 millimeters, the drafts adjusted value due to the value less than the 14th passage, the pressure after can determine the 14th suboptimization
Lower amount pre-calculated values are 18.3 millimeters.Due to being only achieved that original needs 4 by increasing the drafts of the 12nd passage and the 14th passage
The drafts that a passage could be completed, the drafts pre-calculated values after optimization are as shown in table 1, original to need 16 passages complete
At rolling, be optimized for 14 passages now, saved 2 passages.
C, subsequent processing:
By step A and step B, it is possible to the initial depression amount pre-calculated values of wherein several passages are adjusted,
The reduction of total rolling pass number whether is caused by process control model systems inspection, if total rolling pass number has not been changed,
Restore all drafts pre-calculated values being adjusted to initial depression amount pre-calculated values, if causing total rolling pass number
It reduces, then when calculating rolling procedure table next time, the drafts pre-calculated values after executing optimization finally calculate final rolling
Total road number.
When producing steel plate of the thickness less than 16 millimeters, rear three passages are not involved in adjustment.When production thickness is less than 20 millis
When the aluminium sheet of rice, rear three passages are not involved in adjustment.In addition, when producing plate finished product, due to be carried out to the precision of thickness
Control, because hereafter three passages are not involved in adjustment.
Table 1
Claims (2)
1. a kind of control method of reciprocal reversable mill passage load optimal, it is characterised in that the following steps are included:
A, adjust drafts pre-calculated values: when completing the rolling of one piece of rolled piece, process control model systems inspection, which goes out to exist, is stung
Enter failure and bite successful passage after having adjusted drafts, the drafts adjusted value of these passages is recorded, to next piece
Before same specification rolled piece is rolled, the initial depression amount pre-calculated values of these passages are adjusted to the drafts adjusted value, and count
The difference for calculating drafts adjusted value and initial depression amount pre-calculated values, obtains the offset for optimization；
B, according to mill capacity, optimize drafts pre-calculated values: having checked the rolling of all rolling passes of the rolled piece of rolling
Load condition, rolling load include roll-force and main transmission electric current；It is not up to the passage of desired value to practical rolling load, judges
Whether it is since deviation and not up to desired value occurs in model calculating, is then to be repaired to rolling force model and current model
Just, it is adjusted without the drafts pre-calculated values to these passages；It is not that then further the practical rolling load of judgement is
No is that too small and not up to desired value is set due to drafts pre-calculated values, is the drafts precomputation for then increasing the passage
Value substitutes into rolling force model again and calculates, constantly increases drafts pre-calculated values, then the pre-calculated values of roll-force and electric current also increase
Greatly, until when precomputation roll-force or precomputation electric current reach desired value, stop increasing drafts pre-calculated values；It calculates and increases
The drafts adjusted value of the passage of drafts pre-calculated values is adjusted according to the initial depression amount calculated value of these passages, drafts
Value and offset redistribute the drafts for increasing the passage of drafts pre-calculated values in this step, the pressure after being optimized
Lower amount pre-calculated values；
C, it subsequent processing: checks that total rolling pass number, total rolling pass number have not been changed, then restores all drafts being adjusted
Pre-calculated values cause the reduction of total rolling pass number, then calculate rolling procedure table next time to initial depression amount pre-calculated values
When, the drafts pre-calculated values after executing optimization finally calculate the total road number of final rolling；
Bite the decision logic of failure are as follows: in the case where milling train is in rolling mode, when rolling force sensor detects roll-force by zero
Drift value increases to 300 tons or more, and through being down to drift value from 300 tons again after a period of time, the steering of whole process roll is had occurred
Variation, then be determined as that the passage has occurred and bite failure；Bite successful decision logic are as follows: in the case where milling train is in rolling mode,
When rolling force sensor detects that roll-force increases to 300 tons or more by drift value, zero is down to from 300 tons again by certain time
The steering of drift value, whole process roll does not change, then is determined as that the passage bites success；When judgement, the passage bites success
When, check whether the drafts pre-calculated values of the passage have passed through adjustment, it is contemplated that the difference for calculating gap values between rollers and actual measurement gap values between rollers is big
In 1 millimeter, then it is assumed that drafts pre-calculated values are adjusted, then record the drafts adjusted value, without adjustment, then not
It needs to carry out any movement；When being rolled to next piece of same specification rolled piece, these are occurred biting failure and be adjusted first
The passage of drafts is found out, and the drafts pre-calculated values of these passages are adjusted according to actual value；
The maximum rolling force that milling train allows is Fmax, unit is ton；Actual measurement roll-force when rolling certain passage is F, and unit is ton；
The precomputation roll-force of the passage is Fset, unit is ton；The maximum current for the main transmission that milling train allows is Amax, unit is peace
Training；Measured current is A when rolling the passage, and unit is ampere；The precomputation electric current of the passage is Aset, unit is ampere；Safety
Coefficient is λ, and the value range of safety coefficient λ is 0.8≤λ≤1；Check the practical rolling load of all rolling passes of the rolled piece
Situation, as F < Fmaxλ and A < AmaxWhen λ, then need further to be judged as follows:
(1) judge survey roll-force and measured current it is less than normal whether be due to rolling force model and current model calculating there is deviation
It is caused, when checking Fset- F > 200 and AsetWhen-A > 100, copes with rolling force model and current model is modified, without
It needs to be adjusted drafts pre-calculated values；It is not caused by model bias, that needs to continue to judge into (2)；
(2) judge survey roll-force and measured current it is less than normal whether be due to reduction settings it is too small caused by；It checks whether and deposits
In Fmaxλ-Fset> 200 and Amaxλ-Aset> 100 the case where, there are the situations, then explanation is implicitly present in reduction settings
Too small problem at this time increases the drafts pre-calculated values of the passage, substitute into again roll-force and model and current model into
Row calculates, and constantly increases drafts pre-calculated values, then the pre-calculated values of roll-force and electric current also increase, until Fset=Fmax·λ
Or Aset=AmaxWhen λ, stop increasing drafts pre-calculated values.
2. the control method of reciprocal reversable mill passage load optimal according to claim 1, it is characterised in that: work as production
When aluminium sheet less than 20 millimeters of steel plate of the thickness less than 16 millimeters or thickness, the drafts pre-calculated values of rear three passages are not joined
With adjustment.
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