CN107520258B - The test method of cold rolling mill motor losses torque coefficient - Google Patents
The test method of cold rolling mill motor losses torque coefficient Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
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Abstract
The present invention relates to the test method of a kind cold rolling mill motor losses torque coefficient, this method is by obtaining milling train alternating current motor design parameter, calculating the power factor of motor multiplied by efficiency value cos α × η；It tests the confirmation of preceding milling train working condition, be applied to the roll-force of fixed number value, milling train motor losses torque coefficient g is obtained by regression formulaL0‑gL4.By parameters such as actual measurement roll-force, the speed of rolls, motor voltage, motor currents, and consider that motor running efficiency is lost, the motor losses torque of calculating is more accurate.For determining the theory return model of motor losses torque coefficient, the independent variable and polynomial construction of selection are more reasonable, guarantee the on-line prediction accuracy error rate of motor losses torque within 10%.It the composite can be widely applied in single chassis or the motor losses Calculating Torque during Rotary of multi-frame cold continuous rolling, there is certain popularizing value.
Description
Technical field
The present invention relates to a kind of test methods, and in particular to a kind of test side of cold rolling mill motor losses torque coefficient
Method belongs to cold rolling technical field.
Background technique
The torque that motor generates during cold rolling is made of three parts: roll torque, tension torque and loss
Torque.Roll torque is formed by frictional force, roll flattening etc.；Tension torque is to be formed by the tension variation before and after rack, and damage
Losing torque is formed by mechanical loss generated during stable rolling.Mechanical loss mainly includes roll bearing and transmission
Additional friction torque that the equipment such as mechanism are generated due to friction and when overcoming roll and each rotatable parts zero load of transmission system
Moment of friction.
The theoretical calculation of bearing, gearing friction torque and unloading torque that classical rolling therory is related to is extremely complex, needs
Torque needed for calculating each roll bearing and rotatable parts, scene are difficult to apply.Another measurement method is motor in zero load
When being pressed against rotation, loss torque is extrapolated by surveying motor output power.Because of the roll torque of state and tension power at this time
Square is zero, and the output power of cold rolling motor is wasted power.During practical stable rolling, due to roll-force, rolling speed
Degree be it is continually changing, the loss torque of the operation of rolling is not fixed value, how to choose suitable independent variable establish it is a set of reliable
Regression model be very important.
Chinese invention patent " prediction technique of power of motor during a kind of cold rolling " (patent of invention number:
201510367889.1 Authorization Notice No.: CN 104998913A) disclose a kind of prediction of power of motor during cold rolling
Method.This method carries out the test of Cold rolling motor power loss, obtains the loss of Cold rolling motor mechanical output and roll-force, mill speed
Between relationship, and calculate Cold rolling motor mechanical output loss；The rolling power being calculated, Cold rolling motor mechanical output are damaged
Consumption summation obtains power of motor prediction result during cold rolling.
Regression model is lost in the motor mechanical output that above-mentioned prior art provides, and the independent variable provided is work rolling
Roller revolving speed and roll-force, model calculation formula is simpler, lacks the support of theoretical formula.Following theoretical formula consumes when being rolling
Function and roll torque between relational expression.
In formula, A is the function consumed when rolling；Q is corner of the rolled piece by roll during roll；V is the speed of rolls；R is
Roller radius；T is the time.
Above formula shows that the function and the speed of rolls, roller radius that consume when rolling are related.And prior art provides back
The independent variable of model is returned to lack this key factor of roller radius.Roll in the practical operation of rolling, after each roll change period
Radius is all different, and as the grinding roller radius of roll gradually becomes smaller, until scrapping.This meter for motor losses torque
It is very important at last.
Summary of the invention
The present invention exactly for the technical problems in the prior art, provides a kind of cold rolling mill motor losses torque system
Several test methods, this method accurately measure motor losses torque coefficient.
To achieve the goals above, technical scheme is as follows, a kind of cold rolling mill motor losses torque coefficient
Test method, which is characterized in that the described method comprises the following steps:
Step 1 obtains milling train alternating current motor design parameter, including rated power, voltage rating, amount electric current, specified turn
Speed, maximum speed, gear ratio；
Step 2, known nominal power, voltage rating, amount electric current, according to formula, calculate the power factor of motor multiplied by
Efficiency value cos α × η；
In formula: V is voltage rating, V；I is rated current, A；Cos α is power factor, and η is efficiency value；Kw is specified function
Rate, KW；
Step 3, the confirmation for testing preceding milling train working condition, the confirmation including the following conditions:
1) it is guarantee test mode closer to normal as-rolled condition, needs to guarantee that roll is under Warm status；
2) roll should choose representational size, because roller diameter has certain use scope, avoid using roll
Roll of the diameter close to lower limit；
3) excision of bending roller force function, coming into operation for bending roller force can have an impact roll-force in test process, thus
The accuracy of influence of rolled force data；
4) ensure roll-force, mill speed, roll gap adjustment function normal operation；
Step 4, the roll-force for being applied to fixed number value keep roll gap to fix, roll are allowed to operate under different rotating speeds, to be rolled
When power, roll rotational speed are constant, roll-force, the speed of rolls, motor voltage and the motor current under the speed point are acquired.Frequency acquisition
Generally 0.5 second, speed point is acquired up to 10 groups, the maximum speed of selection will reach the maximum speed of design, be scattered in simultaneously
Different speed intervals；
Step 5, because the data volume of high frequency acquisition it is larger, need to screen suitable data, choose under each speed point continuous
Ten groups of acquisition parameter takes its average value, as one group of data for regression analysis；
Step 6 calculates 10 groups of data after screening loss torque；
Step 7 returns to obtain milling train motor losses torque coefficient g by following formulaL0-gL4；
In formula: P is roll-force, ton；V is the speed of rolls, mpm；R is roller radius, mm；gL0For motor losses torque coefficient
Constant term；gL1-gL3For motor losses torque coefficient relevant to the speed of rolls, roller radius；gL4For horse relevant to roll-force
Up to loss torque coefficient；
Step 8, the g for obtaining recurrenceL0-gL4It is saved in memory constant table, determines final cold rolling motor losses power
Regression model, i.e., when the cold rolling motor losses power of forebay and the working roll speed of rolls, working roll roller radius, roll-force it
Between functional relation.
As an improvement of the present invention, the step 6,10 groups of data after screening are calculated with loss torque, it is specific to walk
It is rapid as follows:
Step 6-1, it because the efficiency of motor running is lossy, does not act in the speed of rolls all, needs to pass through actual measurement
The speed of rolls calculates motor actual speed；
In formula: nrFor motor rotary speed, rpm；V is the speed of rolls, mpm；R is working roll radius, mm；GrFor gear ratio.
Step 6-2, motor losses power K is calculatedl, cos α × η finds out in step 2；
In formula: VlFor virtual voltage, V；IlFor actual current, A；KlFor wasted power, KW.
Step 6-3, motor losses torque G is calculatedL；
In formula: R is working roll radius, mm；V is the speed of rolls, mpm；GLTo lose torque, kgmm.
Compared with the existing technology, the test method of motor losses torque coefficient provided by the invention rolls operating condition close to practical
Condition by parameters such as actual measurement roll-force, the speed of rolls, motor voltage, motor currents, and considers that motor running efficiency is lost,
The motor losses torque of calculating is more accurate.For determining the theory return model of motor losses torque coefficient, the independent variable of selection
It is more reasonable with polynomial construction, guarantee the on-line prediction accuracy error rate of motor losses torque within 10%.The present invention can
It is widely used in single chassis or the motor losses Calculating Torque during Rotary of multi-frame cold continuous rolling, there is certain popularizing value.
Detailed description of the invention
Fig. 1 is milling train motor losses torque coefficient test method flow chart of the present invention.
Fig. 2 is the curve graph that the present invention one rack high-frequency data of actual measurement is drawn.
Fig. 3 is the comparison diagram that one frame motor of the present invention loses torque match value and measured value.
Specific embodiment:
In order to deepen the understanding of the present invention, the present embodiment is described in detail with reference to the accompanying drawing.
Embodiment 1: referring to Fig. 1, a kind of test method of cold rolling mill motor losses torque coefficient, which is characterized in that institute
State method the following steps are included:
Step 1 obtains milling train alternating current motor design parameter, including rated power, voltage rating, amount electric current, specified turn
Speed, maximum speed, gear ratio；
Step 2, known nominal power, voltage rating, amount electric current, according to formula, calculate the power factor of motor multiplied by
Efficiency value cos α × η；
In formula: V is voltage rating, V；I is rated current, A；Cos α is power factor, and η is efficiency value；Kw is specified function
Rate, KW；
Step 3, the confirmation for testing preceding milling train working condition, including roll are under Warm status；Roll is chosen representative
Size；Bending roller force is not added；The functional test of roll-force, mill speed, roll gap adjustment is completed；
Step 4, the roll-force for being applied to fixed number value keep roll gap to fix, roll are allowed to operate under different rotating speeds, to be rolled
When power, roll rotational speed are constant, roll-force, the speed of rolls, motor voltage and the motor current under the speed point are acquired.Frequency acquisition
It is 0.5 second, acquires speed point up to 10 groups, the maximum speed of selection will reach the maximum speed of design, while be scattered in difference
Speed interval；
Step 5, because the data volume of high frequency acquisition it is larger, need to screen suitable data, choose under each speed point continuous
Ten groups of acquisition parameter takes its average value, as one group of data for regression analysis；
Step 6 calculates 10 groups of data after screening loss torque,
Step 7 returns to obtain milling train motor losses torque coefficient g by following formulaL0-gL4；
In formula: P is roll-force, ton；V is the speed of rolls, mpm；R is roller radius, mm；gL0For motor losses torque coefficient
Constant term；gL1-gL3For motor losses torque coefficient relevant to the speed of rolls, roller radius；gL4For horse relevant to roll-force
Up to loss torque coefficient；
Step 8, the g for obtaining recurrenceL0-gL4It is saved in memory constant table, determines final cold rolling motor losses power
Regression model, i.e., when the cold rolling motor losses power of forebay and the working roll speed of rolls, working roll roller radius, roll-force it
Between functional relation.
As an improvement of the present invention, the step 6,10 groups of data after screening are calculated with loss torque, it is specific to walk
It is rapid as follows:
Step 6-1, it because the efficiency of motor running is lossy, does not act in the speed of rolls all, needs to pass through actual measurement
The speed of rolls calculates motor actual speed；
In formula: nrFor motor rotary speed, rpm；V is the speed of rolls, mpm；R is working roll radius, mm；GrFor gear ratio.
Step 6-2, motor losses power K is calculatedl, cos α × η finds out in step 2；
In formula: VlFor virtual voltage, V；IlFor actual current, A；KlFor wasted power, KW.
Step 6-3, motor losses torque G is calculatedL；
In formula: R is working roll radius, mm；V is the speed of rolls, mpm；GLTo lose torque, kgmm.
Application Example: present embodiment is the six roller UCM milling trains progress for certain five Stands Cold Tandem Mill group of 1420mm
Test, each rack have been all made of same procedure test and have returned motor losses torque coefficient.
First obtain milling train alternating current motor design parameter, including rated power, voltage rating, amount electric current, rated speed,
Maximum speed, gear ratio calculate the power factor of motor multiplied by efficiency value cos α × η, as shown in table 1.
1 milling train alternating current motor design parameter table of table and cos α × η calculated value
Preparation before starting test.Roll is set to dally with low velocity before test, so that roll and motor are in heat
Under state, state when guaranteeing test mode and normal rolling is essentially identical.Apply roll-force extremely under the premise of cutting off bending roller force
700 tons or so, respectively with 120rpm, 240rpm, 360rpm, 480rpm, 600rpm, 720rpm, 840rpm, 960rpm,
1080rpm, 1200rpm are stepped up roll rotational speed, and each invariablenes turning speed 30 seconds or more, while acquiring the roll speed of 5 racks
Degree, roll-force, motor voltage, motor current data.
Fig. 2 show the curve graph of rack high frequency measured data drafting, needs at the high-frequency data to acquisition
Reason rejects the data acquired during acceleration and deceleration, chooses continuous ten groups under each speed point of data, takes roll-force, motor electricity
The average value of pressure, motor current, one group of data as regression analysis.Same method completes ten groups of data of ten speed points.
Processing result such as table 2.
2 one racks of table lose torque coefficient test data
According to motor losses Calculating Torque during Rotary formula, calculateWith roll-force P together as independent variable,
Torque is lost as dependent variable, regression analysis obtains milling train motor losses torque coefficient gL0-gL4, it is shown in Table 3.
gL0=-931024, gL1=857038, gL2=-211086, gL3=4495.184, gL4=961.8449.
3 one racks of table lose torque coefficient regression analysis data
The g that recurrence is obtainedL0-gL4It is saved in memory constant table, determines that final cold rolling motor losses power returns mould
Type, i.e., when the cold rolling motor power loss of forebay and working roll roll rotational speed, roll-force, the letter between working roll roller radius
Number relationship.
The cold rolling motor losses torque coefficient of the rack is read from configuration file, calculates motor losses torque match value,
As shown in table 4, Fig. 3, it is seen that loss torque precision of prediction deviation ratio meets on-line prediction required precision within 10%.
4 one frame motor loss torque match values of table and accuracy error rate
It should be noted that above-described embodiment, is not intended to limit the scope of protection of the present invention, in above-mentioned technical proposal
On the basis of made equivalents or substitution each fall within the range that the claims in the present invention are protected.
Claims (2)
1. a kind of test method of cold rolling mill motor losses torque coefficient, which is characterized in that the described method comprises the following steps:
Step 1 obtains milling train alternating current motor design parameter, including rated power, voltage rating, amount electric current, rated speed, most
High revolving speed, gear ratio；
Step 2, known nominal power, voltage rating, amount electric current calculate the power factor of motor multiplied by efficiency according to formula
Value cos α × η；
In formula: V is voltage rating, V；I is rated current, A；Cos α is power factor, and η is efficiency value；Kw is rated power,
KW；
Step 3, the confirmation for testing preceding milling train working condition, including roll are under Warm status；Roll chooses representational ruler
It is very little；The functional test of roll-force, mill speed, roll gap adjustment is completed；
Step 4, the roll-force for being applied to fixed number value keep roll gap to fix, roll are allowed to operate under different rotating speeds, power to be rolled,
When roll rotational speed is constant, roll-force, the speed of rolls, motor voltage and the motor current under the speed point are acquired, frequency acquisition is
0.5 second, speed point is acquired up to 10 groups, the maximum speed of selection will reach the maximum speed of design, while be scattered in different speed
Spend section；
Step 5, because high frequency acquisition data volume it is larger, need to screen suitable data, choose under each speed point continuous ten groups
Acquisition parameter, its average value is taken, as one group of data for regression analysis；
Step 6 calculates 10 groups of data after screening loss torque,
Step 7 returns to obtain milling train motor losses torque coefficient g by following formulaL0-gL4；
In formula: P is roll-force, ton；V is the speed of rolls, mpm；R is roller radius, mm；gL0For motor losses torque coefficient constant
?；gL1-gL3For motor losses torque coefficient relevant to the speed of rolls, roller radius；gL4For motor relevant to roll-force damage
Lose torque coefficient；GLFor motor losses torque；
Step 8, the g for obtaining recurrenceL0-gL4It is saved in memory constant table, determines that final cold rolling motor losses power returns
Model, i.e., when between the cold rolling motor losses power of forebay and the working roll speed of rolls, working roll roller radius, roll-force
Functional relation.
2. the test method of cold rolling mill motor losses torque coefficient according to claim 1, which is characterized in that the step
Rapid 6, loss torque is calculated to 10 groups of data after screening, the specific steps are as follows:
Step 6-1, it because the efficiency of motor running is lossy, does not act in the speed of rolls all, needs by surveying roll
Speed calculates motor actual speed；
In formula: nrFor motor rotary speed, rpm；V is the speed of rolls, mpm；R is working roll radius, mm；GrFor gear ratio；
Step 6-2, motor losses power K is calculatedl, cos α × η finds out in step 2；
In formula: VlFor virtual voltage, V；IlFor actual current, A；KlFor wasted power, KW；
Step 6-3, motor losses torque G is calculatedL；
In formula: R is working roll radius, mm；V is the speed of rolls, mpm；GLTo lose torque, kgmm.
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| CN108984836B (en) * | 2018-06-12 | 2022-12-02 | 中冶南方工程技术有限公司 | Method for calculating rolling loss torque |
| CN110146810B (en) * | 2019-04-23 | 2021-09-10 | 瑞声科技(新加坡)有限公司 | Method and device for determining test parameters of linear motor |
| CN112179551B (en) * | 2020-08-20 | 2021-06-22 | 清华大学 | Synchronous testing method and device for torque coefficient and friction force of joint motor of robot |
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| JPH07314025A (en) * | 1994-05-27 | 1995-12-05 | Toshiba Corp | Device for controlling speed of shape roll |
| KR20100011678A (en) * | 2008-07-25 | 2010-02-03 | 현대제철 주식회사 | Apparatus and method for controlling motors in roller-table for transferring fail goods |
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