CN112453071B - Method for predicting rolling force and thickness of each layer of cold-rolled metal composite plate - Google Patents

Method for predicting rolling force and thickness of each layer of cold-rolled metal composite plate Download PDF

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CN112453071B
CN112453071B CN202011284055.1A CN202011284055A CN112453071B CN 112453071 B CN112453071 B CN 112453071B CN 202011284055 A CN202011284055 A CN 202011284055A CN 112453071 B CN112453071 B CN 112453071B
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calculating
rolling force
plate blank
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CN112453071A (en
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郝平菊
王涛
王振华
刘元铭
刘文礼
和东平
王振国
黄庆学
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Taiyuan University of Technology
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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
    • B21B37/58—Roll-force control; Roll-gap control
    • 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

Abstract

The invention discloses a method for predicting rolling force and thickness of each layer of a cold-rolled metal composite plate, and belongs to the technical field of composite plate rolling. The method comprises the following steps: firstly, acquiring rolling technological parameters of the composite plate; setting the roll radius used by the soft metal and the hard metal plate blank in the rolling force calculation of the respective equivalent single plate rolling, and calculating the total reduction rate of the composite rolling, the reduction rate of the soft metal and the hard metal plate blank and the outlet thickness of the reduction rate in turn; rolling force when rolling the soft metal and the hard metal plate blank from the inlet thickness to the outlet thickness in equivalent single plate rolling; judging whether the rolling force meets the convergence condition, if not, recalculating until the convergence condition is met; obtaining the rolling force of the bimetal cold-rolled composite plate during production; and calculating the final outlet thickness of the soft metal and the hard metal plate blank. The method predicts the rolling force and the thickness of each layer of the cold-rolled metal composite plate, and the calculated values of the rolling force and the thickness of each layer are basically close to actual values.

Description

Method for predicting rolling force and thickness of each layer of cold-rolled metal composite plate
Technical Field
The invention relates to the technical field of composite plate rolling, in particular to a method for predicting the rolling force and the thickness of each layer of a cold-rolled metal composite plate.
Background
The metal layered composite material not only can save a large amount of rare precious metals, but also has the respective excellent characteristics of the base material and the multi-layer material, can meet the special requirements of different environments and use conditions, and is widely applied to various fields of electronic packaging, petrochemical engineering, ocean engineering, aerospace and the like. The rolling and compounding method is a typical layered metal compounding technology, has high production efficiency, is easy to realize batch production, can produce products with larger length and width, and has good product consistency and stable performance, so the rolling and compounding method is widely applied.
The determination of the rolling force in the composite plate rolling process can provide basis for rolling roll gap setting, plate shape control and the like, and can also guide the design of equipment and the check of strength, which has important significance for production safety and prolonging the service life of the equipment. The thickness precision of the metal composite plate is one of the main properties for evaluating the product quality, and the thickness of each layer of the rolled composite plate directly influences the subsequent deep processing property and the final comprehensive property of the product. The rolling force in the rolling process of the metal composite plate and the thickness of each layer after rolling are predicted, so that the production assembly and the rolling schedule setting can be guided, materials can be saved to the maximum extent, and rolling equipment can be reasonably utilized.
At present, physical experiment methods and finite element methods are commonly adopted for researching the rolling force and the thickness of each layer of the metal cold-rolled composite plate. But the physical experiment method has long test time, large economic loss, certain blindness and poor flexibility. The finite element method has long calculation time, and each calculation can only display the result of a specific process and is inconvenient for engineering application. Therefore, a method for predicting the rolling force and the thickness of each layer of the cold-rolled metal composite plate, which has the advantages of low cost, high precision, short calculation time and wide application range, is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for predicting the rolling force and the thickness of each layer of a cold-rolled metal composite plate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for predicting the rolling force and the thickness of each layer of a cold-rolled metal composite plate comprises the following steps:
step 1: respectively acquiring the rolling technological parameters of the composite plate according to the rolling technological schedule data of a certain pass, including the inlet thickness h of the soft metal plate blank1iInlet thickness h of hard metal slab2iSlab width b, target total thickness h of the finished composite slaboCoefficient of friction mu between a soft metal blank and a first roll in contact therewith1Coefficient of friction mu between a hard metal slab and a second roll in contact therewith2Original radius R of first roll in contact with soft metal sheet blank and second roll in contact with hard metal sheet blank0(ii) a Wherein the width of the plate blank is equal to the width of the soft metal plate blank and the hard metal plate blank; the original radii of the first roller and the second roller are equal.
Step 2: setting the roll radius R used in the rolling force calculation of the respective equivalent single-plate rolling of the soft metal plate blank and the hard metal plate blank1And R2First calculation of the roll radius R1And R2Is the original radius R of the roll0I.e. R1＝R0，R2＝R0；
And step 3: according to the inlet thickness h of the slab1iAnd h2iAnd target total thickness h of the finished productoCalculating the total rolling reduction rate epsilon of the composite rolling;
and 4, step 4: setting the reduction rate epsilon of the soft metal plate blank in the composite plate rolling1＝ε；
And 5: calculating the reduction rate epsilon of the hard metal plate blank in the composite plate rolling2；
Step 6: meterCalculating the reduction rate epsilon of the soft metal plate blank and the hard metal plate blank respectively1And ε2Lower outlet thickness h1oAnd h2o；
And 7: calculating the ratio of the length of the soft metal slab to the length of the sheet in the equivalent single-plate rolling1iRolling to h1oRolling force P ofd1；
And 8: calculating the ratio of hard metal slabs from h in equivalent single-slab rolling2iRolling to h2oRolling force P ofd2；
And step 9: calculating the respective equivalent roll flattening radius R 'of the soft metal plate blank and the hard metal plate blank in equivalent single plate rolling'1And R'2；
Step 10: judging the rolling force Pd1And Pd2Whether or not a convergence condition is satisfied
Figure BDA0002781754070000021
If not, recalculating the reduction epsilon of the soft metal plate blank1Resetting the roll radius R required in the rolling force calculation process1And R2Repeating the operations from the step 5 to the step 10 until the convergence condition is met;
step 11: obtaining the rolling force of the bimetal cold-rolled composite plate during production
Figure BDA0002781754070000022
Step 12: to obtain epsilon1And ε2Optimum value of (e)1 *And ε2 *Calculating the final outlet thickness h of the soft metal plate blank and the hard metal plate blank during the composite rolling1o *And h2o *。
Further, the step 3: according to the inlet thickness h of the slab1iAnd h2iAnd target total thickness h of the finished productoAnd calculating the total reduction rate epsilon of the composite rolling, specifically according to the formula (1):
Figure BDA0002781754070000023
still further, the step 5: calculating the reduction rate epsilon of the hard metal plate blank in the composite plate rolling2Specifically, the calculation is performed according to the formula (2):
Figure BDA0002781754070000024
further, the step 6: calculating the reduction rate epsilon of the soft metal plate blank and the hard metal plate blank respectively1And ε2Lower outlet thickness h1oAnd h2oCalculated according to equations (3) and (4), respectively:
h1o＝(1-ε1)h1i (3)
h2o＝(1-ε2)h2i (4)。
further, the step 7: calculating the ratio of the length of the soft metal slab to the length of the sheet in the equivalent single-plate rolling1iRolling to h1oRolling force P ofd1(ii) a The method specifically comprises the following steps:
step 7.1: calculation of the deformation resistance σ of a soft sheet metal blank1；
Step 7.2: calculating the ratio of the soft metal slab to the soft metal slab in the equivalent single-plate rolling according to the formula (5)1iRolling to h1oEquivalent contact arc length l of time deformation zone1；
Figure BDA0002781754070000031
Step 7.3: calculating the rolling force P of the soft metal plate blank in the equivalent single-plate rolling according to the formula (6)d1；
Figure BDA0002781754070000032
Further, the step 8: calculating the ratio of hard metal slabs from h in equivalent single-slab rolling2iRolling to h2oRolling force P ofd2(ii) a The method specifically comprises the following steps:
step 8.1: meterCalculation of the deformation resistance sigma of a hard metal slab2；
Step 8.2: calculating the ratio of the hard metal slab to the sheet metal slab in the equivalent single-plate rolling according to equation (7)2iRolling to h2oEquivalent contact arc length l of time deformation zone2；
Figure BDA0002781754070000033
Step 8.3: calculating the rolling force P of the hard metal plate blank in the equivalent single-plate rollingd2。
Further, the step 8.3: calculating the rolling force P of the hard metal plate blank in the equivalent single-plate rollingd2Specifically, it is calculated according to equation (8):
Figure BDA0002781754070000034
further, the step 9: calculating the respective equivalent roll flattening radii R 'of the soft metal plate blank and the hard metal plate blank in equivalent single-plate rolling'1And R'2；R'1And R'2Calculated according to equations (9) and (10), respectively: because the rolling force is larger during rolling, the roller generates an elastic flattening phenomenon, and the actual length of the contact arc is increased, so that the flattening of the roller is considered in the calculation process in order to improve the calculation accuracy of the contact arc length and the rolling force. Equivalent roll flattening radius R'1And R'2Comprises the following steps:
Figure BDA0002781754070000041
Figure BDA0002781754070000042
further, the step 10: judging the rolling force Pd1And Pd2Whether or not a convergence condition is satisfied
Figure BDA0002781754070000043
If not, recalculating the reduction epsilon of the soft metal plate blank1Resetting the roll radius R required in the rolling force calculation process1And R2Repeating the operations from the step 5 to the step 10 until the convergence condition is satisfied, specifically as follows:
ε1n is the number of loop calculations, and takes positive integers 1, 2, and 3 … …, and increases in order.
Each time the rolling force calculation is circulated to the step 7 and the step 8, the roll radius is recalculated to be the roll flattening radius, namely R is set1＝R1′，R2＝R2′。
Further, the step 12: to obtain epsilon1And ε2Optimum value of (e)1 *And ε2 *Calculating the final outlet thickness h of the soft metal plate blank and the hard metal plate blank during the composite rolling1o *And h2o *Specifically, it is calculated according to equations (11) and (12):
h1o *＝(1-ε1 *)h1i (11)，
h2o *＝(1-ε2 *)h2i (12)。
compared with the prior art, the invention has the following beneficial effects:
the method predicts the rolling force and the thickness of each layer of the cold-rolled metal composite plate, and the calculated values of the rolling force and the thickness of each layer are basically close to actual values. The method of the invention is safe and reliable, can simply, conveniently and accurately predict the rolling force and the thickness of each layer of the copper/aluminum, magnesium/aluminum and other metal cold-rolled composite plate under different rolling regulations, saves the production investment cost, facilitates the setting of the rolling regulations and the selection of equipment, and improves the precision of the thickness control of the composite plate product.
Drawings
FIG. 1 is a schematic flow chart of a method for predicting rolling force and thickness of each layer of a cold-rolled metal composite plate provided by the invention;
fig. 2 is a schematic rolling diagram of the cold-rolled metal composite plate provided by the invention.
In the figure, 1-soft metal plate blank, 2-hard metal plate blank, 3-first roller and 4-second roller.
Detailed Description
The technical scheme of the invention is further explained by the specific embodiment in combination with the attached drawings. It should be understood by those skilled in the art that the specific embodiments are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Fig. 1 shows a schematic flow chart of a method for predicting rolling force and thickness of each layer of a cold-rolled metal composite plate according to the present invention, where a soft metal plate blank 1 is an aluminum plate blank and a hard metal plate blank 2 is a copper plate blank, as shown in fig. 1, the method of this embodiment is as follows.
Step 1: respectively acquiring the rolling process parameters of the composite plate according to the rolling process specification data of a certain pass, including the inlet thickness h of the soft metal plate blank 11i2mm, inlet thickness h of the hard metal slab 22i1mm, 30mm of plate blank width b, and total outlet thickness h of copper-aluminum composite plateo1.51mm, coefficient of friction between the aluminum slab and the roll 3, mu10.4, coefficient of friction mu between copper slab and roll 420.35, original radius of roll R0＝75mm。
Step 2: setting the roll radius R used in the rolling force calculation of the respective equivalent single-plate rolling of the aluminum plate blank and the copper plate blank1And R2First calculation of roll radius R1And R2Is the original radius R of the roll0I.e. R1＝R0＝75mm，R2＝R0＝75mm。
And step 3: according to the inlet thickness h of the slab1iAnd h2iAnd target total thickness h of the finished productoAnd calculating the total reduction rate epsilon of the composite rolling.
Figure BDA0002781754070000051
And 4, step 4: setting composite boardReduction rate epsilon of aluminum slab in rolling1＝ε＝49.7％。
And 5: calculating the reduction rate epsilon of the copper plate blank in the composite plate rolling2。
Figure BDA0002781754070000052
Step 6: calculating the reduction rate epsilon of the aluminum plate blank and the copper plate blank respectively1And epsilon2Lower outlet thickness h1oAnd h2o。h1o＝(1-ε1)h1i＝0.503×2＝1.006mm，h2o＝(1-ε2)h2i＝0.503×1＝0.503mm。
And 7: calculating the ratio of the length of the aluminum slab to the length of the aluminum slab h in the equivalent single-plate rolling1iRolling to h1oHour rolling force Pd1。
Step 7.1: calculation of the resistance to deformation σ of aluminium1；
Figure BDA0002781754070000053
Step 7.2: calculating the ratio of the length of the aluminum slab to the length of the aluminum slab h in the equivalent single-plate rolling1iRolling to h1oEquivalent contact arc length l of time deformation zone1；
Figure BDA0002781754070000061
Step 7.3: calculating the rolling force P of the aluminum plate blank in the equivalent single-plate rollingd1；
Figure BDA0002781754070000062
And 8: calculating the ratio of the copper slab to the length h in the equivalent single-plate rolling2iRolling to h2oRolling force P ofd2。
Step 8.1: calculation of the deformation resistance σ of copper2；
Figure BDA0002781754070000063
Step 8.2: calculating the ratio of the copper slab to the length h in the equivalent single-plate rolling2iRolling to h2oEquivalent contact arc length l of time deformation zone2；
Figure BDA0002781754070000064
Step 8.3: calculating the rolling force P of the copper plate blank in the equivalent single-plate rollingd2；
Figure BDA0002781754070000065
And step 9: calculating the respective equivalent roll flattening radius R 'of the aluminum slab and the copper slab in equivalent single-plate rolling'1And R'2。
Figure BDA0002781754070000066
Figure BDA0002781754070000071
Step 10: judging the rolling force Pd1And Pd2Whether or not a convergence condition is satisfied
Figure BDA0002781754070000072
If not, recalculating the reduction rate epsilon of the aluminum slab1Resetting the roll radius R required in the rolling force calculation process1And R2And repeating the operations from the step 5 to the step 10 until the convergence condition is met.
This calculation is carried out when n is equal to 1, i.e. epsilon1＝ε+0.001n＝0.497+0.001×1＝49.8％。
Subsequent first loop calculationIn the case of the method, the roll radius used in step 7 and step 8 is calculated by using the flattened roll radius, that is, R is calculated1＝R1′＝81.863mm，R2＝R2′＝88.726mm。
Repeating the operations from the step 5 to the step 10, calculating 94 times again, meeting the convergence condition, stopping circulation, and circulating part of data in the calculation process as shown in the table below.
n ε1 ε2 h1o/mm h2o/mm Pd1/kN Pd2/kN R'1/mm R'2/mm
1 49.7％ 49.7％ 1.006 0.503 88.034 163.636 81.963 88.925
2 49.8％ 49.5％ 1.004 0.505 97.348 186.160 82.828 90.750
3 49.9％ 49.3％ 1.002 0.507 98.722 188.296 82.909 91.010
4 50.0％ 49.1％ 1.000 0.509 99.083 187.835 82.890 91.070
5 50.1％ 48.9％ 0.998 0.511 99.316 187.047 82.859 91.104
6 50.2％ 48.7％ 0.996 0.513 99.532 186.218 82.827 91.136
7 50.3％ 48.5％ 0.994 0.515 99.747 185.386 82.794 91.167
8 50.4％ 48.3％ 0.992 0.517 99.961 184.554 82.762 91.199
9 50.5％ 48.1％ 0.990 0.519 100.176 183.724 82.730 91.231
10 50.6％ 47.9％ 0.988 0.521 100.391 182.896 82.698 91.264
…… …… …… …… …… …… …… …… ……
85 58.1％ 32.9％ 0.838 0.671 117.283 125.119 80.737 95.262
86 58.2％ 32.7％ 0.836 0.673 117.521 124.404 80.716 95.345
87 58.3％ 32.5％ 0.834 0.675 117.758 123.691 80.695 95.430
88 58.4％ 32.3％ 0.832 0.677 117.996 122.979 80.674 95.516
89 58.5％ 32.1％ 0.830 0.679 118.234 122.268 80.653 95.604
90 58.6％ 31.9％ 0.828 0.681 118.473 121.559 80.632 95.692
91 58.7％ 31.7％ 0.826 0.683 118.712 120.852 80.612 95.782
92 58.8％ 31.5％ 0.824 0.685 118.952 120.145 80.591 95.874
93 58.9％ 31.3％ 0.822 0.687 119.191 119.440 80.571 95.966
94 59.0％ 31.1％ 0.820 0.689 119.432 118.737
Step 11: obtaining the rolling force when the cold-rolled copper-aluminum composite board is produced
Figure BDA0002781754070000073
Step 12: to obtain epsilon1And ε2Optimum value of (e)1 *And epsilon2 *，ε1 *＝0.59，ε2 *The final exit thickness h of the aluminum and copper sheets at clad-rolling was calculated as 0.3111o *And h2o *，h1o *＝(1-ε1 *)h1i＝0.82mm，h2o *＝(1-ε2 *)h2i＝0.689mm。
In the present embodiment, aluminum is used as the soft metal plate blank 1, and copper is used as the hard metal plate blank 2, which are not intended to limit the soft metal and the hard metal material of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. A method for predicting the rolling force and the thickness of each layer of a cold-rolled metal composite plate is characterized by comprising the following steps of:
step 1: respectively acquiring the rolling technological parameters of the composite plate according to the rolling technological schedule data of a certain pass, including the inlet thickness h of the soft metal plate blank (1)1iInlet thickness h of the hard metal slab (2)2iSlab width b, target total thickness h of the finished composite slaboCoefficient of friction mu between a soft metal blank (1) and a first roll (3) in contact therewith1The coefficient of friction mu between the hard metal slab (2) and the second roll (4) in contact therewith2The original radius R of a first roller (3) in contact with the soft metal slab (1) and a second roller (4) in contact with the hard metal slab (2)0；
And 2, step: setting the roll radius R used in the rolling force calculation of the respective equivalent single-plate rolling of the soft metal plate blank (1) and the hard metal plate blank (2)1And R2First calculation of the roll radius R1And R2Is the original radius R of the roll0I.e. R1＝R0，R2＝R0；
And step 3: according to the inlet thickness h of the slab1iAnd h2iAnd target total thickness h of the finished productoCalculating the total rolling reduction rate epsilon of the composite rolling;
and 4, step 4: setting the soft metal slab (1) in the rolling of clad slabsReduction rate ε1＝ε；
And 5: calculating the reduction rate epsilon of the hard metal plate blank (2) in the composite plate rolling2；
Step 6: calculating the reduction rate epsilon of the soft metal plate blank (1) and the hard metal plate blank (2) respectively1And epsilon2Lower outlet thickness h1oAnd h2o；
And 7: calculating the secondary h of a soft metal slab (1) in an equivalent single-plate rolling1iRolling to h1oRolling force P ofd1；
And 8: calculating the distance from h of a hard metal slab (2) in equivalent single-plate rolling2iRolling to h2oRolling force P ofd2；
And step 9: calculating the respective equivalent roll flattening radius R 'of the soft metal plate blank (1) and the hard metal plate blank (2) in equivalent single plate rolling'1And R'2；
Step 10: judging the rolling force Pd1And Pd2Whether or not a convergence condition is satisfied
Figure FDA0002781754060000011
If not, recalculating the reduction epsilon of the soft metal plate blank (1)1Resetting the roll radius R required in the rolling force calculation process1And R2Repeating the operations from the step 5 to the step 10 until the convergence condition is met;
step 11: obtaining the rolling force of the bimetal cold-rolled composite plate during production
Figure FDA0002781754060000012
Step 12: to obtain epsilon1And ε2Optimum value of (e)1 *And ε2 *Calculating the final outlet thickness h of the soft metal plate blank (1) and the hard metal plate blank (2) in the composite rolling1o *And h2o *。
2. The method of claim 1 wherein said rolling force and layer thickness prediction are based on the weight of said cold rolled metal composite sheetA method, characterized in that said step 3: according to the inlet thickness h of the slab1iAnd h2iAnd target total thickness h of the finished productoAnd calculating the total reduction rate epsilon of the composite rolling, specifically according to the formula (1):
Figure FDA0002781754060000021
3. the method of claim 1, wherein the step 5: calculating the reduction rate epsilon of the hard metal plate blank (2) in the rolling of the composite plate2Specifically, the calculation is performed according to the formula (2):
Figure FDA0002781754060000022
4. the method of predicting rolling force and thickness of each layer of a cold rolled metal composite plate according to claim 1, wherein said step 6: calculating the reduction rate epsilon of the soft metal plate blank (1) and the hard metal plate blank (2) respectively1And epsilon2Lower outlet thickness h1oAnd h2oCalculated according to equations (3) and (4), respectively:
h1o＝(1-ε1)h1i (3)
h2o＝(1-ε2)h2i (4)。
5. the method of predicting rolling force and thickness of each layer of a cold rolled metal composite plate according to claim 1, wherein said step 7: calculating the secondary h of a soft metal slab (1) in an equivalent single-plate rolling1iRolling to h1oRolling force P ofd1(ii) a The method specifically comprises the following steps:
step 7.1: calculating the deformation resistance sigma of the soft sheet metal blank (1)1；
Step 7.2: calculating on the equivalent single board according to the formula (5)In rolling, the soft metal plate blank (1) is rolled from h1iRolling to h1oEquivalent contact arc length l of time deformation zone1；
Figure FDA0002781754060000023
Step 7.3: calculating the rolling force P of the soft metal plate blank (1) in the equivalent single-plate rolling according to the formula (6)d1；
Figure FDA0002781754060000024
6. The method of claim 1, wherein the step 8: calculating the average thickness of the hard metal slab (2) in the equivalent single-slab rolling2iRolling to h2oRolling force P ofd2(ii) a The method specifically comprises the following steps:
step 8.1: calculating the deformation resistance sigma of a hard metal slab (2)2；
Step 8.2: calculating the ratio of the hard metal slab (2) to the sum of h in the equivalent single-plate rolling according to equation (7)2iRolling to h2oEquivalent contact arc length l of time deformation zone2；
Figure FDA0002781754060000031
Step 8.3: calculating the rolling force P of the hard metal plate blank (2) in the equivalent single-plate rollingd2。
7. The method of predicting rolling force and thickness of each layer of a cold rolled metal composite plate of claim 6, wherein said step 8.3: calculating the rolling force P of the hard metal plate blank (2) in the equivalent single-plate rollingd2Specifically, it is calculated according to equation (8):
Figure FDA0002781754060000032
8. the method of predicting rolling force and thickness of each layer of a cold rolled metal composite plate according to claim 1, wherein said step 9: calculating the equivalent roll flattening radius R 'of the soft metal plate blank (1) and the hard metal plate blank (2) in equivalent single-plate rolling'1And R'2；R'1And R'2Calculated according to equations (9) and (10), respectively:
Figure FDA0002781754060000035
Figure FDA0002781754060000033
9. the method of predicting rolling force and thickness of each layer of a cold rolled metal composite plate according to claim 1, wherein said step 10: judging the rolling force Pd1And Pd2Whether or not a convergence condition is satisfied
Figure FDA0002781754060000034
If not, recalculating the reduction epsilon of the soft metal plate blank (1)1Resetting the roll radius R required in the rolling force calculation process1And R2Repeating the operations from the step 5 to the step 10 until the convergence condition is satisfied, specifically as follows:
ε1n is the number of times of cycle calculation, and positive integers are taken and are sequentially increased;
each time the rolling force calculation is circulated to the step 7 and the step 8, the roll radius is recalculated to be the roll flattening radius, namely R is set1＝R1′，R2＝R2′。
10. The method of predicting rolling force and thickness of each layer of a cold rolled metal composite plate according to claim 1, wherein said step 12: to obtain epsilon1And ε2Optimum value of (e)1 *And ε2 *Calculating the final outlet thickness h of the soft metal plate blank (1) and the hard metal plate blank (2) in the composite rolling1o *And h2o *Specifically, it is calculated according to equations (11) and (12):
h1o *＝(1-ε1 *)h1i (11)，
h2o *＝(1-ε2 *)h2i (12)。
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