CN108268066B - Method for presetting and controlling coiling tension of strip steel finishing machine set - Google Patents

Method for presetting and controlling coiling tension of strip steel finishing machine set Download PDF

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CN108268066B
CN108268066B CN201810060106.9A CN201810060106A CN108268066B CN 108268066 B CN108268066 B CN 108268066B CN 201810060106 A CN201810060106 A CN 201810060106A CN 108268066 B CN108268066 B CN 108268066B
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strip steel
tension
unit
coiling
wrapper
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CN108268066A (en
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孙亚波
崔卫华
刘渭苗
李宏伟
马伟然
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China National Heavy Machinery Research Institute Co Ltd
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China National Heavy Machinery Research Institute Co Ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D15/00—Control of mechanical force or stress; Control of mechanical pressure
    • G05D15/01—Control of mechanical force or stress; Control of mechanical pressure characterised by the use of electric means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D17/00—Control of torque; Control of mechanical power
    • G05D17/02—Control of torque; Control of mechanical power characterised by the use of electric means

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Abstract

The invention discloses a method for presetting and controlling the coiling-assisting tension of a strip steel finishing machine set, which comprises the following steps: calculating the pre-set value T of the wrapper tension when coiling the 1 st turn1(ii) a Step two: calculating a pre-set value of the wrapper tension when the ith coil is coiled; step three: setting i to be 1; step four: comparing the torque feedback value T of the coiling machinefWith pre-set value T of wrapper tensioniIf T isf‑TiIf the time is more than delta T, the step IV is continued; if T isf‑Ti< - Δ T go to step five to continue execution; judging whether i is less than N, if so, making i equal to i +1, and going to the fourth step; otherwise, the wrapper coiling control is finished. The invention has the advantages of realizing the smooth rolling-up assisting of the strip steel and improving the product quality.

Description

Method for presetting and controlling coiling tension of strip steel finishing machine set
Technical Field
The invention belongs to the technical field of strip steel finishing treatment, and relates to a method for presetting and controlling the coiling tension of a strip steel finishing unit.
Background
The strip steel rolled by the cold rolling unit needs to be finished to obtain a high-quality qualified product. The finishing treatment is the last procedure of the finished product of the strip steel, so new defects cannot be generated, and the surface of the strip steel is not accurate to generate scratches and plastic deformation. The finishing unit mainly carries out the procedures of subdivision, straightening and withdrawal, rewinding, trimming, surface inspection, oiling and the like.
When the prior finishing unit is used for coil-aid coiling, the surface of strip steel is coated with oil, the friction coefficient between the strip steel and a coiling drum and between the strip steel and the coiled strip steel is very small, the strip steel is easy to slip, the inner ring of a coil of the coil after coil-aid is overflowed, and the qualified rate of the coil is greatly reduced. Therefore, in the wrapper stage, in order to avoid the slip between the strip steel and the winding drum, the wrapper tension cannot be too large. Meanwhile, in the coiling assisting stage, in order to realize normal coiling, the coiling assisting tension must ensure that the strip steel generates a certain curvature to be coated on the coiling drum, and then, each layer must ensure that the strip steel cannot be separated from the coiled strip steel. Therefore, in the coiling stage, in order to ensure the smooth coiling of the strip steel, the coiling tension cannot be too small.
Disclosure of Invention
The invention aims to provide a method for presetting and controlling the coiling-assisting tension of a strip steel finishing machine set, which solves the problem that the inner ring of a coiled steel coil overflows due to the slippage between strip steel and a winding drum and between the strip steel and coiled strip steel when the existing finishing machine set coils in a coiling-assisting manner, and greatly improves the product quality.
The technical scheme adopted by the invention is carried out according to the following steps:
the method comprises the following steps: calculating the pre-set value T of the wrapper tension when coiling the 1 st turn1；
Step two: calculating a pre-set value T of the assist-winding tension when winding the ith coil (i is 2-N)i(i＝2～N)；
Step three: setting i to be 1;
step four: comparing the torque feedback value T of the coiling machinefWith pre-set value T of wrapper tensioniIf T isf-TiIf > Delta T (Delta T is torque control precision), the real-time speed v of the coiling machinea＝vl-vm，vlAs unit speed, vmIn order to control the system speed excitation value, the step four is carried out continuously;
step five: comparing the torque feedback value T of the coiling machinefWith pre-set value T of wrapper tensioniIf T isf-Ti< Δ T (Δ T is torque control accuracy), the real-time speed v of the coilera＝vl+vm，vlIs made into a machineGroup velocity, vmTurning to the fifth step to continue execution for controlling the system speed excitation value;
step six: determine if i < N? If yes, making i equal to i +1, and going to step four; otherwise, go to step seven;
step seven: and finishing the wrapper coiling control.
Further, a pre-set value T of the wrapper tension at the 1 st winding is calculated1The process is as follows:
in order to determine the minimum tension required to bend the strip to the target curvature, the reel is considered integral with the strip that has already been coiled. A quarter unit is taken from the head of the strip steel in the reverse coiling direction for stress analysis, and according to elastic mechanics, the stress balance and moment balance in the horizontal and vertical directions can be listed as a balance equation:
Figure BDA0001555037640000021
in the formula: t is the strip steel tension, unit: n; f is the circumferential force, in units: n; p is the uniform distribution pressure stress that the outer ring belted steel received, unit: MPa; tau is the uniform distribution friction stress that the outer lane belted steel received, unit: MPa; mwInternal moment for section a, unit: nm; θ is the azimuth, in units: rad; r is the drum radius, unit: mm; b is the width of the strip steel, unit: mm.
Because the pressure stress on the outer ring strip steel is small, the outer ring strip steel can be considered to be in a critical slip state, and then:
τ＝μp (2)
in the formula: mu is the friction coefficient between the strip steel and the winding drum.
The combined type (1) and the formula (2) can obtain:
Figure BDA0001555037640000031
according to the bending elastic-plastic theory, the internal moment M can be knownwThe following were used:
Figure BDA0001555037640000032
in the formula: h is the thickness of the strip steel, unit: mm; sigmasThe yield strength of the strip steel is as follows: MPa; h istThe thickness of the strip steel in the elastic-plastic boundary area is as follows: the thickness of the film is mm,
Figure BDA0001555037640000033
e is the elastic modulus of the strip steel, unit: MPa.
The minimum value T of the wrapper tension can be obtained by combining the vertical type (3) and the formula (4)minIs composed of
Figure BDA0001555037640000041
In order to avoid the slipping phenomenon between the strip steel and the winding drum and between the strip steel and the coiled strip steel, the maximum value T of the auxiliary winding tension1maxThe calculation is as follows:
the force balance equation of the strip steel in the radial direction is as follows:
Figure BDA0001555037640000042
radial force balance equation for a belt:
Figure BDA0001555037640000043
according to the formulae (6) and (7), the compounds
Figure BDA0001555037640000044
In the formula: b isbIs the belt width, unit: mm; t isbIs belt tension, unit: n is added to the reaction solution to form a reaction solution,
Figure BDA0001555037640000045
in the formula, PhIs oil pressure, MPa; d0、d0The diameter of the cylinder and the rod of the hydraulic cylinder is mm; q isBelt wrap force, unit: MPa; qRIs the positive pressure between the strip steel and the winding drum, the unit is: MPa.
Neglecting infinite small amount of high order, have
Figure BDA0001555037640000046
Figure BDA0001555037640000047
When the distance d theta → 0 is large,
Figure BDA0001555037640000051
considering the friction between the strip and the reel, and neglecting the friction between the belt and the strip, the force balance equation in the circumferential direction is:
Figure BDA0001555037640000052
when d θ → 0, there is dT- μ QRBbRdθ
Substituting the formula (9) to obtain
Figure BDA0001555037640000053
When the head of the strip steel enters a point C with a wrap angle theta with a winding drum, the tension of a point B of the tangent point of the strip steel and the winding drum can be obtained according to the formula (11)
Figure BDA0001555037640000054
T can be obtained by integrationθ＝Tb(eμθ-1) (13)
When the head of the strip steel reaches the contact point D of the compression roller and the winding drum, the tension at the point B of the tangent point of the strip steel and the winding drum is the same under the action of the pressure P of the compression roller
Figure BDA0001555037640000055
In the formula
Figure BDA0001555037640000056
The belt is used for assisting in winding and wrapping the corners.
Thereby obtaining the maximum value T of the wrapper tension1max：
Figure BDA0001555037640000057
When the first circle is reeled, the pre-set value T of the reeling tension1Comprises the following steps:
T1＝a(Tmin+T0)+b(T1max+T0) (16)
in the formula: a. b is a weighting coefficient, and a is 0.5, and b is 0.5;
T0when the winding drum is wrapped by the wrapper belt, the rotation resistance of the winding drum is as follows, unit: and N is added.
Further, the pre-set value T of the assist winding tension at the time of winding the ith winding (i is 2 to N) is calculatedi(i-2. about. N) the procedure is as follows:
when the ith coil is wound (i is 2-N), the steel strip is coiled and is coated on the wound steel strip by the aid of the auxiliary winding tension, and the auxiliary winding tension is in accordance with the set value TiCan be set as follows:
Figure BDA0001555037640000061
in the formula: t ispThe unit is the set value of the coiling tension after the auxiliary coiling is finished: and N is added.
Furthermore, the pre-set value T of the wrapper tension of N turns before coilingiAnd (i is 1-N) is taken as a control target, and the coiling machine adopts a torque control mode to realize coiling tension presetting control and closed-loop control.
Drawings
FIG. 1 is a layout diagram of a wrapper coiling process of a strip finishing unit;
FIG. 2 is a quarter-circle arc strip chart;
FIG. 3 is an analysis diagram of belt assist wrap force;
FIG. 4 shows the belt wrapping when the strip is introduced into the drum;
FIG. 5 is a flow chart of the setup and control of the wrapper tension of the strip finishing unit.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The method for presetting and controlling the coiling tension of the strip steel finishing unit is completed by the equipment shown in figure 1, wherein the upper part of the equipment in figure 1 is upper coiling equipment, and the lower part of the equipment is lower coiling equipment. The equipment along the line sequentially comprises an outlet steering roller 1, strip steel 2, a winding drum 3 and a wrapper 4.
The upper coiling and wrapper assisting coiling process flow is as follows:
(1) the swing telescopic guide plate of the outlet steering roller 1 swings up and extends out to an upper coiling position;
(2) the wrapper 4 enters, the lower swing arm of the wrapper embraces the winding drum 3, and a wrapper belt of the wrapper 4 wraps the winding drum 3;
(3) the machine set is linked, the press roll of the exit turning roll 1 is pressed down, and the pinch strip steel 3 enters between the coiling-assistant belt of the coiling-assistant device 4 and the winding drum 3 through the swing telescopic guide plate of the exit turning roll 1;
(4) the machine set continues to be linked, and N turns (N is 5) are wound;
(5) the swing telescopic guide plate of the outlet turning roll 1 retracts and swings down to an initial position;
(6) the lower swing arm of the wrapper 4 is opened and retreats to the initial position;
(7) and (5) performing finishing production by linkage of the machine set.
The lower coiling auxiliary coiling process flow is as follows:
(1) the swing telescopic guide plate of the outlet steering roller 1 swings up and extends to a lower coiling position;
(2) the wrapper 4 enters, the swing arm on the wrapper holds the winding drum, and a wrapper belt of the wrapper 4 wraps the winding drum 3;
(3) the machine set is linked, the press roll of the exit turning roll 1 is pressed down, and the pinch strip steel 3 enters between the coiling-assistant belt of the coiling-assistant device 4 and the winding drum 3 through the swing telescopic guide plate of the exit turning roll 1;
(4) the machine set continues to be linked, and N turns (N is 5) are wound;
(5) the swing telescopic guide plate of the outlet turning roll 1 retracts and swings down to an initial position;
(6) the upper swing arm of the wrapper 4 is opened and returns to the initial position;
(7) and (5) performing finishing production by linkage of the machine set.
The invention mainly researches the presetting and control of the coiling tension in the coiling process of the strip steel finishing production to ensure that the strip steel is tightly attached to the coiling block and the strip steel does not slide between the strip steel and the coiling block and between the strip steel and the coiled strip steel, thereby solving the problem of overflow of the inner ring of the steel coil after the coiling.
The wrapper tension preset calculation is as follows:
in order to determine the minimum tension required to bend the strip to the target curvature, the reel is considered integral with the strip that has already been coiled, as shown in FIG. 2.
A quarter unit is taken from the head of the strip steel in the reverse coiling direction for stress analysis, and according to elastic mechanics, the stress balance and moment balance in the horizontal and vertical directions can be listed as a balance equation:
Figure BDA0001555037640000081
in the formula: t is the strip steel tension, unit: n; f is the circumferential force, in units: n; p is the uniform distribution pressure stress that the outer ring belted steel received, unit: MPa; tau is the uniform distribution friction stress that the outer lane belted steel received, unit: MPa; mwInternal moment for section a, unit: nm; θ is the azimuth, in units: rad; r is the drum radius, unit: mm; b is the width of the strip steel, unit: mm.
Because the pressure stress on the outer ring strip steel is small, the outer ring strip steel can be considered to be in a critical slip state, and then:
τ＝μp (2)
in the formula: mu is the friction coefficient between the strip steel and the winding drum.
The combined type (1) and the formula (2) can obtain:
Figure BDA0001555037640000091
according to the bending elastic-plastic theory, the internal moment M can be knownwThe following were used:
Figure BDA0001555037640000092
in the formula: h is the thickness of the strip steel, unit: mm; sigmasThe yield strength of the strip steel is as follows: MPa; h istThe thickness of the strip steel in the elastic-plastic boundary area is as follows: the thickness of the film is mm,
Figure BDA0001555037640000093
e is the elastic modulus of the strip steel, unit: MPa.
The minimum value T of the wrapper tension can be obtained by combining the vertical type (3) and the formula (4)minIs composed of
Figure BDA0001555037640000094
In order to avoid the slipping phenomenon between the strip steel and the winding drum and between the strip steel and the coiled strip steel, the maximum value T of the auxiliary winding tension1maxThe calculation is as follows:
fig. 3 shows the situation of the strip on the coiler drum and the stress situation of the belt and the strip under the belt coating.
The force balance equation of the strip steel in the radial direction is as follows:
Figure BDA0001555037640000095
radial force balance equation for a belt:
Figure BDA0001555037640000096
according to the formulae (6) and (7), the compounds
Figure BDA0001555037640000101
In the formula: b isbIs the belt width, unit: mm; t isbIs belt tension, unit: n is added to the reaction solution to form a reaction solution,
Figure BDA0001555037640000102
in the formula, PhIs oil pressure, MPa; d0、d0The diameter of the cylinder and the rod of the hydraulic cylinder is mm; q is belt wrap force, unit: MPa; qRIs the positive pressure between the strip steel and the winding drum, the unit is: MPa.
Neglecting infinite small amount of high order, have
Figure BDA0001555037640000103
Figure BDA0001555037640000104
When the distance d theta → 0 is large,
Figure BDA0001555037640000105
considering the friction between the strip and the reel, and neglecting the friction between the belt and the strip, the force balance equation in the circumferential direction is:
Figure BDA0001555037640000106
when d theta → 0, there is dT ═ mu QRBbRdθ
Substituting the formula (9) to obtain
Figure BDA0001555037640000107
According to FIG. 4, when the head of the strip steel enters into the point C with the wrap angle theta to the reel, the tension at the point B of the tangent point of the strip steel and the reel can be obtained according to the formula (11)
Figure BDA0001555037640000111
T can be obtained by integrationθ＝Tb(eμθ-1) (13)
When the head of the strip steel reaches the contact point D of the compression roller and the winding drum, the tension at the point B of the tangent point of the strip steel and the winding drum is the same under the action of the pressure P of the compression roller
Figure BDA0001555037640000112
In the formula
Figure BDA0001555037640000113
The belt is used for assisting in winding and wrapping the corners.
Thereby obtaining the maximum value T of the wrapper tension1max：
Figure BDA0001555037640000114
When the first circle is reeled, the pre-set value T of the reeling tension1Comprises the following steps:
T1＝a(Tmin+T0)+b(T1max+T0) (16)
in the formula: a. b is a weighting coefficient, and a is 0.5, and b is 0.5;
T0when the winding drum is wrapped by the wrapper belt, the rotation resistance of the winding drum is as follows, unit: and N is added.
When the ith coil is wound (i is 2-N), the steel strip is coiled and is coated on the wound steel strip by the aid of the auxiliary winding tension, and the auxiliary winding tension is in accordance with the set value TiCan be set as follows:
Figure BDA0001555037640000115
in the formula: t ispThe unit is the set value of the coiling tension after the auxiliary coiling is finished: and N is added.
Finishing machine for strip steelThe group assist-roll tension control method uses the pre-set value T of the assist-roll tension of N turns before rollingi(i is 1 to N) as a control target, the coiler adopts torque mode control to realize wrapper tension presetting control and closed-loop control, as shown in fig. 5, the method comprises the following steps:
the method comprises the following steps: calculating the pre-set value T of the wrapper tension when coiling the 1 st turn1；
Step two: calculating a pre-set value T of the assist-winding tension when winding the ith coil (i is 2-N)i(i＝2～N)；
Step three: setting i to be 1;
step four: comparing the torque feedback value T of the coiling machinefWith pre-set value T of wrapper tensioniIf T isf-TiIf > Delta T (Delta T is torque control precision), the real-time speed v of the coiling machinea＝vl-vm，vlAs unit speed, vmIn order to control the system speed excitation value, the step four is carried out continuously;
step five: comparing the torque feedback value T of the coiling machinefWith pre-set value T of wrapper tensioniIf T isf-Ti< Δ T (Δ T is torque control accuracy), the real-time speed v of the coilera＝vl+vm，vlAs unit speed, vmTurning to the fifth step to continue execution for controlling the system speed excitation value;
step six: determine if i < N? If yes, making i equal to i +1, and going to step four; otherwise, go to step seven;
step seven: and finishing the wrapper coiling control.
The method for presetting and controlling the wrapper tension of the strip steel finishing unit provided by the invention is successfully applied to a certain automobile plate finishing unit. The width B of the strip is 1500mm, the thickness h is 1.5mm, and the yield strength sigma iss430MPa, the radius R of the reel is 305mm, and the resistance T generated when the wrapper belt wraps the reel03000N, set value of winding tension Tp35000N. Through calculation, in the wrapper-assisting process, the set values of the wrapper-assisting tension of the first five turns are as follows: 35000N. Through engineering practice, the coiling assisting effect is good, and the quality of the inner ring of the produced steel coil is goodAnd (4) the product is completely qualified.
The invention comprehensively considers the slipping phenomenon between the strip steel and the winding drum and between the strip steel and the coiled strip steel during the coil aid, ensures that the strip steel is tightly attached to the winding drum or the coiled strip steel, and develops the coil aid tension presetting and controlling method of the strip steel finishing unit on the basis of the principle that the strip steel is tightly attached and does not slip at the same time, thereby solving the problem of overflow of the inner ring of the coil after coil aid and obviously improving the qualified rate of the coil. The smooth rolling-assistant of the strip steel is realized, the problem of overflow of the inner ring of the steel coil after the rolling-assistant is solved, and the product quality is greatly improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.

Claims (1)

1. A coil aid tension presetting and controlling method for a strip steel finishing machine set is characterized by comprising the following steps:
the method comprises the following steps: calculating the pre-set value T of the wrapper tension when coiling the 1 st turn1；
Step two: calculating the pre-set value T of the auxiliary winding tension when winding the ith coili，i＝2～N；
Step three: setting i to be 1;
step four: comparing the torque feedback value T of the coiling machinefWith pre-set value T of wrapper tensioniIf T isf-TiWhen the torque is more than delta T, the delta T is the torque control precision, the real-time speed v of the coiling machinea＝vl-vm，vlAs unit speed, vmIn order to control the system speed excitation value, the step four is carried out continuously;
step five: comparing the torque feedback value T of the coiling machinefWith pre-set value T of wrapper tensioniIf T isf-TiIf less than-Delta T, the real-time speed v of the coilera＝vl+vm，vlAs unit speed, vmFor controlling the system speed excitation value, turnContinuing to execute the step five;
step six: determine if i < N? If yes, making i equal to i +1, and going to step four; otherwise, go to step seven;
step seven: finishing the wrapper coiling control;
step 1, calculating the pre-set value T of the wrapper tension when coiling the 1 st turn1The process is as follows:
in order to determine the minimum tension required by bending the strip steel to the target curvature, a winding drum and the strip steel which is already coiled are considered as a whole, a quarter unit is taken from the head of the strip steel in the opposite coiling direction for stress analysis, and according to the elastic mechanics, the stress balance and the moment balance in the horizontal direction and the vertical direction list balance equations:
Figure FDA0002692584650000011
in the formula: t is the strip steel tension, unit: n; f is the circumferential force, in units: n; p is the uniform distribution pressure stress that the outer ring belted steel received, unit: MPa; tau is the uniform distribution friction stress that the outer lane belted steel received, unit: MPa; mwInternal moment for section a, unit: nm; θ is the azimuth, in units: rad; r is the drum radius, unit: mm; b is the width of the strip steel, unit: mm;
because the pressure stress on the outer ring strip steel is small, the outer ring strip steel is considered to be in a critical slip state, and then:
τ＝μp (2)
in the formula: mu is the friction coefficient between the strip steel and the winding drum;
the combined type (1) and the formula (2) can obtain:
Figure FDA0002692584650000021
according to the bending elastic-plastic theory, the internal moment M can be knownwThe following were used:
Figure FDA0002692584650000022
in the formula: h is the thickness of the strip steel, unit: mm; sigmasThe yield strength of the strip steel is as follows: MPa; h istThe thickness of the strip steel in the elastic-plastic boundary area is as follows: the thickness of the film is mm,
Figure FDA0002692584650000023
e is the elastic modulus of the strip steel, unit: MPa;
the minimum value T of the wrapper tension can be obtained by combining the vertical type (3) and the formula (4)minIs composed of
Figure FDA0002692584650000031
In order to avoid the slipping phenomenon between the strip steel and the winding drum and between the strip steel and the coiled strip steel, the maximum value T of the auxiliary winding tension1maxThe calculation is as follows:
the force balance equation of the strip steel in the radial direction is as follows:
Figure FDA0002692584650000032
radial force balance equation for a belt:
Figure FDA0002692584650000033
obtained according to formulae (6) and (7)
Figure FDA0002692584650000034
In the formula: b isbIs the belt width, unit: mm; t isbIs belt tension, unit: n is added to the reaction solution to form a reaction solution,
Figure FDA0002692584650000035
in the formula, PhIs oil pressure，MPa；D0、d0The diameter of the cylinder and the rod of the hydraulic cylinder is mm; q is belt wrap force, unit: MPa; qRIs the positive pressure between the strip steel and the winding drum, the unit is: MPa;
neglecting infinite small amount of high order, have
Figure FDA0002692584650000036
Figure FDA0002692584650000037
When the distance d theta → 0 is large,
Figure FDA0002692584650000041
considering the friction between the strip and the reel, and neglecting the friction between the belt and the strip, the force balance equation in the circumferential direction is:
Figure FDA0002692584650000042
when d theta → 0, there is dT ═ mu QRBbRdθ
Substituting the formula (9) to obtain
Figure FDA0002692584650000043
When the head of the strip steel enters a point C with a wrap angle theta with a winding drum, the tension of a point B of the tangent point of the strip steel and the winding drum can be obtained according to the formula (11)
Figure FDA0002692584650000044
T can be obtained by integrationθ＝Tb(eμθ-1) (13)
When the head of the strip steel reaches the contact point D of the compression roller and the winding drum, under the action of the compression roller force P,
the tension at the point B of the tangent point of the strip steel and the winding drum is
Figure FDA0002692584650000045
In the formula
Figure FDA0002692584650000046
The belt is used for assisting in rolling and wrapping corners;
thereby obtaining the maximum value T of the wrapper tension1max：
Figure FDA0002692584650000047
When the first circle is reeled, the pre-set value T of the reeling tension1Comprises the following steps:
T1＝a(Tmin+T0)+b(T1max+T0) (16)
in the formula: a. b is a weighting coefficient, and a is 0.5, and b is 0.5;
T0when the winding drum is wrapped by the wrapper belt, the rotation resistance of the winding drum is as follows, unit: n;
the process of calculating the preset value of the wrapper tension when the ith coil is coiled in the step 2 is as follows:
when the ith coil is wound, i is 2-N, the band steel is coiled and is coated on the wound band steel by the aid of the aid-winding tension, and the aid-winding tension is in accordance with the set value TiSetting as follows:
Figure FDA0002692584650000051
in the formula: t ispThe unit is the set value of the coiling tension after the auxiliary coiling is finished: n;
the pre-set value T of the wrapper tension of N turns before coilingiFor the control target, the coiling machine adopts a torque control mode to realize the pre-setting control and the closed-loop control of the coiling tension。
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