CN115971250A - Reversible precision copper foil rolling production line, production process and tension control method - Google Patents
Reversible precision copper foil rolling production line, production process and tension control method Download PDFInfo
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Abstract
A reversible precision copper foil rolling production line, a production process and a tension control method are disclosed, the reversible precision copper foil rolling production line comprises a 20-roller reversible rolling mill, an oil mist cooling device, an X-ray thickness gauge, a laser velocimeter, a plate roller and a coiler, wherein the oil mist cooling device, the X-ray thickness gauge, the laser velocimeter, the plate roller and the coiler are sequentially and symmetrically arranged on two sides of the reversible rolling mill, a magnetorheological fluid clutch is arranged in a drive transmission chain of the coiler, and the rolling tension output by a scroll is controlled by controlling the working torque of the magnetorheological fluid clutch; the plate type roller collects signals and feeds back the signals to the reversible rolling mill for plate type control, and the collected signals are also fed back to the coiling machine to accurately control the working torque of a magnetorheological fluid clutch in a driving chain of the coiling machine so as to realize accurate control of rolling tension; the reversible precision copper foil rolling production line adopts a production process of low negative roll gap rolling force and high-speed rolling, and fully ensures the dimensional precision and the residual stress of the rolled foil by accurately controlling the inlet tension, the outlet tension and the rolling speed of a rolling mill.
Description
Technical Field
The invention relates to the technical field of non-ferrous metal precision belt foil production, in particular to a reversible precision copper foil rolling production line, a production process and a tension control method.
Background
The copper strip foil is a main product type for processing and applying copper and copper alloy, accounts for more than 20% of the yield of deformed copper, and is widely applied to the fields of aerospace, national defense and military industry, military equipment, modern communication, electronic information, lithium batteries and the like; with the continuous development of the technology, the quality requirements of the fields of aerospace, national defense and military industry, military equipment, modern communication, electronic information and the like on copper foil are higher and higher, wherein the quality requirements on the copper foil include that the size precision, residual stress, surface finish, anisotropy, elongation, strength, dielectric constant, corrosion resistance, high temperature resistance and creep resistance of the copper strip foil are stricter and stricter, and the high-grade copper strip foil is also called as a 'precision strip foil' in the international and domestic industries.
Although the quality of the 'precision band foil' is ensured by the whole process of the copper blank hot rolling, the copper strip rough rolling, the intermediate rolling, the copper foil finish rolling, the surface treatment and the heat treatment production which run through the 'precision band foil' production, the final rolling production equipment and the production process of the 'precision band foil' play a decisive role in the final quality of the 'precision band foil', in particular to the double-zero copper foil in the 'precision band foil' which is used as a high-end product in the 'precision band foil', and the requirement on the control precision of parameters in the final rolling production equipment and the production process is higher.
The existing double-zero rolling copper foil mostly adopts a six-roller rolling mill to roll C1700 series pure copper, and because the diameter of a working roller of the six-roller rolling mill is larger, the effect is not ideal when double-zero foil rolling is carried out on copper alloy with higher deformation resistance in the rolling process; in addition, since the six-roller rolling mill is monopolized by foreign manufacturers to a higher degree, the purchase cost of the six-roller rolling mill is higher, and therefore, the six-roller rolling mill is replaced by a twenty-roller rolling mill (the diameter of a working roller of the twenty-roller rolling mill is smaller than that of the six-roller rolling mill) with higher maturity and relatively lower purchase cost, and double zero foil rolling is performed on the copper alloy, which is a better choice theoretically.
Before, copper foil manufacturers try to adopt a twenty-roller rolling mill to carry out double-zero foil rolling on copper alloy, but the control effect of the dimensional precision and the residual stress of the copper alloy foil after rolling is not ideal, and the reason is that: the foil rolling process of the double-zero copper foil adopts negative roll gap rolling, and the rolling process parameters comprise two control methods: 1. the rolling force of the large negative roll gap is adopted, the rolling is carried out at a low speed, the size precision and the residual stress of the rolled foil are ensured through the rolling force of the negative roll gap, the process parameters are relatively simple to control and more are adopted, but the process also has the problems of low production efficiency, large bearing pressure of a rolling mill bearing and unstable size precision and residual stress of the produced copper foil; 2. the process has the advantages that the process is high in production efficiency and small in bearing pressure of a rolling mill bearing, but the requirements on process parameters, particularly the control precision of the inlet tension, the outlet tension and the rolling speed of the rolling mill are extremely high, once tension control is poor in the production process, the problem that the dimensional precision and the residual stress of the produced copper foil are unstable is easily caused, strip breakage can be caused in serious cases, production is forced to be interrupted, and normal production of enterprises is seriously influenced.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention discloses a reversible precision copper foil rolling production line, a production process and a tension control method; the reversible precision copper foil rolling production line comprises a 20-roller reversible rolling mill, and an oil mist cooling device, an X-ray thickness gauge, a laser velocimeter, a plate roller and a coiler which are sequentially and symmetrically arranged on two sides of the reversible rolling mill, wherein a magnetorheological fluid clutch is arranged in a drive transmission chain of the coiler, and the rolling tension output by a scroll is controlled by controlling the working torque of the magnetorheological fluid clutch; the collected signals of the plate-type roller are fed back to the reversible rolling mill for plate shape control, and the collected signals are also fed back to the coiling machine, so that the working torque of the magnetorheological fluid clutch in the driving transmission chain of the coiling machine is accurately controlled, and the accurate control of the rolling tension is realized.
In order to realize the purpose, the invention adopts the following technical scheme: a reversible precision copper foil rolling production line comprises a reversible rolling mill, a coiler, a plate roller, a laser velocimeter, an X-ray thickness gauge and an oil mist cooling device; the rolling mill is a 20-roller reversible rolling mill; the oil mist cooling device, the X-ray thickness gauge, the laser velocimeter and the plate-type roller are sequentially and symmetrically arranged at two sides of the reversible rolling mill; the collected signals of the plate-type roller are fed back to the reversible rolling mill for plate shape control, and the collected signals are also fed back to the coiling machine for rolling tension control in the rolling process.
Further, the coiling machine comprises a frame, a scroll, a torque synthesis speed reducer, a magnetorheological fluid clutch, a gearbox and a motor; the reel is rotationally arranged on the rack, and the reel and the motor are in transmission connection through a torque synthesis speed reducer, a magnetorheological fluid clutch and a gearbox in sequence; in the technical scheme of the reverse precision copper foil rolling production line, the traditional control structure for controlling the rolling tension by controlling the rotation speed difference between the reel and the working roller or the driving torque of the reel driving motor is changed, and the torque of the reel is directly controlled by the working torque of the magnetorheological fluid clutch, so that the rolling tension is finally controlled, and the problems of long transmission chain, large rotational inertia, low response speed and low precision of a driving system of the traditional tension control structure are solved.
Further, the torque synthesis speed reducer comprises a torque output shaft and a plurality of torque input shafts, the torque output shaft is meshed with the plurality of torque input shafts through gears, and a fixed reduction ratio is arranged between the torque output shaft and the torque input shafts; the gearbox is provided with output shafts with the same number as the torque input shafts of the torque synthesis speed reducer; one end part of the scroll is fixedly connected with a torque output shaft of the torque synthesis speed reducer through a coupler; the torque input shafts of the torque synthesis speed reducer are in transmission connection with the output shafts of the gearbox through the magnetorheological fluid clutches respectively, and the input shaft of the gearbox is in transmission connection with the output shaft of the motor; working torques of the magnetorheological fluid clutches are combined into a larger driving torque through a torque combining speed reducer to drive the reel to rotate, and the rolling tension output by the reel is finally controlled by controlling the combined driving torque; the reason for providing multiple magnetorheological fluid clutches in the drive train of the coiler is that: the maximum torque provided by the existing magnetorheological fluid clutch is small, the rolling tension required by rolling the copper alloy foil is large, and the fact that one magnetorheological fluid clutch can provide enough working torque for a reel cannot be realized at present.
A precision copper foil rolling production process of a reversible precision copper foil rolling production line is characterized in that the starting rolling thickness is 0.05mm, the final rolling thickness is 0.006mm, the rolling process is divided into 3 rolling passes, and the processing rate of each rolling pass is not more than 50%; wherein the first rolling pass is rolled to 0.025mm, and the second rolling pass is rolled; wherein the second rolling pass is rolled to 0.09mm, and the third rolling pass is carried out; rolling to 0.006mm in the third rolling pass, and performing three rolling passes; low-temperature annealing treatment is required between each rolling process; carrying out reciprocating rolling by adopting a negative roller gap, constant tension and constant rolling speed; wherein the control precision of the inlet tension and the outlet tension of the reversible mill is less than or equal to +/-0.1 percent, and T is a tension value.
A rolling tension control method for a reversible precision copper foil rolling production line is characterized in that the working torque of a single one of a plurality of magnetorheological fluid clutches is fed back and controlled through a tension signal acquired by a plate roller, so that the precise control of the synthetic torque is realized; the rolling tension provided by the reel is accurately controlled by accurately controlling the synthetic torque; in the invention, a plurality of magnetorheological fluid clutches are finally synthesized into torque required by the operation of a reel through a torque synthesis speed reducer, and the reduction ratio between a torque input shaft and a torque output shaft (reel) of the torque synthesis speed reducer is 1:1; when the output torque of the torque synthesis speed reducer is controlled, if a plurality of magnetorheological fluid clutches are simultaneously adjusted and controlled, although the adjustment and control method is simpler, the control precision is reduced; by adjusting and controlling the working torque of one of the magnetorheological fluid clutches, the control precision of the final output rolling tension of the reel can be obviously improved although the adjusting and controlling method is complex.
Furthermore, the working torque actually provided by a plurality of magnetorheological fluid clutches is controlled to control the synthesized driving torque; controlling the rolling tension output by the reel by the resultant driving torque; the control process comprises the following steps:
s1, setting the working speed of the magnetorheological fluid clutch: the working speed of the magnetorheological fluid clutch is the difference of the rotating speed of the torque input shaft and the torque output shaft; for the coiling machine at the outlet end of the reversible rolling mill, the rotating speed difference between the torque input shaft and the torque output shaft is set and maintained between positive 20 rpm and positive 80rpm, namely the rotating speed of the torque input shaft is higher than that of the torque output shaft; for the coiling machine at the inlet end of the reversible mill, the rotating speed difference between the torque input shaft and the torque output shaft is set and maintained between negative 20 rpm and negative 80rpm, namely the rotating speed of the torque input shaft is lower than that of the torque output shaft;
s2, distributing the working torque of the magnetorheological fluid clutch: the initial working torque is averagely distributed to a plurality of magnetorheological fluid clutches according to the torque required by the actual working of the reel, and the calculation formula is as follows:
Mci=Mj/I*n ......(1)
Mj=T*Rj ......(2)
wherein: mci is the torque distributed by a single magnetorheological fluid clutch; mj is the torque required by the actual operation of the reel; i is the transmission ratio between the output shaft of the magnetorheological fluid clutch and the reel; n is the number of the magnetorheological fluid clutches; t is rolling tension; rj is the outer diameter of the copper strip coil on the reel;
s3, controlling the working torque of the magnetorheological fluid clutch: the working torques of the magnetorheological fluid clutches are fed back by tension signals collected by the plate type roller to form PID control; in the feedback control process, only one of the magnetorheological fluid clutches is subjected to working torque adjustment control; a threshold value is set for the torque accumulation adjustment value of one magnetorheological fluid clutch; when the torque accumulated adjustment value of the feedback-controlled magnetorheological fluid clutch reaches or exceeds a set threshold value, the feedback control process starts to perform feedback control on the other magnetorheological fluid clutch according to a set sequence; and analogizing in turn, and realizing the feedback control of each magnetorheological fluid clutch in the whole feedback control process.
Preferably, the initial working torque distribution of the magnetorheological fluid clutches takes the torque value averagely distributed to the plurality of the magnetorheological fluid clutches by the torque required by the actual working of the reel as a middle value, and randomly distributes the torque value to the plurality of the magnetorheological fluid clutches in the form of an arithmetic progression; the difference value of the equal difference sequence is the torque accumulated value which is allowed to be adjusted by the magnetorheological fluid clutch.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the invention discloses a reversible precision copper foil rolling production line, a production process and a tension control method, wherein the reversible precision copper foil rolling production line comprises a 20-roller reversible rolling mill, and an oil mist cooling device, an X-ray thickness gauge, a laser velocimeter, a plate roller and a coiler which are sequentially and symmetrically arranged at two sides of the reversible rolling mill, wherein a magnetorheological fluid clutch is arranged in a drive transmission chain of the coiler, and the rolling tension output by a scroll is controlled by controlling the working torque of the magnetorheological fluid clutch; the plate-type roller collects signals and feeds back the signals to the reversible rolling mill for plate-type control, and the collected signals are also fed back to the coiling machine to accurately control the working torque of a magnetorheological fluid clutch in a driving chain driven by the coiling machine, so that the rolling tension is accurately controlled; the reversible precision copper foil rolling production line adopts a small negative roll gap rolling force and a high-speed rolling production process, and fully ensures the dimensional precision and the residual stress of the copper alloy double-zero foil by accurately controlling the inlet tension, the outlet tension and the rolling speed of a rolling mill, thereby realizing the substitution of foreign copper alloy double-zero foils and solving the problem of neck clamping in the production of domestic high-end copper foils.
Drawings
FIG. 1 is a schematic view showing the structure of a reversible precision copper foil rolling line;
FIG. 2 is a schematic view of the transmission structure of the coiler;
FIG. 3 is a schematic diagram of a torque combining reducer;
FIG. 4 is a schematic view of a reel tension control process.
In the figure: 1. a reversible mill; 2. a coiler; 2.1, a frame; 2.2, intermediate product coiler reel; 2.3, a torque synthesis speed reducer; 2.3.1, a torque output shaft; 2.3.1.1, an output shaft gear; 2.3.1.2, an output shaft coupling; 2.3.2, torque input shaft; 2.3.2.1, input shaft gear; 2.3.2.2, input shaft coupling; 2.4, a magnetorheological fluid clutch; 2.5, a gearbox; 2.6, a motor; 3. a plate-shaped roller; 4. a laser velocimeter; 5. an X-ray thickness gauge; 6. an oil mist cooling device; 7. an initial torque distribution process; 8. working torque sequencing process of the magnetorheological fluid clutch; 9. and (5) feedback control circulation flow.
Detailed Description
The present invention will be explained in detail by the following examples, which are disclosed for the purpose of protecting all technical improvements within the scope of the present invention.
A reversible precision copper foil rolling production line comprises a reversible rolling mill 1, a coiling machine 2, a plate type roller 3, a laser velocimeter 4, an X-ray thickness gauge 5 and an oil mist cooling device 6; the rolling mill 1 is a 20-roller reversible rolling mill; the oil mist cooling device 6, the X-ray thickness gauge 5, the laser velocimeter 4 and the plate type roll 3 are sequentially and symmetrically arranged at two sides of the reversible rolling mill 1; the plate type roller 3 collects signals and feeds back the signals to the reversible rolling mill 1 for plate type control, and meanwhile, the collected signals are also fed back to the coiler 2 for rolling tension control in the rolling process;
the recoiling machine 2 comprises a frame 2.1, a scroll 2.2, a torque synthesis speed reducer 2.3, a magnetorheological fluid clutch 2.4, a gearbox 2.5 and a motor 2.6; the scroll 2.2 is rotationally arranged on the frame 2.1, and the end part of the right side of the scroll is fixedly connected with a torque output shaft 2.3.1 of a torque synthesis speed reducer 2.3 through a coupler; the torque synthesis speed reducer 2.3 is provided with three torque input shafts 2.3.2, the gearbox 2.5 is provided with three output shafts, the three torque input shafts 2.3.2 of the torque synthesis speed reducer 2.3 are respectively in transmission connection with the three output shafts of the gearbox 2.5 through three magnetorheological fluid clutches 2.4, wherein the torque input shaft 2.3.2 of the torque synthesis speed reducer 2.3 is in meshing connection with the torque output shaft 2.3.1 through a gear, the torque synthesis speed reducer is provided with a reduction ratio of 1:1, and the maximum working torque of the magnetorheological fluid clutch 2.4 is 2.0KN m; the input shaft of the gearbox 2.5 is in transmission connection with the motor 2.7; the reversible precision copper foil rolling production line of the invention adopts a magnetorheological fluid clutch 2.4 to directly control the torque of a scroll 2.2 to control the rolling tension, and the working principle is as follows: the working torque provided by the three magnetorheological fluid clutches 2.4 arranged in the driving transmission chain of the scroll 2.2 is synthesized and amplified by the torque synthesis speed reducer 2.3 to provide driving torque for the scroll 2.2; the working torque of one magnetorheological fluid clutch 2.4 of the three magnetorheological fluid clutches 2.4 is controlled in turn by the feedback signal of the plate-shaped roller 3, so that the driving torque of the driving reel 2.2 is accurately controlled, and the rolling tension provided by the reel 2.2 is kept constant in the rolling production process of the precision copper foil; the working principle of the rolling tension control system solves the problems of large moment of inertia, low response speed and low control precision of the traditional rolling tension system, so that the control precision of the rolling tension in the hot rolling process of the precision copper foil can be greatly improved, and the stability of the dimensional precision of the precision copper foil is ensured; specifically, the following are mentioned: for the recoiling machine 2 at the outlet end of the reversible rolling mill, the rotating speed of a torque input shaft is higher than that of a torque output shaft; for the coiler 2 at the entry end of the reversible mill, the torque input shaft speed is lower than the torque output shaft speed; the rotational speed difference between the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4 is set and maintained between minus 20 rpm and minus 80 rpm.
A precision copper foil rolling production process of a reversible precision copper foil rolling production line has the starting rolling thickness of 0.05mm, the final rolling thickness of 0.006mm and 3 rolling passes, and the total processing rate of each rolling pass is not more than 50%; wherein the first rolling pass is rolled to 0.025mm, and the second rolling pass is rolled; wherein the second rolling pass is rolled to 0.012mm, and the third rolling pass is carried out; rolling to 0.006mm in the third rolling pass, and performing three rolling passes; low-temperature annealing treatment is required between each rolling process; carrying out reciprocating rolling by adopting a negative roller gap, constant tension and constant rolling speed; wherein the reversible mill inlet tension, outlet tension control accuracy is ≦ 0.1%;
taking high copper alloy C19040 foil rolling as an example: the starting rolling thickness is 0.05mm, the finishing rolling thickness is 0.006mm, and the rolling process is divided into 3 rolling processes;
the first rolling process is to roll to 0.025mm, and two rolling passes are carried out:
the first pass machining rate is 30.0 percent, the inlet tension is 1.0KN, the outlet tension is 1.88KN, the rolling force is 45t, and the rolling speed is 300m/min;
the second pass machining rate is 28.6 percent, the inlet tension is 1.8KN, the outlet tension is 2.44KN, the rolling force is 45t, and the rolling speed is 350m/min;
and (3) rolling to 0.09mm in the second rolling pass, wherein the rolling passes are divided into three rolling passes:
the first pass machining rate is 25 percent, the inlet tension is 0.8KN, the outlet tension is 1.5KN, the rolling force is 40t, and the rolling speed is 400m/min;
the second pass machining rate is 20%, the inlet tension is 1.5KN, the outlet tension is 2.0KN, the rolling force is 40t, and the rolling speed is 450m/min;
the third pass machining rate is 20%, the inlet tension is 2.0KN, the outlet tension is 2.4KN, the rolling force is 40t, and the rolling speed is 500m/min;
and (3) rolling to 0.006mm in a third rolling pass, wherein the third rolling pass comprises three rolling passes:
the first pass machining rate is 25 percent, the inlet tension is 0.6KN, the outlet tension is 1.0KN, the rolling force is 35t, and the rolling speed is 500m/min;
the second pass machining rate is 20%, the inlet tension is 1.2KN, the outlet tension is 1.6KN, the rolling force is 35t, and the rolling speed is 550m/min;
the third pass machining rate is 16.7 percent, the inlet tension is 1.5KN, the outlet tension is 1.9KN, the rolling force is 35t, and the rolling speed is 600m/min.
A rolling tension control method of a reversible precision copper foil rolling production line synthesizes driving torque through actual working torque of a plurality of magnetorheological fluid clutches 2.4; the working torque of a single magnetorheological fluid clutch 2.4 is controlled through the tension signal feedback collected by the plate type roller 3, the control adjustment of the synthesized driving torque is realized, and the rolling tension output by the reel 2.2 is finally controlled by the synthesized torque which is controlled and adjusted, wherein the control process comprises the following steps:
s1, setting the working speed of a magnetorheological fluid clutch 2.4: the working speed of the magnetorheological fluid clutch 2.4 is the difference of the rotating speed of the torque input shaft and the torque output shaft; for the coiling machine 2 at the outlet end of the reversible rolling mill 1, the rotating speed of a torque input shaft is higher than that of a torque output shaft, the rotating speed difference between the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4 is set to be maintained at positive 30rpm, at the moment, a reel 2.2 in the coiling machine 2 is driven by a motor 2.6 to rotate, and the driving torque of the reel 2.2 is controlled by the magnetorheological fluid clutch 2.4; for the coiling machine 2 at the inlet end of the reversible rolling mill 1, the rotating speed of a torque input shaft is lower than that of a torque output shaft, the rotating speed difference between the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4 is maintained at minus 30rpm, a reel 2.2 in the coiling machine 2 is driven by rolled copper foil to rotate at the moment, the reel 2.2 provides resistance torque, the magnitude of the resistance torque is controlled by the magnitude of the actual working torque of the magnetorheological fluid clutch 2.4, and the motor 2.6 actually works in a braking mode at the moment;
s2, distributing the working torque of the magnetorheological fluid clutch 2.4: the initial working torque is averagely distributed to a plurality of magnetorheological fluid clutches 2.4 by the torque required by the actual work of the reel 2.2, and the calculation formula is as follows:
Mci=Mj/I*n ......(1)
Mj=T*Rj ......(2)
wherein: mci is the torque distributed by the single magnetorheological fluid clutch 2.4; mj is the torque required by the actual operation of the reel 2.2; i is the transmission ratio between the output shaft of the magnetorheological fluid clutch 2.4 and the reel 2.2; n is the number of the magnetorheological fluid clutches 2.4; t is rolling tension; rj is the outer diameter of the copper strip coil on the reel 2.2;
s3, controlling the working torque of the magnetorheological fluid clutch 2.4: the working torques of the magnetorheological fluid clutches 2.4 are fed back by tension signals collected by the plate type roller 3 to form PID control; in the feedback control process, only one of the magnetorheological fluid clutches 2.4 is subjected to working torque adjustment control; a threshold value is set for the torque accumulation adjustment value of one magnetorheological fluid clutch 2.4; when the torque accumulated adjustment value of the feedback-controlled magnetorheological fluid clutch 2.4 reaches or exceeds a set threshold value, the feedback control process starts to perform feedback control on the other magnetorheological fluid clutch 2.4 according to a set sequence; by analogy, in the whole feedback control process, the feedback control of each magnetorheological fluid clutch 2.4 is realized;
supplementary notes are that: in the rolling tension control process of the reversible precision copper foil rolling production line, the control of the 2.2 rotating speed of the reel is actually included, the control structure and the control method are basically the same as those of the prior art, and detailed description is omitted; the difference lies in that: the control of the rotating speed of a reel 2.2 of a coiling machine 2 at the outlet end of a reversible rolling mill 1 needs to be properly improved on the basis of the calculated rotating speed of a motor; the control of the speed of the reel 2.2 of the coiler 2 at the inlet end of the reversible rolling mill 1 is to be properly reduced on the basis of the calculated speed of the motor; ensuring that the difference between the rotational speeds of the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4 is maintained between 20 and 80rpm, normally reducing the heat generation of the magnetorheological fluid clutch 2.4 during operation, the difference between the rotational speeds of the torque input shaft and the torque output shaft is set near a lower limit, normally set at 30rpm;
for example, when precision copper foil is rolled in the first pass of the first rolling process, the speed is 300m/min, and assuming that the coil diameter of the inlet section reel 2.2 of the reversible rolling mill 1 is 2m and the coil diameter of the outlet section reel 2.2 of the reversible rolling mill 1 is 1.5m at a certain stage of the rolling process, the rotating speed of the inlet section reel 2.2 of the reversible rolling mill 1 is calculated to be 30.39rpm, and the rotating speed of the outlet section reel 2.2 of the reversible rolling mill 1 is 43.428rpm;
according to the reduction ratio of 1:1 between the torque input shaft 2.3.2 and the torque output shaft 2.3.1 of the torque synthesis speed reducer 2.3, the rotating speed of the torque input shaft 2.3.2 of the torque synthesis speed reducer 2.3 of the inlet coiler 2 of the reversible rolling mill 1 is 30.39rpm, and according to the rotating speed difference of the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4, the rotating speed of the torque input shaft of the magnetorheological fluid clutch 2.4 is 0.39rpm; assuming that the reduction ratio of the gearbox 2.5 is 10, finally calculating to obtain that the rotating speed of a motor 2.6 of the inlet coiler 2 of the reversible rolling mill 1 is 39rpm;
similarly, according to the reduction ratio of 1:1 between the torque input shaft 2.3.2 and the torque output shaft 2.3.1 of the torque synthesis speed reducer 2.3, the rotation speed of the torque input shaft 2.3.2 of the torque synthesis speed reducer 2.3 of the recoiler 2 at the outlet section of the reversible rolling mill 1 is 43.428rpm, and according to the rotation speed difference of 30rpm between the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4, the rotation speed of the torque input shaft of the magnetorheological fluid clutch 2.4 is 73.428rpm; assuming that the reduction ratio of the gearbox 2.5 is 10, finally calculating to obtain that the rotating speed of a motor 2.6 of the recoiler 2 at the outlet section of the reversible rolling mill 1 is 734.28rpm;
the rolling tension control process of the reversible precision copper foil rolling production line is specifically shown in the attached figure 4 of the specification, and the rolling tension control process actually comprises an initial torque distribution process 7, a magnetorheological fluid clutch 2.4 working torque sequencing process 8 and a feedback control circulation process 9; the following description will be given by taking the first pass rolling of the precision copper foil in the first rolling process as an example, and the rolling tension control process of the precision copper foil in the foil rolling process is as follows:
the thickness before rolling is 0.05mm, the first pass machining rate is 30.0 percent, the inlet tension is 1.0KN, the outlet tension is 1.88KN, the rolling force is 45t, and the rolling speed is 300m/min; the control precision range of the inlet tension and the outlet tension is +/-0.1 percent; the diameter of the coil at the inlet section of the reversible rolling mill 1 is 2.0m, and the diameter of the coil at the outlet end of the reversible rolling mill 1 is 1.5m;
the magnetorheological fluid clutch has 2.4 parameters as follows: maximum operating torque 2.0kn m, starting torque (in the uncontrolled state) 0.01kn m; for convenience of explanation, it is assumed that the control current and the working torque are in a linear relationship (actually, a nonlinear relationship), the linear coefficient of the control current is 0.25kn m/a, and the control precision of the working current is 2.0mA;
the work torque distribution of the magnetorheological fluid clutch 2.4 of the inlet coiling machine 2 of the reversible rolling mill 1 is as follows: the actual operating torque of the reel 2.2 is: mj = T × Rj =1.0 × 1.0=1.0kn × m, the average distributed operating torque of each magnetorheological clutch 2.4 is Mci = Mj/I × n = 1/(3*1) =0.333kn × m, and therefore the operating current of each magnetorheological clutch 2.4 is 1.292a; setting the accumulated torque adjustment threshold value of each magnetorheological fluid clutch 2.4 to 0.01KN m;
the three magnetorheological fluid clutches 2.4 of the inlet section coiler 2 are assumed to be A, B, C respectively, and the front and back sequences are A, B, C after random sequencing because the initial working torque is evenly distributed;
in the rolling process, the diameter of a coil on the reel 2.2 is gradually reduced, and meanwhile, the tension of an inlet section is kept unchanged, so that the actual working torque of the magnetorheological fluid clutch 2.4 needs to be controlled to be continuously reduced, otherwise, the tension of the inlet section is increased; when the deviation occurs between the actual tension value detected by the plate type roller 3 according to the set period and the target control value 1.0KN, the control system outputs a feedback control signal through PID control operation, the feedback control signal is led into the reel tension control process, firstly, the control direction of the feedback signal is judged (the forward direction is to increase the working torque, and the reverse direction is to reduce the working torque), and then, the working torque reduction control is carried out on the magnetorheological fluid clutch 2.4A according to the sequence of A, B, C of the magnetorheological fluid clutch 2.4; in each 9 cycles of the feedback control circulation process, whether the torque accumulated adjustment value of the magnetorheological fluid clutch 2.4A exceeds a set threshold value of 0.01KN m or not needs to be judged, and if not, the feedback control circulation of the next cycle is started; when the torque accumulation adjusting value of the magnetorheological fluid clutch 2.4A exceeds the set threshold value of 0.01KN x m in the subsequent control cycle, the working torque sequencing process 8 is re-entered, three magnetorheological fluid clutches 2.4A, B, C are sequenced according to the torque, and the sequencing result is B, C, A (the working torque of A is the minimum, so that the three magnetorheological fluid clutches are arranged in the third position, and the sequencing of B, C is randomly generated);
after the working torque sequencing process 8 of the magnetorheological fluid clutch 2.4 is finished, the feedback control circulation process 9 is entered again, and in the new feedback control circulation process 9, the reverse feedback control is continuously carried out on the working torque of the magnetorheological fluid clutch 2.4B; after passing through a plurality of feedback control circulation flows 9, the torque accumulated adjustment value of the magnetorheological fluid clutch 2.4B exceeds a set threshold value of 0.01kn x m, and then the working torque sequencing flow 8 is re-entered, three magnetorheological fluid clutches 2.4A, B, C are sequenced from new according to the torque magnitude, and the sequencing result is C, A, B (because the working torques of A, B are equal, the sequencing result is C, B, A, wherein the sequencing of A, B is randomly generated);
repeatedly executing the working torque sequencing process 8 and the feedback control circulation process 9 until the first pass rolling of the precision copper foil in the first rolling process is finished; in the process, under the control of the rolling tension control flow of the compound precision copper foil rolling production line, the inlet tension is always stably controlled to be 1.0KN and is kept unchanged;
and (3) analyzing the inlet tension control precision: the working current control precision of the magnetorheological fluid clutch 2.4 is 2.0mA, namely in a feedback control circulation flow 9, the working torque variation of the magnetorheological fluid clutch 2.4 is 0.0005kn × m, the maximum value of the working torque variation of the reel 2.2 caused by the working torque variation is 0.0005kn × m, the maximum variation of the final rolling tension caused by the maximum coil diameter is 2200mm, the control precision is 0.045%, and the control precision is smaller than the control precision requirement of the precision copper foil on the inlet section tension by 0.1% in the first rolling of the first rolling process;
the working torque of the magnetorheological fluid clutch 2.4 of the recoiler 2 at the outlet section of the reversible rolling mill 1 is distributed as follows: the actual operating torque of the reel 2.2 is: mj = T × Rj =1.88 × 0.75=1.41kn × m, and the average distributed operating torque of each magnetorheological clutch 2.4 is Mci = Mj/I × n = 1.41/(3*1) =0.47kn × m, so that the operating current of each magnetorheological clutch 2.4 is 1.84A; setting the cumulative torque adjustment threshold value of each magnetorheological fluid clutch 2.4 to 0.01KN x m;
the three magnetorheological fluid clutches 2.4 of the exit section coiler 2 are assumed to be A, B, C respectively, and the front and back sequences are A, B, C after random sequencing because the initial working torque is evenly distributed;
in the rolling process, the diameter of a coil on the reel 2.2 is gradually increased, and meanwhile, the tension of the outlet section is kept unchanged, so that the actual working torque of the magnetorheological fluid clutch 2.4 needs to be controlled to be continuously increased, otherwise, the tension of the outlet section is reduced; when the deviation occurs between the actual tension value detected by the plate type roller 3 according to the set period and the target control value 1.88KN, the control system outputs a feedback control signal through PID control operation, the feedback control signal is led into a reel tension control process, firstly, the control direction of the feedback signal is judged (the forward direction is to increase the working torque, and the reverse direction is to reduce the working torque), and then, the working torque increasing control is carried out on the magnetorheological fluid clutch 2.4C according to the sequence of A, B, C of the magnetorheological fluid clutch 2.4; in each 9 periods of the feedback control circulation process, whether the torque accumulated adjustment value of the magnetorheological fluid clutch 2.4C exceeds a set threshold value of 0.01KN m or not needs to be judged, and if not, the feedback control circulation of the next period is started; when the torque accumulation adjusting value of the magnetorheological fluid clutch 2.4C exceeds the set threshold value of 0.01KN x m in the subsequent control cycle, the working torque sequencing process 8 is re-entered, three magnetorheological fluid clutches 2.4A, B, C are sequenced according to the torque, and the sequencing result is C, A, B (the working torque of C is the maximum, so that the working torque is arranged at the first position, and the sequencing of A, B is randomly generated);
after the working torque sequencing process 8 of the magnetorheological fluid clutch 2.4 is finished, the feedback control circulation process 9 is entered again, and in the new feedback control circulation process 9, the forward feedback control is continuously carried out on the working torque of the magnetorheological fluid clutch 2.4B; after passing through a plurality of feedback control circulation flows 9, the torque accumulation adjustment value of the magnetorheological fluid clutch 2.4B exceeds a set threshold value of 0.01KN m, at this time, the working torque sequencing flow 8 is re-entered, three magnetorheological fluid clutches 2.4A, B, C are sequenced from beginning to end according to the torque, and the sequencing result is B, C, A (because the working torques of B, C are equal, the sequencing result is C, B, A, the sequencing of B, C is randomly generated);
repeatedly executing the working torque sequencing process 8 and the feedback control circulation process 9 until the precision copper foil is rolled in the first pass of the first rolling process; in the process, under the control of the rolling tension control flow of the precision copper foil rolling production line, the outlet tension is constantly and stably controlled to be 1.88KN and is kept unchanged;
and (3) outlet tension control precision analysis: the working current control accuracy of the magnetorheological fluid clutch 2.4 is 2.0mA, namely in a feedback control circulation flow 9, the working torque variation of the magnetorheological fluid clutch 2.4 is 0.0005kn × m, the maximum value of the working torque variation of the reel 2.2 caused by the working torque variation is 0.0005kn × m, the maximum variation of the rolling tension caused by the maximum coil diameter is 0.00045KN finally calculated according to 2200mm, the control accuracy of the magnetorheological fluid clutch is 0.0239 percent, and the control accuracy is smaller than the control accuracy requirement of a precision copper foil on the tension of an outlet section in the first rolling of the first rolling process by 0.1 percent.
The initial working torque of the magnetorheological fluid clutches 2.4 is distributed, the torque value which is averagely distributed to the magnetorheological fluid clutches 2.4 by the torque required by the actual working of the reel 2.2 is taken as a middle value, and the torque value is randomly distributed to the magnetorheological fluid clutches 2.4 in the form of an arithmetic progression; the difference in the series of equal differences is the torque integrated value that the magnetorheological clutch 2.4 allows to adjust.
The invention is not described in detail in the prior art.
Claims (7)
1. A reversible precision copper foil rolling production line is characterized in that: comprises a reversible rolling mill (1), a coiling machine (2), a plate type roller (3), a laser velocimeter (4), an X-ray thickness gauge (5) and an oil mist cooling device (6); the rolling mill (1) is a 20-roller reversible rolling mill; the oil mist cooling device (6), the X-ray thickness gauge (5), the laser velocimeter (4) and the plate type roll (3) are sequentially and symmetrically arranged at two sides of the reversible rolling mill (1); signals acquired by the plate-shaped roller (3) are fed back to the reversible rolling mill (1) for plate shape control, and signals acquired by the plate-shaped roller are also fed back to the coiler (2) for tension control in the rolling process.
2. The reversible precision copper foil rolling line according to claim 1, wherein: the recoiling machine (2) comprises a frame (2.1), a scroll (2.2), a torque synthesis speed reducer (2.3), a magnetorheological fluid clutch (2.4), a gearbox (2.5) and a motor (2.6); the reel (2.2) is rotatably arranged on the rack (2.1), and the reel (2.2) and the motor (2.6) are in transmission connection through the torque synthesis speed reducer (2.3), the magnetorheological fluid clutch (2.4) and the gearbox (2.5) in sequence.
3. The reversible precision copper foil rolling line according to claim 2, wherein: the torque synthesis speed reducer (2.3) comprises a torque output shaft (2.3.1) and a plurality of torque input shafts (2.3.2), wherein the torque output shaft (2.3.1) is meshed with the plurality of torque input shafts (2.3.2) through gears and is provided with a fixed reduction ratio; the gearbox 2.5 is provided with output shafts with the same number as the torque input shafts (2.3.2) of the torque synthesis speed reducer (2.3); one end part of the scroll (2.2) is fixedly connected with a torque output shaft (2.3.1) of the torque synthesis speed reducer (2.3) through a coupler; a plurality of torque input shafts (2.3.2) of the torque synthesis speed reducer (2.3) are in transmission connection with a plurality of output shafts of a gearbox (2.5) through a plurality of magnetorheological fluid clutches (2.4), and an input shaft of the gearbox 2.5 is in transmission connection with an output shaft of a motor 2.7; working torques of the magnetorheological fluid clutches (2.4) are combined into a larger driving torque through a torque combining speed reducer (2.3), the reel (2.2) is driven to rotate, and the rolling tension output by the reel (2.2) is finally controlled through controlling the combined driving torque.
4. A precision copper foil rolling production process based on the reversible precision copper foil rolling production line of claim 3, characterized in that: the starting rolling thickness is 0.05mm, the finishing rolling thickness is 0.006mm, the rolling process is divided into 3 rolling passes, and each rolling pass has 3-5 rolling passes in total; carrying out reciprocating rolling by adopting a negative roller gap, constant tension and constant rolling speed; wherein the control precision of the inlet tension and the outlet tension of the reversible rolling mill (1) is less than or equal to +/-0.1 percent, and T (T is a tension value).
5. A rolling tension control method based on the reversible precision copper foil rolling production line of claim 3, characterized in that: the working torque of a single one of the magnetorheological fluid clutches (2.4) is controlled by the feedback of the tension signal acquired by the plate-shaped roller (3), so that the rolling tension provided by the reel (2.2) is accurately controlled.
6. The rolling tension control method according to claim 5, wherein: controlling the working torque of a plurality of magnetorheological fluid clutches (2.4) to control the synthesized driving torque; controlling the rolling tension output by the reel (2.2) by the resultant drive torque; the control process comprises the following steps:
s1, setting the working speed of the magnetorheological fluid clutch (2.4): the working speed of the magnetorheological fluid clutch (2.4) is the difference of the rotating speed of the torque input shaft and the torque output shaft; the coiling machine (2) at the outlet end of the reversible rolling mill (1) has the rotating speed of a torque input shaft higher than that of a torque output shaft; a coiler (2) at the inlet end of the reversible rolling mill (1), the rotating speed of a torque input shaft of which is lower than that of a torque output shaft; the rotating speed difference between the torque input shaft and the torque output shaft is set and maintained between 20 rpm and 80 rpm;
s2, distributing the working torque of the magnetorheological fluid clutch (2.4): the initial working torque is averagely distributed to a plurality of magnetorheological fluid clutches (2.4) by the torque required by the actual working of the reel (2.2), and the calculation formula is as follows:
Mci=Mj/I*n ......(1)
Mj=T*Rj ......(2)
wherein: mci torque distributed to a single magnetorheological fluid clutch (2.4); mj is the torque required by the actual operation of the reel (2.2); i is the transmission ratio between the output shaft of the magnetorheological fluid clutch (2.4) and the reel (2.2); n is the number of the magnetorheological fluid clutches (2.4); t is rolling tension; rj is the outer diameter of the copper strip coil on the reel (2.2);
s3, controlling the working torque of the magnetorheological fluid clutch (2.4): the working torques of the magnetorheological fluid clutches (2.4) are fed back by tension signals collected by the plate-shaped roller (3) to form PID control; in the feedback control process, only one of the magnetorheological fluid clutches (2.4) is subjected to working torque adjustment control; the torque accumulation adjusting value of one magnetorheological fluid clutch (2.4) is set with a threshold value, and when the torque accumulation adjusting value of the feedback-controlled magnetorheological fluid clutch (2.4) reaches or exceeds the set threshold value, the feedback control process starts to perform feedback control on the other magnetorheological fluid clutch (2.4) according to the set sequence; and analogizing in turn, and realizing the feedback control of each magnetorheological fluid clutch (2.4) in the whole feedback control process.
7. The rolling tension control method according to claim 8, wherein: the initial working torque distribution of the magnetorheological fluid clutches (2.4), the torque value averagely distributed to the plurality of magnetorheological fluid clutches (2.4) by the torque required by the actual working of the reel (2.2) is a middle value, and the torque value is randomly distributed to the plurality of magnetorheological fluid clutches (2.4) in the form of an arithmetic progression; the difference value of the series of equal difference values is the torque accumulated value which is allowed to be adjusted by the magnetorheological fluid clutch (2.4).
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