CN115647049A - Precision copper plate and strip rolling production line, production process and tension control method - Google Patents
Precision copper plate and strip rolling production line, production process and tension control method Download PDFInfo
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Abstract
A rolling mill of the precision copper plate and strip rolling production line adopts a four-roller system structure, two sides of the rolling mill are symmetrically provided with an intermediate product coiler, a coiled material heating furnace is arranged outside a reel of the intermediate product coiler, a tension detection roller and a cooling device are arranged between the coiler and the rolling mill, and a high-temperature solid solution system is arranged between a finished product coiler and the adjacent intermediate product coiler; the four-roller rolling mill is matched with the tension detection roller to accurately control the rolling tension parameters in the copper strip rough rolling process, so that the dimensional accuracy of the copper strip after rough rolling is greatly improved; the coiled material heating furnace heats and preserves the heat of the copper strip, changes the original copper strip rough rolling process from cold rough rolling into hot rough rolling, and simultaneously cooperates with a high-temperature solid solution system to greatly improve the residual stress and the microstructure of the copper strip after rough rolling, thereby obtaining the 'precise copper strip' with high dimensional precision, low residual stress and good microstructure.
Description
Technical Field
The invention relates to the technical field of non-ferrous metal precision strip foil production, in particular to a precision copper strip 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 and the like; with the continuous development of the technology, the quality requirements for copper strips in the fields of aerospace, national defense and military industry, military equipment, modern communication, electronic information and the like are higher and higher, wherein the requirements for the copper strips include the dimensional precision, residual stress, surface finish, anisotropy, elongation, strength, dielectric constant, corrosion resistance, high temperature resistance and creep resistance of the copper strips, and the high-grade copper strips are also called as 'precision strip foils' in the domestic and foreign industries.
The guarantee of the final quality of the 'precision strip foil' is not determined in the final finish rolling, surface treatment and heat treatment production, but is determined by the whole process of copper blank hot rolling, copper strip rough rolling, middle rolling, copper foil finish rolling, surface treatment and heat treatment production which runs through the 'precision strip foil', namely the copper blank hot rolling and the copper strip rough rolling also have great influence on the quality of the final 'precision strip foil', in particular the size precision, residual stress and microstructure organization of the copper strip after the rough rolling production have the greatest influence on the quality of the subsequent 'precision strip foil' rolling production; at present, due to the limitation of production equipment and process design (the rough rolling of the copper strip mostly adopts a cold rough rolling process), and the recognition that the dimensional precision, residual stress and microstructure organization of the copper strip after the rough rolling production have influence on the final quality of the subsequent precision strip foil production is insufficient, few enterprises which can produce precision copper strips with high dimensional precision, low residual stress and good microstructure organization are few in China, and the problem of the matching of the quality of the front-end copper strips and the final precision strip foil production is caused, so that the technology blind spot of the precision strip foil production in China is formed.
At present, the import amount of the 'precision band foil' accounts for more than 90% of the consumption amount of the 'precision band foil' in China, so how to ensure the matching between the quality of a front-end 'precision copper plate band' and the production of a rear-end 'precision band foil' solves the technical blind point of the 'precision band foil' production, promotes the domestic import substitution, and becomes one of the key problems to be solved urgently in the 'precision band foil' production.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention discloses a precision copper plate and strip rolling production line, a production process and a tension control method; the rolling mill of the precision copper plate strip rolling production line adopts a four-roll system structure, two sides of the rolling mill are symmetrically provided with an intermediate product coiler, a coiled material heating furnace is arranged outside a reel of the intermediate product coiler, a tension detection roll and a cooling device are arranged between the coiler and the rolling mill, and a high-temperature solid solution system is arranged between a finished product coiler and an adjacent intermediate product coiler, so that the production from copper blank hot rolling to copper strip hot rough rolling can be completed on the production line at one time; the four-roller rolling mill is matched with the tension detection roller to accurately control the tension parameters in the copper strip rough rolling process, so that the dimensional accuracy of the copper strip after rough rolling is greatly improved; the coiled material heating furnace heats and preserves the copper strip, changes the original copper strip rough rolling process from cold rough rolling into hot rough rolling, and is matched with a high-temperature solid solution system, so that the residual stress and the microstructure of the copper strip after rough rolling are greatly improved, the problem of matching of the quality of the front-end precise copper strip and the production of the rear-end precise foil is solved, the technical blind spot of the domestic current production of the precise foil is solved, and a good foundation is laid for domestic production of the precise foil.
In order to realize the purpose, the invention adopts the following technical scheme: a rolling production line of precision copper plates and strips comprises a roller way and a rolling mill arranged in the middle section of the roller way; the rolling mill adopts a four-roll system structure, and the outer sides of the working rolls of the original rolling mill are respectively added with a supporting roll, so that the diameter of the original working rolls is reduced, and the rolling mill can meet the technological requirements of copper blank hot rolling and copper strip rough rolling; the two sides of the rolling mill are symmetrically provided with an intermediate product coiling machine, the thickness of a coiled copper strip of the intermediate product coiling machine 2 is 3 to 28mm, and the maximum coiling external diameter is 2500mm; the distance between the intermediate product coiler and the rolling mill is set to be 5-12m, a coil heating furnace is arranged outside a reel of the intermediate product coiler, the heating temperature range of the coil heating furnace is 600-1000 ℃, and protective gases such as nitrogen, argon and the like are configured at the same time; after the copper billet is rolled, the copper billet is coiled in an intermediate product coiling machine, and simultaneously, the copper billet is heated in a coiled material heating furnace in a heat preservation way, and the hot rough rolling of the copper strip is continuously carried out, so that the improvement of the process brings two beneficial effects: 1. the residual heat after the copper billet is hot-rolled is utilized to continuously carry out the hot rolling of the copper strip, the original cooling process after the copper billet is hot-rolled is omitted, and the residual heat after the copper billet is hot-rolled can be fully utilized, so that the energy consumption is reduced; 2. the cold rough rolling of the copper strip is changed into hot rough rolling, so that the residual stress of the copper strip after the cold rough rolling is reduced; the coiler and the rolling mill are provided with a tension detection roller, a cooling device and a coiler guide roller; the tension detection roller is used for detecting the rolling tension in the hot rough rolling of the copper strip, so that the tension control precision of the hot rough rolling is improved, and the size control precision of the hot rough rolling is further improved; the cooling device is used for rapidly cooling after the hot rough rolling is finished, so that the microstructure of the copper strip after the hot rough rolling is improved; the guide roller of the coiling machine is used for ensuring the wrap angle of the copper strip on the tension detection roller and improving the detection precision of the tension detection roller; a finished product coiling machine is arranged at one end of the roller way, a high-temperature solid solution system is arranged between the finished product coiling machine and the adjacent intermediate product coiling machine, the copper strip after rough rolling can be subjected to online high-temperature solid solution treatment, and the microstructure of the copper strip after hot rough rolling is further improved; the high-temperature solid solution system and the finished product coiler are provided with a butt-joint welding device, and the butt-joint welding device is used for connecting the hot and rough rolled copper strip on line to form a hot rolled copper strip coil with a larger size; the precision copper plate strip rolling production line can produce a hot-rolled copper plate with the thickness of 12-20mm, and can also produce a precision hot-rolled copper strip with the thickness of 1-4mm, so that the production quality is ensured, the subsequent cold rolling processing amount is reduced, and the production flow is shortened; more subsequent cold rolling processes of the copper plate strip are distributed in the hot rolling process stage, so that the total energy consumption of copper plate strip production is reduced, the equipment investment of subsequent copper strip cold rolling and intermediate annealing is reduced, and the total processing process flow of the precise copper strip foil is shortened.
Furthermore, the rolling mill comprises two pairs of working roll systems which are symmetrically arranged up and down, each working roll system comprises a working roll and a supporting roll, the diameter of each working roll is 200-400mm, the diameter of each supporting roll is 400-900mm, and the supporting rolls are symmetrically arranged at the outer sides of the rolling gaps of the two working rolls and used for supporting and reinforcing the rigidity of the working rolls; in the metal rolling production, the diameter of a roller has a direct relation with the thickness of a plate strip which can be finally produced, namely the larger the diameter of the roller is, the smaller the minimum thickness of the copper strip which can be finally rolled and produced is also about large, so that the traditional copper billet rolling production line is limited by the larger diameter of the roller, and can only be used for hot rolling of a copper billet but cannot finish the rolling processing of a precision copper strip with a thinner thickness; after the diameter of the working roll is reduced, the rigidity of the working roll is reinforced by the supporting roll.
Furthermore, the tension detection roller is a solid roller, two groups of pressure sensors are uniformly distributed around the axis, and the two groups of pressure sensors are symmetrically arranged in the axis direction; in actual work, the average value of the output values of the two groups of pressure sensors is taken as the acquisition value of the tension detection sensor so as to improve the stability of data acquisition; the roller body of the tension detection roller is of an integral structure, and the pressure sensor is axially arranged in the roller body of the tension detection roller.
Furthermore, a plurality of magnetorheological fluid clutches are arranged in a driving transmission chain of a reel of the intermediate product coiler, the plurality of magnetorheological fluid clutches are combined to drive a reel to rotate through driving torque, and rolling tension output by the reel is controlled by controlling the size of the combined driving torque; in the invention, the traditional control structure for controlling the rolling tension by controlling the rotation speed difference between the reel and the working roll or the driving torque of the reel driving motor is changed, and the rolling tension is controlled by directly controlling the torque of the reel by adopting the magnetorheological fluid clutch, so that 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; in addition, the torque for driving the reel is synthesized by adopting a plurality of magnetorheological fluid clutches, because the maximum torque provided by the existing magnetorheological fluid clutches is smaller, and the rolling tension required by hot rough rolling of the copper strip is larger, the problem that the one magnetorheological fluid clutch can not provide enough torque for the reel at present can not be realized.
A precision copper strip rolling production process of the precision copper strip rolling production line comprises precision copper plate hot rolling, precision copper strip hot rough rolling and high-temperature solution heat treatment; the hot rolling of the precision copper plate, the hot rough rolling of the precision copper strip and the high-temperature solution heat treatment are all completed on a precision copper plate and strip rolling production line; when the precise copper strip rolling production process is actually implemented, the precise copper strip rolling production process can be implemented by combining, and finally a precise copper strip with the thickness of 1.4mm is produced on a precise copper strip rolling production line; or independently performing the precise copper plate hot rolling, for example, only performing the precise copper plate hot rolling on a precise copper plate strip rolling production line to finally produce a copper plate material with the thickness of 12-20mm, and directly coiling the copper plate material in a finished product coiler after the copper plate material is cooled on line by a cooling device.
Further, performing hot rolling on a precision copper plate to reversibly roll the copper and copper alloy cast ingot to 12-20mm in a reciprocating manner, and coiling the copper and copper alloy cast ingot in an intermediate product coiling machine; the precision copper strip hot rough rolling is used for reversibly rolling a copper plate coil of 12-20mm to 1-4mm in a reciprocating manner, and the copper plate coil is heated on line by a coil heating furnace in the rolling process, so that the rolling temperature is kept; before the high-temperature solution heat treatment, the copper strip coil is heated on line by a coil heating furnace, and finally coiled by a finished product coiling machine after the copper strip coil is subjected to the on-line high-temperature solution heat treatment by a high-temperature solution system.
A rolling tension control method based on a precision copper plate strip rolling production line controls the working torque of a single magnetorheological fluid clutch in a plurality of magnetorheological fluid clutches through the feedback of tension signals collected by a tension detection roller, so that the precise control of the rolling tension provided by a reel is realized; 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 meanwhile, a 3:1 speed reduction ratio is arranged between an output shaft of the magnetorheological fluid clutches and a torque output shaft (reel) of the torque synthesis speed reducer so as to improve the final output torque of the reel, so that the adjustment control quantity of the working torque of the magnetorheological fluid clutches is actually amplified through the speed reduction ratio; 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 between the rotating speeds of the torque input shaft and the torque output shaft, and the difference between the rotating speeds of the torque input shaft and the torque output shaft is set to be maintained between 20 rpm and 80 rpm;
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 tension detection rollers to form PID control; in the feedback control process, only one of the magnetorheological fluid clutches is subjected to working torque adjustment control, and a torque accumulation adjustment value of one magnetorheological fluid clutch is set to be a threshold value; when the torque accumulated adjustment value of the feedback-controlled magnetorheological fluid clutch reaches or exceeds a set threshold value, the feedback control carries out feedback control on the other magnetorheological fluid clutch according to the set order of the magnetorheological fluid clutches; by analogy, the feedback control of the working torque of each magnetorheological fluid clutch is realized in the whole feedback control process;
the control flow of the roll output rolling tension Cheng Juti is described in the specification with reference to fig. 6.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the invention discloses a precision copper plate and strip rolling production line, a production process and a tension control method; the rolling mill of the precision copper plate strip rolling production line adopts a four-roll system structure, the two sides of the rolling mill are symmetrically provided with an intermediate product coiling machine, the outside of a scroll of the intermediate product coiling machine is provided with a coiled material heating furnace, a tension detection roll and a cooling device are arranged between the coiling machine and the rolling mill, and a high-temperature solid solution system is arranged between a finished product coiling machine and an adjacent intermediate product coiling machine, so that the production from copper blank hot rolling to copper strip hot rough rolling can be completed on the production line at one time; the four-roller rolling mill is matched with the tension detection roller to accurately control the rolling tension parameters in the copper strip rough rolling process, so that the dimensional accuracy of the copper strip after rough rolling is greatly improved; the coiled material heating furnace heats and preserves the copper strip, changes the original copper strip rough rolling process from cold rough rolling into hot rough rolling, and is matched with a high-temperature solid solution system, so that the residual stress and the microstructure of the copper strip after rough rolling are greatly improved, the problem of matching of the quality of the front-end precise copper strip and the production of the rear-end precise foil is solved, the technical blind spot of the domestic current production of the precise foil is solved, and a good foundation is laid for domestic production of the precise foil.
Drawings
FIG. 1 is a schematic structural diagram of a precision copper strip rolling production line;
FIG. 2 is a schematic view of the transmission structure of the intermediate product coiler;
FIG. 3 is a schematic view of a circumferential arrangement structure of tension detection roller pressure sensors;
FIG. 4 is a schematic view of an axial arrangement structure of a tension detection roller pressure sensor;
FIG. 5 is a schematic view of the intermediate product coiler mandrel drive system;
fig. 6 is a schematic diagram of a reel tension control flow path.
In the figure: 1. a rolling mill; 2. an intermediate product 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; 2.3.1.3, a heat dissipation plate; 2.3.2, torque input shaft; 2.3.2.1, input shaft gear; 2.3.2.2, an input shaft coupling; 2.4, a magnetorheological fluid clutch; 2.5, a gearbox; 2.6, a motor; 3. a coil heating furnace; 4. a tension detecting roller; 4.1, axially arranging holes on the pressure sensor; 4.2, a pressure sensor axial arrangement area; 5. a coiler guide roller; 6. a cooling device; 7. a high temperature solid solution system; 8. a butt welding device; 9. a finished product coiling machine; 10. an initial torque distribution process; 11. working torque sequencing process of the magnetorheological fluid clutch; 12. 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 precision copper plate and strip rolling production line comprises a roller way, a rolling mill 1, an intermediate product coiler 2, a coiled material heating furnace 3, a tension detection roller 4, a coiler guide roller 5, a cooling device 6, a high-temperature solid solution system 7, a butt welding device 8 and a finished product coiler 9; the rolling mill 1 comprises two pairs of working roll systems which are symmetrically arranged up and down, each working roll system comprises a working roll with the diameter of 300mm and a supporting roll with the diameter of 800mm, the supporting rolls are symmetrically arranged at the outer sides of a rolling gap of the two working rolls, and the working rolls are arranged in contact with the outer circumferential surface of the supporting roll; the rolling mill 1 is arranged at the middle section of the roller way; the two intermediate product coiling machines 2 are symmetrically arranged at two sides of the rolling mill 1 and are 12m away from the rolling mill; the coil heating furnace 3 is arranged outside the reel 2.2 of the intermediate product coiler 2; the tension detection roller 4, the cooling device 6 and the coiler guide roller 5 are sequentially arranged between the coiler 2 and the rolling mill 1; the finished product coiling machine 9 is arranged at one end of the roller way, and the high-temperature solid solution system 7 is arranged between the finished product coiling machine 9 and the adjacent intermediate product coiling machine 2 and is close to the finished product coiling machine 9; the butt welding device 8 is arranged between the high-temperature solid solution system 7 and the finished product coiling machine 9;
the tension detection roller 4 is a solid roller with the diameter of 300mm, two groups of pressure sensors are uniformly distributed in the circumferential direction of the solid roller, the axial distance between the two groups of pressure sensors is 80mm, 20 pressure sensors are arranged in each group, the two groups of pressure sensors are symmetrically arranged in the length direction of the tension detection roller 4, and the two groups of pressure sensors are axially arranged in a roller body of the tension detection roller 4 along the tension detection roller 4;
the intermediate product coiler 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 2.7; the scroll 2.2 is rotationally arranged on the frame 2.1; the end part of the right side of the torque converter 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 gears, the torque synthesis speed reducer is provided with a reduction ratio of 3:1, and the maximum working torque of the magnetorheological fluid clutch 2.4 is 2.KN 0x m; the input shaft of the gearbox 2.5 is in transmission connection with the motor 2.7;
the precision copper plate and strip rolling production line adopts a magnetorheological fluid clutch 2.4 to directly control the torque of a reel 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 in the three magnetorheological fluid clutches 2.4 is controlled in turn by the feedback signal of the tension detection roller 4 to achieve the purpose of controlling the driving torque of the reel 2.2, thereby ensuring that the rolling tension provided by the reel 2.2 is kept constant in the hot rough rolling process of the copper strip; 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 copper strip hot rolling process can be greatly improved, and the stability of the dimensional precision of the copper strip after hot rough rolling is ensured;
when the right side end of the scroll 2.2 is connected with the torque output shaft 2.3.1 of the torque synthesis speed reducer 2.3, a heat insulation block is fixedly arranged in the middle of the coupler and used for preventing the high temperature of the scroll 2.2 from being transmitted to the torque output shaft 2.3.1 of the torque synthesis speed reducer 2.3; the end face of the right side of the coupler is also provided with a heat dissipation disc 2.3.1.3, the end face of the right side of the heat dissipation disc 2.3.1.3 is provided with heat dissipation fins, and when the torque output shaft 2.3.1 of the torque synthesis speed reducer 2.3 rotates, the heat dissipation fins of the heat dissipation disc 2.3.1.3 drive air to form heat dissipation airflow to dissipate heat of the coupler and the torque output shaft 2.3.1.
A precise copper strip rolling production process of a precise copper strip rolling production line comprises precise copper plate hot rolling, precise copper strip hot rough rolling and high-temperature solution heat treatment; the hot rolling of the precision copper plate, the hot rough rolling of the precision copper strip and the high-temperature solution heat treatment are all completed on a precision copper plate and strip rolling production line; the precision copper plate is hot rolled, copper and copper alloy cast ingots are reversibly rolled to 12-20mm in a reciprocating mode, and are coiled in an intermediate product coiling machine 2; the precision copper strip hot rough rolling is used for reversibly rolling a copper plate coil of 12-20mm to 1-4mm in a reciprocating manner, and the copper plate coil is heated on line by a coil heating furnace 3 in the rolling process to keep the rolling temperature; before the high-temperature solution heat treatment, the copper strip coil is heated on line by a coil heating furnace 3, and finally coiled by a finished product coiler 9 after the copper strip coil is subjected to the on-line high-temperature solution heat treatment by a high-temperature solution system 7;
taking a precision copper strip with the finish rolling thickness of 1.5mm produced by pure copper C11000 as an example, the specific production process parameters are as follows: the specification of a pure copper C11000 blank is 300mm in thickness and 9000mm in length, the pure copper C11000 blank is heated to 950 ℃ in a stepping heating furnace, and the temperature uniformity of the blank is 950 +/-6 ℃; the stepping precision of the blank in the furnace is 1.8 mm/time, the heating internal pressure in the reducing atmosphere is 80kPa, and the pressure control precision value is +/-4 Pa;
the blank is discharged from the furnace and is reversibly rolled to the thickness of 15mm in 5~9 passes, the deviation of the hydraulic pressing precision of the constant roll gap value during each pass is +/-0.6 mu m, such as 15mm +/-0.6 mu m during the finished product pass; the rolling speed is gradually increased within the range of 90 to 200m/min, the speed control precision is +/-0.1 percent V (V is the running speed of the rolling mill and is between 90 to 200m/min); the bending value in the length direction in the rolling process is 0.5 mm/m, the total length range is not more than 25mm, the transverse thickness deviation of the strip is 15mm +/-0.012 mm, the longitudinal thickness deviation is 15mm +/-0.018 mm, and the rolled plate shape convexity value is 85I; the final rolling temperature is 530 ℃;
heating and insulating the hot-rolled strip blank in a heating furnace 3, and performing precise copper strip hot rough rolling; the thickness of the hot rough rolling finished product is 1.5mm, the rolling passes are 7~9, and the rolling tension of each pass is at high speedThe tension precision is within the range of +/-1% of the maximum value of the actual tension, and the tension precision is within the range of 7-70kN, and is within the range of 14-140kN or 18-180kN at low speed; the inner diameter of the rolled coil is phi 610mm, the outer diameter of the coil is phi 1850 mm, the stacking fault value of the coil between the inner diameter and the outer diameter is +/-0.5 mm, and the total tower shape of the coil is +/-5 mm; the thickness deviation of the strip is 1.5mm +/-0.001 mm, the rolled plate shape convexity value is 45I, and the surface residual oil amount of the strip is 115mg/m 2 ；
And heating the material coil after final rolling in a high-temperature solid solution system 7 to 600-1050 ℃, reducing the temperature to below 200-400 ℃ within 1-2.5 minutes, and finally coiling the material coil by a finished product coiling machine 9.
Taking high-copper alloy C19040 as an example for producing a copper plate with the final rolling thickness of 15.5mm, the specific production process parameters are as follows: the specification of the high copper alloy C19040 and high copper alloy C19040 alloy blank is 200mm in thickness and 6000mm in length, the blank is heated to 1020 ℃ in a stepping heating furnace, and the temperature uniformity of the blank is 1020 +/-7 ℃. The stepping precision of the blank in the furnace is 1.5 mm/time, the heating internal pressure in the reducing atmosphere is 75kPa, and the pressure control precision value is +/-3 Pa;
the C19040 alloy blank is discharged from a furnace and is reversibly rolled to a thickness of 15.5mm in 5~9 passes, and the deviation of the hydraulic pressing precision of the constant roll gap value during each pass is +/-0.55 mu m, such as 15.5mm +/-0.55 mu m during the finished product pass; the rolling speed is gradually increased within the range of 90 to 180m/min, and the speed control precision is +/-0.08 percent V (V is the running speed of the rolling mill and is between 90 to 180m/min); the bending value in the length direction in the rolling process is 0.48 mm/m, the total length range is not more than 20mm, the transverse thickness deviation of the strip is 15.5mm +/-0.01 mm, the longitudinal thickness deviation is 15.5mm +/-0.012 mm, and the rolled plate shape convexity value is 80I; and finally, carrying out on-line cooling to room temperature when the final rolling temperature is ensured to be 750 ℃, and finally coiling by a finished product coiling machine 9.
A rolling tension control method based on a precision copper plate strip rolling production line synthesizes driving torque through working torque actually provided by a plurality of magnetorheological fluid clutches 2.4; the working torque of a single magnetorheological fluid clutch 2.4 is controlled and adjusted through the tension signal feedback control collected by the tension detection roller 4, the control and adjustment of the synthesized driving torque are realized, and the synthesized torque which is controlled and adjusted finally controls the rolling tension output by the reel 2.2, wherein 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 between the rotating speeds of the torque input shaft and the torque output shaft, and the difference between the rotating speeds of the torque input shaft and the torque output shaft is set to be maintained at 30rpm;
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 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 controlled by PID according to tension signals collected by the tension detection roller 4; in the feedback control process, only one of the magnetorheological fluid clutches 2.4 is subjected to working torque adjustment control, and 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 precision copper plate and strip rolling production line, the control method actually comprises the control of the 2.2 rotating speed of the reel, and the control structure and the control method are basically the same as those in the prior art and are not described in detail herein; the difference lies in that: compared with the existing control of the rotating speed of the reel 2.2, the calculated rotating speed of the motor is properly increased, the rotating speed difference between the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4 is ensured to be maintained between 20 rpm and 80rpm, generally, in order to reduce the heat generation of the magnetorheological fluid clutch 2.4 in the working process, the rotating speed difference between the torque input shaft and the torque output shaft is set to be close to the lower limit and is generally set to be 30rpm; for example, the hot rough rolling speed of the copper strip is 150 m/min, the coiling outer diameter of the reel shaft 2.2 is 2m, the rotating speed of the reel shaft 2.2 is calculated to be 23.885rpm, the rotating speed of the torque input shaft 2.3.2 of the torque synthesis speed reducer 2.3 is calculated to be 71.656rpm according to the reduction ratio of 3:1 between the torque input shaft 2.3.2 and the torque output shaft 2.3.1 of the torque synthesis speed reducer 2.3, and the rotating speed of the torque input shaft of the magnetorheological fluid clutch 2.4 is 101.656rpm according to the rotating speed difference of the torque input shaft and the torque output shaft of the magnetorheological fluid clutch 2.4; assuming that the reduction ratio of the gearbox 2.5 is 10, the finally calculated rotation speed of the motor 2.6 is 1016.56rpm;
the rolling tension control process of the precision copper plate and strip rolling production line specifically refers to the attached figure 6 of the specification, and the rolling tension control process actually comprises an initial torque distribution process 10, a magnetorheological fluid clutch 2.4 working torque sequencing process 11 and a feedback control circulation process 12; the control process of the rolling tension of the precision copper strip in the hot rough rolling process is described below by taking the final pass rolling of the copper strip in the hot rough rolling as an example, and the rolling parameters are as follows:
the thickness of the hot rough rolling copper strip finished product is 1.5mm, and the thickness deviation is +/-0.001 mm; the inner diameter of the coil is 610mm, and the outer diameter of the coil is phi 1850 mm; the coiling speed is 5m/min, the rolling speed is 180m/min, and the acceleration time is 30s; the coiling tension is 1.0KN, the rolling tension is 10KN, and the allowable fluctuation range of the rolling tension is +/-0.5%;
the magnetorheological fluid clutch has 2.4 parameters as follows: maximum operating torque 2.0kn m, starting torque (in non-control 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 10.0mA;
initial torque distribution process 10: the three magnetorheological fluid clutches 2.4 work torque distribution during the reeling-up is as follows: the actual working torque of the reel 2.2 during reeling up is: mj = T × Rj =1.0 × 0.305=0.305kn × m, the average distributed operating torque of each magnetorheological clutch 2.4 is Mci = Mj/I × n = 0.305/(3*3) =0.0339kn × m, and therefore the operating current of each magnetorheological clutch 2.4 is 95.6mA; setting the accumulated torque adjustment threshold value of each magnetorheological fluid clutch 2.4 to 0.01KN m;
the magnetorheological fluid clutch 2.4 working torque sequencing process 11: assuming that the three magnetorheological fluid clutches 2.4 are A, B, C respectively, the front and back sequences are A, B, C after random sequencing because the initial working torque is evenly distributed;
feedback control loop flow 12: along with the gradual increase of the rotating speed of the working roll, the rotating speed of the reel 2.2 and the rolling tension are also gradually increased, and a target value after the rolling tension is increased is given by a control system; when the actual tension value detected by the tension detection roller 4 according to a set period is deviated from the target value after the rolling tension is increased, the control system outputs a feedback control signal through PID control operation, the feedback control signal is led into a reel tension control process, the control direction of the feedback signal is firstly judged (the forward direction is to increase the working torque, and the reverse direction is to decrease the working torque), and then the working torque is controlled to be increased for the magnetorheological fluid clutch 2.4C according to the arranged A, B, C sequence of the magnetorheological fluid clutch 2.4; in each 12 cycles of the feedback control loop process, whether the torque accumulated adjustment value of the magnetorheological fluid clutch 2.4C exceeds a set threshold value of 0.01KN x m needs to be judged, and if not, the feedback control loop of the next cycle 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 11 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 11 of the magnetorheological fluid clutch 2.4 is finished, the feedback control circulation process 12 is entered again, and in the new feedback control circulation process 12, 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 12, 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 11 is re-entered, three magnetorheological fluid clutches 2.4A, B, C are sequenced from beginning to end according to the torque magnitude, and the sequencing result is B, C, A (or because the working torques of C, B are equal, the sequencing result is C, B, A, the sequencing of C, B is randomly generated);
repeatedly executing the working torque sequencing flow 11 and the feedback control circulation flow 12, gradually enabling the final pass rolling of the hot rough rolling copper strip to enter a stable rolling stage from a coiling stage, wherein in the process, the working torque of the three magnetorheological fluid clutches 2.4A, B, C is increased to more than 1.1KN m from the initial 0.0339KN m (the diameter of the strip coil is increased, and the actual working torque of the three magnetorheological fluid clutches 2.4A, B, C can exceed 1.1KN m when the strip coil enters the stable rolling stage); after entering a stable rolling stage, along with the continuous increase of the diameter of a coil, the actual working torque of the three magnetorheological fluid clutches 2.4A, B, C can be continuously increased, and the rolling tension is always stably controlled to be constant at 10KN under the control of the rolling tension control flow of a precise copper strip rolling production line;
and (3) analyzing the control precision of the rolling tension: taking the rolling tension control in the stable rolling stage as an example, the working current control precision of the magnetorheological fluid clutch 2.4 is 10.0mA, that is, in a feedback control circulation flow 12, the working torque variation of the magnetorheological fluid clutch 2.4 is 0.0025kn × m, the working torque variation of the reel 2.2 caused by the working torque variation is 0.0075kn × m, the maximum variation of the rolling tension finally caused by calculation of the maximum coil diameter 1450mm is 0.00544KN, the control precision is 0.0544%, which is far higher than the +/-0.5% range of the fluctuation allowed by the rolling tension in the final pass of the hot rough rolling of the precise copper strip, and therefore, the extremely high rolling tension control precision fully ensures the size precision of the precise copper strip after rough rolling.
The invention is not described in detail in the prior art.
Claims (8)
1. A precise copper plate and strip rolling production line comprises a roller way and a rolling mill (1) arranged in the middle section of the roller way; the method is characterized in that: the rolling mill (1) is of a four-roller system structure; the two sides of the rolling mill (1) are symmetrically provided with an intermediate product coiler (2), and a coil heating furnace (3) is arranged outside a reel (2.2) of the intermediate product coiler (2); a tension detection roller (4), a cooling device (6) and a coiler guide roller (5) are arranged between the coiler (2) and the rolling mill (1); a finished product coiling machine (9) is arranged at one end of the roller way, and a high-temperature solid solution system (7) is arranged between the finished product coiling machine (9) and the adjacent intermediate product coiling machine (2); the high-temperature solid solution system (7) and the finished product coiling machine (9) are provided with butt-joint tailor-welding devices (8).
2. The precision copper plate and strip rolling line of claim 1, wherein: the rolling mill (1) comprises two pairs of working roll systems which are symmetrically arranged up and down, each working roll system comprises a working roll and a supporting roll, and the supporting rolls are symmetrically arranged on the outer sides of rolling gaps of the two working rolls.
3. The precision copper plate and strip rolling line of claim 2, wherein: the tension detection roller (4) is a solid roller, and two groups of pressure sensors are uniformly distributed in the circumferential direction and are axially symmetrical; the pressure sensor is axially arranged in a roller body of the tension detection roller (4).
4. A precision copper strip rolling line according to claim 3, wherein: a plurality of magnetorheological fluid clutches (2.4) are arranged in a driving transmission chain of a reel (2.2) of the intermediate product coiler (2), a driving torque is synthesized through the plurality of magnetorheological fluid clutches (2.4) to drive the reel (2.2) to rotate, and the rolling tension output by the reel (2.2) is finally controlled through controlling the synthesized driving torque.
5. A precision copper strip rolling production process based on the precision copper strip rolling production line of claim 4, which is characterized by comprising the following steps of: comprises the steps of hot rolling of a precision copper plate, hot rough rolling of a precision copper strip and high-temperature solution heat treatment; the hot rolling of the precision copper plate, the hot rough rolling of the precision copper strip and the high-temperature solution heat treatment are all completed on a precision copper plate and strip rolling production line.
6. The precision copper strip rolling production process according to claim 5, characterized in that: performing hot rolling on a precision copper plate, performing reciprocating reversible rolling on the copper and copper alloy cast ingots to 12-20mm, and coiling in an intermediate product coiler (2); the precision copper strip hot rough rolling is used for reversibly rolling a copper plate coil of 12-20mm to 1-4mm in a reciprocating manner, and the copper plate coil is heated on line by a coil heating furnace (3) in the rolling process to keep the rolling temperature; before the high-temperature solution heat treatment, the copper strip coil is heated on line by a coil heating furnace (3), and finally coiled in a finished product coiling machine (9) after the copper strip coil is subjected to the on-line high-temperature solution heat treatment by a high-temperature solution system (7).
7. A rolling tension control method based on the precision copper strip rolling production line of claim 4 is characterized by comprising the following steps: the working torque of a single one of the magnetorheological fluid clutches (2.4) is controlled in a feedback manner through the tension signal acquired by the tension detection roller (4), so that the rolling tension provided by the reel (2.2) is accurately controlled.
8. The rolling tension control method according to claim 7, wherein: controlling the working torque actually provided by 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 between the rotating speeds of the torque input shaft and the torque output shaft, and the difference between the rotating speeds of the torque input shaft and the torque output shaft is set to be 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 is the torque distributed by 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 acquired by the tension detection rollers (4) 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 a 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; and analogizing in turn, and realizing the feedback control of each magnetorheological fluid clutch (2.4) in the whole feedback control process.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024088405A1 (en) * | 2022-10-28 | 2024-05-02 | 中色科技股份有限公司 | Coiling machine structure capable of accurately controlling reel torque and reel torque control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024088405A1 (en) * | 2022-10-28 | 2024-05-02 | 中色科技股份有限公司 | Coiling machine structure capable of accurately controlling reel torque and reel torque control method |
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