CN110202002B - High-magnetic-induction cold-rolled silicon steel equipment and control method - Google Patents
High-magnetic-induction cold-rolled silicon steel equipment and control method Download PDFInfo
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- CN110202002B CN110202002B CN201910599163.9A CN201910599163A CN110202002B CN 110202002 B CN110202002 B CN 110202002B CN 201910599163 A CN201910599163 A CN 201910599163A CN 110202002 B CN110202002 B CN 110202002B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/36—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
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Abstract
The invention belongs to the technical field of cold-rolled silicon steel processes, and relates to a high-magnetic-induction cold-rolled silicon steel device and a control method thereof, which comprises a roller, wherein a coiling machine and a roller are uniformly arranged on two sides of the roller, a pressing oil cylinder and a detector are arranged on the top of the roller, a rolling motor, a frequency converter and a velocimeter are arranged on the bottom of the roller, an emulsion pipeline is connected with the roller, a pressure gauge, a flow meter and an adjusting valve are arranged on the emulsion pipeline, and a thermometer and a thickness gauge are uniformly arranged above two sides of a silicon steel plate. The thickness and the plate shape of the silicon steel are ensured to meet the requirements, and the high magnetic induction performance of the silicon steel is ensured.
Description
Technical Field
The invention belongs to the technical field of cold-rolled silicon steel processes, and particularly relates to high-magnetic-induction cold-rolled silicon steel equipment with temperature as a main control parameter and a control method.
Background
High magnetic induction cold rolled silicon steel belongs to a product with high added value and is a key material for manufacturing large-scale energy-saving motors and transformers. In the process of rolling the high-magnetic induction cold rolled silicon steel, the rolling coiling temperature is a very important parameter, and the rolling coiling temperature has direct influence on the quality of the silicon steel. However, in the current production of high magnetic induction cold-rolled silicon steel, the control of the thickness and the plate shape of the silicon steel is emphasized, namely the size specification and the appearance of the silicon steel are emphasized greatly, the coiling temperature parameter in the rolling process is not emphasized sufficiently, and a means and a method for controlling the coiling temperature are not provided, so that the magnetic induction performance of the silicon steel cannot meet the expected target although the thickness and the plate shape of the silicon steel meet the requirements, and the energy-saving effect of a motor and a transformer manufactured by applying the silicon steel is reduced.
At present, in the production of high-magnetic induction cold rolled silicon steel, the control of the thickness and the plate shape of the silicon steel is emphasized, the coiling temperature parameter in the rolling process is not emphasized enough, and no means or method for controlling the coiling temperature exists, so that the magnetic induction performance of the silicon steel cannot meet the expected target, and the energy-saving effect of a motor and a transformer manufactured by applying the silicon steel is reduced.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides high-magnetic-induction cold-rolling silicon steel equipment and a control method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the high-magnetic induction cold rolling silicon steel equipment comprises a roller machine, wherein the roller machine is a 20-roller system roller machine, and the roller machine is a reversible roller machine and can perform multi-pass rolling back and forth. A first coiling machine is arranged on one side of a roller machine, a second coiling machine is arranged on the other side of the roller machine, a first supporting roller, a first coiling thermometer and a first thickness gauge are sequentially arranged between the first coiling machine and the roller machine, a second supporting roller, a second coiling thermometer and a second thickness gauge are sequentially arranged between the second coiling machine and the roller machine, an emulsion pipeline is connected to the roller machine, a pressure gauge, a flow meter and an adjusting valve are arranged on the emulsion pipeline, a pressing cylinder and a detector are arranged at the top of the roller machine, a rolling motor, a frequency converter and a velocimeter are arranged at the bottom of the roller machine, a main shaft of the rolling motor is connected with the roller machine, a silicon steel plate sequentially bypasses the first coiling machine, enters the roller machine after passing through the first supporting roller machine, and a silicon steel plate separated from the roller machine sequentially bypasses the second supporting roller machine and the second coiling machine.
And the coiling thermometer and the thickness gauge are arranged above the silicon steel plate and are used for measuring the temperature and the thickness of the silicon steel plate in the silicon steel rolling process. The pressing oil cylinder directly acts on the roll system of the 20-roll mill to extrude and roll the silicon steel plate, and the rolling force detector is arranged at the pressing oil cylinder to detect the size of the rolling force. The rolling motor drives the silicon steel plate to move forwards rapidly through the main shaft, the frequency converter controls the speed of the rolling motor, and the main shaft is provided with a speedometer for measuring the speed of the rolling motor. And the emulsion in the emulsion pipeline is sprayed onto the silicon steel plate through the central position of a roll system of a 20-roll mill for cooling and lubricating. The emulsion pipeline is provided with a pressure gauge and a flowmeter so as to measure the pressure and the flow of the emulsion in the pipeline, and the emulsion pipeline is provided with a regulating valve for regulating the flow of the emulsion.
Preferably, the first coiling thermometer, the first thickness gauge, the second coiling thermometer and the second thickness gauge are all arranged above the silicon steel plate.
The control method of the high-magnetic-induction cold-rolled silicon steel comprises the following specific steps:
the method comprises the steps that firstly, coiling temperature measured by a coiling thermometer, emulsion flow measured by a flowmeter, emulsion pressure measured by a pressure gauge, rolling mill main shaft speed measured by a velometer, rolling force measured by a detector, steel plate thickness measured by a thickness gauge and a time label are input into a parameter processing module together, and the parameter processing module carries out filtering and correction on the coiling temperature, the emulsion flow, the emulsion pressure, the rolling mill main shaft speed, the rolling force and the steel plate thickness.
And outputting the filtered and corrected coiling temperature, emulsion flow, emulsion pressure, rolling mill spindle speed, rolling force and steel plate thickness to an identification module, and identifying a temperature and emulsion flow relation model, a temperature and rolling mill spindle speed relation model and a temperature and rolling force relation model by the identification module based on a physical change mechanism and a roller deformation mechanism in the silicon steel plate rolling process.
Third, since the thermometer cannot be attached to the rolling position (rolling point) of the rolling mill with respect to the steel sheet, the measured coiling temperature is delayed, and therefore the coiling temperature must be handled. The coiling temperature prediction module is used for processing the coiling temperature. The coiling temperature is input to a coiling temperature prediction module, and the coiling temperature prediction module performs prediction according to the currently collected coiling temperature and the historical coiling temperature so as to obtain the real coiling temperature, namely the predicted coiling temperature.
And fourthly, inputting the temperature and emulsion flow relation model and the predicted coiling temperature into a temperature and emulsion flow relation model correction module together, transmitting the corrected temperature and emulsion flow parameters to an emulsion flow control module, calculating a control algorithm by the emulsion flow control module according to an emulsion flow set value, outputting an emulsion flow control quantity, and adjusting the opening of an adjusting valve so as to adjust the flow of the emulsion.
The temperature and rolling mill spindle speed relation model and the predicted coiling temperature are jointly input into a temperature and rolling mill spindle speed relation model correction module, corrected temperature and rolling mill spindle speed parameters are transmitted to a rolling mill spindle speed control module, the rolling mill spindle speed control module carries out control algorithm calculation according to rolling mill spindle speed, rolling mill spindle speed control quantity is output, output of a rolling mill spindle frequency converter is controlled, and then the spindle frequency converter controls the speed of a rolling motor, namely the moving speed of the silicon steel plate is controlled.
The temperature and rolling force relation model and the predicted coiling temperature are jointly input into a temperature and rolling force relation model correction module, corrected temperature and rolling force parameters are transmitted to a rolling force control module, the rolling force control module performs control algorithm calculation according to a rolling force set value, stopping force control force is output, output rolling force of a lower pressure oil cylinder is controlled, and the silicon steel plate is subjected to extrusion rolling.
In this way, after the relation model of the temperature and the emulsion flow, the relation model of the temperature and the rolling mill main shaft speed and the relation model of the temperature and the rolling force are respectively corrected according to the predicted coiling temperature, the emulsion flow, the moving speed of the silicon steel plate and the rolling force output by the pressing oil cylinder are controlled and adjusted, so that the high-magnetic-induction cold-rolling silicon steel process control based on the temperature as a main control parameter is realized, and the high-magnetic-induction performance of the silicon steel is ensured while the thickness and the plate type of the silicon steel are ensured to meet the requirements.
Compared with the prior art, the invention has the following specific beneficial effects: the invention takes the temperature as a main control parameter, and respectively corrects a temperature and emulsion flow relation model, a temperature and rolling mill main shaft speed relation model and a temperature and rolling force relation model according to the predicted coiling temperature to control and adjust the emulsion flow, the moving speed of the silicon steel plate and the rolling force output by the pressing oil cylinder, thereby realizing the high-magnetic induction cold rolling silicon steel process control based on the temperature as the main control parameter, and ensuring the high-magnetic induction performance of the silicon steel while ensuring the thickness and the plate type of the silicon steel to meet the requirements.
Drawings
FIG. 1 is a layout of the apparatus of the present invention.
FIG. 2 is a block diagram of a process control module of the present invention.
In the figure, 1 is a rolling mill, 2 is a first coiler, 3 is a second coiler, 4 is a first support roll, 5 is a first coiling thermometer, 6 is a first thickness gauge, 7 is a second support roll, 8 is a second coiling thermometer, 9 is a second thickness gauge, 10 is an emulsion pipeline, 11 is a press machine, 12 is a flow meter, 13 is a regulating valve, 14 is a silicon steel plate, 15 is a pressing oil cylinder, 16 is a detector, 17 is a rolling motor, 18 is a frequency converter, and 19 is a speed gauge.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the high magnetic induction cold rolling silicon steel apparatus includes a rolling mill 1, the rolling mill 1 is a 20-roll system rolling mill 1, and the rolling mill 1 is a reversible rolling mill and can perform multi-pass rolling back and forth. A first coiling machine 2 is arranged on one side of a rolling machine 1, a second coiling machine 3 is arranged on the other side of the rolling machine 1, a first supporting roller 4, a first coiling thermometer 5 and a first thickness gauge 6 are sequentially arranged between the first coiling machine 2 and the rolling machine 1, a second supporting roller 7, a second coiling thermometer 8 and a second thickness gauge 9 are sequentially arranged between the second coiling machine 3 and the rolling machine 1, an emulsion pipeline 10 is connected to the rolling machine 1, a pressure gauge, a flow meter 12 and an adjusting valve 13 are arranged on the emulsion pipeline 10, a lower pressure oil cylinder 15 and a detector 16 are arranged at the top of the rolling machine 1, a rolling motor 17, a frequency converter 18 and a speed gauge 19 are arranged at the bottom of the rolling machine 1, a main shaft of the rolling motor 17 is connected with the rolling machine 1, a silicon steel plate 14 sequentially bypasses the first coiling machine 2 and the first supporting roller 4 and then enters the rolling machine 1, a steel plate 14 separated from the rolling machine 1 sequentially bypasses the second supporting roller 7, A second coiler 3.
And the coiling thermometer and the thickness gauge are arranged above the silicon steel plate 14 and are used for measuring the temperature and the thickness of the silicon steel plate 14 in the silicon steel rolling process. The pressing oil cylinder 15 directly acts on the roll system of the 20-roll mill to extrude and roll the silicon steel plate 14, and the rolling force detector 16 is arranged at the pressing oil cylinder 15 to detect the size of the rolling force. The rolling motor 17 drives the silicon steel plate 14 to move forward rapidly through the main shaft, the frequency converter 18 controls the speed of the rolling motor 17, and the main shaft is provided with a velometer 19 for measuring the speed of the rolling motor 17. The emulsion in the emulsion pipeline 10 is sprayed onto the silicon steel plate 14 through the central position of a roll system of a 20-roll mill for cooling and lubricating. A pressure gauge and a flow meter 12 are provided on the emulsion pipe 10 to measure the pressure and flow rate of the emulsion in the pipe, and a regulating valve 13 is provided on the emulsion pipe 10 to regulate the flow rate of the emulsion.
The first coiling thermometer 5, the first thickness gauge 6, the second coiling thermometer 8 and the second thickness gauge 9 are all arranged above the silicon steel plate 14.
As shown in fig. 2, the control method of the high magnetic induction cold rolled silicon steel specifically comprises the following steps:
if the coiling temperature measured by a coiling thermometer is 200 ℃, the emulsion flow measured by a flowmeter 12 on an emulsion pipeline 10 is 3000 liters/minute, the emulsion pressure measured by a pressure gauge on the emulsion pipeline 10 is 0.6MPa, the speed of a main shaft of a rolling mill measured by a speedometer 19 on the main shaft is 300 meters/minute, the rolling force measured by a rolling force detector 16 at a lower oil cylinder 15 is 800 tons, the thickness of a steel plate measured by a thickness gauge is 6mm and a time label marking the acquisition time of the parameters are input into a parameter processing module together, and the parameter processing module carries out smooth filtering, necessary correction and other preprocessing on important parameters such as the coiling temperature, the emulsion flow, the emulsion pressure, the speed of the main shaft of the rolling mill, the rolling force, the thickness of the steel plate and the like.
The parameter processing module outputs the processed important parameters such as coiling temperature, emulsion flow, emulsion pressure, rolling mill main shaft speed, rolling force, steel plate thickness and the like to the identification module, and the identification module respectively identifies a temperature and emulsion flow relation model, a temperature and rolling mill main shaft speed relation model and a temperature and rolling force relation model according to the important parameters such as coiling temperature, emulsion flow, emulsion pressure, rolling mill main shaft speed, rolling force, steel plate thickness and the like and on the basis of a physical change mechanism and a roller deformation mechanism in the rolling process of the silicon steel plate 14.
Since the thermometer cannot be installed at a rolling position (rolling point) of the rolling mill for the silicon steel sheet 14, the measured coiling temperature has a lag, and the coiling temperature must be handled. The coiling temperature prediction module is used for processing the coiling temperature. The coiling temperature is input to a coiling temperature prediction module, and the coiling temperature prediction module predicts according to the currently acquired coiling temperature and the historical coiling temperature, so that the real coiling temperature is 202.3 ℃, namely the predicted coiling temperature is 202.3 ℃.
The temperature and emulsion flow relation model output by the identification module and the predicted coiling temperature 202.3 ℃ output by the coiling temperature prediction module are input to the temperature and emulsion flow relation model correction module together. And the temperature and emulsion flow relation model correction module corrects the temperature and emulsion flow relation model according to the predicted coiling temperature of 202.3 ℃, and outputs the current emulsion flow set value to the emulsion flow control module. The emulsion flow control module carries out control algorithm calculation according to the emulsion flow set value, outputs emulsion flow control quantity and adjusts the opening of the emulsion flow adjusting valve 13, so that the emulsion flow is increased by 3.6%.
Meanwhile, the model of the relationship between the temperature output by the identification module and the speed of the main shaft of the rolling mill and the predicted coiling temperature output by the coiling temperature prediction module are input to the model correction module of the relationship between the temperature and the speed of the main shaft of the rolling mill together with the predicted coiling temperature of 202.3 ℃. And the temperature and rolling mill spindle speed relation model correction module corrects the temperature and rolling mill spindle speed relation model according to the predicted coiling temperature of 202.3 ℃, and outputs the current rolling mill spindle speed set value to the rolling mill spindle speed control module. The rolling mill spindle speed control module carries out control algorithm calculation according to a rolling mill spindle speed set value, outputs rolling mill spindle speed control quantity, controls the output of a rolling mill spindle frequency converter 18, and controls the speed of a rolling motor 17 through the spindle frequency converter 18, namely the forward moving speed of the silicon steel plate 14 is reduced by 2.8%.
Meanwhile, the temperature and rolling force relation model output by the identification module and the predicted coiling temperature 202.3 ℃ output by the coiling temperature prediction module are input to the temperature and rolling force relation model correction module. And the temperature and rolling force relation model correction module corrects the temperature and rolling force relation model according to the predicted coiling temperature of 202.3 ℃, and outputs the current rolling force set value of the rolling mill to the rolling force control module. The rolling force control module of the rolling mill performs control algorithm calculation according to a rolling force set value, outputs rolling force control quantity to control the lower pressure oil cylinder 15, and then outputs rolling force through the lower pressure oil cylinder 15 to extrude and roll the silicon steel plate 14, wherein the rolling force is increased by 0.78%.
In this way, after correcting the relation model of the temperature and the emulsion flow, the relation model of the temperature and the rolling mill main shaft speed and the relation model of the temperature and the rolling force respectively according to the predicted coiling temperature of 202.3 ℃, the control and the regulation of the emulsion flow, the moving speed of the silicon steel plate 14 and the rolling force output by the pressing oil cylinder 15 are carried out, so that the high-magnetic-induction cold-rolling silicon steel process control based on the temperature as a main control parameter is realized, and the high-magnetic-induction performance of the silicon steel is ensured while the thickness and the plate type of the silicon steel are ensured to meet the requirements.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included therein.
Claims (3)
1. The control method is characterized in that the cold-rolled silicon steel equipment comprises a roller mill, wherein a coiling machine, a supporting roller, a coiling thermometer and a thickness gauge are sequentially arranged on two sides of the roller mill, an emulsion pipeline is connected to the roller mill, a pressure gauge, a flow meter and an adjusting valve are arranged on the emulsion pipeline, a pressing oil cylinder and a detector are arranged at the top of the roller mill, a rolling motor, a frequency converter and a velocimeter are arranged at the bottom of the roller mill, a main shaft of the rolling motor is connected with the roller mill, a silicon steel plate sequentially bypasses the coiling machine and the supporting roller on one side and then enters the roller mill, and a silicon steel plate separated from the roller mill sequentially bypasses the supporting roller and the coiling machine on the other side;
the specific control method comprises the following steps:
firstly, coiling temperature measured by a coiling thermometer, emulsion flow measured by a flowmeter, emulsion pressure measured by a pressure gauge, rolling mill main shaft speed measured by a velometer, rolling force measured by a detector, steel plate thickness measured by a thickness gauge and a time label are input into a parameter processing module together, and the parameter processing module carries out filtering and correction on the coiling temperature, the emulsion flow, the emulsion pressure, the rolling mill main shaft speed, the rolling force and the steel plate thickness;
outputting the filtered and corrected coiling temperature, emulsion flow, emulsion pressure, rolling mill spindle speed, rolling force and steel plate thickness to an identification module, and identifying a temperature and emulsion flow relation model, a temperature and rolling mill spindle speed relation model and a temperature and rolling force relation model by the identification module based on a physical change mechanism and a roller deformation mechanism in the silicon steel plate rolling process;
inputting the coiling temperature to a coiling temperature prediction module, and obtaining the predicted coiling temperature by the coiling temperature prediction module according to the collected coiling temperature and the historical coiling temperature;
inputting the temperature and emulsion flow relation model and the predicted coiling temperature into a temperature and emulsion flow relation model correction module together, transmitting the corrected temperature and emulsion flow parameters to an emulsion flow control module, calculating a control algorithm by the emulsion flow control module according to an emulsion flow set value, outputting an emulsion flow control quantity, and adjusting the opening of an adjusting valve to adjust the flow of the emulsion;
the temperature and rolling mill spindle speed relation model and the predicted coiling temperature are jointly input into a temperature and rolling mill spindle speed relation model correction module, corrected temperature and rolling mill spindle speed parameters are transmitted to a rolling mill spindle speed control module, the rolling mill spindle speed control module carries out control algorithm calculation according to the rolling mill spindle speed, the rolling mill spindle speed control quantity is output, the output of a rolling mill spindle frequency converter is controlled, and then the spindle frequency converter controls the speed of a rolling motor, namely the moving speed of the silicon steel plate is controlled;
the temperature and rolling force relation model and the predicted coiling temperature are jointly input into a temperature and rolling force relation model correction module, corrected temperature and rolling force parameters are transmitted to a rolling force control module, the rolling force control module carries out control algorithm calculation according to a rolling force set value, outputs rolling force control quantity, controls the output rolling force of a lower pressure oil cylinder, and carries out extrusion rolling on the silicon steel plate.
2. The method for controlling high magnetic induction cold rolled silicon steel as claimed in claim 1, wherein the coiling thermometer and the thickness gauge disposed on the same side are disposed above the silicon steel plate.
3. The method for controlling high magnetic induction cold rolled silicon steel as claimed in claim 2, wherein the rolling mill is a 20-roll system rolling mill.
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| JPS61199510A (en) * | 1985-02-28 | 1986-09-04 | Nippon Steel Corp | Control method of winding temperature of hot rolled steel strip |
| US6755923B2 (en) * | 2001-12-27 | 2004-06-29 | Alcan International Limited | Method of controlling metal strip temperature |
| JP4701742B2 (en) * | 2005-02-21 | 2011-06-15 | Ｊｆｅスチール株式会社 | Metal strip shape prediction method, shape determination method based on predicted shape, and shape correction method |
| CN101817016B (en) * | 2010-02-09 | 2013-03-27 | 唐山一重机械制造有限公司 | Reversible cold-rolling equipment and production method thereof |
| CN202162205U (en) * | 2011-05-11 | 2012-03-14 | 北京科技大学 | Rolling device for producing magnesium alloy thin plate roll with high toughness and excellent formability |
| CN103418612B (en) * | 2013-08-27 | 2015-05-06 | 大连职业技术学院 | Six-roller reversible cold-rolling production technology of common carbon steel sheet |
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