CN112264463B - Sectional type high-speed steel flat wire hot rolling production line and wire feeding speed control method thereof - Google Patents
Sectional type high-speed steel flat wire hot rolling production line and wire feeding speed control method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
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Abstract
The invention discloses a sectional type high-speed steel flat wire hot rolling production line, which belongs to the field of high-speed steel wire drawing production equipment and comprises an unreeling device for unreeling materials, a pre-straightening device for pre-straightening the materials, wherein the materials are pre-straightened and then respectively pass through a rough rolling device 3, a finish rolling device and a fine rolling device, the hot rolling production line also comprises a detection system, the detection system is used for detecting the rough rolling device 3, the finish rolling device and the fine rolling device, and temperature sensors for detecting the temperature value of the high-speed steel flat wire and laser sensors for detecting the width value and the thickness of the high-speed steel flat wire are respectively arranged at an inlet and an outlet. The invention discloses a wire feeding control method of a high-speed steel flat wire based on the sectional type high-speed steel flat wire hot rolling production line, which comprises three steps of initial parameter setting, hot rolling state monitoring and wire feeding speed calculation.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a high-speed steel flat wire hot rolling production line, in particular to a sectional type high-speed steel flat wire hot rolling production line and a wire feeding speed control method thereof.
[ background ] A method for producing a semiconductor device
The width of the high-speed steel flat wire (also called high-speed steel flat wire belt, high-speed steel flat steel belt, etc.) is usually between 5 and 25 mm, and the thickness is usually between 1 and 5 mm. The high-speed flat steel wire can be further cut into particles with the length of 10-50 mm, and the particles can be used as raw materials of key parts in multiple fields of multiple industries, such as steering blades in pump bodies of oil pressure pumps, hydraulic pumps, booster pumps and the like, as materials of cutters and cutting tools in woodworking industries and sewing industries, as air guide blades of centralized air conditioners, fresh air systems and fan coil pipes and the like.
The high-speed steel flat wire is obtained by longitudinally cutting a high-speed steel wide steel band, namely, a shearing machine applies huge impact force to longitudinally cut the high-speed steel wide steel band from top to bottom. The method has the advantage of small processing difficulty, and is a common method in the industry, but the method has the defect that transverse tension in the cutting feed process is easy to cause bending and kinking phenomena, so that the material is wasted.
Aiming at the phenomenon, the novel high-speed steel flat wire processing method is gradually and directly rolled abroad, namely, the high-speed steel round wire is directly processed into the high-speed steel flat wire through the matched rolling among various machines such as unreeling and rolling, hot charging and hot delivery, a vertical rod rolling mill and the like.
However, due to the particularity of the high-speed steel material, especially the lack of tensile strength of the high-speed steel material, the direct rolling method is only mastered by a few foreign companies, and although many domestic companies move equipment of foreign production lines, the production process cannot be mastered, especially the control method of wire feeding speed during hot rolling is not mastered: when the wire-moving speed is too slow, the quality of the flat wire can be improved, but the cost of the product is far higher than that of the similar foreign products; when the wire-moving speed is too high, the phenomenon of breaking as soon as pulling often occurs. In summary, the rolling of high-speed steel flat wires requires not only complete equipment but also a process and a control method.
[ summary of the invention ]
In order to solve the problems in the background art, the invention provides a segmented high-speed steel flat wire hot rolling production line and a wire feeding speed control method thereof, which realize continuous, stable and economic hot rolling of high-speed steel flat wires.
The technical scheme adopted by the invention is as follows:
the utility model provides a sectional type high-speed steel flat filament hot rolling production line, is including unreeling the unwinding device of usefulness, the precorrection device of precorrection usefulness, and the high-speed steel is through rough rolling device, finish rolling device, fine rolling device respectively after the precorrection, hot rolling production line still includes detecting system, detecting system is used for detecting the three rolling device of rough rolling device, finish rolling device, fine rolling device are equipped with the temperature sensor who is used for detecting the high-speed steel flat filament temperature value separately in entrance and exit to and be used for detecting the laser sensor of high-speed steel flat filament width value and thickness.
The invention has the following beneficial effects:
in the invention, the high-speed steel flat wire is rolled in a sectional mode, and the high-speed steel flat wire is specifically divided into a rough rolling device, a finish rolling device and a fine rolling device, so that the gradual stage rolling can be realized, the rolling from the high-speed steel round material to the high-speed steel flat wire can be gradually completed, and the produced high-speed steel flat wire has the advantages of high tensile strength, consistent section size, small size tolerance range and the like.
The invention also discloses a method for detecting the width and thickness of the high-speed steel flat wire, which is characterized in that a detection system is arranged, the detection system is mainly used for detecting the temperature values of a rough rolling device, a finish rolling device and a fine rolling device at an inlet and an outlet respectively, and detecting the width and thickness of the high-speed steel flat wire at the inlet and the outlet simultaneously, and the detected values can be used for reasonably adjusting the wire traveling speed of the whole production line, so that the wire traveling speed is reasonable, the cost can be prevented from being increased due to too slow wire traveling speed, the quality is prevented from being influenced even the flat wire is broken due to too fast speed, and the probability that the high-speed steel flat wire is broken in the rolling process is reduced.
Preferably, the rough rolling device, the finish rolling device and the fine rolling device each comprise an induction heating furnace and a multi-roller mill train.
Preferably, the detection system comprises nine temperature sensors, wherein the first infrared temperature sensor and the second infrared temperature sensor are respectively arranged at an inlet and an outlet of an induction heating furnace of the rough rolling device, the fourth infrared temperature sensor and the fifth infrared temperature sensor are respectively arranged at an inlet and an outlet of an induction heating furnace of the finish rolling device, the seventh infrared temperature sensor and the eighth infrared temperature sensor are respectively arranged at an inlet and an outlet of an induction heating furnace of the finish rolling device, and the third infrared temperature sensor, the sixth infrared temperature sensor and the ninth infrared temperature sensor are respectively arranged at an outlet of a multi-roll mill set of the rough rolling device, the finish rolling device and the finish rolling device.
Preferably, the detection system comprises six laser sensors, wherein the first and second laser sensor groups are respectively arranged at the inlet and the outlet of the multi-roll mill train of the rough rolling device, the third and fourth laser sensor groups are respectively arranged at the inlet and the outlet of the multi-roll mill train of the finish rolling device, and the fifth and sixth laser sensor groups are respectively arranged at the inlet and the outlet of the multi-roll mill train of the fine rolling device.
Preferably, the multi-roller mill set in the rough rolling device, the finish rolling device and the fine rolling device is a four-roller mill set; and/or the pre-straightening device is a multi-roller mill, and the number of the roller shafts is 6 to 9.
In addition, the invention also discloses a wire feeding speed control method of the sectional type high-speed steel flat wire hot rolling production line, which adopts the sectional type high-speed steel flat wire hot rolling production line in any one of the schemes, and the wire feeding speed control method comprises the following steps: setting initial parameters, monitoring hot rolling state and calculating wire moving speed.
Preferably, the initial parameter setting is to determine the initial wire travelling speed of the whole production line through table lookup according to the grade of the high-speed steel, and to distribute the initial elongation rate set values of the rough rolling device, the finish rolling device and the fine rolling device.
Preferably, the hot rolling state monitoring is carried out by detecting six temperature values at the inlet and the outlet of an induction heating furnace of the rough rolling device, the finish rolling device and the fine rolling device, three temperature values at the outlet of a multi-roll mill set of the rough rolling device, the finish rolling device and the fine rolling device, and six width values and thickness values at the inlet and the outlet of the multi-roll mill set of the rough rolling device, the finish rolling device and the fine rolling device.
Preferably, the wire-moving speed calculation includes calculating the maximum allowable wire-moving speed of the rough rolling device, the maximum allowable wire-moving speed of the finish rolling device and the maximum allowable wire-moving speed of the fine rolling device, selecting the minimum value of the three maximum allowable wire-moving speeds as the preliminarily calculated wire-moving speed,
calculating the maximum allowable speed of the rough rolling device:
in the above formula, V1 represents the maximum allowable travel of the roughing apparatusThe wire speed, minf (x) represents the minimum value of x satisfying the conditions of h (x) and t (x), x D Representing the theoretical maximum allowable speed of the wire,
h (x) represents the relationship among the wire moving speed, the heating power and the total heating quantity, and the calculation formula is as follows:
in the above formula, a represents the heating coefficient, d represents the thickness of the high-speed flat steel wire, B represents the thickness of the induction heating furnace, and H represents the maximum heating power of the induction heating furnace;
t (x) represents the relationship between the wire moving speed and the temperature rise of the high-speed flat steel wire, and the calculation formula is as follows;
in the formula, c is specific heat capacity, T0 is temperature before heating, l and d are cross section width and cross section thickness of the high-speed steel flat wire respectively, p represents density of the high-speed steel flat wire, and T is the lowest temperature value capable of being hot rolled;
calculation of the maximum allowable speed of the finish rolling device:
in the above formula, V2 represents the maximum allowable wire feeding speed of the finish rolling device; Δ H 1 Represents the heat dissipation amount in the rough rolling stage; t1 and T2 indicate the lower and upper limits of the temperature at which hot rolling performance is best;
calculating the maximum allowable speed of the fine rolling device:
in the above formula, V3 represents the maximum allowable wire-feeding speed of the fine rolling device; Δ H 2 Representing the heat dissipation amount in the finish rolling stage; tables T1 and T2The lower and upper temperature limits for the best hot rolling performance;
calculating the wire moving speed of the production line: v ═ min (V1, V2, V3); in the above formula, V represents the wire running speed of the whole production line.
Preferably, the method further comprises a wire feeding speed optimization step of calculating the difference between the actual elongation and the set elongation of each of the rough rolling step, the finish rolling step and the finish rolling step, and for the step with the smallest difference in elongation, decreasing the set elongation step by step according to a preset value to increase the difference between the actual elongation and the set elongation, and for the step with the largest difference in elongation, increasing the set elongation step by step according to a preset value to decrease the difference between the actual elongation and the set elongation, and repeating the steps to make the difference between the actual elongation and the set elongation of the rough rolling step, the finish rolling step and the finish rolling step consistent, wherein the calculation formula of the actual elongation is as follows:
in the above formula, /) 1 ，d 1 Respectively showing the cross-sectional width and the cross-sectional thickness l of the high-speed steel flat wire after rolling 2 ，d 2 Respectively showing the cross section width, the cross section thickness and the length of the high-speed steel flat wire before rolling.
Other technical effects of the present invention will be described in detail in the following embodiments.
[ description of the drawings ]
FIG. 1 is a schematic diagram of the placement of sensors within a pipeline according to the present invention.
FIG. 2 is a flow chart of a method for controlling the wire feeding speed of the production line.
In the figure: 1. the device comprises an unwinding device, 2, a pre-straightening device, 3, a rough rolling device, 3A, an induction heating furnace of the rough rolling device, 3B, a four-roller mill set of the rough rolling device, 4, a finish rolling device, 4A, an induction heating furnace of the finish rolling device, 4B, a four-roller mill set of the finish rolling device, 5, a fine rolling device, 5A, an induction heating furnace of the fine rolling device, 5B, a four-roller mill set of the fine rolling device, 6 and a winding device.
[ detailed description ] embodiments
The invention is further described below with reference to the following figures and examples.
As shown in fig. 1, the sectional type high-speed steel flat wire continuous rolling production line provided by the invention sequentially comprises an unwinding device 1, a pre-straightening device 2, a rough rolling device 3, a finish rolling device 4, a fine rolling device 5, a winding device 6, and a detection system and a main control system. The invention divides the hot rolling process of the high-speed steel flat wire into three sections of rough rolling, finish rolling and fine rolling. Wherein the high-speed steel flat wire is heated as much as possible in the power range of the rough rolling, and the elongation of the high-speed steel flat wire is further improved as much as possible in the tensile range which can be borne by the high-speed steel flat wire; in finish rolling, the high-speed steel flat wire is deeply heated through accurate temperature control, so that the internal temperature of the high-speed steel flat wire is consistent with the surface temperature, and the elongation rate of the high-speed steel flat wire tends to a target value; and finally, the fine rolling realizes that the dimensions such as width, thickness and the like of the high-speed steel flat wire completely meet the precision requirement through precise temperature control.
In fig. 1, the unwinding device 1 and the winding device 6 may adopt a vertical or horizontal type unwinding/winding machine; the pre-straightening device 2 can be a multi-roll mill (such as a nine-roll mill) commonly used in the market, the pre-straightening process belongs to cold rolling without heating, and the main purpose is to straighten the rolled high-speed steel round wire and preliminarily roll the steel round wire into a flat shape. The rough rolling device 3, the finish rolling device 4 and the fine rolling device 5 respectively comprise an induction heating machine and a multi-roller rolling mill, wherein the induction heating machine adopts non-contact induction heating, the multi-roller rolling mill unit is preferably a four-roller rolling mill, the number of the multi-roller rolling mill unit can be between 1 and 3, and the multi-roller rolling mill unit can be flexibly determined according to the tensile property and the extensibility of the high-speed steel material.
The detection system comprises nine infrared temperature sensors and six laser sensors, wherein the infrared temperature sensors can realize temperature measurement of the high-speed steel flat wire under the non-contact condition, and the laser sensor group comprises two types of laser type width sensors and laser type thickness sensors so as to realize non-contact measurement of width and thickness parameters of the high-speed steel flat wire.
It should be noted that before the high-speed round steel material is loaded into the system, preparation works such as peeling, polishing, drying and the like are preferably required to be done, and a machine for realizing the above process can also be used together with the invention to form a complete equipment. In addition, the invention can also be used together with a high-frequency annealing device, a natural cooling device and the like to realize various processes such as hot rolling, cold rolling and the like of the high-speed steel flat wire.
The schematic diagram of the arrangement positions of nine infrared temperature sensors and six laser sensors in the production line of the invention is also shown in fig. 1. As shown in fig. 1, first and second infrared temperature sensors are respectively disposed at the inlet and outlet of the induction heating furnace 3A of the rough rolling device 3, fourth and fifth infrared temperature sensors are respectively disposed at the inlet and outlet of the induction heating furnace 4A of the finish rolling device 4, and seventh and eighth infrared temperature sensors are respectively disposed at the inlet and outlet of the induction heating furnace 5A of the fine rolling device 5. The arrangement method of the sensors can enable the system to calculate and obtain the functional relation among four parameters of the high-speed steel flat wire running speed, the heating power of the induction heating furnace, the ambient temperature and the temperature rise before and after heating of different grades and different materials, and the relational expression of the function h (x) is obtained. Meanwhile, the calculation of the rough rolling procedure h (x) can also provide a mathematical basis for the calculation of the precise heating temperature control t (x) of the finish rolling procedure and the fine rolling procedure.
As shown in fig. 1, the first and second laser sensors are respectively disposed at the inlet and outlet of the four-high rolling mill train 3B of the rough rolling apparatus 3, the third and fourth laser sensor groups are respectively disposed at the inlet and outlet of the four-high rolling mill train 4B of the finish rolling apparatus 4, and the fifth and sixth laser sensor groups are respectively disposed at the inlet and outlet of the four-high rolling mill train 5B of the finish rolling apparatus 5. According to the sensor arrangement method, the elongation of the high-speed steel flat wire before and after each section of rolling can be calculated (the elongation refers to the rectangular parameter of the section of the flat wire after rolling divided by the rectangular parameter of the section of the flat wire before rolling).
As shown in fig. 1, the third, sixth and ninth infrared temperature sensors are respectively arranged at the outlets of the four-high rolling mill train of the rough rolling device 3, the finish rolling device 4 and the fine rolling device 5, and the relationship among the wire feeding speed of the high-speed steel flat wire, the elongation before and after rolling, the ambient temperature and the heat dissipation amount in the rolling process can be calculated by combining the second, fifth and eighth infrared temperature sensors at the outlets of the induction heating furnaces and the detection parameters of the laser sensor groups, so that a mathematical basis is provided for the accurate temperature control amount Δ H of the next induction heating furnace.
FIG. 2 is a flow chart of the control method of the invention for the wire-moving speed in the rolling process. The invention mainly solves the calculation and optimization selection of the wire-moving speed, because the optimal wire-moving speed of the high-speed steel flat wire is influenced by different grades of high-speed steel (with huge difference of material parameters), different pretreatment processes (with larger difference of rolling performance), different rolling environments (with different requirements on temperature control) and the like. According to the invention, through a self-adaptive automatic wire-moving speed adjusting method, the phenomenon of overhigh cost caused by overhigh wire-moving speed is avoided, and the phenomenon of quality reduction and even breaking caused by overhigh wire-moving speed is also avoided.
As shown in fig. 2, the method for controlling the wire feeding speed provided by the invention comprises the following steps: setting initial parameters, monitoring hot rolling state and calculating wire moving speed.
And the initial parameter setting is to determine the initial wire feeding speed of the whole assembly line through a table look-up table according to the grade of the high-speed steel, and to distribute the initial lowest elongation rate set values of rough rolling, finish rolling and fine rolling. The table is historical experience data and is formed by data accumulation in the manual regulation and control process in the past. It should be noted that even if the high-speed steel grades are the same, the set initial wire-feeding speed is often lower than the wire-feeding speed of the historical experience, for example, the value is 80% of the wire-feeding speed of the historical experience, so that the influence caused by different pretreatment processes, different environmental parameters and the like is avoided, and the high-speed steel flat wire is prevented from being broken once the machine is started. And subsequently, gradually increasing the wire moving speed to a normal level by a wire moving speed self-adaptive adjusting method.
The hot rolling state monitoring is used for subsequent calculation by detecting six temperature parameters before and after rough rolling, finish rolling and fine rolling induction heating, six width and thickness parameters before and after four-roller mills of rough rolling, finish rolling and fine rolling and three temperature parameters after the four-roller mills of rough rolling, finish rolling and fine rolling.
The wire-moving speed calculation comprises the steps of firstly calculating the highest allowable wire-moving speed of the rough rolling device 3, the highest allowable wire-moving speed of the finish rolling device 4 and the highest allowable wire-moving speed of the fine rolling device 5 respectively, and then calculating the wire-moving speed of the assembly line, namely taking the minimum value of the three speeds.
Calculation of the maximum allowable speed of the roughing device 3:
in the above formula, V1 represents the maximum allowable wire-feeding speed of the rough rolling device 3, min f (x) represents the minimum value of x satisfying the conditions of h (x) and t (x), and x D Representing the theoretical maximum allowable speed of the wire,
h (x) represents the relationship among the wire moving speed, the heating power and the total heating quantity, and the calculation formula is as follows:
in the above formula, a represents the heating coefficient, d represents the thickness of the high-speed flat steel wire, B represents the thickness of the induction heating furnace, and H represents the maximum heating power of the induction heating furnace;
t (x) represents the relationship between the wire moving speed and the temperature rise of the high-speed flat steel wire, and the calculation formula is as follows;
in the formula, c is specific heat capacity, T0 is temperature before heating, l and d are cross section width and cross section thickness of the high-speed steel flat wire respectively, p represents density of the high-speed steel flat wire, and T is the lowest temperature value capable of being hot rolled;
in addition, when calculating the wire feeding speed of the rough rolling device 3, it is preferable to consider the actual elongation of the high-speed steel flat wire, and it is preferable that the actual elongation is larger than the minimum elongation C1 required to be completed in the rough rolling step, and the actual elongation is calculated as:
in the above formula, /) 1 ，d 1 Respectively showing the cross-sectional width and the cross-sectional thickness l of the high-speed steel flat wire after rolling 2 ，d 2 Respectively showing the cross section width, the cross section thickness and the length of the high-speed steel flat wire before rolling. Since different wire-moving speeds will influence l 1 ，d 1 ，l 2 ，d 2 Since the numerical value of (2) changes, it is necessary to consider whether or not C (x) ≧ C1 is satisfied in the final calculation of the yarn running speed, and if not, the final value of the yarn running speed is appropriately adjusted, which is an auxiliary selection.
Calculation of the maximum allowable speed of the finishing rolling device 4:
in the above formula, V2 represents the maximum allowable wire feeding speed of the finish rolling apparatus 4; Δ H 1 Represents the heat dissipation amount in the rough rolling stage; t1 and T2 indicate the lower and upper limits of the temperature at which hot rolling performance is best; similarly, in the finish rolling step, V2 is preferably selected so as to satisfy C (x) C2, where C2 is the lowest elongation to be achieved in the finish rolling step.
Calculation of the maximum allowable speed of the fine rolling device 5:
in the above formula, V3 represents the maximum allowable wire-feeding speed of the finish rolling apparatus 5; Δ H 2 Indicating the heat dissipation amount in the finish rolling stage; t1 and T2 indicate the lower and upper limits of the temperature at which hot rolling performance is best; similarly, in the finish rolling step, V3 is preferably selected so as to satisfy the requirement of C (x) C3, where C3 is the lowest elongation to be achieved in the finish rolling step.
According to the above calculation and auxiliary selection, wire traveling speeds in rough rolling, finish rolling and fine rolling are obtained as V1, V2 and V3, and the final wire traveling speed of the whole production line is calculated as V = min (V1, V2 and V3).
In order to further optimize the wire moving speed, the method also comprises the following wire moving speed optimization steps: the differences Δ C between the current actual elongation of the rough rolling, the finish rolling and the set minimum elongation, i.e., Δ C1, Δ C2, Δ C3, are calculated, respectively, according to the function of C (x) above. The step of reducing the set elongation stepwise by a predetermined value to increase the difference between the actual elongation and the set elongation in the step of minimizing the difference in elongation, and the step of increasing the set elongation stepwise by a predetermined value to decrease the difference between the actual elongation and the set elongation in the step of maximizing the difference in elongation is repeated to make the differences Δ C1, Δ C2, and Δ C3, which are the differences between the actual elongation and the set elongation in the rough rolling step, the finish rolling step, and the finish rolling step, coincide.
In conclusion, the invention is suitable for manufacturers of high-speed steel flat wires, and the high-speed steel flat wires such as M2, M3, M4, M42 and the like produced by the manufacturers can be used for replacing high-speed steel flat wire products monopolized by foreign products and high in price at present. The hardware of the invention is simple, and the hardware is ready-made machine equipment which can be directly purchased, thus the invention has better popularization. The foregoing detailed description is intended to illustrate and not limit the invention, which is intended to be within the spirit and scope of the appended claims, and any changes and modifications that fall within the true spirit and scope of the invention are intended to be covered by the following claims.
Claims (6)
1. A wire feeding speed control method of a sectional type high-speed steel flat wire hot rolling production line comprises an unreeling device for unreeling and a pre-straightening device for pre-straightening, high-speed steel passes through a rough rolling device, a finish rolling device and a fine rolling device respectively after being pre-straightened, the hot rolling production line further comprises a detection system, the detection system is used for detecting the rough rolling device, the finish rolling device and the fine rolling device, temperature sensors for detecting the temperature value of the high-speed steel flat wire and laser sensors for detecting the width value and the thickness value of the high-speed steel flat wire are respectively arranged at an inlet and an outlet; the method is characterized by comprising the following steps: setting initial parameters, monitoring a hot rolling state and calculating a wire moving speed; setting the initial parameters, namely determining the initial wire travelling speed of the whole assembly line through table lookup according to the grade of the high-speed steel, and distributing the initial elongation rate set values of the rough rolling device, the finish rolling device and the fine rolling device; the hot rolling state monitoring comprises six temperature values at the inlet and the outlet of an induction heating furnace of the rough rolling device, the finish rolling device and the fine rolling device, three temperature values at the outlet of a multi-roll mill set of the rough rolling device, the finish rolling device and the fine rolling device, and six width values and thickness values at the inlet and the outlet of the multi-roll mill set of the rough rolling device, the finish rolling device and the fine rolling device; the wire-feeding speed calculation comprises the steps of firstly respectively calculating the highest allowable wire-feeding speed of a rough rolling device, the highest allowable wire-feeding speed of a finish rolling device and the highest allowable wire-feeding speed of a fine rolling device, selecting the minimum value of the three highest allowable wire-feeding speeds as the preliminarily calculated wire-feeding speed,
calculating the maximum allowable speed of the rough rolling device:
in the above formula, V1 represents the maximum allowable wire-feeding speed of the rough rolling device, minf (x) represents the minimum value of x satisfying the conditions of h (x) and t (x), and x D Representing the theoretical maximum allowable speed of the wire,
h (x) represents the relationship among the wire moving speed, the heating power and the total heating quantity, and the calculation formula is as follows:
in the above formula, a represents the heating coefficient, d represents the thickness of the high-speed flat steel wire, B represents the thickness of the induction heating furnace, and H represents the maximum heating power of the induction heating furnace;
t (x) represents the relationship between the wire moving speed and the temperature rise of the high-speed flat steel wire, and the calculation formula is as follows;
in the formula, c is specific heat capacity, T0 is temperature before heating, l and d are cross section width and cross section thickness of the high-speed steel flat wire respectively, p represents density of the high-speed steel flat wire, and T is the lowest temperature value capable of being hot rolled;
calculation of the maximum allowable speed of the finish rolling device:
in the above formula, V2 represents the maximum allowable wire feeding speed of the finish rolling device; Δ H 1 Represents the heat dissipation amount in the rough rolling stage; t1 and T2 indicate the lower and upper limits of the temperature at which hot rolling performance is best;
calculating the maximum allowable speed of the fine rolling device:
in the above formula, V3 represents the maximum allowable wire-feeding speed of the fine rolling device; Δ H 2 Representing the heat dissipation amount in the finish rolling stage; t1 and T2 indicate the lower and upper limits of the temperature at which hot rolling performance is best;
calculating the wire moving speed of the production line: v ═ min (V1, V2, V3); in the above formula, V represents the wire running speed of the whole production line.
2. The wire feeding speed control method of the sectional type high-speed steel flat wire hot rolling production line according to claim 1, characterized in that: the method comprises a rough rolling process, a finish rolling process and a fine rolling process, and further comprises a wire running speed optimization step, wherein the wire running speed optimization step comprises the steps of respectively calculating the difference value between the actual elongation rate and the set elongation rate of the rough rolling process, the finish rolling process and the fine rolling process, for the process with the minimum elongation rate difference value, reducing the set elongation rate step by step according to a preset value so as to improve the difference value between the actual elongation rate and the set elongation rate, for the process with the maximum elongation rate difference value, improving the set elongation rate step by step according to the preset value so as to reduce the difference value between the actual elongation rate and the set elongation rate, and repeating the steps so that the difference values between the actual elongation rate and the set elongation rate of the rough rolling process, the finish rolling process and the fine rolling process tend to be consistent, and the calculation formula of the actual elongation rate is as follows:
in the above formula, /) 1 ，d 1 Respectively showing the cross-sectional width and the cross-sectional thickness l of the high-speed steel flat wire after rolling 2 ，d 2 Respectively showing the cross section width, the cross section thickness and the length of the high-speed steel flat wire before rolling.
3. The wire feeding speed control method of the sectional type high-speed steel flat wire hot rolling production line according to claim 1, characterized in that: the device comprises a rough rolling device, a finish rolling device and a fine rolling device, wherein each rolling device comprises an induction heating furnace and a multi-roller mill set.
4. The wire feeding speed control method of the sectional type high-speed steel flat wire hot rolling production line according to claim 3, characterized in that: the detection system comprises nine temperature sensors, wherein a first infrared temperature sensor and a second infrared temperature sensor are respectively arranged at an inlet and an outlet of an induction heating furnace of the rough rolling device, a fourth infrared temperature sensor and a fifth infrared temperature sensor are respectively arranged at an inlet and an outlet of an induction heating furnace of the finish rolling device, a seventh infrared temperature sensor and an eighth infrared temperature sensor are respectively arranged at an inlet and an outlet of an induction heating furnace of the finish rolling device, and a third infrared temperature sensor, a sixth infrared temperature sensor and a ninth infrared temperature sensor are respectively arranged at outlets of a multi-roller rolling unit of the rough rolling device, the finish rolling device and the finish rolling device.
5. The wire feeding speed control method of the sectional type high-speed steel flat wire hot rolling production line according to claim 4, characterized in that: the detection system comprises six laser sensors, wherein a first laser sensor group and a second laser sensor group are respectively arranged at an inlet and an outlet of a multi-roller mill set of the rough rolling device, a third laser sensor group and a fourth laser sensor group are respectively arranged at the inlet and the outlet of the multi-roller mill set of the finish rolling device, and a fifth laser sensor group and a sixth laser sensor group are respectively arranged at the inlet and the outlet of the multi-roller mill set of the fine rolling device.
6. The wire feeding speed control method of the sectional type high-speed steel flat wire hot rolling production line according to claim 3, characterized in that: the multi-roller mill set in the rough rolling device, the finish rolling device and the fine rolling device is a four-roller mill set; and/or the pre-straightening device is a multi-roller mill, and the number of the roller shafts is 6 to 9.
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