CN116060454B - Cold continuous rolling temperature control method for electrical steel - Google Patents
Cold continuous rolling temperature control method for electrical steel Download PDFInfo
- Publication number
- CN116060454B CN116060454B CN202310288639.3A CN202310288639A CN116060454B CN 116060454 B CN116060454 B CN 116060454B CN 202310288639 A CN202310288639 A CN 202310288639A CN 116060454 B CN116060454 B CN 116060454B
- Authority
- CN
- China
- Prior art keywords
- continuous rolling
- electrical steel
- temperature
- frame
- emulsion flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 171
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000005097 cold rolling Methods 0.000 claims abstract description 19
- 239000000839 emulsion Substances 0.000 claims description 98
- 238000001816 cooling Methods 0.000 claims description 65
- 230000001050 lubricating effect Effects 0.000 claims description 33
- 230000009467 reduction Effects 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 description 22
- 238000005507 spraying Methods 0.000 description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 230000017525 heat dissipation Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a cold continuous rolling temperature control method for electrical steel, which comprises the following steps: controlling the temperature of the electrical steel before reaching the continuous rolling unit to be 100-380 ℃; controlling the temperature of the electrical steel reaching the outlet of the 1 st frame to the i th frame of the continuous rolling unit to rise sequentially; controlling the temperature of the electrical steel reaching the (i+1) th frame to the (n) th frame of the continuous rolling unit to be reduced in sequence; wherein the temperature of the electrical steel reaching the outlet of the (i+1) th frame is lower than that of the outlet of the (i) th frame, n is the number of frames of the tandem rolling unit, and n is more than or equal to 5,i and less than or equal to n-2. The invention ensures the stability of the electrical steel in the cold continuous rolling process through the heating before the strip steel enters the cold rolling unit and the temperature control of the front section of the cold rolling frame.
Description
Technical Field
The invention belongs to the technical field of cold rolling of electrical steel, and particularly relates to a cold continuous rolling temperature control method of electrical steel.
Background
The electrical steel is a ferrosilicon alloy, also called oriented silicon steel, and can be used for manufacturing electric devices such as iron cores of transformers. The higher the silicon content of the oriented silicon steel is, the better the electromagnetic performance is, but the plasticity is obviously reduced, the brittleness is increased, and the rolling processability is obviously reduced.
At present, in order to solve the problem of easy breakage caused by high brittleness of oriented silicon steel, most of cold rolling is performed by adopting a reversible rolling mill, and ageing treatment can be performed between two passes so as to improve the processing performance of the oriented silicon steel, but the production efficiency can be reduced by adopting the reversible rolling mill for rolling, and the production efficiency can be improved by adopting cold continuous rolling for rolling electrical steel, but the breakage is easy to occur and the stability is poor.
Disclosure of Invention
In order to solve the technical problems, the invention provides the cold continuous rolling temperature control method for the electrical steel, which reduces the risk of breakage of the electrical steel in the cold continuous rolling process and improves the rolling stability.
The technical scheme of the invention is as follows: the cold continuous rolling temperature control method of the electrical steel comprises the following steps:
controlling the temperature of the electrical steel before reaching the continuous rolling unit to be 100-380 ℃;
controlling the temperature of the electrical steel reaching the outlet of the 1 st frame to the i th frame of the continuous rolling unit to rise sequentially;
controlling the temperature of the electrical steel reaching the (i+1) th frame to the (n) th frame of the continuous rolling unit to be reduced in sequence;
wherein the temperature of the electric steel reaching the outlet of the (i+1) th frame is lower than that of the outlet of the (i) th frame, n is the number of frames of the continuous rolling unit, and n is more than or equal to 5,i and less than or equal to n-2.
In some embodiments, the temperature of the control electrical steel before reaching the continuous rolling mill train is 100-380 ℃, and the control electrical steel specifically comprises:
obtaining the cold continuous rolling speed V of the electrical steel;
when the cold continuous rolling speed V is smaller than b, controlling the heating temperature T of the electrical steel before reaching a continuous rolling unit 1 130-380 ℃; when the cold continuous rolling speed V is more than or equal to b, controlling the electrical steel to reach continuous rollingHeating temperature T before the rolling mill set 2 At 100-300 ℃, b is 150-350 mpm and T 1 ＞T 2 。
In some embodiments, the mass fraction of Si, T1 and T2 in the electrical steel satisfy the following relationship:
when the mass fraction of Si is 3-3.5%, the temperature of T1 is 130-230 ℃, and the temperature of T2 is 100-150 ℃;
when the mass fraction of Si is 3.5 percent and less than or equal to 5 percent, the temperature of T1 is 180-380 ℃, and the temperature of T2 is 150-300 ℃.
In some embodiments, the difference between T1 and T2 is 30-80 ℃.
In some embodiments, the cold continuous rolling temperature control method further comprises: and controlling the temperature of the electrical steel reaching the outlet of the 1 st frame to be 120-200 ℃, and controlling the temperature of the electrical steel reaching the outlet of the i-th frame to be 200-350 ℃.
In some embodiments, the lubricating emulsion flow Q1 entering the roll gap from the 1 st rack to the i th rack and the cooling emulsion flow Q2 of the working roll conform to the following rules:
when the cold continuous rolling speed V is less than V < a, Q1 and Q2 are both 0;
when the cold continuous rolling speed V is a less than or equal to V and less than b, Q1 is the maximum lubricating emulsion flow rate X m allowed by the equipment, the value of m is 15-25%, Q2 is the maximum cooling emulsion flow rate X n allowed by the equipment, and the value of n is 25-35%;
when the cold continuous rolling speed V is b less than or equal to V less than c, Q1 is the maximum lubricating emulsion flow rate x m+x x k1 allowed by the equipment, Q2 = the maximum cooling emulsion flow rate x n+x x k2 allowed by the equipment, x is the speed variation, k1 is the roll gap speed flow coefficient, and k2 is the roll cooling speed flow coefficient;
when the cold continuous rolling speed V is V not less than c, Q1 and Q2 are respectively the maximum lubricating emulsion flow allowed by the equipment and the maximum cooling emulsion flow allowed by the equipment, and a and c are set values.
In some embodiments, the cold rolling reduction of each of the 1 st to i th stands is 25-45%.
In some embodiments, the temperature of the electrical steel reaching the outlet of the (i+1) th rack is 50-100 ℃, and the temperature of the electrical steel reaching the outlet of the (n) th rack is 80-130 ℃.
In some embodiments, the lubricating emulsion flow Q3 from the (i+1) th frame to the (n) th frame entering the roll gap and the cooling emulsion flow Q4 of the working roll meet the following rules:
when the cold continuous rolling speed V is less than V < a, Q3 and Q4 are both 0;
when the cold rolling speed V is a less than or equal to V and less than b, Q3 is the maximum lubricating emulsion flow rate X m allowed by the equipment, the value of m is 15-25%, Q4 is the maximum cooling emulsion flow rate X n allowed by the equipment, and the value of n is 25-35%;
when the cold continuous rolling speed V is V not less than b, Q3 and Q4 are respectively the maximum lubricating emulsion flow allowed by the equipment and the maximum cooling emulsion flow allowed by the equipment.
In some embodiments, the reduction rates of the (i+1) th frame to the (n) th frame are 6-28%.
The beneficial effects of the invention at least comprise:
the invention provides a cold continuous rolling temperature control method of electrical steel, which comprises the following steps: controlling the temperature of the electrical steel before reaching the continuous rolling unit to be 100-380 ℃; controlling the temperature of the electrical steel reaching the outlet of the 1 st frame to the i th frame of the continuous rolling unit to rise sequentially; controlling the temperature of the electrical steel reaching the (i+1) th frame to the (n) th frame of the continuous rolling unit to be reduced in sequence; wherein the temperature of the electrical steel reaching the outlet of the (i+1) th frame is lower than that of the outlet of the (i) th frame, n is the number of frames of the tandem rolling unit, and n is more than or equal to 5,i and less than or equal to n-2. The invention controls the temperature before and during the cold continuous rolling of the electrical steel, heats the electrical steel before the cold continuous rolling, provides a heat basis for the cold continuous rolling, improves the plasticity of the electrical steel, heats and rolls the front-stage frame in the cold continuous rolling, and reduces the breakage risk caused by large brittleness of the grain size after the normalized treatment of the electrical steel; the electrical steel is elongated and refined along with the grain extension under the action of temperature and pressure, the plasticity of the electrical steel in the rear-stage frame is improved, the rolling stability is good, and the rear-stage frame is cooled and rolled at the moment, so that the surface quality of the strip steel can be ensured. Therefore, the stability of the electrical steel in the cold continuous rolling process is ensured through the heating before the strip steel enters the cold rolling unit and the temperature control of the front section and the rear section of the cold rolling frame.
Drawings
Fig. 1 shows a process step diagram of a cold continuous rolling temperature control method for electrical steel according to an embodiment of the application.
Detailed Description
In order to make the technical solution more clearly understood by those skilled in the art, the following detailed description is made with reference to the accompanying drawings.
The embodiment of the invention provides a cold continuous rolling temperature control method for electrical steel, which adopts a cold continuous rolling technology to produce high-magnetic induction oriented silicon steel with magnetic induction strength not lower than 1.88T and high-grade non-oriented silicon steel for new energy automobiles, thereby improving the production efficiency, and ensuring good stability and difficult belt breakage in the rolling process.
Referring to fig. 1, the cold continuous rolling temperature control method for electrical steel provided by the embodiment of the invention includes the following steps:
s1, controlling the temperature of the electrical steel before reaching a continuous rolling unit to be 100-380 ℃;
the electrical steel has high silicon content, large cold continuous rolling brittleness, easy rolling break and poor stability; the electric steel can be heated before entering the continuous rolling unit, so that the plasticity of the electric steel can be improved, and the rolling break risk is reduced. The temperature can be realized by continuous heating, and the electrical steel after rapid heating enters the 1 st frame at intervals of 1-20s, preferably 1-10s, and the shorter the time, the smaller the heat loss and the higher the temperature.
Specifically, the temperature of the control electrical steel before reaching the continuous rolling mill train is 100-380 ℃, and specifically comprises:
s11, obtaining the cold continuous rolling speed V of the electrical steel; the cold continuous rolling speed V generally refers to the speed of the electrical steel passing through the last frame of the continuous rolling mill, the electrical steel refers to high-magnetic induction oriented silicon steel with magnetic induction strength not lower than 1.88T and high-grade non-oriented silicon steel for new energy automobiles, the silicon mass fraction of the electrical steel is generally in the range of 3-5%, the silicon content is high, the brittleness is high during cold continuous rolling, and the deformation heat quantity is high. The cold continuous rolling speed V can be obtained according to a speed detector at the outlet of the end frame, and can also be obtained according to the linear speed of the working roller of the end frame, and the method is not limited. Generally, the cold continuous rolling speed V is smaller than the maximum rolling speed allowed by the self equipment of the continuous rolling unit, and if the cold continuous rolling speed V is too large, the deformation heat and the friction heat are rapidly increased, so that the surface quality of the electrical steel is reduced to a certain extent, and the product quality is influenced; if the cold continuous rolling speed V is too small, the production efficiency is affected to a certain extent.
S12, when the cold continuous rolling speed V is smaller than b, controlling the heating temperature T of the electrical steel before reaching a continuous rolling unit 1 130-380 ℃; when the cold continuous rolling speed V is more than or equal to b, controlling the heating temperature T of the electrical steel before reaching a continuous rolling unit 2 At 100-300 ℃, b is 150-350 mpm and T 1 ＞T 2 。
The set value b can be obtained by calculating according to the deformation heat and friction heat of the electrical steel, namely the heat generated by thinning deformation and friction in cold continuous rolling and the heat dissipated in cold continuous rolling, and generally, when the set value b is used, the deformation heat and the friction heat can compensate the heat dissipated in the cold continuous rolling process so that the electrical steel is at the set temperature in each rack. Heating temperature T at cold continuous rolling rate V < b 1 Is greater than the heating temperature T when the cold continuous rolling speed V is more than or equal to b 2 The method considers that the lower the cold continuous rolling speed of the electrical steel in the cold continuous rolling is, the more heat is dissipated, the higher heating temperature is required to be given before the cold continuous rolling to compensate the dissipated heat, the electrical steel is ensured to approach the set temperature in each rack of the cold rolling unit, the problem of overlarge belt breakage risk caused by the overlong temperature is avoided, and meanwhile, the heat utilization rate can be improved. The strip steel of different rolls in the cold continuous rolling needs to be connected end to end in sequence to form continuous strip steel, the joint of the two rolls of strip steel is generally connected through welding to form a connecting welding line, the connecting welding line is generally rolled in a continuous rolling unit at a low speed, namely the rolling speed of the head and the tail of each roll of strip steel is lower than that of the middle part, namely the rolling speed of the connecting welding line is generally lower than b. Because the connecting weld joint is easy to break, the heating temperature is higher than the rolling speed of the middle part of the corresponding strip steel, so that the plasticity of the connecting weld joint is improved. It is necessary to say thatThe clear is: t (T) 1 ＞T 2 T of strip steel with different Si content for strip steel with same Si content 1 And T 2 This relationship may not be met.
T 1 And T 2 The value of (2) can be determined according to the silicon content of the electrical steel and the rolling reduction of each frame of the cold continuous rolling, generally, the higher the silicon content of the electrical steel is, the more deformation heat is generated under the same rolling reduction, and a pyrometer for detecting the temperature of the electrical steel at the inlet position of the continuous rolling mill is positioned at the inlet of the 1 st frame and is 2-6m away from the rolling deformation zone; in some embodiments: the mass fraction of Si in the electrical steel, T1 and T2 conform to the following relation:
when the mass fraction of Si is 3-3.5%, the temperature of T1 is 130-230 ℃, and the temperature of T2 is 100-150 ℃;
when the mass fraction of Si is 3.5 percent and less than or equal to 5 percent, the temperature of T1 is 180-380 ℃, and the temperature of T2 is 150-300 ℃.
The greater the reduction, the more heat of deformation the electrical steel generates. If T 1 The temperature is too high, so that energy waste can be caused to a certain extent; if T 1 Too low a temperature increases the risk of breakage to some extent. Similarly, T 2 The temperature is too high, so that energy waste can be caused to a certain extent; if T 1 Too low a temperature increases the risk of breakage to some extent.
In other embodiments, the difference between T1 and T2 is 30-80 ℃, because the electrical steel has a large heat dissipation capacity at low speed, and the difference between T1 and T2 is substantially a low temperature compensation value
S2, controlling the temperature of the electrical steel reaching the outlet of the 1 st frame to the i th frame of the continuous rolling unit to rise sequentially;
the 1 st frame is rolled into the electrical steel after the normalization, the grain size of the electrical steel grows up, the grain size is about 100-200 um, and the brittleness of the material is large, so that the high-temperature rolling is carried out on the front frame (1 st frame to i st frame) of the cold rolling, thereby improving the plasticity of the electrical steel and reducing the belt breakage risk. The grains are still bigger after rolling and extending through the 1 st stand, and the brittleness of the grains is higher along with the subsequent cold continuous rolling of a plurality of stands, so that the temperature of the electric steel reaching the outlet of the 1 st stand to the i th stand is gradually increased to be matched with the brittleness of the electric steel, the electric steel is always in a certain plastic state, and the risk of breakage of the electric steel from the 1 st stand to the i th stand is reduced. And i is less than or equal to n-2, n is the number of frames of the continuous rolling mill unit, and n is more than or equal to 5. Typically, the cold rolling mill is provided with 5, 6 or 7 stands, but of course, other numbers of stands are also possible, and the application is not particularly limited.
In some embodiments, the cold continuous rolling temperature control method further comprises: and controlling the temperature of the electrical steel reaching the outlet of the 1 st frame to be 120-200 ℃, and controlling the temperature of the electrical steel reaching the outlet of the i-th frame to be 200-350 ℃. The 1 st frame is rolled into the electrical steel after the normalization, the brittleness is large, and the crystal grains are still large after the 1 st frame is rolled and extended, so the temperature at the position is required to be not lower than 120 ℃, and the rolling edge crack is easy to occur to a certain extent when the temperature is too low. The electrical steel has undergone multiple thickness reductions, generating a significant amount of heat, so the electrical steel temperature at the i-th rack outlet location is higher than the 1-th rack outlet location; and through repeated thinning and higher temperature, the crystal grains of the electrical steel are elongated and thinned, the plasticity of the electrical steel is improved, the rolling force is reduced, and the rolling stability is improved. If the temperature at the outlet position of the ith rack is too high, the load quantity of the subsequent n-2, n-1 and n racks cooled to the product required temperature of 80-130 ℃ is increased, and the strip shape is poor due to quenching; the temperature at the exit position of the ith rack is too low and may increase the risk of belt breakage to some extent.
The temperature of the electrical steel reaching the outlet of the ith frame can be controlled by adjusting the emulsion flow of the roll gap and the cooling emulsion flow of the working roll. In some embodiments, the lubricating emulsion flow rate Q1 entering the roll gap and the cooling emulsion flow rate Q2 of the working roll of the 1 st to i th frames conform to the following rules:
when the cold continuous rolling speed V is less than V < a, Q1 and Q2 are both 0; at the moment, the cold continuous rolling speed is low, the heat dissipation capacity is high, and the temperature control can be realized without lubrication and cooling. For example, equipment failure or breakage occurs, when the strip is started after the treatment is finished, the running speed of the strip steel is gradually increased from 0, the running speed is small, and the emulsion entering the roll gap and the cooling emulsion are closed when high temperature is needed.
When the cold continuous rolling speed V is a less than or equal to V < b, Q1 is the maximum lubricating emulsion flow rate X m allowed by the equipment, the value of m is 15-25%, Q2 is the maximum cooling emulsion flow rate X n allowed by the equipment, the value of n is 25-35%, wherein the maximum lubricating emulsion flow rate allowed by the equipment and the maximum cooling emulsion flow rate allowed by the equipment are related to the equipment, and can be 2000L/min, for example; at this time, the running speed of the strip steel is gradually increased after the continuous rolling unit is started, lubrication is needed, and only small flow control can be adopted for obtaining high temperature.
When the cold continuous rolling speed V is b less than or equal to V less than c, Q1 is the maximum lubricating emulsion flow rate x m+x x k1 allowed by the equipment, Q2 = the maximum cooling emulsion flow rate x n+x x k2 allowed by the equipment, x is the speed variation, k1 is the roll gap speed flow coefficient, and k2 is the roll cooling speed flow coefficient; at the moment, the cold continuous rolling speed is high, the heat dissipation capacity is low, and the deformation heat is excessive, so that the emulsion flow and the cooling emulsion flow are improved to control the temperature of the electrical steel. The values of k1 and k2 relate to the tandem mill train, where k1 and k2 each represent a change in emulsion flow corresponding to each increase in speed of 100mpm in each stand, and in some embodiments, the value of k1 may be 200, the value of k2 may be 300, and in other embodiments, k1 and k2 may be other values, which is not limited in this application.
When the cold continuous rolling speed V is V not less than c, the heat dissipation requirement is maximum, Q1 and Q2 are respectively the maximum lubricating emulsion flow allowed by the equipment and the maximum cooling emulsion flow allowed by the equipment, a and c are set values, the value of a can be 30-60mpm, such as 45mpm, 50mpm and the like, and the value of c can be 350-800mpm, such as 380mpm, 360mpm and the like.
In some embodiments, the cold rolling reduction of each of the 1 st to i th stands is 25-45%. The high-temperature rolling of the deformation zone is guaranteed to improve the plasticity of the material through the rolling temperature rise of 50-150 ℃, preferably 80-150 ℃ of each frame from the 1 st frame to the i th frame, and meanwhile, the temperature reaches 200-350 ℃ when the electrical steel reaches the outlet position of the i th frame through the heat transfer of strip steel, rollers, emulsion and environment.
In some embodiments, the cold rolling reduction rate of each of the 1 st to i th frames is 25-45%, and the control of the cold rolling reduction rate ensures the rolling target size of the electrical steel on one hand, and on the other hand, the control is matched with the emulsion flow rate and the cooling emulsion flow rate to control the temperature of the electrical steel at the outlet position of each frame, if the cold rolling reduction rate is too high, the deformation heat is increased, but the risk of breakage is increased to a certain extent; if the cold rolling reduction is too low, the deformation heat can be reduced, and the set temperature can be reached by controlling the emulsion flow and the cooling emulsion flow, but if the flow is too low, the spray surface is uneven to a certain extent, chromatic aberration is formed at high temperature, and the product quality is reduced.
S3, controlling the temperature of the electrical steel reaching the (i+1) th frame to the (n) th frame of the continuous rolling unit to be reduced in sequence;
the electrical steel is rolled by the front section frame, the crystal grains are elongated and refined, and the plasticity is improved, so that the electrical steel has good rolling stability in the rear section frame, and the surface quality of the product can be improved by cooling and rolling.
In some embodiments, the temperature of the electrical steel reaching the outlet of the (i+1) th rack is 50-100 ℃, and the temperature of the electrical steel reaching the outlet of the (n) th rack is 80-130 ℃. The surface quality of the electrical steel can be ensured by controlling the temperature of the electrical steel at the outlet position of the i+1th rack and when the electrical steel reaches the outlet position of the n-1 th rack, and when the temperature of the electrical steel at the outlet position of the n-1 th rack is too high, oil burning spots are easily formed by residual emulsion on the surface, so that the product quality is reduced; when the temperature is too low, the deformation resistance is increased, the rolling force is increased, and the control of the plate shape of the chilled finished product is not facilitated. The temperature of the electrical steel at the i+1-th rack outlet position and when the electrical steel reaches the n-th rack outlet position can be achieved by controlling the emulsion flow rate and the cooling emulsion flow rate.
In some embodiments, the lubricating emulsion flow Q3 from the (i+1) th frame to the (n) th frame entering the roll gap and the cooling emulsion flow Q4 of the working roll meet the following rules:
when the cold continuous rolling speed V is less than V < a, Q3 and Q4 are both 0; when the car is started after the fault, the cold continuous rolling speed is low, self-deformation heat and friction heat are less, and at the moment, the emulsion entering the roll gap and the cooling emulsion are closed.
When the cold rolling speed V is a less than or equal to V and less than b, Q3 is the maximum lubricating emulsion flow rate X m allowed by the equipment, the value of m is 15-25%, Q4 is the maximum cooling emulsion flow rate X n allowed by the equipment, and the value of n is 25-35%; the cold continuous rolling speed gradually increases, and lubrication is needed, but only a small flow of roll gap emulsion and a small flow of cooling emulsion can be adopted for lubrication to obtain high temperature.
When the cold continuous rolling speed V is V not less than b, Q3 and Q4 are respectively the maximum lubricating emulsion flow allowed by the equipment and the maximum cooling emulsion flow allowed by the equipment. The cold continuous rolling speed is high, the deformation heat is high, the heat dissipation requirement is high, and the cooling emulsion of the roll gap emulsion is maximized.
It should be noted that: the cooling emulsion can be realized by the emulsion spraying device, each rack is provided with the emulsion spraying device, the emulsion spraying device comprises a spraying beam which is parallel to the axial direction of the working roll, the spraying beam is provided with a cooling channel and spray holes which are communicated with the cooling channel, the cooling emulsion can enter the cooling channel, the cooling emulsion in the cooling channel is sprayed to the working roll through the spray holes so as to cool the working roll, the spray holes can be arranged in a plurality, the spray holes are sequentially arranged at intervals along the length direction of the spraying beam, and the cooling capacity of the spraying beam to the working roll is controlled by controlling the flow rate of the cooling emulsion, the quantity of the spray holes of the cooling emulsion and the aperture, for example, the cooling capacity of the spraying beam can be 30-50 ℃/min, the cooling coefficient of the spraying beam can be 100-300 l/min/DEGC, and the opening quantity of the cooling emulsion of the spraying beam can be controlled according to the cooling capacity and the cooling coefficient of the spraying beam so as to control the temperature of the electric steel and the working roll in each rack.
In some embodiments, the rolling reduction of the i+1th frame to the n-th frame is 6-28%, preferably 10-23%, more preferably 10-17%, and the purpose of the electrical steel in the rear frame is to ensure that the rolling reduction is smaller than that of the front frame, if the rolling reduction of the rear frame is too large, the rolling force is large, the rolled plate is easy to form a composite wave shape, and the plate shape accuracy of the finished product is affected. When the tandem rolling mill is 6 tandem rolling mill, the value of i can be 3 or 4. If the rolling reduction of the rear section frame is too small, poor lubrication of the roll gap is easily caused to a certain extent.
In some embodiments, the thickness of the electrical steel before cold continuous rolling is 1.6-3.0 mm, and the thickness after cold continuous rolling is 0.15-0.65 mm.
The cold continuous rolling temperature control method of the electrical steel of the present application will be further described with reference to specific examples
a has a value of 55mpm, b has a value of 140mpm, c has a value of 750mpm, and the tandem rolling mill is a six-frame tandem rolling mill. The maximum lubrication emulsion flow rate allowed by the equipment of each rack is 1500L/min, 2000L/min,3000L/min and 300L/min respectively; the maximum cooling emulsion flow rate allowed by each rack device is 2000L L/min, 2500L/min,3000L/min and 3000L/min respectively; m is 20%, n is 30%, k1 is 200, k2 is 300, and i=3.
Step 1: in the process that the first coil of electrical steel enters a cold rolling unit for continuous rolling, the cold continuous rolling speed of the electrical steel is 800mpm,800mpm is more than 140mpm,800mpm is more than 750mpm, si content is 3.1%,3.1% is in the range of 3-3.5%, heating temperature of the electrical steel is confirmed to be T2=130 ℃, lubricating emulsion flow rate of each rack is respectively 1500L/min, 2000L/min,3000L/min and 300L/min, and cooling emulsion flow rate of working rolls of each rack is respectively 2000L L L/min, 2500L/min,3000L/min and 3000L/min.
Step 2: the heating temperature, the flow rate of the lubricating emulsion and the flow rate of the cooling emulsion determined according to the step 1 are determined so that the temperatures at which the electrical steel reaches the outlets of the 1 st to 6 th stands are 120 ℃, 170 ℃, 230 ℃, 140 ℃, 130 ℃ and 105 ℃, respectively.
Step 3: when the electric steel is rolled to a position, close to the strip tail, of the first coiled strip steel, in order to avoid the connection welding seam of the two coils of strip steel from being broken, the cold continuous rolling speed of the electric steel is reduced from 800mpm to 120mpm, the 120mpm is positioned between 55mm and 140mm, and the heating temperature of the electric steel is adjusted to T1=200 ℃;
in the process of reducing the 800mpm to 750mpm, the lubricating emulsion flow rate of each rack is still 1500L/min, 2000L/min,3000L/min and 300L/min respectively, and the cooling emulsion flow rate of the working rolls of each rack is 2000L/min, 2500L/min,3000L/min and 3000L/min respectively.
In the course of 750mpm reduction to 140mpm, the lubricating emulsion flow rates of the 1 st rack to the 3 rd rack are respectively 1500 x 20% +200 x (800-750)/100=600L/min, 2000 x 20% +200 x (800-750)/100=700L/min, and the cooling emulsion flow rates of the 1 st rack to the 3 rd rack are respectively 2000 x 30% +300 x (800-750)/100=1050L/min, 2500 x 30% +300 x (800-750)/100=1200L/min; the lubricating emulsion flow rates of the 4 th frame to the 6 th frame are 2000L/min,3000L/min and 300L/min respectively, and the cooling emulsion flow rates of the 4 th frame to the 6 th frame are 2500L/min,3000L/min and 3000L/min respectively.
In the process of reducing 140mpm to 120mpm, the lubricating emulsion flow rate of each rack is 1500 x 20% = 300L/min,2000 x 20% = 400L/min,3000 x 20% = 600L/min; the cooling emulsion flow rates of the racks are 2000 x 30% = 600L/min,2500 x 30% = 750L/min,3000 x 30% = 900L/min, respectively.
Step 4: when the electrical steel is rolled to the middle position of the second coil of strip steel (Si content is 3.1%), the speed is restored to 800mpm, the heating temperature of the electrical steel is regulated to T2=130 ℃, the lubricating emulsion flow rate of each rack is the maximum lubricating emulsion flow rate allowed by the equipment, the cooling emulsion flow rate of the working roller of each rack is the maximum cooling emulsion flow rate allowed by the equipment, and the temperatures of the electrical steel reaching the outlets of the 1 st rack to the 6 th rack are 160 ℃, 220 ℃,300 ℃, 180 ℃,150 ℃ and 110 ℃ respectively.
Step 5: in the second coil rolling process, the strip breakage happens suddenly, the rolling is restarted after the fault is eliminated, the cold continuous rolling speed of the second coil electrical steel is gradually increased from 0, the heating temperature is T1=200 ℃, the lubricating emulsion flow of each rack and the cooling emulsion flow of the working roller of each rack are both 0, and the temperatures of the electrical steel reaching the outlets of the 1 st rack to the 6 th rack are 210 ℃, 230 ℃,300 ℃, 180 ℃, 160 ℃ and 115 ℃ respectively.
Step 6: after the second rolling is finished, a third strip steel is cold rolled, the Si content of the third strip steel is 4.5%, the Si content is in the range of 3.5% < Si less than or equal to 5%, the rolling speed is 800mpm,800mpm is more than 140mpm,800mpm is more than 750mpm, the heating temperature of the third strip steel before entering a continuous rolling unit is T2=220 ℃, the lubricating emulsion flow rate of each rack is the maximum lubricating emulsion flow rate allowed by equipment, the cooling emulsion flow rate of the working rolls of each rack is the maximum cooling emulsion flow rate allowed by equipment, and the temperature of the electrical steel reaching the outlet of the 1 st rack to the 6 th rack is 260 ℃, 280 ℃, 330 ℃, 190 ℃, 160 ℃ and 115 ℃ respectively.
According to the invention, by controlling the temperature before and during cold continuous rolling of the electrical steel, heating is performed before cold continuous rolling, a heat basis is provided for cold continuous rolling, the plasticity of the electrical steel is improved, and the temperature of a front-stage frame in cold continuous rolling is increased, so that the risk of breakage caused by large brittleness of the grain size of the electrical steel is reduced; the grain extension refinement after the front end frame rolling is favorable to improving the plasticity, and the rear end frame cooling rolling ensures the surface quality of the electrical steel. The invention reduces the rolling stability of the electrical steel in each frame by heating before rolling, heating and rolling in the front section and cooling and rolling in the rear section, ensures the breakage rate to be no more than 11 per mill, and also ensures the surface quality.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (3)
1. The cold continuous rolling temperature control method of the electrical steel is characterized by comprising the following steps of:
controlling the temperature of the electrical steel before reaching the continuous rolling unit to be 100-380 ℃; the temperature of the control electrical steel before reaching the continuous rolling unit is 100-380 ℃, and the control electrical steel specifically comprises: obtaining the cold continuous rolling speed V of the electrical steel; when the cold continuous rolling speed V is smaller than b, controlling the heating temperature T of the electrical steel before reaching a continuous rolling unit 1 130-380 ℃; when the cold continuous rolling speed V is more than or equal to b, controlling the heating temperature T of the electrical steel before reaching a continuous rolling unit 2 At 100-300 ℃, b is 150-350 mpm and T 1 ＞T 2 The method comprises the steps of carrying out a first treatment on the surface of the The mass fraction of Si in the electrical steel, T1 and T2 conform to the following relation: when the mass fraction of Si is 3-3.5%, the temperature of T1 is 130-230 ℃, and the temperature of T2 is 100-150 ℃; when the mass fraction of Si is 3.5 percent and less than or equal to 5 percent, the temperature of T1 is 180-380 ℃, and the temperature of T2 is 150-300 ℃; the difference between the T1 and the T2 is 30-80 ℃;
controlling the temperature of the electrical steel reaching the outlet of the 1 st frame to the i th frame of the continuous rolling unit to rise sequentially;
controlling the temperature of the electrical steel reaching the (i+1) th frame to the (n) th frame of the continuous rolling unit to be reduced in sequence;
wherein the temperature of the electric steel reaching the outlet of the (i+1) th frame is lower than that of the outlet of the (i) th frame, n is the number of frames of the continuous rolling unit, and n is more than or equal to 5,i and less than or equal to n-2;
the cold continuous rolling temperature control method further comprises the following steps: controlling the temperature of the electrical steel reaching the outlet of the 1 st frame to be 120-200 ℃, and controlling the temperature of the electrical steel reaching the outlet of the i-th frame to be 300-350 ℃;
the lubricating emulsion flow Q1 entering the roll gap from the 1 st frame to the i th frame and the cooling emulsion flow Q2 of the working roll accord with the following rules:
when the cold continuous rolling speed V is less than V < a, Q1 and Q2 are both 0;
when the cold continuous rolling speed V is a less than or equal to V and less than b, Q1 is the maximum lubricating emulsion flow rate X m allowed by the equipment, the value of m is 15-25%, Q2 is the maximum cooling emulsion flow rate X n allowed by the equipment, and the value of n is 25-35%;
when the cold continuous rolling speed V is b less than or equal to V less than c, Q1 is the maximum lubricating emulsion flow rate x m+x x k1 allowed by the equipment, Q2 = the maximum cooling emulsion flow rate x n+x x k2 allowed by the equipment, x is the speed variation, k1 is the roll gap speed flow coefficient, and k2 is the roll cooling speed flow coefficient;
when the cold continuous rolling speed V is V more than or equal to c, Q1 and Q2 are respectively the maximum lubricating emulsion flow allowed by the equipment and the maximum cooling emulsion flow allowed by the equipment, and a and c are set values;
the lubricating emulsion flow Q3 of the ith and nth frames entering the roll gap and the cooling emulsion flow Q4 of the working roll accord with the following rules:
when the cold continuous rolling speed V is less than V < a, Q3 and Q4 are both 0;
when the cold continuous rolling speed V is a less than or equal to V and less than b, Q3 is the maximum lubricating emulsion flow rate X m allowed by the equipment, the value of m is 15-25%, Q4 is the maximum cooling emulsion flow rate X n allowed by the equipment, and the value of n is 25-35%;
when the cold continuous rolling speed V is V not less than b, Q3 and Q4 are respectively the maximum lubricating emulsion flow allowed by the equipment and the maximum cooling emulsion flow allowed by the equipment.
2. The method for controlling the cold continuous rolling temperature of electrical steel according to claim 1, wherein the cold rolling reduction rate of each of the 1 st to i th stands is 25 to 45%.
3. The cold continuous rolling temperature control method of electrical steel according to claim 1, wherein the rolling reduction rates of the i+1th frame to the n-th frame are all 6-28%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310288639.3A CN116060454B (en) | 2023-03-23 | 2023-03-23 | Cold continuous rolling temperature control method for electrical steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310288639.3A CN116060454B (en) | 2023-03-23 | 2023-03-23 | Cold continuous rolling temperature control method for electrical steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116060454A CN116060454A (en) | 2023-05-05 |
| CN116060454B true CN116060454B (en) | 2023-06-30 |
Family
ID=86177124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310288639.3A Active CN116060454B (en) | 2023-03-23 | 2023-03-23 | Cold continuous rolling temperature control method for electrical steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116060454B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU889162A1 (en) * | 1980-03-26 | 1981-12-15 | Московский Ордена Трудового Красного Знамени Институт Стали И Сплавов | Method of producing kinescope band from low-carbon electrotechnical steel |
| CN109622619B (en) * | 2018-12-27 | 2020-07-07 | 武汉乾冶工程技术有限公司 | Method for producing high-grade non-oriented electrical steel by cold continuous rolling and product thereof |
| CN112080695B (en) * | 2020-08-31 | 2021-10-26 | 江苏省沙钢钢铁研究院有限公司 | High-silicon non-oriented electrical steel and production method thereof |
| CN115318830A (en) * | 2022-06-13 | 2022-11-11 | 武汉乾冶工程技术有限公司 | Method for producing high magnetic induction oriented electrical steel by cold continuous rolling and product |
-
2023
- 2023-03-23 CN CN202310288639.3A patent/CN116060454B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN116060454A (en) | 2023-05-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6062055A (en) | Rolling method for thin flat products and relative rolling line | |
| CA2678110C (en) | Continuous annealing equipment | |
| CN105834214B (en) | Produce the temperature-controlled rolling equipment of metal plate coils | |
| JP3853428B2 (en) | Method and equipment for drawing and rolling steel pipes | |
| EP2546004B1 (en) | Hot-rolled steel sheet manufacturing method and manufacturing device | |
| EP2969277B1 (en) | Manufacturing methods and apparatus for targeted cooling in hot metal rolling | |
| RU2526644C2 (en) | Steel strip hot rolling and rolling mill to this end | |
| US4151896A (en) | Method of producing machine wire by continuous casting and rolling | |
| KR101609432B1 (en) | Magnesium roll mill | |
| CN110252808B (en) | Rolling production process of ultrathin iron-chromium-aluminum alloy strip steel | |
| CN108435796A (en) | A method of prevent rolling aluminium Annealing oil stain from generating | |
| CN102658301B (en) | Control and modifying unit of scale of hot rolling strip steel | |
| CN116060454B (en) | Cold continuous rolling temperature control method for electrical steel | |
| CN111270140A (en) | Production method for improving transverse crease defect of Q235B hot-rolled steel coil | |
| CN105834227A (en) | Temperature-controlled rolling technology of magnesium alloy coiled sheet | |
| JPS61269919A (en) | Method of controlling rolling of bar or wire rod consisting of alloy steel | |
| CN109092910B (en) | Electromagnetic induction coil compensation heating equipment and method for improving rolled material quality | |
| CN115625200A (en) | Continuous coiling and rolling system and process for magnesium and magnesium alloy sheet/foil coiled material | |
| JP2655991B2 (en) | Cold rolling method for grain-oriented silicon steel sheet and roll cooling device for cold rolling mill | |
| CN113388795A (en) | Method for eliminating folds of ultrathin nickel strap | |
| JP2004090065A (en) | Heavy reduction rolling method and method for manufacturing hot-rolled steel strip by using the same | |
| CN113857251B (en) | Cold rolling device and cold rolling method for electrical steel with increased reduction rate | |
| JP3698088B2 (en) | Manufacturing method of hot-rolled steel strip | |
| JP6056549B2 (en) | Manufacturing apparatus and manufacturing method of differential steel plate | |
| JP4314800B2 (en) | Manufacturing method of hot-rolled steel strip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 064400 No. 025 Zhao'an Street, Qian'an Economic Development Zone, Tangshan City, Hebei Province Patentee after: Shougang Zhixin Electromagnetic Materials (Qian'an) Co.,Ltd. Country or region after: China Address before: 064400 No. 025, Zhao an street, western industrial area, Qian'an, Tangshan City, Hebei Patentee before: SHOUGANG ZHIXIN QIAN'AN ELECTROMAGNETIC MATERIALS Co.,Ltd. Country or region before: China |