CN110893419A - Control method for raising and buckling head of heavy and medium plate mill - Google Patents
Control method for raising and buckling head of heavy and medium plate mill Download PDFInfo
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- CN110893419A CN110893419A CN201911233417.1A CN201911233417A CN110893419A CN 110893419 A CN110893419 A CN 110893419A CN 201911233417 A CN201911233417 A CN 201911233417A CN 110893419 A CN110893419 A CN 110893419A
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- steel plate
- buckling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/72—Rear end control; Front end control
Abstract
The invention provides a control method for raising and buckling heads of a heavy and medium plate mill, which adopts the technical scheme that: the method comprises the steps that the thickness of slabs transported by a heating furnace is different, and a PLC control system calculates KP coefficients; when the thickness of the current rolling slab is more than or equal to 300mm, the steel plate is buckled, and the response time of the speed of an upper motor of the roughing mill is slowed down; when the thickness of the plate blank is less than 300mm, the response time of the speed of an upper motor of the roughing mill is shortened; sending the KP value to an ACS6000 control system through a DP communication protocol, and adjusting the KP coefficient of ACS6000 on a rolling mill when rolling the head of a steel plate to realize that different KP coefficients are set for plate blanks with different thicknesses; the speed of the speed response time is adjusted by driving the upper roller and the lower roller, so that an operator can control the buckling and warping of the rolled steel plate.
Description
Technical Field
The invention relates to the technical field of rolling mill control, in particular to a control method for a raising and buckling head of a heavy and medium plate rolling mill.
Background
The rolling mill is one of the important equipment on the hot rolled steel production line, mainly comprises an upper supporting roll, a lower supporting roll, an upper working roll, a lower working roll, electrical equipment, hydraulic equipment, a roll gap adjusting device and the like, and is used for rolling steel plates with different thicknesses. The 3500mm line rolling mill transmission system adopts an ABB ACS6000 medium-pressure transmission system, has an advanced DTC control theory, has the torque response time 10 times faster than the traditional control mode of flux vector hole and pulse width modulation, and has the advantages of accurate static speed and torque control and the like. In the steel plate rolling production, due to the influence of different steel temperature, steel type, plate blank thickness and other factors, the control of the steel plate warping and the buckling head is particularly important, if the warping head of the steel plate is overlarge, the steel plate can impact an upper working roller and a water tank of a rolling mill to damage equipment such as the working roller and the water tank, if the buckling head of the rolling mill is overlarge, the steel plate can impact a lower working roller of the rolling mill and roller ways at an inlet and an outlet, the motor and the bearing seat of the roller ways are easily damaged, and meanwhile, the surface quality of the steel plate cannot be guaranteed.
How to solve the above technical problems is the subject of the present invention.
Disclosure of Invention
The invention aims to provide a control method for a raising and buckling head of a heavy and medium plate mill.
The design idea of the invention is as follows: according to the different thickness of the plate blank transported by the heating furnace, different KP values are written in after the calculation of the PLC, and the KP values are sent to an ACS6000 control system through a DP communication protocol, so that the KP coefficients of the ACS6000 on the rolling mill are adjusted when the head of the steel plate is rolled, different KP coefficients are set for the plate blanks with different thicknesses, and the conditions of buckling and warping of the rolled steel plate are effectively controlled by an operator through adjusting the speed response time of the upper and lower rollers in transmission.
The invention is realized by the following measures: a control method for raising and buckling heads of a heavy and medium plate mill comprises the following steps:
s1: writing different KP values after calculation through a PLC control system according to different thicknesses of slabs transported by a heating furnace;
s2: after the heating furnace taps steel, recording and latching the thickness value of the current plate blank after the plate blank inlet of the first pass collected by the roughing mill calculates the thickness, comparing the thickness value with the set plate blank thickness, when the thickness of the current rolled plate blank is more than or equal to 300mm, buckling the head of the steel plate, slowing down the response time of the speed of an upper motor of the roughing mill to control the buckling of the steel plate after the primary original functions of adjusting the tilting and buckling are adjusted to the limit value if the buckling is obvious;
s3: when the thickness of the plate blank is less than 300mm, the warping of the steel plate is obvious, the warping and head buckling functions cannot be effectively controlled, the response time of the speed of an upper motor of the roughing mill needs to be shortened, and the warping control of the steel plate is realized;
s4: sending the KP value to an ACS6000 control system through a DP communication protocol, adjusting the KP coefficient of ACS6000 on the upper roller of the rolling mill when the head of the steel plate is rolled, and setting different KP coefficients for plate blanks with different thicknesses;
s5: the speed of the speed response time is adjusted by driving the upper roller and the lower roller, so that an operator can control the buckling and warping of the rolled steel plate.
As a further optimization scheme of the control method for the raising and buckling of the heavy and medium plate mill provided by the invention, the step S4 specifically comprises the following steps: and after the thickness of the plate blank is determined, the KP value is sent to AC800M through DP communication, and the KP value is sent to a transmission parameter 211.04 through DP communication, so that the control of warping and buckling of the steel plate is realized.
As a further optimization scheme of the control method for the raising and buckling of the medium plate mill provided by the invention, the control method for the raising and buckling of the medium plate mill further utilizes high-pressure descaling water before and after the mill to control the temperature drop of the upper surface and the lower surface of a steel plate in the rolling process, if the steel plate is raised, the lower high-pressure descaling water is started, and if the steel plate is buckled, the upper high-pressure descaling water is started, so that the raising or buckling of the steel plate in the rolling process is controlled.
As a further optimization scheme of the control method for the warping and buckling head of the heavy and medium plate rolling mill, high-pressure descaling water is arranged at the front and the back of the rolling mill and divided into an upper group and a lower group, and the upper group and the lower group of high-pressure descaling water are independently controlled to be opened and closed; the high-pressure descaling water arranged in front of and behind the rolling mill is used for controlling the temperature of the upper surface and the lower surface of the steel plate.
As a further optimization scheme of the control method for the raising and buckling head of the medium plate rolling mill, when descaling is needed before rolling passes, when a steel plate is rolled from the front to the back of the rolling mill, high-pressure descaling water in front of the rolling mill is used for descaling, and simultaneously, the upper high-pressure descaling water or the lower high-pressure descaling water behind the rolling mill is started to carry out temperature reduction on the upper surface or the lower surface of the steel plate.
As a further optimization scheme of the control method for the raising and buckling head of the heavy and medium plate mill, provided by the invention, if descaling is not needed, only the upper high-pressure descaling water or the lower high-pressure descaling water is started to carry out temperature reduction on the upper surface or the lower surface of the steel plate.
After the thickness of the plate blank is determined, the KP value is determined accordingly, the KP value is sent to the AC800M through DP communication, and the KP value is sent to the transmission parameter 211.04 through DP communication, so that the control of the warping and the head buckling of the steel plate is realized.
After the heating furnace taps steel, the thickness of the slab inlet of the first pass collected by the roughing mill is calculated, the current slab thickness value is recorded and latched, and compared with the set slab thickness, when the thickness of the current rolled slab is larger than or equal to 300mm, the head of the steel plate is seriously buckled, and the head of the steel plate is still obvious after the function of the primary SKI (adjusting the tilting and the head of the steel plate) is adjusted to the limit value, so that the response time of the speed of an upper motor of the roughing mill is slowed down, and the effective control of the head of the steel plate is achieved. When the thickness of the plate blank is less than 300mm, the warping of the steel plate is obvious, and the SKI (adjusting warping and buckling) function cannot be effectively controlled, so that the response time of the motor speed of the roughing mill is shortened, and the warping control of the steel plate is realized.
The invention has the beneficial effects that: according to the different thicknesses of the slabs transported by the heating furnace, different KP values are written in after calculation by a PLC control system, and then the KP values are sent to an ACS6000 control system by a DP communication protocol, so that the KP coefficients of ACS6000 on an upper roller of a rolling mill are adjusted when the head of a steel plate is rolled, the slabs with different thicknesses are set with different KP coefficients, and therefore, operators are helped to effectively control the buckling and warping conditions of the rolled steel plate by adjusting the speed response time of the upper roller and the lower roller in a transmission manner; the invention also utilizes the high-pressure descaling water before and after the rolling mill to control the surface temperature of the steel plate in the process of rolling the thick plate, and can also effectively control the problem of head warping or head buckling in the process of rolling the thick plate, protect the thick plate rolling mill and ensure the smooth completion of the rolling of the thick plate; the method can effectively control the temperature drop of the upper surface and the lower surface of the steel plate, so that the temperature difference of the upper surface and the lower surface of the steel plate in the rolling process is in a certain range, the problem of head warping or head buckling of the steel plate is avoided, and the method is easy, simple and convenient to control.
Drawings
FIG. 1 is a flow chart of a control method for raising and buckling the heavy plate mill in the invention;
FIG. 2 is a table of transmission parameters that the ACS6000 may need to modify in accordance with the present invention; wherein 211.04, 211.05 are the main modified values;
FIG. 3 is a diagram of a new program segment for the TCS of the rolling mill in the present invention;
wherein ① is a rolling pass, ② is a corresponding KP value selected according to the thickness of the plate blank, ③ is a first-level KP value finally issued;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
Referring to fig. 1, the invention provides a technical scheme that a control method for raising and buckling heads of a heavy and medium plate mill comprises the following steps:
s1: writing different KP values after calculation through a PLC control system according to different thicknesses of slabs transported by a heating furnace;
s2: after the heating furnace taps steel, recording and latching the thickness value of the current plate blank after the plate blank inlet of the first pass collected by the roughing mill calculates the thickness, comparing the thickness value with the set plate blank thickness, when the thickness of the current rolled plate blank is more than or equal to 300mm, buckling the head of the steel plate, slowing down the response time of the speed of an upper motor of the roughing mill to control the buckling of the steel plate after the primary original functions of adjusting the tilting and buckling are adjusted to the limit value if the buckling is obvious;
s3: when the thickness of the plate blank is less than 300mm, the warping of the steel plate is obvious, the warping and head buckling functions cannot be effectively controlled, the response time of the speed of an upper motor of the roughing mill needs to be shortened, and the warping control of the steel plate is realized;
s4: sending the KP value to an ACS6000 control system through a DP communication protocol, adjusting the KP coefficient of ACS6000 on the upper roller of the rolling mill when the head of the steel plate is rolled, and setting different KP coefficients for plate blanks with different thicknesses;
s5: the speed of the speed response time is adjusted by driving the upper roller and the lower roller, so that an operator can control the buckling and warping of the rolled steel plate.
Specifically, the step S4 specifically includes: and after the thickness of the plate blank is determined, the KP value is sent to AC800M through DP communication, and the KP value is sent to a transmission parameter 211.04 through DP communication, so that the control of warping and buckling of the steel plate is realized.
Specifically, the control method for raising and buckling the medium plate mill further utilizes high-pressure descaling water before and after the mill to control the temperature drop of the upper and lower surfaces of the steel plate in the rolling process, if the steel plate is raised, the lower high-pressure descaling water is started, and if the steel plate is buckled, the upper high-pressure descaling water is started, so that the raising or buckling of the steel plate in the rolling process is controlled.
Specifically, high-pressure descaling water is arranged at the front and the rear of the rolling mill and divided into an upper group and a lower group, and the upper group and the lower group of high-pressure descaling water are independently controlled to be opened and closed; the high-pressure descaling water arranged in front of and behind the rolling mill is used for controlling the temperature of the upper surface and the lower surface of the steel plate.
Specifically, when descaling is needed before a rolling pass, and when a steel plate is rolled from the front to the back of a rolling mill, high-pressure descaling water in front of the rolling mill is used for descaling, the upper high-pressure descaling water or the lower high-pressure descaling water behind the rolling mill is started to perform temperature reduction on the upper surface or the lower surface of the steel plate.
Specifically, if the descaling is not needed, only the upper high-pressure descaling water or the lower high-pressure descaling water is started to carry out temperature reduction on the upper surface or the lower surface of the steel plate.
As can be seen from FIG. 2, after the thickness of the slab is determined, the KP value is also determined, and the KP value is sent to the AC800M through DP communication, and then the KP value is sent to the transmission parameter 211.04 through DP communication, so that the control of warping and buckling of the steel plate is realized.
As can be seen from fig. 3, after the heating furnace taps steel, the thickness of the slab inlet of the first pass collected by the roughing mill is calculated, the current slab thickness value is recorded and latched, and compared with the set slab thickness, when the current rolled slab thickness is greater than or equal to 300mm, the steel plate buckle head is serious, and after the original SKI (adjustment warping, buckle head) function of the first stage is adjusted to the limit value, the buckle head is still obvious, so that the response time of the upper motor speed of the roughing mill is slowed down, and the effective control of the steel plate buckle head is achieved. When the thickness of the plate blank is less than 300mm, the warping of the steel plate is obvious, and the SKI (adjusting warping and buckling) function cannot be effectively controlled, so that the response time of the motor speed of the roughing mill is shortened, and the warping control of the steel plate is realized.
The invention can write different KP values after being calculated by a PLC according to different thicknesses of the plate blanks transported by a heating furnace, and then send the KP values to an ACS6000 control system by a DP communication protocol, thereby realizing the adjustment of the KP coefficients of ACS6000 on the upper roller of a rolling mill when the head of a steel plate is rolled, realizing the setting of different KP coefficients on the plate blanks with different thicknesses, and further realizing the help of operators to effectively control the buckling and warping conditions of the rolled steel plate by driving the upper roller and the lower roller to adjust the speed response time; the invention also utilizes the high-pressure descaling water before and after the rolling mill to control the surface temperature of the steel plate in the process of rolling the thick plate, can effectively control the problem of head warping or head buckling in the process of rolling the thick plate, protects the thick plate rolling mill and ensures the smooth completion of the rolling of the thick plate. Compared with the existing control method, the method can effectively control the temperature drop of the upper surface and the lower surface of the steel plate, so that the temperature difference of the upper surface and the lower surface of the steel plate in the rolling process is in a certain range, the problem of head warping or head buckling of the steel plate is avoided, and the method is easy and simple to control.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A control method for raising and buckling heads of a heavy and medium plate mill is characterized by comprising the following steps:
s1: writing different KP values after calculation through a PLC control system according to different thicknesses of slabs transported by a heating furnace;
s2: after the heating furnace taps steel, recording and latching the thickness value of the current plate blank after the plate blank inlet of the first pass collected by the roughing mill calculates the thickness, comparing the thickness value with the set plate blank thickness, when the thickness of the current rolled plate blank is more than or equal to 300mm, buckling the head of the steel plate, slowing down the response time of the speed of an upper motor of the roughing mill to control the buckling of the steel plate after the primary original functions of adjusting the tilting and buckling are adjusted to the limit value if the buckling is obvious;
s3: when the thickness of the plate blank is less than 300mm, the warping of the steel plate is obvious, the warping and head buckling functions cannot be effectively controlled, the response time of the speed of an upper motor of the roughing mill needs to be shortened, and the warping control of the steel plate is realized;
s4: sending the KP value to an ACS6000 control system through a DP communication protocol, adjusting the KP coefficient of ACS6000 on the upper roller of the rolling mill when the head of the steel plate is rolled, and setting different KP coefficients for plate blanks with different thicknesses;
s5: the speed of the speed response time is adjusted by driving the upper roller and the lower roller, so that an operator can control the buckling and warping of the rolled steel plate.
2. The method for controlling the raising and buckling of the heavy and medium plate mill according to claim 1, wherein the step S4 comprises the following steps: and after the thickness of the plate blank is determined, the KP value is sent to AC800M through DP communication, and the KP value is sent to a transmission parameter 211.04 through DP communication, so that the control of warping and buckling of the steel plate is realized.
3. The method for controlling the raising and buckling of the medium plate mill according to claim 1 or 2, wherein the method for controlling the raising and buckling of the medium plate mill further controls the temperature drop of the upper surface and the lower surface of the steel plate in the rolling process by using high-pressure descaling water before and after the mill in the rolling process, if the steel plate is raised, the lower high-pressure descaling water is started, and if the steel plate is buckled, the upper high-pressure descaling water is started, so that the raising or buckling of the steel plate in the rolling process is controlled.
4. The method for controlling the raising and buckling head of the medium plate mill according to claim 3, wherein the high-pressure descaling water is respectively arranged at the front and the rear of the mill and divided into an upper group and a lower group, and the upper group and the lower group of the high-pressure descaling water are independently controlled to be opened and closed; the high-pressure descaling water arranged in front of and behind the rolling mill is used for controlling the temperature of the upper surface and the lower surface of the steel plate.
5. The method for controlling the raising and buckling of the heavy and medium plate mill according to claim 4, wherein when the steel plate is required to be descaled before the rolling pass, when the steel plate is rolled from the front to the back of the rolling mill, and when the high-pressure descaling water in front of the rolling mill is used for descaling, the upper high-pressure descaling water or the lower high-pressure descaling water behind the rolling mill is started to perform temperature reduction on the upper surface or the lower surface of the steel plate.
6. The raising and buckling control method for the heavy and medium plate mill according to any one of claims 2 to 5, wherein if descaling is not required, only the upper high-pressure descaling water or the lower high-pressure descaling water is started to perform temperature reduction on the upper surface or the lower surface of the steel plate.
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| CN111659767A (en) * | 2020-05-14 | 2020-09-15 | 浙江天骄轴承制造有限公司 | Square rail multi-direction straightener |
| CN112893475A (en) * | 2021-01-11 | 2021-06-04 | 山西太钢不锈钢股份有限公司 | Control method for buckling end of plate blank |
| CN113333476A (en) * | 2021-06-17 | 2021-09-03 | 中天钢铁集团有限公司 | Rolling mill speed regulating method based on alternative rolling of continuous casting billets of different specifications |
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