CN114905019A - Intelligent control method for cutting machine gun speed based on online blank temperature detection - Google Patents
Intelligent control method for cutting machine gun speed based on online blank temperature detection Download PDFInfo
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- 238000005520 cutting process Methods 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 238000005266 casting Methods 0.000 claims abstract description 75
- 230000008569 process Effects 0.000 claims abstract description 24
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 20
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 239000003034 coal gas Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/163—Controlling or regulating processes or operations for cutting cast stock
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
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- 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
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to an intelligent control method for the gun speed of a cutting machine based on-line blank temperature detection, which comprises the following steps: step 1: actually measuring the surface temperature distribution characteristics of the casting blank under different pulling speeds and different working conditions, wherein the surface temperature distribution characteristics of the casting blank are used as basic basis for setting the starting cutting speed and the cruising gun speed of the temperature cutting edge of the casting blank under different working conditions; step 2: determining the cutting cruising gun speed of casting blanks with different blank temperatures; and 3, step 3: setting an intelligent control system for the gun speed of the cutting machine based on a temperature measurement system; and 4, step 4: after a prepressing signal of the cutting machine is received, scanning once temperature measurement data by taking 500ms as a period; and 5: according to the temperature measurement data, outputting the corresponding cruise gun speed in a matching manner, and calling the corresponding starting gun speed according to the determined cruise gun speed; step 6: and finishing the intelligent control process of the gun speed of the cutting machine.
Description
Technical Field
The invention relates to a control method, in particular to an intelligent control method for the gun speed of a cutting machine based on-line billet temperature detection, and belongs to the technical field of ferrous metallurgy continuous casting.
Background
The large slab caster mostly adopts a flame cutting machine to cut the casting blank into a fixed-length slab on line. The basic principle of the flame cutting machine is as follows: preheating flame premelting the surface of the slab, continuously melting the billet by high-pressure cutting oxygen jet flow, blowing away the molten steel to form a slot, and cutting off the casting blank. The flame cutting machine has the advantages that the flame cutting machine is not limited by the size of a casting blank and can cut the large casting blank on line; the shape of the cut casting blank is regular and has no deformation. In the current continuous casting actual production process, the gun speed of a cutting machine is mostly controlled by adopting a fixed gun speed, when the continuous casting process (pulling speed and secondary cooling process) changes, particularly when the typical abnormal working conditions (such as casting starting, quick change tundish, final casting, abnormal shutdown and the like) occur, the surface temperature of a casting blank changes greatly (600 ℃ -1150 ℃), the casting blanks with different surface temperatures are subjected to flame cutting at the fixed gun speed, and the problems that the casting blank is not cut continuously when the gun speed of a low-temperature casting blank is too fast, the metal yield is low when the gun speed of a high-temperature casting blank is too slow, and the energy consumption is large occur.
Through the search of the inventor, the related patents and documents of the continuous casting cutting disclosed at present focus on the technical development of the manufacturing of the cutting machine, the form optimization of the cutting nozzle and the like, and the patent or report on the aspect of carrying out the intelligent control of the gun speed of the cutting machine by using the online temperature detection as the basis is disclosed.
In view of the problems existing in the slab flame cutting process, the continuous casting process needs to have a simple, stable and reliable continuous casting process, the proper cutting gun speed is determined according to the real-time adjustment of the surface temperature of the casting blank under different working conditions, the purposes of stable cutting off of the casting blank, reasonable slot cutting, energy conservation and consumption reduction are achieved, at present, no gun speed online real-time control device is arranged on all slab continuous casting flame cutting machines at home and abroad, and the fixed gun speed is adopted, so that a new scheme is urgently needed to solve the technical problems.
Disclosure of Invention
The invention provides an intelligent control method for the gun speed of a cutting machine based on-line blank temperature detection, aiming at the problems in the prior art. The abnormal working condition position output by the casting blank tracking value is not relied on any more or the surface temperature of the casting blank is judged manually, so that the purpose of intelligently controlling the speed of the cutting gun is achieved.
In order to achieve the purpose, the technical scheme of the invention is that the intelligent control method for the gun speed of the cutting machine based on-line blank temperature detection comprises the following steps:
step 1: actually measuring the surface temperature distribution characteristics of the casting blank under different pulling speeds and different working conditions, wherein the surface temperature distribution characteristics of the casting blank are used as basic basis for setting the starting cutting speed and the cruising gun speed of the temperature cutting edge of the casting blank under different working conditions;
1.1 measuring the surface temperature of the casting blank at different pulling speed stages during normal production at a cutting origin;
1.2, the surface temperature of the casting blank under three different working conditions of stopping in the process of measuring and pouring at the cutting original point, quickly changing a tundish, casting a new tundish and the like;
1.3 measuring the temperature of two different points of the casting blank at the cutting origin by taking the center line of the casting blank as a reference according to the distance of 100mm-200 mm.
Step 2.: determining the cutting cruising gun speed of casting blanks with different blank temperatures;
2.1 determination of basic process data of cutting: cutting coal and oxygen, wherein the oxygen pressure is 1.0-1.3MPa, the oxygen flow is 300-450L/min, the coal gas pressure is 0.7-0.9MPa, the coal gas flow is 30-50L/min, and the maximum cutting gun speed is 400-450 mm/min;
2.2 cruise gun speed test at different blank temperatures (different pulling speeds and typical working conditions). 3 testing gun speeds are preset under different working conditions and are respectively tested for 10 times, and the temperature of the center line of a casting blank, the width of a cutting seam, the length of molten steel and the cutting integrity are measured;
2.3, fitting an optimal casting blank surface temperature-cruise gun speed curve according to an actual measurement result;
2.4 determining the starting gun speed under the condition of different cruising gun speeds (the temperature gradients of the casting blanks with different surface temperatures in the width direction at the position above 100 away from the edge are small and are within 20 ℃, but the temperature is reduced by more than 50 ℃ in the range of 100mm away from the edge, and the cutting speed lower than the cruising speed is set in the range in order to ensure that the blank is completely cut off);
2.4.1 presetting 3 proportional starting gun speeds under different cruising and cutting speed conditions, respectively carrying out 10 times of tests, measuring the width of a cutting seam and recording the cutting integrity;
2.4.2 the starting gun speed test process parameters comprise three key process parameters of edge preheating time, starting slot width and starting gun flying times.
And 3, step 3: setting an intelligent control system for the gun speed of the cutting machine based on a temperature measurement system;
3.1 arranging a group of infrared continuous temperature measuring devices on a frame of the cutting machine, wherein the infrared continuous temperature measuring devices are positioned on a width central line of the cutting machine and can accurately measure the central temperature of the plate blank at the position of the cutting machine in real time;
3.2 the temperature measurement data is accessed into a cutting machine PLC;
3.3 storing the gun speed control curve parameters of the plate blank flame cutting machine into a data block of the PLC according to the test regression data result in the step 2;
and 4, step 4: after a prepressing signal of the cutting machine is received, scanning once temperature measurement data with a period of 500 ms;
and 5: according to the temperature measurement data, outputting the corresponding cruise gun speed in a matching manner, and calling the corresponding starting gun speed according to the determined cruise gun speed;
step 6: and finishing the intelligent control process of the gun speed of the cutting machine.
Compared with the prior art, the method has the advantages that the gun speed of the cutting machine is dynamically adjusted in real time through online temperature detection, the problems that the surface temperature of the casting blank is greatly changed (600-1150 ℃), the casting blanks with different surface temperatures are subjected to flame cutting at a fixed gun speed, the casting blank is continuously cut at a low casting blank gun speed, the metal yield is low and the energy consumption is high due to the fact that the high-temperature casting blank gun speed is too slow to slit are solved. According to the method, in the experimental stage, the cutting quality of the plate blank is greatly improved, the cutting seam of the plate blank is reduced to 5mm from the original average 8mm, the metal cutting loss is reduced by 38%, the number of continuous cutting times per month is reduced by 90%, and the number of gun flying times is reduced by 95%.
Drawings
FIG. 1 is a fitted optimal casting blank surface temperature-cruise gun speed curve;
FIG. 2 is a flow chart of a cutting machine gun speed intelligent control method based on-line blank temperature detection.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1 and 2, an intelligent control method for the gun speed of a cutting machine based on online billet temperature detection comprises the following steps:
step 1: actually measuring the surface temperature distribution characteristics of the casting blank under different pulling speeds and different working conditions, wherein the surface temperature distribution characteristics of the casting blank are used as basic basis for setting the starting cutting speed and the cruising gun speed of the temperature cutting edge of the casting blank under different working conditions;
1.1 measuring the surface temperature of the casting blank at different pulling speed stages during normal production at a cutting origin;
1.2, the surface temperature of the casting blank under three different working conditions of stopping in the process of measuring and pouring at the cutting original point, quickly changing a tundish, casting a new tundish and the like;
1.3 measuring the temperature of two different points of the casting blank at the cutting origin by taking the center line of the casting blank as a reference according to the distance of 100mm-200 mm.
Step 2.: determining the cutting cruising gun speed of casting blanks with different blank temperatures;
2.1 determination of basic process data of cutting: cutting with oxygen pressure of 1.0-1.3MPa, oxygen flow rate of 300-450L/min, coal gas pressure of 0.7-0.9MPa, coal gas flow rate of 30-50L/min, and maximum cutting gun speed of 400-450 mm/min;
2.2 cruise gun speed test at different blank temperatures (different pulling speeds and typical working conditions). 3 testing gun speeds are preset under different working conditions and are respectively tested for 10 times, and the temperature of the center line of a casting blank, the width of a cutting seam, the length of molten steel and the cutting integrity are measured;
2.3, fitting an optimal casting blank surface temperature-cruise gun speed curve according to an actual measurement result;
2.4 determining the starting gun speed under the condition of different cruising gun speeds (the temperature gradients of the casting blanks with different surface temperatures in the width direction at the position above 100 away from the edge are small and are within 20 ℃, but the temperature is reduced by more than 50 ℃ in the range of 100mm away from the edge, and the cutting speed lower than the cruising speed is set in the range in order to ensure that the blank is completely cut off);
2.4.1 presetting 3 proportional starting gun speeds under different cruising and cutting speed conditions, respectively testing for 10 times, measuring the width of a cutting seam and recording the cutting integrity;
2.4.2 the starting gun speed test process parameters comprise three key process parameters of edge preheating time, starting slot width and starting gun flying times.
And 3, step 3: setting an intelligent control system for the gun speed of the cutting machine based on a temperature measurement system;
3.1 arranging a group of infrared continuous temperature measuring devices on a frame of the cutting machine, wherein the infrared continuous temperature measuring devices are positioned on a width central line of the cutting machine and can accurately measure the central temperature of the plate blank at the position of the cutting machine in real time;
3.2 the temperature measurement data is accessed into a cutting machine PLC;
3.3 storing the gun speed control curve parameters of the plate blank flame cutting machine into a data block of the PLC according to the test regression data result in the step 2.
And 4, step 4: after a prepressing signal of the cutting machine is received, scanning once temperature measurement data with a period of 500 ms;
and 5: and according to the temperature measurement data, matching and outputting the corresponding cruise gun speed, and calling the corresponding starting gun speed according to the determined cruise gun speed.
Step 6: and finishing the intelligent control process of the gun speed of the cutting machine.
The specific embodiment is as follows: referring to fig. 1-2, a certain factory adopts the coal oxygen flame to cut the plate blank, the maximum width of the plate blank is 1680mm, according to the technical scheme, the intelligent control method of the gun speed of the cutting machine based on the online plate blank temperature detection is adopted, and the specific implementation is as follows:
step 1: actually measuring the surface temperature distribution characteristics of the casting blank under different pulling speeds and different working conditions, wherein the surface temperature distribution characteristics of the casting blank are used as the basic basis for setting the starting cutting speed and the cruising gun speed of the cutting edge of the casting blank under different working conditions (see table 1)
1.1 measuring the surface temperature of the casting blank at different drawing speed stages in normal production at a cutting origin,
1.2 the surface temperature of the casting blank under three different working conditions of stopping in the process of measuring and pouring at the cutting origin, quickly changing a tundish, casting a new tundish and the like,
1.3 measuring the temperature of two different points of the casting blank at the cutting origin by taking the center line of the casting blank as a reference according to the distance of 100mm-200 mm.
TABLE 1 distribution characteristics of casting blank surface temperature under different pulling speeds and different working conditions
Step 2, determining the cutting cruising gun speed of different blank warm blanks (see table 2);
2.1 determination of basic process data of cutting: cutting with oxygen pressure of 1.2MPa, oxygen flow of 400L/min, coal gas pressure of 0.8MPa, coal gas flow of 40L/min, and maximum cutting gun speed of 420mm/min
2.2 cruise gun speed test at different blank temperatures (different pulling speeds and typical working conditions). 3 testing gun speeds are preset under different working conditions for 10 times of testing respectively, and the temperature of the central line of the casting blank, the width of a slot, the length of molten steel and the cutting integrity are measured.
TABLE (2) cruise gun speed test at different blank temperatures (different pull rates, typical conditions)
And 2.3, fitting an optimal casting blank surface temperature-cruise gun speed curve according to an actual measurement result. See fig. 1.
2.4 determination of starting gun speed under different cruising gun speeds (different surface temperature casting blank temperature gradient is small in the width direction at a position above 100 ℃ away from the edge, the temperature is within 20 ℃, but the temperature is reduced by more than 50 ℃ within 100mm away from the edge, and the cutting speed lower than the cruising speed is necessary within the range for ensuring the complete cutting of the casting blank)
And 2.4.1, respectively testing 10 times by presetting 3 proportional starting gun speeds under different cruising and cutting speed conditions, measuring the width of a cutting seam and recording the cutting integrity. (see Table 3)
Table 3 different cruise cut-off conditions preset 3 proportional starting gun speeds for 10 times of test records respectively
2.4.2 the starting gun speed test process parameters comprise three key process parameters of edge preheating time, starting slot width and starting gun flying times.
Step 3, setting an intelligent control system for the gun speed of the cutting machine based on a temperature measurement system;
3.1 set up a set of infrared continuous temperature measuring equipment on the cutting machine frame, the device is located the cutting machine central line, can be in real time accurate measurement cutting machine position slab central temperature.
3.2 the temperature measurement data is connected to the cutting machine PLC.
3.3 storing the gun speed control curve parameters of the plate blank flame cutting machine into a data block of the PLC according to the test regression data result in the step 2.
And 4, step 4: after the cutting machine prepressing signal is received, the temperature measurement data is scanned once by taking 500ms as a period.
And 5, matching and outputting the corresponding cruise gun speed according to the temperature measurement data, and calling the corresponding starting gun speed according to the determined cruise gun speed.
And 6, finishing the intelligent control process of the gun speed of the cutting machine.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (5)
1. An intelligent control method for the gun speed of a cutting machine based on-line blank temperature detection is characterized by comprising the following steps: step 1: actually measuring the surface temperature distribution characteristics of the casting blank under different pulling speeds and different working conditions, wherein the surface temperature distribution characteristics of the casting blank are used as basic basis for setting the starting cutting speed and the cruising gun speed of the temperature cutting edge of the casting blank under different working conditions;
step 2: determining the cutting cruise gun speed of casting blanks with different blank temperatures;
and step 3: setting an intelligent control system for the gun speed of the cutting machine based on a temperature measurement system;
and 4, step 4: after a prepressing signal of the cutting machine is received, scanning once temperature measurement data by taking 500ms as a period;
and 5: and according to the temperature measurement data, matching and outputting the corresponding cruise gun speed, and calling the corresponding starting gun speed according to the determined cruise gun speed.
Step 6: and finishing the intelligent control flow of the gun speed of the cutting machine.
2. The intelligent control method for the gun speed of the cutting machine based on the online billet temperature detection is characterized in that the step 1 specifically comprises the following steps:
1.1 measuring the surface temperature of the casting blank at different drawing speed stages in normal production at a cutting origin;
1.2, the surface temperature of the casting blank under three different working conditions of stopping in the process of measuring and pouring at the cutting original point, quickly changing a tundish, casting a new tundish and the like;
1.3 measuring the temperature of two different points of the casting blank at the cutting origin by taking the center line of the casting blank as a reference according to the distance of 100mm-200 mm.
3. The intelligent control method for the gun speed of the cutting machine based on the on-line blank temperature detection is characterized by comprising the following steps of 2.: the method comprises the following steps of determining the cruise gun speed for different blank temperature casting blanks:
2.1 determination of basic process data of cutting: cutting with oxygen pressure of 1.0-1.3MPa, oxygen flow rate of 300-450L/min, coal gas pressure of 0.7-0.9MPa, coal gas flow rate of 30-50L/min, and maximum cutting gun speed of 400-450 mm/min;
2.2 testing the cruise gun speeds of different billets, presetting 3 test gun speeds under different working conditions, respectively testing for 10 times, measuring the central line temperature of the casting blank, the width of a slot, the length of molten steel and observing the cutting integrity;
2.3 fitting an optimal casting blank surface temperature-cruise gun speed curve according to an actual measurement result;
and 2.4 determining the rifle starting speed under different cruising rifle speeds.
4. The intelligent control method for the gun speed of the cutting machine based on the on-line billet temperature detection is characterized in that in the step 2.4, the gun speed of the rifle is determined under the condition of different cruising gun speeds, specifically as follows,
2.4.1 presetting 3 proportional starting gun speeds under different cruising and cutting speed conditions, respectively carrying out 10 times of tests, measuring the width of a cutting seam and recording the cutting integrity;
2.4.2 the starting gun speed test process parameters comprise three key process parameters of edge preheating time, starting slot width and starting gun flying times.
5. The intelligent control method for the gun speed of the cutting machine based on the online billet temperature detection is characterized by comprising the following steps of 3: the intelligent control system setting of the cutting machine gun speed based on the temperature measurement system is as follows:
3.1 arranging a group of infrared continuous temperature measuring devices on a frame of the cutting machine, wherein the infrared continuous temperature measuring devices are positioned on a width central line of the cutting machine and can accurately measure the central temperature of the plate blank at the position of the cutting machine in real time;
3.2, connecting the temperature measurement data to a cutting machine PLC;
3.3 storing the gun speed control curve parameters of the plate blank flame cutting machine into a data block of the PLC according to the test regression data result in the step 2.
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