CN112548345A - Method for removing iron scale on surface of hot strip steel - Google Patents
Method for removing iron scale on surface of hot strip steel Download PDFInfo
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- CN112548345A CN112548345A CN202011365084.0A CN202011365084A CN112548345A CN 112548345 A CN112548345 A CN 112548345A CN 202011365084 A CN202011365084 A CN 202011365084A CN 112548345 A CN112548345 A CN 112548345A
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- laser
- strip steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
Abstract
The invention discloses a method for removing iron scale on the surface of hot strip steel, relates to the technical field of ferrous metallurgy, and particularly relates to a method for removing the iron scale on the surface of high-temperature strip steel by adopting laser. The method for removing the iron scale on the surface of the hot strip steel comprises the steps of removing the iron scale on the surface of the high-temperature thin strip steel by using laser dephosphorization equipment; after the high-temperature strip steel enters a hot rolling mill and passes through a light beam emitted by a laser emitter, the iron scale on the surface of the high-temperature strip steel absorbs the energy of laser, and the high-temperature strip steel is vaporized after the temperature is sharply increased or expands and peels off the surface of a hot strip steel matrix after being heated instantly. The technical scheme of the invention solves the problems that laser rust removal in the prior art can not be realized in a high-temperature environment, the surface temperature of a steel plate is reduced due to rust removal of a high-pressure water scale tank, the design of a tank body in an inert gas rust removal mode is complicated, the space is limited, the inert gas consumption is overlarge and the like.
Description
Technical Field
The invention discloses a method for removing iron scale on the surface of hot strip steel, relates to the technical field of ferrous metallurgy, and particularly relates to a method for removing the iron scale on the surface of high-temperature strip steel by adopting laser.
Background
At present, laser rust removal, high-pressure water scale tank rust removal and inert gas rust removal are generally adopted in the process of removing rust on the surface of a steel strip in the metallurgical industry.
The laser rust removal technology is widely applied at normal temperature and comprises the following steps: cleaning precision parts, aerospace components, military industry and nuclear power industry. The application of the existing laser rust removal technology is carried out at normal temperature, and light beams emitted by a laser are absorbed by iron oxide scales or a pollution layer on the surface of a workpiece to be processed, so that the iron oxide scales or the pollution layer on the surface of the workpiece are rapidly heated and expanded or vaporized to leave the workpiece.
The high-pressure water descaling box is used for descaling before a high-temperature steel plate enters a hot rolling mill, and the method is characterized in that high-pressure water sprayed by the high-pressure water descaling box is used for striking the surface of the high-temperature steel plate, and the water is rapidly heated to generate explosion. The scale on the surface of the high-temperature steel plate is peeled off by the striking force of high-pressure water and the explosive force after the water is heated.
The inert gas rust removal means that the high-temperature steel plate enters a box body filled with inert gas to isolate the contact of the high-temperature steel plate and oxygen in the air, and the scale is not produced any more
The three rust removing methods have the following defects in actual work:
1. the laser rust removal technology is suitable for false rust removal work under normal temperature conditions, but is not adopted in a high-temperature environment, and cannot meet the actual requirements of a site;
2. when the high-pressure water descaling box removes the iron scale on the surface of the high-temperature steel plate, the temperature of the high-temperature steel plate is reduced, the rolling temperature cannot be met, and the high-pressure water descaling box needs to be heated again.
3. The box body filled with inert gas can isolate the high-temperature steel plate from oxygen in the air, and has the problems of complex box body design, space limitation, large consumption of inert gas and the like.
Aiming at the problem that the three rust removing modes can not meet the requirement of removing the iron scale on the surface of the high-temperature thin steel plate, a novel method for removing the iron scale on the surface of the hot-strip steel is researched and designed, so that the problem existing in the prior art is very necessary to be solved.
Disclosure of Invention
According to the technical problems that laser rust removal can not be realized in a high-temperature environment, the temperature of the surface of a steel plate is reduced due to rust removal of a high-pressure water scale tank, the design of a tank body in an inert gas rust removal mode is complex, the space is limited, the consumption of inert gas is too large and the like, the method for removing the iron oxide scale on the surface of the hot strip steel is provided. The laser emitter is arranged in front of the rolling mill, and the laser emission power and the speed of matching the hot steel strip with the laser forest removal are determined through calculation, so that the aim of laser high-temperature rust removal is fulfilled.
The technical means adopted by the invention are as follows:
a method for removing the iron scale on the surface of hot strip steel is to remove the iron scale on the surface of high-temperature thin strip steel by laser dephosphorization equipment; after the high-temperature strip steel enters a hot rolling mill and passes through a light beam emitted by a laser emitter, the iron scale on the surface of the high-temperature strip steel absorbs the energy of laser, and the high-temperature strip steel is vaporized after the temperature is sharply increased or expands and peels off the surface of a hot strip steel matrix after being heated instantly.
Further, the method for removing the iron scale on the surface of the hot strip steel comprises the following steps:
A. the threshold values of the laser descaling reaction are respectively determined when the high temperature of the matrix and the scale of different steel grades is determined as follows: the reaction threshold of the steel type matrix is delta, and the reaction threshold of the iron scale is delta;
B. designing the laser energy density of the laser dephosphorization equipment, wherein the density is between delta and delta;
C. calculating the emission power of the laser, wherein the adopted calculation formula is as follows:
D. the matching speed of the hot strip steel and the laser descaling is calculated, and the adopted calculation formula is as follows:
E. inputting each parameter into a laser transmitter control system;
F. and removing the iron scale on the surface of the hot strip steel by adopting laser dephosphorization equipment.
Further, the formula:
t in (1) is the repetition period of the pulse; e is the average power of the laser transmitter; and r is the radius of a facula of laser pulses emitted by the laser emitter after vibration and reflection of the vibrating mirror and focusing of the field lens.
Further, peak power of the laser transmitter: e.T/T, where T is the single pulse width of the laser emitter.
Further, the formula:
eta in the step (a) is the overlapping rate of light spots of the laser emitter; l is the spot scan width.
Further, the laser dephosphorization equipment is arranged at the front end of the hot rolling mill and is used for removing surface iron oxide scales of the hot steel strip to be rolled;
further, the laser dephosphorization equipment comprises two laser transmitters, wherein the two laser transmitters are arranged at the upper part and the lower part of the hot steel strip at the front part of the inlet of the rolling mill; the laser emitter is connected with an external control system, and surface iron oxide scales on the upper surface and the lower surface of the hot strip steel are removed under the control of the control system.
The high-temperature rust removal mode of the invention is as follows: firstly, determining the threshold values of laser descaling reaction of different steel matrixes and iron scales at high temperature as delta and delta respectively. The densities of the oxide scales on the surfaces of the hot strip steel matrix and the hot strip steel matrix are different, and the density of the hot strip steel matrix is larger than that of the oxide scales on the surfaces, so that the absorption capacity of the oxide scales on the surfaces of the hot strip steel on laser is far larger than that of the hot strip steel matrix. The threshold values of laser descaling reaction of a tropical steel matrix and an iron scale of a certain steel at high temperature are measured to be delta and delta respectively, wherein delta is far smaller than delta.
The laser energy density of the laser descaling device is designed to be between delta and delta. The single pulse width of the laser is designed to be T, the repetition period of the pulse is T, the average power of the laser is determined to be e, and the radius of a light spot of the laser pulse emitted by the laser is r after the laser pulse is subjected to vibration and reflection of a vibrating mirror and focusing of a field lens. By the formula:
the power of the laser is determined. The laser spot overlapping rate is eta, the spot scanning width is l, and the laser spot overlapping rate is represented by the formula:
and (4) calculating the matching speed of the hot strip steel and the laser descaling.
Compared with the prior art, the invention has the following advantages:
1. the method for removing the iron scale on the surface of the hot strip steel can ensure that the hot strip steel has no temperature consumption in the procedure of removing the iron scale on the surface of the hot strip steel. When the high-pressure water descaling method is applied to high-temperature thin strip steel, the temperature drop of the strip steel is large;
2. the method for removing the oxide scales on the surface of the hot strip steel, provided by the invention, has the advantages that the proper laser power is designed, the moving speed of the hot strip steel is matched, the oxide scales on the surface of the hot strip steel can be effectively removed, and the hot strip steel matrix can not be damaged;
3. the method for removing the oxide scales on the surface of the hot strip steel is simple and reliable only by arranging the laser descaling machine at a point before the hot strip steel enters the hot rolling mill and protecting all paths of the hot strip steel entering the hot rolling mill compared with a box filled with inert gas.
In conclusion, the technical scheme of the invention solves the problems that laser rust removal in the prior art can not be realized in a high-temperature environment, the surface temperature of a steel plate is reduced due to rust removal of a high-pressure water scale tank, the tank body design of an inert gas rust removal mode is complicated, the space is limited, the inert gas consumption is overlarge and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of an assembly structure of the laser dephosphorization apparatus of the present invention.
In the figure: 1. a laser emitter 2, a rolling mill 3 and hot strip steel.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in the figure, the invention provides a method for removing the iron scale on the surface of hot strip steel, which is to remove the iron scale on the surface of high-temperature thin strip steel by laser dephosphorization equipment; after the high-temperature strip steel enters a hot rolling mill and passes through a light beam emitted by a laser emitter, the iron scale on the surface of the high-temperature strip steel absorbs the energy of laser, and the high-temperature strip steel is vaporized after the temperature is sharply increased or expands and peels off the surface of a hot strip steel matrix after being heated instantly.
The method for removing the iron scale on the surface of the hot strip steel comprises the following steps:
A. the threshold values of the laser descaling reaction are respectively determined when the high temperature of the matrix and the scale of different steel grades is determined as follows: the reaction threshold of the steel type matrix is delta, and the reaction threshold of the iron scale is delta;
B. designing the laser energy density of the laser dephosphorization equipment, wherein the density is between delta and delta;
C. calculating the emission power of the laser, wherein the adopted calculation formula is as follows:
D. the matching speed of the hot strip steel and the laser descaling is calculated, and the adopted calculation formula is as follows:
E. inputting each parameter into a laser transmitter control system;
F. and removing the iron scale on the surface of the hot strip steel by adopting laser dephosphorization equipment.
The formula:
t in (1) is the repetition period of the pulse; e is the average power of the laser transmitter; and r is the radius of a facula of laser pulses emitted by the laser emitter after vibration and reflection of the vibrating mirror and focusing of the field lens.
Peak power of laser emitter: e.T/T, where T is the single pulse width of the laser emitter.
The formula:
eta in the step (a) is the overlapping rate of light spots of the laser emitter; l is the spot scan width.
The laser dephosphorization equipment is arranged at the front end of the hot rolling mill 3 and is used for removing surface iron oxide scales of the hot steel strip 3 to be rolled; the laser dephosphorization equipment comprises two laser transmitters 1, wherein the two laser transmitters 1 are arranged at the upper part and the lower part of a hot steel strip 3 at the front part of an inlet of a rolling mill 2; the laser emitter 1 is connected with an external control system, and removes surface iron oxide scales on the upper and lower surfaces of the hot strip steel 3 under the control of the control system.
Example 1
The invention provides a method for removing iron oxide scales on the surface of hot strip steel, which comprises the following steps:
the threshold value required for detecting and obtaining the oxide scale on the surface of certain hot strip steel by adopting laser to remove is 0.6J/cm2The reaction threshold of the tropical steel matrix is 450J/cm2。
The repetition period T of the laser pulse is 1x10-5s; the radius r of a laser spot of laser pulses emitted by the laser emitter is 0.5mm after the laser pulses are vibrated and reflected by the vibrating mirror and focused by the field lens.
By the formula
The minimum average power of the laser emitter was determined to be 471W, and the average power was determined to be 500W based on the usual power of a pulsed laser.
The diameter of a single light spot is 1mm, the designed light spot scanning width is 100mm, the light spot overlapping rate of the laser emitter is 20%, and the number of the required light spots in the scanning width is 125. The number of pulses emitted within a laser pulse 1s is 105And determining the length of the scanning within 1s to be 800mm, namely, the running speed of the hot strip steel is 0.8 m/s.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for removing the iron scale on the surface of hot strip steel is characterized in that the method for removing the iron scale on the surface of the hot strip steel is to remove the iron scale on the surface of the high-temperature thin strip steel by laser dephosphorization equipment; after the high-temperature strip steel enters a hot rolling mill and passes through a light beam emitted by a laser emitter, the iron scale on the surface of the high-temperature strip steel absorbs the energy of laser, and the high-temperature strip steel is vaporized after the temperature is sharply increased or expands and peels off the surface of a hot strip steel matrix after being heated instantly.
2. The method for removing the scale on the surface of the hot strip steel as claimed in claim 1, wherein the method for removing the scale on the surface of the hot strip steel comprises the steps of:
A. the threshold values of the laser descaling reaction are respectively determined when the high temperature of the matrix and the scale of different steel grades is determined as follows: the reaction threshold of the steel type matrix is delta, and the reaction threshold of the iron scale is delta;
B. designing the laser energy density of the laser dephosphorization equipment, wherein the density is between delta and delta;
C. calculating the emission power of the laser, wherein the adopted calculation formula is as follows:
D. the matching speed of the hot strip steel and the laser descaling is calculated, and the adopted calculation formula is as follows:
E. inputting each parameter into a laser transmitter control system;
F. and removing the iron scale on the surface of the hot strip steel by adopting laser dephosphorization equipment.
3. The method for removing the scale on the surface of the hot strip steel as claimed in claim 2, wherein the formula is as follows:
t in (1) is the repetition period of the pulse; e is the average power of the laser transmitter; and r is the radius of a facula of laser pulses emitted by the laser emitter after vibration and reflection of the vibrating mirror and focusing of the field lens.
4. The method for removing the scale on the surface of the hot strip steel as claimed in claim 3, wherein the peak power of the laser emitter is as follows: e.T/T, where T is the single pulse width of the laser emitter.
5. The method for removing the scale on the surface of the hot strip steel as claimed in claim 2, wherein the formula is as follows:
eta in the step (a) is the overlapping rate of light spots of the laser emitter; l is the spot scan width.
6. The method for removing the surface iron oxide scale of the hot strip steel according to claim 2, wherein the laser dephosphorization equipment is arranged at the front end of the hot rolling mill (3) and is used for removing the surface iron oxide scale of the hot strip steel (3) to be rolled;
the laser dephosphorization equipment comprises two laser transmitters (1), wherein the two laser transmitters (1) are arranged at the upper part and the lower part of a hot steel strip (3) at the front part of an inlet of the rolling mill (2); the laser emitter (1) is connected with an external control system, and surface iron oxide scales of the upper surface and the lower surface of the hot strip steel (3) are removed under the control of the control system.
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| CN202011365084.0A CN112548345A (en) | 2020-11-27 | 2020-11-27 | Method for removing iron scale on surface of hot strip steel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1224644A (en) * | 1996-08-12 | 1999-08-04 | 阿姆科公司 | Descaling metal with laser having very short pulse width and high average power |
| CN105170665A (en) * | 2015-08-26 | 2015-12-23 | 武汉钢铁(集团)公司 | Method for removing iron oxide scale from surface of strip steel efficiently |
| CN107186345A (en) * | 2017-06-15 | 2017-09-22 | 上海应用技术大学 | Hot-strip substitutes the laser rust-removing device of pickling in rolling |
| TWM557160U (en) * | 2017-10-30 | 2018-03-21 | China Steel Corp | Band steel deburring machine |
| CN210816750U (en) * | 2019-03-22 | 2020-06-23 | 纽敦光电科技（上海）有限公司 | Equipment for cleaning oxide layer on surface of hot rolled steel plate |
-
2020
- 2020-11-27 CN CN202011365084.0A patent/CN112548345A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1224644A (en) * | 1996-08-12 | 1999-08-04 | 阿姆科公司 | Descaling metal with laser having very short pulse width and high average power |
| CN105170665A (en) * | 2015-08-26 | 2015-12-23 | 武汉钢铁(集团)公司 | Method for removing iron oxide scale from surface of strip steel efficiently |
| CN107186345A (en) * | 2017-06-15 | 2017-09-22 | 上海应用技术大学 | Hot-strip substitutes the laser rust-removing device of pickling in rolling |
| TWM557160U (en) * | 2017-10-30 | 2018-03-21 | China Steel Corp | Band steel deburring machine |
| CN210816750U (en) * | 2019-03-22 | 2020-06-23 | 纽敦光电科技（上海）有限公司 | Equipment for cleaning oxide layer on surface of hot rolled steel plate |
Non-Patent Citations (1)
| Title |
|---|
| 康永林等: "《轧制工程学 第2版》", 30 September 2014, 北京冶金工业出版社 * |
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