CN114277243B - Roller laser line facula alloying method - Google Patents
Roller laser line facula alloying method Download PDFInfo
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- CN114277243B CN114277243B CN202111646059.4A CN202111646059A CN114277243B CN 114277243 B CN114277243 B CN 114277243B CN 202111646059 A CN202111646059 A CN 202111646059A CN 114277243 B CN114277243 B CN 114277243B
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- 238000005275 alloying Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 238000005299 abrasion Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 238000005728 strengthening Methods 0.000 abstract description 3
- 230000000007 visual effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to the technical field of laser surface strengthening, in particular to a roller laser line light spot alloying method. The roll laser line facula alloying method adopts a linear facula optical head to scan the groove surface of the roll along the circumferential direction of the roll; and adjusting alloying parameters of the light spots on the groove surface according to the position information of the groove surface. The laser alloying of the linear light spots is adopted to reduce or eliminate the lap joint belt along the circumferential direction, the uniformity of the alloying layer in all directions is good, and the surface flatness is high. Because no or few circumferential lap belts exist, the friction resistance of the roller grooves along the bus direction in the rolling process is reduced, and the wear resistance and the dimensional accuracy of the roller are improved; the high-power laser and long-line light spot improve the alloying processing efficiency, and the process method is simple, convenient, visual and high in operability.
Description
Technical Field
The invention relates to the technical field of laser surface strengthening, in particular to a roller laser line light spot alloying method.
Background
Laser surface alloying is simply called laser alloying. Laser alloying is a process method for rapidly melting, solidifying and forming new alloy substances on the surface of a material by the thermal effect of the interaction of laser and solid phase substances so as to change the physical and chemical properties of the material. The technology is characterized in that alloying of various alloy elements can be carried out on the surface of the material, the performance of the surface of the material is improved, and local treatment can be carried out on the part of the part needing strengthening. In the steel industry, the quality and the service life of the roller are directly related to the efficiency of rolling production, the product quality and the production cost, and the improvement of the wear resistance of the roller has economic and social benefits.
Laser alloyed roll grooves typically employ a focal circle spot diameter of 1-2mm or less. The small light spot laser alloying surface is smooth, but because the densely distributed lap belts are easy to generate cracks, the wear-resistant effect is reduced, and the circumferential lap belts are perpendicular to the bus in the rolling process, so that the rolling resistance along the bus direction is increased, and the wear is increased; because laser spot light spot alloying processing laser power is low (generally less than 4000 w), processing efficiency is low, and the processing efficiency is particularly outstanding when processing rolls for rolling middle section bars and large section bars, because the rolls for the middle section bars and the large section bars generally have larger grooves.
Disclosure of Invention
A first object of the present invention is to provide a roll laser line spot alloying method, which can solve the problems existing in the prior art;
the invention provides a roller laser line facula alloying method, which adopts a linear facula optical head to scan the groove surface of a roller along the circumferential direction of the roller;
and adjusting alloying parameters of the light spots on the groove surface according to the position information of the groove surface.
Preferably, the position information of the groove surface position comprises abrasion information of the groove surface and inclination angle information of the groove surface relative to the roller axis, and length information of the groove surface;
the difference of inclination angles of the groove surfaces relative to the axes of the rollers is divided into cylindrical surfaces and conical surfaces.
Preferably, when the groove surface is a cylindrical surface, the linear light spots are overlapped with generatrix of the cylindrical surface.
Preferably, when the groove surface is a conical surface, the linear light spots are overlapped with the generatrix of the conical surface, and the power density of the laser irradiation of each point on the generatrix is adjusted to ensure that the alloying effect of each point on the generatrix is consistent.
Preferably, changing the power density of the laser irradiation of each point on the bus comprises adjusting the position of the optical head to enable the focal plane to have an included angle a with the tangent plane of the bus, and the power density is gradually reduced as the light spot width gradually increases in a linear relation due to the gradual increase of the light spot defocusing amount from top to bottom on the roller surface.
Preferably, the linear light spot width is not more than 1mm, and the power of the laser is determined according to different roller base materials.
Preferably, the roll surface is divided into a plurality of sections, and the sections are subjected to laser scanning.
Preferably, a helical scan is used when the linear spot length is less than 10 mm.
Preferably, the roll surface includes an easily abradable region, and the alloying parameters are adjusted to strengthen the alloying layer at the circumference of the easily abradable region.
Preferably, the initial position of the line spot is adjusted so that its center line does not coincide with the bus bar.
Preferably, the roller comprises a guide plate and a wear plate, and the guide plate and the wear plate are alloyed by laser lines.
The beneficial effects are that:
the laser alloying of the linear light spots is adopted to reduce or eliminate the lap joint belt along the circumferential direction, the uniformity of the alloying layer in all directions is good, and the surface flatness is high. Because no or few circumferential lap belts exist, the friction resistance of the roller grooves along the bus direction in the rolling process is reduced, and the wear resistance and the dimensional accuracy of the roller are improved; the high-power laser and long-line light spot improve the alloying processing efficiency, and the process method is simple, convenient, visual and high in operability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a linear light spot alloying cylinder according to an embodiment of the present invention;
FIG. 2 is a schematic view of a linear light spot alloying conical surface according to an embodiment of the present invention;
FIG. 3 is a schematic view of cone alloying with angle adjustment according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a scanning mode in which a line light spot and a bus have a certain included angle according to an embodiment of the present invention;
FIG. 5 is a schematic view of determining an angle a by using an irradiation bevel method according to an embodiment of the present invention;
FIG. 6 is a schematic view of an angle a adjustment by a roll groove according to an embodiment of the present invention
Fig. 7 is a schematic view of a roll groove according to an embodiment of the present invention.
Reference numerals illustrate:
1: a laser head; 2. 3 respectively represent the laser focusing beam and the light spot of the focusing beam on the rolling groove; r and R are respectively the radius of a big circle and a small circle at two ends of the rolling groove; omega is the rotation angular velocity of the roller; f is the focal length.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The embodiment provides a roller laser line light spot alloying method, which adopts a linear light spot optical head to scan the groove surface of a roller along the circumferential direction of the roller. And adjusting alloying parameters of the light spots on the groove surface according to the position information of the groove surface.
In the embodiment, the laser alloying of the linear light spots is reduced or no lap joint belt along the circumferential direction is adopted, the uniformity of the alloying layer in all directions is good, and the surface flatness is high. Because no or few circumferential lap belts exist, the friction resistance of the roller grooves along the bus direction in the rolling process is reduced, and the wear resistance and the dimensional accuracy of the roller are improved; the high-power laser and long-line light spot improve the alloying processing efficiency, and the process method is simple, convenient, visual and high in operability.
In the embodiment, the roller is processed by adopting the high-power laser wiring type light spot optical head, for example, 10000w high-power laser wiring type light spot optical head is adopted, the light spot size (width x length) is minimum 0.2 x 4mm, and the maximum 1.0 x 135mm linear light spot scans the groove surface of the roller of the section bar and the large section bar in alloying processing, and the roller is particularly suitable for processing the cylindrical surface and the conical surface of the roller.
Specifically, the linear light spot width is not more than 1mm, and meanwhile, the proper power is determined according to different matrix materials so as to prevent uneven processing surface caused by molten metal flowing in the alloying process.
The position information of the groove surface position comprises abrasion information of the groove surface and inclination angle information of the groove surface relative to a roller axis, and length information of the groove surface.
The difference of inclination angles of the groove surfaces relative to the axes of the rollers is divided into cylindrical surfaces and conical surfaces.
When the groove surface is a cylindrical surface, the linear light spots are overlapped with the generatrix of the cylindrical surface. As shown in figure 1, the power density of the bus irradiated by the laser is equal everywhere, the linear speed of the laser scanning is equal everywhere, the whole cylindrical surface is only overlapped at the starting position and the ending position, and the quality consistency of the processing surface is good.
When the groove surface is a conical surface, the linear light spots are overlapped with the generatrix of the conical surface, and the power density of the stimulated light irradiation of each point on the generatrix is adjusted to enable the alloying effect of each point on the generatrix to be consistent.
Changing the power density of the laser irradiation of each point on the bus comprises adjusting the position of the optical head to enable the focal plane to form an included angle a with the tangent plane of the bus, and the power density is gradually reduced as the light spot width of the light spot on the roll surface gradually increases from top to bottom and the light spot width gradually increases in a linear relation.
As shown in fig. 2, the power densities of the laser irradiation on the conical surface bus are equal everywhere, but the linear speeds of the laser scanning of each point on the bus gradually decrease from top to bottom in a linear relationship, the linear speed of the upper end is the largest, and the linear speed of the lower end is the smallest, which is the main reason for causing the alloyed layer to gradually deepen from top to bottom and flow. The difference of the linear speeds of the laser scans of the points on the bus bar is unchangeable, but the power density of the laser irradiation of the points on the bus bar can be changed, and the power density usually determines whether a threshold value of melting, ablation or other actions is reached when the laser acts on the material, so that the power density of the laser irradiation of the points on the bus bar can be reduced to reduce the alloying depth. The specific method is that the position of the optical head is adjusted to lead the focal plane to have an included angle a with the tangential plane of the bus, as shown in figure 3, the width of the light spot gradually increases in a linear relation due to the gradual increase of the defocusing amount from top to bottom on the roll surface, the power density gradually decreases, the power density and the scanning speed are main factors influencing the alloying depth, and the proper angle a is determined to lead the alloying effect of each point on the bus to be consistent.
The roll surface is divided into a plurality of sections, and laser scanning is carried out on the roll surface in sections. For example, for the alloying of the conical surface with longer bus by using shorter linear light spots in a sectional scanning way, the number of times of scanning lap joint can be reduced, the same linear speed is taken from the light spots in each section during scanning, and the quality deviation of the alloying layers in each section is reduced.
The roller surface comprises an easy-abrasion area, and the alloying parameters are adjusted on the circumference of the easy-abrasion area to strengthen the alloying layer. Specifically, the groove surface abrasion is a circumferential belt in the use process of the roller, and the alloying parameters are adjusted to strengthen the alloying layer on the circumferential belt with severe groove surface abrasion, which is expected by a shorter linear light spot sectional scanning alloying method, so that the overall service life of the roller can be prolonged.
Determining an included angle a between a laser focal plane and a bus tangent plane, and irradiating an inclined plane by using the method shown in figure 5; or the angle a is regulated by depending on a roller groove, and the specific method is to tangential adjust the optical head between the steel plate and the conical surface bus of laser irradiation as shown in figure 6. And after laser irradiation for a certain time, determining an angle a by observing the surface of the detection light spot and the metallographic phase of the section.
The starting position of the line spot is adjusted so that the center line does not coincide with the bus bar to avoid starting and ending lap joints at the bus bar position as shown in fig. 4, to reduce lap belt wear. This method also increases the resistance to flow of the cone alloyed molten metal.
When the length of the linear light spot is less than 10mm, the spiral scanning mode is adopted, so that the laser stop times can be reduced.
The roller comprises the guide plate and the wear-resistant plate, and the guide plate and the wear-resistant plate are alloyed by laser light spots, so that the alloying processing efficiency is improved, and the alloying quality is remarkably improved because no lap joint belt is arranged.
In order to further explain the roller laser line facula alloying method, the embodiment also provides a specific use process of the method, which is specifically shown as follows:
10000w semiconductor laser, custom laser OTS-5 semiconductor optical fiber transmission laser head, linear light spot size (length. Width) 10 x 0.8mm, collimated beam diameter 35.64mm, focal length f=500 mm. As shown in fig. 7, the angle steel roll with the length of 100 x 10 is about 100mm, r=172 mm and r=246 mm. The bus is divided into 10 sections from top to bottom, each section has the length of 10mm, alloying processing parameters are as follows, the optical axis passes through the section to form a focal length of 500mm, the scanning linear speed Vi at the midpoint and the corresponding roller rotating speeds ωi (i=1, 2, 3, 4, 5, 6, 7, 8, 9 and 10) are set to ensure that vi=6000 mm/min is unchanged by setting the corresponding ωi of each section, and the laser power is 9800w. And (3) comparing with a conventional spot light spot alloying process: the power is 1000 watts, the focal length is 300, the light spot is not more than 1mm, the spiral scanning line speed is 6 m/min, the lap joint amount between the scanning bands is 0.1-0.2mm, one lap joint band is calculated according to one scanning circle, and more than 100 lap joint bands are alloyed on each conical surface. The linear light spot roller alloying efficiency is about 10 times that of the point light spot roller alloying, and each conical surface lap joint belt is only 9.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. A roll laser line facula alloying method is characterized in that a linear facula optical head is adopted to scan the groove surface of a roll along the circumferential direction of the roll;
adjusting alloying parameters of the facula to the groove surface according to the position information of the groove surface;
the position information of the groove surface position comprises abrasion information of the groove surface and inclination angle information of the groove surface relative to the roller axis, and length information of the groove surface;
the difference of inclination angles of the groove surfaces relative to the axes of the rollers is divided into cylindrical surfaces and conical surfaces;
when the groove surface is a cylindrical surface, the linear light spots are overlapped with the generatrix of the cylindrical surface;
when the groove surface is a conical surface, the linear light spots are overlapped with the conical surface bus, and the power density of each point on the bus irradiated by the laser is adjusted to enable the alloying effect of each point on the bus to be consistent;
changing the power density of the laser irradiation of each point on the bus comprises adjusting the position of the optical head to enable the focal plane to form an included angle a with the tangent plane of the bus, and the power density is gradually reduced as the light spot width of the light spot on the roll surface gradually increases from top to bottom and the light spot width gradually increases in a linear relation.
2. The method of claim 1, wherein the laser beam spot width of the roll is not greater than 1mm, and the laser power is determined based on the roll matrix material.
3. The method of claim 1, wherein the roll surface is divided into segments, and the segments are scanned by laser.
4. The roll laser line spot alloying method of claim 1, wherein the roll surface comprises an easily abradable region, and the alloying parameters are adjusted to strengthen the alloying layer at the circumference of the easily abradable region.
5. The method of alloying roll laser beam spots according to claim 1, wherein the initial position of the beam spot is adjusted so that the center line thereof does not coincide with the bus bar;
when the length of the linear light spot is less than 10mm, the spiral scanning mode is adopted, so that the laser stop times can be reduced.
6. The method of claim 1, wherein the mill roll includes a guide plate and a wear plate, and the guide plate and wear plate are alloyed with the laser beam spot.
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| CN202111646059.4A CN114277243B (en) | 2021-12-30 | 2021-12-30 | Roller laser line facula alloying method |
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| CN202111646059.4A CN114277243B (en) | 2021-12-30 | 2021-12-30 | Roller laser line facula alloying method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392021A (en) * | 2001-06-15 | 2003-01-22 | 沈阳大陆激光技术有限公司 | Laser repairing process for failed gas compressor rotor |
| CN101392649A (en) * | 2008-08-05 | 2009-03-25 | 山东泰山建能机械集团有限公司 | Antiwear laser strengthened pick and its processing method |
| CN106337179A (en) * | 2015-07-07 | 2017-01-18 | 武汉点金激光科技有限公司 | Laser surface alloying treatment process for heating furnace hearth roll collar |
| CN107201427A (en) * | 2017-05-05 | 2017-09-26 | 吉林大学 | Laser transformation strengthening method and the bionical camshaft that hard phase is prepared using this method |
| CN112159885A (en) * | 2020-09-01 | 2021-01-01 | 江苏徐工工程机械研究院有限公司 | Surface hardening method for low-carbon steel |
-
2021
- 2021-12-30 CN CN202111646059.4A patent/CN114277243B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392021A (en) * | 2001-06-15 | 2003-01-22 | 沈阳大陆激光技术有限公司 | Laser repairing process for failed gas compressor rotor |
| CN101392649A (en) * | 2008-08-05 | 2009-03-25 | 山东泰山建能机械集团有限公司 | Antiwear laser strengthened pick and its processing method |
| CN106337179A (en) * | 2015-07-07 | 2017-01-18 | 武汉点金激光科技有限公司 | Laser surface alloying treatment process for heating furnace hearth roll collar |
| CN107201427A (en) * | 2017-05-05 | 2017-09-26 | 吉林大学 | Laser transformation strengthening method and the bionical camshaft that hard phase is prepared using this method |
| CN112159885A (en) * | 2020-09-01 | 2021-01-01 | 江苏徐工工程机械研究院有限公司 | Surface hardening method for low-carbon steel |
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