CN114952009A - Vacuum laser remelting surface modification method - Google Patents
Vacuum laser remelting surface modification method Download PDFInfo
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- CN114952009A CN114952009A CN202210404698.8A CN202210404698A CN114952009A CN 114952009 A CN114952009 A CN 114952009A CN 202210404698 A CN202210404698 A CN 202210404698A CN 114952009 A CN114952009 A CN 114952009A
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- 238000002715 modification method Methods 0.000 title claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 46
- 230000004048 modification Effects 0.000 claims abstract description 28
- 238000012986 modification Methods 0.000 claims abstract description 28
- 229910000838 Al alloy Inorganic materials 0.000 claims description 20
- 238000003466 welding Methods 0.000 claims description 14
- 239000011261 inert gas Substances 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 2
- 238000004372 laser cladding Methods 0.000 claims description 2
- 238000005554 pickling Methods 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 26
- 229910052751 metal Inorganic materials 0.000 abstract description 16
- 239000002184 metal Substances 0.000 abstract description 16
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- 230000007547 defect Effects 0.000 abstract description 6
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- 238000002474 experimental method Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 238000002844 melting Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910001093 Zr alloy Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
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- 238000009835 boiling Methods 0.000 description 2
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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
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/354—Working by laser beam, e.g. welding, cutting or boring for surface treatment by melting
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
A vacuum laser remelting surface modification method belongs to the field of metal surface modification. The invention aims to solve the problems that the existing remelting method cannot simultaneously solve the problems of more pore defects, large and thick crystal grains, poor forming, large-size remelting area which cannot be realized by single processing and difficulty in controlling the bottom surface profile radian. The method comprises the following steps: firstly, placing, clamping and laser adjusting; secondly, laser remelting; and thirdly, taking out the workpiece. The invention is used for vacuum laser remelting surface modification.
Description
Technical Field
The invention belongs to the field of metal surface modification.
Background
Piston cylinders are very important parts in engines, and surface stress parts of the piston cylinders are subjected to more frequent load bearing and abrasion in the using process, so that local positions on the surfaces of the pistons are generally required to be subjected to surface remelting and other processes to achieve higher service performance, such as better abrasion resistance and corrosion resistance, compared with the whole piston surface. However, the traditional surface remelting modification method still hardly avoids the problem of pores in the remelted part, so that the performance can not reach the use standard. Meanwhile, the remelting size required by the piston cylinder is large in area (the width is larger than or equal to 12mm, the depth is larger than or equal to 8mm), the remelting size cannot be completed through one-time processing in the traditional process, the radian of the bottom surface profile is difficult to control, and the difficulty of batch production is increased. At present, the remelting modification method of the metal surface is carried out in a normal pressure environment, and electric arcs or lasers are mostly used as heat sources.
Chinese patent CN106825581B discloses a method and apparatus for remelting metal surface, which is characterized in that a processing unit drives a heat source output member to move according to the path information in the path planning stage, and simultaneously, the relative position between the heat source output member and the point to be processed of the metal part is adjusted in time according to the normal of the point to be processed, so that the included angle between the heat source and the processing surface is not more than 45 °. The method designs a device for adjusting the remelting angle and direction, improves the remelting efficiency, but the method does not describe a specific remelting process and cannot fundamentally improve the remelting quality and size. Chinese patent CN108453344A discloses a device and method for remelting the outer circle surface of a circular ring workpiece, which is characterized in that the argon arc remelting equipment has simple and smart structure and hydrogen protection, and can prevent the surface of the workpiece from being oxidized during remelting. Therefore, it is not suitable for some applications with special remelting quality requirements.
The prior technical scheme is a new method for improving remelting equipment, improving remelting efficiency and improving the binding force of a cladding layer and a substrate, and cannot simultaneously solve the problems of low efficiency, large crystal grains, poor forming, incapability of realizing a large-size remelting area through single processing and difficulty in controlling the bottom surface profile radian.
Disclosure of Invention
The invention aims to solve the problems that the existing remelting method cannot simultaneously solve the problems of many pore defects, large crystal grains, poor forming, large-size remelting area which cannot be realized by single processing and difficulty in controlling the bottom profile radian, and further provides a vacuum laser remelting surface modification method.
A vacuum laser remelting surface modification method is carried out according to the following steps:
firstly, placing, clamping and laser adjusting:
placing the preprocessed workpiece to be processed in a vacuum cabin, clamping and fixing the workpiece, and then adjusting the swing mode of the output light spot of the laser, the position of a laser processing head and the welding path of the laser processing head;
secondly, laser remelting:
vacuumizing a vacuum chamber, introducing inert gas, and carrying out vacuum laser remelting surface modification under the conditions that the laser processing speed is 0.1-12 m/min, the laser power is 0.5-50 kW, the defocusing amount is-30 mm, the swinging amplitude is 0.2-12 mm and the swinging frequency is 10-1000 Hz until a light spot walking track covers the whole pre-remelting area;
thirdly, taking out the workpiece:
after laser remelting, keeping the pressure in the vacuum chamber, stopping introducing inert gas and vacuumizing, opening the air inlet valve until the pressure in the chamber reaches the atmospheric pressure, and taking out the workpiece to finish the vacuum laser remelting surface modification method.
The invention has the beneficial effects that:
1. the invention cleans the surface to be processed before processing, ensures the cleanliness of the processed surface and reduces the probability of defects caused by surface stains, oxide layers and other factors. External equipment such as an assembling clamp, a vacuum chamber, a travelling mechanism and the like can be flexibly selected according to specific conditions such as specific machined workpiece size, machined workpiece structure, machining track and the like, and surface modification of a complex structural part can be realized.
2. The invention controls the vacuum degree to reach the threshold value required by laser welding, keeps the vacuum degree below 1000Pa according to the research result, and is carried out in a vacuum environment, thereby effectively inhibiting the generation of pores, reducing the oxygen content in the environment, and inhibiting the oxidation reaction of metals, particularly the oxidation of the surfaces of welding seams by using lower environmental pressure for some metals which are sensitive to oxygen, such as zirconium alloy and the like. Meanwhile, the vacuum environment inhibits plasma plume and metal splashing in the processing process, so that laser energy is stably absorbed by metal, the processing depth of a remelting area is improved, and the laser remelting processing size range is enlarged by matching with swinging laser (the remelting section can reach 12mm in width and 8mm in depth). And the vacuum environment and the swing laser can enlarge the remelting area and control the section shape to be similar to a semicircular section at the same time. Therefore, the forming is good and the efficiency is high, the problems that the existing splashing is large, the number of air holes is large, and the bottom surface profile radian is difficult to control are solved, and the problem that the transmission method cannot meet the requirements of wide and deep remelting size through single processing is solved. The reduction of the environmental pressure can cause the change of basic properties of the material, including the reduction of a boiling point, the increase of recoil pressure and the change of a heat conduction mode, finally causes the reduction of the temperature gradient in the solidification process of a molten pool, the grain size and the grain shape are improved, the weld joint tissue is more prone to isometric crystal growth while the grain size is reduced, the isometric crystal proportion is increased, and the mechanical property and the wear resistance are improved while the grain size is reduced and the isometric crystal proportion is increased.
3. The invention adopts laser as a heat source to carry out metal remelting surface modification. The laser has the advantages that the light source has various forms, the light beam can be subjected to energy field tuning by adjusting various parameters, and the degree of freedom for processing a complex structure is higher and more flexible. The technological parameters of the vacuum laser surface modification mainly comprise processing speed, laser power, defocusing amount, swing amplitude, swing frequency, light spot swing mode and the like. The selection of the parameters needs to be according to the shape and the size of a remelted layer of the actual workpiece to be processed; for example, lasers with different wavelengths can be selected according to the absorptivity of different materials to the lasers for more targeted processing; if the swing mode or defocusing amount of the laser can be designed according to the shape requirement of the remelted layer, the laser power, the processing speed, the swing amplitude and the like can be adjusted according to the size of the remelted layer; such as by oscillating a laser or otherwise adjusting the temperature field to affect the structure and size of the tissue, as desired for the structure or size of the tissue. This makes it possible to produce a surface-modified layer having the required dimensional and shape properties. Compared with the traditional electric arc remelting method, the method has higher efficiency and stronger controllability. Compared with the normal pressure laser remelting surface modification, the remelting quality is higher, and the defects are fewer. Compared with electron beam surface modification, the surface modification method has lower cost and higher processing freedom.
Drawings
FIG. 1 is a cross-sectional metallographic view of a laser-remelted surface-modified aluminum alloy piston cylinder prepared in comparative experiments (a) and a vacuum-laser-remelted surface-modified aluminum alloy piston cylinder prepared in example one (b);
FIG. 2 is a microstructure morphology of a remelting area after remelting surface modification, (a) is a top structure morphology of a melting area of an aluminum alloy piston cylinder after atmospheric laser remelting surface modification prepared by a comparative experiment; (b) the structure appearance of the bottom of the melting zone of the normal-pressure laser remelting surface-modified aluminum alloy piston cylinder prepared by a comparative experiment is shown; (c) the structure appearance of the top of the melting zone of the aluminum alloy piston cylinder body after the vacuum laser remelting surface modification prepared in the first embodiment is obtained; (d) the structure appearance of the bottom of the melting zone of the aluminum alloy piston cylinder body after the vacuum laser remelting surface modification is prepared in the first embodiment.
Detailed Description
The first specific implementation way is as follows: the embodiment provides a vacuum laser remelting surface modification method, which is carried out according to the following steps:
firstly, placing, clamping and laser adjusting:
placing the preprocessed workpiece to be processed in a vacuum cabin, clamping and fixing the workpiece, and then adjusting the swing mode of the output light spot of the laser, the position of a laser processing head and the welding path of the laser processing head;
secondly, laser remelting:
vacuumizing a vacuum chamber, introducing inert gas, and carrying out vacuum laser remelting surface modification under the conditions that the laser processing speed is 0.1-12 m/min, the laser power is 0.5-50 kW, the defocusing amount is-30 mm, the swinging amplitude is 0.2-12 mm and the swinging frequency is 10-1000 Hz until a light spot walking track covers the whole pre-remelting area;
thirdly, taking out the workpiece:
after laser remelting, keeping the pressure in the vacuum chamber, stopping introducing inert gas and vacuumizing, opening the air inlet valve until the pressure in the chamber reaches the atmospheric pressure, and taking out the workpiece to finish the vacuum laser remelting surface modification method.
After remelting is completed, the pressure in the vacuum chamber is kept for a period of time, so that the high-temperature laser remelting surface is prevented from reacting with air rapidly, the pressure keeping time is determined according to conditions of processing materials, and especially certain nonferrous metals which are very sensitive to oxygen can cause oxidative discoloration due to too early air filling.
The material of the embodiment can absorb laser, the size is suitable for the size of the vacuum chamber, the vacuum chamber is not too large or too small, the structure is not limited to a flat plate, and the vacuum chamber can be a cuboid, a cylinder, a variable thickness structure and other complex regular or irregular structures.
The laser wavelength of the embodiment is selected according to the absorptivity of the workpiece to be processed to the laser.
The size and the form of the vacuum cabin of the embodiment can be adjusted according to actual requirements.
The beneficial effects of this embodiment are:
1. the method and the device have the advantages that the surface to be processed is cleaned before processing, the cleanliness of the processed surface is guaranteed, and the probability of defects caused by factors such as surface stains and oxide layers is reduced. External equipment such as an assembling clamp, a vacuum chamber, a travelling mechanism and the like can be flexibly selected according to specific conditions such as specific machined workpiece size, machined workpiece structure, machining track and the like, and surface modification of a complex structural part can be realized.
2. The vacuum degree is controlled to reach the threshold value required by laser welding, the vacuum degree is kept below 1000Pa according to research results, the vacuum welding is carried out in a vacuum environment, the generation of pores can be effectively inhibited, the oxygen content in the environment is reduced, the oxidation reaction of metal can be inhibited, and particularly, the problem that the oxidation of the surface of a welding seam is inhibited by lower environmental pressure when some metals which are sensitive to oxygen, such as zirconium alloy and the like, are required. Meanwhile, the vacuum environment inhibits plasma plume and metal splashing in the processing process, so that laser energy is stably absorbed by metal, the processing depth of a remelting area is improved, and the laser remelting processing size range is enlarged by matching with swinging laser (the remelting section can reach 12mm in width and 8mm in depth). And the vacuum environment and the swing laser can enlarge the remelting area and control the section shape to be similar to a semicircular section at the same time. Therefore, the forming is good and the efficiency is high, the problems that the existing splashing is large, the number of air holes is large, and the bottom surface profile radian is difficult to control are solved, and the problem that the transmission method cannot meet the requirements of wide and deep remelting size through single processing is solved. The reduction of the environmental pressure can cause the change of basic properties of the material, including the reduction of a boiling point, the increase of recoil pressure and the change of a heat conduction mode, finally causes the reduction of the temperature gradient in the solidification process of a molten pool, the grain size and the grain shape are improved, the weld joint tissue is more prone to isometric crystal growth while the grain size is reduced, the isometric crystal proportion is increased, and the mechanical property and the wear resistance are improved while the grain size is reduced and the isometric crystal proportion is increased.
3. The embodiment adopts laser as a heat source to carry out metal remelting surface modification. The laser has the advantages that the light source has various forms, the light beam can be subjected to energy field tuning by adjusting various parameters, and the degree of freedom for processing a complex structure is higher and more flexible. The technological parameters of the vacuum laser surface modification mainly comprise processing speed, laser power, defocusing amount, swing amplitude, swing frequency, light spot swing mode and the like. The selection of the parameters needs to be according to the shape and the size of a remelted layer of the actual workpiece to be processed; for example, lasers with different wavelengths can be selected according to the absorptivity of different materials to the lasers for more targeted processing; if the swing mode or defocusing amount of the laser can be designed according to the shape requirement of the remelted layer, the laser power, the processing speed, the swing amplitude and the like can be adjusted according to the size of the remelted layer; such as by oscillating a laser or otherwise adjusting the temperature field to affect the structure and size of the tissue, as desired for the structure or size of the tissue. This makes it possible to produce a surface-modified layer having the required dimensional and shape properties. Compared with the traditional electric arc remelting method, the method has higher efficiency and stronger controllability. Compared with the normal pressure laser remelting surface modification, the remelting quality is higher, and the defects are fewer. Compared with electron beam surface modification, the surface modification method has lower cost and higher processing freedom.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the workpiece to be processed after pretreatment in the step one is obtained by polishing, pickling or laser cleaning a pre-remelting area on the surface of the workpiece to be processed. The rest is the same as the first embodiment.
The third concrete implementation mode: this embodiment is different from the first or second embodiment in that: the workpiece to be processed is made of aluminum alloy. The other is the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the welding path in the step one is a straight line or a ring. The others are the same as the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the laser in the step one is fiber laser, semiconductor laser or CO 2 And (4) laser. The rest is the same as the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: the laser wavelength of the laser in the first step is 1070 nm. The rest is the same as the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the light spot swinging mode in the step one is round, square, 8-shaped or infinity-shaped. The others are the same as the first to sixth embodiments.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: the laser processing head in the step one is a laser welding head, a laser cladding head, a swinging laser processing head or an integrating mirror. The rest is the same as the first to seventh embodiments.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: the inert gas in the second step is dry Ar gas, the moisture content is not higher than 1000ppm, the purity is not lower than 99.9 percent, and the flow rate is not higher than 10L/min. The other points are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the present embodiment differs from one of the first to ninth embodiments in that: and in the second step, the vacuum chamber is vacuumized until the pressure is below 1000Pa, and then inert gas is introduced until the pressure is 0.01 Pa-1000 Pa. The other points are the same as those in the first to ninth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
in the first embodiment, the laser remelting surface modification is performed on the position where the surface of the aluminum alloy piston cylinder is frequently subjected to stress wear, and the cross section of a cladding layer is required to be a smooth semicircular-like cross section, the width of the cross section is 12mm, and the depth of the cross section is 8 mm:
a vacuum laser remelting surface modification method is carried out according to the following steps:
firstly, placing, clamping and laser adjusting:
placing a preprocessed workpiece to be processed on an operating platform in a vacuum cabin, arranging a transverse rotary table and a clamp on the operating platform to realize clamping, fixing and rotating, then adjusting the swing mode of an output light spot of a laser to be 8-shaped, adjusting the position of a laser processing head to enable the light spot to be aligned with the processing starting point of a pre-remelting area, and adjusting the welding path of the laser processing head to be annular;
secondly, laser remelting:
closing a vacuum cabin door, opening an electric control baffle valve of the vacuum cabin, opening a vacuumizing pump set, vacuumizing the vacuum cabin until the pressure is below 100Pa, then opening a protective gas inlet valve, introducing inert gas into the cabin, setting automatic adjustment, and performing vacuum laser remelting surface modification under the conditions that the laser processing speed is 0.6m/min, the laser power is 6kW, the defocusing amount is +5mm, the swing amplitude is 4mm and the swing frequency is 20Hz until a light spot walking track covers the whole pre-remelting area, wherein the dynamic balance of air inlet and air exhaust in the cabin is adjusted to 100 Pa;
thirdly, taking out the workpiece:
after laser remelting, keeping the pressure in the vacuum chamber for 1min, then closing the protective gas inlet valve, stopping introducing inert gas, closing the vacuumizing pump set, stopping vacuumizing, closing the vacuum chamber electric control baffle valve, opening the air inlet valve until the pressure in the chamber reaches the atmospheric pressure, opening the chamber door, taking out the workpiece, and obtaining the aluminum alloy piston cylinder after the vacuum laser remelting surface modification.
And step one, the pre-treated workpiece to be processed is obtained by carrying out laser cleaning on a pre-remelting area on the surface of the workpiece to be processed and removing an oxidation film.
The workpiece to be processed in the step one is an aluminum alloy piston cylinder made of 5083 aluminum alloy.
And the inert gas in the second step is dry Ar gas, the moisture content is 1ppm, the purity is 99.99 percent, and the flow rate is 5L/min.
The laser in the first step is a fast-passing high-power laser, the maximum power is 10000W, and the laser wavelength of the laser is 1070 nm; the laser processing head in the first step is an IPG swinging laser welding head, and the laser processing head can be arranged in a vacuum cabin or outside the vacuum cabin; other equipment comprises a walking mechanism, a warehouse card robot, a vacuum pumping system and a vacuum cabin; and the complete annular cladding track of the light spot on the surface of the aluminum alloy piston cylinder is realized through the setting of the storehouse-card robot and the rotary table.
Comparative experiment: the difference between this comparative experiment and the first example is that: the method is carried out in a normal pressure environment, and the laser does not swing; and step three, obtaining the aluminum alloy piston cylinder subjected to the surface modification by normal-pressure laser remelting. The rest is the same as the first embodiment.
FIG. 1 is a cross-sectional metallographic view of a laser-remelted surface-modified aluminum alloy piston cylinder prepared in comparative experiments (a) and a vacuum-laser-remelted surface-modified aluminum alloy piston cylinder prepared in example one (b); as can be seen from the figure, the vacuum environment and the swing laser can enlarge the remelting area, simultaneously control the section shape to be a smooth semicircular-like section, eliminate air holes and realize the design requirements of 12mm wide and 8mm deep section. In contrast, in the experiment, the cross section width of the laser is only 5.47mm, the cross section depth of the laser is only 6.25mm, and the cross section is in a finger shape and has a tip.
FIG. 2 is a microstructure morphology of a remelting area after remelting surface modification, (a) is a top structure morphology of a melting area of an aluminum alloy piston cylinder after atmospheric laser remelting surface modification prepared by a comparative experiment; (b) the structure appearance of the bottom of the melting zone of the normal-pressure laser remelting surface-modified aluminum alloy piston cylinder prepared by a comparative experiment is shown; (c) the structure appearance of the top of the melting zone of the aluminum alloy piston cylinder body after the vacuum laser remelting surface modification prepared in the first embodiment is obtained; (d) the structure appearance of the bottom of the melting zone of the aluminum alloy piston cylinder body after the vacuum laser remelting surface modification is prepared in the first embodiment; as can be seen from the figure, the vacuum swinging laser remelting method enables the tissues at the top and the bottom of the melting zone to be obviously thinned, and the columnar crystals at the bottom are broken into fine isometric crystals under the stirring action of the swinging laser.
Claims (10)
1. A vacuum laser remelting surface modification method is characterized by comprising the following steps:
firstly, placing, clamping and laser adjusting:
placing the preprocessed workpiece to be processed in a vacuum cabin, clamping and fixing the workpiece, and then adjusting the swing mode of the output light spot of the laser, the position of a laser processing head and the welding path of the laser processing head;
secondly, laser remelting:
vacuumizing a vacuum chamber, introducing inert gas, and carrying out vacuum laser remelting surface modification under the conditions that the laser processing speed is 0.1-12 m/min, the laser power is 0.5-50 kW, the defocusing amount is-30 mm, the swinging amplitude is 0.2-12 mm and the swinging frequency is 10-1000 Hz until a light spot walking track covers the whole pre-remelting area;
thirdly, taking out the workpiece:
after laser remelting, keeping the pressure in the vacuum chamber, stopping introducing inert gas and vacuumizing, opening the air inlet valve until the pressure in the chamber reaches the atmospheric pressure, and taking out the workpiece to finish the vacuum laser remelting surface modification method.
2. The vacuum laser remelting surface modification method according to claim 1, wherein the workpiece to be processed after the pretreatment in the step one is obtained by grinding, pickling or laser cleaning a remelting area on the surface of the workpiece to be processed.
3. The vacuum laser remelting surface modification method according to claim 2, wherein the workpiece to be processed is made of an aluminum alloy.
4. The vacuum laser remelting surface modification method according to claim 1, wherein the welding path in the first step is linear or circular.
5. The vacuum laser remelting surface modification method according to claim 1, wherein the laser in the first step is fiber laser, semiconductor laser or CO 2 And (4) laser.
6. The vacuum laser remelting surface modification method according to claim 5, wherein the laser wavelength of the laser in step one is 1070 nm.
7. The vacuum laser remelting surface modification method according to claim 1, wherein the spot oscillation mode in step one is circular, square, 8-shaped or "∞" shaped.
8. The vacuum laser remelting surface modification method according to claim 1, wherein the laser processing head in the first step is a laser welding head, a laser cladding head, a swinging laser processing head or an integrating mirror.
9. The vacuum laser remelting surface modification method according to claim 1, wherein the inert gas in the second step is dry Ar gas, and has a moisture content of not more than 1000ppm, a purity of not less than 99.9%, and a flow rate of not more than 10L/min.
10. The vacuum laser remelting surface modification method according to claim 1, wherein in the second step, the vacuum chamber is vacuumized to a pressure of less than 1000Pa, and then inert gas is introduced to a pressure of 0.01Pa to 1000 Pa.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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