CN117564478A - Laser shock strengthening device with processing on-line monitoring function and on-line monitoring method - Google Patents

Laser shock strengthening device with processing on-line monitoring function and on-line monitoring method Download PDF

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Publication number
CN117564478A
CN117564478A CN202311869285.8A CN202311869285A CN117564478A CN 117564478 A CN117564478 A CN 117564478A CN 202311869285 A CN202311869285 A CN 202311869285A CN 117564478 A CN117564478 A CN 117564478A
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CN
China
Prior art keywords
laser
laser beam
upper computer
energy
line monitoring
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Pending
Application number
CN202311869285.8A
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Chinese (zh)
Inventor
马永新
王浩
张瑄珺
陆越
夏琪
张玲玲
董岿然
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Shanghai Laser Technology Research Institute Co ltd
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Shanghai Laser Technology Research Institute Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Laser Technology Research Institute Co ltd filed Critical Shanghai Laser Technology Research Institute Co ltd
Priority to CN202311869285.8A priority Critical patent/CN117564478A/en
Publication of CN117564478A publication Critical patent/CN117564478A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B23K26/356—Working by laser beam, e.g. welding, cutting or boring for surface treatment by shock processing
    • 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
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/0643—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising mirrors
    • 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
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
    • 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
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/067—Dividing the beam into multiple beams, e.g. multifocusing
    • B23K26/0676—Dividing the beam into multiple beams, e.g. multifocusing into dependently operating sub-beams, e.g. an array of spots with fixed spatial relationship or for performing simultaneously identical operations
    • 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
    • B23K26/705—Beam measuring device
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention relates to a laser shock peening device with processing on-line monitoring and an on-line monitoring method, comprising the following steps: an upper computer; the laser is connected with the upper computer and is used for outputting laser beams with preset intensity according to the control of the upper computer; a beam splitter for splitting the laser beam into a first laser beam and a second laser beam, the second laser beam energy having a first duty cycle of the laser beam energy; a focusing lens for focusing the first laser beam and irradiating the first laser beam on the workpiece; the energy monitoring module is used for monitoring the energy value of the second laser beam and transmitting the energy value to the upper computer; and when the energy value of the second laser beam exceeds the preset standard threshold range and lasts for a preset time period, the upper computer controls the laser to stop outputting the laser beam. According to the invention, when the energy value of the second laser beam monitored by the upper computer exceeds the preset standard threshold value and lasts for the preset time, the processing of the workpiece is stopped, so that the reinforcement effect of the workpiece is prevented from being influenced by unstable laser energy.

Description

Laser shock strengthening device with processing on-line monitoring function and on-line monitoring method
Technical Field
The invention relates to the technical field of laser shock peening, in particular to a laser shock peening device with processing on-line monitoring and an on-line monitoring method.
Background
The laser shock strengthening is that laser beam irradiates and adheres to the absorbing layer with the substrate surface through the constraint layer, the absorbing layer absorbs laser energy to generate explosive gasification to generate high-pressure plasma, under the action of the constraint layer, shock waves which are transmitted to the inside of the material are generated, plastic deformation is generated on the surface layer of the material to generate hardening and residual compressive stress layers, and meanwhile, surface grains are thinned, good surface integrity is presented, and the performances of wear resistance, fatigue resistance and the like of the metal material can be effectively improved. In the laser shock strengthening process, when the laser energy output by the laser is unstable, the strengthening effect can be affected, so that the method has good practical significance for monitoring the laser processing state in real time in engineering application.
Disclosure of Invention
Accordingly, it is necessary to provide a laser shock peening apparatus with on-line monitoring of processing and an on-line monitoring method capable of performing real-time monitoring in order to solve the above-mentioned problems.
The invention provides a laser shock strengthening device with processing on-line monitoring, which comprises:
an upper computer;
the laser is connected with the upper computer and is used for outputting laser beams with preset intensity according to the control of the upper computer;
a beam splitter configured to split a laser beam into a first laser beam and a second laser beam, where the second laser beam energy is a first duty cycle of the laser beam energy;
a focusing lens for focusing the first laser beam and irradiating the workpiece;
the energy monitoring module is used for monitoring the energy value of the second laser beam and transmitting the energy value to the upper computer;
and when the energy value of the second laser beam exceeds a preset standard threshold range and lasts for a preset duration, the upper computer controls the laser to stop outputting the laser beam.
In one embodiment, the first duty cycle is 0.5% to 2%.
In one embodiment, the device further comprises an image acquisition module, wherein the image acquisition module is used for shooting the light spot subjected to laser shock peening on the workpiece absorption layer and transmitting the light spot image to the upper computer.
In one embodiment, the upper computer compares the light spot image with a preset standard light spot value, and if the light spot image exceeds the standard light spot value range, the upper computer controls the laser to stop outputting the laser beam.
In one embodiment, the apparatus includes a plurality of mirrors for adjusting the length of the optical path between the laser and the beam splitter and reflecting the laser beam onto the beam splitter.
In one embodiment, the device further comprises a laser range finder, wherein the laser range finder is installed at a light outlet of the laser and is used for measuring the distance from the laser beam to the workpiece and transmitting distance data to the upper computer.
In one embodiment, the apparatus further comprises a rotating member for mounting a plurality of the beamsplitters and for switching the beamsplitters.
In one embodiment, the device further comprises an early warning module, wherein the early warning module is connected with the upper computer and sends out an early warning prompt when the data monitored by the upper computer exceeds threshold data.
The invention also provides an on-line monitoring method which is applied to the laser shock strengthening device with the on-line processing monitoring function, and the method comprises the following steps:
the upper computer selects processing parameters according to user input and controls the laser to output laser beams to the absorption layer of the sample;
the energy monitoring module monitors and records the energy value of the second laser beam in real time and transmits the energy value to the upper computer;
and when the energy value of the second laser beam exceeds the preset standard threshold range and lasts for a preset duration, the upper computer sends out a second early warning signal and controls the laser to stop outputting the laser beam.
In one embodiment, the method further comprises:
the image acquisition module acquires the light spot image on the absorption layer in real time and transmits the light spot image to the upper computer;
and the upper computer compares the light spot image with a preset standard light spot value, and if the light spot image exceeds the standard light spot value range, the upper computer sends out a first early warning signal and controls the laser to stop outputting the laser beam.
According to the laser shock strengthening device with the on-line processing monitoring function and the on-line detection method, the laser beam output by the laser is split into the first laser beam and the second laser beam through the spectroscope, the energy monitoring module monitors the energy value of the second laser beam and transmits the energy value to the upper computer, the upper computer calculates the energy of the laser beam reaching the spectroscope and the energy of the first laser beam according to the first duty ratio of the spectroscope, when the energy of the laser beam fluctuates, the upper computer controls the laser to stop outputting the laser beam when the energy value of the second laser beam monitored by the upper computer exceeds the preset standard threshold value for a preset time period, and therefore processing of a workpiece is stopped, the user re-adjusts parameters of the upper computer and then re-controls the laser to process the workpiece, and accordingly laser energy output by the laser is stabilized, and the strengthening effect of the workpiece is prevented from being influenced by unstable laser energy.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, a brief description will be given below of the drawings used in the embodiments or the description of the prior art, it being obvious that the drawings in the following description are some embodiments of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a laser shock peening apparatus with in-line process monitoring according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a laser shock peening apparatus with on-line monitoring of processing according to another embodiment of the present invention;
FIG. 3 is a flow chart of an on-line monitoring method according to an embodiment of the invention;
FIG. 4 is a flowchart of an on-line detection method according to another embodiment of the present invention.
Reference numerals:
110. an upper computer; 120. a laser; 130. a beam splitter; 140. a focusing lens; 150. an energy monitoring module; 160. an image acquisition module; 170. an early warning module; 50. a workpiece.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. 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.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and the like are used in the description of the present invention for the purpose of illustration only and do not represent the only embodiment.
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 at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may be that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through intermedial media. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.
Unless defined otherwise, all technical and scientific terms used in the specification of the present invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in the description of the present invention includes any and all combinations of one or more of the associated listed items.
The laser shock peening apparatus with processing on-line monitoring and the on-line monitoring method of the present invention are described below with reference to fig. 1 to 4.
As shown in fig. 1, in one embodiment, a laser shock enhancement device with on-line processing monitoring includes a host computer 110, a laser 120, a beam splitter 130, a focusing lens 140 and an energy monitoring module 150, where the host computer 110 is respectively connected to the laser 120 and the energy monitoring module 150, and the beam splitter 130 and the focusing lens 140 are on an optical path of a laser beam output by the laser 120.
The upper computer 110 is a computer control system.
The laser 120 is used for outputting a laser beam of preset intensity according to the control of the host computer 110.
The beam splitter 130 is configured to split the laser beam into a first laser beam and a second laser beam, wherein the second laser beam energy is a first duty cycle of the laser beam energy. Preferably, the first ratio is 0.5% to 2%.
The focusing lens 140 focuses the first laser beam and irradiates the workpiece 50.
The energy monitoring module 150 is configured to monitor an energy value of the second laser beam and transmit the energy value to the upper computer 110;
wherein, when the energy value of the second laser beam exceeds the preset standard threshold value for a preset time period, the upper computer 110 controls the laser to stop outputting the laser beam.
In the laser shock strengthening device with on-line monitoring for processing in this embodiment, the laser beam output by the laser 120 is split into the first laser beam and the second laser beam by the beam splitter 130, the energy monitoring module 150 monitors the energy value of the second laser beam and transmits the energy value to the upper computer 110, the upper computer 110 calculates the energy of the laser beam reaching the beam splitter 130 and the energy of the first laser beam according to the first duty ratio of the beam splitter 130, when the energy of the laser beam fluctuates, the upper computer 110 controls the laser 120 to stop outputting the laser beam when the energy value of the second laser beam monitored by the upper computer 110 exceeds the preset standard threshold and lasts for the preset duration, thereby stopping processing the workpiece, and the user re-controls the laser 120 to process the workpiece after re-adjusting the parameters of the upper computer 110, thereby stabilizing the laser energy output by the laser 120, and avoiding the influence on the strengthening effect of the workpiece due to unstable laser energy.
In this embodiment, the laser shock peening apparatus with online processing monitoring further includes an image acquisition module 160 and an early warning module (not shown), where the image acquisition module 160 is configured to capture a laser shock peening light spot on the workpiece absorption layer, and transmit the light spot image to the upper computer 110. Specifically, the upper computer compares the spot image with a preset standard spot value, and if the spot image exceeds the standard spot value range, the upper computer controls the laser 120 to stop outputting the laser beam. The early warning module is connected with the upper computer 110 and sends out an alarm prompt when the data monitored by the upper computer 110 exceeds threshold data, for example, when the energy value of the second laser beam exceeds a preset standard threshold value and lasts for a preset period of time, the upper computer 110 sends out a second early warning signal; when the light spot image exceeds the preset standard light spot value range, the upper computer 110 sends out a first early warning signal. By comparing the shot light spot image with a preset standard light spot value, the laser shock strengthening effect can be monitored in real time, and when the effect is poor, the upper computer 110 can send out a first early warning signal and control the laser 120 to stop outputting the laser beam so as to avoid processing an undesirable workpiece.
As shown in fig. 2, in one embodiment, the laser shock peening apparatus with in-line process monitoring includes a plurality of mirrors 170 for adjusting the length of the optical path between the laser 120 and the beam splitter 130 to adapt to working environments with different space sizes, and the laser beam is reflected onto the beam splitter 130 through the plurality of mirrors 170.
In this embodiment, the laser shock peening apparatus with on-line monitoring of processing further includes a laser rangefinder (not shown) and a rotating member (not shown), the laser rangefinder is installed at the light outlet of the laser 120, and is used for measuring the distance of the laser beam transmitted to the workpiece 50 and transmitting distance data to the upper computer. Any impact strengthening technology does not have small plastic deformation on the strengthened component, especially some thin-wall materials are easy to deform, so that the original set laser working distance is changed to influence the strengthening effect, and the distance between the laser 120 and the workpiece 50 can be measured by the laser range finder, so that a user can adjust in time when the distance is changed greatly. The rotating member is used for installing a plurality of beam splitters 130 and for switching the beam splitters 130, and the first duty ratio of each beam splitter 130 is different.
In addition, the invention also provides an online monitoring method.
As shown in fig. 3, in one embodiment, a method for on-line monitoring is applied to the laser shock peening apparatus with on-line monitoring of processing in the embodiment of fig. 1 and 2, and the method includes the following steps:
in step S310, the upper computer selects processing parameters according to user input and controls the laser to output a laser beam to the absorption layer of the workpiece.
In step S320, the energy monitoring module monitors and records the energy value of the second laser beam in real time, and transmits the energy value to the host computer.
In step S330, the upper computer sends out a second early warning signal and controls the laser to stop outputting the laser beam when the energy value of the second laser beam exceeds the preset standard threshold range and lasts for a preset duration.
In this embodiment, a method for online monitoring further includes the following steps, see fig. 4:
in step S410, the image acquisition module acquires the light spot image on the absorption layer in real time and transmits the light spot image to the upper computer.
In step S420, the upper computer compares the spot image with a preset standard spot value, and if the spot image exceeds the standard spot value range, sends out a first early warning signal and controls the laser to stop outputting the laser beam.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention, which are within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

Claims (10)

1. A laser shock peening device with on-line monitoring of processing, comprising:
an upper computer;
the laser is connected with the upper computer and is used for outputting laser beams with preset intensity according to the control of the upper computer;
a beam splitter configured to split a laser beam into a first laser beam and a second laser beam, where the second laser beam energy is a first duty cycle of the laser beam energy;
a focusing lens for focusing the first laser beam and irradiating the workpiece;
the energy monitoring module is used for monitoring the energy value of the second laser beam and transmitting the energy value to the upper computer;
and when the energy value of the second laser beam exceeds a preset standard threshold range and lasts for a preset duration, the upper computer controls the laser to stop outputting the laser beam.
2. The laser shock peening device with on-line monitoring of claim 1 wherein said first duty cycle is 0.5% to 2%.
3. The laser shock peening apparatus with on-line monitoring of claim 1, further comprising an image acquisition module for capturing a laser shock peening spot on the workpiece absorption layer and transmitting a spot image to the host computer.
4. The laser shock peening apparatus with on-line monitoring of claim 3, wherein said upper computer compares said spot image with a preset standard spot value, and if said spot image exceeds a standard spot value range, controls said laser to stop outputting laser beam.
5. The laser shock peening device with in-line process monitoring according to claim 1, wherein the device includes a plurality of mirrors for adjusting a length of an optical path between the laser and a beam splitter and reflecting the laser beam onto the beam splitter.
6. The laser shock peening apparatus with on-line monitoring of claim 1, further comprising a laser rangefinder mounted at an exit of the laser for measuring a distance of the laser beam transmitted to the workpiece and transmitting distance data to the host computer.
7. The laser shock peening device with machining on-line monitoring according to claim 1, further comprising a rotating member for mounting a plurality of said beam splitters and for switching said beam splitters.
8. The laser shock peening apparatus with on-line monitoring of any one of claims 1 to 7, further comprising an early warning module connected to the upper computer and sending an early warning prompt when the data monitored by the upper computer exceeds a threshold value data.
9. A method of on-line monitoring, applied to the laser shock peening apparatus with on-line monitoring of processing according to any one of claims 1 to 8, the method comprising:
the upper computer selects processing parameters according to user input and controls the laser to output laser beams to the absorption layer of the sample;
the energy monitoring module monitors and records the energy value of the second laser beam in real time and transmits the energy value to the upper computer;
and when the energy value of the second laser beam exceeds the preset standard threshold range and lasts for a preset duration, the upper computer sends out a second early warning signal and controls the laser to stop outputting the laser beam.
10. The method of on-line monitoring according to claim 9, wherein the method further comprises:
the image acquisition module acquires the light spot image on the absorption layer in real time and transmits the light spot image to the upper computer;
and the upper computer compares the light spot image with a preset standard light spot value, and if the light spot image exceeds the standard light spot value range, the upper computer sends out a first early warning signal and controls the laser to stop outputting the laser beam.
CN202311869285.8A 2023-12-31 2023-12-31 Laser shock strengthening device with processing on-line monitoring function and on-line monitoring method Pending CN117564478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311869285.8A CN117564478A (en) 2023-12-31 2023-12-31 Laser shock strengthening device with processing on-line monitoring function and on-line monitoring method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311869285.8A CN117564478A (en) 2023-12-31 2023-12-31 Laser shock strengthening device with processing on-line monitoring function and on-line monitoring method

Publications (1)

Publication Number Publication Date
CN117564478A true CN117564478A (en) 2024-02-20

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Country Status (1)

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