CN110686596A - Automatic monitoring device and monitoring method for focal plane of laser shot blasting system - Google Patents
Automatic monitoring device and monitoring method for focal plane of laser shot blasting system Download PDFInfo
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- CN110686596A CN110686596A CN201910994695.2A CN201910994695A CN110686596A CN 110686596 A CN110686596 A CN 110686596A CN 201910994695 A CN201910994695 A CN 201910994695A CN 110686596 A CN110686596 A CN 110686596A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
The invention discloses a focal plane monitoring device of a laser shot blasting system and a monitoring method thereof, wherein the device comprises a light guide pipe, laser indicators and an image recognition probe, wherein the inner wall of the light guide pipe is inclined, dry compressed air is input into the light guide pipe, the two laser indicators are arranged according to a certain angle, the intersection point is set as a focal plane of pulse laser, and the distribution mode of an indication light source is recognized through the image recognition probe, so that the spatial position of the focal plane is accurately and efficiently detected; the method comprises the following steps: adjusting the angles of the first laser indicator and the second laser indicator to enable the first indicating light and the second indicating light to intersect on a focal plane; enabling the position to be processed on the surface of the part to be positioned on the intersection point of the first indicating light and the second indicating light; the image recognition probe captures an imaging image of the part and the indicating light on the surface of the part, and judges whether the part is positioned on a focal plane or not by recognizing the imaging positions of the two beams of indicating light on the surface of the part; if the position of the part is not on the focal plane, adjusting the position of the part; and controlling laser shot blasting to process the surface of the part.
Description
Technical Field
The invention relates to the field of mechanical design, in particular to an automatic focal plane monitoring device for a laser shot blasting system and a monitoring method thereof.
Background
The laser peening system is special equipment for carrying out laser peening strengthening and mainly comprises a laser, an optical path system, an industrial robot and the like. The laser shot blasting system mainly uses a solid laser, the working wavelength is generally 1064nm, the wavelength is a four-level system, the single pulse outputs energy of 1-10J, the pulse width is ns magnitude, and the power is 50-200W. The characteristics of the pulse laser as a processing light source need to be adjusted and the process needs to be monitored, wherein the focal plane is an important index and influences the pulse energy conversion and the setting of the position of a part. Therefore, the invention discloses a method for accurately, efficiently and stably monitoring a focal plane on line.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an automatic focal plane monitoring device for a laser peening system.
Another object of the present invention is to overcome the disadvantages of the prior art and to provide a monitoring method based on the above device.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a laser peening system focal plane automatic monitoring device, this monitoring devices mainly includes the mounting panel and sets up the light pipe, first laser pointer, second laser pointer on the mounting panel, image recognition probe and be used for the mount pad of installation and fixed laser pointer.
Specifically, the mounting plate is fixedly arranged at a laser emitting end of the laser peening system and is perpendicular to the laser emitting direction. The light guide pipe is vertically fixed on the mounting plate, one end of the light guide pipe is connected with a laser ejection end of the laser shot blasting system, and the other end of the light guide pipe extends forwards to be used as a laser ejection port. The image recognition probe is fixed on the light guide pipe, and the detection end of the image recognition probe is the same as the laser emitting direction. The first laser indicator is arranged on one side of the light guide pipe and fixed on the mounting plate through the mounting seat, and a light beam generated by the first laser indicator is first indicating light. The second laser indicator is arranged on the other side of the light guide pipe and fixed on the mounting plate through the mounting seat, and light beams generated by the second laser indicator are second indicating light. The first indicating light, the second indicating light and the laser beam are in the same plane. The first indicating light emitted by the first laser indicator and the second indicating light emitted by the second laser indicator jointly intersect on the laser beam, and the intersection point is positioned on the focal plane of the laser beam.
As a preferable scheme of the invention, in order to adjust the installation position of the laser pointer, the installation seat of the laser pointer instrument adopts a magnetic meter seat.
Furthermore, in order to adjust the light beam emitting angle of the laser indicator conveniently, the mounting seat is also provided with a universal joint for adjusting the angle at will. The universal joint is arranged on the mounting seat and connected with the laser indicator so as to adjust the angle of the laser indicator.
As a preferred embodiment of the present invention, the first laser pointer uses a red visible light laser beam, and the parameters thereof are as follows: the wavelength is 635nm, the red spot-shaped light spot is formed, and the power is more than 2 mW.
As a preferred embodiment of the present invention, the second laser pointer uses a green visible light laser beam, and the parameters thereof are as follows: the wavelength is 532nm, green point-like light spots are formed, and the power is more than 2 mW.
As the preferred scheme of the invention, the light guide pipe is used for the final output protection from pulse laser to a part to be processed, the main function is to transmit laser internally and shield various impurities in the air, and in order to prevent the focusing and energy loss of a processing light source, the inner wall of the light guide pipe is inclined by 15-30 degrees, so that the thickness of the inner wall of the light guide pipe is gradually reduced from the end close to the installation plate to the laser emitting end. The angle also makes use of the fact that the condensed water is drained out of the opening end of the light guide pipe in time under the action of gravity.
Further, in order to continuously provide positive pressure in the cavity to ensure stable light beam transmission, the light guide pipe is also provided with an air inlet for introducing dry air. The air inlet is perpendicular to the light pipe and located at one end close to the mounting plate. Meanwhile, the image recognition probe is installed at the top of the light guide pipe, water mist can be effectively prevented, the introduced compressed air can continuously clean an image capturing area, and signal acquisition strength is guaranteed.
The other purpose of the invention is realized by the following technical scheme:
a method for automatically monitoring a focal plane of a laser shot blasting system mainly comprises the following specific steps:
step S1: and adjusting the angles of the first laser pointer and the second laser pointer to enable the first indicating light and the second indicating light to intersect on a focal plane.
Step S2: and adjusting the vertical distance between the surface of the part to be processed and the mounting plate to enable the position of the surface of the part to be processed to be positioned on the intersection point of the first indicating light and the second indicating light.
Step S3: the image recognition probe captures an imaging image of the part and the indicating light on the surface of the part, and judges whether the part is positioned on a focal plane or not by recognizing the imaging positions of the two beams of indicating light on the surface of the part; if the position of the part is not on the focal plane, the position of the part is adjusted.
The step S3 specifically further includes:
step S31: analyzing the captured image: and when the intersection point of the first indicating light and the second indicating light is positioned on the surface to be processed of the part by taking the image central line as a reference, the surface to be processed is positioned on the focal plane, and the processing can be carried out.
Step S32: when the imaging point of the first indicating light is located on one side of the first laser indicator and the imaging point of the second indicating light is located on one side of the second laser indicator, that is, the surface to be processed is located in front of the focal plane, the part needs to be adjusted in the direction away from the light guide pipe.
Step S33: when the imaging point of the first indicating light is located on one side of the second laser indicator and the imaging point of the second indicating light is located on one side of the first laser indicator, that is, the surface to be processed is located behind the focal plane, the part needs to be adjusted in the direction close to the light guide pipe.
Step S4: and controlling laser shot blasting to process the surface of the part.
Compared with the prior art, the invention also has the following advantages:
(1) the automatic monitoring device and the monitoring method for the focal plane of the laser shot blasting system can accurately and efficiently detect the spatial position of the focal plane through good collimation and real-time image recognition of laser.
Drawings
FIG. 1 is a schematic structural diagram of an automatic focal plane monitoring device of a laser peening system provided by the invention.
FIG. 2 is a schematic diagram of the relationship between the optical path and the focal plane provided by the present invention.
FIG. 3 is a schematic structural diagram of a light guide tube provided by the present invention.
FIG. 4 is a logic diagram of focal plane distance determination provided by the present invention.
The reference numerals in the above figures illustrate:
1-magnetic gauge stand, 2-first laser pointer, 3-first indicating light, 4-second laser pointer, 5-second indicating light, 6-focal plane, 7-intersection point, 8-light guide pipe, 9-laser beam, 10-image recognition probe, 11-mounting plate (light source plane), 12-air inlet, 13-inner wall thickness, 14-acquired image, 15-image center line, 16-light spot coincidence, 17-light spot intersection in front of part, and 18-light spot intersection behind part.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described below with reference to the accompanying drawings and examples.
Example 1:
as shown in fig. 1 to 4, the present embodiment discloses an automatic focal plane monitoring device for a laser peening system, which mainly comprises a mounting plate 11, a light pipe 8 arranged on the mounting plate 11, a first laser pointer 2, a second laser pointer 4, an image recognition probe 10 and a mounting seat for mounting and fixing the laser pointer.
Specifically, the mounting plate 11 is fixedly arranged at a laser emitting end of the laser peening system and is perpendicular to the laser emitting direction. The light guide pipe 8 is vertically fixed on the mounting plate 11, one end of the light guide pipe is connected with a laser emitting end of the laser shot blasting system, and the other end of the light guide pipe extends forwards to be used as a laser emitting port. The image recognition probe 10 is fixed on the light pipe 8, and the detection end of the image recognition probe is the same as the emitting direction of the laser. The first laser pointer 2 is arranged on one side of the light guide pipe 8 and is fixed on the mounting plate 11 through a mounting seat, and a light beam generated by the first laser pointer is the first indicating light 3. The second laser pointer 4 is arranged on the other side of the light guide pipe 8 and fixed on the mounting plate 11 through a mounting seat, and the light beam generated by the second laser pointer is the second indicating light 5. The first indicating light 3, the second indicating light 5 and the laser beam 9 are in the same plane. The first pointer light 3 emitted by the first laser pointer 2 and the second pointer light 5 emitted by the second laser pointer 4 intersect on the laser beam 9, and the intersection point 7 is located on the focal plane 6 of the laser beam 9.
As a preferable scheme of the invention, in order to adjust the installation position of the laser pointer, the installation base of the invention adopts the magnetic meter base 1.
Furthermore, in order to adjust the light beam emitting angle of the laser indicator conveniently, the mounting seat is also provided with a universal joint for adjusting the angle at will. The universal joint is arranged on the mounting seat and connected with the laser indicator so as to adjust the angle of the laser indicator.
As a preferred embodiment of the present invention, the first laser pointer 2 uses a red visible light laser beam 9, and the parameters thereof are: the wavelength is 635nm, the red spot-shaped light spot is formed, and the power is more than 2 mW.
As a preferred embodiment of the present invention, the second laser pointer 4 uses a green visible laser beam 9, and the parameters thereof are as follows: the wavelength is 532nm, green point-like light spots are formed, and the power is more than 2 mW.
As the preferred scheme of the invention, the light pipe 8 is the final output protection from the pulse laser to the part to be processed, the main function is to transmit the laser internally and shield various impurities in the air, in order to prevent the focusing and energy loss of the processing light source, the inner wall of the light pipe 8 is inclined by 15 to 30 degrees, so that the thickness 13 of the inner wall of the light pipe 8 is gradually reduced from the end close to the mounting plate 11 to the laser emitting end. The angle also allows condensate to drain away from the open end of the light pipe 8 in time under the action of gravity.
Further, in order to continuously provide positive pressure in the cavity to ensure stable light beam transmission, the light guide pipe 8 of the present invention is further provided with an air inlet 12 for introducing dry air. The air inlet 12 is arranged perpendicular to the light pipe 8 and is located at one end near the mounting plate 11. Meanwhile, the image recognition probe 10 is arranged at the top of the light guide pipe 8, water mist can be effectively prevented, the introduced compressed air can continuously clean an image capturing area, and the signal acquisition strength is ensured.
The embodiment also discloses an automatic monitoring method for the focal plane of the laser shot blasting system, which mainly comprises the following specific steps:
step S1: the angles of the first laser pointer 2 and the second laser pointer 4 are adjusted so that the first pointer light 3 intersects the second pointer light 5 on the focal plane 6.
Step S2: and adjusting the vertical distance between the surface of the part to be processed and the mounting plate 11 so that the position of the surface of the part to be processed is positioned on the intersection point 7 of the first indicating light 3 and the second indicating light 5.
Step S3: the image recognition probe 10 captures an imaging image of the part and the indicating light on the surface of the part, and judges whether the part is on the focal plane 6 by recognizing the imaging positions of the two beams of indicating light on the surface of the part; if not on the focal plane 6, the part position is adjusted.
The step S3 specifically further includes:
step S31: analysis of the acquired image 14: when the intersection point 7 of the first indicating light 3 and the second indicating light 5 is positioned on the surface to be processed of the part, namely, the surface to be processed is positioned on the focal plane 6, the processing can be carried out by taking the image central line 15 as a reference.
Step S32: when the imaging point of the first indicating light 3 is located on one side of the first laser pointer 2 and the imaging point of the second indicating light 5 is located on one side of the second laser pointer 4 (the light spots intersect 18 behind the part), that is, the surface to be processed is located in front of the focal plane 6, the part needs to be adjusted in a direction away from the light guide pipe 8.
Step S33: when the imaging point of the first indicating light 3 is located on one side of the second laser pointer 4 and the imaging point of the second indicating light 5 is located on one side of the first laser pointer 2 (the light spots intersect 17 in front of the part), that is, the surface to be processed is located behind the focal plane 6, the part needs to be adjusted to be close to the light guide pipe 8.
Step S4: and controlling laser shot blasting to process the surface of the part.
Example 2:
the embodiment discloses a device and a method for monitoring a focal plane of a laser peening system, wherein the device comprises a light pipe 8, a laser pointer and an image recognition probe 10.
As shown in fig. 1, 2 laser pointers (indicating light source, visible light) are fixed by using a magnetic meter base 1, and the magnetic meter base 1 is provided with a universal joint and can be set at any angle. Wherein, the parameters of one red laser indicator are that the wavelength is 635nm, the red point-like light spot and the power is more than 2 mW; the other parameter of the green laser indicator is 532nm wavelength, green point-like light spot and power >2 mW. Adjusting the angles of the two indicating light sources, arranging the red and green light spot intersection point 7 on the focal plane 6 of the pulse laser, and determining the vertical distance from the light spot intersection point 7 of the red laser beam 9 and the green laser beam 9 to the focal plane 6 as the focal plane 6 of the pulse laser.
As shown in fig. 2, the starting point plane of the indicating light source and the focal plane 6 of the pulse laser are determined by the light source characteristics of the pulse laser beam 9, since the pulse laser beam 9 is invisible light, two visible indicating light sources are used for auxiliary calibration, and the intersection point 7 of the red laser beam 9 and the green laser beam 9 is arranged on the focal plane 6, so that the distance characteristics of the focal plane 6 can be detected in real time.
When the surface of the part to be processed moves between the starting point plane and the focal plane 6 of the pulse laser to find a focus, the red and green light spots form an image on the surface of the part, and only when the red and green light spots coincide with 16, the surface of the part coincides with the focal plane 6 of the pulse laser (processing light source), and the part can be processed at the position.
As shown in fig. 3, the light pipe 8 is used for protecting the final output of the pulse laser to the part to be processed, and mainly functions to transmit the laser internally, shield various impurities in the air, and prevent the focusing and energy loss of the processing light source. Wherein the inner wall slope 15 ~ 30 of light pipe 8 utilizes gravity in time to get rid of the comdenstion water by the tip, and dry compressed air is inputed to 8 interfaces of light pipe simultaneously, continuously guarantees to provide the malleation in the cavity and guarantees that light beam transmission is stable. The image recognition probe 10 is arranged at the top of the light guide pipe 8, water mist can be effectively prevented, the introduced compressed air can continuously clean an image capturing area, and the signal acquisition strength is ensured.
As shown in fig. 4, the distribution pattern of the pointing light source is recognized by the image recognition probe 10 fixed to the light guide 8, and the distance of the focal plane 6 is monitored by logical judgment.
The initial indicating light sources are set to the left red laser beam 9 and the right green laser beam 9 in the figure.
On any section captured by the image recognition probe 10, by taking an image central line 15 as a reference, when the red and green light spots are superposed 16, the surface to be processed is in a focal plane 6 (in a focusing state), and a processing instruction can be sent;
when the red-green light spots are distributed on two sides of the central line, the distance between the two adjacent light spots needs to be increased according to the initial setting of the indicating light source as a reference, if the red light spot is on the left and the green light spot is on the right, the section is positioned in front of the focal length.
If the red spot is on the right and the green spot is on the left, the cross-section is shown to be behind the focal length, and the focal length needs to be reduced.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. The automatic focal plane monitoring device of the laser shot blasting system is characterized by comprising a mounting plate, a light guide pipe, a first laser indicator, a second laser indicator, an image recognition probe and a mounting seat, wherein the light guide pipe, the first laser indicator, the second laser indicator, the image recognition probe and the mounting seat are arranged on the mounting plate;
the mounting plate is fixedly arranged at a laser emitting end of the laser shot blasting system and is vertical to the laser emitting direction; the light guide pipe is vertically fixed on the mounting plate, one end of the light guide pipe is connected with a laser ejection end of the laser shot blasting system, and the other end of the light guide pipe extends forwards to be used as a laser ejection port; the image recognition probe is fixed on the light guide pipe, and the detection end of the image recognition probe is the same as the laser emission direction; the first laser indicator is arranged on one side of the light guide pipe and is fixed on the mounting plate through the mounting seat, and a light beam generated by the first laser indicator is first indicating light; the second laser indicator is arranged on the other side of the light guide pipe and is fixed on the mounting plate through the mounting seat, and a light beam generated by the second laser indicator is second indicating light; the first indicating light, the second indicating light and the laser beam are in the same plane; the first indicating light emitted by the first laser indicator and the second indicating light emitted by the second laser indicator jointly intersect on the laser beam, and the intersection point is positioned on the focal plane of the laser beam.
2. The automatic focal plane monitoring device of the laser peening system according to claim 1, wherein the mounting base is a magnetic gauge base.
3. The automatic focal plane monitoring device of the laser peening system according to claim 1, wherein a universal joint for arbitrary angle adjustment is further provided on the mounting base; the universal joint is arranged on the mounting seat and connected with the laser indicator so as to adjust the angle of the laser indicator.
4. The automatic focal plane monitoring device of a laser peening system according to claim 1, wherein the first laser indicator uses a red visible light laser beam, and the parameters of the red visible light laser beam are as follows: the wavelength is 635nm, the red spot-shaped light spot is formed, and the power is more than 2 mW.
5. The automatic focal plane monitoring device of a laser peening system as claimed in claim 1, wherein the second laser indicator uses a green visible laser beam, and the parameters thereof are as follows: the wavelength is 532nm, green point-like light spots are formed, and the power is more than 2 mW.
6. The automatic focal plane monitoring device for a laser peening system according to claim 1, wherein the inner wall of the light pipe is inclined at an angle of 15 to 30 degrees so that the thickness of the inner wall of the light pipe gradually decreases from the end near the mounting plate toward the laser emitting end.
7. The automatic focal plane monitoring device of a laser peening system according to claim 1, wherein the light pipe is further provided with an air inlet for introducing dry air; the air inlet is perpendicular to the light pipe and located at one end close to the mounting plate.
8. The automatic monitoring method for the focal plane of the laser peening system according to any one of claims 1 to 7, comprising the steps of:
step S1: adjusting the angles of the first laser indicator and the second laser indicator to enable the first indicating light and the second indicating light to intersect on a focal plane;
step S2: adjusting the vertical distance between the surface of the part to be processed and the mounting plate to enable the position of the surface of the part to be processed to be located on the intersection point of the first indicating light and the second indicating light;
step S3: the image recognition probe captures an imaging image of the part and the indicating light on the surface of the part, and judges whether the part is positioned on a focal plane or not by recognizing the imaging positions of the two beams of indicating light on the surface of the part; if the position of the part is not on the focal plane, adjusting the position of the part;
step S4: and controlling laser shot blasting to process the surface of the part.
9. The method for automatically monitoring the focal plane of a laser peening system according to claim 8, wherein the step S3 further includes:
step S31: analyzing the captured image: when the intersection point of the first indicating light and the second indicating light is positioned on the surface to be processed of the part by taking the image central line as a reference, the surface to be processed is positioned on a focal plane and can be processed;
step S32: when the imaging point of the first indicating light is positioned at one side of the first laser indicator and the imaging point of the second indicating light is positioned at one side of the second laser indicator, namely the imaging point of the second indicating light indicates that the surface to be processed is positioned in front of the focal plane, the part needs to be adjusted in the direction away from the light guide pipe;
step S33: when the imaging point of the first indicating light is located on one side of the second laser indicator and the imaging point of the second indicating light is located on one side of the first laser indicator, that is, the surface to be processed is located behind the focal plane, the part needs to be adjusted in the direction close to the light guide pipe.
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| CN201910994695.2A CN110686596A (en) | 2019-10-18 | 2019-10-18 | Automatic monitoring device and monitoring method for focal plane of laser shot blasting system |
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Application publication date: 20200114 |