CN100475414C - Real time monitoring device of the three-dimensional laser beam welding and incising process - Google Patents
Real time monitoring device of the three-dimensional laser beam welding and incising process Download PDFInfo
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- CN100475414C CN100475414C CN 200710052609 CN200710052609A CN100475414C CN 100475414 C CN100475414 C CN 100475414C CN 200710052609 CN200710052609 CN 200710052609 CN 200710052609 A CN200710052609 A CN 200710052609A CN 100475414 C CN100475414 C CN 100475414C
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Abstract
The present invention proposes one kind of 3D real-time monitoring device for laser welding and cutting process. The 3D real-time monitoring device can acquire the coaxial infrared waveband and plasma radiation light signal for real-time quality monitoring. Compared with available technology acquiring only one kind of radiation light information, the present invention has the advantage of providing more precise information for the closed-loop control of 3D laser processing.
Description
Technical field
The present invention relates to a kind of three-dimensional laser welding and cutting processing process and quality be carried out real-time device for monitoring.
Background technology
Laser weld and cutting can be used for processing metal and nonmetallic materials, and the heat affected area is little, because of light beam is easy to guiding, can adopt flexible processing method flexibly.Based on above advantage, industrial, especially obtained using widely in fields such as automobile, metallurgy, Aero-Space and national defence.Yet when laser weld and cutting processing technology are widely used, its process and quality are implemented the efficient real time monitoring be still a problem demanding prompt solution, and be the prerequisite of further implementing closed-loop control.In various three-dimensional laser process, with the laser weld is example, because it is more to influence the factor of welding process, all can influence the stability of welding process and final penetration state as plasmoid, focal position, focus error and workpiece deformation etc., only be difficult to guarantee to obtain uniform and stable appearance of weld, defective such as be easy to produce or burn lack of penetration by fixing welding conditions.
Therefore, machining state is carried out on-line real time monitoring and become the key that guarantees the Laser Processing quality.The light radiation that utilizes the generations such as aperture, plasma or molten bath in photoelectricity and the vision sensor monitoring laser processing procedure is one of important method of laser processing procedure monitoring in real time.Because the power of the plasma signal in the monitor signal is decided by the temperature and the volume of plasma; And the fusion penetration that welds (cutting) is decided by the degree of depth of " aperture ", and the material steam in " aperture " is the source of plasma just.Therefore, whether the reflection that has or not of plasma signal has " aperture " to form under the certain condition, and the intensity of signal has then reflected the size of fusion penetration.The intensity of infrared signal is decided by the Temperature Distribution and the surface area in molten bath, and bath temperature distribution and surface area are determining the shape of following weld seam.At the back of work sensor installation is a kind of method that is easier to implementation procedure monitoring, but since in most cases back side sensor be difficult to servo-actuated, this method is used limited in engineering is produced.The method of monitoring in the face of plasma or aperture from the workpiece upper side is also arranged, but because of can't directly observing the light radiation information of aperture inside, and can not be used for the laser processing procedure of two and three dimensions.Therefore from processing positive particularly aperture top plasma, the molten bath state of aperture inside and top being monitored, extract the characteristic signal of reflection machining state, is to realize the three-dimensional laser process important prerequisite of monitoring in real time.And existing coaxial monitoring technology is only from a kind of radiant light of the molten bath coaxial collection analysis in top, and collection analysis molten bath or plasma resonance light simultaneously cause difficulty, narrow application range to accurate judgement welding and cut quality.The present invention a kind ofly utilizes coaxial checkout gear to gather and analyze the molten bath directly over laser and the material effects zone simultaneously and a kind of method that two kinds of signals of plasma resonance carry out the process monitoring, can overcome the shortcoming of prior art, can be used for the two and three dimensions laser processing procedure, and adaptability is good, reliability is high.
Summary of the invention
The present invention is directed to the defective of above-mentioned said prior art, proposed a kind of coaxial collection infrared band of process such as three-dimensional laser welding and cutting and real-time quality monitoring device of plasma resonance optical signal of can be used for.
The real-time monitoring device of a kind of three-dimensional laser welding and cutting process is characterized in that:
The leaded light mirror be positioned at the Reciprocity of Laser ﹠ Materials zone directly over, be used to obtain molten bath infra-red radiation and plasma resonance optical signal;
Spectroscope and leaded light mirror are positioned on the same light path, be used to accept the light of coming from the leaded light mirroring, wherein infra-red radiation light transmission spectroscope exposes to infrared focus lamp, and infrared photoelectric sensor is positioned at the focus place of infrared focus lamp, be used to receive the infra-red radiation optical signal, and be converted into the signal of telecommunication; The plasma optical signal is reflected by spectroscope, exposes to the plasma focus mirror, and the plasma photoelectric sensor is positioned at the focus place of plasma focus mirror, is used to receive the plasma resonance optical signal, and is converted into the signal of telecommunication;
Modulate circuit links to each other with infrared band radiant light electric transducer with the plasma photoelectric sensor respectively, computer and modulate circuit are in succession, the photosignal that modulate circuit reception plasma photoelectric sensor and infrared band radiant light electric transducer send, amplify with filtering after send computer to and carry out Treatment Analysis, obtain the quality information of laser processing procedure.
This device is by the infrared band radiant light of spectroscope transmission, focus in the photoelectric sensor of gathering the infrared band radiant light through infrared focus lamp, the plasma resonance light of reflection focuses in the photoelectric sensor of gathering plasma resonance light through the plasma focus mirror, is input to after the signal that produces in infrared photoelectric sensor and the plasma photoelectric sensor amplifies by modulate circuit and carries out analyzing and processing in the computer.
Utilize coaxial checkout gear of the present invention, provide a kind of in various three-dimensional laser process, as welding, cutting, punching etc., can realize real-time quality-monitoring and provide more accurate information to reach the automation control of whole process for closed-loop control in the three-dimensional laser process.
Its main advantages of the present invention has:
(1) coaxial detection process signal has been realized the monitoring of three-dimensional laser process and quality;
(2) monitor the infrared band radiant light of reflection molten bath state in the laser processing procedure and two kinds of optical signals of plasma resonance light of reflection aperture state simultaneously;
(3) in the process of laser weld and laser cutting, can accurately detect the state that penetrates of aperture inside, be easy to obtain the information of complete penetration;
(4) on the response speed when signal changes to welded condition, reflect the variation of welded condition more delicately, might realize penetration monitoring and control.
Description of drawings
The real-time quality testing embodiment of Laser Processing schematic diagram,
Fig. 1: three-dimensional laser welding and the coaxial monitoring device schematic diagram of cutting process.
Fig. 2: main box assembling schematic diagram.
Fig. 3: side box body assembling schematic diagram.
Fig. 4: connecting plate schematic diagram.
Fig. 5: be used for the infrared photoelectric sensor clamping tube schematic diagram that the infrared band radiant light is gathered.
Fig. 6: the photoelectric sensor clamping tube schematic diagram that is used for the plasma resonance light collection.
The specific embodiment
Explain the specific embodiment of the present utility model below in conjunction with accompanying drawing:
Figure 1 shows that three-dimensional laser welding and the coaxial monitoring device schematic diagram of cutting process, leaded light mirror 1 is fixed on the first eyeglass bearing 13 by the first eyeglass pressure ring 12, and the first eyeglass bearing 13 is fixed in the main box 8.Laser condensing lens 9 is fixed in the mechanical device of nozzle top.Spectroscope 2 is fixed on the second eyeglass bearing 15 by the second eyeglass pressure ring 14, and the second eyeglass bearing 15 is fixed in the side box body 4.Connecting plate 3 connects the main box 8 in left side and the side box body 4 on right side.The infrared photoelectric sensor clamping tube 5 that is used to gather the infrared band radiant light is used to gather the photoelectric sensor clamping tube 6 of plasma resonance light by the flange that is bolted to side box body 4 belows by the flange that is bolted to side box body 4 right sides.The signal that infrared photoelectric sensor 19 and plasma photoelectric sensor 26 produce is transferred to modulate circuit 10 by optical cable, and auxiliary sonic transducer 7 links to each other with modulate circuit 10, and the information of extraction can further increase the reliability of system monitoring.Signal is imported computer 11 again and is carried out Treatment Analysis after modulate circuit 10 amplifies, obtain the quality information of laser processing procedure.
Fig. 2 further describes main box 8 assembly structures, and leaded light mirror 1 is fixed on the first eyeglass bearing 13 by the first eyeglass pressure ring 12, and the first eyeglass pressure ring 12 has the thread helix face, with 13 matches of the first eyeglass bearing; The first eyeglass bearing 13 is a three-legged structure, and leaded light mirror 1 is placed at the middle part, inclined-plane, and there is the circular hole of a corresponding size at the vertical plane middle part, and respectively there is a symmetrical boss horizontal plane both sides, with main box 8 below grooves on two sides matches.
Fig. 3 represents side box body 4 assembly structures, and the spectroscope 2 usefulness second eyeglass pressure ring 14 is fixed on the second eyeglass bearing 15, and the second eyeglass pressure ring 14 has the thread helix face, with 15 matches of the second eyeglass bearing; The second eyeglass bearing 15 is a three-legged structure, and spectroscope 2 is placed at the middle part, inclined-plane, and there is the aperture of a corresponding size at the vertical plane middle part, and respectively there is a symmetrical boss horizontal plane both sides, with side box body 4 top grooves on two sides matches.Respectively there is a flange side box body 4 right sides and below, and be fluted on the flange, and infrared photoelectric sensor clamping tube 5 and plasma photoelectric sensor clamping tube 6 install in groove respectively by bolt, and can move horizontally along axis 20mm.
Fig. 4 represents connecting plate 3 structures, and right figure is the connecting plate side view, and the below screwed hole is connected with side box body 4 by screw, and the vertical plane screwed hole is connected with main box 8 by screw.
Fig. 5 represents to be used for infrared photoelectric sensor clamping tube 5 structures that the infrared band radiant light is gathered, infrared focus lamp 18 is fixed in the infrared photoelectric sensor master tube 16 by infrared focus lamp gland 17, infrared photoelectric sensor 19 is fixed in the infrared sensor slide cartridge 20, and infrared sensor slide cartridge 20 can be done moving horizontally along axis 50mm in infrared photoelectric sensor master tube 16.The first main tube go up chuck 21, the first main tube down chuck 22 be connected by bolt with infrared photoelectric sensor master tube 16 threes, the infrared photoelectric sensor clamping tube 5 of composition is by being bolted to the right side of side box body 4.
Fig. 6 represents to be used for photoelectric sensor clamping tube 6 structures of plasma resonance light collection, plasma focus mirror 25 is fixed in the photoelectric sensor master tube 23 by focus lamp gland 24, is used for plasma light signal focus that spectroscope 2 the is reflected back photosurface to plasma photoelectric sensor 26; The plasma resonance optical band that plasma photoelectric sensor 26 receives is 300nm～700nm;
Plasma photoelectric sensor 26 is fixed in the photoelectric sensor slide cartridge 27, and photoelectric sensor slide cartridge 27 can be done moving along axis 50mm in photoelectric sensor master tube 23.The second main tube go up chuck 28, the second main tube down chuck 29 be connected by bolt with photoelectric sensor master tube 23 threes, the plasma photoelectric sensor clamping tube 6 of composition is by being bolted to the below of side box body 4.
In order to realize the real-time quality monitoring method of three-dimensional laser process of the present invention, be with a solid YAG or CO
2Laser instrument and can transmit the light path of laser, and photoelectricity is accepted components and parts, signal preposing signal process circuit and Computer signal acquisition system.
Below in conjunction with the real-time quality monitoring method of instantiation explanation three-dimensional laser process.
The method of real-time of processing of the present invention and quality is as follows:
Laser beam by behind the leaded light mirror through the laser condensing lens focussing force on workpiece, molten bath radiation that produces in the process and plasma resonance light by laser condensing lens to the leaded light mirror, but the radiant light that this leaded light mirror reflector laser zone of action produces, radiant light is mapped to spectroscope through the leaded light mirror reversal, because spectroscope only allows infrared band light to pass through, this part passes through spectroscope by the infrared band radiant light that the laser action zone produces, focus in the photoelectric sensor of gathering the infrared band radiant light through infrared focus lamp, plasma resonance light by the spectroscope reflection focuses in the photoelectric sensor of gathering plasma resonance light through the plasma focus mirror, and the signal of two photoelectric sensor generations amplifies by modulate circuit respectively and handles through being input to computer after the A/D conversion.This coaxial monitoring system can directly detect aperture internal plasma light radiation information.
Claims (3)
1, the real-time monitoring device of a kind of three-dimensional laser welding and cutting process is characterized in that:
Leaded light mirror (1) be positioned at the Reciprocity of Laser ﹠ Materials zone directly over, be used to obtain molten bath infrared radiating light and plasma resonance light;
Spectroscope (2) is positioned on the same light path with leaded light mirror (1), be used for the light that acceptance reflects back from leaded light mirror (1), wherein infra-red radiation light transmission spectroscope (2) exposes to infrared focus lamp (18), infrared photoelectric sensor (19) is positioned at the focus place of infrared focus lamp (18), be used to receive the infra-red radiation optical signal, and be converted into the signal of telecommunication;
The plasma resonance optical signal is exposed to plasma focus mirror (25) by spectroscope (2) reflection, and plasma photoelectric sensor (26) is positioned at the focus place of plasma focus mirror (25), is used to receive the plasma resonance optical signal, and is converted into the signal of telecommunication;
Modulate circuit (10) links to each other with infrared photoelectric sensor (19) with plasma photoelectric sensor (26) respectively, computer (11) and modulate circuit (10) are in succession, the photosignal that modulate circuit (10) reception plasma photoelectric sensor (26) and infrared photoelectric sensor (19) send, amplify with filtering after send computer (11) to and carry out Treatment Analysis, obtain the quality information of laser processing procedure.
2, monitoring device according to claim 1 is characterized in that:
Leaded light mirror (1) is fixed on the first eyeglass bearing (13) by the first eyeglass pressure ring (12), and the first eyeglass bearing (13) is fixed in the main box (8);
Spectroscope (2) is fixed on the second eyeglass bearing (15) with the second eyeglass pressure ring (14), and the second eyeglass bearing (15) is fastened in the side box body (4), and side box body (4) is connected with main box (8) by connecting plate (3);
Plasma focus mirror (25) is installed in the photoelectric sensor master tube (23), is used for the plasma resonance optical signal that spectroscope (2) reflects back is focused on the photosurface of plasma photoelectric sensor (26); The plasma resonance optical band that plasma photoelectric sensor (26) receives is 300nm～700nm;
Infrared focus lamp (18) is installed in the infrared photoelectric sensor master tube (16); Infrared photoelectric sensor (19) is installed in the infrared sensor slide cartridge (20).
3. according to claim 1 or 2 described monitoring devices, it is characterized in that,
The second eyeglass bearing (15) is a three-legged structure, and spectroscope (2) is placed at the middle part, inclined-plane, and there is the circular hole of a corresponding size at the vertical plane middle part, and respectively there is a symmetrical boss horizontal plane both sides, with the grooves on two sides match of side box body (4) top; Side box body (4) is connected by bolt with connecting plate (3), and connecting plate (3) is connected with main box (8) by bolt;
Spectroscope (2) is fixed on the second eyeglass bearing (15) by the second eyeglass pressure ring (14), and the second eyeglass pressure ring (14) has the thread helix face, with second eyeglass bearing (15) match;
Infrared focus lamp (18) is fixed in the infrared photoelectric sensor master tube (16) by infrared focus lamp gland (17), infrared photoelectric sensor (19) is fixed in the infrared sensor slide cartridge (20), and infrared sensor slide cartridge (20) can be done moving along axis 50mm in infrared photoelectric sensor master tube (16); The first main tube goes up that chuck (22) is connected by bolt with infrared photoelectric sensor master tube (16) three under the chuck (21) and the first main tube, and the infrared photoelectric sensor clamping tube (5) of composition is by being bolted to the right side of side box body (4);
Plasma focus mirror (25) is fixed in the photoelectric sensor master tube (23) by focus lamp gland (24), plasma photoelectric sensor (26) is fixed in the photoelectric sensor slide cartridge (27), and photoelectric sensor slide cartridge (27) can be done moving along axis 50mm in photoelectric sensor master tube (23); The second main tube go up chuck (28), the second main tube down chuck (29) be connected by bolt with photoelectric sensor master tube (23) three, the plasma photoelectric sensor clamping tube (6) of composition is by being bolted to the below of side box body (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200710052609 CN100475414C (en) | 2007-06-29 | 2007-06-29 | Real time monitoring device of the three-dimensional laser beam welding and incising process |
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| CN 200710052609 CN100475414C (en) | 2007-06-29 | 2007-06-29 | Real time monitoring device of the three-dimensional laser beam welding and incising process |
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| CN100475414C true CN100475414C (en) | 2009-04-08 |
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Assignee: Wuxi Hanshen Electric Co., Ltd. Assignor: Huazhong University of Science and Technology Contract record no.: 2011320000474 Denomination of invention: Real time monitoring device of the three-dimensional laser beam welding and incising process Granted publication date: 20090408 License type: Exclusive License Open date: 20071205 Record date: 20110401 |
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