CN106338337A - Apparatus for carrying out on-line monitoring on punching quality during laser punching and monitoring method thereof - Google Patents
Apparatus for carrying out on-line monitoring on punching quality during laser punching and monitoring method thereof Download PDFInfo
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- CN106338337A CN106338337A CN201610997550.4A CN201610997550A CN106338337A CN 106338337 A CN106338337 A CN 106338337A CN 201610997550 A CN201610997550 A CN 201610997550A CN 106338337 A CN106338337 A CN 106338337A
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- Prior art keywords
- laser
- pulse
- vocal print
- hole
- workpiece
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Classifications
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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
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
- B23K26/382—Removing material by boring or cutting by boring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
Abstract
The invention discloses an apparatus for carrying out on-line monitoring on a punching quality during laser punching and a monitoring method thereof. The apparatus is composed of a pulse laser, a beam shaping system, a workpiece, a high-sensitivity microphone, an oscilloscope, data lines and an industrial personal computer. The industrial personal computer is connected with the pulse laser and the oscilloscope by data lines respectively; the high-sensitivity microphone is connected with the oscilloscope by a data line; and the pulse laser faces the beam shaping system. When the pulse laser works, a laser beam emitted by the pulse laser is shaped by the beam shaping system and radiates the workpiece. According to the invention, counting of the laser pulse number needed by the punching process is carried out; and the counted laser pulse number is compared with a standard sample, thereby realizing real-time monitoring of the punching quality. With the apparatus and method, the punching quality can be determined; the cost is low; and the precision is high.
Description
Technical field
The present invention relates to technical field of laser processing, the dress of on-line monitoring drilling quality in more particularly, to a kind of laser boring
Put and its monitoring method.
Background technology
Laser drilling is laser in one of earliest application technology of material processing field.Laser boring is punched with other
Method compare have punching aspect ratio big, contactless, no tool loss, process velocity is fast, areal deformation is little, it is various to process
The notable superiority such as material, can meet the requirement of Modern Industry Products processing well, be widely used in Aero-Space, electronics
In the key components and parts of the high-precision highly sophisticated products such as table and medicine equipment, such as laser processing technology is applied to process in aero-engine
Up to 104 Cooling Holes.
In laser drilling process, the pulse laser focusing of high-energy, in surface of the work, makes material heat, melts even vapour
Change, under the kickback pressure that subsequent metal vapors drastically expands and high pressure auxiliary gas pressure collective effect, melted material is extruded
Outside hole, follow-up pulse laser continues said process, and material constantly removes until forming blind hole or through hole.
When the workpiece larger to thickness carries out laser boring, change laser boring parameter such as laser power, laser frequency, swash
Light pulsewidth, spot size, defocusing amount, punching time, auxiliary gas etc. are all by the quality of impact laser boring, inappropriate punching
Parameter, it will lead to aperture irregular, or even produce the defects such as the lopsided hole of cydariform.However, commenting for quality of laser drilling
Valency, hole is typically cut open and is detected by conventional method, and this is obviously not suitable for industrialization product is detected, therefore,
Line monitoring drilling quality is necessary.
Content of the invention
The present invention seeks to: the device of on-line monitoring drilling quality and its monitoring method in a kind of laser boring are provided, lead to
Crossing the vocal print feature obtaining in drill process, and analysed and compared, thus monitoring whole laser drilling process, evaluating punching matter
Amount.
A kind of technical scheme of the present invention is: the device of on-line monitoring drilling quality in a kind of laser boring, including pulse
Laser instrument, beam shaping system, workpiece, high sensitivity microphone, oscillograph, data wire and industrial computer, described industrial computer passes through
Data wire is connected with pulse laser and oscillograph respectively, and described high sensitivity microphone is connected with oscillograph by data wire,
, just to beam shaping system, during pulse laser work, the laser beam that pulse laser sends is through light beam for described pulse laser
After orthopedic systems shaping, irradiation is to workpiece.
Another kind of technical scheme of the present invention is: a kind of method of on-line monitoring drilling quality in laser boring, including with
Lower step:
Step one: the laser boring technological parameter that acquisition optimizes, acquisition perforating efficiency is high, pore cross section quality is good, satisfaction adds
The technological parameter that work requires, and using the downhole parameter optimizing, laser boring is carried out to workpiece, until this hole is punched, by Gao Ling
Sensitivity microphone obtains the audio signal of whole drill process, and these audio signals are passed through data line transfer to oscillograph,
Audio signal, after oscillograph filtering, obtains the vocal print feature of laser drilling process, vocal print feature is stored in industrial computer；
Step 2: repeat step one, obtain 10 groups of vocal print samples, by vocal print sample to the laser punched needed for each hole
Umber of pulse is counted, and removes highest umber of pulse and minimum umber of pulse in counting, takes the laser needed for remaining 8 groups of vocal print samples
The mean value n of umber of pulse.
Step 3: laser boring is carried out to workpiece using the optimization laser boring parameter obtaining in step one, by Gao Ling
Sensitivity microphone obtains the audio signal of whole drill process, and these audio signals are passed through data line transfer to oscillograph,
Audio signal, after oscillograph filtering, obtains the vocal print feature of whole laser drilling process, by vocal print sample to punching this hole
Required laser pulse number carries out counting n1, if ξ is 1*n≤n1≤ξ 2*n, judge the up-to-standard of this hole, otherwise, then judge
This hole off quality, wherein, ξ 1 and ξ 2 be quality coefficient, 0.95 < ξ 1 < 1,1 < ξ 2 < 1.1.Thickness is different, and workpiece material is not
With then quality coefficient is also different.
The operation principle of the present invention is: carries out the larger workpiece of thickness using pulse laser and is punched, to same thickness
Workpiece for, when drilling quality is stablized, required laser pulse number is essentially identical, if punching the laser pulse needed for workpiece
Number exceedes a certain numerical value or is less than a certain numerical value, all thinks that drill process there is a problem, if punching laser pulse needed for hole
Number is very few, then being likely due to greatly very much blast hole makes drill process terminate in advance, however, aperture can be very big, drilling quality is discontented with
Foot requires；If it is excessive to punch laser pulse number needed for hole, there is a strong possibility is because in drill process, motlten metal cannot be suitable
Profit is discharged, and can lead to the generation of the defective hole such as " drum hole ", " askew hole ".
The invention has the advantage that the present invention is by counting to the laser pulse number needed for drill process, and and standard
Sample is compared, can be with monitor in real time drilling quality；Drilling quality, low cost, high precision are judged using the present invention.
Brief description
Below in conjunction with the accompanying drawings and embodiment the invention will be further described:
Fig. 1 is structural representation in the present invention.
Wherein: 1 pulse laser；2 laser beams；3 beam shaping systems；4 workpiece；5 high sensitivity microphones；6 oscillographs；
7 data wires；8 industrial computers.
Specific embodiment
The embodiment of the device of on-line monitoring drilling quality in a kind of laser boring: as shown in figure 1, it includes pulse laser
Device 1, beam shaping system 3, workpiece 4, high sensitivity microphone 5, oscillograph 6, data wire 7 and industrial computer 8, described industrial computer 8
It is connected with pulse laser 1 and oscillograph 6 respectively by data wire 7, described high sensitivity microphone 5 passes through data wire 7 and shows
Ripple device 6 is connected, and just to beam shaping system 3, during pulse laser 1 work, pulse laser 1 sends described pulse laser 1
Laser beam 2 after beam shaping system 3 shaping irradiation to workpiece 4.The present invention fast and effectively can detect quality of laser drilling,
Can be applicable to on-line checking quality of laser drilling.
The specific embodiment one of the method for on-line monitoring drilling quality in a kind of laser boring:
In the present embodiment, workpiece 4 material is tc4 titanium alloy, and thickness is 3mm；The technical parameter of pulse laser 1 is as follows: arteries and veins
A width of 100ns～500ms is adjustable, and highest repetition rate is 10mhz, peak power 400w, and light distribution is Gaussian, is originally real
The target applying example is to obtain a diameter of 200 μm of through hole on tc4 titanium alloy workpiece 4, for the thick tc4 titanium alloy of 3mm,
Quality coefficient ξ 1=0.99, ξ 2=1.02.
Implement specifically comprising the following steps that of the present invention
Step one: the laser boring parameter of optimization is as follows: pulsewidth is 100 μ s, repetition rate is 2000hz, power 400w,
Oxygen assists, and carries out laser boring using these parameters to tc4 titanium alloy workpiece 4, until this hole is punched, by high sensitivity wheat
Gram wind 5 obtains the audio signal of whole drill process, and these audio signals are transferred to oscillograph 6, audio frequency by data wire 7
Signal, after oscillograph 6 filtering, obtains the vocal print feature of laser drilling process, vocal print feature is stored in industrial computer 8.
Step 2: repeat step one, obtain 10 groups of vocal print samples, by vocal print sample to the laser punched needed for each hole
Umber of pulse is counted, and the umber of pulse that this 10 groups of vocal print samples are punched needed for tc4 titanium alloy workpiece 4 is respectively as follows: 7085,7114,
7093,7155,7095,7091,7056,7107,7102,7097, remove highest umber of pulse 7155 and minimum umber of pulse in counting
7056, the mean value taking the laser pulse number needed for remaining 8 groups of vocal print samples is 7098, then the qualified scope of drilling quality is
7027～7240.
Step 3: using pulsewidth be 100 μ s, repetition rate be 2000hz, power 400w, oxygen assist, to tc4 titanium alloy
Workpiece 4 carries out laser boring, obtains the audio signal of whole drill process by high sensitivity microphone 5, and by these audio frequency
Signal is transferred to oscillograph 6 by data wire 7, and audio signal, after oscillograph 6 filtering, obtains the sound of whole laser drilling process
Line feature, is counted to the laser pulse number punched needed for this hole by vocal print sample, punches the umber of pulse needed for this hole and is
7147, between 7027～7240, then it is considered that this hole is up-to-standard.Through cuing open hole inspection, this hole quality meets requirement.
The specific embodiment two of the method for on-line monitoring drilling quality in a kind of laser boring:
In the present embodiment, workpiece 4 material is tc4 titanium alloy, and thickness is 3mm；The technical parameter of pulse laser 1 is as follows: arteries and veins
A width of 100ns～500ms is adjustable, and highest repetition rate is 10mhz, peak power 400w, and light distribution is Gaussian, is originally real
The target applying example is to obtain a diameter of 200 μm of through hole on tc4 titanium alloy workpiece 4, for the thick tc4 titanium alloy of 3mm,
Quality coefficient ξ 1=0.99, ξ 2=1.02.
Implement specifically comprising the following steps that of the present embodiment
Step one, the laser boring parameter of optimization is as follows: pulsewidth is 100 μ s, and repetition rate is 2000hz, power 400w,
Oxygen assists, and carries out laser boring using these parameters to tc4 titanium alloy workpiece 4, until this hole is punched, by high sensitivity wheat
Gram wind 5 obtains the audio signal of whole drill process, and these audio signals are transferred to oscillograph 6, audio frequency by data wire 7
Signal, after oscillograph 6 filtering, obtains the vocal print feature of laser drilling process, vocal print feature is stored in industrial computer 8.
Step 2, repeat step one, obtain 10 groups of vocal print samples, by vocal print sample to the laser punched needed for each hole
Umber of pulse is counted, and the umber of pulse that this 10 groups of vocal print samples are punched needed for tc4 titanium alloy workpiece 4 is respectively as follows: 7085,7114,
7093,7155,7095,7091,7056,7107,7102,7097, remove highest umber of pulse 7155 and minimum umber of pulse in counting
7056, the mean value taking the laser pulse number needed for remaining 8 groups of vocal print samples is 7098, then the qualified scope of drilling quality is
7027～7240.
Step 3: using pulsewidth be 100 μ s, repetition rate be 2000hz, power 400w, oxygen assist, to tc4 titanium alloy
Workpiece 4 carries out laser boring, obtains the audio signal of whole drill process by high sensitivity microphone 5, and by these audio frequency
Signal is transferred to oscillograph 6 by data wire 7, and audio signal, after oscillograph 6 filtering, obtains the sound of whole laser drilling process
Line feature, is counted to the laser pulse number punched needed for this hole by vocal print sample, punches the umber of pulse needed for this hole and is
7347, then it is assumed that this hole is off quality outside 7027～7240, through cuing open hole inspection, find that this hole occurs in that " askew hole " lacks
Fall into.
In sum, the present invention fast and effectively can detect quality of laser drilling, solves the inspection of laser boring mesopore quality
Survey a difficult difficult problem.
The above is only the concrete application example of the present invention, protection scope of the present invention is not limited in any way.Except above-mentioned
Implement exception, the present invention can also have other embodiment.All employing equivalents or the technical scheme of equivalent transformation formation, all
Fall within scope of the present invention.
Claims (3)
1. in a kind of laser boring on-line monitoring drilling quality device it is characterised in that: include pulse laser (1), light beam
Orthopedic systems (3), workpiece (4), high sensitivity microphone (5), oscillograph (6), data wire (7) and industrial computer (8), described industry control
Machine (8) is connected with pulse laser (1) and oscillograph (6) respectively by data wire (7), and described high sensitivity microphone (5) is led to
Cross data wire (7) to be connected with oscillograph (6), described pulse laser (1) is just to beam shaping system (3), pulse laser (1)
During work, laser beam (2) that pulse laser (1) sends after beam shaping system (3) shaping irradiation to workpiece (4).
2. in a kind of laser boring on-line monitoring drilling quality method, comprise the following steps:
Step one: obtain the laser boring technological parameter optimizing, obtain perforating efficiency height, pore cross section quality is good, meeting processing will
The technological parameter asked, and using the downhole parameter optimizing, laser boring is carried out to workpiece (4), until this hole is punched, by Gao Ling
Sensitivity microphone (5) obtains the audio signal of whole drill process, and these audio signals are transferred to by data wire (7) show
Ripple device (6), audio signal, after oscillograph (6) filtering, obtains the vocal print feature of laser drilling process, vocal print feature is stored in
In industrial computer (8)；
Step 2: repeat step one, obtain 10 groups of vocal print samples, by vocal print sample to the laser pulse punched needed for each hole
Number is counted, and removes highest umber of pulse and minimum umber of pulse in counting, takes the laser pulse needed for remaining 8 groups of vocal print samples
The mean value n of number.
Step 3: laser boring is carried out to workpiece (4) using the optimization laser boring parameter obtaining in step one, by highly sensitive
Degree microphone (5) obtains the audio signal of whole drill process, and these audio signals are transferred to oscillography by data wire (7)
Device (6), audio signal, after oscillograph (6) filtering, obtains the vocal print feature of whole laser drilling process, by vocal print sample pair
Punch the laser pulse number needed for this hole to carry out counting n1, if ξ is 1*n≤n1≤ξ 2*n, judge the up-to-standard of this hole, and no
Then, then judge the off quality of this hole, wherein, ξ 1 and ξ 2 is quality coefficient.
3. in a kind of laser boring according to claim 2 on-line monitoring drilling quality method it is characterised in that: above-mentioned
In step 3,0.95 < ξ 1 < 1,1 < ξ 2 < 1.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610997550.4A CN106338337A (en) | 2016-11-11 | 2016-11-11 | Apparatus for carrying out on-line monitoring on punching quality during laser punching and monitoring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610997550.4A CN106338337A (en) | 2016-11-11 | 2016-11-11 | Apparatus for carrying out on-line monitoring on punching quality during laser punching and monitoring method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218317A (en) * | 2021-04-23 | 2021-08-06 | 长春理工大学 | In-situ detection method in laser in-situ pressure head coining workpiece pore-forming process |
| CN113814586A (en) * | 2021-11-05 | 2021-12-21 | 泰尔重工股份有限公司 | Method for judging puncture state of laser cutting machine based on sound signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218317A (en) * | 2021-04-23 | 2021-08-06 | 长春理工大学 | In-situ detection method in laser in-situ pressure head coining workpiece pore-forming process |
| CN113814586A (en) * | 2021-11-05 | 2021-12-21 | 泰尔重工股份有限公司 | Method for judging puncture state of laser cutting machine based on sound signal |
| CN113814586B (en) * | 2021-11-05 | 2024-04-09 | 泰尔重工股份有限公司 | Method for judging puncture state of laser cutting machine based on sound signal |
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Application publication date: 20170118 |