CN106141426A - A kind of optical imaging system followed the trail of for laser welded seam - Google Patents
A kind of optical imaging system followed the trail of for laser welded seam Download PDFInfo
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- CN106141426A CN106141426A CN201510209415.4A CN201510209415A CN106141426A CN 106141426 A CN106141426 A CN 106141426A CN 201510209415 A CN201510209415 A CN 201510209415A CN 106141426 A CN106141426 A CN 106141426A
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Abstract
The present invention relates to laser welding technology field, disclose a kind of optical imaging system followed the trail of for laser welded seam, including auxiliary laser light source, convex lens, camera, narrow band pass filter, protection eyeglass and condenser lens；Wherein peripheral laser Machining head sends welding laser beam and acts on workpiece through condenser lens, and forms weld seam；Camera and auxiliary laser light source are arranged on the both sides of laser Machining head axis, and both are servo-actuated together with laser Machining head, and the auxiliary laser light beam that auxiliary laser light source sends reflection luminous energy on workpiece is by collected by camera；Narrow band pass filter and protection eyeglass are co-axially located at the front end of camera, and narrow band pass filter is between camera and protection eyeglass；The optical maser wavelength of described auxiliary laser light source output is identical with the band-pass wavelength of narrow band filter slice, and the wavelength of welding laser beam is in the cutoff wavelength region of narrow band pass filter.The present invention can reliably show the weld seam in laser beam welding.
Description
Technical field
The present invention relates to laser welding technology field, in particular, particularly to one for laser
The optical imaging system that weld seam is followed the trail of.
Background technology
Laser welding has the features such as heating surface area is little, processing is flexible compared with traditional welding, should
By scope also expanding day, develop into the welding of more than current multikilowatt from the small-power welding started most.
Laser welding processing machine also by the current lathe of initial plane machining machine development and industrial robot, three
The 3D bonding machine that dimension processing head combines.
In modern industry welding process, in order to ensure the q&r of laser welding, it is right to need
Welding process implements complete monitoring.Control system is sent to after monitored picture is carried out image recognition, by
Servosystem corrects the deviation of actual solder joint and weld seam, improves automatization and the intelligence degree of equipment.
It practice, in laser beam welding, the spark brightness produced due to laser welding is the highest,
CCD camera imaging is only capable of see that spark cannot be distinguished by workpiece and weld seam.If using simple
Optical filter, does not has enough contrasts to distinguish surface of the work and weld seam yet.Therefore, CCD is directly used
Camera is monitored weld seam or adds the method for optical filter at CCD camera leading portion and cannot solve recited above
Problem.
Summary of the invention
Present invention aims to the technical problem that prior art exists, it is provided that a kind of for laser
The optical imaging system that weld seam is followed the trail of, it is possible to the weld seam in reliable display laser beam welding.
In order to solve posed problems above, the technical solution used in the present invention is:
A kind of for laser welded seam follow the trail of optical imaging system, including auxiliary laser light source, convex lens,
Camera, narrow band pass filter, protection eyeglass and condenser lens；Wherein peripheral laser Machining head sends welding
Laser beam acts on workpiece through condenser lens, and forms weld seam；Camera and auxiliary laser light source set
Put the both sides at laser Machining head axis, and both are servo-actuated together with laser Machining head, auxiliary laser light
The auxiliary laser light beam that source sends reflection luminous energy on workpiece is by collected by camera；Narrow band pass filter and guarantor
Protecting lens is co-axially located at the front end of camera, and narrow band pass filter is between camera and protection eyeglass；
The optical maser wavelength of described auxiliary laser light source output is identical with the band-pass wavelength of narrow band filter slice, weldering
The wavelength connecing laser beam is in the cutoff wavelength region of narrow band pass filter.
Described auxiliary laser light source uses semiconductor laser, and the optical maser wavelength of semiconductor laser is
532nm；The output of semiconductor laser is 0～30W continuously adjustabe, and the band of narrow band filter slice leads to
Width is ± band-pass wavelength × 1%.
Described camera uses CCD camera, and long limit resolution is 1000 pixels.
Described protection eyeglass uses parallel plate glass eyeglass.
Compared with prior art, the beneficial effects of the present invention is:
The present invention uses auxiliary laser light source and narrow band pass filter filter, and shown by camera imaging
Show the weld seam in laser beam welding, use narrow band pass filter that welding laser beam is filtered so that it is
Having enough contrasts to distinguish surface of the work and weld seam, its simple in construction, function are reliable and are easily achieved.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the optical imaging system that the present invention follows the trail of for laser welded seam.
Fig. 2 is the partial enlarged drawing of auxiliary laser beam irradiation area of the present invention.
Description of reference numerals: 1-semiconductor laser, 2-convex lens, 3-camera, 4-narrow band pass filter,
5-protection eyeglass, 6-condenser lens, 7-auxiliary laser light beam, 8-weld laser beam, 9-weld seam, 10-
Workpiece, 11-imaging region
Detailed description of the invention
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is more fully retouched
State.Accompanying drawing gives presently preferred embodiments of the present invention.But, the present invention can be different with many
Form realizes, however it is not limited to embodiment described herein.On the contrary, provide these embodiments
Purpose is to make the understanding to the disclosure more thorough comprehensively.
Unless otherwise defined, all of technology used herein and scientific terminology with belong to the present invention's
The implication that those skilled in the art are generally understood that is identical.Institute the most in the description of the invention
The term used is intended merely to describe the purpose of specific embodiment, it is not intended that in limiting the present invention.
Refering to shown in Fig. 1, a kind of optical imaging system followed the trail of for laser welded seam that the present invention provides,
The method that this system uses auxiliary laser light source and narrow band pass filter 4 to filter shows laser beam welding
In weld seam, also include convex lens 2, camera 3, protection eyeglass 5 and condenser lens 6.
Described peripheral laser Machining head (not showing on figure) sends welding laser beam 8 through condenser lens 6
Act on workpiece 10, and form weld seam 9.Camera 3 and auxiliary laser light source with laser Machining head are
Axisymmetrical is arranged, and both to follow laser Machining head the most servo-actuated so that auxiliary laser light source sends
The auxiliary laser light beam 7 reflection luminous energy on workpiece 10 more preferably gathered by camera 3.Narrow band pass filter
4 front ends being arranged on camera 3 camera lens, after being positioned at protection eyeglass 5, i.e. three the most coaxially sets
Put.Protection eyeglass 5 is to prevent in welding process the pollutant such as the granule of splash to narrow band pass filter 4
Pollute and arrange, use conventional parallel plate glass eyeglass, it is possible to be convenient for changing and clean.
In above-mentioned, auxiliary laser light source uses semiconductor laser 1, and in the present embodiment, its wavelength is selected
For 532nm (green glow), output is 0～30W continuously adjustabe.Due to semiconductor laser 1 only
As floor light light source, therefore use multimode semiconductor laser for cost consideration.Narrow-band filtering
Sheet 4 uses film plating process to process, band-pass wavelength λ0For 532nm, bandpass width is ± λ0× 1%.I.e. half
The optical maser wavelength of conductor laser 1 output is identical with the band-pass wavelength of narrow band filter slice 4, both ripples
Length is not limited to above-mentioned 532nm (green glow).
In above-mentioned, camera 3 uses general industry CCD camera, it is contemplated that data transmission bauds, phase
Machine 3 long limit resolution reaches 1000 pixels.
The operation principle of the present invention is as follows:
The light beam that semiconductor laser 1 emits, planoconvex lens 2 forms auxiliary laser light after converging
Bundle 7 is radiated on workpiece about 30mm × 30mm region, provides enough brightness for camera 3 imaging.
Welding laser beam 8 wavelength mostly use 1.06 μm (optical fiber laser and YAG laser wavelength) and
10.6 μm (high power CO2Laser wavelength), it is thus in the cutoff wavelength region of narrow band pass filter 4,
The most veiling glares including spark produced when welding will be filtered out by narrow band filter slice 4,
Only auxiliary laser light beam 7 can obtain imaging clearly on camera 3.Therefore, welding region
Weld seam can obtain blur-free imaging by camera 3 when welding.
As shown in Figure 2, auxiliary laser light beam 7 irradiation area includes solder joint and the welding welded
After weld seam 9 and the gap of workpiece 10 split before welding.Due to workpiece 10 surface in irradiation area
Reflectance lightness exceeds several times than weld seam reflectance lightness, and this imaging region 11 is through camera 3 imaging
There are enough contrasts.Therefore, this optical system followed the trail of for weld seam can clearly show in welding
Weld seam and the departure degree of pad and weld seam.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by upper
Stating the restriction of embodiment, that is made under other any spirit without departing from the present invention and principle changes
Become, modify, substitute, combine, simplify, all should be the substitute mode of equivalence, be included in the present invention
Protection domain within.
Claims (4)
1. the optical imaging system followed the trail of for laser welded seam, it is characterised in that: include that auxiliary swashs
Radiant, convex lens (2), camera (3), narrow band pass filter (4), protection eyeglass (5) and focusing
Lens (6)；Wherein peripheral laser Machining head sends welding laser beam (8) through condenser lens (6) work
It is used on workpiece (10), and forms weld seam (9)；Camera (3) and auxiliary laser light source are arranged on sharp
The both sides of light processing head axis, and both are servo-actuated together with laser Machining head, auxiliary laser light source sends
The auxiliary laser light beam (7) reflection luminous energy on workpiece (10) is gathered by camera (3)；Narrow-band-filter
Sheet (4) and protection eyeglass (5) are co-axially located at the front end of camera (3), narrow band pass filter (4) position
Between camera (3) and protection eyeglass (5)；
The optical maser wavelength of described auxiliary laser light source output is identical with the band-pass wavelength of narrow band filter slice (4),
The wavelength of welding laser beam (8) is in the cutoff wavelength region of narrow band pass filter (4).
The optical imaging system followed the trail of for laser welded seam the most according to claim 1, its feature
It is: described auxiliary laser light source uses semiconductor laser (1), swashing of semiconductor laser (1)
The a length of 532nm of light wave；The output of semiconductor laser (1) is 0～30W continuously adjustabe, arrowband
The bandpass width of filter plate (4) is ± band-pass wavelength × 1%.
The optical imaging system followed the trail of for laser welded seam the most according to claim 1, its feature
It is: described camera (3) uses CCD camera, and long limit resolution is 1000 pixels.
The optical imaging system followed the trail of for laser welded seam the most according to claim 1, its feature
It is: described protection eyeglass (5) uses parallel plate glass eyeglass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510209415.4A CN106141426A (en) | 2015-04-28 | 2015-04-28 | A kind of optical imaging system followed the trail of for laser welded seam |
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| CN201510209415.4A CN106141426A (en) | 2015-04-28 | 2015-04-28 | A kind of optical imaging system followed the trail of for laser welded seam |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106624418A (en) * | 2016-10-20 | 2017-05-10 | 北京工业大学 | Method for monitoring flow of weld pool through characteristic spectral line |
| CN109727802A (en) * | 2017-10-27 | 2019-05-07 | 珠海市惟达电子有限公司 | Push switch and its assemble method |
| CN112719629A (en) * | 2020-12-18 | 2021-04-30 | 苏州科韵激光科技有限公司 | Light source follow-up cutting equipment |
| CN114643448A (en) * | 2022-05-19 | 2022-06-21 | 先富斯技术（武汉）有限公司 | Weld joint feature extraction device and method |
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| EP0490146A2 (en) * | 1990-12-10 | 1992-06-17 | Fried. Krupp AG Hoesch-Krupp | Apparatus for detecting laser machining device height from a workpiece |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106624418A (en) * | 2016-10-20 | 2017-05-10 | 北京工业大学 | Method for monitoring flow of weld pool through characteristic spectral line |
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| CN109727802A (en) * | 2017-10-27 | 2019-05-07 | 珠海市惟达电子有限公司 | Push switch and its assemble method |
| CN112719629A (en) * | 2020-12-18 | 2021-04-30 | 苏州科韵激光科技有限公司 | Light source follow-up cutting equipment |
| CN112719629B (en) * | 2020-12-18 | 2022-03-11 | 苏州科韵激光科技有限公司 | Light source follow-up cutting equipment |
| CN114643448A (en) * | 2022-05-19 | 2022-06-21 | 先富斯技术（武汉）有限公司 | Weld joint feature extraction device and method |
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Application publication date: 20161123 |