CN102430859B - Defocusing real time control method for laser welding - Google Patents
Defocusing real time control method for laser welding Download PDFInfo
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- CN102430859B CN102430859B CN201110333808.8A CN201110333808A CN102430859B CN 102430859 B CN102430859 B CN 102430859B CN 201110333808 A CN201110333808 A CN 201110333808A CN 102430859 B CN102430859 B CN 102430859B
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Abstract
The invention provides a defocusing real time control method for laser welding, which is implemented by adding a line source based on a laser welding system. In actual operating process, the angle between the line source and the light path of laser is adjusted. Once the angle is fixed, the light projection of the line source displayed on a screen formed on the surface of a workpiece is superposed with the centre of a cross intersecting line on the screen when the line source is a certain height far from the workpiece by moving a welding joint up and down. Real time control of defocusing in the welding process can be realized according to the theory. The invention efficiently solves the problem of real time monitoring of welding defocusing, in particular the real time monitoring of defocusing of a welding line of a three-dimensional curve.
Description
Technical field
The present invention relates to a kind of defocusing real time control method for laser welding.
Background technology
In laser weld, defocusing amount refers to the distance of laser beam focusing focus with respect to material surface.Focus is positioned at material surface top and is called positive out of focus, and focus is positioned at material surface below (inside) and is called negative out of focus.Defocusing amount butt welded seam shape, fusion penetration and cross-sectional area have considerable influence, for ensureing weldquality, need the strict welding defocusing amount of controlling.The method for supervising of defocusing amount when existing laser weld, mainly comprises the direct method of measurement, tool locating method etc.Wherein the direct method of measurement is to use survey tool as the direct distance of lens to workpiece to be welded of measuring such as slide calliper rule, and tool locating method is according to the frock of the different length of different defocusing amounts making, by the definite defocusing amount of welding of frock length.These two kinds of methods can directly be applied in plate welding, but efficiency is lower, and in the time that weld seam is three-dimensional curve, these two kinds of methods all cannot realize the real-time control of defocusing amount in welding process.
Summary of the invention
The object of the present invention is to provide a kind of defocusing real time control method for laser welding.
The present invention realizes taking laser welding system as basis, by adding line source, the real-time monitoring of the real-time monitoring of high efficiency solution butt welded seam defocusing amount, the particularly defocusing amount of three-dimensional curve weld seam.Laser welding system comprises laser welding system, welding robot, display and coaxial CCD imaging system, and laser focusing lens are installed in laser welding system.In actual mechanical process, adjust line source and laser optical path angle, once this angle is fixing, by moving up and down plumb joint, while only having apart from workpiece certain height, the cross intersection center superposition on ray cast and screen that on screen, shown line source forms at surface of the work.Can realize the real-time control of defocusing amount in welding process according to this principle.
Technical scheme of the present invention is as follows: a kind of defocusing real time control method for laser welding, specifically comprises:
The first step, reconciles laser focusing lens position, makes it in zero out-of-focus appearance;
Second step, reconciles laser weld grease head highness, makes focus be positioned at surface of the work to be welded;
The 3rd step, regulates the cross intersection on display, ensures that display cross intersection center overlaps with laser facula;
The 4th step, adjusts laser weld defocusing amount, makes now plumb joint in required defocusing amount position;
The 5th step, hookup wire light source adjust the position of line source in laser welding system, the light forming at working surface when line source in display is through cross intersection center, static line light source;
The 6th step, when the front teaching of weldering, in the time being plate welding, reconcile laser welding system height, when the become light crossing with surface of the work of line source in display is through cross intersection center, determine this position, then allow laser welding apparatus move path of welding, the defocusing amount situation of change showing according to display regulates laser welding system height in each point place on path of welding, the welding defocusing amount while ensureing welding successively.
The output optical width of described line source is below 0.1mm.
The present invention adopts line space of planes relative position, carries coaxial CCD imaging system in conjunction with laser process equipment, and line of engagement light source can be realized in laser beam welding, and the defocusing amount of space welding track is controlled in real time, thereby controls welding quality effectively quickly.
Detailed description of the invention
Below by example, the present invention is described further, but it should be noted that, publicize and implement routine object and be to help further to understand the present invention, but it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, various substitutions and modifications are all possible.Therefore, the present invention should not be limited to the disclosed content of embodiment, and the scope that the scope of protection of present invention defines with claims is as the criterion.
A kind of defocusing real time control method for laser welding of the present invention comprises:
The first step, reconciles laser focusing lens position, makes it in zero out-of-focus appearance;
Second step, reconciles laser weld grease head highness, makes focus be positioned at surface of the work to be welded;
The 3rd step, regulates the cross intersection on display, ensures that display cross intersection center overlaps with laser facula;
The 4th step, adjusts laser weld defocusing amount, makes now plumb joint in required defocusing amount position;
The 5th step is installed the line source of output optical width below 0.1mm and is adjusted the position of line source in laser welding system, and the light forming at working surface when line source in display is through cross intersection center, static line light source;
The 6th step, when the front teaching of weldering, in the time being plate welding, reconcile laser welding system height, when the become light crossing with surface of the work of line source in display is through cross intersection center, determine this position, then allow laser welding apparatus move path of welding, the defocusing amount situation of change showing according to display regulates laser welding system height in each point place on path of welding, the welding defocusing amount while ensureing welding successively;
In the time that weld seam is measurements of the chest, waist and hips curve, first with many straight lines or circular arc, measurements of the chest, waist and hips curve is carried out to matching according to the method for the poor benefit of linearity, and at each match point place, reconcile laser welding system height, when the become light crossing with surface of the work match point of line source in display is through cross intersection center, determine this position, then allow laser welding apparatus move the path of welding simulating, the defocusing amount situation of change showing according to display regulates laser welding system height in each point place on path of welding, the welding defocusing amount while ensureing welding successively.
Claims (2)
1. a defocusing real time control method for laser welding, is characterized in that, comprises the following steps;
The first step, regulates laser focusing lens position, makes it in zero out-of-focus appearance;
Second step, regulates laser weld grease head highness, makes focus be positioned at surface of the work to be welded;
The 3rd step, regulates the cross intersection on display, ensures that display cross intersection center overlaps with laser facula;
The 4th step, adjusts laser weld defocusing amount, makes now laser welding system in required defocusing amount position;
The 5th step, hookup wire light source adjust the position of line source in laser welding system, the light forming at working surface when line source in display is through cross intersection center, static line light source;
The 6th step, when the front teaching of weldering, regulate laser welding system height, when the become light crossing with surface of the work of line source in display is through cross intersection center, determine this position, then allow laser welding apparatus move path of welding, the defocusing amount situation of change showing according to display regulates laser welding system height in each point place on path of welding, the welding defocusing amount while ensureing welding successively; Or first with many straight lines or circular arc, three-dimensional curve is carried out to matching according to the method for the poor benefit of linearity, and at each match point place, regulate laser welding system height, when the become light crossing with surface of the work match point of line source in display is through cross intersection center, determine this position, then allow laser welding apparatus move the path of welding simulating, the defocusing amount situation of change showing according to display regulates laser welding system height in each point place on path of welding, the welding defocusing amount while ensureing welding successively.
2. defocusing real time control method for laser welding as claimed in claim 1, is characterized in that, in the 5th step, the output optical width of line source is below 0.1mm.
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| CN201110333808.8A CN102430859B (en) | 2011-10-28 | 2011-10-28 | Defocusing real time control method for laser welding |
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| CN201110333808.8A CN102430859B (en) | 2011-10-28 | 2011-10-28 | Defocusing real time control method for laser welding |
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| CN102430859A CN102430859A (en) | 2012-05-02 |
| CN102430859B true CN102430859B (en) | 2014-08-06 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537799A (en) * | 2013-10-29 | 2014-01-29 | 西安炬光科技有限公司 | High-power semiconductor laser focus indicator used for laser processing |
| CN103862166B (en) * | 2014-02-27 | 2015-09-16 | 中国科学院力学研究所 | A kind of defining method of laser beam focal plane |
| CN105750727A (en) * | 2014-12-15 | 2016-07-13 | 湖北三江航天红阳机电有限公司 | Laser beam welding focal length determination device |
| CN104607799A (en) * | 2015-01-30 | 2015-05-13 | 江苏中科四象激光科技有限公司 | Laser welding method for automobile skylight guide rail |
| CN108213776B (en) * | 2016-12-15 | 2019-07-05 | 中国科学院沈阳自动化研究所 | A kind of contactless robotic laser welding teaching method |
| CN113182669A (en) * | 2021-03-23 | 2021-07-30 | 中国船舶重工集团公司第七二五研究所 | Method and device for laser welding position indication |
| CN113604653B (en) * | 2021-08-11 | 2022-04-12 | 山东大学 | Variable-defocusing-amount-based unequal-strength laser shock processing method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2669147B2 (en) * | 1990-11-27 | 1997-10-27 | トヨタ自動車株式会社 | Laser welding apparatus and laser welding method |
| CN101856773A (en) * | 2010-04-22 | 2010-10-13 | 广州中国科学院工业技术研究院 | Focusing positioning method based on initial laser processing position and laser processing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4300783B2 (en) * | 2002-10-09 | 2009-07-22 | パナソニック株式会社 | Processing position teaching method of semiconductor laser device |
| JP2008119718A (en) * | 2006-11-10 | 2008-05-29 | Marubun Corp | Laser beam machining apparatus |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2669147B2 (en) * | 1990-11-27 | 1997-10-27 | トヨタ自動車株式会社 | Laser welding apparatus and laser welding method |
| CN101856773A (en) * | 2010-04-22 | 2010-10-13 | 广州中国科学院工业技术研究院 | Focusing positioning method based on initial laser processing position and laser processing device |
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Address after: 100854 Yongding Road, Beijing, No. 52, No. Applicant after: Beijing Aerospace Xinfeng Machinery Equipment Co., Ltd. Address before: 100854 Yongding Road, Beijing, No. 52, No. Applicant before: Beijing Xinfeng Machinery Factory |
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