Device and method for performing and monitoring a plastic laser transmission welding process
원문보기
IPC분류정보
국가/구분
United States(US) Patent
공개
국제특허분류(IPC7판)
B29C-065/82
B29C-065/16
출원번호
US-0235145
(2012-07-20)
공개번호
US-0150953
(2014-06-05)
우선권정보
DE-102011079739.4 (2011-07-25)
국제출원번호
PCT/EP2012/064244
(2012-07-20)
§371/§102 date
20140127
(20140127)
발명자
/ 주소
Sieben, Manuel
Hertle, Dominik
출원인 / 주소
LPKF LASER & ELECTRONICS AG
인용정보
피인용 횟수 :
0인용 특허 :
0
초록▼
A device and a method for performing and monitoring a plastic laser transmission welding process includes a processing beam source for emitting a processing radiation into a joining zone between two joining members so that a weld seam is formed, a measuring beam source for irradiating a measuring zo
A device and a method for performing and monitoring a plastic laser transmission welding process includes a processing beam source for emitting a processing radiation into a joining zone between two joining members so that a weld seam is formed, a measuring beam source for irradiating a measuring zone with a measuring radiation, a detection unit for detecting the measuring radiation reflected by an interface between the weld seam and its surroundings in the joining members, and an evaluation unit connected to the detection unit for determining the depth position of the interface in the joining members from the detected reflected measuring radiation.
대표청구항▼
1. A device for performing and monitoring a plastic laser transmission welding process, the device comprising: a processing beam source (27) for emitting a processing radiation (26) into a joining zone (1) between two joining members (2, 3) so that a weld seam (4) is formed;a measuring beam source (
1. A device for performing and monitoring a plastic laser transmission welding process, the device comprising: a processing beam source (27) for emitting a processing radiation (26) into a joining zone (1) between two joining members (2, 3) so that a weld seam (4) is formed;a measuring beam source (6) for irradiating a measuring zone (12) with a measuring radiation (7);a detection unit (13) for detecting the measuring radiation (7) reflected by an interface (5) between the weld seam (4) and its surroundings in the joining members (2, 3); andan evaluation unit (15) which is connected to the detection unit (13) for determining a depth position of the interface (5) in the joining members (2, 3) from the measuring radiation (7) which is reflected and detected by the detection unit (13). 2. The device according to claim 1, wherein the measuring beam source (6) is a point light source which is variably focusable onto the measuring zone (12) by means of a focusing optical system (11) arranged in a beam path of the measuring beam (7), wherein a photo detector (18) serving as detection unit detects an intensity of the reflected measuring beam (7) as a function of the position of a focus (20) relative to the interface (5). 3. The device according to claim 2, the focusing optical system (11) is arranged so as to be displaceable in a direction of the optical axis for intensity-controlled adjustment of the focus (20) of the measuring beam relative to the interface (5), wherein the depth position of the interface (5) is determinable from a position of the focusing optical system (11). 4. The device according to claim 1, wherein the measuring beam source (6) is a polychromatic point light source which is focusable, by means of a high-dispersion focusing optical system arranged in beam path of the measuring beam (7), onto the measuring zone (12) so as to be distance-coded depending on a respective wavelength, wherein a spectral-sensitive photo detector (18) serving as detection unit detects the reflected partial measuring beam (7) with the highest intensity depending on the position of the focus (20) relative to the interface (5) so as to determine the depth position of the interface (5). 5. The device according to claim 4, wherein the focusing optical system (11) has a focusing lens (16) and a distance coding lens (17). 6. The device according to claim 5, the spectral-sensitive photo detector (18) is formed by a spectrometer with an aperture (9) arranged in front thereof. 7. The device according to claim 5, wherein the measuring beam (7) is guided to the focusing optical system (11) and the reflected measuring beam (7) is guided to the detection unit (13) by in each case one optical waveguide (25) which are combined by a fiber coupler (23) to form a common beam path in the focusing optical system (11) and the measuring zone (12). 8. The device according to claim 1, wherein the measuring beam source (6) and the detection unit (13) are arranged relative to each other in a triangulation arrangement. 9. The device according to claim 1, further comprising a light section sensor (30) comprising the measuring beam source (6) and the detection unit (13), the measuring beam source (6) configured in such a way that the measuring beam source projects a measuring light line (33) onto the measuring zone (12), and an imaging optical system (24) for imaging a reflected image of the measuring light line (33) onto an image sensor serving as detection unit (13). 10. The device according to claim 1, wherein the measuring beam source (6) is a secondary beam source of a device for laser beam hybrid welding. 11. A method for performing and monitoring a plastic laser transmission welding process, comprising the following steps: arranging a transmissive (2) and an absorptive joining member (3) in a joining position;irradiating the joining members (2, 3) in a joining zone (1) with a processing radiation (27) so that a weld seam (4) is formed and in a measuring zone (12) comprising the weld seam (4) with a measuring radiation (7);detecting the measuring radiation (7) reflected by an interface (5) between the weld seam (4) and its surroundings by means of a detection unit (13); andevaluating of the detected measuring radiation (7) by means of an evaluation unit (15) connected to the detection unit (13) so as to determine a depth position of the detected interface (5) in the joining members (2, 3). 12. The method according to claim 12, wherein the measuring radiation (7) is generated by a point light source (6) which is variably focusable by means of a focusing optical system (11), wherein the depth position of the interface (5) is determined by means of a position (P1, P2, P3) of the focusing optical system (11) that is correlated with an intensity of the reflected measuring radiation (7). 13. The method according to claim 12, wherein the measuring radiation (7) is generated by a polychromatic point light source (6) and emitted into the measuring zone (12) with a focus that is a function of the respective wavelength, wherein the measuring radiation (7), which is reflected as a function of the depth position of the interface, is spectrally detected, and the depth position of the interface (5) is determined by evaluation of a spectral intensity maximum of the reflected measuring radiation (7). 14. The method according to claim 12, wherein the measuring radiation (7) is formed by a triangulation laser beam which is emitted into the measuring zone (12), wherein the measuring radiation (7) thereof, which is reflected as a function of the depth position of the interface (5), is detected by an image sensor (29) serving as detection unit and the depth position of the interface (5) is determined according to the principles of laser triangulation. 15. A method according to claim 12, wherein the measuring radiation (7) is formed in such a way that the measuring radiation (7) generates a measuring light line (33) that is projected onto the interface (5), wherein the reflected measuring image thereof is detected as reflected measuring radiation (7) by a light section sensor (30) serving as detection unit, and the depth position of the interface (5) is determined from said reflected measuring radiation (7) according to the principles of the light section method. 16. The method according to claim 12, wherein the measuring zone (12) is irradiated with a secondary radiation generated during laser beam hybrid welding. 17. The device according to claim 5, wherein the distance coding lens (17) is configured as a Fresnel lens.
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