Multiband coaxial monitoring device for laser cladding head

Abstract

The utility model belongs to the field of additive manufacturing, and relates to a multiband coaxial monitoring device for a laser cladding head, which comprises a first beam combiner and a multiband beam monitoring device, the multiband light beam monitoring device is of a common lens type or a split lens type; the multi-band light beam monitoring device is arranged on a light path where the multi-band light beam is reflected by the first beam combiner; the multi-band light beam monitoring device is of a common lens type or a split lens type and comprises a first band monitoring device and a second band monitoring device which are sequentially arranged from front to back, wherein the first band monitoring device and the second band monitoring device are provided with light supplement. The utility model provides the multiband coaxial monitoring device for the laser cladding head, which can realize coaxial light source light supplement and can realize monitoring of light beams of different bands.

Description

Technical Field

[0001] The utility model belongs to the field of additive manufacturing and relates to a cladding head monitoring device, in particular to a multi-band coaxial monitoring device for a laser cladding head. Background Art

[0002] At present, with the increasing requirements for automation and intelligence of cladding heads, it is often necessary to monitor formed parts and molten pools through different wavelengths. However, in the existing technology, on the one hand, it is impossible to realize visible light monitoring and infrared monitoring at the same time; on the other hand, for visible light monitoring, there is either no light source for supplementary light, or an external light source is used to supplement the light from the side with a paraxial light source. The former will cause the visible light monitoring screen to be dark due to insufficient brightness of visible light, and even the problem of inability to see local details; and the latter will easily cause uneven lighting, which will cause one side of the monitoring area to be bright and the other side to be dark, resulting in unclear imaging; in addition, the paraxial light source has a harsh working environment and a short service life; in addition, its structure is complex and its external dimensions are large, and it is easy to collide with formed parts, other components inside the equipment, etc., resulting in forming quality problems and even safety accidents. Utility Model Content

[0003] In order to solve the above technical problems existing in the background technology, the utility model provides a multi-band coaxial monitoring device for a laser cladding head, which can realize coaxial light source fill light and can realize light beam monitoring in different bands.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A multi-band coaxial monitoring device for a laser cladding head, characterized in that: the multi-band coaxial monitoring device for the laser cladding head comprises a first beam combining mirror and a multi-band beam monitoring device; the multi-band beam monitoring device is placed on the optical path after being reflected by the first beam combining mirror; the multi-band beam monitoring device is a shared lens type or a split lens type, and the multi-band beam monitoring device comprises a first band monitoring device with fill light and a second band monitoring device which are arranged in sequence from front to back.

[0006] When the above-mentioned multi-band light beam monitoring device is of a shared lens type, the first-band monitoring device with fill light includes a first camera, a coaxial light source and a second beam combining mirror, the second-band monitoring device includes a second camera, and the multi-band light beam monitoring device also includes a lens; the lens is placed between the first beam combining mirror and the second beam combining mirror, the coaxial light source and the first camera are arranged in sequence from front to back on the light path after reflection by the second beam combining mirror; the second camera is arranged on the light path after transmission by the second beam combining mirror.

[0007] When the above-mentioned multi-band light beam monitoring device is a split-lens type, the first-band monitoring device with fill light includes a first camera, a first lens, a coaxial light source and a second beam combining mirror; the second beam combining mirror is arranged on the light path after reflection by the first beam combining mirror; the coaxial light source, the first lens and the first camera are arranged in sequence from front to back on the light path after reflection by the second beam combining mirror; the second-band monitoring device is arranged on the light path after transmission through the second beam combining mirror.

[0008] The second waveband monitoring device comprises a second lens and a second camera which are located on the optical path after being transmitted through the second beam combining mirror in order from front to back.

[0009] The first-band monitoring device with fill light is one group or multiple groups; when the first-band monitoring device with fill light is multiple groups, the multiple groups of first-band monitoring devices with fill light are arranged in sequence from front to back on the optical path after reflection by the first beam combiner.

[0010] The above-mentioned multi-band optical beam monitoring device also includes a front-mounted power detection device and a rear-mounted power detection device; the front-mounted power detection device is arranged on the incident light path incident to the first beam combining mirror; the number of the rear-mounted power detection devices corresponds to the number of the first-band monitoring devices with fill light; the first-band monitoring device with fill light, the rear-mounted power detection device and the second-band monitoring device are arranged from front to back on the optical path after reflection by the first beam combining mirror.

[0011] When the above-mentioned rear-mounted power detection device is a group, the first-band monitoring device with fill light, the rear-mounted power detection device and the second-band monitoring device are arranged in sequence from front to back on the optical path after reflection by the first beam combining mirror; when the above-mentioned rear-mounted power detection device is multiple groups, the first-band monitoring device with fill light and the rear-mounted power detection device are alternately arranged on the optical path after reflection by the first beam combining mirror.

[0012] The above-mentioned front-type power detection device includes a first beam power meter and a first beam splitter; the first beam splitter is arranged on the incident light path incident to the first beam combining mirror; the first beam power meter is arranged on the light path after being reflected by the first beam splitter; the rear-type power detection device includes a second beam power meter and a second beam splitter; the second beam splitter is arranged on the light path after being transmitted by the second beam combining mirror; the second beam power meter is arranged on the light path after being reflected by the second beam splitter.

[0013] The above-mentioned coaxial light source emits visible light; the first-band monitoring device with fill light monitors visible light; and the second-band monitoring device monitors infrared light.

[0014] The above-mentioned coaxial light source emits white light with a wavelength of 400nm to 700nm, green light with a wavelength of 523nm, red light with a wavelength of 650nm or blue light with a wavelength of 450nm; the first band monitoring device with fill light monitors white light with a wavelength of 400nm to 700nm, green light with a wavelength of 523nm, red light with a wavelength of 650nm or blue light with a wavelength of 450nm; the second band monitoring device monitors infrared light with a wavelength of 1250nm to 2500nm.

[0015] The advantages of the utility model are:

[0016] The utility model provides a multi-band coaxial monitoring device for a laser cladding head, which includes a first beam combining mirror and a multi-band beam monitoring device; the multi-band beam monitoring device is placed on the optical path after being reflected by the first beam combining mirror; the multi-band beam monitoring device is a shared lens type or a split lens type, and the multi-band beam monitoring device includes a first band monitoring device with fill light and a second band monitoring device which are sequentially arranged from front to back. The utility model adopts a coaxial light source and more than two beam combining mirrors, which can effectively avoid the above-mentioned shortcomings and deficiencies of the prior art, can realize coaxial light source fill light, can divide the light beam into beams of different bands according to the band, and can realize multi-band coaxial monitoring during the use of the cladding head; at the same time, a beam splitter is adopted to divide the light beam into beams of different powers according to the power, and the low-power beam is power-monitored by a beam power meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a multi-band coaxial monitoring device for a laser cladding head (embodiment 1) provided by the utility model;

[0018] Figure 2 It is a structural schematic diagram of a multi-band coaxial monitoring device for a laser cladding head (Example 2) provided by the utility model;

[0019] Figure 3 It is a structural schematic diagram of a multi-band coaxial monitoring device for a laser cladding head (Example 3) provided by the utility model;

[0020] in:

[0021] 1-optical fiber; 2-optical fiber head; 3-upper protective mirror; 4-collimating mirror; 5-first beam combining mirror; 6-focusing mirror; 7-lower protective mirror; 8-molding part; 9-lens; 10-first camera; 11-second beam combining mirror; 12-coaxial light source; 13-second camera; 14-first lens; 15-second lens; 16-first beam splitter; 17-first beam power meter; 18-second beam splitter; 19-second beam power meter. DETAILED DESCRIPTION

[0022] The utility model provides a multi-band coaxial monitoring device for a laser cladding head, comprising a first beam combining mirror 5 and a multi-band beam monitoring device; the multi-band beam monitoring device is a shared lens type or a split lens type; the multi-band beam monitoring device is placed on the optical path after being reflected by the first beam combining mirror 5. When in use, the utility model is used together with an existing forming light generating device. Exemplarily, the forming light generating device comprises an optical fiber 1, an optical fiber head 2, an upper protective mirror 3, a collimating mirror 4, a focusing mirror 6 and a lower protective mirror 7. The laser beam is input through the optical fiber head 2, passes through the upper protective mirror 3 and the collimating mirror 4 in sequence, reaches the first beam combining mirror 5, transmits the first beam combining mirror 5, and then passes through the focusing mirror 6 and the lower protective mirror 7 in sequence, acts on the surface of the forming part 8, and forms a molten pool. The light waves generated in the molten pool are reflected by the first beam combining mirror 5 and incident on the multi-band beam monitoring device, completing the monitoring of multi-band visible light.

[0023] Embodiment 1:

[0024] See also Figure 1 The multi-band coaxial monitoring device for a laser cladding head provided by the utility model is a shared lens type multi-band beam monitoring device, comprising a lens 9, a first camera 10, a second beam combining mirror 11, a coaxial light source 12 and a second camera 13; the lens 9 is placed between the first beam combining mirror 5 and the second beam combining mirror 11; the coaxial light source 12 and the first camera 10 are arranged in sequence from front to back on the optical path after being reflected by the second beam combining mirror 11; the second camera 13 is arranged on the optical path after being transmitted by the second beam combining mirror 11.

[0025] The coaxial light source 12 emits visible light, preferably, the visible light is white light with a wavelength of 400nm to 700nm, preferably green light of 523nm, red light of 650nm or blue light of 450nm, and the visible light enters and passes through the lens 9 through the reflection of the second beam combiner 11, and acts on a certain area below the lower protective mirror 7 through the reflection of the first beam combiner 5. After the light waves generated by the molten pool and the visible light reflected in a certain area below the protective mirror act on the first beam combiner 5, the visible light, especially the white light with a wavelength of 400nm to 700nm, the green light of 523nm, the red light of 650nm or the blue light of 450nm and the infrared wave, preferably with a wavelength of 1250nm to 2500nm, enters and passes through the lens 9 through the reflection of the first beam combiner 5 and reaches the second beam combiner 11. Among them, visible light, preferably white light with a wavelength of 400nm to 700nm, green light of 523nm, red light of 650nm, and blue light of 450nm, reaches and passes through the coaxial light source 12 through the reflection of the second beam combiner 11, acts on the first camera 10, and realizes visible light monitoring; infrared waves, preferably, with a wavelength of 1250nm to 2500nm, act on the second camera 13 after being transmitted through the second beam combiner 11, and realize infrared light monitoring. The first camera 10 and the second camera 13 share a lens 9. Preferably, the angle between the first beam combiner 5 and the incident laser beam of the optical fiber head 2 is 45°. Preferably, the angle between the second beam combiner 11 and the incident visible light beam of the coaxial light source is 45°, and it is parallel to the first beam combiner 5.

[0026] Embodiment 2:

[0027] See also Figure 2 The multi-band coaxial monitoring device for the laser cladding head provided by the utility model is a split-lens type multi-band beam monitoring device, including a first band monitoring device with fill light and a second band monitoring device respectively arranged on the optical path after reflection by the first beam combining mirror 5.

[0028] The first-band monitoring device with fill light includes a first camera 10, a first lens 14, a coaxial light source 12 and a second beam combiner 11; the second beam combiner 11 is arranged on the optical path after being reflected by the first beam combiner 5; the coaxial light source 12, the first lens 14 and the first camera 10 are arranged in sequence from front to back on the optical path after being reflected by the second beam combiner 11; the second-band monitoring device is arranged on the optical path after being transmitted by the second beam combiner 11. The second-band monitoring device includes a second lens 15 and a second camera 13, which are arranged in sequence from front to back on the optical path after being transmitted by the second beam combiner 11.

[0029] Embodiment three:

[0030] This embodiment is an expansion based on the second embodiment. That is, the first-band monitoring device with fill light is one group or multiple groups; when the first-band monitoring device with fill light is multiple groups, the multiple groups of first-band monitoring devices with fill light are sequentially arranged from front to back on the optical path after reflection by the first beam combiner 5. At this time, the multi-band light beam monitoring device provided by the utility model also includes a front-mounted power detection device and a rear-mounted power detection device; the front-mounted power detection device is arranged on the incident light path incident to the first beam combiner 5; the number of rear-mounted power detection devices corresponds to the number of first-band monitoring devices with fill light; the first-band monitoring device with fill light, the rear-mounted power detection device and the second-band monitoring device are arranged from front to back on the optical path after reflection by the first beam combiner 5.

[0031] When the rear-mounted power detection device is a group, the first-band monitoring device with fill light, the rear-mounted power detection device and the second-band monitoring device are arranged in sequence from front to back on the optical path after reflection by the first beam combining mirror 5; when the rear-mounted power detection device is multiple groups, the first-band monitoring device with fill light and the rear-mounted power detection device are alternately arranged on the optical path after reflection by the first beam combining mirror 5.

[0032] The front-type power detection device includes a first beam power meter 17 and a first beam splitter 16; the first beam splitter 16 is arranged on the incident light path incident to the first beam combining mirror 5; the first beam power meter 17 is arranged on the light path after being reflected by the first beam splitter 16; the rear-type power detection device includes a second beam power meter 19 and a second beam splitter 18; the second beam splitter 18 is arranged on the light path after being transmitted by the second beam combining mirror 11; the second beam power meter 19 is arranged on the light path after being reflected by the second beam splitter 18.

[0033] When this embodiment is used in practice, the laser beam passes through the collimator 4 and reaches the first beam splitter 16 (the transmittance of the first beam splitter 16 is 99.99%, or 99%, etc.), and then reaches the first beam combiner 5 (reflection is 0.01%, or 1%, etc.) and enters the first beam power meter 17.

[0034] The light beam transmitted through the second beam combiner 11 reaches the second beam splitter 18 (the transmittance of the second beam splitter 18 is 99.99%, or 99%, etc.), and the light beam reaching the next beam combiner (reflection 0.01%, or 1%, etc.) enters the second beam power meter 19. Accordingly, illustratively, in this embodiment, there are N-1 coaxial light sources, N beam combiners, M beam splitters, M beam power meters, N lenses, and N cameras. The light beam transmitted through the beam splitter M enters the lens N and the camera N.

[0035] The beam splitter can split the light beam into beams of different powers according to the power, among which the low-power beam is monitored by the beam power meter. The beam combiner can split the light beam into beams of different bands according to the band, and then realize the monitoring of different bands.

[0036] It should be noted that the optical path of the light emitted by the coaxial light source 12 entering the area below the protective mirror is basically the same as the optical path of the reflected light below the protective mirror entering the first camera 10 above the coaxial light source 12, but in opposite directions.

Claims

1. A multi-band coaxial monitoring device for a laser cladding head, characterized in that: The multi-band coaxial monitoring device for the laser cladding head comprises a first beam combining mirror (5) and a multi-band light beam monitoring device; the multi-band light beam monitoring device is placed on the light path after being reflected by the first beam combining mirror (5); the multi-band light beam monitoring device is a shared lens type or a split lens type, and the multi-band light beam monitoring device comprises a first band monitoring device with fill light and a second band monitoring device which are arranged in sequence from front to back.

2. The multi-band coaxial monitoring device for a laser cladding head according to claim 1, characterized in that: When the multi-band light beam monitoring device is of a shared lens type, the first-band light beam monitoring device with fill light comprises a first camera (10), a coaxial light source (12) and a second beam combining mirror (11); the second-band light beam monitoring device comprises a second camera (13); and the multi-band light beam monitoring device further comprises a lens (9); the lens (9) is disposed between the first beam combining mirror (5) and the second beam combining mirror (11); the coaxial light source (12) and the first camera (10) are sequentially disposed from front to back on the light path after being reflected by the second beam combining mirror (11); and the second camera (13) is disposed on the light path after being transmitted by the second beam combining mirror (11).

3. The multi-band coaxial monitoring device for a laser cladding head according to claim 1, characterized in that: When the multi-band light beam monitoring device is of a split lens type, the first-band monitoring device with fill light comprises a first camera (10), a first lens (14), a coaxial light source (12) and a second beam combining mirror (11); the second beam combining mirror (11) is arranged on the light path after being reflected by the first beam combining mirror (5); the coaxial light source (12), the first lens (14) and the first camera (10) are arranged in sequence from front to back on the light path after being reflected by the second beam combining mirror (11); and the second-band monitoring device is arranged on the light path after being transmitted by the second beam combining mirror (11).

4. The multi-band coaxial monitoring device for a laser cladding head according to claim 3, characterized in that: The second waveband monitoring device comprises, from front to back, a second lens (15) and a second camera (13) which are located on the light path after being transmitted through the second beam combining mirror (11).

5. The multi-band coaxial monitoring device for a laser cladding head according to any one of claims 2 to 4, characterized in that: The first waveband monitoring device with fill light is one group or multiple groups; when the first waveband monitoring device with fill light is multiple groups, the multiple groups of the first waveband monitoring device with fill light are arranged in sequence from front to back on the optical path after being reflected by the first beam combining mirror (5).

6. The multi-band coaxial monitoring device for a laser cladding head according to claim 5, characterized in that: The multi-band optical beam monitoring device further comprises a front power detection device and a rear power detection device; the front power detection device is arranged on the incident light path incident on the first beam combining mirror (5); the number of the rear power detection devices corresponds to the number of the first band monitoring devices with fill light; the first band monitoring device with fill light, the rear power detection device and the second band monitoring device are arranged from front to back on the optical path after being reflected by the first beam combining mirror (5).

7. The multi-band coaxial monitoring device for a laser cladding head according to claim 6, characterized in that: When the rear-mounted power detection device is a group, the first band monitoring device with fill light, the rear-mounted power detection device and the second band monitoring device are arranged in sequence from front to back on the optical path after being reflected by the first beam combining mirror (5); When there are multiple groups of rear-mounted power detection devices, the first band monitoring device with fill light and the rear-mounted power detection device are alternately arranged on the optical path after being reflected by the first beam combining mirror (5).

8. The multi-band coaxial monitoring device for a laser cladding head according to claim 7, characterized in that: The front-end power detection device comprises a first beam power meter (17) and a first beam splitter (16); the first beam splitter (16) is arranged on the incident light path incident on the first beam combining mirror (5); the first beam power meter (17) is arranged on the light path after being reflected by the first beam splitter (16); the rear-end power detection device comprises a second beam power meter (19) and a second beam splitter (18); the second beam splitter (18) is arranged on the light path after being transmitted by the second beam combining mirror (11); the second beam power meter (19) is arranged on the light path after being reflected by the second beam splitter (18).

9. The multi-band coaxial monitoring device for a laser cladding head according to claim 8, characterized in that: The coaxial light source (12) emits visible light; the first-band monitoring device with fill light monitors visible light; and the second-band monitoring device monitors infrared light.

10. The multi-band coaxial monitoring device for a laser cladding head according to claim 9, characterized in that: The coaxial light source (12) emits white light with a wavelength of 400nm to 700nm, green light with a wavelength of 523nm, red light with a wavelength of 650nm, or blue light with a wavelength of 450nm; The first wavelength band monitoring device with fill light monitors white light with a wavelength of 400nm to 700nm, green light with a wavelength of 523nm, red light with a wavelength of 650nm or blue light with a wavelength of 450nm; The second wavelength monitoring device monitors infrared light with a wavelength of 1250nm to 2500nm.

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