CN114083125A

CN114083125A - Laser welding machine device based on annular facula

Info

Publication number: CN114083125A
Application number: CN202111573731.1A
Authority: CN
Inventors: 熊波波; 邹达; 黎凯
Original assignee: Inno Laser Technology Corp ltd
Current assignee: Inno Laser Technology Corp ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-02-25

Abstract

The embodiment of the invention discloses a laser welding machine device based on annular light spots, which comprises a laser, an optical fiber and an optical device, wherein the laser, the optical fiber and the optical device are sequentially connected, the optical fiber comprises an optical fiber core and an optical outer cladding, and the optical outer cladding is arranged on the periphery of the optical fiber core. By implementing the welding machine device provided by the embodiment of the invention, the bad processing phenomena such as splashing, explosion point and the like in laser processing application can be effectively solved, the processing precision and quality are improved, and the effect is good.

Description

Laser welding machine device based on annular facula

Technical Field

The invention relates to the technical field of laser processing, in particular to a laser welding machine device based on annular light spots.

Background

The output of the traditional laser processing fields such as welding, cutting, cladding and the like is Gaussian beams, and the quality, the precision and the like of the laser processing are limited due to the high middle energy and the low edge energy of the Gaussian beams. Compared with the common Gaussian beam, the annular light spot has the advantages that the energy is distributed on the edge annular band, the energy is distributed uniformly, and the problems of splashing, explosion and the like generated in the laser processing process can be effectively solved in the laser processing application, so that the processing precision and quality are improved. Under normal conditions, annular light spots can be generated through modes such as an optical fiber beam combiner, a combined lens and DOE shaping, and the modes are limited by factors such as high device processing difficulty, high light path adjusting precision, high device price and the like, and the effect is often poor.

Therefore, it is necessary to design a new device to effectively solve the undesirable machining phenomena such as splashing and explosion during laser machining application, improve the machining precision and quality, and achieve good effect.

Disclosure of Invention

The invention aims to provide a laser welding machine device based on annular light spots.

In order to solve the technical problems, the invention aims to realize the following technical scheme: the laser welding machine device based on the annular light spot comprises a laser, an optical fiber and an optical device which are connected in sequence, wherein the optical fiber comprises an optical fiber core and an optical outer cladding layer, and the optical outer cladding layer is arranged on the periphery of the optical fiber core.

The further technical scheme is as follows: the optical fiber further comprises an optical cladding, and the optical cladding is arranged between the optical fiber core and the optical outer cladding.

The further technical scheme is as follows: and a coating layer is arranged on the periphery of the optical outer cladding layer.

The further technical scheme is as follows: the fiber core of the optical fiber is made of high-purity quartz or germanium-doped material; the optical cladding layer is made of doped glass material deposited by chemical vapor deposition, the optical cladding layer is made of high-purity quartz material, and the coating layer is made of acrylic resin.

The further technical scheme is as follows: the refractive index of the optical fiber core is greater than the refractive index of the optical cladding.

The further technical scheme is as follows: the optical overcladding has a refractive index greater than a refractive index of the coating layer.

The further technical scheme is as follows: the optical cladding has a refractive index less than a refractive index of the optical cladding.

The further technical scheme is as follows: the optical device comprises a third lens, a galvanometer and a field lens which are connected in sequence.

The further technical scheme is as follows: a first lens and a second lens are sequentially connected between the laser and the optical fiber.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, through arranging the laser, the optical fiber and the optical device which are connected in sequence, the optical fiber comprises the optical fiber core and the optical outer cladding layer, and the annular light spot is generated after the optical device is added, so that the bad processing phenomena such as splashing and explosion point in laser processing application are effectively solved, the processing precision and quality are improved, and the effect is good.

The invention is further described below with reference to the accompanying drawings and specific embodiments.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a laser welder device based on annular light spots according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a Gaussian beam passing through an optical fiber to generate an annular light spot according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an optical fiber according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the refractive index profile of an optical fiber according to an embodiment of the present invention;

the labels in the figures illustrate:

1. a first lens; 2. a second lens; 3. an optical fiber; 4. a third lens; 5. a galvanometer; 6. a field lens; 7. a focal plane; 8. a fiber core; 9. an optical cladding; 10. an optical overclad layer; 11. a coating layer; 12. a laser.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a laser welding machine device based on an annular light spot according to an embodiment of the present invention, the laser welding machine device is used in a laser processing scene for improving a laser micro-welding processing technology, so as to effectively solve the undesirable processing phenomena such as splashing and spot explosion in laser processing application, improve processing accuracy and quality, and achieve a good effect.

Referring to fig. 1, the laser welder device based on annular light spots includes a laser 12, an optical fiber 3 and an optical device connected in sequence, where the optical fiber 3 includes an optical fiber core 8 and an optical outer cladding 10, and the optical outer cladding 10 is disposed on the periphery of the optical fiber core 8.

In this embodiment, output the gaussian beam coupling of laser 12 into the optics surrounding layer 10 of optic fibre 3, export behind the optics surrounding layer 10 of double-clad smooth borer, as shown in fig. 2, annular facula through optic fibre 3 production, the device price is preferential, the light path is adjusted simply, annular facula effect is obvious, just can constitute a set of well-matured laser welder device of annular facula through increasing optical devices such as lens, galvanometer 5, field lens 6 on this basis, can effectively solve all kinds of bad problems in the laser welding processing.

In one embodiment, referring to fig. 3, the optical fiber 3 further includes an optical cladding 9, and the optical cladding 9 is disposed between the optical fiber core 8 and the optical cladding 10.

In one embodiment, referring to fig. 3, the optical cladding 10 is provided with a coating layer 11 on the outer periphery thereof.

In one embodiment, referring to fig. 3, the material of the optical fiber core 8 is high-purity quartz or germanium-doped material; the optical cladding 9 is made of doped glass material deposited by chemical vapor deposition, the optical cladding 10 is made of high-purity quartz material, and the coating layer 11 is made of acrylic resin.

In one embodiment, referring to fig. 4, the refractive index of the optical fiber core 8 is greater than the refractive index of the optical cladding 9.

In one embodiment, referring to FIG. 4, the refractive index of the optical cladding 10 is greater than the refractive index of the coating 11.

In one embodiment, referring to FIG. 4, the refractive index of the optical cladding 9 is less than the refractive index of the optical cladding 10.

The optical fiber 3 is a cylindrical medium optical waveguide composed of a fiber core and a cladding coating layer 11, the fiber core 8 is made of high-purity quartz or germanium-doped material, the optical cladding 9 is made of chemical vapor deposition doped glass material, the optical cladding 10 is made of high-purity quartz material, the coating layer 11 is generally made of acrylic resin, and the refractive index of the fiber core 8 is n 1; the refractive index of the optical cladding 9 is n 2; the optical overclad 10 has an index of refraction n 3; the refractive index of the coating layer 11 is n 4. The refractive index n1 is greater than the refractive index n2, the refractive index n3 is greater than the refractive index n4, as shown in fig. 4, according to the optical waveguide theory, when light enters from the optically dense medium to the optical comb medium and the incident angle is greater than the critical angle, total reflection occurs, and the light propagates in the optically dense medium, in this embodiment, the refractive index n1 > n2, n3 > n4, n1 > n2 < n3 are provided in each region of the optical fiber 3, when the laser beam is coupled into the optical outer cladding 10, the light propagates in the optical outer cladding 10 due to n3 > n4, and the light cannot propagate in the optical cladding 9 due to n2 < n3, and the optical cladding 9 plays a role of light isolation, so that the profile of the generated annular light spot is more distinct.

In an embodiment, referring to fig. 1, the optical device includes a third lens 4, a polarizer 5 and a field lens 6 connected in sequence.

In an embodiment, referring to fig. 1, a first lens 1 and a second lens 2 are sequentially connected between the laser 12 and the optical fiber 3.

The laser 12 emits a Gaussian beam, the Gaussian beam is collimated by the first lens 1 and then focused and coupled into an optical fiber outer cladding layer of the optical fiber 3 through the second lens 2, the optical fiber 3 outputs the beam, the beam is collimated by the third lens 4 and then enters the vibrating lens 5, and the beam is focused by the field lens 6 and then obtains an annular light spot at a focal plane 7.

For example: the first lens 1 is an F50 lens, the second lens 2 is an F50 lens, the third lens 4 is an F120 lens, and the field lens 6 is an F170 field lens 6; the welding machine device consists of a QCW laser 12, an F50 lens, an F50 lens, a 400/440/5600.22 NA optical fiber, an F120 lens, a galvanometer 5, an F170 field lens 6 and a focal plane 7 in sequence. Wherein laser instrument 12 sends multimode or few mode laser beam, and through the collimation of first lens 1, spot size 14um behind the focus of second lens 2, during the coupling advances the optic fibre surrounding layer, 3 output light beam divergence angle NA of optic fibre is 0.1, and spot size 24mm after the collimation of third lens 4, the light beam gets into galvanometer 5, obtains focus annular spot, spot size 623um in focal plane 7 behind field lens 6. Refractive index profile of each region of the optical fiber: n1 > n2, n3 > n4, n1 > n2 < n3, as shown in FIG. 4. When the laser beam is coupled into the optical fiber outer cladding 10, n3 is more than n4, and the beam can propagate in the structure of the optical fiber outer cladding according to the waveguide principle; because n2 is more than n3, n2 is more than n1, light can not propagate in the optical cladding 9 structure according to the waveguide principle, and the optical cladding 9 plays a role of isolating bound light, so that the finally obtained annular light spot is more obvious and the outline is clearer.

Foretell a laser welder device based on annular facula, through setting up laser 12, optic fibre 3 and the optical device who connects according to the preface, optic fibre 3 includes optic fibre core 8 and optics surrounding layer 10, combines to produce annular facula through increasing behind the optical device, realizes effectively solving the laser beam machining and uses and spatter and explode bad processing phenomenon such as some, improves machining precision and quality, and the effect is good.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The laser welding machine device based on the annular light spot is characterized by comprising a laser, an optical fiber and an optical device which are sequentially connected, wherein the optical fiber comprises an optical fiber core and an optical outer cladding layer, and the optical outer cladding layer is arranged on the periphery of the optical fiber core.

2. The apparatus of claim 1, wherein the optical fiber further comprises an optical cladding, and the optical cladding is disposed between the fiber core and the optical cladding.

3. The laser welder device based on annular light spot, according to claim 2, characterized in that the outer periphery of the optical outer cladding is provided with a coating layer.

4. The laser welder device based on the annular light spot is characterized in that the material of the fiber core of the optical fiber is high-purity quartz or germanium-doped material; the optical cladding layer is made of doped glass material deposited by chemical vapor deposition, the optical cladding layer is made of high-purity quartz material, and the coating layer is made of acrylic resin.

5. The laser welder device based on annular light spots according to claim 3, wherein the refractive index of the fiber core is larger than that of the optical cladding.

6. The apparatus of claim 5, wherein the optical cladding layer has a refractive index greater than that of the coating layer.

7. The apparatus of claim 6, wherein the optical cladding has a refractive index less than that of the optical cladding.

8. The laser welder device based on annular light spots as claimed in claim 1, wherein the optical device comprises a third lens, a galvanometer and a field lens connected in sequence.

9. The laser welder device based on annular light spots as claimed in claim 8, wherein a first lens and a second lens are connected between the laser and the optical fiber in sequence.