CN210596258U

CN210596258U - Laser broadband cladding system based on multiple optical fiber output laser modules

Info

Publication number: CN210596258U
Application number: CN201921322713.4U
Authority: CN
Inventors: 方强; 方笑尘
Original assignee: Individual
Current assignee: Fang Qiang
Priority date: 2019-08-14
Filing date: 2019-08-14
Publication date: 2020-05-22
Anticipated expiration: 2029-08-14

Abstract

The utility model discloses a laser broadband cladding system based on a plurality of optical fiber output laser modules, which comprises a feeding device and at least one laser head; each laser head comprises a plurality of optical fiber output laser modules and an imaging lens, the optical fiber output end faces of the optical fiber output laser modules are arranged in a row in one plane, and when the optical fiber output end faces are arranged in a plurality of rows, the rows are parallel to each other to form a strip; the imaging lens comprises at least one lens element and is positioned on an output optical path of the optical fiber output end face of the laser module; the system directly utilizes the low-power module to construct the strip-shaped light spot with a required structure, and each part of the light spot can be independently controlled so that the light spot structure meets different laser processing technological requirements. The conventional optical element is adopted, and the use of a high-power laser is avoided, so that the equipment cost is reduced; the system is simple to debug.

Description

Laser broadband cladding system based on multiple optical fiber output laser modules

Technical Field

The utility model belongs to the technical field of laser, a laser broadband melts and covers device is related to, especially a laser broadband melts and covers system based on a plurality of optic fibre output laser module, but wide application in the laser processing industry.

Background

Laser cladding is the changing of the properties of an object surface by laser sintering of a material, which may be powder, wire, sheet, etc., on the object surface. Laser cladding is generally divided into narrow band cladding and broad band cladding. The narrow-band cladding can only clad 3-5 mm in width, and when the cladding area is large, the number of joints is large, and the surface characteristics are poor. The laser broadband cladding can ensure the cladding efficiency and the cladding quality, and is widely applied to the industry.

The laser broadband cladding is divided into two modes, one mode is that laser vertically irradiates the surface to be clad, and materials are fed from one side or two sides; the other is that the material is sent vertically to the surface to be clad and the laser is irradiated from one or two sides. In order to realize laser broadband cladding, a feeding device and a laser system for generating strip-shaped light spots are needed. At present, two main laser systems for generating strip-shaped light spots are available: one is a direct output semiconductor laser system, the light source packages a plurality of strip array semiconductor light emitting chips together and forms strip light spots by shaping with a complex micro-lens optical system, and the laser system has a huge volume; the other type of the laser consists of a high-power optical fiber output laser and a laser shaping optical system, wherein the shaping optical system mainly comprises two types, one type is the laser shaping optical system adopting a micro lens array, and the other type is the laser shaping optical system adopting a beam integrating mirror. In contrast, the optical fiber output type laser head is much smaller, is convenient to use and is expensive. At present, when the laser systems generating the strip-shaped light spots are used for cladding, the following problems mainly exist in the technology:

1. these lasers typically produce only a simple stripe configuration of the spot. And relevant researches show that in the broadband laser cladding, if the substrate can be preheated before sintering and slowly cooled after sintering, the quality of the laser cladding can be greatly improved, and the sintering stress is eliminated or reduced. However, to generate such a light spot, special optical elements are required, which is difficult to manufacture and complicated to debug, such as the chinese patent "laser broadband cladding apparatus" (patent application No. cn201610879013. x).

2. These laser devices cannot change their spot configuration once they are produced. In practical application, different materials of different substrates need different light spot structures to be generated, such as central power and edge power, and if the powers can be adjusted in real time, the application range of the device is undoubtedly greatly increased, and more industrial requirements are met.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned problem that exists among the prior art, the utility model aims at providing a laser broadband melts and covers system based on a plurality of optic fibre output laser module, this system directly utilizes the miniwatt module, founds the strip facula of required structure, and each part of facula can independent control so that the facula structure satisfies different laser beam machining process requirements. The equipment cost is reduced due to the adoption of conventional optical elements and the avoidance of the use of high-power lasers. In addition, the system is simple to debug.

In order to realize the purpose, the utility model discloses a technical scheme is: a laser broadband cladding system based on a plurality of optical fiber output laser modules comprises a feeding device and at least one laser head; each laser head comprises a plurality of optical fiber output laser modules and an imaging lens, the optical fiber output end faces of the optical fiber output laser modules are arranged in a row in one plane, and when the optical fiber output end faces are arranged in a plurality of rows, the rows are parallel to each other to form a strip; the imaging lens comprises at least one lens element and is positioned on an output optical path of the optical fiber output end face of the laser module;

when the feeding device vertically feeds the material to the surface of the object to be clad, the laser head transmits the image formed by the imaging lens on the end face of the optical fiber arranged into the strip shape to the material at least one side of the two sides of the feeding device, and the long edge of the strip image is parallel to the long edge of the material;

when the laser head vertically irradiates the images formed by the imaging lenses on the end faces of the optical fibers arranged into strips on the surface of the object to be clad, the feeding device sends the materials to a laser irradiation area on the surface of the object to be clad from at least one of two sides; the laser broadband cladding system sinters materials and the surface of an object together.

Furthermore, set up the beam splitting part that contains a beam splitting component at least in the laser head, the beam splitting part is used for dividing the light beam into many, the terminal surface of the optic fibre output laser module output fiber of strip arrangement becomes a plurality of images behind beam splitting part and the imaging lens, forms even bar facula after these images are combined.

Further, the light splitting component is a polarization light splitting device, or a space wave surface light splitting device, or a combination of the polarization light splitting device and the space wave surface light splitting device; the polarization beam splitter is a parallel flat plate crystal displacement plate which splits O light (normal light) and E light (abnormal light) and generates relative displacement, or a crystal wedge plate which splits O light (normal light) and E light (abnormal light) and generates relative displacement; the spatial wavefront beam splitting device is a spatially arranged wedge that produces a relative deflection of the beam or a plurality of spatially arranged mirrors that produce a relative deflection of the beam.

Further, the output fiber core section of the fiber output laser module is circular or rectangular.

Further, the fiber output laser modules are independently controlled, and the relative duration of light emission is the same or different; the power over the relative duration of time that the fiber output laser modules emit light is the same, or different; the relative durations of light emission by the fiber output laser modules are synchronous or asynchronous; the light spot structure with the light spot structure changing along with time is formed, and the requirements of different laser processing on the light spots are met.

Furthermore, the strip-shaped light spots emitted by the two laser heads lean against each other along the direction perpendicular to the strip-shaped materials, the strip-shaped materials are positioned in the center of the synthesized light spot, the power of the adjacent partial areas of the two strip-shaped light spots is higher than that of other areas, and the light spots with high central power and low power at two sides and with the functions of preheating and slow cooling are formed.

Furthermore, the strip-shaped light spots sent by the two laser heads are partially overlapped in the direction perpendicular to the strip-shaped materials, the overlapped area is overlapped with the strip-shaped materials, the center power of the light spots is high, the power of the two sides of the light spots is low, and the laser has the functions of preheating and slow cooling.

Compared with the prior art, the utility model discloses following beneficial effect has at least: firstly, by reasonably designing an optical system, a low-power optical fiber is directly used for outputting a laser module, so that a high-power laser is avoided; the cost of a system directly formed by utilizing the low-power optical fiber output laser module is greatly reduced, and the price of the unit power of the low-power laser module is usually not higher than 0.5 time of the price of the unit power of the high-power laser; in the prior art, a high-power optical fiber output laser and an optical shaping system are adopted to generate strip-shaped light spots, and the high-power light spots are formed by the light combination beams of a plurality of low-power modules, and the optical shaping system adopts a special optical element, so that the system is complex in technology and high in price; in addition, in the system of the utility model, all the conventional optical elements are adopted, thus reducing the processing cost and the debugging difficulty; and simultaneously, the utility model discloses accessible independent control many miniwatt modules changes the structure of processing facula as required in real time.

Further, the utility model discloses a scheme can realize on the facula on perpendicular to length direction's cross-section, and the facula has the structure that central power height edge power is low, perhaps, on perpendicular to length direction's cross-section on the facula, has the structure of a central high power facula and two low-power limit faculas, and these structures can provide the base member and preheat gentle cooling function, improve the sintering quality. The relative power distribution of the light spots can be controlled in real time, can be flexibly adjusted according to the process requirements, and is suitable for different requirements.

Drawings

Fig. 1A is a schematic structural diagram of a center feeding bilateral irradiation system of a laser broadband cladding system based on a plurality of fiber output laser modules according to the present invention.

Fig. 1B is a schematic diagram of a system structure of a central laser irradiation and unilateral feeding of the laser broadband cladding system based on a plurality of fiber output laser modules of the present invention.

Fig. 2A is a schematic structural diagram of a first optical splitting component according to the present invention, which is a parallel flat plate crystal displacement plate for generating relative displacement.

Fig. 2B is a schematic structural diagram of a second spectroscopic component according to the present invention, which is a crystal wedge that generates a relative angular displacement.

Fig. 3A is a schematic structural diagram of a third light splitting component according to the present invention, which is an optical wedge for generating relative deflection of light beams.

Fig. 3B is a schematic structural diagram of a fourth spectroscopic assembly of the present invention, which is a plurality of spatially arranged mirrors for generating relative deflection of light beams.

Fig. 4A is the utility model provides an arrangement structure of fiber output laser module output fiber end face in laser head.

Fig. 4B is the utility model provides a second kind of arrangement structure of fiber output laser module output fiber end face in laser head.

Fig. 5A is a light path structure of the laser head proposed by the present invention; FIG. 5B is an arrangement of the output fiber end faces of the fiber output laser modules; FIG. 5C is an arrangement structure of images generated after the optical fiber end face arrangement structure shown in FIG. 5B passes through the optical path structure of the laser head shown in FIG. 5A;

fig. 6A is an arrangement structure of the output fiber end faces of the fiber output laser modules in the laser head proposed by the present invention; fig. 6B shows the structure of the light spot formed by the optical system in the laser head in the structure shown in fig. 6A.

Fig. 7A is a light path structure of the laser head proposed by the present invention; FIG. 7B is an arrangement of the output fiber end faces of the fiber output laser modules; FIG. 7C is an arrangement structure of images generated after the optical fiber end face arrangement structure shown in FIG. 7B passes through the optical path structure of the laser head shown in FIG. 7A;

wherein: m-1, M-2, …, M-N, M1-1, M1-2, …, M1-N1, M2-1, M2-2, … and M2-N2 respectively represent optical fiber output laser modules; l, L1, L2 denotes an imaging lens; l1-1 denotes a collimator lens; l1-2 denotes a focusing lens; SL represents a feeding device; OB and I respectively represent an object plane where an output optical fiber end face of the optical fiber output laser module is located and a corresponding conjugate image plane; PBS1 and PBS2 each represent a crystal beam splitter; BS1 denotes a wedge beamsplitter; RBS1 and RBS2 represent reflective beam splitters, respectively; JGT1, JGT2, and JGT denote laser heads.

Detailed Description

The laser broadband cladding system based on a plurality of optical fiber output laser modules provided by the invention is described in detail below with reference to the accompanying drawings and embodiments.

Fig. 1A is a schematic structural diagram of a laser broadband cladding system based on a plurality of fiber output laser modules according to the present invention, which is a broadband laser cladding system with center feeding and two-side laser irradiation, and it is composed of a feeding device SL located at the center and laser heads JGT1 and JGT2 located at two sides of the feeding device SL, respectively. The feeding device SL vertically conveys materials to the surface to be clad, the surface to be clad is vertical to the paper surface, the materials are flaky materials or strip-shaped powder materials, and the distribution direction of the materials is vertical to the paper surface; the laser head JGT1 positioned on the left side consists of N1 fiber output laser modules M1-1, M1-2, …, M1-N1 and an imaging lens L1, the end faces of the output fibers of the N1 fiber output laser modules M1-1, M1-2, … and M1-N1 are arranged in at least one row in the direction vertical to the paper surface, and when the output fibers are arranged in multiple rows, the fibers in each row are parallel to each other and are distributed in a strip shape; the imaging lens L1 is usually composed of multiple lenses to meet the requirements of imaging quality, and only one lens is shown here for illustration, with its optical axis on the paper; the optical fiber end surfaces distributed in a strip shape are overlapped on the strip material through the image formed by the imaging lens L1; the laser head JGT2 positioned on the right side consists of N2 fiber output laser modules M2-1, M2-2, …, M2-N2 and an imaging lens L2, the end faces of the output fibers of the N2 fiber output laser modules M2-1, M2-2, … and M2-N2 are arranged in at least one row in the direction vertical to the paper surface, and when the output fibers are arranged in multiple rows, the fibers in each row are parallel to each other and are distributed in a strip shape; the imaging lens L2 is usually composed of multiple lenses to meet the requirement of imaging quality, only one lens is shown here for illustration, the optical axis is located on the paper, and the images formed by the end faces of the optical fibers distributed in a strip shape after passing through the imaging lens L2 are overlapped on the strip material; the two groups of light spots are combined to sinter the materials on the surface of the object to be clad.

Remove one with the laser head in fig. 1A, just derive the utility model provides a broadband laser cladding system structure sketch map that a center pay-off, unilateral laser shines based on the laser broadband cladding system of a plurality of fiber output laser modules. Since both deal with technical problems in a similar manner, they are not specifically listed here.

Fig. 1B is another schematic structural diagram of a laser broadband cladding system based on a plurality of fiber output laser modules according to the present invention, which is a broadband laser cladding system with central laser irradiation and single-side feeding, and is composed of a feeding device SL and a laser head JGT. The feeding device SL conveys materials to the surface to be clad from the left side of the laser head JGT, the surface to be clad is vertical to the paper surface, the materials are sheet materials or strip-shaped powder materials, and the material distribution direction is vertical to the paper surface; the laser head JGT comprises N optical fiber output laser modules M-1, M-2, …, M-N and an imaging lens L, the light emitted by the laser head JGT vertically irradiates the surface to be clad, the end surfaces of the output optical fibers of the N optical fiber output laser modules M-1, M-2, … and M-N are arranged into at least one row in the direction vertical to the paper surface, when the output optical fibers are arranged into a plurality of rows, the optical fibers of each row are mutually parallel and are distributed in a strip shape; the imaging lens L is usually composed of a plurality of lenses to meet the requirements of imaging quality, only one lens is drawn for illustration, the optical axis of the lens is positioned on a paper surface, and images formed by the end surfaces of the optical fibers distributed in a strip shape after passing through the imaging lens L are overlapped on strip-shaped materials; the light spot sinters the material to the surface of the object to be clad.

A feeding device is added in fig. 1B, so that the utility model provides a broadband laser cladding system structure diagram of bilateral feeding, which is based on center irradiation and bilateral feeding of the laser broadband cladding system of a plurality of optical fiber output laser modules. Since both deal with technical problems in a similar manner, they are not specifically listed here.

The utility model discloses an in certain embodiment, in order to improve the degree of consistency of strip facula, can set up the beam splitting part in the light path of laser head, the beam splitting part contains a slice beam splitting component at least. The light splitting component enables the imaging light path to be separated in space, the output end of the laser head outputs images of a plurality of spatially separated strip-shaped distributed optical fiber end faces, the separation direction is generally parallel to or perpendicular to the arrangement direction of the strip-shaped optical fibers, and the images are combined to form uniform strip-shaped light spots. There are many kinds of elements for realizing light splitting, and the elements can be polarization light splitting devices, space wave surface light splitting devices, or the combination of the polarization light splitting devices and the space wave surface light splitting devices. There are two types of polarization beam splitters, one is a parallel flat plate crystal displacement plate that splits O light (normal light) and E light (extraordinary light) and generates a relative displacement, as shown in fig. 2A, and the other is a crystal wedge that splits O light (normal light) and E light (extraordinary light) and generates a relative displacement, as shown in fig. 2B. The spatial wavefront beam splitter can be a spatially arranged wedge that produces a relative deflection of the beam, as shown in FIG. 3A, or can be a spatially arranged plurality of mirrors that produce a relative deflection of the beam, as shown in FIG. 3B.

In an embodiment of the present invention, the output fiber core section of the fiber output module may be circular or rectangular. The core sizes of the output fibers may be the same or different.

In one embodiment of the present invention, the optical fiber output laser modules can be independently controlled, and the relative duration of light emission of each module can be the same or different; the power of the fiber output laser modules during the relative duration of light emission may be the same or different; the relative durations of light emission by the fiber output laser modules may or may not be synchronized. Therefore, the light spot structure with the light spot structure changing along with time is formed, and the requirements of different laser processing on the light spots are met. In an embodiment of the present invention, the modules corresponding to the optical fiber end surfaces arranged in a row are controlled in a unified manner.

The utility model discloses an in certain embodiment, a good facula constitutes the method and leans on the strip facula that two laser heads that will be located both sides respectively sent along perpendicular to bar material direction together, and the strip material is located synthetic facula center, and the power of the subregion that two strip faculas are adjacent is higher than other regional powers, forms the facula that central power height both sides power is low to have preheating and slow cooling function.

The utility model discloses an in certain embodiment, a good facula constitutes the method and is the strip facula that will be located two laser heads of both sides respectively and send partially overlaps at the perpendicular to bar material direction, and this overlap region overlaps with the strip material, and this kind of facula central power is high, and both sides power is low, has and preheats gentle cooling function.

Example 1: according to the utility model provides a technical scheme of laser broadband cladding system based on a plurality of optic fibre output laser module, the utility model discloses an in certain embodiment, we have designed a central laser and have shone, the laser broadband cladding system of unilateral pay-off, the structure is shown in FIG. 1B. In this embodiment, a light spot structure is designed as shown in fig. 4A, which is composed of 3 rows of fiber end faces, wherein two rows of edges are aligned in the vertical arrangement direction, and the middle row is staggered by half a fiber pitch in the vertical arrangement direction, the fiber end faces of the structure are imaged on the surface to be clad through an imaging lens L, and a relatively uniform strip-shaped light spot can be formed by slightly keeping a defocus. Another spot design is shown in FIG. 4B, which is a structure with a main spot at the center and an auxiliary spot at the side, and the spots can preheat the substrate and the material during the processing and realize slow cooling of the sintering area. In a preferred embodiment, the core parameters are as follows: the core diameter of the output optical fiber of the laser module is 105 micrometers, and the diameter of the cladding is 125 micrometers; three rows of optical fibers of the main light spots are closely arranged together, wherein two rows of edges of the optical fibers are aligned in the vertical arrangement direction, the middle row of the optical fibers is staggered by half of the optical fiber distance in the vertical arrangement direction, and the maximum output power of each module is 150 watts; the two auxiliary light spots are formed by two rows of optical fibers, the two rows of optical fibers are staggered by half of the optical fiber distance in the vertical arrangement direction, and the maximum output power of each module is 50 watts; the distance between the auxiliary light spot and the main light spot is 250 micrometers; all laser modules in the main light spot are controlled in a unified mode and work synchronously; all laser modules in each auxiliary light spot are respectively and uniformly controlled and respectively work synchronously. By controlling the parameters of the imaging lens, processing light spots with different sizes can be realized, and the system can control the relative power of the main light spot and the auxiliary light spot in real time and realize the optimization of the processing parameters.

Example 2: according to the utility model provides a technical scheme of laser broadband cladding system based on a plurality of optic fibre output laser module, the utility model discloses an in certain embodiment, we have designed a central pay-off, and two side laser irradiation's laser broadband cladding system, the structure is as shown in fig. 1A. In this system, the spot configuration of each laser head is the same, and the arrangement of the output fiber end faces of the fiber output laser modules in each laser head is as shown in fig. 5B. The laser head adopts the optical path shown in fig. 5A. In the optical path, the PBS2 is a crystal wedge, which forms two images of O light and E light with certain angular displacement on the end face of the optical fiber, the image pitch is determined by the displacement angle and the distance from the PBS2 to the object plane, and the working principle is shown in fig. 2B. The beam splitter is an optical wedge, occupies a half area of the beam cross section, forms two groups of images with certain displacement on the image plane, the distance between the two groups of images is determined by the deflection angle of the optical wedge and the distance from the optical wedge to the image plane, and the working principle of the optical wedge is shown in fig. 3A. In this optical path, light emitted from a point a on an end face of one of the output optical fibers is separated into ordinary light O and extraordinary light E by passing through a polarizing beam splitter PBS2, the two lights are angularly displaced relative to each other, which corresponds to two images a' and a ″, and after passing through an imaging lens, BS1, which is provided on a light transmission cross section and occupies 50% of the cross section, further forms 4 image points AO1, AO2, AE1, and AE2 on a conjugate image plane I. Obviously, the system forms 4 groups of images transversely staggered with each other on the image surface by the end surfaces of the output fibers of the fiber output modules, and the images jointly form the light distribution on the image surface.

In a preferred embodiment, the core parameters are as follows: the core diameter of the fiber is 105 microns, the cladding is 125 microns, and the two rows of fibers shown in fig. 5B are spaced 250 microns apart, with the fibers in each row being close together. The polarization beam splitter PBS2 makes the light passing through it form a displacement of 31.25 microns on the object plane, and the displacement direction is the same as the arrangement direction of the optical fibers; after passing through the imaging lens L1, the light beam is divided into two groups by the spectroscope BS1, the spectroscope BS1 occupies a half area of the light beam section, two groups of images with certain displacement are formed on the image plane, the displacement is 62.5 microns multiplied by the magnification of the imaging system, the displacement direction is the same as the arrangement direction of the fiber end faces, 4 groups of images of the fiber end faces are formed on the conjugate image plane, and the images are superposed to form strip-shaped uniform light distribution shown in figure 5C.

In the embodiment, light spots from two laser heads are arranged close to each other on the surface to be clad, the maximum output power of one row of optical fibers adjacent to the two laser heads is 150 watts, the laser modules corresponding to the two rows of optical fibers are controlled uniformly and work synchronously, the maximum output power of the two rows of optical fibers on the outer layer is 50 watts, and each row is controlled independently. The combined light spot forms a structure with high central power and low edge power, and the power of the main light spot and the power of the auxiliary light spot can be controlled in real time, so that the combined light spot can meet various cladding processing requirements.

Example 3: according to the utility model provides a technical scheme of laser broadband cladding system based on a plurality of optic fibre output laser module, the utility model discloses an in certain embodiment, we have designed a central pay-off, and two side laser irradiation's laser broadband cladding system, the structure is as shown in fig. 1A. In this system, the spot configuration of each laser head is the same, and the arrangement of the output fiber end faces of the fiber output laser modules in each laser head is as shown in fig. 6A. The laser head adopts a similar light path as that of FIG. 5A, and the reconstruction method comprises the following steps: in FIG. 5A, beamsplitter BS1 after the imaging lens is removed and wedge-type polarizing beamsplitter PBS2 before the imaging lens is replaced with parallel plate crystal displacement plate PBS1 shown in FIG. 2A. In this embodiment, the optical fiber core is a square core of 100X100 microns, the optical fiber spacing is 200 microns, and the two rows of optical fibers are 200 microns. The polarizing beam splitter PBS1 makes the light passing through it form 100 micron displacement on the object plane, and the displacement direction is the same as the optical fiber arrangement direction; after passing through the imaging lens L1, two sets of images with a certain displacement are formed, the displacement is 100 micrometers multiplied by the magnification of the imaging system, the displacement direction is the same as the arrangement direction of the end faces of the optical fibers, and the images are superposed to form the strip-shaped uniform light distribution spots shown in fig. 6B.

Example 4: according to the utility model provides a technical scheme of laser broadband cladding system based on a plurality of optic fibre output laser module, the utility model discloses an in certain embodiment, we have designed a central pay-off, and two side laser irradiation's laser broadband cladding system, the structure is as shown in fig. 1A. In this system, the spot configuration of each laser head is the same, and the arrangement of the output fiber end faces of the fiber output laser modules in each laser head is as shown in fig. 7B. The laser head employs the optical path shown in fig. 7A. In the light path, the imaging lens consists of a collimating lens L-1 and a focusing lens L-2; the polarization beam splitter PBS1 is a parallel flat plate crystal displacement plate shown in fig. 2A, and is located in front of the collimating lens; the principle of operation of the reflecting beam splitters RBS1 and RBS2 is shown in fig. 3B, with the reflected light passing through them at an angle, disposed between the collimating and focusing lenses. In this system, light emitted from a point a on an end face of one output optical fiber is split into normal light O and abnormal light E by passing through a polarization beam splitter PBS1, which is equivalent to forming two images a' and a ″, which are separated in a direction perpendicular to the paper surface; after passing through the collimating lens, the mirrors RBS1 and RBS2 with a certain angle, which are arranged on the light transmission cross-section and each occupy 50% of the cross-section, are spatially separated into two beams of light with a certain angle, which, after passing through the focusing lens, form 4 image points AO1, AO2, AE1 and AE2 on the focal plane I behind the focusing lens. Mirror RBS1 and RBS2 form a separation of the image in a direction parallel to the page. Obviously, the light splitting system of the system splits light in two perpendicular directions, and 4 groups of images which are transversely staggered with each other are formed on the image plane by the end faces of the output optical fibers of the plurality of optical fiber output modules, and the images jointly form light distribution on the image plane.

In this embodiment, the optical fiber core is a square core of 100X100 microns, the optical fiber spacing is 200 microns, and the two rows of optical fibers are 200 microns. The polarizing beam splitter PBS1 forms 100 micron displacement on the object plane by the light passing through the polarizing beam splitter PBS1, and the displacement direction is vertical to the arrangement direction of the optical fibers; the beam splitters RBS1 and RBS2 formed 100 micron displacements on the object plane, which were superimposed parallel to the fiber alignment direction to form the stripe-shaped uniform light distribution spot shown in fig. 7C.

In the embodiment, the light spots from two laser heads are overlapped together on the surface to be clad by half of the width of each light spot, the maximum output power of the end faces of the two overlapped optical fibers is 150 watts, and laser modules corresponding to the two rows of optical fibers are uniformly controlled and work synchronously; the maximum output power of the two rows of fibers in the non-overlapping region is 100 watts, and each row is controlled independently. The combined light spot forms a structure with high central power and low edge power, and the power of the main light spot and the power of the auxiliary light spot can be controlled in real time, so that the combined light spot can meet various cladding processing requirements.

The utility model provides a laser width melts and covers system based on a plurality of optic fibre output laser module can provide various required facula structures technically to these facula structures can real time control in order to satisfy the requirement of various laser cladding processing technology, have extended the ability of cladding processing, have improved processingquality. Because the system is directly constructed by adopting the low-power module, the system has the advantages of simple structure and low cost.

Claims

1. A laser broadband cladding system based on a plurality of optical fiber output laser modules is characterized by comprising a feeding device and at least one laser head; each laser head comprises a plurality of optical fiber output laser modules and an imaging lens, the optical fiber output end faces of the optical fiber output laser modules are arranged in a row in one plane, and when the optical fiber output end faces are arranged in a plurality of rows, the rows are parallel to each other to form a strip; the imaging lens comprises at least one lens, and is positioned on an output optical path of the optical fiber output end face of the laser module;

2. The laser broadband cladding system based on a plurality of optical fiber output laser modules of claim 1, wherein a light splitting component at least comprising a light splitting element is arranged in the laser head, the light splitting component is used for splitting a light beam into a plurality of parts, the end surfaces of the output optical fibers of the optical fiber output laser modules arranged in a strip shape form a plurality of images after passing through the light splitting component and the imaging lens, and the images are combined to form a uniform strip-shaped light spot.

3. The laser broadband cladding system based on the plurality of fiber output laser modules of claim 2, wherein the beam splitting component is a polarization beam splitter, or a spatial wave plane beam splitter, or a combination of a polarization beam splitter and a spatial wave plane beam splitter; the polarization light splitting device is a parallel flat plate crystal displacement sheet which splits O light and E light and generates relative displacement, or a crystal wedge-shaped sheet which splits O light and E light and generates relative angular displacement; the spatial wavefront beam splitting device is a spatially arranged wedge that produces a relative deflection of the beam or a plurality of spatially arranged mirrors that produce a relative deflection of the beam.

4. The laser broadband cladding system based on multiple fiber output laser modules of claim 1, wherein the output fiber core cross section of the fiber output laser module is circular or rectangular.

5. The laser broadband cladding system based on a plurality of fiber output laser modules of claim 1, wherein said fiber output laser modules are independently controlled, the relative durations of light emission are the same, or different; the power over the relative duration of time that the fiber output laser modules emit light is the same, or different; the relative durations of light emission by the fiber output laser modules are synchronous or asynchronous; and forming the light spot structure with the light spot structure changing along with time.

6. The laser broadband cladding system based on a plurality of optical fiber output laser modules of claim 1, wherein the strip-shaped light spots emitted by the two laser heads lean together along a direction perpendicular to the strip-shaped material, the strip-shaped material is located in the center of the synthesized light spot, and the power of the adjacent partial area of the two strip-shaped light spots is higher than that of other areas, so that the light spots with high central power, low power and preheating and slow cooling functions are formed.

7. The laser broadband cladding system based on a plurality of optical fiber output laser modules of claim 1, wherein the strip-shaped light spots emitted by the two laser heads are partially overlapped in the direction perpendicular to the strip-shaped material, and the overlapped area is overlapped with the strip-shaped material to form a light spot structure with high central power and low side power.