CN116713609A

CN116713609A - Carbonization-free laser processing system and method for metal endless belt

Info

Publication number: CN116713609A
Application number: CN202310878203.XA
Authority: CN
Inventors: 陈驰磊; 乔磊; 曾清宏; 王玉龙; 张波; 丁培; 张晨
Original assignee: Shenzhen Monochrome Technology Co ltd
Current assignee: Shenzhen Monochrome Technology Co ltd
Priority date: 2023-07-18
Filing date: 2023-07-18
Publication date: 2023-09-08

Abstract

The application discloses a carbonization-free laser processing system and a carbonization-free laser processing method for a metal endless belt, wherein the carbonization-free laser processing method for the metal endless belt comprises the following steps of sequentially arranging along an optical path: the laser is used for emitting a first femtosecond laser beam, and the first femtosecond laser beam is linearly polarized light; the beam expander is used for expanding the first femtosecond laser beam; the polarization regulating element is used for regulating the polarization state distribution of the first femtosecond laser beam after beam expansion to form a second femtosecond laser beam; the beam adjustment module is used for changing the transmission direction of the second femtosecond laser beam and adjusting the angle of the second femtosecond laser beam to form a third femtosecond laser beam; and the focusing module is used for focusing the third femtosecond laser beam and obtaining a focus spot, so that the focus spot directly acts on the metal endless belt to process, the processing quality, the processing efficiency and the product processing quality of the metal endless belt are improved, and the product loss rate in the processing process is reduced.

Description

Carbonization-free laser processing system and method for metal endless belt

Technical Field

The application relates to the technical field of laser precision machining, in particular to the machining fields of cutting, punching, etching and the like of an interventional type or implanted type medical instrument by laser, and particularly relates to a carbonization-free laser machining system and method for a metal endless belt.

Background

The laser processing has the advantages of high energy density, small heat affected zone, no contact damage in the processing process, no mechanical processing stress, capability of processing high-hardness brittle materials, small noise, no cutting, no cutter abrasion, easiness in integrated automatic control and the like, is a high-efficiency, safe and environment-friendly processing mode, and is widely applied to the high-end manufacturing fields of aerospace, automobiles, ships, digital electronics, interventional or implantable medical devices and the like.

The interventional medical instrument is inserted into a human body or a natural cavity opening through surgical means, and is used for performing treatment or examination for a short time, and is taken out after the treatment or examination is finished. Such as: an intravascular radiography catheter, a balloon dilatation catheter, a central venous catheter, an arteriovenous pressure measurement catheter, a probe of a disposable interventional therapeutic instrument and the like. The implantable medical device refers to devices such as bone nails, artificial organs, heart stents and the like which are fully or partially inserted into a human body or a natural orifice through surgical means or replace the surface of an upper epidermis or an eye, remain in the body for at least 30 days, and can only be taken out through surgical or medical means.

In conventional processing applications using long pulse lasers (microseconds, nanoseconds, etc.), the primary interaction of the laser with the material is to convert the laser energy into a thermal effect to melt and vaporize the material, thereby effecting removal of the material. However, in this process, a large and strong heat affected zone (HAZ, heatAffectedZone) is formed due to heat accumulation. In the material processing application of the interventional or implantable medical device, the heat affected zone can cause adverse effects such as overheat deformation, edge melting, oxidation blackening, residues, burrs and the like of the material processing zone, thereby causing functional or appearance damage, reducing product quality and yield, and generally, complicated subsequent cleaning steps are required to be introduced to eliminate the adverse effects, so that the production cost is greatly increased.

Therefore, the above technical problems are to be solved.

Disclosure of Invention

The embodiment of the application provides a carbonization-free laser processing system and a carbonization-free laser processing method for a metal ring belt, which are used for solving or partially solving the problems that in the material processing application of an interventional or implantable medical device, adverse effects such as overheat deformation, edge melting, oxidation blackening, residues, burrs and the like occur in a material processing area, so that functions or appearance are damaged, the product quality and the yield are reduced, complicated subsequent cleaning steps are generally required to be introduced to eliminate the adverse effects, and the production cost is greatly increased.

A no carbonization laser processing system for metal endless belt sets gradually along the light path:

the laser is used for emitting a first femtosecond laser beam, and the first femtosecond laser beam is linearly polarized light;

the beam expander is used for expanding the first femtosecond laser beam so as to enable the first femtosecond laser beam to have uniform energy density;

the polarization regulating element is used for regulating the polarization state distribution of the first femtosecond laser beam after beam expansion to form a second femtosecond laser beam;

the beam adjustment module is used for changing the transmission direction of the second femtosecond laser beam and adjusting the angle of the second femtosecond laser beam to form a third femtosecond laser beam;

and the focusing module is used for focusing the third femtosecond laser beam and obtaining a focus spot so that the focus spot directly acts on the metal endless belt to process.

Through adopting above-mentioned technical scheme, utilize beam expander to make the first femtosecond laser beam that the laser instrument launched have even energy density to, and adjust the polarization state distribution of first femtosecond laser beam through polarization regulation and control element, obtain the second femtosecond laser beam, the second femtosecond laser beam is handled to the rethread beam adjustment module, obtain the third femtosecond laser beam, then, carry out focusing treatment to the third femtosecond laser beam through focusing module, directly act on the metal clitellum with the focus facula that obtains, the processingquality of metal clitellum and product processingquality have been improved, the product loss rate in the course of working has been reduced, and, avoided follow-up clean step, and improved machining efficiency.

The present application may be further configured in a preferred example to: the polarization controlling element has a fast axis;

the polarization regulating element is configured to be capable of regulating the polarization state distribution of the first femtosecond laser beam after beam expansion by regulating the direction of the fast axis to form a second femtosecond laser beam.

By adopting the technical scheme, the polarization direction of the first femtosecond laser beam is parallel to the fast axis direction of the polarization regulation element, so that the first femtosecond laser beam has large phase velocity in the polarization regulation element, and the polarization direction of the first femtosecond laser beam when being incident forms an included angle of 45 degrees with the axial direction of the polarization regulation element, so that the polarization state distribution of the first femtosecond laser beam is changed, circularly polarized light is obtained, and the second femtosecond laser beam is formed.

The present application may be further configured in a preferred example to: the light beam adjusting module comprises a plurality of groups of reflecting mirrors and scanning galvanometers;

the second femtosecond laser beam passes through a plurality of groups of reflectors and then changes the transmission direction;

and adjusting the angle of the second femtosecond laser beam with the transmission direction changed through the scanning galvanometer, and performing high-speed two-dimensional scanning to form a third femtosecond laser beam.

By adopting the technical scheme, the transmission direction of the second femtosecond laser beam is changed by the arrangement of the multiple groups of reflectors, the high reflectivity of the second femtosecond laser beam is improved, the second femtosecond laser beam is scanned at a two-dimensional high speed in a horizontal plane through the scanning galvanometer, a third femtosecond beam is formed for quickly and accurately positioning a focus spot on a metal annular belt, and the second femtosecond laser beam is moved back and forth at a certain speed through the scanning galvanometer, so that a specified pattern is obtained.

The present application may be further configured in a preferred example to: the scanning galvanometer comprises a rotating motor and a lens, and the lens is arranged on the rotating motor;

and driving the lens to deflect through the rotating motor so as to perform high-speed two-dimensional scanning on the second femtosecond laser beam to form a third femtosecond laser beam.

By adopting the technical scheme, the rotating motor drives the lens to deflect, so that two-dimensional controllable laser beam deflection is realized, a third femtosecond laser beam is obtained, and the third femtosecond laser beam can be rapidly and accurately positioned.

The present application may be further configured in a preferred example to: the rotating motor comprises an X-axis rotating motor and a Y-axis rotating motor, the lenses comprise a first lens and a second lens, the first lens is arranged on the X-axis rotating motor, and the second lens is arranged on the Y-axis rotating motor;

the first lens is driven by the X-axis rotating motor to perform high-speed one-dimensional scanning on the second femtosecond laser beam in the X-axis direction, and meanwhile, the second lens is driven by the Y-axis rotating motor to perform high-speed one-dimensional scanning on the second femtosecond laser beam in the Y-axis direction, so that high-speed two-dimensional scanning of the second femtosecond laser beam in a plane is realized, and a third femtosecond laser beam is formed.

Through adopting above-mentioned technical scheme, X axle rotating electrical machines and Y axle rotating electrical machines mutually support and rotate and drive first lens and second lens and take place to deflect, and then drive the outgoing beam motion after first lens and second lens reflection, third femto second laser beam promptly, and then realize planar scanning, ensured the precision of metal endless belt processing position.

The present application may be further configured in a preferred example to: the carbonization-free laser processing system for the metal endless belt further comprises a rotary table for clamping the metal endless belt so that a focus spot can process the metal endless belt.

Through adopting above-mentioned technical scheme, the revolving stage sets up to two, carries out the centre gripping to the metal endless belt through two revolving stages, reduces the emergence of phenomenon such as metal endless belt warp and fish tail, improves the machining precision and the machining effect of metal endless belt.

The present application may be further configured in a preferred example to: the lower extreme of revolving stage is provided with directly drives the motor, the revolving stage movable set up in directly drive on the motor.

Through adopting above-mentioned technical scheme, through the motor control revolving stage removal of directly driving, and then adjust the processing length of metal endless belt.

The present application may be further configured in a preferred example to: the carbonization-free laser processing system for the metal endless belt further comprises a water injection pipe and a rotary joint, wherein the water injection pipe is connected with the metal endless belt through the rotary joint and used for cooling the processed metal endless belt.

Through adopting above-mentioned technical scheme, the setting of water injection pipe both can reduce the thermal effect in the laser processing process, also can play the guard action to the clitellum inner wall simultaneously to, rotary joint's setting reduces the clitellum and makes the possibility of water injection pipe deformation in the course of working rotatory.

The application also aims to provide a carbonization-free laser processing method for the metal endless belt.

The second object of the present application is achieved by the following technical solutions:

a carbonization-free laser machining method for a metal endless belt, comprising:

emitting a first femtosecond laser beam by a laser according to laser processing parameters, wherein the first femtosecond laser beam is linearly polarized light;

expanding the first femtosecond laser beam through a beam expander;

the polarization state distribution of the first femtosecond laser beam after beam expansion is adjusted through the polarization regulation element to form a second femtosecond laser beam;

changing the transmission direction and angle of the second femtosecond laser beam according to a beam adjustment module to form a third femtosecond laser beam;

and carrying out focusing treatment on the third femtosecond laser beam by using a focusing module to obtain a focus light spot, so that the focus light spot directly acts on a metal endless belt to carry out processing.

The present application may be further configured in a preferred example to: the changing the transmission direction and angle of the second femtosecond laser beam according to the beam adjustment module to form a third femtosecond laser beam includes:

acquiring space position information of the metal endless belt;

and adjusting the focus of the second femtosecond laser beam based on the laser processing parameters and the space position information, wherein the focus is used for ensuring that the focus spot is in positive focus at the focus position of the metal endless belt.

In summary, the application has the following beneficial technical effects:

the carbonization-free laser processing system for the metal endless belt comprises the following components sequentially arranged along the light path: the device comprises a laser, a beam expander, a polarization regulating element, a light beam adjusting module and a focusing module. During laser machining, a high beam quality femtosecond laser pulse, i.e., a first femtosecond laser beam, is output by a laser. After beam expansion by the beam expander, the diameter of the first femtosecond laser beam is expanded to a preset size, and the energy distribution at each point of the light spot is more uniform. The polarization state distribution of the first femtosecond laser beam is changed through the polarization regulation element after beam expansion to form a second femtosecond laser beam. The second femtosecond laser beam passes through a plurality of groups of reflecting mirrors in the beam adjustment module to change the transmission direction of the laser, and the second femtosecond laser beam after changing the transmission direction passes through a scanning vibrating mirror in the beam adjustment module, and the lens deflection of two axes of the vibrating mirror is driven by the high-speed rotation of a motor of the scanning vibrating mirror, so that the second femtosecond laser beam can be scanned at a two-dimensional high speed in a horizontal plane to obtain a third femtosecond laser beam, and a focus spot can be scanned at a high speed in a two-dimensional plane along a preset track by the high-speed regulation of the scanning vibrating mirror, and the ultra-precise cutting of a two-dimensional complex graph structure is realized. After the third femtosecond laser beam is strongly focused by the high-quality focusing module, a focus light spot with high roundness can be generated, wherein the focus light spot has extremely high density, and when the focus light spot directly acts on the metal endless belt, the metal endless belt can be gasified instantly, so that the precise removal of the metal endless belt is realized. In addition, the metal endless belt is matched with the rotary table to rotate at a high speed, so that ultra-precise cutting of the three-dimensional complex structure can be realized. According to the technical scheme, the femtosecond laser is utilized to process the metal endless belt, the peak power is high, dissociation of the metal endless belt is easy to cause, the thermal effect is small, the processing precision is high, zero carbonization processing can be basically achieved, the processing quality, the processing efficiency and the product processing quality of the metal endless belt are improved, and the product loss rate in the processing process is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flow chart of a carboniless laser machining system for a metal endless belt in accordance with one embodiment of the present application;

FIG. 2 is a schematic diagram of a polarization control element of a carbonization-free laser machining system for a metal endless belt according to a first embodiment of the present application;

FIG. 3 is a schematic view showing the structure of a scanning galvanometer of a carbonization-free laser machining system for a metal endless belt according to a first embodiment of the application;

FIG. 4 is a flow chart of a method for carboniless laser machining of an endless metal belt in accordance with one embodiment of the present application.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein in the specification are used for the purpose of describing specific embodiments only, and are not intended to limit the present application, for example, the orientations or positions indicated by the terms "length", "aperture", "large", "small", "inner", "outer", etc. are orientations or positions based on the orientation or position shown in the drawings, and are merely for convenience of description and are not to be construed as limiting the present technical solution.

The terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion; the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.

In the description of the application and the claims and the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

Furthermore, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Example 1

In one embodiment of the application, a carbonization-free laser machining system for a metal endless belt is disclosed.

Referring to fig. 1, the carbonization-free laser processing system for a metal endless belt includes a laser 1, a beam expander 2, a polarization adjusting element 3, a beam adjustment module 4, and a focusing module 5 sequentially disposed along an optical path, wherein the laser 1 is electrically connected to a controller 6, and the controller 6 is electrically connected to the beam adjustment module 4. The controller 6 controls the laser 1 to emit a first femtosecond laser beam, the first femtosecond laser beam sequentially passes through the beam expander 2 and the polarization regulation element 3 to obtain a second femtosecond laser beam, the second femtosecond laser beam passes through the beam adjustment module 4 to obtain a third femtosecond laser beam, and the third femtosecond laser beam directly acts on the metal endless belt 7 to process after passing through the focusing module 5, so that the processing quality of the metal endless belt and the product processing quality are improved, the product loss rate in the processing process is reduced, the subsequent cleaning step is avoided, and the processing efficiency is improved.

Referring to fig. 2, the polarization adjustment element 3 described above is configured to be able to adjust the polarization state distribution of the first femtosecond laser beam after beam expansion by adjusting the direction of the fast axis to form a second femtosecond laser beam.

Specifically, the polarization direction of the first femtosecond laser beam is parallel to the fast axis direction of the polarization adjustment element 3, so that the first femtosecond laser beam has a large phase velocity in the polarization adjustment element 3, and the polarization direction of the first femtosecond laser beam after beam expansion forms an included angle of 45 degrees with the axial direction of the polarization adjustment element 3 by adjusting the fast axis direction, so as to change the polarization state distribution of the first femtosecond laser beam, and obtain circularly polarized light, namely form a second femtosecond laser beam, and in the embodiment, the polarization adjustment element 3 is a 1/4 wave plate.

The beam adjustment module 4 includes a plurality of groups of mirrors 41 and a scanning galvanometer 42, the transmission direction of the second femtosecond laser beam is changed after passing through the plurality of groups of mirrors 41, the high reflectivity of the second femtosecond laser beam is improved, and the second femtosecond laser beam is scanned at a high speed in two dimensions in a horizontal plane by the scanning galvanometer 42, so as to form a third femtosecond beam for rapidly and accurately positioning the focus spot on the endless metal belt 7, and the second femtosecond laser beam is reciprocally moved at a certain speed by the scanning galvanometer 42, thereby obtaining a prescribed pattern.

Further, referring to fig. 1 and 3, the scanning galvanometer 42 includes a rotary motor 421 and a lens 422, and the lens 422 is disposed on the rotary motor 421. The controller 6 is electrically connected with the rotating motor 421, and the rotating motor 421 is controlled by the controller 6 to rotate, so that the rotating motor 421 drives the lens 422 to swing, and the second femtosecond laser beam is subjected to high-speed two-dimensional scanning to form a third femtosecond laser beam. The rotating motor 421 drives the lens 422 to deflect, so as to realize two-dimensional controllable laser beam deflection, obtain a third femtosecond laser beam, and the third femtosecond laser beam can be rapidly and accurately positioned.

Specifically, the rotating motors include an X-axis rotating motor 421a and a Y-axis rotating motor 421b, the lens 422 includes a first lens 422a and a second lens 422b, the first lens 422a is disposed on the X-axis rotating motor 421a, and the second lens 422b is disposed on the Y-axis rotating motor 421 b. The first lens 422a is driven by the X-axis rotating motor 421a to perform high-speed one-dimensional scanning on the second femtosecond laser beam in the X-axis direction, and meanwhile, the second lens 422b is driven by the Y-axis rotating motor 421b to perform high-speed one-dimensional scanning on the second femtosecond laser beam in the Y-axis direction, so that high-speed two-dimensional scanning of the second femtosecond laser beam in a plane is realized, and a third femtosecond laser beam is formed. The X-axis rotating motor 421a and the Y-axis rotating motor 421b are mutually matched to rotate to drive the first lens 422a and the second lens 422b to deflect, so that the outgoing beam reflected by the first lens 422a and the second lens 422b is driven to move, namely, the third femtosecond laser beam, and further planar scanning is realized, and the accuracy of the machining position of the metal endless belt 7 is ensured.

In an embodiment, referring to fig. 1, a carbonization-free laser processing system for a metal endless belt further includes two rotating tables 8, and the two rotating tables 8 clamp and rotate the metal endless belt 7, so that a focus spot processes the metal endless belt 7, deformation, scratch and other phenomena of the metal endless belt 7 are reduced, and processing precision and processing effect of the metal endless belt 7 are improved.

Further, a direct-drive motor (not shown in the figure) is arranged at the lower end of the rotary table 8, the rotary table 8 is movably arranged on the direct-drive motor, the rotary table 8 is arranged on the direct-drive motor in a clamping manner or in a transmission manner, and only relative displacement between the rotary table 8 and the direct-drive motor can be realized. In this embodiment, the two rotary tables 8 are controlled to move by the direct drive motor, and the two rotary tables 8 move in opposite directions, so as to adjust the processing length of the metal endless belt 7.

In an embodiment, a carbonization-free laser processing system for a metal ring belt further comprises a water injection pipe 10 and a rotary joint 9, wherein the water injection pipe 10 is connected to the metal ring belt 7 through the rotary joint 9, when the metal ring belt 7 is clamped by the rotary table 8 and starts to rotate, an air chuck (not shown in the figure) arranged in the rotary table 8 synchronously drives the rotary joint 9 to rotate, uniform contact between the metal ring belt 7 and a laser beam is ensured, and the possibility that the water injection pipe 10 is deformed due to rotation of the metal ring belt 7 in the processing process can be reduced. The other end of the water injection pipe 10 is connected with a water injection pump 11, the water injection pump 11 starts to work, water in the reservoir 12 is injected into the metal endless belt 7 through the water injection pipe 10, so that the heat effect in the laser processing process can be reduced, the inner wall of the metal endless belt 7 is protected, and meanwhile, the cut metal endless belt 7 can fall into the receiving box 13 by utilizing the impulse of the water flow.

Example 2

Another embodiment of the present application provides a carbonization-free laser processing method for a metal endless belt, wherein the main flow of the method is described as follows:

referring to fig. 4, S10, a first femtosecond laser beam is emitted by a laser according to laser processing parameters, the first femtosecond laser beam being linearly polarized light.

Wherein the laser processing parameters include at least one of marking speed, idle jump speed, giant pulse generator tuning frequency, and fill pitch. A femtosecond laser beam is a pulsed laser, and femtosecond refers to the duration of a pulse. Femtosecond laser beam as shorter pulse ultrafast laserA bundle. Compared with a longer pulse laser beam, after the ultrafast pulse laser beam is focused, a focal spot with a micron-scale can be formed, and the peak power density of a central area of the spot can reach 1020-1022W/cm ² The magnitude can excite extremely strong local strong electromagnetic field, the strength of the local electromagnetic field is several times higher than the coulomb force of the action of the atoms checking the electrons around the local electromagnetic field, the chemical bonds between the atoms in the material can be directly realized, the electrons in the material are excited to be ionized instantaneously, and the strong coulomb repulsive force between the particles with positive charges in the material is caused to spray outwards in the form of plasma, so that the material is removed.

In the propagation direction of light, the light vector vibrates in only one fixed direction, and this light is called plane polarized light, and the trajectory of the light vector end point is a straight line, which is also called linearly polarized light.

When the embodiment is processed by using the femtosecond laser, the ultra-short pulse width and the ultra-high peak intensity of the femtosecond laser can induce the metal annular belt to generate nonlinear absorption effect, and the focal spot with the size far smaller than the diffraction limit is obtained, so that the spatial resolution of the processing is greatly improved.

S20, expanding the first femtosecond laser beam through a beam expander.

In this embodiment, after the beam expander is used to expand and shape the first femtosecond laser beam, a laser beam with uniform energy density is output. Specifically, the first femtosecond laser beam emitted by the laser has a certain divergence angle, and the diameter and the divergence angle of the first femtosecond laser beam are changed through the beam expander, so that the first femtosecond laser beam becomes a collimated (parallel) beam, and the collimation characteristic of the first femtosecond laser beam is improved.

S30, regulating the polarization state distribution of the first femtosecond laser beam after beam expansion through a polarization regulation element to form a second femtosecond laser beam.

Specifically, in this embodiment, the polarization adjustment element is a 1/4 wave plate, and when the first femtosecond laser beam passes through the 1/4 wave plate, the 1/4 wave plate is rotated, so that the optical axis and the vibration direction of the polarized light form a 45-degree angle, and the linearly polarized light can be converted into circularly polarized light, so as to form the second femtosecond laser beam.

Wherein the phase difference between ordinary and extraordinary rays is equal to pi/2 or an odd multiple thereof when the light passes through normally, such a wafer is called a quarter wave plate or a 1/4 wave plate.

S40, changing the transmission direction and angle of the second femtosecond laser beam according to the beam adjustment module to form a third femtosecond laser beam.

Specifically, the transmission direction of the second femtosecond laser beam is changed through a plurality of groups of reflecting mirrors in the beam adjustment module, the second femtosecond laser beam with changed transmission direction passes through a scanning vibrating mirror in the beam adjustment module, the lens deflection of two axes of the vibrating mirror is driven by the high-speed rotation of a motor of the scanning vibrating mirror, the second femtosecond laser beam is scanned at a two-dimensional high speed in a horizontal plane, a third femtosecond laser beam is obtained, and a focus spot is scanned at a high speed in the two-dimensional plane along a preset track by the high-speed regulation and control of the scanning vibrating mirror, so that ultra-precise cutting of a two-dimensional complex graph structure is realized.

The scanning galvanometer adopts a mode of drawing a long straight line in the processing process, and the mode can avoid the problems of overlarge first pulse energy of laser and switching light splicing in the laser processing process.

S50, focusing the third femtosecond laser beam by using a focusing module to obtain a focus spot, so that the focus spot directly acts on the metal endless belt to process.

The focusing module in this embodiment adopts a field lens, and after the third femtosecond laser beam is strongly focused by the field lens, a focus light spot with high roundness can be generated, wherein the focus light spot has extremely high density, when the focus light spot directly acts on the metal endless belt, the metal endless belt can be gasified instantly, and clean cutting without taper, burr and wall damage of a thin-wall pipe (the wall thickness is less than or equal to 0.2 mm) and clean cutting without burr and wall damage of a pipe with thicker wall thickness (the wall thickness is 0.2 mm-0.5 mm) can be realized, so that the processing quality of the focus light spot and the processing yield of the metal endless belt are improved.

In some possible embodiments, step S40, that is, changing the transmission direction and angle of the second femtosecond laser beam according to the beam adjustment module, forms a third femtosecond laser beam includes:

s41, acquiring space position information of the metal endless belt.

And S42, adjusting the focus of the second femtosecond laser beam based on the laser processing parameters and the spatial position information, wherein the focus is used for ensuring that the focus position of the focus spot in the metal endless belt is in positive focus.

The spatial position information may be input into the system database in advance, or may be acquired by a position sensor.

Specifically, the embodiment obtains the spatial position information of the metal ring belt, including the position of the metal ring belt on the rotary table, the position of laser etching, and the like, and controls the X-axis rotating motor and the Y-axis rotating motor in the scanning galvanometer to swing the rotating angle according to a certain voltage and angle conversion ratio according to the laser processing parameters and the spatial position information, so that plane scanning is realized, and the accuracy of the processing position of the metal ring belt is ensured. The whole control process adopts closed loop feedback control and is acted by a position sensor, a current integrator, a position discriminator and other control circuits.

As shown in fig. 4, in the carbonization-free laser processing method for a metal endless belt provided in this embodiment, a first femtosecond laser beam, which is a femtosecond laser pulse with high beam quality, is output by a laser during laser processing. After beam expansion by the beam expander, the diameter of the first femtosecond laser beam is expanded to a preset size, and the energy distribution at each point of the light spot is more uniform. The polarization state of the first femtosecond laser beam is changed through the polarization regulation element after beam expansion, so that a second femtosecond laser beam is formed. The second femtosecond laser beam passes through a plurality of groups of reflecting mirrors in the beam adjustment module to change the transmission direction of the laser, and the second femtosecond laser beam after changing the transmission direction passes through a scanning vibrating mirror in the beam adjustment module, and the lens deflection of two axes of the vibrating mirror is driven by the high-speed rotation of a motor of the scanning vibrating mirror, so that the second femtosecond laser beam can be scanned at a two-dimensional high speed in a horizontal plane to obtain a third femtosecond laser beam, and a focus spot can be scanned at a high speed in a two-dimensional plane along a preset track by the high-speed regulation of the scanning vibrating mirror, and the ultra-precise cutting of a two-dimensional complex graph structure is realized. After the third femtosecond laser beam is strongly focused by the high-quality focusing module, a focus light spot with high roundness can be generated, wherein the focus light spot has extremely high density, and when the focus light spot directly acts on the metal endless belt, the metal endless belt can be gasified instantly, so that the precise removal of the metal endless belt is realized. In addition, the metal endless belt is matched with the rotary table to rotate at a high speed, so that ultra-precise cutting of the three-dimensional complex structure can be realized. According to the technical scheme, the femtosecond laser is utilized to process the metal endless belt, the peak power is high, dissociation of the metal endless belt is easy to cause, the thermal effect is small, the processing precision is high, zero carbonization processing can be basically achieved, the processing quality, the processing efficiency and the product processing quality of the metal endless belt are improved, and the product loss rate in the processing process is reduced.

The integrated units in the above embodiments may be stored in the above-described computer-readable storage medium if implemented in the form of software functional units and sold or used as separate products.

Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing one or more computer devices (which may be personal computers, servers or network devices, etc.) to perform all or part of the steps of the method described in the embodiments of the present application.

In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

The above-described apparatus embodiments are merely illustrative, such as the division of the units, merely a logical functional division, and there may be additional divisions in actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not implemented.

Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A carbonization-free laser machining system for a metal endless belt, comprising, in order along an optical path:

2. A carbonization-free laser machining system for an endless metal belt as claimed in claim 1, wherein said polarization controlling element has a fast axis;

3. A carbonization-free laser machining system for an endless metal belt as in claim 1, wherein said beam adjustment module comprises a plurality of sets of mirrors and scanning galvanometers;

4. A carbonization-free laser machining system for an endless belt of metal according to claim 3, characterized in that the scanning galvanometer comprises a rotating motor and a lens, the lens being provided on the rotating motor;

5. The carbonization-free laser machining system for an endless metal belt as claimed in claim 4, wherein said rotating electric machine includes an X-axis rotating electric machine and a Y-axis rotating electric machine, said lens including a first lens disposed on said X-axis rotating electric machine and a second lens disposed on said Y-axis rotating electric machine;

6. A carbonization-free laser machining system for a metal endless belt according to claim 1, further comprising a rotary table for holding the metal endless belt so that a focus spot machines the metal endless belt.

7. A carbonization-free laser machining system for an endless belt of metal according to claim 6, characterized in that the lower end of the rotary table is provided with a direct drive motor, and the rotary table is movably provided on the direct drive motor.

8. The carbonization-free laser machining system for metal endless belt according to claim 1, further comprising a water injection pipe and a rotary joint, wherein the water injection pipe is connected to the metal endless belt through the rotary joint, and is used for cooling the machined metal endless belt.

9. A carbonization-free laser machining method for a metal endless belt, comprising:

expanding the first femtosecond laser beam through a beam expander;

10. The carbonization-free laser machining method for metal endless belt according to claim 9, characterized in that the changing the transmission direction and angle of the second femtosecond laser beam according to the beam adjustment module forms a third femtosecond laser beam, comprising:

acquiring space position information of the metal endless belt;