A digital spot laser processing device and its application

Abstract

The present invention relates to a digital spot laser processing device and its application, including a cooperatively arranged laser processing lens and a thermal imager; the laser processing lens accesses an array of laser beams through an incident light port, performs collimation processing with a collimation module, and uses a microlens array homogenization and shaping module to regularize the output spots of each laser beam, and the processed arrayed laser spots are output from the light exit port; a controller is provided in cooperation with the laser beams of the laser generation array and the thermal imager; the controller adjusts the partitioned output of the laser generation array based on the feedback signal of the thermal imager; the lens is applied to the laser processing of components with symmetric heat transfer characteristics and asymmetric heat transfer characteristics. The present invention can ensure the surface temperature uniformity of complex components, improve the surface hardness and the uniformity of the tissue distribution of the workpiece, and at the same time is applicable to a variety of processing devices, with uniform energy distribution of each unit spot, and realizes the independent control of the energy of each unit spot through an external controller.

Description

Technical Field

[0001] The present invention relates to the technical field of brazing or desoldering; welding; coating or plating by brazing or welding methods; local heating cutting, such as flame cutting; and laser beam processing, and particularly relates to a digital spot laser processing device and its application. Background Art

[0002] Laser processing utilizes the energy of light to reach a very high energy density at the focus after being focused by a lens, and can achieve the purpose of processing various metals and non-metals, and can also process materials with high hardness, high brittleness and high melting point.

[0003] During the laser processing process, the processing of a class of complex components is relatively difficult. These complex components include, but are not limited to, blades, tracks, bearings, etc. They have asymmetric heat transfer characteristics such as variable cross-sections, special-shaped surfaces, and variable curvatures. After being subjected to service conditions such as alternating heavy loads, frequent impacts, and fatigue wear, how to improve their surface performance, repair their damaged parts, and increase their service life through laser processing has become an urgent problem to be solved.

[0004] For this, the current main treatment method is laser surface strengthening.

[0005] Chinese Patent with Publication No. CN112501606A discloses "a laser spot shaping device and a method for preparing a single-layer clad layer". It sets laser process parameters and uses a laser spot shaping device to focus and shape the laser beam into a flat-top spot with a certain shape and size. Although this improves the processing efficiency, it uses diffractive optical elements to change the spot shape, with low flexibility. At the same time, when using this optical system for large-area laser strengthening of complex workpieces, the consistency of the surface temperature of the workpiece to be processed cannot be guaranteed, resulting in poor uniformity of the surface performance of the workpiece.

[0006] Chinese Patent with Publication No. CN116774534A discloses "a point spot array generating device", which includes a first stepped mirror and a second stepped mirror. The first stepped mirror divides the reflected beam of the incident beam through steps to form a sheet beam and reflects the sheet beam to the second stepped mirror. The second stepped mirror is arranged along the reflection direction of the first stepped mirror. The sheet beam reflected by the first stepped mirror is incident on the second stepped mirror, and the second stepped mirror divides the reflected light of the incident sheet beam through steps to form a point spot array. It can generate point spot arrays with different shapes and sizes to meet different processing shapes, but each spot cannot be individually regulated. When performing large-area laser strengthening, the consistency of the surface temperature cannot be achieved, which will affect the performance of the workpiece to be processed.

[0007] In addition, Huazhong University of Science and Technology proposed the "Research on Optical System for Laser Cladding Rectangular Homogenized Spot", which can transform the circular Gaussian spot into a flat-top rectangular large spot, greatly improving the processing efficiency. However, such spots are prone to overheating or underheating phenomena during the processing of complex components, resulting in unevenness of the strengthening layer structure and instability of mechanical properties. At the same time, it can only implement one laser processing technology and has poor compatibility. Summary of the Invention

[0008] The present invention solves the problems existing in the prior art and provides a digital spot laser processing system and its application, which can perform large-area laser strengthening on complex components, ensure the consistency of surface temperature at the same time, and improve the processing quality and efficiency.

[0009] The technical solution adopted by the present invention is a digital spot laser processing device, and the laser processing device includes a laser processing lens and a thermal imager arranged in cooperation; the laser processing lens includes:

[0010] An incident light port, arranged in cooperation with a laser generating array, for accessing the laser beams of the array;

[0011] A collimation module, used for collimating each laser beam input at the incident light port;

[0012] A microlens array homogenization and shaping module, used for regularizing the output spots of each laser beam after collimation processing;

[0013] An output light port, used for outputting the processed arrayed laser spots;

[0014] The incident light port, the collimation module, the microlens array homogenization and shaping module, and the output light port are arranged in sequence in cooperation;

[0015] A controller is provided in cooperation with the laser beams of the laser generating array and the thermal imager; the controller adjusts the partition output of the laser generating array based on the feedback signal of the thermal imager.

[0016] Preferably, the laser generating array includes laser generators arranged in an array, the light-emitting end faces of all the laser generators are flush, and the laser beams output by all the laser generators are parallel; a corresponding sub-controller is provided for any one of the laser generators, and all the sub-controllers cooperate with the controller;

[0017] The collimation module includes collimating mirrors corresponding one-to-one and coaxially with the arrayed laser generators, all the collimating mirrors are parallel, and the incident ends and the exit ends of all the collimating mirrors are correspondingly flush;

[0018] A water cooling device is also provided for any one of the laser generators.

[0019] Preferably, controlling the output of the sub-controller includes the following steps:

[0020] S1.1 The thermal imager acquires the average temperature T of each output calculation partition corresponding to the laser emission array in real time i ;

[0021] S1.2 Based on T i and the preset temperature threshold T 0 , if is greater than the preset value, proceed to the next step, otherwise repeat S1.1;

[0022] S1.3 Use fuzzy PID to adjust the PID parameters online in real time and feedback to the sub-controller of the corresponding optical fiber of the laser emission array.

[0023] Preferably, for the irradiation area of any laser beam, obtain the temperature deviation rate , where is the deviation between the temperature set value and the measured value. When

[0024] is greater than the preset value, synchronously adjust the power of the sub-controller of the adjacent laser beam corresponding to the current laser beam, and the priority is higher than the corresponding PID instruction.

[0025] Preferably, the microlens array homogenization and shaping module includes a first microlens array sheet group, a second microlens array sheet group and a corresponding array focusing lens group arranged in parallel in sequence; the microlens array homogenization and shaping module is perpendicular to the laser incident direction of the laser emission array.

[0026] Preferably, the first microlens array sheet group includes one or more first one-dimensional microlens array sheets arranged in parallel, the second microlens array sheet group includes one or more second one-dimensional microlens array sheets arranged in parallel, both the first one-dimensional microlens array sheet and the second one-dimensional microlens array sheet include a plurality of parallel and uniformly distributed strip-shaped light-transmitting lenses, and the strip-shaped light-transmitting lenses of the first one-dimensional microlens array sheet and the second one-dimensional microlens array sheet are perpendicularly arranged.

[0027] Preferably, the array focusing lens group includes a first array focusing lens cooperating with the first microlens array sheet group and a second array focusing lens cooperating with the second microlens array sheet group. The first array focusing lens and the second array focusing lens are arranged in sequence and are parallel to the first microlens array sheet group and the second microlens array sheet group.

[0028] An application of the digital spot laser processing equipment described above includes the following steps:

[0029] S2.1 Clean the surface of any workpiece to be processed and place it on the processing platform; divide the area to be processed and set the arrangement of the laser generation array according to the division situation.

[0030] S2.2 Each laser beam of the laser generation array generates a laser beam, and all the laser beams are arranged in an array and pass through the collimation module to form an array of collimated parallel beams.

[0031] S2.3 The array of collimated parallel beams passes through the micro-lens array homogenization and shaping module in sequence, forms an array of beams with rectangular unit light spots and is output through the light outlet, and an array of light spots arranged in a set shape will be formed in the area to be processed.

[0032] S2.4 According to the change of the area to be processed during the processing, the controller independently controls each laser beam of the laser generation array, and then obtains the corresponding array of light spots on each area to be processed.

[0033] In S2.4, control the processing platform to move along the preset direction, keep the spatial position of the array of light spots, and at the same time turn on the thermal imager for global temperature monitoring.

[0034] When the shape of the workpiece surface entering the coverage area of the array of light spots changes, analyze the temperature data of the thermal imager by the controller to change the arrangement and / or shape of the light spots output by one or more laser beams.

[0035] When there is a protrusion on the workpiece surface and the thermal imager detects an increase in surface temperature, reduce the power of the laser beam corresponding to the current position.

[0036] When there is a depression on the workpiece surface and the thermal imager detects a decrease in surface temperature, increase the power of the laser beam corresponding to the current position.

[0037] Until the processing platform moves along the preset direction until the workpiece to be processed completely leaves the coverage area of the array of light spots.

[0038] The present invention relates to a digital light spot laser processing device and its application. The laser processing device includes a laser processing lens and a thermal imager that are cooperatively arranged; the laser processing lens accesses the laser beams of the array through the light inlet arranged in cooperation with the laser generation array, collimates each laser beam input at the light inlet through the collimation module, regularizes the output light spots of each laser beam after collimation processing through the micro-lens array homogenization and shaping module, and outputs the processed array of laser light spots through the light outlet; the light inlet, the collimation module, the micro-lens array homogenization and shaping module, and the light outlet are sequentially cooperatively arranged, and a controller is provided for the laser beams of the laser generation array and the thermal imager; the controller adjusts the partition output of the laser generation array based on the feedback signal of the thermal imager; the lens is applied to the laser processing of components with symmetric heat transfer characteristics and asymmetric heat transfer characteristics.

[0039] The present invention solves problems such as complex transformation of the laser beam spot shape during laser processing, uniform energy distribution of large-sized spots, difficulty in independently controlling dot matrix spots, and difficulty in coupling multiple processing technologies. Its beneficial effects are as follows:

[0040] (1) The laser beam spot is made into a two-dimensional array, and the power density of each unit spot can be independently and steplessly adjusted, enabling the energy distribution and shape of the spot array to be precisely customized according to the shape of the complex surface. This can not only ensure the temperature uniformity on the surface of complex components, improve the surface hardness of the workpiece and the uniformity of the tissue distribution, but also be applicable to a variety of processing equipment;

[0041] (2) For the homogenization and shaping process of the laser beam spot, a microlens array homogenization and shaping module is used to achieve the rectangularization and splicing shape of the unit spots, and the energy of each unit spot is evenly distributed;

[0042] (3) Through an external controller, independent control of the energy of the unit spots is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic structural diagram of the lens in the present invention;

[0044] Figure 2 It is a schematic optical path diagram of the lens in the present invention;

[0045] Figure 3 It is a schematic diagram of the microlens array homogenization and shaping module in the present invention;

[0046] Figure 4 It is a flowchart of the output of the control sub-controller in the present invention;

[0047] Figure 5 It is a schematic diagram of the overall equipment during application in the present invention;

[0048] Figure 6 It is an application flowchart in the present invention;

[0049] Figure 7 It is a schematic diagram of the effect of achieving light output or non-light output of unit spots in different regions in the embodiment of the present invention, where (a) is the original workpiece, (b) is the top view of the original workpiece, (c) is the schematic diagram of the spots in different regions of the workpiece during processing, and (d) is the top view of (c). DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] The present invention will be further described in detail below in conjunction with embodiments, but the protection scope of the present invention is not limited thereto.

[0051] Such as Figure 1 、 Figure 2The present invention relates to a digital spot laser processing device, and the laser processing device includes a cooperatively arranged laser processing lens 2 and an infrared thermal imager 17; the laser processing lens 2 includes:

[0052] An incident light port, arranged in cooperation with a laser generating array 9, for accessing the laser beams of the array;

[0053] A collimation module 4, for collimating each laser beam input at the incident light port;

[0054] A microlens array homogenizing and shaping module, for regularizing the output spots of each laser beam after collimation processing;

[0055] An output light port 8, for outputting the processed arrayed laser spots;

[0056] The incident light port, the collimation module 4, the microlens array homogenizing and shaping module, and the output light port 8 are arranged in sequence and cooperate with each other;

[0057] A controller 1 is provided in cooperation with the laser beams of the laser generating array 9 and the infrared thermal imager; the controller 1 adjusts the zonal output of the laser generating array 9 based on the feedback signal of the infrared thermal imager.

[0058] The laser generating array 9 includes laser generators arranged in an array, the light output end faces of all the laser generators are flush, and the laser beams output by all the laser generators are parallel.

[0059] A corresponding sub-controller is provided for any one of the laser generators, and all the sub-controllers cooperate with the controller 1;

[0060] A water cooling device is further provided for any one of the laser generators.

[0061] In the present invention, the laser generating array 9 is composed of multiple fiber laser generators, and the light output end faces of all the laser generators are arranged in a plane according to a set array. Generally, the set array range of the laser generators is 1×1~3×5.

[0062] In the present invention, the controller 1 is mainly for temperature control. In practical applications, the surface temperature can be monitored in real time by installing an infrared thermal imager and transmitted to the controller 1, and compared with the threshold value set in the controller 1, so as to control each sub-controller to adjust the unit laser power.

[0063] Specifically, an embodiment of the present invention is given;

[0064] As Figure 4 、 Figure 5 shown, the processing start coordinate (x 0 , 0) and the processing stroke x are set according to the size of the workpiece 3;

[0065] Subsequently, control the output of the sub-controller, including the following steps:

[0066] S2.1 The thermal imager obtains the average temperature T of each output calculation partition corresponding to the laser generation array in real time i ;

[0067] Here, the surface temperature of each partition of the laser heat treatment is monitored and collected in real time by the thermal imager, and the temperature of the processing area is calculated according to the temperature transfer function The temperature transfer function of general laser processing is a first-order transfer function, which satisfies

[0068]

[0069] In the formula, K is the system gain coefficient, that is, the output value after the system is stable, T is the time constant, that is, the time required for the system to rise to 0.623K, and s is the complex variable, indicating the frequency response of the system;

[0070] The data collected by the thermal imager is curve-fitted by the Newton interpolation method to obtain K = 0.217 and T = 2.84;

[0071] S2.2 Based on T i and the preset temperature threshold T 0 , if is greater than the preset value, proceed to the next step, otherwise repeat S2.1;

[0072] Here, the temperatures of each unit area (T 1 , T 2 , T 3 ……T i ) calculated are respectively compared with the preset temperature threshold T 0 , and then the laser power corresponding to this area is adjusted through the control system according to the comparison result; the preset value here is generally set to 2%, that is, fuzzy PID needs to be used for control;

[0073] S2.3 Use fuzzy PID to adjust the PID parameters in real time online and feedback to the corresponding optical fiber of the laser generation array.

[0074] For the irradiation area corresponding to any laser beam, obtain the temperature deviation rate , is the deviation between the temperature set value and the measured value. When is greater than the preset value, the sub-controller of the adjacent laser beam corresponding to the current laser beam is synchronously adjusted in power and has a higher priority than the corresponding PID instruction.

[0075] In the present invention, the system adopts a fuzzy PID control method, adding a fuzzy module on the basis of traditional PID control to enhance the self - adaptability of the system, reduce the rise time and adjustment time of the system, and at the same time reduce the steady - state error; the control output of the PID controller satisfies,

[0076]

[0077] where e(t) is the deviation between the set value and the measured value, 、 and are the proportional gain, integral coefficient and derivative coefficient respectively;

[0078] While fuzzy PID adds a fuzzy module to the traditional PID control system. Taking the deviation e and the change rate ec of the deviation as inputs, it uses fuzzy control rules to output the adjustment amounts 、 and of 、 and respectively, so as to adjust the PID parameters online in real - time, and satisfy respectively,

[0079]

[0080]

[0081]

[0082] When the regional temperature T i fed back by the thermal imager reaches the opening requirement of the control system, the fuzzy PID control module starts to work, controls the laser power. At the same time, the thermal imager monitors the temperature in real - time and feeds back, realizing the real - time input of the temperature deviation e and the change rate ec of the deviation, so as to adjust the PID parameters online in real - time and realize the automatic control of the temperature.

[0083] Furthermore, taking 15 sub - controllers as an example, the PID control of the 15 sub - controllers is relatively independent. All sub - controllers work in parallel, but the control ranges are different. Each controller processes the temperature change regulation of the corresponding area. However, considering the thermal interaction between adjacent light spots, the adjustment of the laser power of one sub - controller will affect the temperature of its adjacent area. Therefore, for the irradiation area of any laser beam, the temperature deviation rate is obtained. In practical applications, when the temperature deviation rate of this area > 50%, the sub - controller of the adjacent laser beam corresponding to the current laser beam is synchronously adjusted in power and has a higher priority than the corresponding PID instruction. Otherwise, the thermal imager transmits the multi - channel temperature signal data to the controller, and after being processed by each sub - controller according to the corresponding relationship, multiple control signals are output to control the laser power.

[0084] Finally, when the workpiece 3 reaches the coordinates (x 0 + x, 0), turn off the laser.

[0085] The collimation module 4 includes collimating mirrors 10 that are in one-to-one correspondence and coaxial with the laser generators arranged in an array. All the collimating mirrors 10 are parallel, and the incident ends of all the collimating mirrors 10 are flush with each other, and the exit ends are flush with each other.

[0086] The light output port 8 includes an output protection mirror corresponding to the laser emission array 9.

[0087] In the present invention, the collimating mirror 10 is provided with a corresponding protection mirror. All the collimating mirrors 10 are arranged in an array in the same plane and are arranged in one-to-one coaxial correspondence with the laser generators. The corresponding arrangement here means that each laser generator is fixed to the corresponding collimating mirror 10 of the collimation module 4 through an interface, or fixed in the form of an array.

[0088] In the present invention, the output protection mirror provided corresponding to the light output port 8 is the same as the protection mirror of the corresponding collimating mirror 10, which is easy for those skilled in the art to understand.

[0089] As Figure 3 shown, the microlens array homogenizing and shaping module includes a first microlens array sheet group 5, a second microlens array sheet group 6 and a corresponding array focusing lens group 7 arranged in parallel in sequence; the microlens array homogenizing and shaping module is perpendicular to the laser incident direction of the laser emission array 9.

[0090] The first microlens array sheet group 5 includes one or more first one-dimensional microlens array sheets 11(12) arranged in parallel, and the second microlens array sheet group 6 includes one or more second one-dimensional microlens array sheets 13(14) arranged in parallel. The first one-dimensional microlens array sheets 11(12) and the second one-dimensional microlens array sheets 13(14) both include a plurality of long strip-shaped light-transmitting lenses arranged in parallel and evenly distributed. The long strip-shaped light-transmitting lenses of the first one-dimensional microlens array sheets 11(12) and the second one-dimensional microlens array sheets 13(14) are perpendicular to each other.

[0091] The array focusing lens group 7 includes a first array focusing lens 15 that cooperates with the first microlens array sheet group 5 and a second array focusing lens 16 that cooperates with the second microlens array sheet group 6. The first array focusing lens 15 and the second array focusing lens 16 are arranged in sequence and are parallel to the first microlens array sheet group 5 and the second microlens array sheet group 6.

[0092] The application of the microlens array homogenizing and shaping module here will be described in combination with the application and steps of the present invention.

[0093] As Figure 6As shown, the present invention also relates to an application of the digital spot laser processing equipment described above, which is applied to laser processing of components with symmetric heat transfer characteristics and asymmetric heat transfer characteristics; it includes the following steps:

[0094] S2.1 Clean the surface of any workpiece 3 to be processed to ensure that its surface meets the processing requirements, and place it on the processing platform; partition the area to be processed, and set the arrangement of the laser generation array 9 according to the partition situation, which varies from 1×1 to 3×5;

[0095] Each laser beam of the laser generation array 9 generates a laser beam. Here, the cross-section of the laser beam is generally circular, and all the laser beams are arranged in an array and pass through the collimation module 4 to form an array of collimated parallel beams; the position in the Z-axis direction, the spot size, and the overlap area size between unit spots can be adjusted here;

[0096] The array of collimated parallel beams sequentially passes through the micro-lens array homogenization and shaping module, forms an array of beams with rectangular unit spots, and then outputs through the light outlet 8, and an array of spots arranged in a set shape will be formed in the area to be processed;

[0097] Here, the first micro-lens array sheet group 5 includes two first one-dimensional micro-lens array sheets 11(12) in the X-axis direction, the second micro-lens array sheet group 6 includes two second one-dimensional micro-lens array sheets 13(14) in the Y-axis direction, the subsequent first array focusing mirror 15 is in the X-axis direction, and the second array focusing mirror 16 is in the Y-axis direction;

[0098] After the array of collimated parallel beams in S2.2 sequentially passes through the two first one-dimensional micro-lens array sheets 11(12), the unit beams in the Y-axis direction are divided into several small beams and focused by the first array focusing mirror 15 to realize the transformation of the circular spot to a uniform rectangular spot in the Y-axis direction. Similarly, through the action of the two second one-dimensional micro-lens array sheets 13(14) and the second array focusing mirror 16, the transformation of the circular spot to a uniform rectangular spot in the X-axis direction is realized, and then an array of spots with a set shape, such as a rectangle, is obtained on the processing surface of the workpiece 3.

[0099] S2.4 According to the change of the area to be processed during the processing, the controller 1 independently controls each laser beam of the laser generation array 9, and then the corresponding array of spots is obtained on each area to be processed.

[0100] The independent control here refers to adjusting and controlling the output power of each laser generator to better cope with complex working conditions. Specifically, in S2.4, control the processing platform to move along the preset direction, keep the spatial position of the array of spots, and at the same time turn on the thermal imager for global temperature monitoring. Generally, the thermal imager is set on the side of the workpiece 3;

[0101] When the surface shape of the workpiece 3 entering the coverage area of the array light spot changes, the controller analyzes the temperature data of the thermal imager to change the arrangement and / or shape of the light spots output by one or more laser beams;

[0102] When there is a protrusion on the surface of the workpiece 3 and the thermal imager detects an increase in surface temperature, the power of the laser beam corresponding to the current position is reduced;

[0103] When there is a depression on the surface of the workpiece 3 and the thermal imager detects a decrease in surface temperature, the power of the laser beam corresponding to the current position is increased;

[0104] Until the processing platform moves along the preset direction until the workpiece 3 to be processed completely leaves the coverage area of the array light spot.

[0105] As shown in the figure, in one example, the array laser 2 (including the laser generator and the lens 2) arranges 10 divergent laser beams emitted from a 2kW laser generator in a 2×5 rectangular array, and after being transformed by the corresponding collimating mirrors 10 respectively, forms an array of collimated parallel beams, and then forms a 2×5 densely arranged rectangular array beam through the micro-lens array homogenization and shaping module. The distance between the surface of the workpiece 3 to be processed and the light output surface of the optical fiber is 300mm; the basic parameters of the lenses in the micro-lens array homogenization and shaping module of the example are shown in Table 1;

[0106] Table 1 Basic parameters of the lens

[0107]

[0108] During the implementation process, the parameters of M1 and M2 (the first one-dimensional micro-lens array sheet) are the same, and the adjustment of the size in this direction can be achieved through the distance between the two, which is convenient for the adjustment of the arrangement of adjacent light spots. The same is true for M3 / M4 (the second one-dimensional micro-lens array sheet); L1 and L2 are the first array focusing mirror 15 and the second array focusing mirror 16. The data of L1 need to refer to the parameters of M1 and M2. Since the final light spot size is clear, the focal length is determined considering the overall size of the laser head, and the curvature of L1 is determined accordingly. The data of L2 refer to the parameters of M3 and M4, and the same is true for others;

[0109] In this embodiment, the preset array is 2×5, so the convex arc of L1 is 2, corresponding to the "2" in the array. Similarly, the convex arc of L2 is 5;

[0110] The above example can achieve an array of 2×5 rectangular light spots with a side length of 15mm arranged in a dense pattern, and the energy of each unit light spot is evenly distributed and the energy density can be adjusted individually.

[0111] In practical applications, each unit light spot is rectangular. Taking a rectangular light spot with a side length of 15mm as an example, as Figure 7As shown, corresponding to different positions of the I-shaped workpiece 3, the controller 1 can achieve the effect of the unit light spot emitting light or not emitting light by opening and closing different units, thereby obtaining a variety of different overall light spot shapes. Specifically, according to the surface size of the workpiece 3 to be processed, the laser light spot array is set to 2×5. As the workpiece 3 moves, the laser irradiates the concave surface, and the size of the irradiated surface becomes smaller. Then, the unit laser power is gradually increased until the lowest point of the workpiece 3, and at the same time, the two redundant unit lasers are turned off. Subsequently, the unit light spot power is gradually decreased. When the size of the irradiated surface increases, the two unit lasers are turned on again;

[0112] This method can be applied to the processing of planar or curved workpieces 3.

[0113] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A digital spot laser processing equipment, characterized by: The laser processing equipment includes a laser processing lens and a thermal imager that are arranged in a coordinated manner; the laser processing lens includes: A light inlet, arranged in conjunction with a laser generating array, for receiving a laser beam from the array; A collimation module, used for collimating each laser beam input at the light entrance; The microlens array homogenization and shaping module is used to regularize the output light spot of each laser beam after the collimation process; A light outlet, used to output the processed arrayed laser spot; The light inlet, the collimation module, the microlens array homogenization and shaping module and the light outlet are arranged in sequence; A controller is provided for the laser beam and thermal imager of the laser generating array; the controller adjusts the partition output of the laser generating array based on the feedback signal of the thermal imager; the laser generating array includes arrayed laser generators, and a corresponding sub-controller is provided for any of the laser generators, and all the sub-controllers cooperate with the controller; the temperature deviation rate is obtained for the irradiation area of ​​any laser beam , is the deviation between the temperature setting value and the measured value. If it is greater than a preset value, the sub-controller of the adjacent laser beam corresponding to the current laser beam performs synchronous power adjustment and has a higher priority than the corresponding PID instruction.

2. The digital spot laser processing equipment according to claim 1 is characterized in that: The light-emitting end faces of all the laser generators are flush, and the laser beams output by all the laser generators are parallel; The collimation module includes collimating mirrors corresponding to the arrayed laser generators and coaxially, all the collimating mirrors are parallel, and all the incident ends and the exit ends of the collimating mirrors are flush with each other; A water cooling device is also provided corresponding to any of the laser generators.

3. The digital spot laser processing equipment according to claim 2 is characterized in that: Controlling the output of the sub-controller comprises the following steps: S1.1 The thermal imager obtains the average temperature T of each output calculation partition corresponding to the laser generation array in real time i ; S1.2 Based on T i With the preset temperature threshold T0, if If it is greater than the preset value, proceed to the next step, otherwise repeat S1.1; S1.3 The PID parameters are adjusted in real time online using fuzzy PID and fed back to the sub-controller of the corresponding optical fiber of the laser generating array.

4. The digital spot laser processing equipment according to claim 1 is characterized in that: The microlens array homogenization and shaping module comprises a first microlens array sheet group, a second microlens array sheet group and a corresponding array focusing lens group which are arranged in parallel in sequence; the microlens array homogenization and shaping module is perpendicular to the laser incident direction of the laser generating array.

5. The digital spot laser processing equipment according to claim 4 is characterized in that: The first microlens array sheet group includes two first one-dimensional microlens array sheets arranged in parallel, and the second microlens array sheet group includes two second one-dimensional microlens array sheets arranged in parallel. The first one-dimensional microlens array sheet and the second one-dimensional microlens array sheet both include a plurality of parallel and evenly distributed long strips of light-transmitting mirrors, and the long strips of light-transmitting mirrors of the first one-dimensional microlens array sheet and the second one-dimensional microlens array sheet are arranged vertically.

6. The digital spot laser processing equipment according to claim 4 is characterized in that: The array focusing lens group includes a first array focusing lens matched with the first microlens array sheet group and a second array focusing lens matched with the second microlens array sheet group. The first array focusing lens and the second array focusing lens are arranged in sequence and parallel to the first microlens array sheet group and the second microlens array sheet group.

7. An application of the digital spot laser processing equipment according to any one of claims 1 to 6, characterized in that: The following steps are involved: S2.1 Clean the surface of any workpiece to be processed and place it on the processing platform; divide the processing area into zones and set the arrangement of the laser array according to the zone conditions; S2.2 Each laser beam of the laser generating array generates one laser beam, and all the laser beams are arranged in an array and pass through the collimation module to form an array collimated parallel beam; S2.3 The array collimated parallel light beam passes through the microlens array homogenization and shaping module in sequence to form an array light beam with each unit spot as a rectangle, and then outputs through the light outlet, forming an array light spot arranged in a set shape in the area to be processed; S2.4 Based on the changes of the area to be processed during the processing, the controller independently controls each laser beam of the laser generating array, thereby obtaining the corresponding array light spot on each area to be processed.

8. The application of the digital spot laser processing equipment according to claim 7 is characterized in that: In S2.4, the processing platform is controlled to move along the preset direction, the array spot maintains the spatial position, and the thermal imager is turned on to monitor the global temperature; When the shape of the surface of the workpiece entering the area covered by the array spot changes, the controller analyzes the temperature data of the thermal imager to change the arrangement and / or shape of the spots output by one or more laser beams; When there is a protrusion on the workpiece surface, the thermal imager detects that the surface temperature rises, and then reduces the power of the laser beam corresponding to the current position; When there is a depression on the workpiece surface, the thermal imager detects that the surface temperature has dropped, and the power of the laser beam corresponding to the current position is increased; Until the processing platform moves along the preset direction until the workpiece to be processed completely leaves the area covered by the array light spot.

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