Digital light spot laser processing equipment and application thereof

Abstract

The invention relates to digitized light spot laser processing equipment and application thereof. The digitized light spot laser processing equipment comprises a laser processing lens and a thermal imager which are arranged in a matched mode. The laser processing lens is used for accessing laser beams of an array through a light inlet, performing collimation processing through a collimation module, performing output light spot regularization processing on each laser beam through a micro-lens array homogenizing and shaping module, and outputting processed array laser spots through a light outlet; a controller is arranged in cooperation with the laser beam of the laser generation array and the thermal imager; the controller adjusts the partition output of the laser generation array based on a feedback signal of the thermal imager; the lens is applied to laser processing of components with symmetric heat transfer characteristics and asymmetric heat transfer characteristics. According to the method, the surface temperature uniformity of a complex component can be ensured, the surface hardness of a workpiece and the uniformity of tissue distribution are improved, meanwhile, the method is suitable for various machining devices, light spot energy of all units is evenly distributed, and independent control over the light spot energy of the units is achieved through an external controller.

Description

Technical Field

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

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

[0003] During the laser processing, the processing of a class of complex components is relatively difficult. These complex components include but are not limited to blades, rails, bearings, etc., which have asymmetric heat transfer characteristics such as variable cross-sections, special-shaped surfaces, and variable curvatures. After enduring service conditions such as alternating heavy loads, frequent impacts, fatigue wear, etc., 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] At present, the main treatment method is laser surface strengthening.

[0005] The Chinese patent with publication number CN112501606A discloses "a laser spot shaping device and a method for preparing a single-layer cladding 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 of a certain shape and size. Although this improves the processing efficiency, it uses a diffractive optical element to achieve the change of the spot shape, which has low flexibility. At the same time, when the optical system is used to perform laser large-area strengthening on complex workpieces, the consistency of the surface temperature of the workpiece cannot be guaranteed, resulting in poor uniformity of the surface performance of the workpiece.

[0006] A Chinese patent with publication number CN116774534A discloses "a device for generating a point light spot array", which includes a first stepped reflector and a second stepped reflector; the first stepped reflector divides the reflected light beam of the incident light beam into a sheet light beam through steps and reflects the sheet light beam to the second stepped reflector; the second stepped reflector is arranged along the reflection direction of the first stepped reflector, and the sheet light beam reflected by the first stepped reflector is incident on the second stepped reflector, and the second stepped reflector divides the reflected light of the incident sheet light beam into a point light spot array through steps; it can generate point light spot arrays of different shapes and sizes to meet different processing shapes, but each light spot cannot be individually controlled. When laser strengthening is performed on a large area, the consistency of surface temperature cannot be achieved, which will affect the performance of the processed part.

[0007] There is also the "Research on Laser Cladding Rectangular Homogenized Spot Optical System" proposed by Huazhong University of Science and Technology, which can transform the circular Gaussian spot into a large flat-top rectangular spot, greatly improving the processing efficiency. However, this type of spot is prone to overheating or underheating when processing complex components, resulting in uneven structure of the strengthening layer and unstable mechanical properties. At the same time, it can only realize 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, while ensuring the consistency of surface temperature and improving processing quality and efficiency.

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

[0010] A light inlet, arranged in conjunction with a laser generating array, for receiving a laser beam from the array;

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

[0012] The microlens array homogenization and shaping module is used to regularize the output light spot of each laser beam after the collimation process;

[0013] A light outlet, used to output the processed arrayed laser spot;

[0014] The light inlet, the collimation module, the microlens array homogenization and shaping module and the light outlet are arranged in sequence;

[0015] A controller is provided in conjunction with the laser beam 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 comprises 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 each of the laser generators, and all the sub-controllers cooperate with the controller;

[0017] The collimation module includes collimating mirrors that correspond to the arrayed laser generators one by one and are coaxial, all the collimating mirrors are parallel, and all the incident ends and the exit ends of the collimating mirrors are flush with each other;

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

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

[0020] 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 ;

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

[0022] 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.

[0023] Preferably, corresponding to any laser beam irradiation area, the temperature deviation rate is obtained , 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.

[0024] Preferably, 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.

[0025] 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, 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.

[0026] Preferably, 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 sequentially and parallel to the first microlens array sheet group and the second microlens array sheet group.

[0027] Preferably, the light outlet includes an output protection mirror arranged corresponding to the laser generating array.

[0028] An application of the digital spot laser processing equipment 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 processing area into zones and set the arrangement of the laser array according to the zone conditions;

[0030] 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;

[0031] 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;

[0032] 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.

[0033] 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;

[0034] 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;

[0035] 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;

[0036] 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;

[0037] 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.

[0038] The invention relates to a digital spot laser processing device and an application thereof. The laser processing device comprises a laser processing lens and a thermal imager which are arranged in coordination. The laser processing lens is connected to the laser beam of the array through a light inlet arranged in coordination with a laser generating array, a collimation module is used to collimate each laser beam input at the light inlet, a microlens array homogenization and shaping module is used to regularize the output spot of each laser beam after the collimation, and a light outlet is 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, and a controller is provided in coordination with the laser beam 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. The lens is applied to the laser processing of components with symmetrical heat transfer characteristics and asymmetrical heat transfer characteristics.

[0039] The present invention solves the problems of complex spot shape transformation, uniform energy distribution of large-size spots, difficulty in regulating dot-matrix spots individually, and difficulty in coupling multiple processing technologies during laser processing. Its beneficial effects are:

[0040] (1) The light spot is arrayed in two dimensions, and the power density of each unit light spot can be independently and steplessly adjusted, so that the energy distribution and shape of the light spot array can be precisely customized according to the shape of the complex curved surface. This can not only ensure the uniformity of the surface temperature of complex components, improve the surface hardness and uniformity of the structure distribution of the workpiece, but also be suitable for a variety of processing equipment;

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

[0042] (3) Independent control of the unit spot energy is achieved through an external controller. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0044] Figure 2 Schematic diagram of the optical path of the lens in the present invention;

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

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

[0047] Figure 5 It is a schematic diagram of the whole device in the application process of the present invention;

[0048] Figure 6 It is an application flow chart of the present invention;

[0049] Figure 7 Schematic diagram of the effect of achieving unit light spot emitting light or not emitting light in different areas in an embodiment of the present invention, wherein (a) is the original workpiece, (b) is the top view of the original workpiece, (c) is a schematic diagram of light spots in different areas of the workpiece being processed, and (d) is the top view of (c). DETAILED DESCRIPTION

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

[0051] like Figure 1 , Figure 2The present invention relates to a digital spot laser processing device, the laser processing device comprises a laser processing lens 2 and a thermal imager 17 which are arranged in a coordinated manner; the laser processing lens 2 comprises:

[0052] A light inlet, arranged in conjunction with the laser generating array 9, for receiving the laser beam of the array;

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

[0054] The microlens array homogenization and shaping module is used to regularize the output light spot of each laser beam after the collimation process;

[0055] The light outlet 8 is used to output the processed arrayed laser spot;

[0056] The light inlet, the collimation module 4, the microlens array homogenization and shaping module and the light outlet 8 are arranged in sequence;

[0057] A controller 1 is provided to cooperate with the laser beam of the laser generating array 9 and the thermal imager; the controller 1 adjusts the partition output of the laser generating array 9 based on the feedback signal of the thermal imager.

[0058] The laser generating array 9 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.

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

[0060] A water cooling device is also provided corresponding to any of the laser generators.

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

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

[0063] Specifically, the present invention provides an embodiment;

[0064] like Figure 4 , Figure 5 As shown, the machining start coordinate (x 0 , 0) and processing stroke x;

[0065] Then controlling the output of the sub-controller comprises 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, a thermal imager is used to monitor and collect the surface temperature of each laser heat treatment zone in real time, and the temperature transfer function is used to calculate the surface temperature of each zone. Calculate the temperature of the processing area. Generally, the temperature transfer function of laser processing is a first-order transfer function, satisfying

[0068]

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

[0070] The data collected by the thermal imager were curve fitted using the Newton interpolation method, and K=0.217, T=2.84 were obtained;

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

[0072] Here, the calculated temperature of each unit area (T 1 、T 2 、T 3 ……T i ) are respectively related to the preset temperature threshold T 0 Compare, and then adjust the laser power corresponding to the area through the control system according to the comparison result; the preset value here is generally set to 2%, that is, fuzzy PID control is required;

[0073] S2.3 The PID parameters are adjusted in real time online using fuzzy PID and fed back to the corresponding optical fiber of the laser generating array.

[0074] Corresponding to any laser beam irradiation area, obtain the temperature deviation rate , 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.

[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 system's adaptability, reduce the system's rise time and adjustment time, and reduce the steady-state error; the control output of the PID controller meets,

[0076]

[0077] Where e(t) is the deviation between the set value and the measured value, , and They are proportional gain, integral coefficient and differential coefficient respectively;

[0078] Fuzzy PID adds a fuzzy module to the traditional PID control system, taking the deviation e and the rate of change of the deviation ec as input, and using fuzzy control rules to output , and Adjustment amount , and , so as to adjust the PID parameters in real time online to meet the following requirements:

[0079]

[0080]

[0081]

[0082] When the area temperature T fed back by the thermal imager i When the start-up requirements of the control system are met, the fuzzy PID control module starts working to control the laser power. At the same time, the thermal imager monitors the temperature in real time and provides feedback, realizing the real-time input of the temperature deviation e and the rate of change of the deviation ec, thereby adjusting the PID parameters online in real time to achieve automatic temperature control.

[0083] Furthermore, taking 15 sub-controllers as an example, the PID controls of the 15 sub-controllers are relatively independent. All sub-controllers work in parallel, but with different control ranges. Each controller handles the temperature change control of the corresponding area. However, considering the thermal interaction between adjacent spots, the adjustment of the laser power of a sub-controller will affect the temperature of its adjacent area. Therefore, for any irradiation area of ​​the laser beam, the temperature deviation rate is obtained. In practical applications, when the temperature deviation rate in this area >50%, 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. Otherwise, the thermal imager transmits multi-channel temperature signal data to the controller, and each sub-controller processes it according to the corresponding relationship and outputs multiple control signals to control the laser power.

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

[0085] The collimation module 4 includes collimating mirrors 10 that correspond to the arrayed laser generators one by one and are coaxial. All the collimating mirrors 10 are parallel, and the incident ends and the emitting ends of all the collimating mirrors 10 are flush with each other.

[0086] The light outlet 8 includes an output protection mirror arranged corresponding to the laser generating array 9 .

[0087] In the present invention, the collimating lens 10 is equipped with a corresponding protective lens, and all the collimating lenses 10 are arranged in an array in the same plane and are coaxially arranged one by one with the laser generator. The corresponding arrangement here means that each laser generator is fixed to the corresponding collimating lens 10 of the collimating module 4 through an interface, or is fixed in the form of an array.

[0088] In the present invention, the output protection mirror corresponding to the light outlet 8 is similar to the protection mirror corresponding to the collimating mirror 10 , which is easily understood by those skilled in the art.

[0089] like Figure 3 As shown, the microlens array homogenization 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 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 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 sheet 11 (12) and the second one-dimensional microlens array sheet 13 (14) 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 11 (12) and the second one-dimensional microlens array sheet 13 (14) are arranged vertically.

[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 sequentially and parallel to the first microlens array sheet group 5 and the second microlens array sheet group 6.

[0092] Here, the application of the microlens array homogenization and shaping module is described in combination with the application and steps of the present invention.

[0093] like Figure 6As shown, the present invention also relates to an application of the digital spot laser processing equipment, which is applied to laser processing of components with symmetrical heat transfer characteristics and asymmetrical heat transfer characteristics; comprising 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; divide the processing area into zones, and set the arrangement of the laser array 9 from 1×1 to 3×5 according to the zone conditions;

[0095] S2.2 Each laser beam of the laser generating array 9 generates a laser beam. The cross section of the laser beam here is generally circular. All laser beams are arranged in an array and pass through the collimation module 4 to form an array collimated parallel beam. The Z-axis direction position, the spot size and the overlap area size between unit spots can be adjusted here;

[0096] 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 being a rectangular shape, and then output through the light outlet 8, forming an array light spot arranged in a set shape in the area to be processed;

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

[0098] After the array collimated parallel light beam of S2.2 passes through the two first one-dimensional microlens array sheets 11 (12) in sequence, each unit light beam in the Y-axis direction is divided into a number of small light beams, which are focused by the first array focusing mirror 15 to achieve the transformation from the circular light spot in the Y-axis direction to the uniform rectangular light spot. Similarly, the light beam passes through the two second one-dimensional microlens array sheets 13 (14) and the second array focusing mirror 16 to achieve the transformation from the circular light spot in the X-axis direction to the uniform rectangular light spot, and then obtains a set shape, such as a rectangular array light spot, on the processing surface of the workpiece 3.

[0099] S2.4 According to the changes of the area to be processed during the processing, the controller 1 independently controls each laser beam of the laser generating array 9, so as to obtain the corresponding array light spot 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, 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 for global temperature monitoring. Generally speaking, the thermal imager is set on the side of the workpiece 3;

[0101] When the surface shape of the workpiece 3 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 spot output by one or more laser beams;

[0102] When there is a protrusion on the surface of the workpiece 3, the thermal imager detects that the surface temperature rises, and then reduces the power of the laser beam corresponding to the current position;

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

[0104] Until the processing platform moves along the preset direction until the workpiece 3 to be processed completely leaves the area covered by 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 the 2kW laser generator in a 2×5 rectangular array, and forms an array collimated parallel beam after being transformed by the corresponding collimator 10, and then forms a 2×5 closely packed rectangular array beam through the microlens array homogenization and shaping module, and the surface of the workpiece 3 to be processed is 300mm away from the light emitting surface of the optical fiber; the basic parameters of the lens in the microlens array homogenization and shaping module of the example are shown in Table 1;

[0106] Table 1 Basic parameters of lens

[0107]

[0108] In the implementation process, the parameters of M1 and M2 (the first one-dimensional microlens array sheet) are the same, and the size in this direction can be adjusted by the spacing between the two, so as to facilitate the arrangement and adjustment of adjacent light spots. The same is true for M3 / M4 (the second one-dimensional microlens array sheet); L1 and L2 are the first array focusing mirror 15 and the second array focusing mirror 16. The data of L1 needs to refer to the parameters of M1 and M2. Since the final light spot size is clear, the focal length is confirmed by considering the overall size of the laser head, and the curvature of L1 is determined accordingly. The data of L2 refers 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 "2" in the array. Similarly, the convex arc of L2 is 5;

[0110] The above example can realize 2×5 rectangular light spots with a side length of 15 mm, which are densely distributed in an array. The energy of each unit light spot is evenly distributed and the energy density is individually adjustable.

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

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

[0113] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which 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 in conjunction with the laser beam 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.

2. The digital spot laser processing equipment according to claim 1 is characterized in that: The laser generating array comprises 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 each of the laser generators, and all the sub-controllers cooperate with the controller; The collimation module includes collimating mirrors that correspond to the arrayed laser generators one by one and are coaxial, 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 3 is characterized in that: Corresponding to any laser beam irradiation area, obtain the temperature deviation rate , 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.

5. 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.

6. The digital spot laser processing equipment according to claim 5 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.

7. The digital spot laser processing equipment according to claim 5 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.

8. An application of the digital spot laser processing equipment according to any one of claims 1 to 7, 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.

9. The application of the digital spot laser processing equipment according to claim 8 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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