Laser processing process simulation device suitable for synchrotron radiation multi-technology combination

Abstract

The invention relates to the technical field of laser forming, and particularly discloses a laser processing process simulation device suitable for synchrotron radiation multi-technology combination, which comprises a laser, a galvanometer system, a workbench, a first lifting assembly, a second lifting assembly, a control system and a monitoring system, the laser is used for providing laser for the galvanometer system; the workbench comprises a sealed cabin, a sample table, a galvanometer machining head and a machining head lifting module, and the galvanometer machining head is arranged on the machining head lifting module; the sample table is used for placing a to-be-processed sample; the sealed cabin is used for creating a closed space to isolate a to-be-processed sample from air; the sealed cabin is positioned below the galvanometer system; the laser machining process simulation device suitable for synchrotron radiation multi-technology combination can be used for synchrotron radiation X-ray multi-technology combination in-situ and ex-situ experiments, the real-time temperature of a molten pool and X-ray diffraction and imaging pictures of the molten pool are obtained, and therefore the internal mechanism of laser forming machining is revealed by monitoring the melting and solidification processes in real time.

Description

Technical Field

[0001] The present invention relates to the field of laser forming technology, and in particular to a laser processing process simulation device suitable for the combined use of multiple technologies using synchrotron radiation. Background Art

[0002] Laser processing technology such as laser additive manufacturing is one of the key technologies of intelligent manufacturing and has become the focus of research and application promotion in the manufacturing field. Among them, the processing technology determines the quality of laser processed products. How to further improve product quality has become the focus of related research. Laser additive manufacturing is a high-energy heat source processing process involving rapid melting and non-equilibrium rapid solidification of metals. The evolution of the molten pool, metal evaporation and sputtering behavior, and solidification process during the melting process will affect the formation of defects. The material structure after solidification will also affect the product performance. These processes are all affected by the laser processing process parameters. Therefore, it is very important to explore the influence of processing parameters on the evolution of the molten pool, metal evaporation behavior, and solidification process. The post-processing research method can only infer the evolution of the material during laser processing by observing the material structure and performance, and cannot obtain the material information during the processing process in real time. Therefore, an in-situ experimental method is needed to monitor the melting and solidification process of the material during laser processing in real time, thereby revealing the melting and solidification mechanism.

[0003] Among the many in-situ process monitoring methods, synchrotron radiation high-energy X-ray technology, which has the advantages of high flux, strong penetration ability, and high time resolution, has unique advantages in studying the rapid melting and solidification process of laser processing. Synchrotron radiation high-energy X-rays can penetrate millimeter-level or even centimeter-level liquid or solid samples, can obtain atomic-level resolution material structure information on a millisecond time scale, and can track the changes in material structure during laser processing in real time. However, the synchrotron radiation X-ray light source has high radiation, is immovable, and occupies a large space. The signals generated by the interaction of other accessories of the industrial-grade laser forming device with the X-rays will interfere with the X-ray signals generated by the test samples. These factors make it impossible for traditional industrial-grade laser forming devices to be directly used for testing and research. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a laser processing process simulation device suitable for the combined use of synchrotron radiation multiple technologies, which can monitor the formation and evolution behavior of molten pools, pores, solidification cracks, etc. and typical experimental phenomena of material phase change.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] A laser processing simulation device suitable for synchrotron radiation multi-technology combination includes: a laser, a galvanometer system, a sealed cabin, a first lifting component, a second lifting component, a control system and a monitoring system.

[0007] The laser is used to provide laser light for the galvanometer system.

[0008] The first lifting assembly is used to adjust the height of the galvanometer system.

[0009] A sample stage is arranged in the sealed cabin.

[0010] The second lifting assembly is used to adjust the height of the sealed cabin.

[0011] The sample stage is used for placing samples to be processed.

[0012] The sealed cabin is used to create a closed space to isolate the sample to be processed from the air or to protect the atmosphere environment.

[0013] The sealed cabin is provided with a glove interface, and the workpiece can be manually fine-tuned when the sealed cabin is sealed.

[0014] The sealed cabin is located below the galvanometer system, and the galvanometer system is used to adjust the spot size and focal length of the laser so that the laser acts on the sample to be processed placed on the sample stage.

[0015] The monitoring system is used to obtain the real-time temperature of the molten pool and the real-time processing image in the sealed cabin in real time.

[0016] The workbench, the first lifting assembly, the second lifting assembly and the monitoring system are all electrically connected to the control system.

[0017] The laser processing simulation device suitable for the combined use of multiple technologies using synchrotron radiation provided in at least one embodiment of the present disclosure also includes: a cooling system for dissipating heat from the laser and / or galvanometer system.

[0018] In the laser processing simulation device applicable to the combination of synchrotron radiation and multiple technologies provided in at least one embodiment of the present disclosure, the monitoring system includes an infrared monitoring device and a camera;

[0019] The infrared monitoring equipment is arranged in the sealed cabin;

[0020] The camera is fixedly arranged outside the sealed cabin.

[0021] In the laser processing simulation device for synchrotron radiation multi-technology combination provided by at least one embodiment of the present disclosure, the sealed cabin is provided with a vent, an X-ray observation window, a glove interface, a laser incident window and a monitoring observation window;

[0022] The vent is connected to a protective gas tank so that the protective gas can enter the sealed cabin;

[0023] The X-ray observation windows have at least two and both can be penetrated by X-rays, and one of the X-ray exit windows has a large enough opening to allow X-rays with different scattering angles to pass through, so as to ensure that the synchrotron radiation X-ray device can simultaneously collect multiple signals such as diffraction and imaging;

[0024] The glove interface is used to add operating gloves, and adopts the form of a glove box, so that the workpiece can be manually fine-tuned while the sealed cabin is sealed;

[0025] The laser incident window is used for allowing the laser adjusted by the galvanometer system to pass through.

[0026] In the laser processing simulation device applicable to the combination of multiple technologies of synchrotron radiation provided by at least one embodiment of the present disclosure, the galvanometer system includes a galvanometer and a field mirror;

[0027] The galvanometer is composed of a reflector and a driving mechanism;

[0028] The driving mechanism is composed of a servo motor and a position sensor;

[0029] The galvanometer is used to control the laser scanning direction;

[0030] The driving mechanism is fixedly connected to the reflector, and the driving mechanism is used to drive the reflector to rotate and / or extend to change the optical path;

[0031] The field lens is used to focus the laser spot and adjust the focal length of the laser spot.

[0032] In the laser processing simulation device applicable to the combination of synchrotron radiation and multiple technologies provided in at least one embodiment of the present disclosure, an XYZ motion platform is fixedly arranged in the sealed cabin;

[0033] The sample stage is configured to be fixedly connected to the XYZ motion platform, and the XYZ motion platform is used to drive the sample stage to move.

[0034] In the laser processing simulation device suitable for the combined use of multiple technologies using synchrotron radiation provided in at least one embodiment of the present disclosure, two of each of the driving mechanism and the reflecting mirror are configured.

[0035] In the laser processing simulation device suitable for the combined use of multiple technologies using synchrotron radiation provided by at least one embodiment of the present disclosure, the first lifting assembly and the sealed cabin are both fixedly connected to the second lifting assembly.

[0036] The beneficial effects of the present invention are as follows: a closed space is created by a sealed cabin to meet the requirements of a dust-free and oxygen-free environment, and a protective atmosphere environment can be constructed; by configuring a monitoring system, the real-time temperature of the molten pool and the real-time processing conditions in the sealed cabin can be obtained in real time while the laser forming process is being carried out; by being used in conjunction with a synchrotron radiation X-ray device, the diffraction patterns and microscopic images of the substrate and metal powder can be observed and recorded in real time, thereby revealing the inherent mechanism of the laser forming process by real-time monitoring of the melting and solidification processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 The present invention is a partial structural schematic diagram of a laser processing simulation device suitable for the combined use of multiple technologies using synchrotron radiation.

[0039] Figure 2 Schematic diagram of the distribution of monitoring observation windows and cameras.

[0040] Figure 3 Schematic diagram of the distribution of reflectors, field mirrors, and drive mechanisms.

[0041] Figure 4 Schematic diagram of the assembly of the XYZ motion platform and the sample stage.

[0042] In the figure:

[0043] 10. Galvanometer system; 11. Field mirror; 12. Reflector; 13. Driving mechanism;

[0044] 20. Sealed cabin; 21. Sample stage; 22. Monitoring observation window; 23. XYZ motion platform; 24. Glove interface;

[0045] 30. A first lifting assembly;

[0046] 40. A second lifting assembly;

[0047] 50. Camera;

[0048] 60. Control system. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only a part of the embodiments, rather than all the embodiments.

[0050] This embodiment proposes a laser processing simulation device suitable for the combined use of synchrotron radiation multiple technologies, which creates a closed space through a sealed cabin and an observation window, and uses a forward sealed cabin filled with protective gas to achieve an oxygen-free and dust-free environment. During laser processing, the observation window on the sealed cabin can be observed through the incidence, emission and camera of synchrotron radiation high-energy X-rays, and the molten pool morphology change process, phase reaction process and solidification defect generation process are recorded during the laser forming process, thereby revealing the processing mechanism, providing support for optimizing the processing technology, and finally obtaining optimized processing parameters to meet industrial needs.

[0051] like Figures 1 to 4 As shown, this embodiment provides a laser processing process simulation device suitable for the combined use of multiple technologies of synchrotron radiation, including: a laser (not shown), a galvanometer system 10, a sealed cabin 20, a first lifting assembly 30, a second lifting assembly 40, a control system 60 and a monitoring system.

[0052] Specifically, the laser is used to provide laser light for the galvanometer system 10. The first lifting assembly 30 is used to adjust the height of the galvanometer system 10.

[0053] Specifically, a sample stage 21 is disposed in the sealed cabin 20. The second lifting assembly 40 is used to adjust the height of the sealed cabin 20. The sample stage 21 is used to place the sample to be processed. The sealed cabin 20 is used to create a closed space so that the sample to be processed is isolated from the air. The sealed cabin 20 is located below the galvanometer system 10, and the galvanometer system 10 is used to adjust the spot size and focal length of the laser, and to make the laser act on the sample to be processed placed on the sample stage 21 for scanning processing.

[0054] Specifically, the samples to be processed are metal substrates and metal powders.

[0055] Specifically, the monitoring system is used to obtain the real-time temperature of the molten pool and the real-time processing conditions in the sealed cabin.

[0056] Specifically, the workbench, the first lifting assembly 30, the second lifting assembly 40 and the monitoring system are all electrically connected to the control system.

[0057] In this embodiment, the monitoring system includes an infrared monitoring device (not shown) and a camera 50 .

[0058] Specifically, the infrared monitoring device is arranged in the sealed cabin 20, and the infrared monitoring device adopts an infrared temperature measuring probe.

[0059] Specifically, the camera 50 is fixedly disposed outside the sealed cabin 20 .

[0060] In this embodiment, the sealed cabin 20 is provided with two ventilation ports (not shown), an X-ray observation window (not shown), a laser incident window (not shown) and a monitoring observation window 22 .

[0061] Specifically, two vents are respectively provided on two opposite side walls of the sealed cabin, one of which is an air inlet 25, which is connected to a protective gas tank (not shown) by a pipeline, and the other is an air outlet, which can be opened and closed. The protective gas enters the sealed cabin 20 from the air inlet through the air pipe, and the air is discharged from the air outlet. When the air in the sealed cabin is completely discharged and replaced by the protective gas, the air inlet and the air outlet are closed, thereby isolating the external air, achieving an oxygen-free and dust-free effect, forming a protective atmosphere environment, and preventing the workpiece from being oxidized or reacting with other gas elements during the processing.

[0062] In this embodiment, there are two X-ray observation windows, both of which can be penetrated by X-rays; specifically, the X-ray observation window is divided into a first observation window and a second observation window.

[0063] When used in conjunction with a synchrotron radiation device, the synchrotron radiation X-rays generated by the synchrotron radiation device enter the sealed cabin 20 through the first observation window and irradiate the metal substrate and metal powder, and then are emitted through the second observation window to the X-ray diffraction detector and the X-ray imaging detector. The X-ray diffraction detector records the phase changes of the metal base and the metal powder during the laser forming process, and the X-ray imaging detector records the microscopic morphology and defect formation process during the laser forming process. The infrared monitoring equipment measures the temperature of the metal substrate and the metal powder in real time, and records the temperature changes during the laser forming process. The camera 50 photographs the metal substrate and the metal powder inside the sealed cabin 20 through the monitoring observation window 22.

[0064] It is easier to understand that if only X-ray diffraction signals or X-ray imaging signals are collected, it is only necessary to inject X-rays from the first observation window and collect corresponding data at the second observation window.

[0065] In this embodiment, the glove interface is used to add operating gloves to form a glove box with the sealed cabin, so that the operator can manually fine-tune the workpiece while the sealed cabin is sealed;

[0066] In this embodiment, the laser incident window is used to allow the laser regulated by the galvanometer system 10 to pass through. After passing through, the laser acts on the metal substrate and the metal powder, thereby completing the laser forming process.

[0067] In this embodiment, the galvanometer system 10 includes a field mirror 11 , a reflector 12 and a driving mechanism 13 .

[0068] Specifically, the reflection mirror 12 is used to reflect the laser beam to the field lens 11 .

[0069] Specifically, the driving mechanism 13 is fixedly connected to the reflector 12, and the driving mechanism 13 is used to drive the reflector 12 to rotate and extend, thereby changing the optical path. Two driving mechanisms 13 and two reflectors 12 are configured.

[0070] Exemplarily, the driving mechanism 13 includes an electric telescopic rod (not shown), a servo motor (not shown) and a position sensor, the servo motor is configured to be fixedly connected to the movable end of the electric telescopic rod, and the output shaft of the motor is configured to be fixedly connected to the reflector 12.

[0071] When in use, after the laser beam enters the galvanometer system 10, it is first reflected by the two reflectors 12. Both reflectors can be rotated and retracted by the driving mechanism 13, thereby changing the optical path. The laser beam is reflected by the two reflectors 12 to the field lens 11 and then emitted. By replacing the field lens 11 and adjusting the distance between the field lens and the reflector 12, different focal lengths and different spot size effects can be achieved.

[0072] In this embodiment, an XYZ motion platform 23 is fixedly arranged in the sealed cabin 20; the sample stage 21 is configured to be fixedly connected to the XYZ motion platform 23, and the XYZ motion platform 23 is used to drive the displacement of the sample stage 21. The XYZ motion platform 23 is electrically connected to the control system, and the XYZ motion platform 23 is controlled by the control system.

[0073] Specifically, the XYZ motion platform 23 is fixed to the inner bottom surface of the sealed cabin 20 by bolts, and the sample stage is connected to the XYZ motion platform by an insertion structure. The XYZ motion platform 23 can drive the sample stage to move along the X-axis direction, the Y-axis direction and the Z-axis direction.

[0074] In this embodiment, the first lifting assembly 30 and the sealed cabin 20 are both fixedly connected to the second lifting assembly 40 .

[0075] In some embodiments not shown, the laser processing simulation device suitable for the combination of synchrotron radiation multiple technologies also includes a cooling system for dissipating heat from the laser.

[0076] Exemplarily, the cooling system includes a water chiller (not shown), a water inlet pipe (not shown), a water outlet pipe (not shown) and a water cooling head (not shown), one end of the water inlet pipe and the water outlet pipe are respectively connected to the water inlet and water outlet of the water chiller, the other end of the water inlet pipe and the water outlet pipe are respectively connected to the water outlet and water inlet of the water cooling head, and the water cooling head is connected to the laser.

[0077] In some embodiments not shown, the laser processing simulation device suitable for synchrotron radiation multi-technology combination also includes a cooling system, which is used to dissipate heat from the galvanometer system 10 to reduce the impact of high temperature on the galvanometer system.

[0078] Exemplarily, the cooling system includes a water chiller, a water inlet pipe, a water outlet pipe and a water cooling head. One end of the water inlet pipe and the water outlet pipe are respectively connected to the water inlet and water outlet of the water chiller, and the other end of the water inlet pipe and the water outlet pipe are respectively connected to the water outlet and water inlet of the water cooling head. The water cooling head is placed in the galvanometer system.

[0079] The working process of the laser processing simulation device suitable for the combination of synchrotron radiation multiple technologies in the embodiment will be disclosed below to further illustrate its principle.

[0080] S1, placing the metal substrate flat on the sample table, and spreading metal powder on the surface of the metal substrate, so that the metal substrate and the metal powder are in a closed space;

[0081] S2, connect the sealed cabin to the protective gas tank;

[0082] S3, allowing the protective gas to enter the sealed cabin through the vent, so that the sealed cabin is filled with the protective gas;

[0083] S4, adjust the galvanometer system, adjust the laser spot diameter and focal length, and ensure that the laser can pass through the laser incident window on the top of the sealed cabin and be incident on the sample;

[0084] S5, adjusting the first lifting assembly, the second lifting assembly and the XYZ motion platform so that the first observation window faces the incident direction of the synchrotron radiation X-ray, so that the molten pool overlaps with the synchrotron radiation X-ray spot, so that the second observation window faces the X-ray diffraction, imaging and other detectors, and adjusting the camera so that the camera is aimed at the third observation window;

[0085] S6, start the synchrotron radiation X-ray generator, X-ray diffraction detector, X-ray imaging detector, camera and infrared monitoring equipment to start collecting relevant data;

[0086] S7, starting the laser, the galvanometer system, the control system, and the cooling system to perform laser forming processing on the metal substrate;

[0087] S8, after the experiment, turn off the laser, stop the X-ray generator, X-ray diffraction detector, X-ray imaging detector and infrared monitoring equipment to collect data, and open the vent to ensure that the internal and external pressure difference remains consistent.

[0088] Although the embodiments of the present application have been shown and described above, the scope of protection of the present invention is not limited thereto, and any changes or substitutions that are not conceivable through creative work should be included in the scope of protection of the present invention; unless explicitly stated, any elements, actions or instructions used in this document should not be interpreted as critical or necessary.

Claims

1. A laser processing simulation device suitable for synchrotron radiation multi-technology combination, characterized in that: include: Laser, galvanometer system, sealed cabin, first lifting assembly, second lifting assembly, control system and monitoring system; The laser is used to provide laser light for the galvanometer system; The first lifting assembly is used to adjust the height of the galvanometer system; A sample stage is arranged in the sealed cabin; The second lifting assembly is used to adjust the height of the sealed cabin; The sample stage is used to place the sample to be processed; The sealed cabin is used to create a closed space to isolate the sample to be processed from the air or to protect the atmosphere; The sealed cabin is located below the galvanometer system, and the galvanometer system is used to adjust the spot size and focal length of the laser so that the laser acts on the sample to be processed placed on the sample stage; The monitoring system is used to obtain the real-time temperature of the molten pool and the real-time processing images in the sealed cabin; The workbench, the first lifting assembly, the second lifting assembly and the monitoring system are all electrically connected to the control system.

2. A laser processing simulation device suitable for synchrotron radiation multi-technology combination according to claim 1, characterized in that: Also includes: A cooling system is used to dissipate heat from the laser and / or galvanometer system.

3. The laser processing simulation device suitable for synchrotron radiation multi-technology combination according to claim 2, characterized in that: The monitoring system includes infrared monitoring equipment and cameras; The infrared monitoring equipment is arranged in the sealed cabin; The camera is fixedly arranged outside the sealed cabin.

4. The laser processing simulation device suitable for synchrotron radiation multi-technology combination according to claim 3, characterized in that: The sealed cabin is provided with a vent, an X-ray observation window, a glove interface, a laser incident window and a monitoring observation window; The vent is connected to a protective gas tank so that the protective gas can enter the sealed cabin; The X-ray observation windows have at least two and both can be penetrated by X-rays, and at least one of the X-ray exit windows has a sufficiently large opening to allow X-rays with different scattering angles to pass through, so as to ensure that the synchrotron radiation X-ray device simultaneously collects multiple signals such as diffraction and imaging; The laser incident window is used for allowing the laser adjusted by the galvanometer system to pass through.

5. The laser processing simulation device suitable for synchrotron radiation multi-technology combination according to claim 4, characterized in that: The galvanometer system includes a galvanometer and a field lens; The galvanometer is composed of a reflector and a driving mechanism; The driving mechanism is composed of a servo motor and a position sensor; The galvanometer is used to control the laser scanning direction; The driving mechanism is fixedly connected to the reflector, and the driving mechanism is used to drive the reflector to rotate and / or extend to change the optical path; The field lens is used to focus the laser spot and adjust the focal length of the laser spot.

6. The laser processing simulation device suitable for synchrotron radiation multi-technology combination according to claim 4, characterized in that: An XYZ motion platform is fixedly arranged in the sealed cabin; The sample stage is configured to be detachably connected to the XYZ motion platform, and the XYZ motion platform is used to drive the sample stage to move.

7. The laser processing simulation device suitable for synchrotron radiation multi-technology combination according to claim 5, characterized in that: The driving mechanism and the reflecting mirror are both configured in pairs.

8. The laser processing simulation device suitable for synchrotron radiation multi-technology combination according to claim 1, characterized in that: The first lifting assembly and the sealed cabin are both fixedly connected to the second lifting assembly.

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