Dual laser coaxial selective melting repair apparatus and method

Abstract

The application discloses a kind of dual laser coaxial selective melting repair equipment and method, the equipment includes: host computer and with the multi-dimension adjustment and powder laying module of host computer electrical connection, visual detection module, laser scanning module, light source module;Multi-dimension adjustment and powder laying module, including repair platform, clamping fixture, powder laying device, height adjustment device;Visual detection module is used to detect respectively to the surface of the part to be repaired, powder laying state, repair result, and detection data is transmitted back to host computer;Light source module includes first laser source, second laser source, reflector, and the laser emitted by first laser source is converged coaxially with the laser emitted by second laser source through reflector;Laser scanning module is used to adjust the scanning path of coaxial double laser beams, and the powder laying area of the repair area is scanned and melted to repair processing.The application adopts laser selective melting technology, realizes the shape and property control of repair area, with high precision and good forming structure performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser repair, in particular to a double laser coaxial selective melting repair device and method. BACKGROUND

[0002] The traditional laser cladding repair technology is realized by laser melting the blown powder or transported wire, and the repaired structure still has problems such as poor precision, the need for a large amount of post-processing, and the inability to repair complex structures. Due to the limitations of positioning and powder laying, it is difficult to achieve shape and property control in the repair area when solving technical problems such as large size deviation of the repaired structure, grain coarsening, defect rate exceeding the standard, static load strength decrease, and unstable fatigue performance. SUMMARY

[0003] The purpose of the present application is to provide a double laser coaxial selective melting repair device and method, which uses laser selective melting technology to achieve shape and property control in the repair area, has higher precision in additive manufacturing, better performance of the formed structure, and meets more complex structure manufacturing.

[0004] To achieve the above purpose, the present application provides the following scheme:

[0005] A double laser coaxial selective melting repair device, comprising: an upper computer and a multi-dimensional adjustment and powder laying module, a visual detection module, a laser scanning module, and a light source module electrically connected to the upper computer;

[0006] The multi-dimensional adjustment and powder laying module comprises a repair platform, a clamping and fixing device, a powder laying device, and an adjusting device. The clamping and fixing device is used to clamp and fix the repaired part on the repair platform. The powder laying device is used to lay powder on the repaired area of the repaired part under the control of the upper computer. The adjusting device is used to adjust the height of the repair platform under the control of the upper computer.

[0007] The visual detection module is used to detect the surface of the repaired part and transmit the contour data of the repaired area back to the upper computer. It is used to detect the powder laying state after each powder laying and transmit the detection data back to the upper computer. It is used to detect the repair result after each laser melting repair and transmit the detection data back to the upper computer.

[0008] The light source module comprises a first laser source, a second laser source, and a reflector. The laser emitted by the first laser source is coaxial with the laser emitted by the second laser source through the reflector, and emits a coaxial double laser beam to the laser scanning module.

[0009] The laser scanning module is used to adjust the scanning path of the coaxial double laser beam under the control of the upper computer, and scan and melt the powder laying area of the repaired area for repair processing.

[0010] Further, the multi-dimension adjustment and powder laying module further comprises a repair cavity, the repair platform, the clamping and fixing device, the powder laying device and the height adjusting device are arranged in the repair cavity, a laser scanning hole and a visual detection hole are arranged above the repair cavity, the laser scanning module is arranged above the laser scanning hole, and the visual detection module is arranged above the visual detection hole.

[0011] Further, the visual detection module comprises at least two CCD cameras.

[0012] Further, the laser scanning module comprises a laser galvanometer.

[0013] Further, the first laser source comprises an 880nm semiconductor laser and a first beam expander, the first beam expander expands the radius of 880nm laser emitted by the 880nm semiconductor laser to a first radius, the second laser source comprises a 1080nm semiconductor laser and a second beam expander, the second beam expander expands the radius of 1080nm laser emitted by the 1080nm semiconductor laser to a second radius, the first radius is greater than the second radius, and the 880nm laser wraps the 1080nm laser; two reflectors are arranged, which are a first reflector and a second reflector, the first reflector corresponds to the first beam expander, reflects the 1080nm laser to the second reflector, and the second reflector is a single-surface reflector, coaxially converges the 1080nm laser and the 880nm laser together, and emits to the laser scanning module.

[0014] The application further provides a double-laser coaxial selective melting repair method applied to the double-laser coaxial selective melting repair device.

[0015] S1, clamping and fixing the part to be repaired on the repair platform of the multi-dimension adjustment and powder laying module;

[0016] S2, the visual detection module detects the surface of the part to be repaired and transmits the detection data back to the upper computer;

[0017] S3, the upper computer analyzes the detection data in S2, if the clamping and fixing state is detected to be incorrect, the fixing state needs to be adjusted again, if not, based on the detection data, a powder laying scheme is determined, a powder laying control instruction is generated, and the powder laying control instruction is transmitted to the multi-dimension adjustment and powder laying module;

[0018] S4, after receiving the powder laying control instruction of the upper computer, the multi-dimension adjustment and powder laying module performs powder laying work on the part to be repaired on the repair platform according to the powder laying control instruction;

[0019] S5, after each powder laying, the visual detection module detects the powder laying state and transmits the detection data back to the upper computer;

[0020] S6, the upper computer analyzes the detection data in S5, determines the laser melting repair scheme, generates the laser melting repair control instruction, and transmits it to the laser scanning module;

[0021] S7, after receiving the laser melting repair control instruction from the upper computer, the laser scanning module adjusts the scanning path of the coaxial double laser beams and performs scanning and melting repair processing on the powder laying area of the to-be-repaired area;

[0022] S8, the visual detection module detects the melting repair result of the to-be-repaired part and transmits the detection data back to the upper computer;

[0023] S9, the upper computer analyzes the detection data in S8, adjusts the powder laying scheme, determines a new powder laying control instruction, and transmits it to the multi-dimensional adjustment and powder laying module;

[0024] S10, repeat S4 to S9 until the entire to-be-repaired part is completely repaired.

[0025] Further, in step S6, the laser melting repair scheme is determined, and the laser melting repair control instruction is generated, which needs to meet the following conditions:

[0026] The to-be-repaired area of the to-be-repaired part coincides with the laser scanning area;

[0027] The plane where the to-be-repaired area of the to-be-repaired part is located is parallel to the powder coating plane and the laser scanning plane.

[0028] According to the specific embodiments provided by the application, the following technical effects are disclosed: the double laser coaxial selective melting repair equipment and method provided by the application can perform visual detection on the to-be-repaired part through the visual detection module, make a high-precision and high-efficiency repair scheme according to the damage condition, perform visual detection after each powder laying and melting repair, and adjust in real time according to different repair states, thereby improving the repair precision and efficiency; the new coaxial double laser beams are adopted, and the traditional single laser beam preheating and heat preservation process before work is omitted, so that the repair process is more simple. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 It is a structural schematic diagram of the double laser coaxial selective melting repair equipment of the application;

[0031] Figure 2 It is a structural schematic diagram of the double laser coaxial beam of the application;

[0032] Figure 3 It is a structural schematic diagram of the multi-dimensional adjustment and powder laying module of the embodiment of the application;

[0033] The reference signs are explained as follows: 1, first laser source; 2, second laser source; 3, first reflecting mirror; 4, second reflecting mirror; 5, laser galvanometer; 6, repair cavity; 7, height adjusting device; 7-1, fixed plate; 7-2, first lead screw; 8, powder laying device; 8-1, powder laying vehicle; 8-2, second lead screw; 9, CCD camera; 10, upper computer; 11, repair platform; 12, bench clamp; 13, part to be repaired. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0035] The purpose of the application is to provide a double laser coaxial selective melting repair equipment and method, which adopts laser selective melting technology to realize shape and property control of the repair area, has higher precision in additive manufacturing, has better structure performance, and meets more complex structure manufacturing.

[0036] In order to make the above-mentioned purposes, characteristics and advantages of the application more obvious and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0037] As shown in Figure 1 and Figure 3 The double laser coaxial selective melting repair equipment provided by the application includes an upper computer 10 and a multi-dimensional adjustment and powder laying module, a visual detection module, a laser scanning module and a light source module electrically connected with the upper computer 10.

[0038] The multi-dimensional adjustment and powder laying module includes a repair platform 11, a clamping and fixing device, a powder laying device 8 and a height adjusting device 7. The clamping and fixing device is used for clamping and fixing the part to be repaired on the repair platform. The powder laying device 8 is used for laying powder on the repair area of the part to be repaired 13 under the control of the upper computer 10. The height adjusting device 8 is used for adjusting the height of the repair platform 11 under the control of the upper computer 10, so as to meet the repair requirements.

[0039] For example, the clamping fixture can be a bench vice 12, the height adjustment device 7 includes a fixed plate 7-1, a first lead screw 7-2, the repair platform 11 is connected to the fixed plate 7-1 through the first lead screw 7-2, the repair platform 11 is slidingly connected to the first lead screw 7-2 through a sliding block, the first lead screw 7-2 can drive the repair platform 11 to move up and down, the first lead screw 7-2 is driven by a first motor, the upper computer 10 is electrically connected with the first motor, under the control of the upper computer 10, the first motor drives the first lead screw 7-2, and the repair platform 11 and the repaired part 13 thereon move up and down.

[0040] For example, the powder laying device 8 is arranged above the clamping fixture, and specifically can include a second lead screw 8-2 and a third lead screw perpendicular to each other in a horizontal plane, the third lead screw is slidingly connected to the second lead screw 8-2 through a sliding block, the third lead screw is connected to a powder laying vehicle 8-1 through a sliding block, the second lead screw 8-2 is driven by a second motor, and the third lead screw is driven by a third motor, and the second motor and the third motor are electrically connected with the upper computer 10.

[0041] For example, the first lead screw is in the z-axis direction, the second lead screw is in the x-axis direction, and the third lead screw is in the y-axis direction. The xy-axis moving structure formed by the second lead screw and the third lead screw can refer to the common structure in the prior art.

[0042] Under the control of the upper computer 10, the second motor drives the second lead screw, and the third lead screw and the powder laying vehicle thereon move together along the x-axis direction to a set position, the third motor can be started to drive the third lead screw to move the powder laying vehicle along the y-axis direction; so as to realize the movement of the powder laying vehicle in the front, back, left and right directions, and accurately lay powder on the repaired area of the repaired part 13.

[0043] During the repair process, after each layer is repaired, the repair platform 11 moves downward by a certain distance, and then the powder is laid, melted and sintered, and the repair is layer by layer until completion.

[0044] The visual detection module is used for detecting the surface of the repaired part, and transmitting the contour data of the repaired area back to the upper computer 10; is used for detecting the powder laying state after each time of powder laying, and transmitting the detection data back to the upper computer 10; is used for detecting the repair result after each time of laser melting repair, and transmitting the detection data back to the upper computer 10;

[0045] The light source module includes a first laser source 1, a second laser source 2 and a reflector, the laser emitted by the first laser source 1 is coaxial with the laser emitted by the second laser source 2 through the reflector, and emits a coaxial double laser beam to the laser scanning module;

[0046] The laser scanning module is used for adjusting the scanning path of the coaxial double laser beams under the control of the host computer 10, and scanning and melting repair processing is performed on the powder laying area of the area to be repaired.

[0047] The host computer 10 has two main functions, one is to receive the detection of the visual detection module on the clamping and fixing state, the powder laying state and the laser melting repair state of the part to be repaired, and make corresponding data adjustment, and the other is to transmit the adjusted data to the visual detection module and the laser scanning module respectively, so as to control the working effect.

[0048] The multi-dimensional adjustment and powder laying module further comprises a repair cavity 6, the repair platform 11, the clamping and fixing device, the powder laying device 8 and the height adjusting device 7 are arranged in the repair cavity 6, and a laser scanning hole and a visual detection hole are formed in the upper portion of the repair cavity 6, the laser scanning module is arranged above the laser scanning hole, and the visual detection module is arranged above the visual detection hole.

[0049] Specifically, the visual detection module adopts at least two CCD cameras 9, and the laser scanning module adopts a laser galvanometer 5.

[0050] The light source module is different from the single laser light source used in the traditional melting repair technology, and the double laser coaxial emission is adopted in the present application. Figure 2 As shown in the figure.

[0051] The reflector is provided with two first reflectors 3 and second reflectors 4, the first reflector 3 corresponds to the first beam expander, reflects the 1080nm laser to the second reflector 4, the second reflector 4 is a single-sided reflector, corresponds to the second beam expander, and converges the 1080nm laser and the 880nm laser coaxially together, and emits to the laser scanning module.

[0052] The two laser beams are emitted by the respective semiconductor lasers, and after passing through the respective beam expanders, the 808nm laser is expanded into a larger radius laser beam, and the 1080nm laser is expanded into a smaller radius laser beam. After the cooperation of the first reflector and the one-way reflector, the two laser beams reach the coaxial state. The laser cooperation state is as shown in the figure. Figure 2The light source module has the following effects: the short-wavelength laser wrapped outside has a low amount, can preheat the powder before sintering, and the preheating treatment of the powder before sintering is omitted; the long-wavelength laser wrapped inside has a higher energy, and can play a sintering role. After sintering is completed, the short-wavelength laser wrapped outside can re-scan the area just sintered, play a heat preservation process for the area, reduce the phenomenon that the powder particles are disordered due to sudden cooling, and improve the sintering precision.

[0053] The application further provides a double laser coaxial selective melting repair method applied to the double laser coaxial selective melting repair device.

[0054] S1, clamping and fixing the part to be repaired on the repair platform of the multi-dimensional adjustment and powder laying module;

[0055] S2, the visual detection module detects the surface of the part to be repaired and transmits the detection data back to the upper computer;

[0056] S3, the upper computer analyzes the detection data in S2, if the clamping and fixing state is incorrect, the fixing state needs to be adjusted again, if not, based on the detection data, a powder laying scheme is determined, a powder laying control instruction is generated, and is transmitted to the multi-dimensional adjustment and powder laying module;

[0057] S4, after receiving the powder laying control instruction of the upper computer, the multi-dimensional adjustment and powder laying module carries out powder laying work on the part to be repaired on the repair platform according to the powder laying control instruction;

[0058] S5, after each time of powder laying, the visual detection module detects the powder laying state and transmits the detection data back to the upper computer;

[0059] S6, the upper computer analyzes the detection data in S5, determines a laser melting repair scheme, generates a laser melting repair control instruction, and transmits the laser melting repair control instruction to the laser scanning module;

[0060] S7, after receiving the laser melting repair control instruction of the upper computer, the laser scanning module adjusts the scanning path of the coaxial double laser beams, and carries out scanning and melting repair treatment on the powder laying area of the part to be repaired;

[0061] S8, the visual detection module detects the melting repair result of the part to be repaired and transmits the detection data back to the upper computer;

[0062] S9, the upper computer analyzes the detection data in S8, adjusts the powder laying scheme, determines a new powder laying control instruction, and transmits the new powder laying control instruction to the multi-dimensional adjustment and powder laying module;

[0063] S10, repeating S4 to S9 until the entire repair part is repaired.

[0064] In the step S6, the laser melting repair scheme is determined, and the laser melting repair control instruction is generated, which needs to meet the following conditions:

[0065] The repair area of the repair part coincides with the laser scanning area;

[0066] The plane where the repair area of the repair part is located is parallel to the powder scraping plane and the laser scanning plane.

[0067] In addition, the position and angle tolerance error is small, and high-precision forming can be realized.

[0068] The double laser coaxial selective melting repair equipment and method provided by the application has the following characteristics:

[0069] 1. High repair precision: the visual detection module is used to accurately position the repair area, and different repair methods are used for different damage conditions.

[0070] 2. Fast repair efficiency: accurate visual detection and laser scanning can greatly improve the repair precision and efficiency.

[0071] 3. Good repair effect: each powder laying and melting repair is followed by a detection step to control the repair state in real time.

[0072] 4. Simple repair process: compared with a single laser beam, the coaxial double laser beam melting repair eliminates the preheating of the powder laying platform before repair and the heat preservation process after repair, making the repair process more simple.

[0073] In this paper, specific examples are applied to explain the principles and implementation modes of the application, and the above examples are only used to help understand the method and core idea of the application; at the same time, for those skilled in the art, according to the idea of the application, the specific implementation mode and application range will be changed. Therefore, the content of the specification should not be understood as a limitation of the application.

Claims

1. A dual laser coaxial selective area melting repair apparatus, characterized in that, The application relates to a multi-dimension adjusting and powder laying module, a visual detection module, a laser scanning module and a light source module. The multi-dimension adjusting and powder laying module comprises a repairing platform, a clamping fixing device, a powder laying device and an adjusting device. The clamping fixing device is used for clamping and fixing a part to be repaired on the repairing platform, the powder laying device is used for laying powder on a repairing area of the part to be repaired under the control of the host computer, and the adjusting device is used for adjusting the height of the repairing platform under the control of the host computer. The clamping fixing device adopts a bench vice, the adjusting device comprises a fixed plate and a first lead screw, the repairing platform is connected to the fixed plate through the first lead screw, the repairing platform is slidably connected to the first lead screw through a sliding block, the first lead screw drives the repairing platform to move up and down, the first lead screw is driven by a first motor, the host computer is electrically connected with the first motor, the first motor drives the first lead screw under the control of the host computer, and the repairing platform and the part to be repaired thereon are driven to move up and down. The powder laying device is arranged above the clamping fixing device and comprises a second lead screw and a third lead screw which are perpendicular to each other in a horizontal plane, the third lead screw is slidably connected to the second lead screw through a sliding block, the third lead screw is connected to a powder laying vehicle through a sliding block, the second lead screw is driven by a second motor, the third lead screw is driven by a third motor, and the second motor and the third motor are electrically connected with the host computer; the first lead screw is in the z-axis direction, the second lead screw is in the x-axis direction, and the third lead screw is in the y-axis direction; under the control of the host computer, the second motor drives the second lead screw to move along the x-axis direction together with the third lead screw and the powder laying vehicle thereon, reaches a set position, the third motor is started to drive the third lead screw to move along the y-axis direction, and the powder laying vehicle is moved in the front-back and left-right directions to lay powder on the repairing area of the part to be repaired. During the repairing process, the repairing platform is moved downwards by a certain distance after each layer is repaired, then powder is laid, melted and sintered, and the repairing is layer by layer until the repairing is completed. The visual detection module is used for detecting the surface of the part to be repaired, transmitting the profile data of the repairing area to the host computer, detecting the powder laying state after each time of powder laying, transmitting the detection data to the host computer, detecting the repairing result after each time of laser melting and repairing, and transmitting the detection data to the host computer. The light source module comprises a first laser source, a second laser source and a reflector, coaxial double laser beams are emitted from the first laser source and the second laser source through the reflector, and the coaxial double laser beams are emitted to the laser scanning module. The laser scanning module is used for adjusting the scanning path of the coaxial double laser beams under the control of the host computer, and scanning and melting and repairing the powder laying area of the repairing area. The first laser source comprises an 880nm semiconductor laser, a first beam expander mirror, the first beam expander mirror expands the radius of the 880nm laser emitted by the 880nm semiconductor laser to a first radius, the second laser source comprises a 1080nm semiconductor laser, a second beam expander mirror, the second beam expander mirror expands the radius of the 1080nm laser emitted by the 1080nm semiconductor laser to a second radius, the first radius is greater than the second radius, and the 880nm laser wraps the 1080nm laser; the mirror is provided with two, namely a first mirror and a second mirror, the first mirror corresponds to the first beam expander mirror, reflects the 880nm laser to the second mirror, and the second mirror is a single-surface mirror, coaxially converges the 1080nm laser and the 880nm laser together, and emits to the laser scanning module.

2. The dual laser coaxial selective melt repair apparatus of claim 1, wherein, The multi-dimensional adjustment and powder laying module further comprises a repair cavity, the repair platform, the clamping and fixing device, the powder laying device and the height adjusting device are arranged in the repair cavity, a laser scanning hole and a visual detection hole are formed in the upper portion of the repair cavity, the laser scanning module is arranged above the laser scanning hole, and the visual detection module is arranged above the visual detection hole.

3. The dual laser coaxial selective melt repair apparatus of claim 1, wherein, The visual detection module adopts at least two CCD cameras.

4. The dual laser coaxial selective melt repair apparatus of claim 1, wherein, The laser scanning module adopts a laser galvanometer.

5. A method for double laser coaxial selective melting repair, applied to the double laser coaxial selective melting repair device of any one of claims 1-4, characterized in that, The method comprises the following steps: S1, clamping and fixing the part to be repaired on the repair platform of the multi-dimensional adjustment and powder laying module; S2, the visual detection module detects the surface of the part to be repaired and transmits the detection data back to the upper computer; S3, the upper computer analyzes the detection data in S2, if the clamping and fixing state is detected to be incorrect, the fixing state needs to be adjusted again, if not, based on the detection data, a powder laying scheme is determined, a powder laying control instruction is generated, and is transmitted to the multi-dimensional adjustment and powder laying module; S4, after receiving the powder laying control instruction of the upper computer, the multi-dimensional adjustment and powder laying module carries out powder laying work on the part to be repaired on the repair platform according to the powder laying control instruction; S5, after each powder laying, the visual detection module detects the powder laying state and transmits the detection data back to the upper computer; S6, the upper computer analyzes the detection data in S5, determines a laser melting repair scheme, generates a laser melting repair control instruction, and transmits it to the laser scanning module; wherein, the determination of the laser melting repair scheme and the generation of the laser melting repair control instruction need to meet the following conditions: The part to be repaired region of the part to be repaired is coincident with the laser scanning region; The plane where the part to be repaired region of the part to be repaired is located is parallel to the powder scraping and coating plane and the laser scanning plane; S7, after receiving the laser melting repair control instruction of the upper computer, the laser scanning module adjusts the scanning path of the coaxial double laser beams and carries out scanning and melting repair processing on the powder laying region of the part to be repaired region; S8, the visual detection module detects the melting repair result of the part to be repaired and transmits the detection data back to the upper computer; S9, the upper computer analyzes the detection data in S8, adjusts the powder laying scheme, determines a new powder laying control instruction, and transmits it to the multi-dimensional adjustment and powder laying module; S10, repeating S4 to S9 until the entire part to be repaired is repaired completely.

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