Method for enhancing 3D printing strength through laser energy

Abstract

The invention discloses a method for enhancing 3D printing strength by using laser, which realizes laser enhancement treatment in a material printing process and prints a multi-layer structure with excellent mechanical properties by controlling a material extrusion system and a laser control system and adjusting the relative distance and angle between a laser and a nozzle in the printing process. Through treatment of a laser device on contact surfaces between wires and between layers, the viscosity and strength between printing layers are enhanced, the strength of multi-layer printing is guaranteed, and the direct bonding force of materials in each layer is increased; the control system regulates and controls the semiconductor laser module to change laser power, and good printing performance is guaranteed. According to the method, the printing strength of the multi-layer complex three-dimensional space structure can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing and laser-enhanced manufacturing, and specifically relates to a method for enhancing 3D printing strength by utilizing laser energy. Background Art

[0002] Polymer 3D printing technology, which uses computer 3D models as "drawings" and uses biocompatible materials, can provide a new technical solution for the manufacture of multi-layer printed parts, especially the preparation and integrated forming of multi-layer space with high strength interlayer components. Polymer 3D printing technology has the advantages of customized production and the preparation of complex geometric structure objects, but polymer 3D printing technology still faces some problems.

[0003] Based on the existing 3D printing technology, polymer 3D printing technology still has defects and deficiencies in the manufacturing and integrated forming of multi-layer filaments and interlayer strength. For example, when manufacturing components with multi-layer complex spatial structures, it is difficult to achieve precise control of the viscosity of the material layers and print components with good interlayer matching. In particular, there is a lack of an efficient and fast integrated forming method for the high-strength and precise manufacturing of the interlayer structure of multi-layer materials. Moreover, since the first layer material and the second layer material need to maintain a high material viscosity during the printing process, the types of methods that can be selected to enhance the viscosity of the printed material layers are very limited, and the printing performance is poor compared with conventional printing materials. Therefore, low-viscosity matrix materials have serious flow and wetting characteristics at the beginning of printing, making it difficult to achieve precise geometric shape control and poor surface roughness, and the geometric shape accuracy and surface roughness of the molded parts are poor. Therefore, it is a recognized challenge to print low-viscosity materials in vitro and maintain interlayer strength during printing. Summary of the invention

[0004] In order to solve the problems in the prior art and equipment, the present invention provides a method for enhancing the strength of 3D printing by using laser energy, wherein the device configured by the method comprises: a frame (100), a laser system (200), an XYZ three-axis motion module (300), and a control system (400);

[0005] The laser system (200) is fixed on the frame (100) and connected to the control system (400). The steering gear motion control unit in the control system (400) supports the calculation of the G-code code path, and generates the corresponding motion G-code code for controlling the steering gear transmission according to the position difference calculation. The steering gear is used to control the rotation of the laser to realize the scanning of the laser on the front path and the scanning of the gap between layers; according to the G-code code generated by the slice, the semiconductor laser module is controlled to move, forming a fixed-point scanning to enhance its mechanical capacity;

[0006] The XYZ three-axis motion module (300) is installed on the frame (100) and connected to the control system (400), and is used to drive the X-axis, Y-axis, Z-axis, and laser system (200) to move;

[0007] The servo motion control unit in the control system (400) supports the calculation of the G-code code path, generates the corresponding servo rotation angle according to the p nozzle printing path, and realizes the rotation of the servo, thereby realizing the scanning of the front path and the scanning of the gaps between layers; according to the scanning result and the G-code code generation result, the laser system (200) is controlled to move, track and scan the interlayer structure at a fixed point to enhance the mechanical properties of the 3D printing interlayer;

[0008] Furthermore, the semiconductor laser (207) is supported and arranged around the nozzle (210), and can rotate clockwise or counterclockwise around the nozzle (210); the semiconductor laser (207) is arranged on the nozzle protection cover (206), and drives the driving gear (202) through the gear driving steering gear (203), thereby causing the semiconductor laser (207) to rotate clockwise or counterclockwise around the nozzle (210); at the same time, the semiconductor laser (207) is connected to the connecting rod driving steering gear (208) and the driving connecting rod (209), and drives the semiconductor laser (207) through the driving connecting rod (209). The angle of the laser (207) changes, and the angle change range is 0-45 degrees; the laser system (200) is connected to the motion control unit, the steering gear motion control unit and the laser control unit in the control system (400), and the relative position and angle between the semiconductor laser (207) and the nozzle (210) are adjusted by generating G-code code through slicing software, so that the semiconductor laser (207) performs laser solidification on the 3D printing path and the gap between layers; the maximum value of the laser power of the semiconductor laser (207) is less than the laser power value when the material reaches a completely molten state.

[0009] Furthermore, the 3D printing method of the device for achieving enhanced printing strength and multi-layer strength comprises the following steps: The control system (400) constructs a target model according to functional requirements and slices the target model layer by layer; the printing parameters include setting parameters of the temperature of the nozzle (210) in the laser system (200), feed speed control parameters and acceleration control parameters, temperature control parameters of the motion speed control parameters, XYZ three-axis motion control parameters, gear-driven steering gear (203), connecting rod-driven steering gear (208) transmission motion parameters, and semiconductor laser power parameters; The thickness between the nozzle (210) and the base plate in the laser system (200), the distance between the nozzle (210) and the semiconductor laser (207) in the laser system (200), and the angle between the semiconductor laser (207) and the Y axis in the laser system (200) are set, and the printing control program is started, and the operations of XYZ three-axis zeroing, base plate matching, etc. are respectively started to complete the printing position calibration, so as to ensure the printing quality in the whole printing process; the nozzle control unit in the control system (400) adjusts the total flow rate of the nozzle (210) and keeps the flow rate constant until the stable printing requirement is met, that is, the printing is uninterrupted and the thickness of the printed material is uniform, and according to the motion G-code code information in the control system (400), the parameters between the printing path and the semiconductor laser (207) are calculated and adjusted to control the motion path of the semiconductor laser (207) in real time; Start formal printing. During the printing process, the control system (400) converts the printing control program into G-code code to control the movement of each individual instrument unit, and controls the semiconductor laser (207) to melt the surface of the printing path. The laser control unit in the control system (400) adjusts the power of the semiconductor laser according to the motion G-code code information of the motion control unit until the printing is completed; After all layers of the target model are printed, the movement and power of the nozzle (210) and the semiconductor laser (207) are stopped, and a command is sent through the control system (400) to turn off the laser system (200) through the control command; and then a command is sent through the control system (400) to control the XYZ three-axis motion module (300) to return to the starting position; the printing material is withdrawn, and finally a multi-layer target printed model is obtained.

[0010] The beneficial effects of the above embodiments of the present invention are as follows: (1) One or more embodiments of the present invention can realize a method of printing a thermoplastic polymer material as the raw material, and using the material to perform multi-layer reinforced components based on laser, and can achieve high-strength manufacturing; the source of materials available for printing is wide, and the process stability and manufacturing consistency are high. (2) The 3D laser enhanced printer of the present invention adopts a path G-code system for path planning and calculation of printing status. The control system (400) changes the laser power through the calculated G-code to ensure the stability and consistency of printing, and has the advantages of high automation and integration. (3) The present invention adjusts the laser power during the printing process to achieve gap processing between lines and between layers, which can better improve the interlayer bonding strength of multi-layer printed structural components and improve the mechanical strength of interlayer components. (4) The present invention uses a multi-control unit to coordinately control the gear-driven servo (203), the semiconductor laser (207), the connecting rod-driven servo (208) and the nozzle (210), so that the relative movement of the semiconductor laser (207) and the nozzle (210) can be adjusted in real time during the printing process. After the printing is completed, the semiconductor laser (207) and the nozzle (210) can be automatically returned to the origin. The present invention has the advantages of high-precision multi-layer material integrated manufacturing and precise control, as well as the significant advantages of automation and integration. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. Figure 1 The present invention is a flow chart of a method for enhancing the strength of 3D printing by utilizing laser energy. Figure 2 It is a schematic diagram of an overall device that uses laser energy to achieve the strength of 3D printing of enhanced materials. Among them: 100 (frame), 200 (laser system), 300 (XYZ three-axis motion module), 400 (control system). Figure 3 The invention is a schematic diagram of the structure of a laser system (200), wherein: 201 (counterweight mounting frame), 202 (driving gear), 203 (gear-driven steering gear), 204 (rotating bearing), 205 (rotating bearing fixing seat), 206 (nozzle protection cover), 207 (semiconductor laser), 208 (connecting rod driving steering gear), 209 (driving connecting rod), and 210 (nozzle). Figure 4 It is a schematic diagram of the overall equipment line and line enhancement that uses laser energy to achieve 3D printing strength enhancement of enhanced materials. Figure 5 It is a schematic diagram of the overall device layer and interlayer enhancement using laser energy to achieve 3D printing strength enhancement of materials. DETAILED DESCRIPTION

[0011] The present invention is further elaborated and described below in conjunction with specific embodiments. The embodiments are only exemplary of the present disclosure and do not define the scope of limitation. The technical features of each embodiment of the present invention can be combined accordingly without conflicting with each other. It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof; for the convenience of description, if the words "upper", "lower", "left" and "right" appear in the present invention, it only means that it is consistent with the upper, lower, left and right directions of the drawings themselves, and does not limit the structure. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Terminology explanation section: The terms "install", "connected", "connect", "fixed" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a direct connection, or an indirect connection through an intermediate medium, it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0012] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an integrated forming and manufacturing technology that is particularly suitable for multi-layer reinforced complex spatial structures, which solves the problems of internal gaps, interlayer strength, etc. that occur in the printing process of multi-layer printed components, ensures the consistency of printing and precise and rapid forming, and at the same time expands the laser enhanced 3D printing technology in the field of fused filament manufacturing; improves the strength of multi-layer spatial printed structures; improves manufacturing efficiency and reduces manufacturing costs.

[0013] Embodiment 1:

[0014] The present embodiment provides a 3D printing method for enhancing material strength by using laser energy. The method adjusts the laser intensity and distance during the printing process by controlling the control system, the nozzle system, the steering gear transmission device, and the semiconductor laser to achieve processing of material printing and print out a structure with adjustable mechanical properties; by processing the surface of each layer by the laser, the viscosity and strength between the printed layers are changed, the strength of the multi-layer printing is ensured, and the fusion degree of each layer is increased; the 3D laser enhanced printer uses the path G-code code generated after slicing to monitor and calculate the printing state, and the control system (400) changes the laser power by the calculated G-code code parameters to ensure the stability and consistency of the printing, and has the advantages of high automation and integration. The present invention can achieve the increase of the printing strength and printing efficiency of multi-layer complex three-dimensional space structures.

[0015] The overall equipment schematic diagram of the 3D printing device is as follows Figure 1 As shown, the 3D printing device comprises: a frame (100), a laser system (200), an XYZ three-axis motion module (300), and a control system (400); a gear-driven steering engine (203) and a connecting rod-driven steering engine (208) in the laser system (200) are fixed on a nozzle protection cover (206), and the gear-driven steering engine (203) and the connecting rod-driven steering engine (208) are driven to move by the control system (400); a semiconductor laser (207) and a nozzle (210) are placed horizontally and in the same plane; and the material loaded in the nozzle (210) is extruded by controlling the control system (400).

[0016] In the present invention, if Figure 1 As shown, a schematic diagram of the overall equipment of the 3D printing device is presented, wherein the XYZ three-axis motion module (300) comprises an X-axis motion module, a Y-axis motion module, and a Z-axis motion module, and all three are connected to the control system (400); the Z-axis motion module is mounted on the frame (100) and connected to the control system (400), receives a signal from a motion control unit in the control system (400) to drive the X-axis motion module and the laser system (200) to move in the Z direction; the X-axis motion module is mounted on the frame (100) and connected to the control system (400), receives a signal from a motion control unit in the control system (400), and controls the X-axis movement of the laser system (200) in the horizontal direction; the Y-axis motion module is mounted on the frame (100) and connected to the control system (400), receives a signal from a motion control unit in the control system (400), and controls the Y-axis movement in the horizontal direction; the XYZ three-axis motion bracket adopts a gantry-type high-precision displacement workbench, which can be driven by a servo motor, a stepping motor or a linear motor.

[0017] In this embodiment, the working stroke of the XY axis motion platform is 0-220mm, the positioning accuracy is not less than ±12μm, the repeated positioning accuracy is not less than ±3mm, and the maximum speed is 600mm / s. The working stroke of the Z axis motion module is 0-250mm, the positioning accuracy is not less than ±12μm, the repeated positioning accuracy is not less than ±1μm, and the maximum speed is 300mm / s. Further, the Z axis motion module is installed at the bottom of the printing platform through a mold frame, and the printing platform is controlled to move along the Z axis direction through the motion module and the stepper motor. The printing platform is installed with a counterweight mounting frame (201), a driving gear (202), a gear-driven servo (203), a rotating bearing (204), a rotating bearing fixing seat (205), a nozzle protection cover (206), a semiconductor laser (207), a connecting rod driving servo (208), a driving connecting rod (209) and a nozzle (210).

[0018] The present invention is achieved through the following technical solutions: (1) A multi-device motion compensation control method is used to solve the delay problem that occurs when moving between multiple different devices. In the planning of the printing path, a method of fuse printing combined with laser enhancement is used to further optimize the wire diameter that needs to be enhanced and not melted on the printing path so that it matches the model file that needs to be printed. First, the control system (400) will optimize the model file, slice the optimized model, generate the original printing trajectory code, and generate the code corresponding to the relative trajectory movement in the control system (400). (2) By using laser enhancement to enhance the printing process in real time during the printing process, and adjusting the power of the semiconductor laser (207) according to the solidification quality of the material, better wire diameter and forming quality can be ensured, which can greatly reduce the adjustment of printing process parameters and ensure the stability and consistency of multiple printings. In addition, pre-curing each layer is conducive to improving the bonding strength between layers, ensuring that problems such as interlayer gaps, weak interlayer strength and poor printing accuracy that occur when forming large-sized structural parts are avoided.

[0019] Embodiment 2:

[0020] This embodiment provides a method for enhancing 3D printing strength by using laser energy, using the device for enhancing 3D printing strength by using laser energy as described in the first embodiment, such as Figure 1 As shown, the following steps are included: (1) Model setup. Determine the geometry of the printed part; (2) Model information processing. Determine the geometric information of each layer (path, layer thickness, etc.) and generate a printing data file; (3) Pre-printing processing, completing the preparation work before printing. The control system (400) controls the moving speed of each part, the nozzle extrusion speed, the printing speed, the base plate temperature, the nozzle temperature, the printing flow rate, etc.; (4) When printing begins, the semiconductor laser (207) and the nozzle (210) are started, and after the control system (400) analyzes the G-code, the control system (400) controls the movement of the semiconductor laser (207) and enhances the first layer and the inter-layer path. (5) After each layer is printed, the semiconductor laser (207) will enhance and fuse the printing area paths between layers, and the control system (400) can dynamically adjust the laser power. After the printing of the layer is completed, the laser system (200) will rise to a layer thickness and then print the next layer of the structure. Repeat the above process until all layers of the structure are printed.

[0021] In order to realize a method of enhancing the strength of 3D printing by using laser energy, the specific process steps are described:

[0022] Step 1: Print data file preparation.

[0023] The printing trajectory code is generated by importing into the control system (400) and slicing the STL model file.

[0024] Step 2: Print preprocessing. (2-1) Pre-printing height test, using the motion control system in the control system (400), automatically detects and records the distance between the semiconductor laser (207) and the nozzle (210) before printing, to prevent one of the semiconductor laser (207) and the nozzle (210) from hitting the bottom printing plate during movement. (2-2) Pre-extrusion test flow rate, automatically setting the printing nozzle and base plate temperature according to the control system (400); before printing, the control system (400) sends instructions to control the nozzle (210) to start working and evenly print the material; before printing starts, the control system (400) automatically calculates the distance between the semiconductor laser (207) and the nozzle (210), and controls the printing state of the nozzle (210) through the G-code code generated by the slicing system and controls and adjusts the nozzle (210) until a complete straight line is printed, that is, the current printing state is the best. (2-3) After testing the printing height and flow rate, the system automatically calculates the distance difference between the semiconductor laser (207) and the nozzle (210), and generates a trajectory code of the corresponding path in the control system (400). (2-4) Start printing.

[0025] Step 3: Single layer structure printing. (3-1) The G-code generated by the control system (400), and the pre-set extrusion flow rate, number of printing layers, semiconductor laser (207) power and printing start. (3-2) When printing starts, the control system (400) sends a command to start printing, and the control system (400) controls the gear-driven servo (203), the connecting rod-driven servo (208), the semiconductor laser (207), the nozzle (210) and the XYZ three-axis motion module (300) to start printing; the control system (400) controls the gear-driven servo (203), the connecting rod-driven servo (208), the semiconductor laser (207), the nozzle (210) and the XYZ three-axis motion module (300) to complete the printing and trajectory enhancement of the current layer track.

[0026] Step 4: Print in multiple layers. (4-1) After the first layer enhancement is completed, the control system (400) detects the G-code code to determine the printing path of the current layer, and uses the semiconductor laser (207) to rescan the path of the current first layer. At the same time, the laser power can be dynamically adjusted through the control system (400) to complete the enhancement processing of the current layer; the control system (400) controls the gear-driven servo (203), the connecting rod-driven servo (208), the semiconductor laser (207), the nozzle (210) and the XYZ three-axis motion module (300) to move up one layer, and then controls the motion module to move according to the G-code code of the next layer to print the second layer. (4-2) Repeat the above steps after printing the second layer and finally print the finished product.

[0027] This embodiment uses a 3D printing method that uses laser to enhance printing strength and multi-layer strength, which not only improves the strength of a single layer of the structure but also enhances the bonding strength between multiple layers, thereby realizing the integrated manufacturing of automated multi-layer components and effectively improving the manufacturing efficiency of 3D printed multi-layer structures.

[0028] The specific method is: while printing each path and each layer, each path and each layer of material are laser enhanced, and the whole is enhanced after all layers are completed.

[0029] The above-described embodiments are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for enhancing 3D printing strength using laser energy, characterized in that This method uses a device that can achieve laser enhancement of the interlayer strength of 3D printing, which can not only optimize single-layer printing but also enhance multi-layer 3D printing in real time.

2. According to claim 1, a method for enhancing the strength of 3D printing by using laser energy can control the control system, the nozzle system, and the steering gear transmission system, and can complete the real-time enhancement of single-layer and multi-layer 3D printing through different system controls.

3. According to the method of claim 1, the device capable of realizing laser enhancement of interlayer strength of 3D printing is characterized in that it comprises: A frame (100), a laser system (200), an XYZ three-axis motion module (300), and a control system (400); the control system (400) is provided with a nozzle control unit, a motion control unit, a steering gear motion control unit, and a laser control unit; The laser system (200) is fixed on the frame (100) and connected to the control system (400). Through the control of the nozzle system in the control system (400), a plurality of materials are melted and extruded to form filamentary materials; the motion control unit performs motion control on the laser system (200) and the XYZ three-axis motion module (300); wherein the plurality of filamentary materials include but are not limited to PLA, ABS, PETG, etc.; The XYZ three-axis motion module (300) is installed on the frame (100) and connected to the control system (400) to drive the X-axis, Y-axis, Z-axis, and laser system (200) to move; the X-axis motor drives the X-axis and the laser system (200) to move; the Y-axis motor drives the Y-axis to move, and the Z-axis motor drives the Z-axis to move; the laser system (200) can move along the X-axis and Z-axis; the Y-axis can move along the Y-axis; The steering gear motion control unit in the control system (400) supports the motion path generated by the execution model, and generates corresponding motion G-code codes for controlling the steering gear transmission according to the position difference calculation, so as to realize the scanning of the front path and the scanning of the gaps between layers; according to the slicing result and the G-code code generation result, the movement of the laser system (200) is controlled to track and scan the interlayer structure at a fixed point to enhance the mechanical properties of the 3D printing interlayer.

4. According to the method for enhancing 3D printing strength by using laser energy as claimed in claim 1, the laser system (200) is characterized by comprising: A counterweight mounting frame (201), a driving gear (202), a gear-driven steering gear (203), a rotating bearing (204), a rotating bearing fixing seat (205), a nozzle protection cover (206), a semiconductor laser (207), a connecting rod-driven steering gear (208), a driving connecting rod (209), and a nozzle (210); The driving gear (202) is fixed on the nozzle protection cover (206); the driving gear (202) is fixed on the counterweight mounting frame (201), and the control system (400) controls the gear driving steering gear (203), thereby driving the driving gear (202) to move; the outer diameter of the rotating bearing (204) is fixed in the rotating bearing fixing seat (205), and the inner diameter is fixed on the nozzle protection cover (206); the lower end of the semiconductor laser (207) is fixed on the nozzle protection cover (206) by bolts, and the lowermost end of the semiconductor laser (207) is not lower than the lowermost end of the nozzle (210), and the upper end is connected to the connecting rod driving steering gear (208) through the driving connecting rod (209), and the connecting rod driving steering gear (208) drives the driving connecting rod (209) to move, thereby changing the irradiation angle of the semiconductor laser (207); The semiconductor laser (207) is connected to the control system (400), and the laser control unit and the motion control unit in the control system (400) can adjust the power of the semiconductor laser (207) in the laser system (200) according to the motion G-code code generated by the printed part slice, so that not only the 3D printing path can be preheated, but also the interlayer gap heating treatment can be performed; The semiconductor laser (207) is arranged around the nozzle (210) and fixed on the nozzle protection cover (206). The gear-driven steering gear (203) can be controlled by the steering gear motion control unit in the control system (400), thereby driving the driving gear (202), the nozzle protection cover (206), the semiconductor laser (207), the connecting rod driving steering gear (208), and the driving connecting rod (209) to move, so as to perform laser solidification on the 3D printing path and laser fusion of gaps between layers; The gear-driven steering engine (203) can drive the driving gear (202), the nozzle protection cover (206), the semiconductor laser (207), the connecting rod-driven steering engine (208), and the driving connecting rod (209) to move clockwise or counterclockwise; the connecting rod-driven steering engine (208) can drive the driving connecting rod (209) to change the semiconductor laser (207), and the change angle range is 0-45°.

5. In the device for enhancing the 3D printing strength of materials by using laser energy according to claim 4, the laser system (200) is characterized in that: The semiconductor laser (207) is supported and arranged around the nozzle (210) and can rotate clockwise or counterclockwise around the nozzle (210); the semiconductor laser (207) is arranged on the nozzle protection cover (206), and drives the driving gear (202) through the gear driving steering gear (203), thereby making the semiconductor laser (207) rotate clockwise or counterclockwise around the nozzle (210); at the same time, the semiconductor laser (207) is connected to the connecting rod driving steering gear (208) and the driving connecting rod (209), and drives the semiconductor laser (207) through the driving connecting rod (209). 07) angle change, the angle change range is 0-45°; the laser system (200) is connected to the motion control unit, the steering gear motion control unit and the laser control unit in the control system (400), and the relative position and angle between the semiconductor laser (207) and the nozzle (210) are automatically adjusted through the G-code code generated after program slicing, so that the semiconductor laser (207) performs laser solidification on the 3D printing path and the gap between layers; the maximum value of the laser power of the semiconductor laser (207) is less than the laser power value when the material reaches a completely molten state.

6. A method for enhancing 3D printing strength using laser energy according to claim 4, the method comprising the following steps: The control system (400) constructs a target model according to functional requirements, and slices the target model layer by layer; the printing parameters include setting parameters of the temperature of the nozzle (210) in the laser system (200), feed speed control parameters and acceleration control parameters, motion speed control parameters, temperature control parameters, XYZ three-axis motion control parameters, gear-driven steering gear (203), connecting rod-driven steering gear (208) transmission motion parameters, and semiconductor laser power parameters; The thickness between the nozzle (210) and the base plate in the laser system (200), the distance between the nozzle (210) and the semiconductor laser (207) in the laser system (200), and the angle between the semiconductor laser (207) and the Y axis in the laser system (200) are set, and the printing control program is started, and the operations of XYZ three-axis zeroing, base plate matching, etc. are started respectively to complete the printing position calibration, and the printing quality in the whole printing process is ensured; the nozzle control unit in the control system (400) adjusts the total flow rate of the nozzle (210) and keeps the flow rate constant until the stable printing requirement is met, that is, the printing is uninterrupted and the thickness of the printed material is uniform, and according to the motion G-code code information transmitted by the motion control unit in the control system (400), the parameters between the printing path and the semiconductor laser (207) are calculated and adjusted, and the angle between the semiconductor laser (207) and the nozzle (210) are controlled in real time; Start formal printing. During the printing process, the control system (400) converts the printing control program into G-code code to control the movement of each individual instrument unit, and controls the semiconductor laser (207) to melt the surface of the printing path. The laser control unit in the control system (400) adjusts the power of the semiconductor laser according to the motion G-code code information transmitted by the motion control unit until the printing is completed; After all layers of the target model are printed, the movement and power of the nozzle (210) and the semiconductor laser (207) are stopped, and an instruction is sent through the control system (400) to turn off the laser system (200) through the control instruction; and an instruction is sent through the control system (400) to control the XYZ three-axis motion module (300) to return to the starting position; The printing material is ejected, and finally a multi-layer target printing model is obtained.

7. The device for enhancing the 3D printing strength of materials by using laser energy according to claim 5, characterized in that: The laser system (200) is connected to a control system (400), wherein a gear-driven steering engine (203) and a connecting rod-driven steering engine (208) are connected to a steering engine motion control unit in the control system (400), wherein a semiconductor laser (207) is connected to a laser control unit in the control system (400), and wherein a nozzle (210) is connected to a nozzle control unit in the control system (400); the laser system (200) is connected to an X-axis motion module in an XYZ three-axis motion module (300) via a counterweight mounting frame (201) and a rotating bearing fixing seat (205); the XYZ three-axis motion module (300) comprises an X-axis motion module, a Y-axis motion module, and a Z-axis motion module, and all three are connected to a motion control unit in the control system (400). The Z-axis motion module is mounted on the frame (100) and connected to the control unit, and receives a signal from a motion control unit in the control system (400) to drive the laser system (200) to move in the Z direction; the X-axis motion module is mounted on the frame (100) and connected to the control system (400) to receive a signal from the motion control unit in the control system (400) to control the X-axis movement of the laser system (200) in the horizontal direction; the Y-axis motion module is mounted on the frame (100) and connected to the control system (400) to receive a signal from the motion control unit in the control system (400) to control the Y-axis movement in the horizontal direction; and the material is extruded through a nozzle (210) located in the laser system (200).

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