Additive manufacturing method for photoacoustic composite induction forming, workpiece and machining equipment

Abstract

The invention provides an additive manufacturing method for photoacoustic composite induction forming, a workpiece and machining equipment. The opto-acoustic composite induction molding additive manufacturing method comprises the following steps: preparing an acousto-optic sensitive material according to production requirements; a three-dimensional model of the workpiece to be manufactured is established, and the three-dimensional model is divided into a light-induced forming area and a sound-induced forming area; in the printing process, different structures of the three-dimensional model are recognized, and printing modes corresponding to the structures are determined; when the identified structure is a photo-induced molding area, photo-induced molding printing is adopted; when the recognized structure is a sound induction forming area, sound induction forming printing is adopted; and post-processing the printed workpiece. According to the method, the photo-induced forming technology and the sound-induced forming technology are integrated, different machining modes can be automatically selected according to the property of the to-be-machined area, the manufacturing period can be shortened, the production efficiency can be improved, and the machining flexibility is high; and manufacturing and forming of high-precision and large-size products can be achieved through photoacoustic composite induction forming.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to an additive manufacturing method, a workpiece and a processing device for photoacoustic composite induced molding. Background Art

[0002] Additive Manufacturing (AM, also known as 3D printing) is a manufacturing technology based on the discrete-accumulation principle. It manufactures the required objects layer by layer by stacking materials based on computer graphics data. Compared with traditional subtractive manufacturing, this technology has the advantages of high material utilization, short processing cycle, and customization, and realizes the possibility of production anytime, anywhere and on demand. Among the existing additive manufacturing technologies, light-induced molding (such as stereolithography, SLA) and acoustic-induced molding technology are two important molding methods.

[0003] Light-induced molding technology has the advantages of high precision and high printing efficiency, and it is easy to achieve high-precision large-area rapid molding. However, there are shortcomings when using single light-induced molding to print large-area products. For example, some photosensitive resin materials are easily affected by the environment and change during the molding process. These changes will lead to the quality of the final molded product and poor mechanical properties of the parts. In addition, the weak penetration of light cannot achieve isolation manufacturing. When there are structures with different precision and performance requirements on the components, light-induced molding is also difficult to achieve one-time molding of the product.

[0004] Unlike the propagation of light, ultrasound can propagate through opaque media. At the same time, it is easy to focus and locate to a specified area, and has a wide adjustable energy range. Based on the above advantages of ultrasound, acoustic induced molding technology has become an emerging additive manufacturing technology. In the field of additive manufacturing, acoustic induced molding technology has the advantages of cross-scale, multi-degree-of-freedom, adjustable material properties, penetrability, green and low energy consumption, etc. However, due to the limitations of current ultrasonic transducers and related equipment, single acoustic induced molding is prone to low printing resolution when performing large-area manufacturing.

[0005] Therefore, effectively combining light-induced molding technology and sound-induced molding technology to fully utilize the advantages of both to manufacture products is of great significance to improving existing additive manufacturing technology. Summary of the invention

[0006] In order to overcome the problems existing in the related art, one of the objects of the present invention is to provide an additive manufacturing method of photoacoustic composite induced molding, which integrates light induced molding and acoustic induced molding technologies, can automatically select different processing methods according to the properties of the area to be processed, can shorten the manufacturing cycle, improve production efficiency, and has high processing flexibility.

[0007] An additive manufacturing method of photoacoustic composite induction molding, comprising:

[0008] Prepare sound and light sensitive materials according to production requirements;

[0009] Establishing a three-dimensional model of the workpiece to be manufactured, and dividing the light-induced molding area and the sound-induced molding area in the three-dimensional model;

[0010] During the printing process, different structures of the 3D model are identified and the printing method corresponding to the structure is determined;

[0011] When the identified structure is a light-induced molding area, light-induced molding printing is adopted; when the identified structure is an acoustic-induced molding area, acoustic-induced molding printing is adopted;

[0012] Post-process the printed workpiece.

[0013] In a preferred technical solution of the present invention, the step of establishing a three-dimensional model of the workpiece to be manufactured and dividing the light-induced molding area and the sound-induced molding area in the three-dimensional model includes:

[0014] The three-dimensional model of the workpiece is divided into a light-induced molding area and a sound-induced molding area according to the machining accuracy, structural shape and structural stability of the workpiece.

[0015] In a preferred technical solution of the present invention, the three-dimensional model of the workpiece is divided into a light-induced molding area and a sound-induced molding area according to the machining accuracy, structural shape and structural stability of the workpiece, including:

[0016] The light induced molding area:

[0017] Processing accuracy requirements: workpiece surface roughness Ra is less than 5 microns; workpiece layer thickness is 25μm-50μm; during printing, the resolution in the X-axis and Y-axis directions is 50μm-100μm;

[0018] Structural shape: including hollow designs, multiple nested components, internal cavities of workpieces, surface textures, thin-wall structures, curved surfaces or microchannels;

[0019] Structural stability: elastic modulus is 1GPa-3GPa, yield strength is usually 10MPa-100MPa, and tensile strength is 20MPa-60MPa;

[0020] The acoustic induction forming area:

[0021] Processing accuracy requirements: the surface roughness Ra of the workpiece is greater than 10μm, the layer thickness of the workpiece is greater than 50μm, and the resolution in the X-axis and Y-axis directions during printing is 200μm-500μm;

[0022] Structural shape: including flat or curved structures, multi-layer structures, and structures with internal fillings;

[0023] Structural stability: elastic modulus is 1GPa-10GPa, yield strength is usually 0.5MPa-200MPa, and tensile strength is 1MPa-50MPa.

[0024] In a preferred technical solution of the present invention, when the identified structure is a light-induced molding area, light-induced molding printing is adopted, including:

[0025] The steps of light-induced molding printing are as follows:

[0026] Slice the area to be printed to obtain a series of cross-sectional graphics with layer thickness;

[0027] Adjust printing parameters according to the characteristics of the sound and light sensitive material, the performance and type of the printer, and the area to be printed;

[0028] Use the adjusted parameters to perform light-induced molding printing, and perform light-induced molding of the obtained cross-sectional graphics layer by layer.

[0029] In a preferred technical solution of the present invention, the printing parameters include printing layer thickness, exposure time, light source intensity, and reaction time.

[0030] In a preferred technical solution of the present invention, when the identified structure is an acoustic induction molding area, acoustic induction molding printing is adopted, including:

[0031] The steps of acoustic induction molding printing are as follows:

[0032] Set the acoustic induction molding parameters according to the area to be printed;

[0033] According to the set acoustic induction molding parameters, the ultrasonic transducer is controlled to move and the acoustic induction molding parameters are printed;

[0034] The acoustic induced molding parameters include ultrasonic power, duty cycle, and printing path.

[0035] In a preferred technical solution of the present invention, the sound and light sensitive material includes a free radical prepolymer, a photoinitiator, a thermal initiator, an induction molding agent, and a regulating agent, and the regulating agent includes any one or more of metal powder, ceramic powder, glass fiber, and diamond;

[0036] After the sound and light sensitive material is prepared, the sound and light sensitive material is placed in a vacuum drying oven for degassing treatment.

[0037] A second object of the present invention is to provide a workpiece produced by the additive manufacturing method of photoacoustic composite induced molding as described above;

[0038] The workpiece includes a base and a connecting member, wherein the connecting member is arranged on the top of the base; the base includes two substrates arranged opposite to each other, a honeycomb structure is arranged between the two substrates, and the honeycomb structure includes a honeycomb frame and a supporting member, wherein the supporting member is arranged in the honeycomb frame;

[0039] Wherein, the substrate and the honeycomb frame are both formed by light induction, and the connecting member and the supporting member are formed by sound induction.

[0040] The third object of the present invention is to provide a processing device for implementing the additive manufacturing method of photoacoustic composite induced molding as described above;

[0041] The processing equipment includes a material trough and a frame, wherein the frame is arranged above the material trough, and the material trough is provided with a molding platform for molding workpieces. A driving structure, a light-induced molding device and a sound-induced molding device are arranged on the frame, and the driving structure drives the light-induced molding device and the sound-induced molding device to move above the material trough.

[0042] In a preferred technical solution of the present invention, a scraper is provided in the material trough, the scraper is provided above the forming platform, and the scraper can move in the material trough along the horizontal direction.

[0043] The beneficial effects of the present invention are:

[0044] The present invention provides an additive manufacturing method of photoacoustic composite induced molding, which includes: preparing photoacoustic sensitive materials according to production requirements; establishing a three-dimensional model of a workpiece to be manufactured, and dividing a photoinduced molding area and a sound induced molding area in the three-dimensional model; identifying different structures of the three-dimensional model during printing, and determining the printing method corresponding to the structure; when the identified structure is a photoinduced molding area, light induced molding printing is adopted; when the identified structure is a sound induced molding area, sound induced molding printing is adopted; and post-processing is performed on the printed workpiece. The method integrates photoinduced molding and sound induced molding technologies. In practical applications, the photoinduced molding technology can be used to manufacture workpieces with low surface roughness and high dimensional accuracy to meet the needs of precision engineering. The sound induced molding technology can be used to manufacture complex internal structures that are difficult to achieve with traditional manufacturing methods, such as porous structures or flexible structures. By automatically identifying different structures of the three-dimensional model and selecting different processing methods for production, it is helpful to shorten the manufacturing cycle and improve production efficiency. In addition, the method can flexibly adjust the material formula and printing parameters according to different design requirements and application scenarios to adapt to the changing production needs.

[0045] The present application also provides a workpiece manufactured by the additive manufacturing method using the above-mentioned photoacoustic composite induced molding and a device for executing the above-mentioned method. The equipment has a wide range of applications and high processing flexibility, and can achieve rapid manufacturing of large-area complex components. It has the characteristics of high precision, high efficiency, convenience, flexibility and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Reference numerals:

[0047] 1. Substrate; 2. Honeycomb structure; 3. Connector; 21. Honeycomb frame; 22. Support; 100. Material trough; 200. Forming platform; 300. Scraper; 400. Sound-induced forming device; 500. Driving structure; 600. Light-induced forming device. Description of the drawings:

[0049] Figure 1 is a flow chart of an additive manufacturing method of photoacoustic composite induced molding provided in an embodiment of the present invention;

[0050] Figure 2 is a schematic structural diagram of a workpiece provided in an embodiment of the present invention;

[0051] Figure 3 is a schematic structural diagram of a honeycomb structure provided in an embodiment of the present invention;

[0052] Figure 4 is a manufacturing flow chart of a workpiece provided in an embodiment of the present invention;

[0053] Figure 5 It is a schematic diagram of the structure of the processing equipment provided in the embodiment of the present invention. DETAILED DESCRIPTION

[0054] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0055] Additive Manufacturing (AM, also known as 3D printing) is a manufacturing technology based on the discrete-accumulation principle. It manufactures the required objects layer by layer by stacking materials based on computer graphics data. Compared with traditional subtractive manufacturing, this technology has the advantages of high material utilization, short processing cycle, and customization, and realizes the possibility of production anytime, anywhere and on demand. Among the existing additive manufacturing technologies, light-induced molding (such as stereolithography, SLA) and acoustic-induced molding technology are two important molding methods.

[0056] However, both the current light-induced molding and acoustic-induced molding technologies have defects. Based on this, the present application provides an additive manufacturing method of light-acoustic composite induced molding.

[0057] Example 1

[0058] like Figure 1 As shown, this embodiment provides an additive manufacturing method of photoacoustic composite induction molding, comprising:

[0059] S100, preparing sound and light sensitive materials according to production requirements;

[0060] Specifically, the acoustic and light sensitive material includes a free radical prepolymer, a photoinitiator, a thermal initiator, an induction molding agent, and a regulating agent, wherein the regulating agent includes any one or more of metal powder, ceramic powder, glass fiber, and diamond; after the acoustic and light sensitive material is prepared, the acoustic and light sensitive material is placed in a vacuum drying box for degassing. Degassing can prevent material bubbles from affecting the induction molding effect on the one hand, and can optimize the conduction of sound waves on the other hand, and can also reduce the internal defects of the parts after molding.

[0061] S200, establish a three-dimensional model of the workpiece to be manufactured, and divide the light-induced molding area and the acoustic-induced molding area in the three-dimensional model; in the modeling process, use 3D modeling software to establish a three-dimensional model of the workpiece to be manufactured. In the model, the light-induced molding area and the acoustic-induced molding area are divided according to the accuracy requirements, mechanical properties and thermal stability of the structure. For example, for external structures that require high precision and high strength, they are divided into light-induced molding areas; and for internal complex support structures or parts that require flexible characteristics, they are divided into acoustic-induced molding areas.

[0062] S300, during the printing process, identifying different structures of the three-dimensional model and determining the printing method corresponding to the structure;

[0063] During the printing process, different structures in the 3D model are identified through dedicated printing control software. The software can automatically identify the light-induced molding area and the sound-induced molding area, and configure the corresponding printing parameters for each area, or the software prompts the production staff to manually adjust the printing parameters.

[0064] S400, when the identified structure is a light-induced molding area, light-induced molding printing is adopted; when the identified structure is a sound-induced molding area, sound-induced molding printing is adopted;

[0065] S500, post-processing the printed workpiece. Post-processing includes cleaning to remove un-induced molding materials, thermal induction molding to improve the mechanical properties of the workpiece, and possible surface treatment such as grinding, polishing or painting to meet the requirements of the final application.

[0066] The above-mentioned photoacoustic composite induced molding additive manufacturing method integrates photoinduced molding and acoustic induced molding technologies. In practical applications, the photoinduced molding technology can be used to manufacture workpieces with low surface roughness and high dimensional accuracy to meet the needs of precision engineering. The acoustic induced molding technology can be used to manufacture complex internal structures that are difficult to achieve with traditional manufacturing methods, such as porous structures or flexible structures.

[0067] By automatically identifying different structures of the 3D model and selecting different processing methods for production, it helps to shorten the manufacturing cycle and improve production efficiency. In addition, this method can flexibly adjust the material formula and printing parameters according to different design requirements and application scenarios to adapt to changing production needs. In actual applications, light-induced molding can achieve the printing of structures with a maximum size of 400mm×300mm×350mm and a maximum precision of 50μm through the DMD's high-resolution micromirror array, fast image projection, precise light source control, and large-area distribution of uniform illumination. Acoustic-induced molding can achieve the printing of structures with a maximum size of 400mm×300mm×350mm and a maximum precision of 200μm through the precise control of sound waves, the uniformity of the sound field, the high-precision multi-degree-of-freedom motion platform, and the flexible replacement of ultrasonic transducers.

[0068] In this application, a method for dividing the light-induced molding area and the sound-induced molding area is provided, as follows:

[0069] The step of establishing a three-dimensional model of the workpiece to be manufactured and dividing the light-induced molding area and the sound-induced molding area in the three-dimensional model includes:

[0070] The three-dimensional model of the workpiece is divided into a light-induced molding area and a sound-induced molding area according to the machining accuracy, structural shape and structural stability of the workpiece.

[0071] More specifically, the three-dimensional model of the workpiece is divided into a light-induced molding area and a sound-induced molding area according to the machining accuracy, structural shape and structural stability of the workpiece, including:

[0072] The light induced molding area:

[0073] Processing accuracy requirements: the workpiece surface roughness Ra is less than 5 microns; the workpiece layer thickness is 25μm-50μm; during the printing process, the resolution in the X-axis and Y-axis directions is 50μm-100μm; the area of ​​light-induced molding processing requires high-precision detail performance, such as fine surface texture or thin-wall structure.

[0074] Structural shape: including hollow designs, multiple nested components, internal cavities of workpieces, surface textures, thin-wall structures, curved surfaces or microchannels;

[0075] Structural stability: elastic modulus is 1GPa-3GPa, yield strength is usually 10MPa-100MPa, and tensile strength is 20MPa-60MPa;

[0076] The acoustic induction forming area:

[0077] Processing accuracy requirements: the surface roughness Ra of the workpiece is greater than 10μm, the layer thickness of the workpiece is greater than 50μm, and the resolution in the X-axis and Y-axis directions during printing is 200μm-500μm;

[0078] Structural shape: including flat or curved structures, multi-layer structures, and structures with internal fillings;

[0079] Structural stability: elastic modulus is 1GPa-10GPa, yield strength is usually 0.5MPa-200MPa, and tensile strength is 1MPa-50MPa.

[0080] In this application, by dividing the area according to the characteristics of the workpiece to be produced, the three-dimensional model of the workpiece is divided into a light-induced molding area and a sound-induced molding area, so that in the subsequent processing, light-induced molding or sound-induced molding can be directly selected according to the characteristics of the workpiece to be processed. By accurately dividing the light-induced molding area, it can be ensured that the key parts of the workpiece achieve the required high precision and surface quality. In addition, by reasonably dividing the sound-induced molding area, the demand for high-precision printing technology can be reduced, thereby saving costs and materials.

[0081] Furthermore, when the identified structure is a light-induced molding area, light-induced molding printing is adopted, including:

[0082] The steps of light-induced molding printing are as follows:

[0083] The area to be printed is sliced ​​to obtain a series of cross-sectional graphics with layer thickness; slicing is to decompose the complete 3D model into a series of 2D layers with a certain thickness. Each layer represents a small, flat graphic in the printing process. The thickness of the slice depends on the compatibility of the printer and the material and the complexity of the light-induced molding structure.

[0084] The printing parameters are adjusted according to the characteristics of the photoacoustic-sensitive material, the performance and type of the printer, and the area to be printed; more specifically, the printing parameters include the printing layer thickness, exposure time, light source intensity, and reaction time. In actual applications, the above printing parameters can be set manually, and can be set according to the photosensitive characteristics of the printing material used, the performance and type of the printer, the structural characteristics of the area to be printed, and other parameters. It is also possible to establish a database of printing parameters in the printing device, and then directly select the corresponding printing parameters according to the specific characteristics of the area to be printed.

[0085] The adjusted parameters are used for light-induced molding printing, and the obtained cross-sectional graphics are light-induced molded layer by layer.

[0086] During the printing process, the adjusted parameters are used to perform photo-induced molding on the obtained cross-sectional pattern layer by layer using a high-precision DLP printer. The printer's digital micromirror device (DMD) modulates the light source according to the cross-sectional pattern, and irradiates the pattern onto the surface of the photosensitive material through the projection objective lens to achieve layer-by-layer induced molding. During the printing process, complex geometric shapes and details can be accurately reproduced through layer-by-layer photo-induced molding, including hollow designs, multiple nested components, internal cavities, surface textures, thin-walled structures, curved surfaces or microchannels. The photo-induced molding of this application can achieve 3D printing of structures with a maximum size of 400mm×300mm×350mm and a maximum accuracy of 50μm.

[0087] In this embodiment, when the identified structure is an acoustic induction molding area, acoustic induction molding printing is adopted, including:

[0088] The steps of acoustic induction molding printing are as follows:

[0089] The acoustic induction molding parameters are set according to the area to be printed; the acoustic induction molding parameters include ultrasonic power, duty cycle, and printing path. Select the appropriate ultrasonic power to ensure that the material can be effectively induced to form under the action of the sound field, while avoiding material damage or structural deformation caused by excessive power. Adjust the ultrasonic duty cycle to control the energy input and induced molding effect during the acoustic induction molding process, and achieve precise control of the induced molding depth and induced molding quality. The printing path is to plan the movement path of the ultrasonic transducer to ensure that the area to be printed can be induced to form evenly and comprehensively.

[0090] According to the set acoustic induction molding parameters, the ultrasonic transducer is controlled to move and the acoustic induction molding parameters are printed;

[0091] Specifically, a multi-axis motion control system is used to precisely control the movement of the ultrasonic transducer. The transducer moves above the area to be printed according to a predetermined printing path, and transfers ultrasonic energy to the material through a focused or arrayed sound field to achieve acoustic induced molding printing. During the acoustic induced molding process, the ultrasonic energy emitted by the ultrasonic transducer penetrates the surface of the material, and induces the thermosetting material to form in a specified area through mechanical, physical, and chemical response mechanisms. This process can penetrate opaque media and achieve precise molding of complex geometries and heterogeneous materials. By combining acoustic induced molding with light induced molding, the defect of low resolution of acoustic induced molding of large-area products can be overcome, so that the printing of structures with a maximum size of 400mm×300mm×350mm and a maximum accuracy of 200μm can be achieved.

[0092] Example 2

[0093] like Figure 2-Figure 4 As shown, this embodiment provides a workpiece, which is produced by the additive manufacturing method of photoacoustic composite induced molding as described above;

[0094] The workpiece includes a base and a connecting member 3, wherein the connecting member 3 is arranged on the top of the base; the base includes two substrates 1 arranged opposite to each other, a honeycomb structure 2 is arranged between the two substrates 1, and the honeycomb structure 2 includes a honeycomb frame 21 and a supporting member 22, wherein the supporting member 22 is arranged in the honeycomb frame 21;

[0095] The substrate 1 and the honeycomb frame 21 are both formed by light induction molding, and the connector 3 and the support member 22 are formed by sound induction molding.

[0096] In the workpiece, the honeycomb structure 2 can provide a light and high-strength support. The support member 22 is arranged in the honeycomb frame 21 to enhance the stability and bearing capacity of the entire structure.

[0097] The workpiece can be used in body structures, interiors and protective equipment. Its light weight, high strength and good thermal insulation properties make it an ideal choice for automotive manufacturing.

[0098] In the field of construction, the workpiece can be used for light walls, floors, etc. for heat insulation. The design of the connector 3 makes it easy to embed it into the wall, thereby improving the stability and safety of the building.

[0099] Moreover, the workpiece is manufactured by combining light-induced molding and sound-induced molding technology, so that each part of the workpiece can be precisely formed, with high production efficiency and low manufacturing cost.

[0100] Specifically, the manufacturing process of the workpiece is as follows:

[0101] First, prepare the sound and light sensitive material; according to the performance requirements of the printed component, the components of the sound and light sensitive material are proportioned, and after the material preparation is completed, the material is degassed, and then the material is added to the material tank 100;

[0102] Determine the induced molding method of each structure in the model processing software, and then divide the area, where the substrate 1 and the honeycomb frame 21 are light-induced molding structures, and the connector 3 and the support are sound-induced molding structures;

[0103] The printing layer thickness is set to 100 μm, and the light-induced molding parameters such as exposure time, light source intensity, and reaction time are also set, and then the bottom substrate 1 and the honeycomb frame 21 on the substrate 1 are light-induced molded layer by layer;

[0104] After the light-induced molding is completed, an array ultrasonic transducer with an operating frequency of 37kHz is installed on the transducer fixture, and the ultrasonic power and duty cycle are set. The support members 22 of all honeycomb frames 21 are selected in the 3D printing model processing software, and the printing path of the acoustic-induced molding is generated, and then the acoustic-induced molding printing of the support members 22 is performed; the support members 22 are columnar structures in the honeycomb frame 21;

[0105] After the acoustic induced molding is completed, the ultrasonic transducer returns to the starting position, and then the optical induced molding printing of the top substrate 1 is performed, and the optical induced molding parameters are not modified;

[0106] After the photoinduced molding printing of the top substrate 1 is completed, the ultrasonic transducer is replaced with an ultrasonic transducer with an operating frequency of 60kHz and a flat head, and the ultrasonic power and duty cycle are set. The connector 3 is selected in the 3D printing model processing software, and the printing path of the acoustic induced molding is generated. Then, the acoustic induced molding printing of the connector 3 on the top of the base is performed;

[0107] After printing is completed, the target component is removed from the part forming platform 200 and placed in a cleaning agent to remove residual uninduced forming materials, and then post-processed and surface treated.

[0108] Example 3

[0109] As shown in 5, this embodiment provides a processing device for implementing the additive manufacturing method of photoacoustic composite induced molding as described above;

[0110] The processing equipment includes a trough 100 and a frame, the frame is arranged above the trough 100, the trough 100 is provided with a forming platform 200 for forming a workpiece, and a driving structure 500, a light-induced forming device 600 and a sound-induced forming device 400 are arranged on the frame, and the driving structure 500 drives the light-induced forming device 600 and the sound-induced forming device 400 to move above the trough 100. The driving structure 500 can be a three-axis driving device to drive the light-induced forming device 600 and the sound-induced forming device 400 to move in the X, Y, and Z axis directions.

[0111] More specifically, a scraper 300 is disposed in the material trough 100 . The scraper 300 is disposed above the molding platform 200 , and the scraper 300 can move in the material trough 100 along a horizontal direction.

[0112] More specifically, a lifting drive device for driving the forming platform 200 to rise and fall is provided on the frame. In actual use, after one layer of structure is printed, the lifting drive device drives the forming platform to descend, and the scraper 300 is driven to move horizontally in the material trough 100 at this time to achieve re-laying of the material so as to print the next layer of structure.

[0113] The equipment has a wide range of applications and high processing flexibility. It can realize the rapid manufacturing of large-area complex components and has the characteristics of high precision, high efficiency, convenience, flexibility and wide applicability. The process of using the equipment for additive manufacturing is as follows:

[0114] First, production personnel need to proportion the material composition of the sound and light sensitive material according to the printing requirements, including free radical prepolymer, photoinitiator, thermal initiator, plasticizer and toughening agent. After the material proportioning is completed, degassing is performed to remove the gas dissolved in the material to prevent the formation of bubbles during the printing process. Then, the degassed material is added to the material tank of the equipment to make the sound and light sensitive material liquid.

[0115] The 3D model of the workpiece is divided into regions in the 3D printing model processing software, and the model structure is divided into light-induced molding and acoustic-induced molding regions according to printing requirements. The software identifies each structure of the model from bottom to top and determines whether the structure needs light-induced molding or acoustic-induced molding.

[0116] The identified LIM structure is sliced ​​and divided into a series of cross-sectional graphics with layer thickness. Then, the LIM parameters are set, including printing layer thickness, exposure time, light source intensity, reaction time, etc.

[0117] Before the start of light-induced molding, the part molding platform and the printed model part are lowered as a whole to a distance of one layer thickness from the material liquid surface. The computer transmits the cross-sectional graphics to the digital micromirror device (DMD) in the light-induced molding device, and the DMD presents a pattern consistent with the cross-sectional graphics. After that, the light source irradiates the DMD, which modulates and reflects the incident light. The reflected light is shaped by the projection objective lens and irradiates the sound-light sensitive material above the part molding platform for selective induced molding. After obtaining the induced molding layer, the part molding platform and the printed model part are lowered as a whole by another layer thickness.

[0118] The scraper device then evenly scrapes the photoacoustic sensitive material by horizontal movement in the X-axis direction to ensure that the thickness of each printed layer is consistent. Then, the next cross-sectional pattern is printed, and the above printing and material scraping steps are repeated until the printing of the light-induced molding structure is completed.

[0119] During the light-induced molding process, an acoustic-induced molding device can be used for acoustic-induced molding. The computer generates a printing path for the structure to be acoustic-induced molded, where the acoustic-induced molding printing mode and the light-induced molding printing mode share a printing coordinate system;

[0120] Before the start of acoustic induction molding, the part molding platform and the printed model part are lowered below the liquid surface as a whole. The ultrasonic transducer is moved to the top of the printed model part according to the printing path through a high-precision multi-degree-of-freedom motion platform. When the transducer reaches the starting printing position, the structure is printed according to the printing path generated by the computer; after the printing of the acoustic induction molding structure is completed, the acoustic induction molding device returns to the starting position, and the scraper device evenly scrapes the sound and light sensitive material through horizontal movement in the X-axis direction; the process of acoustic induction molding and light induction molding is repeated until the printing of the entire component is completed.

[0121] After the entire component is printed by light-induced molding, the part molding platform is raised above the liquid surface. The target component is removed from the part molding platform and placed in a cleaning agent (such as alcohol, acetone, etc.) to remove the residual uninduced molding material. Finally, post-processing and surface treatment such as trimming, polishing, painting, etc. are performed as needed to give the printed object a better appearance and performance.

[0122] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0123] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An additive manufacturing method of photoacoustic composite induction molding, characterized in that: include: Prepare sound and light sensitive materials according to production requirements; Establishing a three-dimensional model of the workpiece to be manufactured, and dividing the light-induced molding area and the sound-induced molding area in the three-dimensional model; During the printing process, different structures of the 3D model are identified and the printing method corresponding to the structure is determined; When the identified structure is a light-induced molding region, light-induced molding printing is adopted; When the identified structure is an acoustic induction molding area, acoustic induction molding printing is adopted; Post-process the printed workpiece.

2. The additive manufacturing method of photoacoustic composite induction molding according to claim 1, characterized in that: The step of establishing a three-dimensional model of the workpiece to be manufactured and dividing the light-induced molding area and the sound-induced molding area in the three-dimensional model includes: The three-dimensional model of the workpiece is divided into a light-induced molding area and a sound-induced molding area according to the machining accuracy, structural shape and structural stability of the workpiece.

3. The additive manufacturing method of photoacoustic composite induction molding according to claim 2, characterized in that: The three-dimensional model of the workpiece is divided into a light-induced molding area and a sound-induced molding area according to the machining accuracy, structural shape and structural stability of the workpiece, including: The light induced molding area: Processing accuracy requirements: workpiece surface roughness Ra is less than 5 microns; workpiece layer thickness is 25μm-50μm; during printing, the resolution in the X-axis and Y-axis directions is 50μm-100μm; Structural shape: including hollow designs, multiple nested components, internal cavities of workpieces, surface textures, thin-wall structures, curved surfaces or microchannels; Structural stability: elastic modulus is 1GPa-3GPa, yield strength is usually 10MPa-100MPa, and tensile strength is 20MPa-60MPa; The acoustic induction forming area: Processing accuracy requirements: the surface roughness Ra of the workpiece is greater than 10μm, the layer thickness of the workpiece is greater than 50μm, and the resolution in the X-axis and Y-axis directions during printing is 200μm-500μm; Structural shape: including flat or curved structures, multi-layer structures, and structures with internal fillings; Structural stability: elastic modulus is 1GPa-10GPa, yield strength is usually 0.5MPa-200MPa, and tensile strength is 1MPa-50MPa.

4. The additive manufacturing method of photoacoustic composite induction molding according to claim 1, characterized in that: When the identified structure is a light-induced molding area, light-induced molding printing is adopted, including: The steps of light-induced molding printing are as follows: Slice the area to be printed to obtain a series of cross-sectional graphics with layer thickness; Adjust printing parameters according to the characteristics of the sound and light sensitive material, the performance and type of the printer, and the area to be printed; The adjusted parameters are used for light-induced molding printing, and the obtained cross-sectional graphics are light-induced molded layer by layer.

5. The additive manufacturing method of photoacoustic composite induction molding according to claim 4, characterized in that: The printing parameters include printing layer thickness, exposure time, light source intensity, and reaction time.

6. The photoacoustic composite induction molding additive manufacturing method according to claim 3, characterized in that: When the identified structure is an acoustic induction molding area, acoustic induction molding printing is adopted, including: The steps of acoustic induction molding printing are as follows: Set the acoustic induction molding parameters according to the area to be printed; According to the set acoustic induction molding parameters, the ultrasonic transducer is controlled to move and acoustic induction molding printing is performed; The acoustic induced molding parameters include ultrasonic power, duty cycle, and printing path.

7. The additive manufacturing method of photoacoustic composite induction molding according to any one of claims 1 to 6, characterized in that: The acoustic-optic sensitive material includes a free radical prepolymer, a photoinitiator, a thermal initiator, an induction molding agent, a regulating agent, etc. The regulating agent includes any one or more of metal powder, ceramic powder, glass fiber, and diamond; After the sound and light sensitive material is prepared, the sound and light sensitive material is placed in a vacuum drying oven for degassing treatment.

8. A workpiece, characterized in that: Produced by the additive manufacturing method of photoacoustic composite induced molding as described in any one of claims 1 to 7; The workpiece includes a base and a connecting member, wherein the connecting member is arranged on the top of the base; the base includes two substrates arranged opposite to each other, a honeycomb structure is arranged between the two substrates, and the honeycomb structure includes a honeycomb frame and a supporting member, wherein the supporting member is arranged in the honeycomb frame; Wherein, the substrate and the honeycomb frame are both formed by light induction, and the connecting member and the supporting member are formed by sound induction.

9. A processing equipment, characterized in that: Used to implement the additive manufacturing method of photoacoustic composite induced molding as described in any one of claims 1 to 7; The processing equipment includes a material trough and a frame, wherein the frame is arranged above the material trough, and the material trough is provided with a molding platform for molding workpieces. A driving structure, a light-induced molding device and a sound-induced molding device are arranged on the frame, and the light-induced molding device and the sound-induced molding device are driven to move above the material trough.

10. The processing equipment according to claim 9, characterized in that: A scraper is arranged in the material trough, the scraper is arranged above the forming platform, and the scraper can move horizontally along the X-axis in the material trough.

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