An additive manufacturing method and end-use equipment for improving the forming quality of overhanging surfaces
By dividing the sliced layers into regions and using an overlapping molding strategy, the problems of powder adhesion, slag buildup, and warping deformation on overhanging surfaces in additive manufacturing were solved, achieving high-quality molding of overhanging areas, reducing printing costs, and expanding the applicability of SLM.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEI JING XIN JING HE ZENG CAI ZHI ZAO JI SHU YOU XIAN GONG SI
- Filing Date
- 2024-12-30
- Publication Date
- 2026-06-30
AI Technical Summary
In the additive manufacturing process, overhanging surfaces are prone to problems such as powder adhesion, slag buildup, and warping deformation. Existing technologies require the addition of support structures, which increases printing time and material consumption, and cannot remove the roughness of the support surface, thus preventing the formation of the final product.
By dividing the sliced layers into regions and using an overlapping forming strategy, non-overhanging and overhanging areas are identified, combined overhanging areas are formed, and overlapping is performed between overhanging areas and combined overhanging areas, as well as between combined overhanging areas and non-overhanging areas, thereby reducing printing costs and expanding the applicability of SLM.
While ensuring the molding quality of the overhanging area, it reduces printing costs and expands the applicability of SLM technology, making it particularly suitable for molding parts with complex flow channels.
Smart Images
Figure CN122299010A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of additive manufacturing technology, and in particular to an additive manufacturing method and terminal equipment for improving the forming quality of overhanging surfaces. Background Technology
[0002] Selective Laser Melting (SLM) is a technology that uses metal powder to form parts. As a type of additive manufacturing technology, it has advantages such as high design freedom for complex parts, short process flow, and high degree of personalization in production. It can manufacture complex, intricate, and lightweight structures and has wide applications in aerospace, medical devices, transportation, and nuclear industries.
[0003] However, during additive manufacturing, due to the thermoforming characteristics of SLM (Surface Mount Molding) with its layer-by-layer melting and accumulation, overhanging surfaces are prone to powder adhesion, slag buildup, and warping deformation. The main reason for powder adhesion and slag buildup on overhanging surfaces is insufficient support from the loose powder beneath the overhanging structure, resulting in poor heat dissipation and easy slag and powder adhesion. Furthermore, the residual thermal stress on the overhanging structure during SLM further exacerbates surface roughness and slag problems. Warping deformation in overhanging areas is caused by poor heat dissipation during the forming process, leading to poor molten pool stability and a tendency for warping. Additionally, thermal expansion and contraction and phase transformation effects during the heating-cooling process can also cause warping deformation.
[0004] The above problems generally require the addition of support structures to the overhanging areas to assist in heat dissipation and prevent warping of the molded parts due to thermal stress, especially in the molding of low-angle samples. However, adding support structures often comes with disadvantages such as increased printing time and material consumption, increased post-processing difficulty, and increased roughness of the support surface. Moreover, for some hollowed-out parts or parts with complex flow channels, SLM technology cannot be used because the internal supports cannot be removed.
[0005] Therefore, while ensuring the forming quality of the overhanging area, how to reduce printing costs and expand the applicability of SLM are technical problems that need to be solved by those skilled in the art. Summary of the Invention
[0006] The purpose of this invention is to provide an additive manufacturing method and terminal equipment for improving the forming quality of overhanging surfaces. The additive manufacturing method for improving the forming quality of overhanging surfaces provided by this invention can reduce printing costs and expand the applicability of SLM while ensuring the forming quality of the overhanging area.
[0007] To achieve the above objectives, the present invention provides the following technical solution:
[0008] In a first aspect, the present invention provides an additive manufacturing method for improving the forming quality of overhanging surfaces, comprising:
[0009] Obtain a three-dimensional model of the part, and determine the forming direction of the part based on the three-dimensional model;
[0010] The three-dimensional model is sliced to obtain multiple slice layers;
[0011] Identify the non-overhanging and overhanging regions of each slice layer, and each slice layer includes either a non-overhanging region or both a non-overhanging and overhanging regions.
[0012] The overhanging areas of each slice layer below the Nth layer in the multi-layer slice layer are mapped to the Nth layer to obtain a combined overhanging area. Overlapping forming areas are formed between the overhanging area of the Nth layer and the combined overhanging area, and between the combined overhanging area and the non-overhanging area of the Nth layer according to different preset parameters, so as to form a forming strategy for each slice layer. The slice layer that is attached to the substrate along the forming direction is the first slice layer, and N is greater than or equal to 2.
[0013] Based on the molding strategy, the molding equipment is controlled to perform additive molding, so that an overlap is formed between the overhanging area and the combined overhanging area of the Nth layer, and between the combined overhanging area and the non-overhanging area of the Nth layer.
[0014] Optionally, in the above-described additive manufacturing method for improving the quality of overhanging surface forming, identifying the non-overhanging area and the overhanging area of each slice layer includes: comparing the current slice layer with the adjacent next slice layer, wherein the area in the current slice layer that is in contact with the next slice layer is the non-overhanging area, and the overhanging area that is not in contact with the next slice layer is the overhanging area, so as to obtain the non-overhanging area and the overhanging area in the current slice layer.
[0015] Optionally, in the above-described additive manufacturing method for improving the quality of overhanging surface forming, the identification of non-overhanging areas and overhanging areas of each slice layer further includes: if the thickness of an overhanging area in the current slice layer that does not adhere to the next slice layer is greater than 0.01 mm and less than 0.1 mm, then the overhanging area is not determined to be the overhanging area.
[0016] Optionally, in the above-described additive manufacturing method for improving the forming quality of overhanging surfaces, the preset parameters include scaling values, and forming overlapping forming areas between the overhanging area and the combined overhanging area of the Nth layer, and between the combined overhanging area and the non-overhanging area of the Nth layer, according to different preset parameters, includes:
[0017] The overlapping forming area is formed by extending towards each other at the junction of the overhanging area and the combined overhanging area, and at the junction of the combined overhanging area and the non-overhanging area, by the scaling value.
[0018] Optionally, in the above-described additive manufacturing method for improving the forming quality of overhanging surfaces, the scaling value ranges from 0 mm to 1 mm.
[0019] Optionally, in the above-described additive manufacturing method for improving the forming quality of overhanging surfaces, the forming strategy for each slice layer further includes:
[0020] Additive molding of each slice layer is performed sequentially in the order of the non-overhanging region, the overhanging region, and the supporting structure.
[0021] Optionally, in the above-described additive manufacturing method for improving the forming quality of overhanging surfaces, the forming strategy for forming each slice layer further includes: performing additive forming of each slice layer sequentially along a direction gradually approaching the air vent.
[0022] In the additive manufacturing method for improving the forming quality of overhanging surfaces provided by this invention, after determining the forming direction of the part, the three-dimensional model is sliced to form multiple slice layers. Each slice layer includes a non-overhanging area, or includes both a non-overhanging area and an overhanging area. After each slice layer is divided, the layer that is in contact with the substrate is the first layer according to the forming direction of the part. When processing the Nth layer during the printing process, each layer below the Nth layer is first searched, and the overhanging areas of each layer are mapped to the Nth layer to obtain a combined overhanging area. At this time, an overlap forming area is formed between the overhanging area of the Nth layer and the combined overhanging area, and an overlap forming area is formed between the combined overhanging area and the non-overhanging area of the Nth layer. The overlap forming area is formed according to different preset parameters, thereby forming a forming strategy for each slice layer, where N is greater than or equal to 2. Finally, based on the above forming strategy, the forming equipment is controlled to perform additive forming. Compared with existing technologies, the additive manufacturing method for improving the forming quality of overhanging surfaces provided by this invention performs adaptive regional division of the slice layer, namely non-overhanging areas and overhanging areas. When processing the Nth layer, the overhanging areas in each layer below the Nth layer are mapped to the Nth layer. After intersection processing, a combined overhanging area is formed. Then, appropriate preset parameters are set between the overhanging area and the combined overhanging area in the Nth layer, and between the combined overhanging area and the non-overhanging area in the Nth layer, to form an overlapping forming area. This realizes the allocation of forming strategies to different areas of the part according to their own needs. The above forming strategy is used to form layers one by one, and the structural strength of the overhanging area is strengthened by overlapping layer by layer. This improves the forming quality of overhanging areas in each layer, reduces the risk of warping deformation in the overhanging area, meets the printing forming requirements of parts with forming angles of less than 45°, does not require the addition of support structures, reduces printing costs, and is especially suitable for SLM technology forming of parts with complex flow channels inside the parts where support cannot be added, thus improving the applicability of SLM technology.
[0023] Secondly, the present invention also provides a terminal device applied to a laser selective melting forming system with laser additive manufacturing equipment, the terminal device comprising:
[0024] The processing module is provided with a storage medium for storing the additive manufacturing method for improving the quality of overhanging surface forming as described in any of the preceding claims;
[0025] A communication module, connected to the processing module, is used for communication with the molding equipment.
[0026] The terminal device provided by the present invention, having the above-mentioned additive manufacturing method for improving the forming quality of overhanging surfaces, thus possesses all the technical effects of the above-mentioned additive manufacturing method for improving the forming quality of overhanging surfaces, which will not be repeated here. Attached Figure Description
[0027] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:
[0028] Figure 1 This is a flowchart of an additive manufacturing method for improving the forming quality of overhanging surfaces, as disclosed in an embodiment of the present invention.
[0029] Figure 2 This is a schematic diagram of the structure of the non-overhanging and overhanging regions in the slice layer disclosed in an embodiment of the present invention;
[0030] Figure 3 This is a control block diagram of a terminal device disclosed in an embodiment of the present invention. Detailed Implementation
[0031] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.
[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0036] The core of this invention lies in providing an additive manufacturing method with high quality of overhang surface forming, which can reduce printing costs and expand the applicability of SLM while ensuring the forming quality of the overhang area.
[0037] like Figure 1 and Figure 2 As shown, this embodiment of the invention discloses an additive manufacturing method for achieving high-quality overhanging surfaces, comprising the following steps:
[0038] Step 101: Obtain the 3D model of the part and determine the forming direction of the part based on the 3D model;
[0039] The 3D model of the part is constructed in 3D software based on the actual size of the part. The 3D software can be selected according to actual needs without specific limitations. At the same time, the forming direction of the part is determined, and the extension of less than 45° is minimized to reduce the need for support structure. It is also perpendicular to the printing direction to minimize the traces of interlayer contact and reduce surface roughness.
[0040] Step 102: Slice the 3D model to obtain multiple slice layers;
[0041] After determining the forming direction of the part, the three-dimensional model is sliced to obtain multiple slice layers. In a specific embodiment, the three-dimensional model is sliced along the XY plane according to the Z value direction to obtain multiple slice layers.
[0042] Step 103: Identify the non-overhanging and overhanging regions of each slice layer, and each slice layer includes a non-overhanging region, or includes both a non-overhanging and overhanging regions.
[0043] After the logarithmic model is sliced, each slice layer is divided into non-overhanging and overhanging regions depending on the situation. The non-overhanging surface is in contact with the surface of the adjacent slice layer, while the overhanging region is an extended area, meaning that the lower surface of the overhanging region is not in contact with the adjacent slice layer and has no supporting overhanging structure. Therefore, based on the division, each slice layer has two cases: one is that the slice layer only includes the non-overhanging region, and the other is that the slice layer includes a combination of the non-overhanging and overhanging regions.
[0044] Step 104: Map the overhang areas of each slice layer below the Nth layer to the Nth layer to obtain a combined overhang area. Then, form overlapping forming areas between the overhang area of the Nth layer and the combined overhang area, and between the combined overhang area and the non-overhang area of the Nth layer according to different preset parameters to form a forming strategy for each slice layer. The slice layer that is in contact with the substrate along the forming direction is the first slice layer, and N is greater than or equal to 2.
[0045] The overhanging areas in each slice layer below layer N are mapped to the intersection of layer N to obtain the combined overhanging area. At this time, slice layer N includes its own non-overhanging area and the combined overhanging area, or slice layer N includes its own non-overhanging area, overhanging area of layer N, and combined overhanging area. Then, overlapping areas are formed between the overhanging area of layer N and the combined overhanging area, and between the combined overhanging area and the non-overhanging area of layer N, according to corresponding preset parameters. When N=1, i.e., the first layer that is attached to the substrate, no mapping process is required. When N is greater than 1, the non-overhanging area Area in each layer is checked layer by layer down to N-1, and mapped to layer N to obtain the combined overhanging area: Areas{AreaN-1,AreaN-2,AreaN-3...}.
[0046] Step 105: Based on the molding strategy, control the molding equipment to perform additive molding, so that the overhanging area of the Nth layer and the combined overhanging area, as well as the combined overhanging area and the non-overhanging area of the Nth layer, form an overlap.
[0047] Finally, based on the above-mentioned slicing and forming strategy, the forming equipment is controlled to form layers by melting powder with laser, and to form overlaps between the overhanging area and the combined overhanging area of the Nth layer, and between the combined overhanging area and the non-overhanging area of the Nth layer.
[0048] The additive manufacturing method for improving the forming quality of overhanging surfaces provided by this invention divides the sliced layer into adaptive regions, namely non-overhanging regions and overhanging regions. When processing the Nth layer, the overhanging regions in each layer are mapped to the Nth layer. After intersection processing, a combined overhanging region is formed. Then, between the overhanging region and the combined overhanging region in the Nth layer, and between the combined overhanging region and the non-overhanging region in the Nth layer, overlapping forming regions are formed according to appropriate preset parameters. This realizes the allocation of forming strategies to different regions of the part according to their own needs. By implementing the above forming strategy layer by layer, the structural strength of the overhanging regions is strengthened by overlapping layer by layer, which improves the forming quality of overhanging regions in each layer, reduces the risk of warping deformation of overhanging regions, meets the printing forming requirements of parts with forming angles of less than 45°, eliminates the need to add support structures, and reduces printing costs. It is especially suitable for SLM technology forming of parts with complex flow channels inside that cannot be supported, thus improving the applicability of SLM technology.
[0049] In a specific embodiment, the identification of the non-overhanging and overhanging areas of each slice layer in step S103 specifically includes the following steps: by comparing the multiple slice layers layer by layer, that is, comparing the current slice layer with the adjacent next slice layer, the area in the current slice layer that is in contact with the next slice layer, that is, the area in the next slice layer that is supported by the next slice layer, is the non-overhanging area, while the area in the current slice layer that is not in contact with the next slice layer, that is, the area that is not supported and suspended, is the overhanging area. In this way, the non-overhanging and overhanging areas of each slice layer are determined layer by layer.
[0050] Furthermore, in the process of identifying non-overhanging and overhanging areas for each slice layer, if the thickness of the overhanging area in the Nth layer is greater than 0.01 mm but less than 0.1 mm, such as overhanging area thicknesses of 0.02 mm, 0.03 mm, 0.05 mm, 0.08 mm, or 0.09 mm, these areas have relatively narrow layer thicknesses and are less affected by overhang, so they do not need to be identified as overhanging areas. This further optimizes the forming strategy and improves the efficiency of forming the overlapping forming area. However, when the layer thickness is greater than or equal to 0.1 mm, it is necessary to determine whether it is a non-overhanging or overhanging area.
[0051] The additive manufacturing method for improving the forming quality of overhanging surfaces provided in this embodiment, in step 103, forms an overlapping forming area between the overhanging area and the combined overhanging area of the Nth layer, and between the combined overhanging area and the non-overhanging area of the Nth layer, according to appropriate preset parameters. The preset parameters include scaling values. At the junction of the overhanging area and the combined overhanging area, and at the junction of the combined overhanging area and the non-overhanging area, the overlapping forming area expands towards each other according to the input scaling values. That is, after inputting different scaling values between the overhanging area and the combined overhanging area, and between the combined overhanging area and the non-overhanging area, the junctions between the overhanging area and the combined overhanging area, and between the combined overhanging area and the non-overhanging area, expand towards each other according to the input scaling values, thereby forming an overlapping forming area. The overlapping forming area includes two parts that expand towards each other at the boundary between the two areas. In the actual molding process, for example, the non-overhanging area of the Nth layer is first additively molded. Then, according to a scaling value, a portion of the additive molding continues to extend from the boundary of the non-overhanging area towards one side of the combined overhanging area. Next, the combined overhanging area is molded. During the additive molding of the combined overhanging area, a portion of the additive molding is first extended from the boundary of the combined overhanging area towards one side of the non-overhanging area according to the scaling value, and then the combined overhanging area continues to be molded, so that the extended additive portions between the non-overhanging area and the combined overhanging area overlap. Similarly, the combined overhanging area overlaps with the overhanging area in the same way.
[0052] Specifically, the scaling value ranges from 0mm to 1mm. For example, the scaling value can be 0.2mm, 0.5mm, 0.6mm, or 0.8mm. Those skilled in the art can input the corresponding scaling value according to the actual overlapping requirements. If the scaling value is greater than this range, it will increase the workload of filling the overlapping area, leading to an increase in printing costs.
[0053] Meanwhile, the preset parameters in the additive manufacturing method for improving the forming quality of overhanging surfaces provided in this embodiment also include: laser power, scanning speed, spot diameter, fill spacing, fill offset, and number of layers. Laser power refers to the laser printing output power, and the energy density of the laser output is also crucial for the quality of the overhanging area formation. Higher output energy density will decrease the quality of the overhanging surface and increase the risk of warping deformation, while an appropriate energy density output can effectively improve the forming quality. Scanning speed is the laser beam emission speed, spot diameter is the laser spot diameter, and the number of layers is the number of slice layers formed after slicing the 3D model. Fill spacing is the distance between any two adjacent fill lines, and fill offset is the distance between the fill line and the inner contour. By setting the laser power, scanning speed, spot diameter, fill spacing, fill offset, and number of layers, the equipment is controlled to melt and form the powder layer by layer.
[0054] In one specific embodiment, the forming strategy for forming each slice layer in step 103 further includes: performing additive forming of each slice layer in the order of non-overhanging region, overhanging region and supporting structure.
[0055] This involves determining the processing order of the laser melting and forming process for each slice layer, prioritizing additive forming of non-overhanging areas, followed by overhanging areas, and finally additive forming of the supporting structure. The first-formed non-overhanging areas of this layer provide support for the connected overhanging areas. Forming the supporting structure after completing the overhanging areas not only ensures support for the overhanging areas but also improves the matching degree between the supporting structure and the overhanging areas by forming the required supporting structure based on the formed solid overhanging areas. Therefore, the additive forming process arranged in this sequence improves the stability of the solid structure formed in each layer. It is understood that those skilled in the art can plan the laser scanning sequence according to actual needs and are not limited to the sequence described above.
[0056] In another specific embodiment, the forming strategy for forming each slice layer in step 103 further includes: performing additive forming of each slice layer sequentially along the direction gradually approaching the air vent.
[0057] In additive manufacturing, if laser melting and forming are performed first near the air outlet, the splashed powder particles will be blown by the airflow into the powder layer laid away from the air outlet, interfering with the powder in these areas. Therefore, the additive manufacturing method for improving the forming quality of overhanging surfaces provided in this embodiment plans the laser scanning path according to the direction of the airflow from the air outlet. The scanning and forming are performed sequentially along the direction gradually approaching the air outlet, that is, additive forming is preferentially started from the end away from the air outlet, and then gradually moved towards the air outlet. This minimizes the interference of wind-blown powder on printing and improves the forming quality of printed parts.
[0058] like Figure 3 As shown, this embodiment of the invention also discloses a terminal device applied to a laser selective melting forming system with laser additive manufacturing equipment. The terminal device includes a processing module 110 and a communication module 120. The processing module 110 is provided with a storage medium storing the above-described additive manufacturing method for improving the forming quality of overhanging surfaces. The communication module 120 is connected to the processing module 110 and is used for communication with the forming equipment 200. The forming equipment 200 is communicationally connected to the processing module 110 through the communication module 120 of the terminal device.
[0059] The communication connection method in this embodiment of the invention can be wireless or wired communication. Wireless communication can be based on networking technologies such as Wi-Fi and Zigbee. Wired communication can be based on data lines or power line carrier communication. The communication interface can be a standard communication interface. This standard communication interface can be a serial interface or a parallel interface. For example, the terminal device can use I2C (Inter-Integrated Circuit) bus communication or power line carrier communication technology to achieve communication connection with the forming device 200.
[0060] Processing module 110 may be a processor or controller, such as a Central Processing Unit (CPU), a general-purpose processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the logic blocks, modules, and circuits described in connection with this disclosure. The processor may also be a combination that implements computational functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc. Communication module 120 may be a transceiver, transceiver circuitry, or communication interface, etc. Storage medium may be a memory.
[0061] Compared with the prior art, the beneficial effects of the terminal device provided in the embodiments of the present invention are the same as the beneficial effects of the additive manufacturing method described in the above technical solutions, and will not be repeated here.
[0062] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
[0063] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. An additive manufacturing method for improving the forming quality of overhanging surfaces, characterized in that, include: Obtain a three-dimensional model of the part, and determine the forming direction of the part based on the three-dimensional model; The three-dimensional model is sliced to obtain multiple slice layers; Identify the non-overhanging and overhanging regions of each slice layer, and each slice layer includes either a non-overhanging region or both a non-overhanging and overhanging regions. The overhanging areas of each slice layer below the Nth layer in the multi-layer slice layer are mapped to the Nth layer to obtain a combined overhanging area. Overlapping forming areas are formed between the overhanging area of the Nth layer and the combined overhanging area, and between the combined overhanging area and the non-overhanging area of the Nth layer according to different preset parameters, so as to form a forming strategy for each slice layer. The slice layer that is attached to the substrate along the forming direction is the first slice layer, and N is greater than or equal to 2. Based on the molding strategy, the molding equipment is controlled to perform additive molding, so that an overlap is formed between the overhanging area and the combined overhanging area of the Nth layer, and between the combined overhanging area and the non-overhanging area of the Nth layer.
2. The additive manufacturing method for improving the forming quality of overhanging surfaces according to claim 1, characterized in that, The identification of the non-overhanging and overhanging areas of each slice layer includes: comparing the current slice layer with the adjacent next slice layer, wherein the area in the current slice layer that is attached to the next slice layer is the non-overhanging area, and the overhanging area that is not attached to the next slice layer is the overhanging area, so as to obtain the non-overhanging and overhanging areas in the current slice layer.
3. The additive manufacturing method for improving the forming quality of overhanging surfaces according to claim 2, characterized in that, The identification of non-overhanging and overhanging areas of each slice layer further includes: if the thickness of an overhanging area in the current slice layer that does not adhere to the next slice layer is greater than 0.01 mm and less than 0.1 mm, then the overhanging area is not determined to be the overhanging area.
4. The additive manufacturing method for improving the forming quality of overhanging surfaces according to claim 1, characterized in that, The preset parameters include scaling values. The overlapping areas formed according to different preset parameters between the overhanging area and the combined overhanging area of the Nth layer, and between the combined overhanging area and the non-overhanging area of the Nth layer, include: The overlapping forming area is formed by extending towards each other at the junction of the overhanging area and the combined overhanging area, and at the junction of the combined overhanging area and the non-overhanging area, by the scaling value.
5. The additive manufacturing method for improving the forming quality of overhanging surfaces according to claim 4, characterized in that, The scaling value ranges from 0 mm to 1 mm.
6. The additive manufacturing method for improving the forming quality of overhanging surfaces according to claim 1, characterized in that, The forming strategy for each slice layer also includes: Additive molding of each slice layer is performed sequentially in the order of the non-overhanging region, the overhanging region, and the supporting structure.
7. The additive manufacturing method for improving the forming quality of overhanging surfaces according to claim 1, characterized in that, The forming strategy for each slice layer also includes: performing additive forming of each slice layer sequentially along a direction gradually approaching the air vent.
8. A terminal device, characterized in that, The terminal equipment is applied to a laser selective melting and forming system with laser additive manufacturing equipment, and includes: The processing module is provided with a storage medium for storing the additive manufacturing method for improving the forming quality of overhanging surfaces as described in any one of claims 1-7; A communication module, connected to the processing module, is used for communication with the molding equipment.