WO2024239787A1 - 一种基于高、低温双材料空间分布的打印方法 - Google Patents

一种基于高、低温双材料空间分布的打印方法 Download PDF

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WO2024239787A1
WO2024239787A1 PCT/CN2024/083443 CN2024083443W WO2024239787A1 WO 2024239787 A1 WO2024239787 A1 WO 2024239787A1 CN 2024083443 W CN2024083443 W CN 2024083443W WO 2024239787 A1 WO2024239787 A1 WO 2024239787A1
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temperature
low temperature
layer
high temperature
resin
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French (fr)
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陈意伟
单忠德
宋亚星
范聪泽
郑菁桦
宋文哲
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B29C64/118—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials

Definitions

  • the present invention belongs to the technical field of high-end equipment manufacturing; in particular, it relates to a printing method based on the spatial distribution of high and low temperature dual materials.
  • the continuous fiber layer is obtained based on the longitudinal equal slices of the target part, and the printing path planning of the continuous fiber pre-impregnated filament part and the resin filament part is based on the fixed in-plane distribution rules.
  • This method takes the printing layer as a variable path arrangement object, and the continuous fiber arrangement in the continuous fiber layer is fixed, such as the typical stacking arrangement of continuous fiber layers and short fiber reinforced resin layers to form a sandwich structure.
  • Resins with similar properties are usually the same resin, such as PLA filaments and continuous carbon fiber reinforced PLA prepreg filaments.
  • the continuous fiber dual-nozzle printing solution that is, the use of resin or short fiber reinforced resin filaments and continuous fiber prepreg filaments for composite printing
  • the addition of resin or short fiber reinforced resin filaments makes the parts have adjustable stiffness and better energy absorption characteristics.
  • it also introduces new pore defects, which leads to the degradation of interlaminar shear performance.
  • the industry usually uses heat treatment to bridge the pores of the parts, improve the interface bonding state, and reduce the adverse effects of adding resin or short fiber reinforced resin filaments.
  • the present invention discloses a high and low temperature dual material space separation method.
  • the purpose of the printing method of the cloth is to provide a continuous fiber dual-nozzle printing space path generation solution, so that the continuous fiber pre-impregnated wire is three-dimensionally covered by the resin or short fiber reinforced resin wire in the spatial distribution.
  • the low-temperature resin is directional heat-treated in the form of the heat treatment effect, and the performance of the part is enhanced without affecting the overall accuracy of the part.
  • the present invention provides the following solutions:
  • a printing method based on the spatial distribution of high and low temperature dual materials includes a continuous fiber dual nozzle printing spatial path generation scheme as follows:
  • Step 1 Set the print width w, print layer thickness t, print wall thickness l, and fill unit type
  • Step 2 Slice the target part horizontally with the printing layer thickness t, extract the contour shape information set ⁇ Ci ⁇ of each layer, the indented wall thickness l of each layer, obtain the filling domain information set ⁇ Ri ⁇ of each layer, divide the filling domain ⁇ Ri ⁇ of each layer with the width w, and finally divide each slice layer into a geometric set ⁇ Mi ⁇ consisting of a zigzag wall and a number of rectangular filling strips, where the set consisting of all rectangular filling strips of each layer is the filling body ⁇ Si ⁇ ;
  • Step 3 Fill the filling body ⁇ Si ⁇ with the selected unit body type from top to bottom and from left to right;
  • Step 4 The center line of each geometric shape in the extracted geometry set ⁇ Mi ⁇ is a section of the printing path.
  • the connection order of the printing paths is as follows: a single layer is connected from the outer wall path to the filling domain path, where the filling domain path is connected from left to right.
  • the single-layer printing paths are connected from the bottom layer to the top layer to form the overall printing path of the target part.
  • Step 5 The outer wall path is marked as resin or short fiber reinforced resin material; the resin or short fiber reinforced resin filament and continuous fiber prepreg filament parts in the unit body in step 3 are marked in their respective printing paths; the path corresponding to the part of the unit body that cannot fill the filling body ⁇ Si ⁇ in step 3 is marked as resin or short fiber reinforced resin material; the marking of all printing path materials is completed, that is, the print head marking corresponding to each section of the printing path is completed.
  • the resin or short fiber reinforced resin material is a high temperature resin
  • the resin matrix of the continuous fiber prepreg wire is a low temperature resin
  • the thermal decomposition temperature of the low temperature resin should be higher than the melting point of the high temperature resin.
  • the selection of the above materials can construct an overall framework of the part composed of high temperature resin, and the continuous fiber prepreg wire is evenly coated.
  • the low temperature resin of the continuous fiber prepreg wire is subjected to directional heat treatment, which can fill the pores in the part and improve the continuous fiber impregnation degree without affecting the final forming accuracy of the part.
  • the filling unit body set in the continuous fiber dual-nozzle printing space path generation scheme is a rectangular structure composed of the rectangular filling strips described in step 2, each rectangular filling strip is marked with a corresponding material, and the unit body has three design structures according to the different distributions of the resin or short fiber reinforced resin filament and the continuous fiber prepreg filament:
  • the first layer low temperature, high temperature, low temperature,
  • the second layer high temperature, low temperature, high temperature
  • the third layer low temperature, high temperature, low temperature
  • the spatial distribution ratio of high/low temperature materials in the corresponding unit body is 4:5;
  • the first layer low temperature, high temperature, high temperature, low temperature,
  • the second layer high temperature, low temperature, low temperature, high temperature,
  • the third layer high temperature, low temperature, low temperature, high temperature,
  • the fourth layer low temperature, high temperature, high temperature, low temperature
  • the spatial distribution ratio of high/low temperature materials in the corresponding unit body is 5:5;
  • First layer low temperature, high temperature, high temperature, high temperature, low temperature,
  • the second layer high temperature, low temperature, low temperature, low temperature, high temperature,
  • the third layer high temperature, low temperature, high temperature, low temperature, high temperature, and
  • the fourth layer high temperature, low temperature, low temperature, low temperature, high temperature,
  • the spatial distribution ratio of high/low temperature materials in the corresponding unit body is 13:12;
  • the above three design unit structures can all achieve that the continuous fiber preimpregnated wire part in the component is three-dimensionally and evenly covered by the resin or short fiber reinforced resin wire part in spatial distribution, that is, the spatial distribution of high/low temperature materials accounts for 50%, but the applicability to the shape and size of the component decreases successively.
  • the heat treatment temperature range of the sample is set between the low-temperature resin melting point and the high-temperature resin melting point, and the heating time is determined according to the size of the formed sample, and the heating time is at least 3 hours.
  • FIG1 is a schematic diagram of three design structural unit bodies involved in the continuous fiber dual-nozzle printing spatial path generation scheme in the present invention: (a) 3 ⁇ 3 unit body, (b) 4 ⁇ 4 unit body, and (c) 5 ⁇ 5 unit body.
  • FIG. 2 is a schematic diagram of geometrically dividing the slices in step 2 of the continuous fiber dual-nozzle printing space path generation solution of the present invention.
  • FIG3 is a schematic diagram of the filling body ⁇ Si ⁇ in step 2 of the continuous fiber dual-nozzle printing space path generation scheme of the present invention.
  • FIG. 4 is a schematic diagram of step 4 of the continuous fiber dual-nozzle printing spatial path generation scheme in the present invention.
  • FIG. 5 is a schematic diagram of step 5 of the continuous fiber dual-nozzle printing spatial path generation solution in the present invention.
  • the target part is a cube of 9 ⁇ 5 ⁇ 2.25mm.
  • the high-temperature material used is short carbon fiber reinforced PA66 (nylon 66) composite wire, and the low-temperature material is continuous carbon fiber reinforced HIPS (impact-grade polystyrene) pre-impregnated wire.
  • Step 3 Fill the filling body ⁇ Si ⁇ with the selected unit body type from top to bottom and from left to right;
  • Step 4 The center line of each geometric shape in the extracted geometry set ⁇ Mi ⁇ is a section of the printing path.
  • the connection order of the printing paths is: a single layer is connected from the outer wall path to the filling domain path, where the filling domain path is connected from left to right.
  • the single-layer printing paths are connected from the bottom layer to the top layer to form the overall printing path of the target part, as shown in Figure 4;
  • Step 5 Outer wall path marked with short carbon fiber reinforced HIPS (impact-grade polystyrene) Material; the short carbon fiber reinforced PA66 (nylon 66) part and the continuous carbon fiber reinforced HIPS (impact-resistant polystyrene) pre-impregnated filament part in the unit body in step 3 are marked in their respective printing paths respectively; the path corresponding to the part of the unit body that cannot fill the filler ⁇ Si ⁇ in step 3 is marked as short carbon fiber reinforced PA66 (nylon 66) material; the marking of all printing path materials is completed, that is, the print head marking corresponding to each section of the printing path is completed, as shown in Figure 5.
  • HIPS impact-grade polystyrene
  • the workpiece is heat treated, and the parameters are set as a heating temperature of 210° C. and a heating time of 3 hours.
  • the technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

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  • Optics & Photonics (AREA)
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Abstract

本发明提供一种基于高、低温双材料空间分布的打印方法，通过填充单元体类型的设定，使得制件中连续纤维预浸渍丝材部分在空间分布上被树脂或短纤增强树脂丝材部分立体包覆，实现打印制件刚度、能量吸收性的性能均匀性调控；同时协同打印高、低温树脂材料，形成制件的高温树脂框架，并对打印制件中的低温树脂材质定向热处理，可实现在不影响制件最终成形精度的情况下，弥合制件内孔隙，优化界面结合效果，改善连续纤维浸渍程度，提升力学性能。

Description

一种基于高、低温双材料空间分布的打印方法 技术领域
本发明属于高端装备制造技术领域；尤其涉及一种基于高、低温双材料空间分布的打印方法。
背景技术
近年来随着连续纤维增强热塑性树脂基复合材料增材制造技术的发展，国内外已有若干研究团队推出系列成形设备，如中国斐帛科技公司的COMBOT-1、美国Markforged公司的Mark2、俄罗斯Anisoprint公司的Composer A4等。市场设备中也不乏双喷头打印设备，并已实现多材料的打印(一个打印头打印树脂或短纤增强树脂丝材，另一个打印连续干纤维或连续纤维预浸丝材)，其中树脂或短纤增强树脂丝材用于①支撑结构打印，②覆盖连续纤维打印层以提升最终制件表面质量。
现有连续纤维双喷头打印方案的打印路径和材料使用上有如下特点：
①连续纤维层基于目标制件纵向等分切片获得，连续纤维预浸渍丝材部分与树脂丝材部分基于固定的面内分布规则进行打印路径规划，该方式是以打印层作为可变的路径排布对象，连续纤维层内的连续纤维排布方式固定，如典型的连续纤维层与短纤增强树脂层的堆叠排布，形成的夹层结构。
②树脂或短纤增强树脂丝材和连续纤维预浸丝材所用树脂为温 度特性接近的树脂，通常为相同的树脂，如PLA丝材与连续碳纤维增强PLA预浸渍丝材搭配使用。
学术研究表明，连续纤维双喷头打印方案，即采用树脂或短纤增强树脂丝材与连续纤维预浸丝材复合打印，相较单一纤维复合材料丝材打印制件，树脂或短纤增强树脂丝材的加入，使制件具有可调节刚度和更好的能量吸收特性。但同时也引入了新的孔隙缺陷，进而导致层间剪切性能的退化。为此业内通常采用热处理的方式来期望弥合制件的孔隙，以改善界面结合状态，减少树脂或短纤增强树脂丝材加入的不利影响。
受限于上述现有连续纤维双喷头打印方案的打印路径和材料使用的特点，存在以下成形局限：
①在打印路径中，较难实现连续纤维预浸渍丝材在空间分布上被树脂或短纤增强树脂丝材立体包覆，即不便于在制件纵向切面上均布连续纤维预浸渍丝材和树脂或短纤增强树脂丝材路径，从而难以充分释放短纤增强树脂部分在成形制件刚度调节和能量吸收特性的有益作用。
②在热处理时，考虑树脂基体的温度特性会导致制件受热变形，降低制件整体的精度，因此热处理温度较低，孔隙弥合的效果不达预期。
发明内容
为解决上述问题，本发明公开了一种基于高、低温双材料空间分 布的打印方法，目的是提供一种连续纤维双喷头打印空间路径生成方案，实现制件以连续纤维预浸渍丝材在空间分布上被树脂或短纤增强树脂丝材立体包覆的形式成形。并基于此通过采用高温树脂或短纤增强高温树脂丝材与连续纤维预浸渍低温树脂丝材协同打印，通过对定向热处理低温树脂的形式，在不影响制件整体精度的前提下，提升热处理效果，强化制件性能。
为实现上述目的，本发明提供了如下方案：
一种基于高、低温双材料空间分布的打印方法，包括的连续纤维双喷头打印空间路径生成方案为：
步骤1：设定打印宽度w、打印层厚t、打印壁厚l、填充单元体类型；
步骤2：以打印层厚t对目标制件进行水平切片，提取各层轮廓形状信息集{Ci}，各层轮廓内缩壁厚l，获得对应各层的填充域信息集{Ri}，以宽度w分割各层填充域{Ri}，最终将各切片层统一切分为由回形壁和若干矩形填充条构成的几何集{Mi}，其中各层所有矩形填充条构成的集合为填充体{Si}；
步骤3：以选定的单元体类型对填充体{Si}以从上至下，从左至右的顺序进行填充；
步骤4：提取几何集{Mi}中的各几何形状的中心线均为一节打印路径，打印路径连接顺序为：单层是由外壁路径链接到填充域路径，其中填充域路径为由左至右顺序连接，将单层打印路径由底层至顶层顺序连接，形成目标制件整体打印路径；
步骤5：外壁路径标记为树脂或短纤增强树脂材质；步骤3中单元体中树脂或短纤增强树脂丝材和连续纤维预浸丝材部分分别标记到各自的打印路径中；步骤3中单元体无法对填充体{Si}填充的部分所对应的路径，标记为树脂或短纤增强树脂材质；至此完成所有打印路径材料的标记，即完成各节打印路径对应的打印头标记。
进一步的，所述的树脂或短纤增强树脂材质为高温树脂，连续纤维预浸丝材的树脂基体为低温树脂，且低温树脂热分解温度应高于高温树脂熔点。上述材材料的选择，可构建出由高温树脂构成的制件整体框架，并将连续纤维预浸渍丝材均匀包覆，在后处理中对连续纤维预浸渍丝材的低温树脂进行定向热处理，即可在不影响制件最终成形精度的情况下，弥合制件内孔隙，并提升连续纤维浸渍程度。
进一步的，所述的连续纤维双喷头打印空间路径生成方案中设定的填充单元体由步骤2所述的矩形填充条组成的矩形结构，每个矩形填充条标记有对应的材质，依据树脂或短纤增强树脂丝材和连续纤维预浸丝材分布的不同，单元体有三种设计结构：
①3×3单元体
第一层：低温、高温、低温，
第二层：高温、低温、高温，
第三层：低温、高温、低温；
对应的单元体中高/低温材料空间分布配比为4：5；
②4×4单元体
第一层：低温、高温、高温、低温，
第二层：高温、低温、低温、高温，
第三层：高温、低温、低温、高温，
第四层：低温、高温、高温、低温；
对应的单元体中高/低温材料空间分布配比为5：5；
③5×5单元体
第一层：低温、高温、高温、高温、低温，
第二层：高温、低温、低温、低温、高温，
第三层：高温、低温、高温、低温、高温，
第四层：高温、低温、低温、低温、高温，
第五层：低温、高温、高温、高温、低温。
对应的单元体中高/低温材料空间分布配比为13：12；
上述三种设计单元体结构均可实现制件中连续纤维预浸渍丝材部分在空间分布上被树脂或短纤增强树脂丝材部分立体均匀包覆，即高/低温材料空间分布占比为50％，但对于制件形状及大小的适用性依次减弱。
进一步的，打印完成后，对样件热处理温度范围设置在低温树脂熔点至高温树脂熔点之间，根据成形样件尺寸确定加热时间，加热时间至少为3小时。
本发明的有益效果如下：
(1)提供一种连续纤维双喷头打印空间路径生成方案，通过填充单元体类型的设定，使得制件中连续纤维预浸渍丝材部分在空间分布上被树脂或短纤增强树脂丝材部分立体包覆，实现打印制件刚度、 能量吸收性的性能均匀性调控；
(2)基于所提供一种连续纤维双喷头打印空间路径生成方案，协同打印高、低温树脂材料，形成制件的高温树脂框架，通过对打印制件中的低温树脂材质定向热处理，可实现在不影响制件最终成形精度的情况下，弥合制件内孔隙，优化界面结合效果，改善连续纤维浸渍程度，提升力学性能。
附图说明
图1为本发明中连续纤维双喷头打印空间路径生成方案涉及的三种设计结构单元体示意图：(a)3×3单元体，(b)4×4单元体，(c)5×5单元体。
图2为本发明中连续纤维双喷头打印空间路径生成方案步骤2里对切片进行几何切分的示意图。
图3为本发明中连续纤维双喷头打印空间路径生成方案步骤2里填充体{Si}的示意图。
图4为本发明中连续纤维双喷头打印空间路径生成方案步骤4的示意图。
图5为本发明中连续纤维双喷头打印空间路径生成方案步骤5的示意图。
具体实施方式
下面结合附图和具体实施方式，进一步阐明本发明，应理解下述 具体实施方式仅用于说明本发明而不用于限制本发明的范围。需要说明的是，下面描述中使用的词语“前”、“后”、“左”、“右”、“上”和“下”指的是附图中的方向，词语“内”和“外”分别指的是朝向或远离特定部件几何中心的方向。
目标制件为9×5×2.25mm的立方体，使用高温材料为短碳纤维增强PA66(尼龙66)复合材料丝材，低温材料为连续碳纤维增强HIPS(抗冲击级聚苯乙烯)预浸渍丝材。
本实施例采用连续纤维双喷头打印空间路径生成方案为：
步骤1：设定打印宽度w＝1mm、打印层厚t＝0.25mm、打印壁厚l＝1mm、填充单元体类型选择3×3单元体，如图1(a)；
步骤2：以打印层厚t＝0.25mm对目标制件进行水平切片，提取各层轮廓形状信息集{Ci}，各层轮廓内缩壁厚l＝1mm、，获得对应各层的填充域信息集{Ri}，以宽度w＝1mm分割各层填充域{Ri}，最终将各切片层统一切分为由回形壁和若干矩形填充条构成的几何集{Mi}，其中各层所有矩形填充条构成的集合为填充体{Si}，如图2-3；
步骤3：以选定的单元体类型对填充体{Si}以从上至下，从左至右的顺序进行填充；
步骤4：提取几何集{Mi}中的各几何形状的中心线均为一节打印路径，打印路径连接顺序为：单层是由外壁路径链接到填充域路径，其中填充域路径为由左至右顺序连接，将单层打印路径由底层至顶层顺序连接，形成目标制件整体打印路径，如图4；
步骤5：外壁路径标记为短碳纤维增强HIPS(抗冲击级聚苯乙烯) 材质；步骤3中单元体中短碳纤维增强PA66(尼龙66)部分和连续碳纤维增强HIPS(抗冲击级聚苯乙烯)预浸渍丝材部分分别标记到各自的打印路径中；步骤3中单元体无法对填充体{Si}填充的部分所对应的路径，标记为短碳纤维增强PA66(尼龙66)材质；至此完成所有打印路径材料的标记，即完成各节打印路径对应的打印头标记，如图5。
依据上述打印方案打印完成后，对制件进行热处理，参数设定为加热温度210℃，加热时间为3小时。
本发明方案所公开的技术手段不仅限于上述实施方式所公开的技术手段，还包括由以上技术特征任意组合所组成的技术方案。

Claims (4)

  1. 一种基于高、低温双材料空间分布的打印方法，其特征在于，采用的连续纤维双喷头打印空间路径生成步骤为：
    步骤1：设定打印宽度w、打印层厚t、打印壁厚l、填充单元体类型；
    步骤2：以打印层厚t对目标制件进行水平切片，提取各层轮廓形状信息集{Ci}，各层轮廓内缩壁厚l，获得对应各层的填充域信息集{Ri}，以宽度w分割各层填充域{Ri}，最终将各切片层统一切分为由回形壁和若干矩形填充条构成的几何集{Mi}，其中各层所有矩形填充条构成的集合为填充体{Si}；
    步骤3：以选定的单元体类型对填充体{Si}以从上至下，从左至右的顺序进行填充；
    步骤4：提取几何集{Mi}中的各几何形状的中心线均为一节打印路径，打印路径连接顺序为：单层是由外壁路径链接到填充域路径，其中填充域路径为由左至右顺序连接，将单层打印路径由底层至顶层顺序连接，形成目标制件整体打印路径；
    步骤5：外壁路径标记为树脂或短纤增强树脂材质；步骤3中单元体中树脂或短纤增强树脂丝材和连续纤维预浸丝材部分分别标记到各自的打印路径中；步骤3中单元体无法对填充体{Si}填充的部分所对应的路径，标记为树脂或短纤增强树脂材质；至此完成所有打印路径材料的标记，即完成各节打印路径对应的打印头标记。
  2. 根据权利要求1所述的一种基于高、低温双材料空间分布的打印 方法，其特征在于，采用的树脂或短纤增强树脂材质为高温树脂，连续纤维预浸丝材的树脂基体为低温树脂，且低温树脂热分解温度应高于高温树脂熔点。
  3. 根据权利要求1所述的一种基于高、低温双材料空间分布的打印方法，其特征在于，采用的连续纤维双喷头打印空间路径生成方案中所设定的填充单元体由步骤2所述的矩形填充条组成的矩形结构，每个矩形填充条标记有对应的材质，依据树脂或短纤增强树脂丝材和连续纤维预浸丝材分布的不同，单元体有三种设计结构：
    ①3×3单元体
    第一层：低温、高温、低温，
    第二层：高温、低温、高温，
    第三层：低温、高温、低温；
    ②4×4单元体
    第一层：低温、高温、高温、低温，
    第二层：高温、低温、低温、高温，
    第三层：高温、低温、低温、高温，
    第四层：低温、高温、高温、低温；
    ③5×5单元体
    第一层：低温、高温、高温、高温、低温，
    第二层：高温、低温、低温、低温、高温，
    第三层：高温、低温、高温、低温、高温，
    第四层：高温、低温、低温、低温、高温，
    第五层：低温、高温、高温、高温、低温。
  4. 根据权利要求1所述的一种基于高、低温双材料空间分布的打印方法，其特征在于，打印完成后，对样件热处理温度范围设置在低温树脂熔点至低高温树脂熔点之间。
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