CN106132671B - 具有气候控制处理的用于3d打印的方法和设备 - Google Patents

具有气候控制处理的用于3d打印的方法和设备 Download PDF

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CN106132671B
CN106132671B CN201580017434.5A CN201580017434A CN106132671B CN 106132671 B CN106132671 B CN 106132671B CN 201580017434 A CN201580017434 A CN 201580017434A CN 106132671 B CN106132671 B CN 106132671B
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D·冈瑟
J·冈瑟
I·格努奇特尔
M·拉索
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Abstract

一种用于生产3D部件(103)的方法,其中,逐层地,颗粒材料被涂覆到封闭的构建室中的构建平台(102)并且选择性地打印液体被涂覆,并且这些步骤被重复直到获得三维部件(103),构建室中的大气中的相对空气湿度或相对溶剂部分被设定为选定值和/或构建室内的温度被设定为选定温度。

Description

具有气候控制处理的用于3D打印的方法和设备
技术领域
本发明涉及一种用于借助于可设定的方法参数生产三维模型的方法和设备。
背景技术
在欧洲专利说明书EP 0 431 924 B1中描述了一种用于从计算机数据生产三维物体的方法。在该方法中,将颗粒材料以薄层涂覆到平台,并且使用打印头将粘合剂材料选择性地打印到颗粒材料上。粘合剂被打印到其上的颗粒区域粘在一起并且在粘合剂、并且附加硬化剂(如有必要的话)的影响下固化。平台然后降低一层厚度的距离到构建圆柱中并且涂覆有新的一层颗粒材料,该新的一层颗粒材料也如上所述被打印。这些步骤被重复直到实现某一期望高度的物体。三维物体(也称为成型零件或模型)由此从打印且固化的区域产生。
在该物体完成之后,从固化颗粒材料产生的该物体嵌在松散的颗粒材料中并且随后从该颗粒材料中被移除。这例如使用提取器来完成。这留下了期望的物体,例如通过手动刷洗从该物体移除粉末沉积物。该方法可以用来处理不同的颗粒材料,包括天然生物原材料、聚合物、金属、陶瓷和砂土(非详尽列表)。
例如,颗粒材料中的固体可以用作粘合体系。该固体借助于从喷墨打印头喷出的溶剂来溶解。在溶剂蒸发之后,颗粒在期望的位置粘在一起。在一定的等待时期之后从剩余的松散粉末移除部件。
除了别的以外,粉末状水玻璃(硅酸钠)也可以用作粘合体系。该材料通过打印水基流体被溶解。取决于数量,该液体水玻璃现在在颗粒之间沉淀。硬化借助于各种机制进行。然而,主要使用干燥粘合液体。水玻璃物理硬化。颗粒材料、粘合剂和流体的其他组合也是本领域技术人员所公知的。在该类型的3D打印处理中干燥或蒸发流体还导致成型零件的固化和成形。
该处理执行在硬化处理或者液体的干燥或蒸发期间是有问题的。该类型的3D打印处理常常导致具有不足的强度和极端的几何偏差的部件。
在已知的3D打印方法中,一方面,处理参数改变,并且另一方面,材料体系变化以适于增大强度和改善表面质量的目的。
WO 2012/175072 A1描述了例如用于使用各种集料控制在部件上的沉积物的方法。例如,可以使用吸收过量的水的水泥。水玻璃含量也可以增加。
两种方法都具有某些缺点。水泥吸收一定量的水分并且在一定程度上充当过早干燥处理。这对强度是不利的。
增加水玻璃含量以便正向影响表面质量也是有用的。然而,能被添加的量在技术上被限制,并且该方法的经济可行性也受到负面影响。
发明内容
因此本发明的目的是减轻已知3D方法的缺点或者完全避免它们。具体地,本发明的一个目的是增大由此生产的成型零件的强度,同时维持良好的尺寸精度和/或减少该类型的部件的前述性质的变化。
该目的通过用于生产3D部件的方法来实现,将颗粒材料按层涂覆到封闭的构建空间中的构建平台并且选择性地涂覆打印液体,并且重复这些步骤直到获得三维部件,构建空间中大气中的相对湿度或相对溶剂浓度设定为选定值,和/或构建空间中的温度设定为选定温度。
在另一方面,目的的实现涉及适于3D打印方法的设备,包括:
a.封闭的构建空间;
b.用于设定大气中的相对湿度或相对溶剂浓度的装置;和/或
c.用于控制构建空间内部的温度的装置。
原则上,本发明的目的因为水或流体溶液和干燥或蒸发受湿度或溶剂的针对性引导控制而实现。由此实现有利的硬化发展,并且获得具有期望的且可调节的强度的部件。
发明人已经开发了有利的方法,借助于该方法可以生产具有水基或其他液体基材料的成型零件,该成型零件具有有利的强度和令人满意的表面质量。
下面更详细地说明本发明中的大量术语。
在本发明的意义内,“3D打印方法”是从现有技术已知的所有方法,其有利于三维模型中部件的构造并且与所述处理部件和设备相兼容。具体地,它们是基于粉末的方法,包含作为一种组分、必须从成型零件去除的或者在成型零件固化期间或者为了其固化从待生产的成型零件逸出的水溶液和/或其他流体成分或溶剂。成型零件的固化和质量可以针对性方式受本发明的影响,其他质量特征保持不变或者甚至被正向影响。
“打印液体”被理解为基本上是借助于喷墨设备可打印的水或流体状液体。打印液体可以是材料混合物,其包括水和其他影响例如粘度和表面张力的添加剂。用于防止真菌和植物性物质生长的化学剂也可以被包含在打印液体中。尤其,打印液体也可以包含可粘合材料,其导致干燥之后填料中一定的粘合效果。
对于基于粉末的3D打印已知的所有材料,具体为砂土、陶瓷粉末、金属粉末、塑料、木材颗粒、纤维材料、纤维素和/或乳糖粉末,可以用作“填料”。填料优选地是干燥的、自由流动的粉末,尽管黏着的、牢固的粉末也可以被使用。
在本发明的意义内,“选择性粘合剂涂覆”或“选择性粘合剂体系涂覆”或“粘合剂液体涂覆”或“粘合剂液体的涂覆”可以在每次颗粒材料涂覆之后或无规律地进行,取决于成型体的要求并且为了在每次颗粒材料涂覆之后最优化成型体的生产、即非线性地并且非平行地的目的。“选择性粘合剂涂覆”或“选择性粘合剂体系涂覆”因此可以单独地并且在生产成型体的过程期间设置。
“粘合剂体系”被理解为材料体系,其能够粘合颗粒材料。粘合剂体系包括至少一种待打印的“粘合剂液体”和可能的其他液体或固体成分,该其他液体或固体成分可以存在于粘合剂液体以及颗粒材料中。粘合剂体系可以化学地或物理地或者借助于化学和物理处理的组合粘合。粘合动作可以通过添加例如呈热或光的形式的能量被触发或加速。通常关于此点本领域技术人员已知的所有材料体系可以被认为是粘合剂体系。例如,粘合剂体系可以包括“粘合剂液体”和固体“粘合剂”,其被包含在颗粒材料(构建材料)中并且可溶解在粘合剂流体中。在该情况下,固体由溶剂溶解,其从喷墨打印头喷出并且涂覆到颗粒材料。在粘合剂液体的基本蒸发或干燥之后,构建材料的选择性打印区域被粘合在一起。选择性固化同样可以借助于本领域技术人员已知的化学体系在粘合剂液体和/或颗粒材料中产生。
“粘合剂”被理解为粉末状成分,其基本上在打印液体中可溶解并且在溶解状态下引起粘合动作,特别是如果粘合剂在填料中。例如,水玻璃以及水泥粘合剂适于作为粘合剂。
在本发明的意义内“成型体”、“模型”、“3D成型零件”或“部件”都是三维物体,其借助于根据本发明的方法和/或根据本发明的设备生产并且具有非可变形性。
包含必要部件的任何已知3D打印设备可以被用作用于执行根据本发明的方法的“设备”。常用部件包括涂布机、构建面板(Baufeld)、用于移动构建面板或其他部件的装置、定量给料装置、打印头、加热装置、用于批处理或连续处理的定位装置以及其他本领域技术人员已知并且因此不需要在这里更详细列举的部件。
用于基于粉末的3D打印的已知的所有材料--具体为砂土、陶瓷粉末、金属粉末、塑料、木材颗粒、纤维材料、纤维素和/或乳糖粉末可以用作“颗粒材料”或用作“构建材料”。该颗粒材料优选地是干燥的、自由流动的粉末,尽管黏着的、牢固粉末也可以被使用。
在本发明的意义内“构建空间”是几何位置,其中颗粒材料给料在构建处理期间通过用颗粒材料重复涂布而增长。构建空间通常由基部、构建平台、由壁和敞开覆盖表面、构建平面划界。构建平面可以是水平的但也可以例如在连续方法中形成角度,使得层涂覆成一个角度倾斜地进行。
在本发明的意义内“构建容器”实施为构建空间。因此它具有基部、壁和敞开进入区域、构建平面。构建容器始终包括相对于3D打印设备的框架不移动的零件。可移除的构建容器、所谓的工作盒使得可以差不多连续地操作机器,因为工作盒可以被插入机器或从机器移除。因此第一次构建操作中的零件可以在3D打印设备外部拆封,而新的零件可以在第二构建容器中在机器内被打印。
根据本发明,“打印和涂布机平面”是进展中当前构建处理的位置的抽象概念。因为定量给料单元和涂布机在几乎一个高度处在具有共享部件的定位单元上在设备中结构上被移动,“打印和涂布平面”在本说明书中被看作位于新近涂覆的层的上边缘处。它可以形成水平平面或成一角度设置。
根据本发明,“构建平台”相对于打印和涂布机平面移动。该相对移动在构建处理期间在层厚度中以间断移动进行。它限定了层厚度。
“容器壁”或“壁”是指对颗粒材料的屏障。颗粒材料不能从壁的一侧行进到另一侧。
在该公布中,“密封件”是指两个结构元件,这两个结构元件防止颗粒材料穿过壁之间的接触点通过,从而相对于彼此或在壁和构建平台之间移动。
“几何部件限制”是指构建材料中部件的抽象概念。在构建处理期间生产的零件由于构建材料颗粒的离散性质偏离几何部件限制。
“保持系统”位于通风系统和颗粒材料给料之间的界面处。该保持系统的功能是捕捉气流中存在的颗粒。该保持系统可以被设计为筛网或多孔体。3D打印体也可以用作保持系统。不论它们是否已被完全干燥,3D打印体是非物质的。该类型的体也可以通过构建处理来生产。
在本发明的范围内“受控气流”是气流,其以限定方式被传导通过构建材料,或者在任何情况下,被有目的地从外部引入所涂覆的构建材料并且流过所涂覆的构建材料,用于更快速地去除溶剂蒸汽(粘合剂液体蒸汽)的目的。这减少了或基本上干燥了所涂覆的构建材料中的粘合剂液体。“受控气流”可以是简单的环境空气,其优选地被温度控制,优选地被加热,或者它可以是限定的气体混合物。
“受控气流”或“受控气体流动”也可以被称为“强制通风”并且在一个具体实施例为受控气流。构建材料中的自由对流在某种意义上与强制通风相反。在该情况下,由于浓度梯度,蒸汽可以仅通过扩散被去除。在强制通风的情况下,蒸汽、即溶剂蒸汽或粘合剂液体蒸汽受气流控制并且选择性地移动或者从构建材料被去除。
“温度控制”或“气流的温度控制”是指被引入构建空间中的空气或气体混合物被设定为特定温度,或者构建空间被设定为选定温度。
根据本发明,“相对湿度”是指存在于、被引入或被传导通过构建空间的空气或气流具有设定为期望值的湿度。这可以不仅影响湿度而且影响相对溶剂含量。
关于粘合剂液体“减少的或基本上干燥的”是指与粘合剂液体的直接涂覆相比,在选择性涂覆期间粘合剂液体的数量被减少。粘合剂液体优选地被减少到这样的程度,即所生产的部件具有使其稳定到它可以容易地并且没有问题地拆封的程度的强度。“基本上干燥的”是指部件不会包含任何粘合剂液体或仅其剩余。根据本发明,“减少”或“干燥”粘合剂液体的处理借助于“受控气流”关于时间和粘合剂液体减少的数量被有利地加速和有目的地控制。
在本发明的意义内“逐层进行”是指在工作盒中或另一水平构建平面中将构建面板降低一个层厚或者将位于构建面板上方的设备零件升高一个层厚的处理。在连续方法中,“逐层进行”是指将所涂覆的构建材料(打印机器中的构建材料块)移动一个层厚,使得新的一层颗粒材料可以被涂覆并且因此层涂覆和选择性粘合剂液体涂覆可以连续进行。
在本发明的范围内“以时间受控方式流过”是指在该方法期间受控气流动在限定的时间点并且在限定的时段内执行,并且受控气流动在该方法期间规律或不规律地进行。
在该公布中“IR辐射”是指使用IR辐射器的构建面板的辐射。该发射器可以是静态的,或者可以借助于定位单元在构建面板上被移动。
“干燥”被理解为一定体积的水或另一流体物质的减少。该干燥由水分或另一流体物质到环境空气的释放引起。干燥动作可以与硬化结合。
“硬化”是用于增大部件的强度的术语。在水玻璃基体系中硬化可以通过干燥或化学硬化进行。
根据本发明,术语干燥和硬化不被理解为是同义的。
“溶解”被理解为是在打印液体中溶解或开始溶解粘合剂的处理。溶解处理取决于不同的因素,例如反应持续时间、温度、相对水量以及例如水玻璃的类型。
“在构建空间内设定气候条件”是指在构建空间中的大气中温度和/或相对湿度或相对溶剂浓度以这样一种方式被改变或选择并且以这样一种方式通过合适的装置被设定,即在待被生产的部件中干燥或硬化处理在期望的时间窗口内进行,并且因此实现有利的部件特性。
下面描述优选的特定实施方式。
在根据本发明的方法的一个优选的特定实施方式中,构建空间中的气候条件可以这样一种方式设定,即打印的粘合剂液体或挥发性组分的蒸发速率在待被生产的3D部件中是可控的。温度借助于合适的装置优选地设定为构建空间中合适的范围或特殊温度,和/或构建空间的大气富集有合适的剂,富集有从待被生产的3D成型零件蒸发的剂(水或另一挥发性物质,优选地在3D打印中使用的已知溶剂)的气流优选地被引入构建空间的大气中。蒸发速率因此可以有利地被控制。
在根据本发明的方法中,此外,打印的粘合剂液体或其挥发性组分的蒸发速率相对于室温(优选地21℃)和环境湿度的条件有利地被减小。减小或替代地增大优选地至少50%,优选地50%-90%,更优选地50%-70%,甚至更优选地60%-80%。
在另一优选特定实施方式中,相对湿度或相对溶剂浓度被设定为大于40%、优选地在50%和90%之间、更优选地在50%和80%之间、甚至更优选地在55%和70%之间的相对湿度或相对溶剂浓度的值。
此外如果构建空间中的温度被调节则可能是有利的。相同的温度可以在整个制造处理始终被保持,或者可以在生产过程期间被逐步改变。该温度优选地设定为从10℃到50℃、优选地从15℃到40℃、更优选地从30℃到35℃的值。
在构建空间中优选地施加定向气流,其优选地具有预定温度和/或预定相对湿度或相对溶剂浓度,如上所述。
原则上,根据本发明的方法可以与所有已知的3D打印方法和材料体系一起使用,并且展示由此获得的3D部件中的优点,其中材料体系包含水分或挥发性组分。颗粒材料优选地选自包括砂土、金属、聚合物、陶瓷、木材、纤维素、乳糖、盐、碳、硬质材料(WC)、玻璃、水泥和石膏的组。
在根据本发明的方法中,任何已知的流体物质也可以用作打印液体或粘合剂液体。打印液体优选地选自包括水、酒精、酯、醚、醋酸盐、酮、酰胺、醛、挥发油(Benzin)、丙烯酸盐、苯乙烯、环氧树脂、多元醇、异氰酸盐、酚醛清漆、甲阶酚醛树脂、聚酯、过氧化氢、琥珀酸盐、芳香烃、脂肪族化合物和碳氢化合物的组。
材料体系优选地用于根据本发明的方法中,该材料系统包括作为粉末状粘合剂的水溶性粘合剂和水不溶性颗粒以及颗粒材料中的水基粘合剂液体。
可以用于根据本发明的方法的设备已经在上进行了描述并且可以具有以下优选特征:
构建空间优选地是可紧紧密封的,由此可以更容易地且更不断地设定另一部件的温度和/或相对湿度或相对部分的调节。
本领域技术人员已知的装置可以用来调节温度并且设定构建空间中的相对湿度。用于设定相对湿度的装置可以优选地选自包括水基加湿器或溶剂蒸发器的组。
用于控制构建面板的温度的装置优选地选自包括空气加热单元或IR辐射单元的组。
此外根据本发明的设备可以包括用于控制构建空间内部中的一个或多个气流、优选地用于控制构建空间上一个或多个气流的装置。
用于控制构建空间内部中的一个或多个气流的装置可以选自管子、扩散器、喷嘴和/或挡板。
根据本发明的设备以这样的方式被设计,即它适于上述材料体系以及适于所述材料和它们的组合。
根据本发明的设备也可以优选地包括用于最小化或避免不期望的对流移动的隔热件。
附图说明
图1:作为剖面等距视图示出了基于粉末的3D打印机的部件的图示;
图2:示出了常规的3D打印处理的顺序的图解;
图3:示出了使用强制对流的干燥处理;
图4:示出了溶解处理的示例;
图5:示出了不同的粘结桥设计。
具体实施方式
下面说明其他优选特定实施方式。
基本部件对应于用于借助于喷墨打印技术成层构建模型的系统,如本领域技术人员已知的,并且因此在这里不需要非常详细地重复。
顺序优选地如下组织:一层颗粒材料涂覆到构建平台并且被弄平。打印液体然后根据3D模型的层数据打印到层上。用于粘合颗粒的材料的基本部分被提供在呈干燥颗粒的形式的粉末中。溶解处理现在可以通过利用IR灯的加热来加速。在打印和加热处理之后,构建平台被降低,并且处理再一次开始。
这些步骤被重复直到部件完全存在于构造的粉饼中。
以该方式生产的部件的质量基于不同的标准进行评价。例如,强度对于稍后在铸造中用作芯或模子非常重要。它决定操作部件的容易度或者芯是否将在铸造处理中幸存而没有破坏。
另一个基本变量是表面质量。在铸造应用期间,例如,打印的部件的表面在铸造零件上直接复制。尺寸精度也是重要的。仅尺寸精确的部件可以在剩余步骤中被处理成工业可用零件。
在所谓的水玻璃材料体系中,强度和表面性质彼此呈一定的相反关系,如测试已经证实。非常强的部件利用所述的程序容易实现。这些零件利用高比例的液体打印并且在处理之后具有差的表面。
也可以实现良好的表面。然而,部件因此非常脆弱并且仅可以困难地被操作或运送。
该矛盾由水玻璃花费时间溶解的情况引起。在该时间期间,打印的液体由于部件中的毛细管效应跨几何学上期望的形状的边界行进,并且在部件上产生不期望的沉淀。这些沉淀以渗斑的形式出现在部件壁上。如果溶解将更快发生,打印液体的粘度将在颗粒材料中更快速地增大,打印液体到相邻区域中的渗透将减少,并且因此将可实现更好的表面。
在根据现有技术的设备中,颗粒材料在被涂覆之后利用IR灯被加热以增大溶解速度。如在涉及干燥水玻璃的测试中所示,这引起打印液体的粘度快速增大,并且部件具有更好的表面。
不管该程序如何,一些颗粒材料(例如,一些砂土类型)利用该方法可能不被令人满意地处理。
涉及根据现有技术的设备的测试已经显示小股气流(Zugluft)可能对处理具有显著的负面影响。可能不能实现常规的强度。然而,表面看起来很好。
发明人现在已经确定这是由于液体变干太快。在该情况下,仅打印液体的小部分在溶解期间是活性的,并且导致不足的强度。
发明人现在已经开发了一种方法,其中从颗粒材料干燥打印液体借助于处理室中的附加湿度被减速。该温度可以优选地借助于IR灯或其他合适的装置来提高,并且甚至可以引起更多的材料溶解。受控的气流优选地被传导经过构建面板。
测试已经显示通过使用该类型的系统,与现有技术相比可以实现改善的强度。同时可以实现非常好的表面,尽管强度很高。
处理窗口通过结合用于加热液体的诸如IR灯的热源与潮湿大气的生成而借助于本发明被大大扩大。
借助于本发明,并且通过增大湿度,材料可以因此被处理,该材料以前不能使用或者仅具有降低质量的成型零件。这些材料包括细砂、具有不寻常的颗粒形状的砂土和具有高比重的特殊填料。
下面更详细地描述本发明。
根据本发明的系统极大地利用基于粉末的3D打印。机械工程被增大以满足根据本发明的要求。
根据本发明的设备包括粉末涂布机(101)。颗粒材料由此被涂覆到构建平台(102)并且被弄平滑(图2(a))。所涂覆的颗粒材料可以包括大范围的材料。例如,可以使用诸如砂土、人造砂和陶瓷颗粒的填料。这些材料的流动特性可以变化很大。不同的涂布机技术允许从干燥的、自由流动的粉末和黏着的、牢固粉末成层到基于液体的分散体。粉末层(107)的高度由构建平台(102)确定。该构建平台在一层已被涂覆之后被降低。在下一次涂布操作期间,所得到的容积被填充并且多余量被平滑。结果是限定高度的几乎完美的平行且平滑的层。
在涂布处理之后,打印液体借助于喷墨打印头(100)被打印到层上(图2(b))。打印图像对应于部件在设备的当前构建高度处的剖面。液体冲击并缓慢扩散到颗粒材料中。
在粘合剂被打印之后,层可以被加热(图2(c))。为此目的,IR辐射器(200)例如可以越过构建面板。该IR辐射器可以与涂布系统的轴线耦合。部分液体粘合剂在加热期间蒸发。
在该加热处理结束时,构建平台(102)降低一层厚度。现在重复层构造、打印、加热和降低的步骤直到完全生产出期望的部件(103)。
部件(103)现在完全存在于粉饼(602)中。取决于颗粒(303)的粘合所基于的物理或化学处理,部件现在差不多固化。部件通常紧接在打印之后处于软状态。
该状态不成问题,只要部件(103)保持在粉末(107)中,由周围的颗粒材料支撑。然而,一旦该部件从粉末拆封,由于重力和其他力效应,几何变形不可避免。
因此通常该部件被留在粉末中。不允许部件(103)固化的过量粘合剂(301)现在在未粘合的颗粒材料(303)中经由各种蒸汽通道(302)蒸发。在几何部件限制(305)中粘合的颗粒材料(304)的结合(Bindungen)越来越多地固化。在一定的等待时间之后,体(103)足够结实以能够被拆封。
利用具有水玻璃基粘合剂的根据本发明的材料体系,可以在打印之后相对快速地拆封零件。在该情况下,由于利用IR灯(200)的加热,必须维持小于2小时的等待时期。
固化处理如下进行:打印液体(400)冲击颗粒材料(304、401)并且由于毛细管作用渗透粉末。打印液体继续在近似为球体的空间(403)内越来越远地渗透。
在颗粒材料内,打印液体润湿被动填料颗粒(304)和水玻璃粒子(401)。水玻璃存在于细的离散颗粒(401)中,这些细的离散颗粒由于材料的强烈混合几乎均匀地分布。
润湿的水玻璃粒子(404)由于液体粘合剂逐渐开始溶解,在处理中失去直径(405)并且增加打印液体的粘度。在该阶段,液体量的散布速度减小。
在适合量的打印液体的情况下,在该阶段中润湿充足到填料颗粒之间的各个间隙经由打印液体(404)彼此接触的程度。整个水玻璃理想地溶解,并且产生均质液体(406)。
在下一个阶段中,通过在颗粒材料中存储部件从增厚的打印液体中去除水分。该液体由非常干燥的粉末环境吸收。
水分的去除确保液体继续变厚。该水分由于毛细管作用被吸回到填料颗粒之间的区域。它在这里继续变干,直到最后固体水玻璃桥(407)保持。颗粒(304)因此被粘合,并且固体主体被生产出。
虽然水玻璃粒子在大多数情况下被部分溶解,粘度的增加不足以防止流体的进一步散布。这导致部件上的沉淀物。通过增加较少的流体抵消该效应不是权宜的,因为不能形成足够的粘结桥(500)和不能够因此形成足够的强度。相反,该效应不能通过改变打印液体的量来抵消,因为相对于水玻璃的总量的水的协调量仅可以在完全溶解的状态下被合理的限定。在很少材料已被溶解的初始阶段中,过量的水始终存在。
因此合理的是增大溶解速度。借助于IR灯的加热在这里是有效的。水过量阶段现在比以前短得多。另一方面,对粘度的影响可以忽视。
然而,打印液体的蒸汽压力也通过加热增大。大量打印液体早在层的生成期间蒸发。同样,水分通过干燥的、周围粉末被迅速地从部件去除。加速的溶解处理由于打印液体的过大变厚而被太快地中止,并且在颗粒(500)之间出现不完全粘合。部分水玻璃仍在某些地方呈颗粒形式,这不会有助于部件(501、502)的强度。
该蒸发处理可以通过根据本发明调节构建空间中的湿度和温度来抵消。这是指,封闭构建空间内的空气被调节到18℃-40℃、优选地30℃-35℃的温度范围,并且然后相对湿度在40%-70%、优选地60%-70%的范围内被调节。温度和湿度例如可以借助于外部空调单元来调节,用于温度和湿度的相应传感器被容纳在处理室内。经由空调单元引导的处理空气然后应优选地经由相应的扩散器无小股气流地被吹入处理室。
由于环境空气中水的高分压,从颗粒材料的蒸发速率减小。另外,由于水玻璃颗粒具有高吸湿效应,颗粒材料被继续湿润。
该被防止的蒸发使得可以能够由于温度而快速溶解大量水玻璃。几乎理想的粘合(407)可以发生。强度和表面质量之间的比值比没有加湿的情况好得多,如测试显示的。
到目前为止,仅特定的砂土已适于与干燥的水玻璃粘合。例如,具有特定表面纹理的球状河砂是合适的。人造砂也可以被处理。两种材料生产昂贵并且因此不适于广泛使用。
宽泛得多的范围的颗粒材料现在可以使用根据本发明的方法被处理。这些包括Strobel GS 14和GS 09类型的砂土,这些砂土在没有根据本发明的方法的情况下利用可接受的表面供给太小的强度。在常规的打印方法中并且具有可接受的表面的情况下,这些砂土的挠曲强度小于90N/cm2。该强度对于部件的安全清洁和运输是不足的。利用根据本发明的加湿,并且在没有砂土配方的任何改变的情况下,相同的砂土可以实现290-300N/cm2的强度。
特别锐利边缘的、破碎的材料得益于该强度的增大。橄榄石砂的使用因此仅借助于该措施是可能的。
然而,该措施在特定成型材料的情况下同样有效。在该情况下,也可以实现显著的强度增大,这将应用范围扩大到越来越多的复杂形状。
根据本发明的设备基于根据现有技术的3D打印机。至少一个可移动的或静止的IR辐射源必须存在。
构建空间的空气调节超过现有技术。调节的加湿系统在这里必须被使用。水中加热元件可以用作水分源。在构建空间内测量的水分因此决定加热元件的功率。
湿空气例如经由风扇分布。在构建面板上的小股气流应被最小化。否则,太多的水将从新近打印的层被去除,尽管湿度很高。
湿空气经由管子或导流板被引导到构建面板附近。
该调节系统与机器的打印控制器的耦合是特别优选的。由喷墨打印头产生的液滴可以被包括在水分调节中。
将水分调节与温度调节结合也是优选的。粉末床中的温度因此可以借助于IR灯被更精确地控制。更好的可复制打印结果因此是可行的。
根据本发明的处理的优点可以用于所有材料混合物,在这些材料混合物中使用水基打印液体,用于选择性溶解基本上可水溶的粉末状粘合剂以借助于随后的干燥处理粘合周围填料的目的。本发明因此不限于水玻璃基粘合剂,而且例如被用于石膏基或水泥基粘合剂。
附图标记列表
100 打印头
101 涂布机
102 构建平台
103 部件
104 构建容器
105 打印头路径
106 涂布机路径
107 粉末层
108 构建平台移动的方向
109 定量给料的液滴
110 粉末辊
111 构建空间边界
112 涂布机间隙
113 涂布机原料(stock)
200 IR辐射器
300 敞开层中的蒸发材料
301 材料蒸发到粉末中
302 可能的蒸汽通道
303 未粘合的颗粒
304 粘合颗粒
305 几何部件限制
400 流体液滴
401 水玻璃颗粒
402 被动颗粒之间的间隙
403 流体的扩散方向
404 在水玻璃粒子之间具有连接的液体膜
405 通过溶解减小尺寸的水玻璃颗粒
406 变厚的溶液
407 固体粘合
500 弱的粘结桥
501 具有未包括在粘合中的水玻璃颗粒的桥
502 无效的干燥

Claims (28)

1.一种用于生产3D部件的方法,其中,颗粒材料按层被涂覆到封闭构建空间中的构建平台并且打印液体被选择性地涂覆,并且这些步骤被重复直到获得三维部件,其中,所述构建空间的大气中的相对湿度或相对溶剂浓度被设定为选定值,和/或所述构建空间中的温度被设定为选定温度,其中所述构建空间中的气候条件能以这样的方式被设定,使得打印的粘合剂液体或挥发性组分的蒸发速率在待被生产的所述3D部件中是可控制的;
其中所述打印的粘合剂液体或所述挥发性组分的蒸发速率相对于在室温和环境湿度的条件下被降低至少50%。
2.根据权利要求1所述的方法,其中所述打印的粘合剂液体或所述挥发性组分的蒸发速率相对于在室温和环境湿度的条件下被降低50%-90%。
3.根据权利要求1所述的方法,其中所述打印的粘合剂液体或所述挥发性组分的蒸发速率相对于在室温和环境湿度的条件下被降低50%-70%。
4.根据权利要求1所述的方法,其中所述打印的粘合剂液体或所述挥发性组分的蒸发速率相对于在室温和环境湿度的条件下被降低60%-80%。
5.根据权利要求1所述的方法,其中所述室温为21℃。
6.根据权利要求1至5中的任一项所述的方法,其中所述相对湿度或相对溶剂浓度被设定为在50%和80%之间。
7.根据权利要求1至5中的任一项所述的方法,其中所述相对湿度或相对溶剂浓度被设定为在55%和70%之间。
8.根据权利要求1至5中的任一项所述的方法,其中所述温度被设定为从10℃到50℃的值。
9.根据权利要求8所述的方法,其中所述温度被设置为从15℃到40℃的值。
10.根据权利要求8所述的方法,其中所述温度被设置为从30℃到35℃的值。
11.根据权利要求1至5中的任一项所述的方法,其中在将定向气流施加到所述构建空间中,所述气流具有预定温度和/或预定相对湿度。
12.根据权利要求1至5中的任一项所述的方法,其中所述颗粒材料选自包括砂土、金属、聚合物、陶瓷、木材、纤维素、乳糖、盐、碳、硬质材料(WC)、玻璃、水泥和石膏的组。
13.根据权利要求1至5中的任一项所述的方法,其中所述打印液体选自包括水、酒精、酯、醚、醋酸盐、酮、酰胺、醛、挥发油、丙烯酸盐、苯乙烯、环氧树脂、多元醇、异氰酸盐、酚醛清漆、甲阶酚醛树脂、聚酯、过氧化氢、琥珀酸盐、芳族化合物、脂肪族化合物和碳氢化合物的组。
14.根据权利要求1至5中的任一项所述的方法,其中材料体系被使用,所述材料体系包括作为粉末状粘合剂的水溶性粘合剂和水不溶性颗粒以及所述颗粒材料中的水基粘合剂液体。
15.一种适于3D打印方法的设备,包括:
a.封闭的构建空间;
b.用于设定空气中的相对湿度或溶剂浓度的装置;和/或
c.用于控制所述构建空间内部的温度的装置;
其中所述构建空间中的气候条件能以这样的方式被设定,使得打印的粘合剂液体或挥发性组分的蒸发速率在待被生产的所述3D部件中是可控制的;
其中所述打印的粘合剂液体或所述挥发性组分的蒸发速率相对于在室温和环境湿度的条件下被降低至少50%。
16.根据权利要求15所述的设备,其中所述打印的粘合剂液体或所述挥发性组分的蒸发速率相对于在室温和环境湿度的条件下被降低50%-90%。
17.根据权利要求15所述的设备,其中所述打印的粘合剂液体或所述挥发性组分的蒸发速率相对于在室温和环境湿度的条件下被降低50%-70%。
18.根据权利要求15所述的设备,其中所述打印的粘合剂液体或所述挥发性组分的蒸发速率相对于在室温和环境湿度的条件下被降低60%-80%。
19.根据权利要求15所述的设备,其中所述室温为21℃。
20.根据权利要求15至19中的任一项所述的设备,其中所述构建空间基本上可紧紧地密封。
21.根据权利要求20所述的设备,其中用于设定相对湿度的装置选自包括水基加湿器或溶剂蒸发器的组。
22.根据权利要求20所述的设备,其中用于控制所述构建空间内部的温度的装置选自包括空气加热单元或IR辐射单元的组。
23.根据权利要求20所述的设备,其中所述设备还包括用于控制所述构建空间内部的一个或多个气流的装置。
24.根据权利要求23所述的设备,其中所述设备还包括用于控制在构建面板上的一个或多个气流的装置。
25.根据权利要求23所述的设备,其中用于控制所述构建空间内的一个或多个气流的装置选自管子、扩散器、喷嘴和/或挡板。
26.根据权利要求20所述的设备,其中所述设备适于由权利要求12和13所述的颗粒材料和打印液体以及它们的组合形成的材料体系。
27.根据权利要求20所述的设备,其中所述设备还包括用于最小化或避免不期望的对流移动的隔热件。
28.根据权利要求15至19中任一项所述的设备,其中所述相对湿度或相对溶剂浓度被设定为在50%和80%之间。
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