CN116275093A - 金属液滴喷射三维(3d)物体打印机和用于形成金属支撑结构的操作方法 - Google Patents
金属液滴喷射三维(3d)物体打印机和用于形成金属支撑结构的操作方法 Download PDFInfo
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Abstract
三维(3D)金属物体制造装置配备有磁场发生器,以选择性地围绕喷嘴形成磁场,从该喷嘴喷射熔融金属液滴。在磁场存在下喷射的液滴的速度从其喷射时的初始速度降低。减小的速度增加了液滴在撞击其着陆区域之前的飞行时间。增加的行进时间使熔融金属液滴能够充分氧化,以使它们较不穿过磁场喷射的液滴不太紧密地粘结。因此,装置可以形成金属支撑结构,该金属支撑结构较不紧密地粘附到物体的零件部分,因此它们在打印物体之后可以更容易地移除。
Description
技术领域
本公开涉及三维(3D)物体打印机,该三维物体打印机喷射熔融金属液滴以形成物体,并且更具体地,涉及金属支撑结构的形成,该形成使用的是用于在此类打印机中形成物体的喷射的金属。
背景技术
三维打印也称为增材制造,是由几乎任何形状的数字模型制备三维固体物体的工艺。许多三维打印技术使用增材工艺,其中增材制造设备喷射构建材料的液滴或挤出构建材料的带,以在先前沉积的层的顶部上形成零件的连续层。这些技术中的一些使用喷射可UV固化材料的喷射器,该可UV固化材料诸如光聚合物或弹性体,而其他的则是熔融塑料材料以产生热塑性材料,该热塑性材料被挤出以形成连续的热塑性材料层。这些技术用于构造具有各种形状和特征的三维物体。这种增材制造方法与传统物体形成技术不同,该传统物体形成技术主要依赖于通过减成法(诸如切割或钻孔)从工件上去除材料。
最近,已经开发出一些3D物体打印机,该3D物体打印机从一个或多个喷射器喷射熔融金属液滴以形成3D金属物体。这些打印机具有固体金属源,诸如线材卷、宏观尺寸的球粒或金属粉末,并且将固体金属馈送到打印机中贮器的加热接收器中,其中固体金属被熔融并且熔融金属填充接收器。接收器由非导电材料制成,电线围绕该接收器包裹以形成线圈。电流通过线圈以产生电磁场,该电磁场致使接收器的喷嘴处的熔融金属液滴的从该接收器内的熔融金属分离并且从该喷嘴被推射出去。平台被配置成通过控制器操作致动器在平行于平台平面的X-Y平面中移动,因此从喷嘴喷射的熔融金属液滴在平台上形成物体的金属层。控制器操作另一个致动器以改变喷射器或平台的位置,以维持喷射器与形成中的金属物体的现有层之间的恒定距离。这种类型的金属液滴喷射打印机被称为磁流体动力学(MHD)打印机。
在使用弹性体材料的3D物体打印系统中,通过使用另外的喷射器以喷射不同材料的液滴来形成临时支撑结构,以形成用于悬垂物和在形成物体期间远离物体延伸的其他物体特征的支撑件。因为这些支撑结构是由与形成物体的材料不同的材料制成的,所以它们可以被设计成不与物体很好地粘附或粘结。因此,这些支撑结构可以很容易地与在物体制造期间它们所支撑的物体特征分离,并在物体形成完成后从物体移除。而金属液滴喷射系统则不是这样。如果打印机中用于形成物体的熔融金属也用于形成支撑结构,则该支撑结构与物体特征会坚固地粘结,其中该物体特征在固化期间需要支撑件。因此,需要大量的切割、机械加工和抛光来从物体移除支撑件。使用不同金属来协调另一台金属液滴喷射打印机是困难的,因为不同金属的热条件可以影响两台打印机的构建环境。例如,与物体相比,具有较高熔融温度的支撑结构金属可以弱化或软化形成物体的金属或当采用较高温度的熔融金属制成的物体特征接触具有较低熔融温度的支撑金属结构时,该支撑金属结构可弱化。能够形成支撑结构将是有益的,这些支撑结构使得金属液滴喷射打印机能够形成金属物体悬垂物和其他延伸特征。
发明内容
操作3D金属物体打印机的新方法形成支撑结构,这些支撑结构不紧密粘附到由这些结构支撑的物体特征。该方法包括检测待利用喷射器头部形成的支撑结构层的一部分,该喷射器头部被配置成通过喷嘴朝向平面构件喷射熔融金属液滴,并且操作磁场发生器以生成磁场,所喷射的熔融金属液滴在平面构件处被接收之前穿过磁场。
新的3D金属物体打印机形成支撑结构,该支撑结构不紧密粘附到由结构支撑的物体特征。新的3D金属物体打印机包括喷射器头部,该喷射器头部被配置成通过喷嘴喷射熔融金属液滴;磁场发生器,该磁场发生器被配置成在喷嘴处生成磁场;平面构件,该平面构件被定位成接收从喷射器头部喷射的熔融金属液滴;以及控制器,该控制器操作地连接到磁场发生器,该控制器被配置成操作磁场发生器以生成磁场,所喷射的熔融金属液滴在平面构件处被接收之前穿过磁场。
附图说明
下面结合附图说明了用于形成支撑结构的方法以及实施该方法的3D金属物体打印机的前述方面和其他特征,这些支撑结构不紧密地粘附到由这些结构支撑的物体特征。
图1描绘了新的3D金属物体打印机,其形成支撑结构,这些支撑结构不紧密粘附到由这些结构支撑的物体特征。
图2描绘了围绕图1中所示的3D金属物体打印机的喷嘴的电磁线圈,其选择性地操作以形成不紧密粘附到物体特征的支撑结构。
图3是熔融金属液滴撞击表面时所处的最终速度相对于熔融金属液滴的初始速度的比率以及飞行时间相对于参考情况的比率的曲线图,在参考情况中喷射的熔融金属液滴的速度不会明显改变。
图4A示出了由图1的3D金属物体打印机制造的零件中的支撑材料的形成。
图4B示出了在已经移除支撑结构之后图4A的完成的零件。
图5是操作图1的3D金属物体打印机来形成支撑结构的过程的流程图,该支撑结构不紧密粘附到由结构支撑的物体特征。
图6是现有技术的3D金属打印机的框图,该3D金属打印机不包括部件,该部件用于形成利用用于形成物体的相同金属制成的支撑结构。
具体实施方式
为了对如本文所公开的3D金属物体打印机及其操作的一般性理解以及该打印机及其操作的细节,参考附图。在附图中,类似的附图标记指示类似的元件。
图6示出了先前已知的3D金属物体打印机100的实施方案,该3D金属物体打印机无法在支撑结构没有太过紧密地粘附到物体特征的情况下利用用于形成金属物体的相同熔融金属来形成支撑结构。如本文档中所使用,术语“支撑结构”是指用从喷射器头部喷射的熔融金属液滴制成的金属的形成件,稍后从由喷射器头部喷射的其他熔融金属液滴形成的零件中移除。如本文所用,术语“零件”是指利用3D金属液滴喷射装置制成的制造物体。在图6的打印机中,熔融块体金属液滴从具有单个喷嘴108的可移除贮器104的接收器被喷射,以在构建平台112上形成所制造物体的层。如本文档中所用,术语“可移除贮器”是指具有被构造成保持液体或固体物质的接收器的中空容器,并且该容器作为整体被构造成在3D金属物体打印机中进行安装和移除。如本文档中所用,术语“贮器”是指具有被构造成保持液体或固体物质的接收器的中空容器,该容器作可以被构造成在3D金属物体打印机中进行安装和移除。如本文档中所用,术语“块体金属”是指可以聚集体形式获得的导电金属,诸如通常可用规格的线材、宏观尺寸的球粒以及金属粉末。
进一步参考图6,块体金属的源116(诸如金属线材120)被进料到线材引导件124中,该线材引导件延伸穿过喷射器头部140中的上壳体122,并且在可移除贮器104的接收器中熔融,以提供熔融金属用于通过喷射器头部140的底板114中的孔110从喷嘴108喷射。如本文档中所用,术语“喷嘴”是指流体连接到容纳熔融金属的贮器的接收器内的容积的孔,该孔被构造成从贮器内的接收器中排出熔融金属液滴。如本文档中所用,术语“喷射器头部”是指3D金属物体打印机的熔融、喷射和调节熔融金属液滴的喷射以用于产生金属物体的壳体和部件。熔融金属液位传感器184包括激光传感器和反射传感器。激光从熔融金属液位的反射由反射传感器检测,该反射传感器生成指示到熔融金属液位的距离的信号。控制器接收这种信号并确定熔融金属的体积在可移除贮器104中的液位,因此其可以在可移除贮器的接收器中被保持在适当液位118处。可移除贮器104滑入加热器160中,使得加热器的内径接触可移除贮器,并且能够将可移除贮器的接收器内的固体金属加热至足以熔融固体金属的温度。如本文档中所用,术语“固体金属”是指如由元素周期表所定义的金属或由这些金属形成的合金,其是固体形式而不是液体或气体形式。加热器与可移除贮器分离以在加热器与可移除贮器104之间形成容积。惰性气体供应源128通过气体供应管132向喷射器头部提供惰性气体(诸如氩气)的压力调节源。气体流过加热器与可移除贮器之间的容积,并且围绕喷嘴108和底板114中的孔110离开喷射器头部。这种邻近喷嘴的惰性气体流将熔融金属的喷射液滴与底板114处的环境空气隔绝,以防止在喷射液滴飞行期间形成金属氧化物。喷嘴与喷射的金属滴降落的表面之间的间隙有意地保持足够小,使得在喷嘴周围离开的惰性气体在这种惰性气体流中的液滴降落之前不会消散。
喷射器头部140可动地安装在Z轴轨道内,以用于喷射器头部相对于平台112移动。一个或多个致动器144操作地连接到喷射器头部140以沿着Z轴移动喷射器头部,并且操作地连接到平台112以在喷射器头部140下方的X-Y平面中移动平台。致动器144由控制器148操作,以保持喷射器头部140的底板114中的孔110与平台112上的物体的表面之间的适当距离。
当朝平台112喷射熔融金属液滴时,在X-Y平面中移动平台112形成正在形成的物体上的熔融金属液滴的条带。控制器148还操作致动器144以调整喷射器头部140与衬底上最近形成的层之间的距离,以便于在物体上形成其他结构。虽然熔融金属3D物体打印机100在图6中被描绘为以竖直取向操作,但是也可采用其他另选取向。另外,虽然图6所示的实施方案具有在X-Y平面中移动的平台并且喷射器头部沿Z轴移动,但其他布置方式也是可能的。例如,致动器144能够被构造成使喷射器头部140在X-Y平面中并且沿着Z轴移动,或者这些致动器能够被构造成在X-Y平面和Z轴两者中移动平台112。
控制器148操作切换装置152。能够选择性地由控制器操作一个切换装置152以将电功率从源156提供到加热器160,同时能够选择性地由控制器操作另一个切换装置152以将电功率从另一个电源156提供到线圈164,以用于生成从喷嘴108喷射液滴的电场。因为加热器160在高温下生成大量热量,所以线圈164定位在由喷射器头部140的一个壁(圆形)或更多个壁(直线形状)形成的室168内。如本文档中所用,术语“室”是指金属液滴喷射打印机内的一个或多个壁内所容纳的容积,3D金属物体打印机的加热器、线圈和可移除贮器定位在该容积中。可移除贮器104和加热器160定位在这种室内。该室通过泵176以流体方式连接到流体源172,并且还以流体方式连接到热交换器180。如本文档中所用,术语“流体源”是指具有可用于吸收热量的特性的液体的容器。热交换器180通过返回件连接到流体源172。来自源172的流体流过室以从线圈164吸收热量,并且流体携带所吸收的热量通过交换器180,在该交换器处通过已知方法移除热量。经冷却的流体返回到流体源172,以进一步用于将线圈的温度保持在适当的可操作范围内。
3D金属物体打印机100的控制器148需要来自外部源的数据以控制打印机用于金属物体制造。通常,待形成的物体的三维模型或其它数字数据模型存储在操作地连接到控制器148的存储器中。控制器可以通过服务器等、存储数字数据模型的远程数据库或存储数字数据模型的计算机可读介质选择性地访问数字数据模型。该三维模型或其他数字数据模型由用控制器实现的截剪器处理,以生成机器就绪指令,该指令用于由控制器148以已知方式执行,从而操作打印机100的部件并且形成对应于模型的金属物体。机器就绪指令的生成可包括中间模型的产生(诸如当设备的CAD模型被转变为STL数据模型、多边形网片或其他中间表示时),继而能够处理该中间模型以生成机器指令,诸如用于由打印机制造物体的g代码。如本文档中所用,术语“机器就绪指令”是指由计算机、微处理器或控制器执行以操作3D金属物体增材制造系统的部件以在平台112上形成金属物体的计算机语言命令。控制器148执行机器就绪指令以控制熔融金属液滴从喷嘴108喷射、平台112的定位以及保持孔110与平台112上的物体的表面之间的距离。
图1中示出了一种新的3D金属物体打印机100',它使用类似部件的类似参考号,并且移除了不用于形成在形成期间不紧密粘附于物体的金属支撑结构的部件中的一些。打印机100'包括电磁线圈204,该电磁线圈围绕贮器104的喷嘴108缠绕,如图2所示。此电磁线圈通过切换装置152中的一者连接到电源156。控制器148'(该控制器被配置有存储在连接到该控制器的非暂时性存储器中的编程指令)操作切换装置152中的一者,以在控制器148'执行用于形成金属支撑结构的编程指令时选择性地将电磁线圈204连接到电力。当线圈连接到电源156时,其产生磁场并且所喷射的熔融金属液滴必须穿过该场。如下文更充分地解释,该场对熔融金属液滴的影响降低了喷射的熔融金属液滴的速度,因此它们在它们撞击其着陆区域之前具有时间来氧化。这些氧化的金属液滴不会紧密粘结到零件的固化金属上,也不会彼此紧密粘结。因此,金属支撑结构可以由氧化金属液滴形成,并且因为它们不会紧密粘结到零件或彼此紧密粘结,因此在制造零件完成之后可以容易地移除金属支撑结构。
如图2所示,电磁线圈204围绕延伸穿过板114的喷嘴108缠绕。在一个实施方案中,线圈204的总规格是美国线规(AWG)2/0,针对从电源156接收到的高达220安培的电流。线圈204形成有围绕喷嘴108缠绕的多个同心匝208,并且电线的这种同心布置形成AWG 2/0的总线规。在此实施方案中,沿喷嘴108的10mm长度提供十个同心布置212。如本文档中所使用,术语“电导线布置”是指围绕喷射器头部喷嘴的电导线的同心缠绕,以形成电导线的盘,该盘从通过喷嘴的通道的圆周垂直延伸。
几乎没有动能或没有动能地在表面上着陆的熔融金属液滴具有减少的粘结强度。这种减少的粘结强度被认为是由较低的液滴速度引起,从而降低熔融金属液滴之间润湿和聚结的有效性。操作电磁线圈204降低穿过磁场的液滴的速度,从而降低液滴彼此粘结的能力。由穿过线圈的电流产生的稳定磁场垂直于喷射液滴的运动。该场在液滴中诱导涡流,这继而在与液滴的运动相反的方向上诱导洛伦兹力。此洛伦兹力用于抑制液滴的运动,并且机械能随着热量而耗散。阻尼力与液滴的速度成比例。因此,跨喷嘴和液滴着陆表面之间约10mm的间隙的均匀磁场导致具有500微米直径的熔融金属液滴,该液滴以3.5m/s的初始速度喷射以具有为磁场强度的函数的减少的速度和飞行时间。
图3的曲线图示出了熔融金属液滴撞击表面所处的最终速度相对于喷射的液滴的初始速度的比率,以及液滴的飞行时间相对于没有磁性阻尼的参考情况的比率。为了产生弱粘结液滴,目标为0.5或以下的撞击速度比率和2或以上的飞行时间比率。这些值用于识别约0.27特斯拉(或2700高斯)的磁场强度,以足以用于降低形成弱粘结的支撑结构的熔融金属液滴的撞击速度。这些液滴的速度降低使得液滴能够氧化超过形成零件408的无扰液滴,因此它们不会强烈粘结。为了进一步增强喷射的金属液滴的氧化,控制器148'可以操作输入管线132中的阀134,以选择性地将惰性气体供应128与围绕喷嘴108的空间断开,因此惰性气体在熔融金属液滴到着陆表面的行进期间不会阻碍它们的氧化。
图4A示出了零件408中具有弱粘结区段404的复合物体400。零件408利用熔融金属液滴形成,该熔融金属液滴被喷射并且在撞击表面之前未穿过磁场。区段404利用熔融金属液滴形成,该熔融金属液滴在撞击表面之前确实穿过由电磁线圈204产生的磁场。先前针对所述间隙和初始速度识别的磁场强度使得熔融金属液滴能够遇到磁场以与不穿过磁场的液滴相比氧化多两倍以上。当区段404被移除以离开零件408时,如图4B所示,可以看出最低区段404在零件制造期间支撑零件中的开口的下桥412,以及填充开口支撑的突出部416的区段。因为这些区段以及填充孔420的区段被弱粘结在一起,所以可以在不需要机械加工或切割操作的情况下从零件408中移除它们。
控制器148'能够用执行编程指令的一个或多个通用或专用可编程处理器实现。执行编程功能所需的指令和数据可以存储在与处理器或控制器相关联的存储器中。处理器、处理器的存储器和接口电路配置控制器来执行前面描述的以及下面描述的操作。这些部件可以设置在印刷电路卡上,或者设置为专用集成电路(ASIC)中的电路。每个电路可以由单独的处理器实现,或者多个电路可以在同一处理器上实现。另选地,这些电路可以由分立部件或设置在超大规模集成(VLSI)电路中的电路来实现。此外,本文所述的电路可以用处理器、ASIC、分立部件或VLSI电路的组合来实现。在金属物体形成期间,用于待产生的结构的图像数据从扫描系统或者从在线连接或工作工位连接被发送到控制器148'的一个或多个处理器,以用于处理和生成操作打印机100'的部件以在平台112上形成物体的信号。
图5中示出了用于操作3D金属物体打印机100'以形成弱附接到物体特征的金属支撑结构的过程。在该过程的描述中,该过程正在执行某一任务或功能的陈述是指控制器或通用处理器执行编程指令以操纵打印机中的一个或多个部件来执行任务或功能,该编程指令存储在操作地连接到控制器或处理器的非暂态计算机可读存储介质中。上述控制器148'可以是此类控制器或处理器。另选地,控制器可由多于一个的处理器和相关联的电路和部件来实现,它们中的每一者均被配置为形成本文所描述的一个或多个任务或功能。此外,该方法的步骤可以以任何可行的时间顺序执行,而与图中所示的顺序或描述处理的顺序无关。
图5是过程500的流程图,该过程使用电磁线圈204和控制器148',该控制器被配置成执行存储在操作地连接到该控制器的非暂时性存储器中的编程指令,以构建金属支撑结构,该金属支撑结构弱附接到其支撑或在其上所构建的物体特征。该过程开始形成物体层的零件部分(框504),直到检测到所形成的层的支撑结构部分(框508)。控制器操作切换装置152中的一者以将线圈204连接到电源156,并在喷射器喷嘴处生成磁场(框516)。形成用于支撑结构的层的部分的熔融金属液滴穿过由线圈产生的磁场喷射,因此液滴在着陆之前氧化(框520)。一旦支撑结构部分完成(框524),该过程就确定层是否已完成(框512),并且如果不,则其继续形成零件部分(框504)。一旦该层完成,该过程就确定是否完成物体的形成(框528),如果不,则形成另一层(框504、508、516、520和524)。若物体制造完成(框528)时,该过程停止。
应当理解的是,以上公开的与其他特征和功能的变型或其替代者可期望地被组合到许多其他不同的系统、应用或方法中。本领域的技术人员随后可做出各种当前未预见或未预料到的替换、修改、变化或改进,这些也旨在被以下权利要求书涵盖。
Claims (20)
1.一种金属液滴喷射装置,所述金属液滴喷射装置包括:
喷射器头部,所述喷射器头部被配置成通过喷嘴喷射熔融金属液滴;
磁场发生器,所述磁场发生器被配置成在所述喷嘴处生成磁场;
平面构件,所述平面构件被定位成接收从所述喷射器头部喷射的熔融金属液滴;以及
控制器,所述控制器操作地连接到所述磁场发生器,所述控制器被配置成操作所述磁场发生器以生成磁场,所喷射的熔融金属液滴在所述平面构件处被接收之前穿过所述磁场。
2.根据权利要求1所述的装置,所述装置进一步包括:
电磁线圈,所述电磁线圈围绕所述喷射器头部的所述喷嘴缠绕;
电源;
切换装置,所述切换装置被配置成将所述电源连接到所述电磁线圈;并且
所述控制器被操作地连接到所述切换装置,所述控制器被进一步配置成操作所述切换装置以选择性地将所述电源连接到所述电磁线圈以选择性地生成所述磁场。
3.根据权利要求2所述的装置,所述控制器被进一步配置成:
当正利用从所述喷射器头部喷射的所述熔融金属液滴形成支撑结构时,操作所述切换装置以将所述电磁线圈连接到所述电源;以及
当利用从所述喷射器头部喷射的所述熔融金属液滴形成金属零件的一部分时,操作所述切换装置以将所述电磁线圈与所述电源断开。
4.根据权利要求3所述的装置,所述电磁线圈进一步包括:
电导线的多个布置,每个布置具有电导线的多个同心匝,所述电导线的多个同心匝形成电导线盘,并且每个盘从通过所述喷嘴的通道的圆周垂直延伸,所述布置沿着所述喷嘴的长度的一部分彼此平行。
5.根据权利要求4所述的装置,其中电导线的同心匝的每个布置产生美国线规2/0线规。
6.根据权利要求5所述的装置,其中所述电导线的同心匝的每个布置包括所述电导线的十个同心匝。
7.根据权利要求6所述的装置,其中所述多个布置包括沿所述喷嘴的十毫米长度彼此平行的电导线的十个布置。
8.根据权利要求7所述的装置,其中当通过所述切换装置连接到所述电磁线圈时,所述电源向所述多个布置供应高达220Amp的电流。
9.根据权利要求8所述的装置,其中由所述多个布置产生的所述磁场为约2700高斯,并且所述平面构件与所述喷嘴之间的距离为约10mm。
10.根据权利要求8所述的装置,所述装置进一步包括:
惰性气体源,所述惰性气体源被配置成在平行于从所述喷嘴喷射的熔融金属液滴的行进路径的方向上产生围绕所述喷嘴的惰性气体流动;
阀,所述阀介于所述惰性气体源和所述喷嘴之间;以及
控制器,所述控制器操作地连接到所述阀,并且所述控制器被进一步配置成:
当所述电磁线圈正在生成磁场时,选择性地操作所述阀以移除围绕所述喷嘴的所述惰性气体流动。
11.一种操作金属液滴喷射装置的方法,所述方法包括:
检测待利用喷射器头部形成的支撑结构层的一部分,所述喷射器头部被配置成通过喷嘴朝向平面构件喷射熔融金属液滴;以及
操作所述磁场发生器以生成磁场,所喷射的熔融金属液滴在所述平面构件处被接收之前穿过所述磁场。
12.根据权利要求11所述的方法,所述方法进一步包括:
操作切换装置,所述切换装置被配置成在正利用从所述喷射器头部喷射的所述熔融金属液滴形成所述支撑结构层的所检测到的部分时将电力选择性地连接到围绕所述喷射器头部的所述喷嘴缠绕的电磁线圈,以生成所述磁场。
13.根据权利要求12所述的方法,所述方法进一步包括:
当正利用从所述喷射器头部喷射的所述熔融金属液滴形成金属零件的一部分时,操作所述切换装置以将所述电磁线圈与所述电源断开。
14.根据权利要求12所述的方法,所述切换装置将所述电磁线圈连接到电力的所述操作进一步包括:
将电力连接到电导线的多个布置,每个布置具有电导线的多个同心匝,所述电导线的多个同心匝形成电导线盘,并且每个盘从通过所述喷嘴的通道的圆周垂直延伸,所述布置沿着所述喷嘴的长度的一部分彼此平行。
15.根据权利要求14所述的方法,其中电导线的同心匝的每个布置产生美国线规2/0线规。
16.根据权利要求15所述的方法,其中所述电导线的同心匝的每个布置包括所述电导线的十个同心匝。
17.根据权利要求16所述的方法,其中所述多个布置包括沿所述喷嘴的十毫米长度彼此平行的电导线的十个布置。
18.根据权利要求17所述的方法,所述切换装置将电力连接到电导线的所述多个布置的所述操作进一步包括:
连接电源,所述电源被配置成向所述多个布置供应高达220Amp的电流。
19.根据权利要求18所述的方法,所述磁场的所述生成进一步包括:
在所述平面构件与所述喷嘴之间跨约10mm的距离产生具有约2700高斯的场强的所述磁场。
20.根据权利要求18所述的方法,所述方法进一步包括:
当电导线的所述多个布置不生成磁场时操作阀,所述阀操作地连接到惰性气体源以围绕所述喷嘴供应惰性气体流动;以及
当所述多个电导线布置正生成磁场时,操作所述阀以移除围绕所述喷嘴的惰性气体流动。
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US10807119B2 (en) * | 2013-05-17 | 2020-10-20 | Birmingham Technologies, Inc. | Electrospray pinning of nanograined depositions |
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US10625337B2 (en) * | 2017-04-21 | 2020-04-21 | Desktop Metal, Inc. | Adhesion to build plate in 3D printer |
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