CN104015919B - 制造复合芯的方法 - Google Patents
制造复合芯的方法 Download PDFInfo
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Abstract
一种制造复合芯的方法,该方法可以包括:构造多个芯棒以具有期望的热膨胀特性;围绕每个芯棒放置复合材料;将所述多个芯棒放置在工具中,该工具构造成在芯棒经历热膨胀时限制所述多个芯棒;加热芯棒以使芯棒热膨胀,从而在固化周期期间向复合材料施加压力;以及随后冷却芯棒并使芯棒与复合芯分离。该芯棒构造为内模,用于制造复合芯的管构件。
Description
技术领域
本公开涉及一种使用压力可调的芯棒制造复合结构的系统和方法。
背景技术
诸如复合蜂窝状芯之类的复合结构通常可以通过使用施加压制压力的诸如固定装置之类的外部工具来制造,其中,用于固化复合材料所需的压力通过外部工具与芯的孔内的内部工具之间的压力来产生。在固化过程期间可能难以产生并保持对蜂窝状芯的孔壁处压力的精确控制,部分原因是因为内部工具的误差叠加。此外,由于工具的热膨胀系数可能不足以从蜂窝状芯的孔壁脱出,因此内部工具在固化周期后可能难以移除。
因此,存在对于需要内部工具和压力来制造复合芯或其他复合结构的改进的系统和方法的需求。
发明内容
本发明提供了一种制造复合芯的方法,所述方法包括如下步骤:提供多个芯棒,每个芯棒均包括:本体部,所述本体部具有外表面,所述外表面限定所述复合芯的管构件的最终形状;以及中空部,所述中空部限定所述本体部的内表面,所述中空部具有能够在多个压力阶段中塌陷的星形几何结构,所述星形几何结构具有各自终止于一点处的多个平壁腿部,所述多个平壁腿部从内部延伸;围绕每个芯棒放置复合材料;将所述多个芯棒放置在工具中,所述工具构造成在所述芯棒经历热膨胀时限制所述多个芯棒;加热所述芯棒以使所述芯棒热膨胀,从而在固化周期期间向所述复合材料施加压力,加热所述芯棒的步骤包括使所述芯棒的温度增大一段时期,在所述一段时期内的温度的增大导致所述中空部的所述平壁腿部塌陷时的第一压力平稳以及所述内部的直径塌陷时的第二压力平稳;以及冷却所述芯棒并且将所述芯棒与所述复合芯分离。
另外,围绕每个芯棒放置所述复合材料的步骤包括围绕每个芯棒缠绕所述复合材料。
另外,每个芯棒均具有在径向方向上非线性的热膨胀系数。
另外,每个芯棒均呈六边形形状。
另外,加热所述芯棒以使所述芯棒热膨胀的步骤包括使空气流动通过每个芯棒中的所述中空部。
另外,将所述多个芯棒放置在工具中的步骤包括相邻地堆叠所述芯棒以形成第一管构件,所述第一管构件使另一管构件与所述第一管构件的每个小面表面相邻。
另外,加热所述芯棒以使所述芯棒热膨胀的步骤包括控制所述芯棒的温度以控制由所述芯棒施加在所述复合材料上的压力。
附图说明
在下文中陈述了认为是本公开的系统和方法的特性的创新性特征。然而,通过在结合附图阅读时参照以下的详细描述将最好地理解该系统和方法本身及优选的使用模式以及其进一步的目的和优点,附图中:
图1为根据一个示例实施方式的旋翼飞行器的侧视图;
图2为根据一个示例实施方式的面板的侧视图;
图3为根据一个示例实施方式的面板的从图2中的线3-3截取的截面图;
图4为根据一个示例实施方式的复合芯的立体图;
图5为根据一个示例实施方式的复合芯的从图4中的线5-5截取的截面图;
图6为根据一个示例实施方式的制造复合芯的方法的示意图;
图7为根据示例实施方式的芯棒的截面图;
图8为根据示例实施方式的芯棒的截面图;
图9为根据示例实施方式的芯棒的截面图;
图10为根据示例实施方式的芯棒的截面图;
图11为根据示例实施方式的芯棒的截面图;
图12A为根据一个示例实施方式的已组装在部分工具上的多个复合缠绕芯棒的截面图;
图12B为根据一个示例实施方式的已组装在固化工具上的多个复合缠绕芯棒的截面图;
图13为根据一个示例实施方式的从图12B截取的细节图;
图14为根据一个特定实施方式的用未固化的复合材料缠绕的芯棒的说明性实施方式的程式化平面图;以及
图15为根据一个特定实施方式的用未固化的复合材料缠绕的芯棒的说明性实施方式的程式化平面图。
具体实施方式
以下描述了本公开的系统和方法的说明性实施方式。为了清晰起见,可以不在这个说明书中对实际实施的所有特征进行描述。当然要理解的是在任何这样的实际的实施方式的开发中,必须作出多个特定实施方案以实现开发者的特定目的,比如符合与系统相关和与商业相关的限制,这在各实现方案间是不同的。此外,需要理解的是这样的开发工作可能很复杂并且耗费时间,但是对于受益于本公开的本领域技术人员而言却是日常的工作。
在本说明书中,在附图中描绘装置时,可以参照各部件之间的空间关系和部件各方面的空间方位。然而,正如本领域技术人员在完整阅读本公开之后将会认识到的,本文中所描述的装置、构件、设备等可以以任意的期望方位定位。由此,由于本文中所描述的装置可以以任意的期望方向定向,所以用以描述各部件之间的空间关系或者用以描述这些部件多方面的空间方位的诸如“上方”、“下方”、“上部”、“下部”之类的措辞的使用应当分别理解为描述部件或这些部件的多方面的空间方位之间的相对关系。
现在参照附图中的图1,示出了旋翼飞行器101。旋翼飞行器101具有旋翼系统103,该旋翼系统103具有多个旋翼叶片105。每个旋翼叶片105的俯仰可以被操纵以便选择性地控制旋翼飞行器101的方向、推力、以及升力。旋翼飞行器101还可以包括机身107、反扭矩系统109、以及尾翼111。
旋翼飞行器101仅仅是特别适于利用本公开的方法和系统的优点的众多飞行器和交通工具的示例。应当理解到,其他飞行器也可以使用本公开的方法和系统。此外,其他交通工具和结构可以使用通过本公开的系统和方法制造的复合芯。举几个例子来说,说明性实施方式可以包括风机叶片、船壳结构、雷达罩、包围件、遮盖件、桥面板、建筑立面、地面交通工具、轨道交通工具、飞行器、太空交通工具以及有人驾驶交通工具或无人驾驶交通工具。
现在另外参照图2和图3,旋翼飞行器101上的面板113是包括如下芯构件的众多结构的示例,该芯构件构造为在结构中产生强度和刚度的轻重量装置。面板113为可以包括上蒙皮301、下蒙皮303以及复合芯305的复合组件。复合芯305可以粘合地结合至上蒙皮301和下蒙皮305。应当理解到,面板113可以呈现多种轮廓和构型。
现在另外参照图4和图5,示出了呈原材料构型的复合芯401。具有实施为特定几何结构的复合芯305(图3中示出)例如可以通过复合芯401切制。在另一实施方式中,复合芯401制造为净成形使得不需要随后的切制步骤。复合芯401可以为众多的材料及孔尺寸的复合芯。例如,在一个实施方式中,复合芯401由碳纤维和树脂复合系统制成。复合芯401包括以二维阵列设置的多个管403(为了清晰起见,仅标记了一个管)。每个管403限定了延伸通过该管的通道或“孔”405。复合芯401可以包括任意适当数目、尺寸、横截面形状以及构造的管403。
复合芯401的每个管403可以包括以聚合物基体的形式设置的多个增强纤维。例如,管403可以包括如下纤维,该纤维包括碳、石墨、玻璃、聚芳酰胺(即“芳香聚酰胺”)材料、聚芳酰胺材料的变体(例如,诸如弗吉尼亚(Virginia)的里士满(Richmond)的E.I.du Pont deNemours and Company的之类的聚对苯二甲酰胺材料)等中的一者或多者。然而,本公开的范围包括含有任意适当的材料或材料组合的纤维。聚合物基体可以包括任意适当的热塑性树脂或热固性树脂。举几个例子来说,示例性树脂可以包括环氧树脂、聚酰亚胺、聚酰胺、双马来亚酰胺、聚酯、乙烯酯、酚醛树脂、聚醚醚铜(PEEK)、聚醚酮(PEK)、聚苯硫醚(PPS)。
管403的纤维可以沿一个或多个方向定向,并且可以为织物或非织物。应当理解到,管403可以替代性地仅包括沿单个方向设置的纤维,例如单轴纤维构型或螺旋纤维构型。在又一实施方式中,第一层包括纤维并且第二层包括纤维,使得第二层铺置在第一层之上。
现在另外参照图6,示意性地示出了制造诸如复合芯401之类的复合芯的方法601。方法601可以包括构造多个可膨胀芯棒的步骤603。步骤605可以包括围绕每个芯棒缠绕未固化的复合材料。步骤607可以包括组装已缠绕的芯棒。步骤609可以包括向芯棒施加热量以使芯棒在固化过程期间热膨胀并向复合材料提供期望量的压力。步骤611可以包括冷却芯棒并且从已固化的复合芯移除芯棒。本文将对方法601的每个步骤进行进一步详细地描述。
现在另外参照图7,示出了通过芯棒701的截面图。步骤603包括构造多个可膨胀芯棒。为了清晰起见,仅示出单个芯棒701。芯棒701构造具有相对较大的热膨胀系数(CTE)的材料。在一个示例实施方式中,芯棒701由塑性的、半塑性的、非晶态的、弹性的或半透明的材料制成。例如,在芯棒701中可以使用诸如聚醚酰亚胺之类的热塑性材料。芯棒701可以由在通过芯棒701提供的压紧的方向(相对于芯棒701的径向方向)上具有比被形成的复合材料的CTE更大的CTE的任何材料制造。然而,精确的芯棒CTE量可以特别实施。
芯棒701构造有延伸穿过芯棒701的中心线长度的中空部703,在中空部703与外表面707之间限定本体部705。在一个实施方式中,中空部703通过其中使用内部工具以形成中空部703形状的模制过程形成。芯棒701构造成使得在复合芯401的固化过程期间,每个芯棒701的温度均增大成使得本体部705沿向内方向709和向外方向711在体积上均匀地膨胀,直到外表面707受到与其最邻近的芯棒约束为止,在该位置处,由芯棒701施加在与其最邻近的芯棒上的压力保持相对恒定,并且本体部705的热膨胀主要沿向内方向709继续。这种热膨胀进程在固化周期期间提供了用于使复合芯401层压/固化所需的一段时期的相对恒定的压力。芯棒701的几何结构选择为调整芯棒701的物理特性、特别是材料的塑性/弹性。此外,选择性地控制本体部705的壁厚度以及中空部703的几何结构以产生期望的热膨胀分布。例如,相比芯棒701,具有更小的中空部703的芯棒由于本体部的更大厚度——其将产生更大量的热膨胀——将提供更大的外部压力。在示出的实施方式中,中空部703为圆柱形形状的中空部;然而,应当理解到,其他实施方式可以具有非圆柱形形状。
现在另外参照图8,芯棒801与芯棒701基本类似,因此除如以下指出的以外,本文中关于芯棒701的描述同样能够适用于芯棒801。类似于芯棒701,芯棒801具有中空部803、本体部805以及外表面807。然而,中空部803相比芯棒701的中空部703的直径具有更小的直径。因此,芯棒801构造成相比芯棒701在给定的温度下提供更大量的热膨胀。因此,芯棒801构造成相比芯棒701在给定温度下在相邻芯棒之间的复合材料上提供更大量的外部压力。此外,芯棒801可以特别理想地用于在相对较低的温度下期望相对恒定压力时期的固化周期中使用。
现在另外参照图9,芯棒901与芯棒701基本类似,因此除以下指出的以外,本文中关于芯棒701的描述同样能够适用于芯棒。类似于芯棒701,芯棒901具有本体部905和外表面907。然而,芯棒901具有诸如中空部903a至中空部903e之类的多个中空部。在示出的实施方式中,中空部903a至903e相等地定尺寸并且等间距地围绕芯棒901的中心轴线定位,从而在热膨胀期间提供了均匀对称的外部压力。然而,中空部903a至903e可以单个地定尺寸并且由于热膨胀的原因定位成提供非对称的外部压力。
现在另外参照图10,芯棒1001与芯棒701基本类似,因此除以下指出的以外,本文中关于芯棒701的描述同样能够适用于芯棒1001。类似于芯棒701,芯棒1001具有中空部1003、本体部1005以及外表面1007。然而,中空部1003为星形形状的,该星形形状具有多个腿部构件。芯棒1001构造成使得中空部1003通过从一个主要塌陷机构过渡至另一个主要塌陷机构而提供了多阶段的压力平稳。例如,随着本体部1005的温度增大,因此,三角形腿部构件首先塌陷,从而提供了初始压力平稳,接下来中央区域随后在直径方面收缩,从而提供了第二次压力平稳。
现在另外参照图11,芯棒1101与芯棒1001基本类似,因此除以下指出的以外,本文中关于芯棒1001的描述同样能够适用于芯棒1101。类似于芯棒1001,芯棒1101具有中空部1103、本体部1105以及外表面1007。然而,相比芯棒1001的中空部1003的腿部构件,星形形状的腿部构件的中空几何结构更宽。芯棒1101为中空部1103的几何结构如何可以调整为提供贯穿固化过程的实施特定压力分布的示例。
应当理解到,芯棒701、801、901、1001、1101仅仅是设想到的众多芯棒构造的示例。尽管芯棒的外部形状被示出为六边形,但本公开也包括具有其他外部形状——举几个例子来说,例如正方形、矩形、三角形——的芯棒。此外,应当理解到,芯棒内的中空部可以为任何形状。中空部的精确形状是特别实施的。此外,中空部可以具有全部或局部塌陷以产生压力平稳的特征。可塌陷特征的精确形状是特别实施的。此外,中空部的形状和尺寸可以构造成使得能够在芯棒的拐角处提供更大量的外部压力,从而在相邻的复合构件接合所处的节点部处产生更大量的压力,这对于防止在节点处形成空隙是可以令人满意的。节点1301(图13中示出)为相邻复合管403的接合交叉点。此外,可以使用多个中空部的渐变混合以在比固体材料响应的斜率更低的斜率处使压力渐变。定尺寸的中空部的渐变混合可以为容纳并分布在芯棒本体部中的球形泡或近球形泡的形式。
再次参照图6,步骤605包括围绕例如芯棒701之类的每个芯棒缠绕未固化的复合材料。在每个芯棒的外表面上缠绕或以其它方式沉积未固化的材料的精确方法。在一个示例实施方式中,材料或其他抗结合材料可以用于防止复合材料在固化周期期间结合至芯棒701的外表面。另外参照图14,围绕芯棒701缠绕未固化的材料的一种技术使用纤维缠绕过程。从纤维缠绕机1403延伸的连续的树脂浸渍纤维1401绕芯棒701缠绕。树脂可以为或热固性树脂或者热塑性树脂,并且在固化时变为管403的聚合物基底。材料放置过程可以以多种过程来实施;然而,芯棒701优选在纤维1401的线轴如箭头1407所指示地围绕芯棒701旋转时轴向地移动。替代性地,材料的线轴或多个线轴可以绕芯棒701旋转。材料分配机构与芯棒701的相对运动可以推测。随着纤维1401由纤维缠绕机1403缠绕到芯棒701上,形成了螺旋状的图案。纤维1401的一层或多个层1409相对于芯棒701沿期望的方向缠绕到芯棒701上以形成管403的基本几何结构。纤维1401绕芯棒701缠绕的角度可以沿着芯棒701的长度变化以定制芯401的长度。例如,在材料放置过程期间纤维1401的角度可以动态地改变以定制芯的压缩长度。应当指出的是,在示出的实施方式中,芯棒701呈现出与孔405相对应的尺寸和形状(见图4或图5)。然而,还应当指出的是,本描述不限于特别示出的纤丝缠绕机1403或芯棒701的构型。芯棒701和已经纤维缠绕到芯棒701上的一层或多个层1409随后与其他芯棒和层组装——如将在本文中更加详细地讨论的——以形成芯401(图4中示出)。还应当理解到,在对层1409和芯棒701进行切割时,材料可能具有退绕的趋势。潜在粘合的或纤维的材料带可以用来在切割层1409和芯棒701时防止纤维1401散开。具有单向纤维的粘合材料可以用来将纤维1401绑附在芯棒1701上并保持与基材相容。
在图15中示出的执行方法601的步骤605的又一示例技术中,利用纤维放置过程执行围绕芯棒701缠绕未固化的复合材料。通过纤维放置机1505将大约1000根纤维的连续的树脂浸渍纤维束1501(为了清楚起见仅标记了一个)施加至芯棒701。应当理解到,纤维束1501也可以为全纤维束中的部分纤维束。例如,纤维束1501可以为500根纤维的半纤维束。代替纤维束1501,可以使用切成规定宽度的纤维带。预切制的纤维带可以被称作“狭长带”。相比纤维束,狭长带允许用户更精密地控制宽度尺寸。举几个例子来说,狭长带的示例性规定宽度包括1/8”(1/8英寸)和1/4”(1/4英寸)。举几个例子来说,树脂可以为热固性树脂或热塑性树脂,并且在固化时变成管403的聚合物基底。在纤维放置过程期间,芯棒701在纤维束1501如箭头1507指示地围绕芯棒701旋转时轴向地移动。随着纤维束1501由纤维放置机1505施加至芯棒701时,形成了螺旋状的图案。纤维束1501的一层或多个层1509相对于芯棒70沿期望的方向缠绕到芯棒701上。应当理解到,可以使用不同材料的多于一种的纤维束1501。应当指出的是,在示出的实施方式中,芯棒1503呈现出与孔405相对应的尺寸和形状(见图4和图5)。然而,还应当指出的是,本描述不限于特别示出的纤维放置机1505和芯棒701的构型。芯棒701和已经被纤维放置在芯棒701上的一层或多个层1509随后与其他芯棒以及其他层组装——如将在以下更加详细地描述的——以形成芯401(图4中示出)。
再次参照图6,方法601的步骤607包括组装已缠绕的芯棒。步骤607还可以包括将已缠绕的芯棒组装并插入到工具或其他固定装置中。工具的精确构型是特别实施的。现在另外参照图12A、图12B和图13,示出了工具1201的一种示例。工具1201可以包括与六边形形状的复合芯401共同形成外部圆筒形形状的多个部分工具1203a至1203f。然而,工具1201可以构造成产生任意期望形状的复合芯401。例如,工具1201的替代性形状可以构造为产生圆形的、正方形的、矩形的或甚至部分定制形状的复合芯401。在示出的实施方式中,具有经缠绕复合材料的多个芯棒701堆叠在部分工具1203a至203f上。随后,每个部分工具1203a至1203f与已缠绕的芯棒进行组装并插入到刚性构件1205中。已缠绕的芯棒可以在过程中与部分工具1203a至1203f组装,使得形成在部分工具1203a至1203f内部的空间由已缠绕的芯棒填充。刚性构件1205构造成随着芯棒在固化周期期间热膨胀而提供限制力。优选地,刚性构件1205具有比芯棒701更小的CTE。在另一实施方式中,刚性构件1205为构造成使得具有经缠绕复合材料的多个芯棒701放置或堆叠在刚性构件1205内部的多件式工具或铰接工具。此外,一层抗结合层可以放置在部分工具1203a至1203f的外部与刚性构件1205的内部之间以便于将部分工具1203a至1203f放置在刚性构件1205内。在一个实施方式中,每个部分工具1203a至1203f可以由与芯棒701的材料类似的材料制成。每个部分工具1203a至1203f可以包括定尺寸并构造成调整每个部分工具1203a至1203f在固化过程期间热膨胀的孔口1207。
再次参照图6,方法601的步骤609包括向芯棒701施加热量以使芯棒701热膨胀并且在固化期间向复合材料提供期望量的压力。在一个实施方式中,通过使加热的空气流动通过芯棒701的中空部703的长度而以可控制的方式加热芯棒701。芯棒701被调整成使得热膨胀能够在非等温复合固化事件期间在选定的时间提供相对恒定且均匀的压力。固化周期可能需要在比固化温度更低的温度下获得高压力,并且可能需要这种高压力随后在加热至固化温度期间得以保持。芯棒701是压力可调的,使得其随着来自固化周期的热量而被一致地热膨胀,从而施加遍及芯棒701整个长度的均匀压力,直到芯棒701到达相对稳定的压力为止,随后增大的温度使本体部705膨胀到中空部703中,从而减小了外表面707处的压力。因此,当温度增大至固化温度时,复合材料保持在恒定的或近乎恒定的压力下。在完成固化周期之后,在围绕每个芯棒701的未固化复合材料变得坚固地结合至每个相邻的管403时,实现了复合芯401。
仍然参照图6,方法601的步骤611包括冷却芯棒701并从复合芯401移除芯棒701。由于芯棒701具有比复合芯401更大的CTE,因此,对芯棒701的冷却使得芯棒701易于与复合芯401分离。在另一实施方式中,可以通过在中空部703中抽吸真空使芯棒701塌陷来加强芯棒701从复合芯401的移除。
本文中公开的系统和方法包括一个或多个以下优点。例如,本公开的一个优点在于:芯棒是压力可调的,使得芯棒可以调节为在固化周期期间在复合材料上产生期望的压力分布。此外,芯棒构造成使得该芯棒在冷却阶段经历的热收缩量促进芯棒与复合芯分离并从复合芯移除的容易性。本公开的方法允许良好质量复合芯的生产,部分原因是由于芯棒可以调整成向芯的可能期望较大量压力的部分——比如复合芯的节点部分——非对称地提供压力。本公开的方法允许高效地生产复合芯,这可以降低复合芯的成本。
本文中公开的特定实施方式仅是说明性的,这是由于该系统和方法可以进行改型并且可以以对受益于本文中教导的本领域普通技术人员而言明显的不同但相当的方式实施。可以在不脱离本公开的范围的情况下对本文中所描述的系统进行改型、附加、或省略。系统的部件可以是整合的或分开的。此外,系统的操作可以通过更多的、更少的、或其他的部件来执行。
此外,除了如在所附权利要求中描述的以外,不意于对本文中所示出的构造或设计的细节的限制。因此,很明显以上公开的特定的实施方式可以进行改变或修改并且所有这样的变化被认为在本公开的范围和精神内。因此,本文中所寻求的保护范围为如在所附权利要求中提出的。
为了帮助专利局和针对本申请发布的任何专利的任何读者理解所附的权利要求,申请人希望指出,除非在特定的权利要求中明确地使用了措辞“用于……的装置”或“用于……的步骤”,否则申请人无意于使任何所附权利要求援引其申请日时存在的35U.S.C.§112的第6段。
Claims (7)
1.一种制造复合芯的方法,所述方法包括如下步骤:
提供多个芯棒,每个芯棒均包括:
本体部,所述本体部具有外表面,所述外表面限定所述复合芯的管构件的最终形状;以及
中空部,所述中空部限定所述本体部的内表面,所述中空部具有能够在多个压力阶段中塌陷的星形几何结构,所述星形几何结构具有各自终止于一点处的多个平壁腿部,所述多个平壁腿部从内部延伸;
围绕每个芯棒放置复合材料;
将所述多个芯棒放置在工具中,所述工具构造成在所述芯棒经历热膨胀时限制所述多个芯棒;
加热所述芯棒以使所述芯棒热膨胀,从而在固化周期期间向所述复合材料施加压力,加热所述芯棒的步骤包括使所述芯棒的温度增大一段时期,在所述一段时期内的温度的增大导致所述中空部的所述平壁腿部塌陷时的第一压力平稳以及所述内部的直径塌陷时的第二压力平稳;以及
冷却所述芯棒并且将所述芯棒与所述复合芯分离。
2.根据权利要求1所述的方法,其中,围绕每个芯棒放置所述复合材料的步骤包括围绕每个芯棒缠绕所述复合材料。
3.根据权利要求1所述的方法,其中,每个芯棒均具有在径向方向上非线性的热膨胀系数。
4.根据权利要求1所述的方法,其中,每个芯棒均呈六边形形状。
5.根据权利要求1所述的方法,其中,加热所述芯棒以使所述芯棒热膨胀的步骤包括使空气流动通过每个芯棒中的所述中空部。
6.根据权利要求1所述的方法,其中,将所述多个芯棒放置在工具中的步骤包括相邻地堆叠所述芯棒以形成第一管构件,所述第一管构件使另一管构件与所述第一管构件的每个小面表面相邻。
7.根据权利要求1所述的方法,其中,加热所述芯棒以使所述芯棒热膨胀的步骤包括控制所述芯棒的温度以控制由所述芯棒施加在所述复合材料上的压力。
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