CN117295601A - 用于增材制造的传热装置 - Google Patents
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Abstract
描述了一种用于增材制造的传热装置(100),该装置用于惰性气体(如氮气、氩气等)环境下的工作室内,由多个独立的激光源和LED二极管阵列组成,用于在预设的工作区域内传递电磁辐射。
Description
技术领域
本发明指的是根据权利要求1前序部分所述的用于增材制造的传热装置。尤其是,说明了一种用于采用粉末床熔融或粉末床技术进行增材制造的传热(热传导)装置。
背景技术
增材制造(Additive Manufacturing,AM)是一套以数字模型为起点的增材制造工艺,与传统的减材制造技术(机械加工排屑、切削和钻孔)不同;使用三维CAD模型,通过集成在机器控制系统中的软件或在线服务将模型划分为不同的层,从而获得一个层级方案,该方案将由机床处理,用于不同类型材料(尤其是金属、塑料或复合材料组件)的沉积过程或烧结。
这种技术的主要特点是,它是一种生产工艺,可以根据项目图纸的要求,制造出几何形状与最终部件非常接近的部件。在AM系列中,可以找到一些不同的技术,例如使用激光束对粉末床进行选择性熔化/烧结(选择性激光束熔化-SLBM,或选择性激光束烧结-SLBS,或也称为粉末床熔化-PBF)、通过激光束进行金属沉积(激光束金属沉积-LBMD)和选择性电子束熔化-SEBM。
在粉末床或PBF技术中,激光束被用作高功率密度热源,仅在特定区域或预定区域熔化金属粉末,在这些区域中必须获得用于制造三维部件的致密材料。使用激光束的优势在于,它可以聚焦在小尺寸或小点上,直径通常在30µm左右,因此可以保证高功率密度,从而快速熔化金属粉末,并使待制造部件的表面光洁度达到良好的精度水平。这些特点使粉末床技术得以进入工业市场,用于生产从航空航天到医疗、从汽车到珠宝等不同领域的部件。特别是,与传统生产技术相比,粉末床技术具有极大的灵活性,可以实现非常高水平的部件定制。
在生产过程中,熔融层是通过使用激光源进行的,在某些情况下,激光源的功率不足以熔化粉末层,除非形成缺陷和应力。残留物,从而损害系统的生产率。
制造过程主要取决于辐射与物质的相互作用或材料对电磁辐射能量的吸收特性以及粉末床的温度。其中,材料的吸收特性包括密度、导热系数、比热和发射率等参数,并随材料本身的温度而变化,在粉末床或粉末床熔融的增材制造技术中,这些参数决定了材料的加工过程。
对激光功率、粉末床激光扫描速度、激光束形状和所用材料等工艺参数的选择,会影响到所生产部件的结构和表面质量以及系统的生产率,这对在工业领域使用这类机器起着决定性的作用,尤其是在目前由铸造和/或热成型和/或压铸所覆盖的领域,这也得益于高空间分辨率、毛细管工艺控制以及对粉末床进行预处理和对刚熔化的材料进行后处理的能力等优势。
熔化过程是在工作室内通过一个或多个激光源,借助多个光学和/或扫描系统,在惰性气体(如氮气、氩气等)的环境下进行的。其内部有一些处理装置,可以控制粉末的吸附,从而保证组件的实现,还可以吸走选择性熔化过程中产生的烟雾,并注入气体以支持生产过程。
使用额外的电磁辐射源可以加热将生成最终部件的表面和灰尘,以便使用低功率激光并减少最终部件层内的机械应力。
本领域已知许多用于加热增材制造系统粉末的系统,例如,EP-A1-3010673涉及一种通过熔化粉末层生产部件的装置,其中包括一个在涂覆机中通过微波和/或红外辐射和/或紫外辐射加热粉末的系统。或EP-A1-3200942涉及一个通过微波控制粉末床温度的系统,以调节凝固阶段的热传导;或EP-A1-3285988涉及放置在粉末沉积板下方的辐射系统,用于加热后者;或WO-A1-2019185642涉及一种实现三维物体的方法,其中粉末的凝固过程通过电子束进行,还包括一个辐射源,以减少电子束入射区域内的静电荷n,其中可包括紫外线灯;或WO-A1-2019091801涉及一种辐射系统,该系统带有红外灯,可从下方加热放置粉末的板。
现有技术的主要缺点与系统有关,在这些系统中,装置包括加热装置,加热装置可以在粉末熔化/烧结过程中激活激光束之前、期间工作,但例如不能在激活激光束之后工作,也不能加热工作板的表面层。
此外,这些装置在适合加热板和/或激光金属粉末的光源方面,尤其是在粉末床层的局部加工方面,不易扩展。
发明内容
本发明的目的是通过一种用于增材制造的传热装置来解决上述现有技术的问题,该装置由一个可扩展的系统组成,允许使用多个激光源,这些激光源产生的电磁辐射束沿着预先确定的加工区域分布,能够以一定的自由度在每个主管区域进行操作,保证待制造物体的高质量和高生产率。
本发明的另一个目的是缩短熔化时间,从而提高最终工件的机械性能,缩短生产周期,提高最终产品的质量。
本发明的上述及其他目的和优点,可通过权利要求1所述用于增材制造的传热装置来实现。本发明的优选实施例和非微变型构成了从属权利要求的主题。
应当理解的是,所有所附的权利要求都是本说明书的组成部分。
显而易见的是,正如所附的权利要求书所示,在不脱离本发明范围的情况下,可以对所述内容进行无数的变化和修改(例如与形状、尺寸、排列和具有同等功能的部件有关的变化和修改)。
附图说明
本发明的一些优选实施例将会更好地描述本发明,这些实施例通过非限制性示例的方式提供,并参考附图:
-图1显示了根据本发明设计的用于增材制造的传热装置(100);
-图2显示了根据本发明设计的用于增材制造的传热装置(100)的激光源排列视图;
-图3显示了根据本发明设计的用于增材制造的传热装置(100)的相应工作区域中LED轨迹的侧视图;以及
-图4显示了根据本发明设计的用于增材制造的传热装置(100)的LED的大样图。
具体实施例
用于增材制造的传热装置(100)设计用于惰性气体(如氮气、氩气等)环境下的工作室内,由多个独立激光源和LED二极管阵列组成,设计用于在预设工作区传输电磁辐射束。所述用于增材制造的传热装置(100)可扩展,能够在每个能力范围内独立运行,保证待制造物体的高质量和高生产率。如图1和图3所示,它由一组独立的热源(101)组成,这些热源能够产生热量,并设计用于在工作面(105)的板(104)的预定区域(103)传输电磁辐射束(102),所述独立热源(101)能够通过引入热梯度来改变工作面(105)中所述板(104)的预定区域(103)的温度。所述独立源(101)连接在光学偏转系统(108)的两侧,与光学偏转系统(108)相邻的功率LED阵列(301)能够改变设置在所述工作面(105)中的金属粉末的温度。
有利的是,从图1中可以看出,所述独立光源(101)是可扩展的,可模块化为多个与光学偏转系统(108)相连的系统(201),并根据所述工作面(105)中的工作区域确定大小,以执行增材制造工艺。
此外,从图2中可以看出,所述系统(201)设计有一个或多个激光器,每个激光器都发射一束电磁辐射束(102),能够提高所述板(104)表层和/或所述工作面(105)中金属粉末的温度,这对于降低激光能量以执行增材制造工艺、减少所生产物体的残余应力以及使打印元件的第一熔融层附着在所述板(104)上都是必要的。紫外线辐射预热尤其适用于那些制造平台是相对较薄的金属块,且没有牢固固定在移动轴上的装置,这样就可以有不同的平台用于打印,而无需修改制造体积。
此外,紫外线范围内的波长虽然对所有金属都有利,但尤其适用于铜、金、铝和铂等高反射性材料,因为这些材料的电子结构与铁和/或碳基合金和/或钢等其他材料相比,具有带吸收率偏移到较短波长的特点。
用于增材制造的传热装置(100)配有一组独立的辐射源(101),可发射波长在215nm到600nm之间的电磁辐射(102),所述独立辐射源(101)的单个功率高于50瓦。
此外,有利的是,用于增材制造的传热装置(100)还配备了紫外光-可见光波长范围内的LED阵列(301),该LED阵列相对于所述板(104)的预定区域(103)的倾角为35°,功率大于50W。紫外激光源和LED阵列之间的协同作用可根据待处理金属粉末的类型以及粉末层熔融过程所需的能量,对工作板和/或粉末进行预热和后处理操作。
此外,所述热传导的系统(201)和系统(301)能够以下列相位发射一束电磁辐射(102):
-预热所述板(104)和/或金属粉末;
-增材制造工序,或与加工激光器的电磁辐射同时发射;
-增材制造的后道工序。
有利的是,如图1所示,所述独立光源(101)可以设计成沿X轴和Y轴作旋转运动,这对于在应用增材制造过程中将与所述板(104)的预定区域(103)相邻的工作扇区暴露于所述电磁辐射(102)是必要的。另外,光束整形系统或激光束修改器可使发射的光束适应待加热的表面。
此外,通过所述独立光源(101)和/或相对于所述预定区域(103)倾斜35°的紫外光-可见光波长范围内的LED阵列,在增材制造过程中通过所述电磁辐射(102)照射所述板(104),可以使用低功率激光光源进行增材制造操作,减少残余应力和缺陷,提高加工速度。
根据本发明,用于增材制造的传热装置(100)可以通过外部辐射对建筑平台的上表面进行预热和加热。在此过程中,新沉积的粉末层被预热到低于熔点的高温,然后再用用于熔化粉末的激光对粉末层进行加工。
使用该技术方案的主要优势包括
-预处理,可以用较少的激光能量处理各层;
-后处理,以防止制作的工件受损;
-在激光过程中进行处理,从而缩短周期时间;
-工件固有的热处理;
-减少残余应力和缺陷。
Claims (9)
1.用于增材制造的传热装置(100),包括:
一组独立的紫外线激光源(101),其能够产生热量并设计用于在工作面(105)的所述板(104)的预定区域(103)中传输电磁辐射束(102),所述独立源(101)能够通过引入热梯度来改变所述工作面(105)中所述板(104)的所述预定区域(103)的温度,所述独立源(101)连接到光学偏转系统(108)的两侧;以及
与所述光学偏转系统(108)相邻的紫外线LED阵列(301),其能够改变所述工作面(105)中金属粉末的所述温度。
2.根据权利要求1所述的用于增材制造的传热装置(100),其特征在于,所述独立源(101)是可扩展的,及可模块化为多个与所述光学偏转系统(108)相连的系统(201),并根据所述工作计划(105)中实施增材制造工艺所需的工作区域确定大小。
3.根据权利要求1所述的用于增材制造的传热装置(100),其特征在于,所述系统(201)设计有至少4个激光器,每个激光器发射一束电磁辐射(102),能够提高所述板(104)表层和/或所述工作面(105)中所述金属粉末的温度,这对于降低激光能量以执行增材制造工艺和减少物体产品的残余应力以及使模制元件的第一熔融层附着到所述板(104)上是必要的。
4.根据权利要求1所述的用于增材制造的传热装置(100),其特征在于,所述独立源(101)发出的电磁辐射(102)的波长光谱在215nm到600nm之间。
5.根据权利要求1所述的用于增材制造的传热装置(100),其特征在于,所述独立源(101)的单个功率大于50W。
6.根据权利要求1所述的用于增材制造的传热装置(100),其特征在于,所述紫外光-可见光波长范围内的led(301)阵列相对于所述板(104)的预定区域(103)的倾斜角度为35°,功率大于50W。
7.根据权利要求1所述的用于增材制造的传热装置(100),其特征在于,所述系统(201)在以下步骤中发射一束电磁辐射(102):
对所述板(104)和/或所述金属粉末进行预热;
增材制造工序,或与加工激光器的电磁辐射同时发射;
增材制造的后道工序。
8.根据权利要求1所述的用于增材制造的传热装置(100),其特征在于,所述独立源(101)被设计为沿X轴和Y轴作必要的旋转运动,以便对于在应用增材制造过程中将与所述板(104)的所述预定区域(103)相邻的工作扇区暴露于所述电磁辐射(102)中。
9.根据权利要求1所述的用于增材制造的传热装置(100),其特征在于,在增材制造过程中,通过所述独立光源(101)和/或相对于所述预定区域(103)倾斜35°的紫外光-可见光波长范围内的LED阵列,通过所述电磁辐射(102)照射所述板(104),可以使用低功率激光光源进行增材制造操作,减少残余应力和缺陷,提高加工速度。
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