CN110167696B - 用于持续更新用于增材制造的重涂覆机刀片的方法及装置 - Google Patents
用于持续更新用于增材制造的重涂覆机刀片的方法及装置 Download PDFInfo
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Abstract
本公开大体涉及增材制造系统及方法,涉及到用于馈送期望量的新的重涂覆机刀片的机构。这可以例如通过由线轴卷绕新的刀片材料来完成。这有助于防止当重涂覆机刀片的一部分损坏时停工。如此,本公开还涉及用于检测重涂覆机刀片是否损坏以及如果存在损坏则使得新的刀片部分被馈送的系统及方法。
Description
技术领域
本公开大体涉及一种通过增材制造(包括通过直接金属激光熔化(“DMLM”))来制作零件的方法,以及一种用于执行该方法的装置。
背景技术
德国专利号DE19649865中提供了典型的激光粉末床融合处理的描述,专利整体以引用的方式并入文中。与减材制造方法对比,AM处理大体涉及到一个以上材料的堆积,以制作净形或近净形(NNS)物体。尽管“增材制造”是行业标准术语(ASTM F2792),但是,AM囊括以各种名称已知的各种制造和成型技术,包括自由成形制备、3D打印、快速成型/模具等。AM技术能够由各种材料制备复杂部件。通常,独立物体可以由计算机辅助设计(CAD)模型制备。特定类型的AM处理使用能量引导设备,能量引导设备包含发出能量束(例如电子束或激光束)的能量源,以烧结或熔化粉末材料,生成固态三维物体,其中粉末材料的颗粒结合在一起。使用不同的材料系统,例如工程塑料、热塑性弹性体、金属和陶瓷。激光烧结或熔化是一种值得注意的AM处理,用于快速制造功能原型和工具。应用包括复杂工件的直接制造,用于熔模铸造的型样,用于注塑和压铸的金属模具,以及用于砂铸的模具和型芯。在设计周期期间制造原型物体以增强概念通信和测试是AM处理的其他常见用法。
选择性激光烧结、直接激光烧结、选择性激光熔化和直接激光熔化是常见的行业术语,用以指代通过使用激光束烧结或熔化细粉末来生产三维(3D)物体。例如,通过引用的方式并入文中的美国专利号4,863,538和美国专利号5,460,758描述常规的激光烧结技术。更准确地说,烧结需要在低于粉末材料熔点的温度下融合(聚结)粉末颗粒,而熔化需要使粉末的颗粒充分熔化以形成固态均质物质。与激光烧结或激光熔化关联的物理处理包括向粉末材料热传递然后烧结或者熔化粉末材料。尽管激光烧结和熔化处理可以应用于宽泛范围的粉末材料,但是,生产途径的科学和技术方面(例如烧结或熔化速率以及层制造处理期间处理参数对微观结构演变的影响)还未很好地了解。该制造方法伴随着诸多热、质量和动量传递模式,以及使得该处理非常复杂的化学反应。
图1是示出用于直接金属激光烧结(“DMLS”)或直接金属激光熔化(DMLM)的示范性常规系统100的横截面视图的示意性示图。装置100通过使用由源120产生的能量束136烧结或熔化粉末材料(未示出)以逐层方式构建物体(例如,零件122),源120例如可以是用于生产激光束的激光器,或者,当电流流过它时发出电子的灯丝。要由能量束熔化的粉末通过贮存器126供应并且使用重涂覆机臂116在方向134上行进而均匀地铺展在粉末床112上,以将粉末维持在水平118并且将在粉末水平118上面延伸的多余粉末材料去除到废物容器128。在照射发射引导设备,诸如振镜扫描器132的控制之下,能量束136烧结或熔化正在构建的物体的横截面层。振镜扫描器132例如可以包含多个可移动反射镜或扫描透镜。扫描激光的速度是至关重要的可控处理参数,其影响激光功率施加到特定斑点多长时间。典型的激光扫描速度在每秒10到100毫米的量级上。降低构建平台114,并且将另一粉末层铺展在粉末床和正在构建的物体上,随后通过激光器120连续熔化/烧结粉末。典型地,粉末层例如是10到100微米。重复该处理,直到零件122完全由熔化/烧结的粉末材料构建起为止。
激光器120可以通过包括处理器和存储器的计算机系统控制。计算机系统可以针对每个层确定扫描图案,并且根据扫描图案控制激光器120照射粉末材料。在完成零件122的制造之后,各种后处理流程可以应用于零件122。后处理流程包括通过例如吹气或抽真空来去除多余粉末。其他后处理流程包括应力释放处理。此外,可以使用热学和化学后处理流程来完成零件122。
粉末床常见地用在激光床增材制造技术中。这些技术大体要求在增材制造装置内的构建板上提供薄的粉末层的步骤。在一个示例中,提供粉末分配器201,将一定量的粉末(例如,CoCr)向上推动到构建室中,在构建室中,滚筒或臂202在构建板103上铺展粉末。图1,激光以对应于零件的横截面的所需图案加热粉末,烧结或熔化粉末,以在构建板203上形成固态横截面片。降低构建板,并且粉末分配器和滚筒或臂在构建板上重新分布薄的粉末层。然后,激光加热构建在早先沉积的融合材料的图案上的粉末,以此在增材制造处理中制作连续层。
在构建板上提供薄的粉末层的另一方式是通过连同重涂覆机臂/临时料斗202一起使用的粉末料斗301。图2,通过移动越过构建板并且以受控方式落下粉末以提供薄的粉末层,重涂覆机臂/临时料斗302在构建板303上形成薄的粉末层。在增材制造处理中,伴随每个激光写入步骤以及构建板的降低,重复该处理。
在现有技术中,重涂覆机臂400设置有硬的、单个使用的重涂覆机刀片401。在铺展粉末的处理期间,现有的重涂覆机刀片会因物体中的边缘或突起而损坏,在铺展粉末的处理期间,物体中的边缘或突起会损坏刀片。这要求停止该处理,拆卸损坏的刀片并且更换刀片,这是耗时且费钱的。反之,在铺展粉末的处理期间,现有的重涂覆机刀片会损坏零件,这可能导致显著的浪费。因此,存在对于不易于导致损坏、不易于受到损坏以及如果它损坏则不必需拆卸和更换的重涂覆机刀片的需要。
发明内容
本公开的发明涉及用于通过增材制造(例如通过直接金属激光熔化(“DMLM”))制作期望物体的方法及装置。在本公开的方法的一个实施例中,照射粉末床中的粉末层的至少一部分,以形成物体,通过使重涂覆机臂在粉末床上穿行以提供大致均匀的粉末层,而在粉末床上提供实质上均匀的粉末层,以及,重复该处理,直到期望物体形成为止。重涂覆机臂包含臂部分和在臂部分下面的刀片部分,刀片部分从臂部分突出并且适配成生成大致均匀的粉末层。用于刀片部分的材料例如可以是硅橡胶、塑料或与粉末相同的材料。在本公开的方法的一个方面,在增材制造处理期间,即,在没有停工的情况下,可以馈送新的刀片材料。
在本公开的方法的一个实施例中,分析刀片部分,以确定它是否损坏。在另一方面,分析物体,以确定它是否损坏。如果刀片部分损坏,那么可以馈送新的刀片材料,以更换损坏部分。可以例如通过刀片馈送单元来馈送新的刀片材料。刀片馈送单元的一个示例是放送线轴。
本公开的装置的一个实施例包含在构建板周围的粉末床,能量引导设备,刀片馈送单元,以及具有臂部分和刀片部分的重涂覆机臂。通过非限制性示例的方式,能量引导设备可以是激光器或电子束装置,诸如电子枪。刀片部分材料可以是适合于通过DMLM制作物体的任何材料,通过非限制性示例的方式,材料可以是硅橡胶或塑料。在本公开的装置的一个方面,该装置包含放送线轴。放送线轴包含新的刀片材料。该装置还可以包含用于收集用过的刀片材料的刀片接收单元。在本公开的装置的一个实施例中,该装置包含用于确定刀片部分是否损坏的系统。在本公开的装置的一个实施例中,该装置包含用于确定物体是否损坏的系统。
附图说明
图1是含有根据现有技术通过增材制造处理制作的物体的粉末床。
图2是使用重涂覆机臂以水平方式在构建板上分布粉末的常规粉末床增材制造处理的示意性视图。
图3是使用料斗在构建板上分布粉末的常规增材制造装置的示意性视图。
图4是具有根据现有技术的重涂覆机刀片的重涂覆机臂的图示。
图5是具有根据本发明实施例的臂部分和刀片部分以及拾取/放送线轴的重涂覆机臂的图示。
图6是含有根据本发明实施例通过增材制造处理制作的物体的粉末床。
具体实施方式
下面与附图一同阐述的详细描述意在作为各种配置的描述,而不意在表示可以实践文中描述的概念的唯一配置。
在一个实施例中,本发明涉及通过增材制造制作期望物体的方法,包括下述步骤:通过利用包含臂部分和刀片部分的重涂覆机臂铺展粉末,在构建板上分布粉末的一部分;聚焦能量束,以制作融合区;重复,直到期望物体形成为止;以及,在该处理期间,馈送新的刀片材料至少一次。优选地,粉末是金属合金、聚合物或陶瓷粉末。未使用的粉末可以收集在粉末接收器中,并且视所需而再循环。可以例如通过经由料斗沉积粉末来提供粉末的一部分。聚焦能量束的步骤可以利用例如激光器或电子束装置(诸如电子枪)来达成。
在一个实施例中,本发明涉及通过增材制造制作期望物体的方法,包括:通过利用包含臂部分和刀片部分的重涂覆机臂铺展粉末,在构建板上分布粉末的一部分;聚焦能量束,以制作物体;馈送新的刀片材料;以及,重复,直到期望物体形成为止。比如,馈送新的刀片材料可以通过使用放送线轴和/或拾取线轴将新的刀片材料卷绕到重涂覆机臂中来达成。在一个方面,本公开的方法包括,检查物体或是刀片是否损坏。在另一方面,如果刀片部分损坏,则将新的刀片材料馈送到重涂覆机臂中。在另一方面,可以视所需而收集用过的刀片材料。比如,可以通过将刀片材料沉积在刀片材料接收器中,或者通过将刀片材料收集在拾取线轴中,来收集刀片材料。检查刀片或物体是否损坏的步骤可以通过能够检查刀片或物体的任何手段(比如,使用相机)来执行。相机可以将数据传递到计算机。
在一个实施例中,本发明涉及一种用于通过增材制造制作期望物体的装置,包含在构建板周围的粉末床区域,能量引导设备,具有臂部分和刀片部分的重涂覆机臂,以及刀片材料馈送单元。刀片部分可以由材料诸如硅橡胶、塑料或者适合于通过DMLM制作物体的材料制作。能量引导设备例如可以是激光或电子束。刀片材料馈送单元例如可以是放送线轴。该装置可以进一步包含刀片材料接收单元。刀片材料接收单元例如可以是拾取线轴或刀片材料接收器。
在一个实施例中,本发明涉及一种用于通过增材制造制作期望物体的装置,包含在构建板周围的粉末床区域,能量引导设备,用于检查重涂覆机刀片或是零件是否损坏的系统,以及具有臂部分和刀片部分的重涂覆机臂。用于检查重涂覆机刀片或是零件是否损坏的系统可以是能够视觉上检查重涂覆机刀片或零件的任何系统(比如,相机)。相机可以将数据传递到计算机。
图1示出用于DMLM 100的示范性现有技术系统。通过以物体的层的形状烧结或熔化粉末材料来逐层构建零件122。使用由能量源(诸如激光器120)产生并且由振镜扫描器132控制的能量束136来执行烧结或熔化。要由能量束熔化的粉末通过贮存器126供应,然后使用重涂覆机臂116在方向134上行进而均匀地铺展在构建板114上,以将粉末维持在水平118并且将在粉末水平118上面延伸的多余粉末材料去除。多余粉末材料的一些沉积在废物容器128中。然后降低构建板114,并且将另一粉末层铺展在构建板和正在构建的物体上,通过激光器120熔化或烧结粉末材料,并且重复该处理,直到零件122完成为止。
图2示出根据现有技术用于增材制造的粉末床。提供粉末分配器201,粉末分配器201将一定量的粉末(例如,CoCr)向上推动到构建室中,在构建室中,滚筒或臂202在构建板203上铺展粉末。激光以对应于零件的横截面的期望图案加热粉末,烧结或熔化粉末,以在构建板203上形成固态横截面片。降低构建板,并且粉末分配器和滚筒或臂在构建板上重新分布薄的粉末层。然后,激光加热构建在早先沉积的融合材料的图案上的粉末,以此在增材制造处理中制作连续层。
图3示出根据现有技术用于增材制造的粉末床和重涂覆机系统。粉末料斗301连同重涂覆机臂/临时料斗302一起使用。通过移动跨越构建板并且以受控方式落下粉末以提供薄的粉末层,重涂覆机臂/临时料斗302在构建板303上形成薄的粉末层。在增材制造处理中,伴随每个激光写入步骤以及构建板的降低,重复该处理。
图4示出根据现有技术在增材制造处理中使用的重涂覆机臂。存在具有单个使用的重涂覆机刀片401和粉末402的重涂覆机臂400。
图5示出根据本发明实施例的具有重涂覆机臂501和持续馈送的重涂覆机刀片502的重涂覆机系统500。图5中的重涂覆机系统具有放送线轴503和拾取线轴504。重涂覆机刀片502在方向505上被馈送。重涂覆机刀片502在方向506上移动,以提供大致均匀的粉末层。
图6示出根据本发明实施例的具有持续馈送的重涂覆机刀片的示范性增材制造系统。通过以物体的层的形状烧结或熔化粉末材料来逐层构建零件622。使用由能量源(诸如激光器620)产生并且由振镜扫描器632控制的能量束636来执行烧结或熔化。要由能量束熔化的粉末通过贮存器626供应,然后使用具有持续馈送的重涂覆机刀片的重涂覆机臂616在方向634上行进而均匀地铺展在构建板614上,以将粉末维持在水平618并且将在粉末水平618上面延伸的多余粉末材料去除。多余粉末材料的一些沉积在废物容器628中。然后降低构建板614,并且将另一粉末层铺展在构建板和正在构建的物体上,通过激光器620熔化或烧结粉末材料,并且重复该处理,直到零件622完成为止。还存在附接到重涂覆机臂的相机638,相机638能够将数据传递到计算机640,这允许检测物体或持续馈送的重涂覆机刀片是否损坏。
Claims (19)
1.一种用于制造期望物体的方法,其特征在于,包含:
(a)使包括持续馈送的重涂覆机刀片的重涂覆机臂在粉末床上穿行,以在所述粉末床上提供粉末层;
(b)照射所述粉末床中的所述粉末层的至少一部分,以形成物体的融合区;以及
(c)重复步骤(a)和(b),直到所述期望物体在所述粉末床中形成为止,其中,所述重涂覆机臂包含重涂覆机刀片,所述重涂覆机刀片包括刀片部分和馈送部分,所述刀片部分沿着所述重涂覆机臂的长度的至少一部分,所述馈送部分馈送到所述重涂覆机臂,更换所述重涂覆机刀片的所述刀片部分;以及
(d)将所述持续馈送的重涂覆机刀片的沿着所述重涂覆机臂的长度的至少一部分的新的刀片部分从刀片馈送单元馈送至所述重涂覆机臂,从而利用所述新的刀片部分更换所述持续馈送的重涂覆机刀片的刀片部分;
其中,所述用于制造期望物体的方法进一步包括经由相机检测所述刀片部分是否损坏,所述相机附接到所述重涂覆机臂。
2.如权利要求1所述的用于制造期望物体的方法,其特征在于,其中,馈送新的刀片部分发生在形成所述物体之前、期间或之后。
3.如权利要求1所述的用于制造期望物体的方法,其特征在于,其中,所述刀片部分由硅橡胶制成。
4.如权利要求1所述的用于制造期望物体的方法,其特征在于,其中,所述刀片部分由塑料制成。
5.如权利要求1所述的用于制造期望物体的方法,其特征在于,其中,所述刀片部分由与所述粉末相同的材料制成。
6.如权利要求1所述的用于制造期望物体的方法,其特征在于,包含如果所述刀片部分损坏,则馈送新的刀片部分。
7.如权利要求1所述的用于制造期望物体的方法,其特征在于,其中,馈送新的刀片部分通过卷绕所述新的刀片部分来完成。
8.如权利要求7所述的用于制造期望物体的方法,其特征在于,其中,卷绕所述新的刀片部分使用至少一个放送线轴单元来完成。
9.如权利要求7所述的用于制造期望物体的方法,其特征在于,其中,卷绕所述新的刀片部分使用至少一个拾取线轴单元来完成。
10.如权利要求1所述的用于制造期望物体的方法,其特征在于,其中,所述刀片部分沿着所述重涂覆机臂的整个长度。
11.一种执行如权利要求1所述的用于制造期望物体的方法的装置,其特征在于,包含:
粉末床区域,所述粉末床区域在构建板周围;
能量引导设备;
重涂覆机臂,所述重涂覆机臂包含臂部分和具有刀片部分的持续馈送的重涂覆机刀片,其中,所述刀片部分在所述臂部分下面并且从所述臂部分突出;
粉末分配单元;
刀片馈送单元,所述刀片馈送单元包含刀片材料;以及
用于检测所述刀片部分是否损坏的相机,所述相机附接到所述重涂覆机臂。
12.如权利要求11所述的装置,其特征在于,其中,所述刀片部分由适合于经由直接激光金属熔化增材制造来制作零件的材料制成。
13.如权利要求11所述的装置,其特征在于,其中,所述刀片馈送单元是放送线轴。
14.如权利要求11所述的装置,其特征在于,其中,所述刀片馈送单元包含新的刀片材料。
15.如权利要求11所述的装置,其特征在于,其中,进一步包含刀片接收单元。
16.如权利要求15所述的装置,其特征在于,其中,所述刀片接收单元是拾取线轴。
17.如权利要求15所述的装置,其特征在于,其中,所述刀片接收单元是接收器。
18.如权利要求11所述的装置,其特征在于,其中,所述粉末分配单元是料斗。
19.如权利要求11所述的装置,其特征在于,其中,所述装置还包含计算机。
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JP6845336B2 (ja) | 2021-03-17 |
US20220023952A1 (en) | 2022-01-27 |
EP3568247B1 (en) | 2024-03-27 |
EP3568247A4 (en) | 2020-10-07 |
US11801633B2 (en) | 2023-10-31 |
US20180200964A1 (en) | 2018-07-19 |
CN110167696A (zh) | 2019-08-23 |
JP2020504036A (ja) | 2020-02-06 |
EP3568247A1 (en) | 2019-11-20 |
WO2018132204A1 (en) | 2018-07-19 |
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