CN102076482A - 用于逐层制造三维物体的装置 - Google Patents
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Abstract
一种通过激光器(7)或其它的能量源的作用在与待制造物体(3)在相应层中的横截面对应的位置上逐层涂敷并硬化粉末状建造材料(3a)从而制造三维物体(3)的装置,包括加热或冷却部件(22),用于提供或抽走逐层涂敷的建造材料(3a)的热量,提供了具有很强各向异性导热能力的中间层(23)用于平整温度分布。
Description
技术领域
本发明涉及一个用于逐层制造三维物体的装置,尤其涉及一种通过提供能量在与待制造物体在相应层中的横截面对应的位置上逐层硬化建造材料从而制造三维物体的装置。
背景技术
DE4300478 C1公开了一个名为“选择性激光烧结”的公知方法,该方法通过在与物体相应横截面对应的位置上连续地硬化粉末状的、通过电磁辐射能够硬化的建造材料的层从而制造三维物体;同时还公开了一种用于实施这种方法的装置。在已知的设备中,待建物体在一个作为装置一部分的金属平台上被建造。
DE29624498建议,在平台上设置一个预制的平板,该平板可以与位于其上的完成的物体一起被抽走。平台包含冷却通道,用于安置导流冷却水的铜管。
此外还有其它的文档设计了建造空间或建筑平台的加热装置。例如,DE10108612 C1中公开了一种选择性激光烧结的装置,其中建造空间由外壳加热装置保围。另外还可以设计一种底面加热装置。
在加热或冷却用于在其上建造三维物体的平台时,出现一个问题,即平台表面的温度分布不均匀。因此例如可能出现在提供热量时达到局部的温度峰值,该温度峰值会对粉末层的质量以及过程状态(例如熔化、烧结、卷曲和弄弯)造成负面的影响。
发明内容
因此本发明的任务在于,提供一种用于逐层制造三维物体的装置,使用该装置使粉末层的质量以及过程状态得到改善。
本发明任务通过权利要求1所述的装置得到解决,从属权利要求中给出了本发明的其他改进。
支架上面的温度分部通过具有很强的各向异性导热能力的中间层得以平整,从而避免达到温度峰值。通过这种方法,粉末层的质量以及装置的过程状态得到改善。通过恰当地选择所用的材料和中间层的厚度可以有针对性地影响效果的强度。
附图说明
结合附图,从具体实施方式的描述中能得出本发明其它的特征和优点。
图1为用于逐层制造三维物体的装置的截面图;
图2为根据本发明的第一实施例,包含在图1所示装置中的支架的截面图。
具体实施方式
下面,参照附图描述根据本发明的第一实施例用于制造三维物体的装置。
图1中激光烧结装置具有具有一个向上开口的容器1,该容器1内具有可在垂直方向上运动的支架2,支架2承载待建造物体3并定义了建造区域。支架2在垂直方向上如此设置,使得物体的待硬化的每一层都位于由工作台4的表面形成的工作面,该工作台4在容器1的范围内具有一个开口。进一步的,设置涂层器5用于涂敷可以通过电磁辐射硬化的粉末状建造材料3a。建造材料3a从储备容器6中引至涂层器5。该装置进一步具有一个生成激光射线7a的激光器7,激光射线7a通过转向装置8被转向至耦合窗口9并从该窗口进入过程室10并且聚焦到工作面4的一个预定的点上。
进一步,设置一个控制单元11,通过该控制单元11以协调的方式控制装置的构件以实施建造过程。
由图2可最明显的看出,支架2包含一个支架平台20,优选地由金属制造,以及一个盖板21,同样优选地由金属制造。在支架平台20和盖板21之间设置一个加热部件22。在加热部件22和盖板21之间设置中间层23,例如由具有很强的各向异性导热能力的材料制成的薄膜或板。
为此,具有很强的各向异性导热能力的材料如此设置,使得导热能力在平行于支架2的表面的方向(在层方向)上明显要大于其在垂直于支架2的表面的方向(垂直于层方向)上。中间层23例如可以是石墨薄膜或有多层薄膜结构的石墨板,例如石墨薄板。
优选地,在室温情况下材料的导热能力在层方向上是其垂直于层方向上的至少5倍,在进一步优选的方式中至少为10倍,在更进一步优选的方式中至少为20倍。
运行该设备时,第一步将支架2移动到使它的上表面比工作面4低一个层的厚度的位置。然后利用涂层器5将材料3a的第一层涂敷到支架2上并进行平整。接着,控制单元11如此控制转向装置8,使得经过转向的激光射线7a有选择地击中材料3a的层的应硬化的位置。因此,材料在这些位置上被硬化或者烧结。
在下一步中,支架2下降了下一层的高度并且重新利用涂层器5涂敷并平整第二材料层,并且利用激光射线7a有选择地硬化。涂敷材料层、平整以及硬化等步骤重复实施,直到待制造物体3完成。
在使用塑料作为建造材料时,利用具有很强各向异性导热能力的中间层引起支架上表面温度分布得以平整显得尤其有利。利用根据本发明的中间层避免了可能导致建造材料熔化的局部的温度升高。
具有很强各向异性导热能力的中间层还可以用于使用金属粉末的情况。一般说来,在通过逐层硬化建造材料从而制造三维物体时,如果均匀的温度分配是有利的,那么就能应用本发明。
在本发明的第二个实施例中,在支架容器1的侧壁而不是支架内设置加热部件,目的在于从边上为建造材料提供热量。
同样在该实施例中,具有很强各向异性导热能力的中间层如此在容器侧壁上或在容器侧壁中设置,使得导热能力在层方向上(即平行于容器侧壁表面)明显大于其在垂直于层方向上(即垂直于容器侧壁表面)。
然而区别于第一实施例,具有很强各向异性导热能力的中间层并不是位于加热部件和建造材料之间,而是位于加热部件的与建造材料相对的侧上。由于通常为了加热容器侧壁要使用分散设置的加热部件,因此可以同样在加热部件之间的区域内实现好的温度平衡。另一方面,将具有很强各向异性导热能力的中间层设置在加热部件的与建造材料相对的侧上提供了一个优势,即改进了的向外的绝缘。
本实施例的特性高可以与第一实施例中的特性相结合或者相对应地进行替换。所以例如支架2和容器1的侧壁都可以分别设置加热部件或者具有很强各向异性导热能力的层。在支架2和容器1的侧壁处,具有很强各向异性导热能力的层可以分别设置在加热部件和建造材料之间或在加热部件的与建造材料相对的侧上。
本发明不限于所描述的实施例。例如,还可以设置冷却部件以替代加热部件。
加热部件或冷却部件以及具有很强各向异性导热能力的中间层可以安装在支架或者容器侧壁的任意位置。
具有很强各向异性导热能力的中间层可以固定地或可移动地安装在支架或者容器侧壁处,或者支架或容器侧壁本身可以由具有很强各向异性导热能力的材料构成。
具有很强各向异性导热能力的中间层可以安装在支架的整个横截面上或者只是在可选择的确定的位置上,例如在加热部件和支架边缘区域之间。由此可以改善对这些否则将会供应不足的区域的热量供应。
具有很强各向异性导热能力的中间层还可以是可移动地安装的预制板的一部分,该板被放置于支架之上并且物体将在该板上被建造。
同样在容器侧壁处,具有很强各向异性导热能力的中间层可以安装在整个侧壁表面上或者只是在容器侧壁上可选择的确定的位置上。
安装加热部件或冷却部件以及具有很强各向异性导热能力的中间层的位置不限于在上述实施例中提及的示例。例如,它们还可以安装在工作台4的整个表面或者其表面的一部分上。
在所有的情况下,具有很强各向异性导热能力的材料被如此选择和设置,如上述在实施例中描述的,使得导热能力在层方向上(即平行于支架或容器侧壁表面)明显大于其在垂直于层方向上(即垂直于支架或容器侧壁表面)。
Claims (14)
1.一种通过激光器(7)或另一能量源的作用在与待制造物体(3)在相应层中的横截面对应的位置上逐层涂敷并硬化粉末状建造材料(3a)从而制造三维物体(3)的装置,包括
加热或冷却部件(22),所述加热或冷却部件向逐层涂敷的建造材料(3a)供应热量或从逐层涂敷的建造材料(3a)吸收热量,
其特征在于,提供具有强各向异性的导热能力的中间层(23)。
2.根据权利要求1所述的装置,其中所述具有强各向异性的导热能力的中间层设置于所述加热或冷却部件(22)与所述建造材料(3a)之间。
3.根据权利要求1所述的装置,其中所述具有强各向异性的导热能力的中间层设置于所述加热或冷却部件(22)的与所述建造材料(3a)相对的侧上。
4.根据权利要求1至3中任一项所述的装置,
还具有支架(2),在所述支架(2)上能涂敷所述粉末状建造材料(3a)的层从而建造所述物体(3),
其中所述加热或冷却部件(22)以及所述具有强各向异性的导热能力的中间层(23)设置于所述支架(2)上。
5.根据权利要求1至4中任一项所述的装置,其中所述加热或冷却部件以及所述具有强各向异性的导热能力的中间层设置于容器(1)的侧壁处,所述容器在旁侧对所述建造材料(3a)进行限制。
6.根据权利要求1至5中任一项所述的装置,其中所述加热或冷却部件以及所述具有强各向异性的导热能力的中间层设置于工作台(4)上,所述工作台(4)形成用于涂敷和硬化所述建造材料(3a)的工作面。
7.根据权利要求1至6中任一项所述的装置,其中所述中间层(23)的导热能力在层方向上明显大于垂直于层方向的方向上。
8.根据权利要求1至7中任一项所述的装置,其中在室温情况下所述中间层(23)的导热能力在层方向上是垂直于层方向的方向上的至少5倍,优选为至少10倍,进一步优选为至少20倍。
9.根据权利要求1至8中任一项所述的装置,其中所述中间层(23)是由具有强各向异性的导热能力的材料制成的薄膜或板。
10.根据权利要求1至9中任一项所述的装置,其中所述中间层(23)是石墨薄膜或具有多层薄膜结构的石墨板。
11.根据权利要求1至10中任一项所述的装置,其中所述中间层(23)在所述支架(2)的整个横截面上或者在所述容器(1)的整个侧壁面上或者在所述工作台(4)的整个表面上延伸。
12.根据权利要求1至10中任一项所述的装置,其中所述中间层(23)仅在所述支架(2)的横截面的一部分上或者在所述容器(1)的侧壁面的一部分上或者在所述工作台(4)的表面的一部分上延伸。
13.根据权利要求1至12中任一项所述的装置,其中所述中间层(23)为所述支架(2)或者所述容器(1)的侧壁或者所述工作台(4)的组成部分。
14.根据权利要求1至13中任一项所述的装置,其中所述中间层(23)是被放置于所述支架(2)上的板的组成部分,其中应当在所述板上建造所述物体(3)。
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PCT/EP2009/004725 WO2010000448A2 (de) | 2008-07-03 | 2009-06-30 | Vorrichtung zum schichtweisen herstellen eines dreidimensionalen objekts |
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EP (1) | EP2291281B1 (zh) |
JP (1) | JP5746024B2 (zh) |
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CN103056365A (zh) * | 2011-10-21 | 2013-04-24 | 普拉特及惠特尼火箭达因公司 | 大零件建造体的添加制造管理 |
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CN104015357B (zh) * | 2014-05-30 | 2016-03-23 | 田野 | Fdm 3d打印冷板成型树脂膜 |
CN104589654A (zh) * | 2015-01-30 | 2015-05-06 | 珠海天威飞马打印耗材有限公司 | 三维打印机 |
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CN107427922A (zh) * | 2015-11-13 | 2017-12-01 | Cl产权管理有限公司 | 用于仓储模块式的功能单元的设备 |
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CN110370628A (zh) * | 2018-04-13 | 2019-10-25 | Cl产权管理有限公司 | 用于添加式地制造至少一个三维物体的方法 |
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DE102008031587A1 (de) | 2010-01-07 |
JP2011526222A (ja) | 2011-10-06 |
JP5746024B2 (ja) | 2015-07-08 |
WO2010000448A2 (de) | 2010-01-07 |
EP2291281A2 (de) | 2011-03-09 |
EP2291281B1 (de) | 2012-06-27 |
US8525071B2 (en) | 2013-09-03 |
WO2010000448A3 (de) | 2010-08-05 |
US20100012630A1 (en) | 2010-01-21 |
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