Abstract

Grinding tools with superabrasive grains can be manufactured from different bond materials. In several industrial applications, metallic bond systems are used. In general, these show good grain retention and offer a high thermal conductivity, when compared to the other widely used bond types such as vitrified and resin bonds. One drawback of the metallic bond is the lack of pores in the grinding layer. This is caused by the manufacturing processes that are typically used, like brazing or hot pressing. These generally produce very dense layers. The high density and low porosity lead to comparatively little space for the transport of lubricant, coolant, and chips. One approach to eliminate this disadvantage is to introduce cavities into the grinding layer, using the laser powder bed fusion technique (LPBF). In order to evaluate the general suitability of LPBF in combination with the bond material and diamond grains, grinding layer samples with a nickel-titanium bond were produced. The abrasive behavior of these samples was tested in scratch tests on cemented carbide to verify the applicability as grinding tools. While the diamond grains in the powder mixture are not part of the fusion process, they also did not interfere with the manufacturing process, and the scratch tests showed promising abrasive capabilities. The grinding layer itself withstood the process forces, and no grain breakout could be observed. This indicates that the grain retention forces are high enough for the grinding process and that NiTi has a high potential as a bonding material for the manufacturing of grinding tools via LPBF.

中文翻译：

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金属结合磨具的增材制造

摘要

具有超级磨料颗粒的磨具可以由不同的粘结材料制成。在一些工业应用中，使用金属粘结系统。通常，与其他广泛使用的粘结类型（例如玻璃化和树脂粘结）相比，它们显示出良好的晶粒保持力并提供高导热率。金属结合的缺点之一是在研磨层中没有孔。这是由钎焊或热压等常用制造工艺引起的。这些通常会产生非常致密的层。高密度和低孔隙率导致用于运输润滑剂，冷却剂和切屑的空间相对较小。消除此缺点的一种方法是使用激光粉末床熔合技术（LPBF）将空腔引入研磨层。为了评估结合粘合剂材料和金刚石晶粒的LPBF的一般适用性，生产了具有镍钛键的研磨层样品。在硬质合金的划痕测试中测试了这些样品的研磨性能，以验证其作为磨削工具的适用性。尽管粉末混合物中的金刚石晶粒不是熔融过程的一部分，但它们也不会干扰制造过程，并且划痕测试显示出令人满意的研磨性能。磨削层本身承受了加工力，并且没有观察到晶粒破裂。这表明晶粒保持力对于磨削过程而言足够高，并且NiTi作为通过LPBF制造磨削工具的粘结材料具有很高的潜力。