Abstract: Two technical routes for the additive manufacturing of cemented carbide cutting tools were reviewed: the powder bed fusion  route based on thermal forming, and the forming-debinding-sintering based on cold printing of  green bodies, followed by debinding and sintering. The powder bed fusion technique might produce cemented carbide cutting tools with near-theoretical density, but issues such as porosity, cracking, decarburization and cobalt evaporation remained. By adjusting parameters such as laser energy density, scanning speed, and powder characteristics, the quality of the printed components might be significantly improved. The forming-debinding-sintering technique might produce cutting tools with excellent surface quality and superior mechanics properties, but challenges such as binder residue and component shrinkage persisted. By optimizing key parameters such as binder type, debinding process, and sintering temperature, the density and mechanics properties of the components might be enhanced. Additionally, heat treatment processes such as vacuum sintering, hot pressing, and hot isostatic pressing might further eliminate internal defects in the materials, thereby improving the overall performance of the cutting tools. 

Key words: cutting tool, cemented carbide, additive manufacturing, powder bed fusion technology, forming-debinding-sintering technology

摘要： 综述了增材制造硬质合金刀具的两类技术路线：基于热成形的粉末床熔融技术路线和基于生坯冷打印、脱脂和烧结工艺的冷沉积烧结技术路线。粉末床熔融技术能够制备出接近理论密度的硬质合金刀具，但存在孔隙、裂纹、脱碳以及钴蒸发等问题，通过调整激光能量密度、扫描速度和粉末特性等参数能够显著改善打印件的质量；冷沉积烧结技术能够制备出表面质量优良且力学性能优异的硬质合金刀具，但存在黏结剂残留、制件收缩等问题，通过优化黏结剂种类、脱脂工艺和烧结温度等关键参数可以提高制件的密度和力学性能。同时采用真空烧结、热压、热等静压等热处理工艺能够进一步消除材料内部缺陷，提高刀具整体性能。

关键词: 刀具, 硬质合金, 增材制造, 粉末床熔融技术, 冷沉积烧结技术