Laser Surface Textured Cemented Carbides for Application in Abrasive Machining Processes

激光表面织构硬质合金在磨料加工过程中的应用

• 批准号: 425923019
• 负责人: Dr.-Ing. Shiqi Fang
• 金额: --
• 依托单位: Lehrstuhl für Fertigungstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/425923019?language=en
• 关键词: Laser; Surface; Textured; Cemented; Carbides

Cutting effectiveness of abrasive tools is directly related to their intrinsic surface topography resulting from the abrasive grains protruding out of the tool surfaces. The fundamental concept of this project inherits from the study of the behavior of single abrasive grains in the abrasive machining processes. However, it is not easy to exclude the influences of other adjacent abrasive grains on the associated cutting surfaces. Therefore, it is meaningful to conceive an approach to isolate or fabricate single grains on the tool cutting surface. In this regard, the use of more conventional hard materials, e.g. cemented carbide, might be proposed as alternative for expensive tool materials, as long as the surface topography features of current abrasive tools can be replicated at the corresponding length scales and the mechanical properties can also meet such cutting requirements. In a previous study of abrasive tools (CBN honing stone as example), topographical features of the cutting surfaces, especially the geometry and distributions of the protruding grains were statistically characterized. Surface topography of the novel cemented carbide tools will be conceived and designed based on the results of the previous study. Subsequently, these geometrical features will be replicated on cemented carbides using the advanced laser surface texturing (LST) technology. Results of previous fundamental research of laser-matter reaction mechanism are the base for LST process design, to obtain high geometrical precision, to improve surface integrity and to avoid surface damage. Afterwards, mechanical properties of these novel tools shall be enhanced through coating technology. The compatibility of the coatings on the laser machined surfaces shall be studied and improved. Finally, performance of the new tools will be validated and compared with traditional abrasive tools by various implementations, including cutting tests, tribological tests and investigations of mechanical properties.

磨料工具的切削效率与工具表面突出的磨料颗粒所形成的固有表面形貌直接相关。该项目的基本概念来自于对磨料加工过程中单个磨粒行为的研究。然而，这是不容易排除的影响，其他相邻的磨料颗粒上的相关的切削表面。因此，研究一种在刀具切削表面分离或制造单颗粒的方法具有重要意义。在这方面，可以提出使用更传统的硬质材料（例如，硬质合金）作为昂贵工具材料的替代，只要当前研磨工具的表面形貌特征可以在相应的长度尺度下复制并且机械性能也可以满足这样的切割要求。在以前的研究磨料工具（CBN珩磨石为例），切削表面的形貌特征，特别是突出的颗粒的几何形状和分布的统计特征。本文将在前人研究成果的基础上，对新型硬质合金刀具的表面形貌进行构思和设计。随后，这些几何特征将使用先进的激光表面纹理（LST）技术在硬质合金上复制。激光与物质反应机理的基础研究成果为激光表面成形工艺设计、获得高几何精度、改善表面完整性和避免表面损伤提供了基础。然后，通过涂层技术提高这些新型工具的机械性能。应研究和改进激光加工表面涂层的相容性。最后，通过切削试验、摩擦学试验和力学性能研究等多种手段，对新型刀具的性能进行了验证，并与传统磨具进行了比较。