Innovations in repair and fabrication of cutting tools using automated laser cladding

使用自动激光熔覆修复和制造切削工具的创新

• 批准号: 319806-2005
• 负责人: Khajepour, Amir
• 金额: $ 2.7万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=365335
• 关键词: Innovations; repair; fabrication; cutting; tools

The price of tungsten has gone up by about 300% since 2004 (The Economist, April 14th 2005). This increase in price is expected to continue due to a huge demand from developing countries (China alone uses more than 30% of world tungsten production) and the lack of  new opencast mines discoveries in the world. Good quality WC tools are usually used for 400 cutting tasks before they need to be resharpened. The number of resharpening steps depends on the features of the tools and it is very limited for special tools built for machining of high volume parts. After the maximum number of resharpening, the tool is scrapped although a few millimeters addition to its length can save $300-$400 worth of tool. In many cases a cutting tool is scrapped because of small manufacturing errors or the presence of small chips.   In this project, laser cladding is used to develop a new technique to repair WC cutting tools. In addition, cladding of tungsten-carbide on non-WC substrates such as alloy steel will be studied to develop new low-cost steel tools with WC cutting edges. Furthermore, fabrication of diamond and cermet tools using laser cladding will be investigated. The applicants state of the art lab facilities which include a 1000 W ND:YAG laser, powder feeders, 4-axis positioning table, and vision system for monitoring and control of  the clad will be utilized in the project. The requested funding will primarily be used to support graduate students and one post-doctoral fellow.

自2004年以来，钨的价格上涨了约300%（经济学人，2005年4月14日）。由于发展中国家的巨大需求（仅中国就使用了世界钨产量的30%以上）以及世界上缺乏新的露天矿发现，预计价格将继续上涨。质量好的WC刀具通常用于400次切削任务，然后才需要重新磨刀。重磨步骤的数量取决于刀具的特性，对于为加工大批量零件而制造的专用刀具来说，重磨步骤非常有限。在最大数量的重新锐化后，刀具被废弃，尽管其长度增加几毫米可以节省价值300 - 400美元的刀具。在许多情况下，由于小的制造误差或小碎片的存在，切割工具被废弃。 本课题利用激光熔覆技术开发了一种新的WC刀具修复技术。此外，还将研究在合金钢等非碳化钨基体上覆层碳化钨，以开发新型低成本碳化钨刀具。此外，利用激光熔覆技术制造金刚石和金属陶瓷工具也将被研究。申请人最先进的实验室设施，包括1000 W ND：YAG激光器、送粉器、4轴定位台和用于监测和控制熔覆的视觉系统，将用于该项目。申请的资金将主要用于支持研究生和一名博士后研究员。