Application of Cryogenic Treatment to Enhance the Tool life of the TiAlN Coated Tungsten Carbide Milling Cutter

• Main Authors: Wu, Jui-Hsiang, 吳瑞祥
• Other Authors: Hsiung, Jen-Chou
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/5h5n78

碩士 === 正修科技大學 === 機電工程研究所 === 107 === Cutting tools are important to manufacturing industry and affect production efficiency, quality and part accuracy. Tungsten carbide is one of the most commonly used in cutting tools. TiAlN is often coated on the cutting tool because it has high wear resistance and high temperature oxidation resistance. Cryogenic treatment has been widely used in tools, cutting tools and mold industry, etc., which can improve material properties by decreasing residual stress, stabilizing dimensional accuracy and increasing the wear resistance. The purpose of this study is to discuss the feasibility of cryogenic treatment to improve the TiAlN tungsten carbide milling cutter life for cutting the Inconel 625. Tool life test results exhibit that, without cryogenic treatment, chip and wear with the largest range exist in cutter tools. However, with cryogenic treatment, the wear range is narrow and no chipping. These verify that cryogenic treatment can enhance life of tungsten carbide milling cutter. According to the XRD result, the residual stress is less after cryogenic treatment. The optical microscope and scanning electron microscope (SEM) results indicate that after cryogenic treatment, the microstructure is denser and the adhesion of coating and tungsten carbide is better. From the above test results, it is shown that the service life of TiAlN coated milling cutter after cryogenic treatment can be effectively improved due to the denser microstructure、less residual stress and better adhesion.