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An Altenative method of Coating Carbide Tods (Lengthening the Life of Coated Carbide Tods Subiect to Vibration during High Speed Cutting)

涂层硬质合金 Tods 的替代方法（延长高速切削过程中受到振动的涂层硬质合金 Tods 的寿命）

基本信息

批准号：
60460089
负责人：
FUJI Hiroshi
金额：
$ 4.8万
依托单位：
GIFU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60460089/
关键词：
High Speed Heary Uty Cutting Anti-Shoch Ted Rabe Exposing(oating Ceramic Coated Carbide Tool Life Test

项目摘要

The authors found out in the first two yeard after the Grant-in-Aid for Scientific Research had started helping this research project that the life of cemented carbide tools coated with ceramics is significantly lengthened by exposing the carbide substrate as a narrow band along the cutting edge on the rake face. In this year, practical industrial methods to expose the narrow band in industry were discussed. Two exposing methods were attempted. One was to grind off the ceramic coating at the edge by inclined surface grinding. The other was to remove the ceramics by honing so that a round substrate edge with a controlled radius was formed. Tools made by both methods were tested by intermittent high speed cuttings.The following results were obtained.(1) For the first method it was found by varying the inclined angle from 0゜ to 45゜ that tool life reached a sharp peak when the exposed part is inclined by 16゜.(2) The second method to expose the substrate at the cutting edge was found to be very effective to extend the tool life. When the height of exposed rake and width of exposed band were made within 12 to 22 <micrn>m and within 70 to 90<micrn> m,respectively, the tool life was lengthened 6 times to 9 times longer than that of conventional tools.(3) To discover why these methods were able to improve performance, the propagation of cracks was traced by SEM and temperature distrbution was measured. Although there was no difference between Rex tool and conventional tool in temperature distribution, there was a great differece between them in the process of tool failure.

作者在科学研究补助金开始帮助这一研究项目后的头两年发现，陶瓷涂层硬质合金刀具的寿命显著延长，因为硬质合金基体作为沿着前刀面上的切削刃的窄带暴露。在这一年中，讨论了在工业中暴露窄带的实用工业方法。尝试了两种暴露方法。一种是通过倾斜表面研磨来磨掉边缘处的陶瓷涂层。另一种是通过珩磨去除陶瓷，从而形成具有受控半径的圆形基底边缘。用这两种方法制造的刀具进行了间歇高速切削试验，得到了以下结果。(1)对于第一种方法，通过将倾斜角从0 °变化到45 °，发现当暴露部分倾斜16 °时，刀具寿命达到尖峰。(2)第二种方法是在切削刃处暴露基底，发现这对延长刀具寿命非常有效。当刀具前刀面高度在12 ~ 22 m范围内，刃带宽度<micrn>在70 ~ 90 m范围内<micrn>时，刀具寿命比传统刀具延长6 ~ 9倍。(3)为了发现这些方法能够改善性能的原因，通过SEM跟踪裂纹的扩展并测量温度分布。虽然雷克斯刀具与普通刀具在温度分布上没有差别，但在刀具失效过程中两者有很大的差异。