An Investigation of Tool Life and Surface Roughness in End Milling Nickel-based Superalloy Mar-M247

端銑削鎳基超合金Mar-M247之刀具壽命與表面精度研究

郭春寶(Chu-Pao Kuo) ； 蘇森傑(Sen-Chieh Su) ； 林其德(Chi-Der Li) ； 陳紹賢(Shao-Hsien Chen)

《中國機械工程學刊》 31卷4期 (2010/08) Pp. 325-333

https://doi.org/10.29979/JCSME.201008.0007

摘要

本研究主要探討端銑削鎳基超合金Mar-M247時之刀具壽命與工件表面精度之表現。由於Mar-M247具有鎳基超合金特有之高強度、低導熱性與加工硬化等之難加工特性，因此研究當中利用不同幾何形狀之捨棄式刀具，搭配多種加工參數（切削速度、進給率與切深）的改變，藉由觀察刀具磨耗的機構與模式演變，進而推演出刀具壽命公式、表面精度與加工參數間之關聯性。而刀具壽命與切削參數間的關聯性並非如預期般的隨進給率增加而減少，切削速度增加而降低，顯見Mar-M247之材料加工硬化特性對切削時有決定性的影響。此外也發現到圓形捨棄式刀具對Mar-M247有較佳的切削表現，能有效降低Crater和Notch磨耗的發生。

並列摘要

This paper describes an experimental investigation on the influence on tool life when end milling the difficult to cut material Mar-M247, which is one of a family of nickel-based superalloys that are used for gas turbine applications requiring high temperature strength. The series tests were carried out using carbide inserts to evaluate the effect of varying cutting speed, feed rate, depth of cut, tool coating material, and tool geometry on tool wear, tool life, and workpiece surface roughness. It is observed that tool life is very sensitive to the various combinations of the cutting parameters and does not always decrease as the cutting speed and feed rate increase, as might be expected. The results also show that round inserts improve cutting performance in comparison with square ones due to the stronger cutting edge that aids crater and notch wear.

並列關鍵字

Mar-M247 ； tool life ； surface roughness ； end milling