The Performance of Diamond-Like Carbon Coated Drills in Thermally Assisted Drilling of Ti-6Al-4V

被引：21

作者：

Bhowmick, S. ^{[1
]}

Alpas, A. T. ^{[1
]}

机构：

[1] Univ Windsor, Windsor, ON N9B 3P4, Canada

来源：

JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME | 2013年 / 135卷 / 06期

基金：

加拿大自然科学与工程研究理事会;

关键词：

titanium alloys; Ti-6Al-4V; diamond-like carbon; thermally assisted machining; drilling; tool coatings; adhesion; tribology; TEMPERATURE TRIBOLOGICAL BEHAVIOR; MACHINING TITANIUM-ALLOYS; CHIP FORMATION; RAMAN-SPECTROSCOPY; SURFACE INTEGRITY; WEAR MECHANISM; DLC COATINGS; TOOL LIFE; ALUMINUM; MACHINABILITY;

D O I：

10.1115/1.4025739

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Drilling performances of diamond-like carbon coatings incorporating W (W-DLC) deposited on high-speed steel tools were evaluated when drilling Ti-6Al-4V at 25 degrees C and under thermally assisted machining (TAM) conditions at 400 degrees C. Dry drilling using W-DLC coated drills caused immediate tool failure as a result of titanium adhesion. The tool lives improved for TAM drilling using W-DLC when the Ti-6Al-4V was placed (with dry surface) in a cooling bath at -80 degrees C and resulted in low and uniform drilling torques as well as good surface finish. The low coefficient of friction (COF) of W-DLC against Ti-6Al-4V observed under TAM conditions was attributed to the formation of W oxide layers at the tool surface, as determined by Raman spectroscopy. Introducing a cooling bath was necessary in order to restrict the temperature rise in the workpiece that caused rapid tool wear above 500 degrees C during drilling operations and also to prevent adhesion with minimal built-up edge (BUE) formation during drilling. The TAM performance of W-DLC coated drills was shown to be similar to that of WC-Co drills used in conventional flooded drilling.

引用

页数：15

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