Cutting capability of micro drills in non-step drilling 2nd Report: Influence of diamond-like carbon (DLC) coating on chip ejection performance

For precision machining of fuel injection nozzles, a micro-drilling process to drill micro-holes <0.2 mm in diameter is required. In this study, a non-step drilling method for high-efficiency processing is developed. Previously, the effects of drill feed rate were verified to measure thrust force...

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Bibliographic Details
Published inJournal of the Japan Society for Abrasive Technology Vol. 61; no. 8; p. 438
Main Authors UCHIYAMA, Mitsuo, SAKATA, Naoshi, TAKAHASHI, Yuuki, HONMA, Kazuki
Format Journal Article
LanguageEnglish
Japanese
Published Tokyo Japan Science and Technology Agency 01.01.2017
Subjects
Chip formation
Cutting
Diamond drills
Diamond machining
Diamond-like carbon films
Drilling
Drills
Feed rate
Fuel injection
Nozzles
Precision machining
Product design
Thrust
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Summary:For precision machining of fuel injection nozzles, a micro-drilling process to drill micro-holes <0.2 mm in diameter is required. In this study, a non-step drilling method for high-efficiency processing is developed. Previously, the effects of drill feed rate were verified to measure thrust force and torque during drilling, and the results indicated that a high feed rate capable of keeping chips to a continuous form was optimal. Here, the cutting performance of the non-step drilling method was investigated by experiments. Machining tests indicated that use of a diamond-like carbon (DLC)-coated drill for chip exhaust out of the drilling hole of the micro-drill allowed a higher feed rate to be applied.
ISSN:0914-2703
1880-7534
DOI:10.11420/jsat.61.438