[논문]인코넬 601의 효율적인 MQL드릴링 가공

박기범; 조영태; 정윤교

doi:10.14775/ksmpe.2018.17.4.001

인코넬 601의 효율적인 MQL드릴링 가공
Efficient MQL-based Drilling of Inconel 601 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.17 no.4, 2018년, pp.1 - 8

박기범 (창원대학교 기계공학과) , 조영태 (창원대학교 기계공학과) , 정윤교 (창원대학교 기계공학과)

Abstract ▼ AI-Helper

In drilling Inconel 601, which is used for compressor cases in aircraft engines, a lot of cutting oil must be supplied. This prevents tools from wear and fracture due to the heat buildup resulting from the high-temperature resistance and toughness of this alloy. However, the cutting oil supply has compromised the machining environment. This has caused attention to shift to an environmentally friendly cutting fluid supply system called the Minimum Quantity Lubrication(MQL) system. The aim of this study was to find a more efficient drill processing method using MQL and to verify its performance. To that end, the properties of Inconel that make it difficult -to -drill were studied by a comparison with the drilling of SM45C. Specific factors (i.e., cutting force and tool wear) were examined in relation to the conditions in the MQL-based drilling system. Based on these results, a sealed cover and step feed were proposed as measures to increase the effectiveness of the MQL system. The efficiency of the proposed method was established.

주제어

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가설 설정

1. Inconel was characterized by markedly lower machinability than was structural steel S45C. The conditions for most efficient drilling were spindle speed (V_s)=500rpm and feed (f)=0.

제안 방법

For the drilling of Inconel 601, a TiAlN-coated WCdrill of 5 mm diameter (DH 423050, YG1) was used. As the workpieces, Inconel 601, Inconel718, and SM45C were used, of which the mechanical properties are specified in Table 2. To measure the axial thrust force in drilling, piezoelectric-element tool dynamometer (7075B, Kistler, Switzerland) was used. To observe the wear and tear of the drill edge, atool microscope from SOMETECH(South Korea) was used.
This mist easily diffuses into the surrounding air resulting in less effective lubrication than with a wet process. In this work, an improved MQL (IMQL) process was developed to overcome the problems of MQL and conventional drilling process. IMQL is even more practical, efficient, and eco-friendly.

대상 데이터

The machine tool used for the present drilling experiment was a VC630 5AX Machining Center, Doosan Infracore, featuring a 20,000rpm spindle rotation speed. The oil mist provider (MQL device)was a LubriLean Vario UFV10-003 (VOGEL, Germany), and its details are specified in Table 1. For the drilling of Inconel 601, a TiAlN-coated WCdrill of 5 mm diameter (DH 423050, YG1) was used. As the workpieces, Inconel 601, Inconel718, and SM45C were used, of which the mechanical properties are specified in Table 2.

성능/효과

2. Although MQL increased the oil-mist flow rate, the effect was negligible in comparison to wetdrilling because too little oil mist reached the drill point.
3. Based on the performance tests, the sealed cover improved the effect of MQL, when combined with adequate fluid flow-rate.

참고문헌 (15)

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상세보기
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상세보기
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상세보기
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원문보기 상세보기
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상세보기
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상세보기
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원문보기 상세보기
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상세보기
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