Investigation on influence of hybrid nozzle of CryoMQL on tool wear, cutting force, and cutting temperature in milling o
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ORIGINAL ARTICLE
Investigation on influence of hybrid nozzle of CryoMQL on tool wear, cutting force, and cutting temperature in milling of titanium alloys Ki Hyeok Song1 · Dong Wook Lim2 · Jeong Yeon Park3 · Seok Jae Ha3 · Gil Sang Yoon3 Received: 5 December 2019 / Accepted: 15 June 2020 © Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract The titanium alloy has a low thermal conductivity of 1/8th that of common metals and half that of stainless steel. The heat dissipation is poor during dry cutting, so the cutting temperature rises above about 600 ◦ C. Due to this, the quality of the cutting surface decreases during machining, and rapid tool wear occurs. To solve this, the use of cutting fluid is essential, but the chemical composition of the cutting fluid has a negative effect on the body and the environment. In the current cutting process, in order to minimize this effect, eco-friendly processing using minimum quantity lubrication (MQL) is performed. The machining method using both MQL and a cryogenic gas separately applies the MQL and the cryogenic gas to both sides of the cutting tool. In this case, the oil mist cannot penetrate the cutting zone due to the spray pressure of the cryogenic gas. Therefore, it is necessary to design a hybrid nozzle that can spray oil mist and cryogenic gas into a single flow. Besides, although the study on the effect of MQL and cryogenic machining on the cutting temperature should be preceded, most of the titanium MQL processing papers only study the material surface and tool wear. Accordingly, in this study, we designed and fabricated the hybrid type nozzle of CryoMQL which combined MQL and a cryogenic gas to improve the spraying concentration. And the cutting temperature generated by the process was measured, and the effectiveness of the proposed nozzle on decreasing the cutting temperature was evaluated. Besides, cutting force and tool wear were analyzed according to each cutting method. Keywords Integrated MQL and cryogenic gas · Minimum quantity lubrication (MQL) · Cryogenic machining · Titanium alloys · Tool wear · Cutting temperature
Seok Jae Ha
1 Introduction
[email protected] Ki Hyeok Song [email protected] Dong Wook Lim [email protected] Jeong Yeon Park [email protected] Gil Sang Yoon [email protected] 1
Department of Design Die & Mold, Korea Polytechnics, Incheon, Korea
2
Department of Mechanical Engineering, Inha University, Incheon, Korea
3
Molds & Dies Technology R&D Group Advanced Manufacturing Research Institute, Korea Institute of Industrial Technology, Incheon, Korea
Titanium (Ti) is a hard material used for components, such as aircraft components and medical devices, and is classified as quite representative of a “difficult-to-cut” material. Due to the low thermal conductivity, a cutting temperature of 600 ◦ C or higher occurs when cutting titanium, and as a result, the cutting chips are fused to the cutting tool surface, resulting in rapid tool wear and reduced machining surface roughness [1]. With the intent of improving t
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