A study on environment-friendly machining of titanium alloy via composite electrostatic spraying
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ORIGINAL ARTICLE
A study on environment-friendly machining of titanium alloy via composite electrostatic spraying Yu Su 1 & Hai Jiang 1 & Zhiqiang Liu 1 Received: 21 March 2020 / Accepted: 10 August 2020 / Published online: 22 August 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Compared with minimum quantity lubrication, electrostatic spraying can greatly improve machining and environmental performances. However, the cooling and lubricating performance of electrostatic spraying needs to be further improved. In this paper, the composite electrostatic spray cutting approach is proposed, and the environment-friendly machining of titanium alloy by using this approach is investigated. An atomization test device for composite electrostatic spray cutting and a composite electrostatic spray milling system are developed. The atomization tests for composite electrostatic spray cutting are performed to study its atomization morphology and to determine the atomization parameters that guarantee a stable composite electrostatic spraying. The atomization current is measured by using a picoammeter under stable composite electrostatic spraying conditions, and the charging performance and atomizing stability of composite electrostatic spraying are evaluated. Milling experiments of titanium alloy and ambient oil mist concentration tests are also carried out under electrostatic and composite electrostatic spraying conditions. The effects of composite electrostatic spraying on milling force, tool wear, chip morphology, and oil mist concentration are analyzed. Results show that compared with electrostatic spraying, composite electrostatic spraying can effectively reduce tool wear and oil mist concentration. Under composite electrostatic spraying condition, an increase in the flow rates of internal and external fluids can further reduce tool wear. An increase in the flow rate of internal fluid does not affect ambient oil mist concentration. But an increase in the flow rate of external fluid significantly increases ambient oil mist concentration. Keywords Composite electrostatic spraying . Electrostatic spraying . Atomization morphology . Milling performance
1 Introduction In the cutting process, a large amount of cutting fluid is usually poured to reduce cutting temperature and to subsequently reduce tool wear and improve machining quality. However, using a large amount of cutting fluid will bring a series of negative effects, such as increased manufacturing costs, serious environmental pollution, and negative effects on the health of workers [1, 2]. Therefore, a green cutting approach
* Yu Su [email protected] Hai Jiang [email protected] Zhiqiang Liu [email protected] 1
College of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
must be implemented. Minimum quantity lubrication (MQL) is a green cutting technology that mixes and atomizes lubricating oil with compressed air and sprays them to the machining area for cooling and lubrication. In the MQL cutt
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