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Milling performance of cryogenic cooled titanium alloy thin-walled parts based on cantilever sheet

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Abstract

Considering the lower structural stiffness of titanium alloy thin-walled parts, the machining deformation defects were inevitable. In this paper, the theory and a series of experiments of liquid nitrogen (LN2) cooled titanium alloy milling were executed in details. Based on cantilever sheet, a deflection calculation model of thin-walled parts subjected to milling force load was established considering cooling temperature. Compared with the conventional cooling milling strategy, the effects of LN2 jet impingement on the deformation of milling area were analyzed. The results showed the deformation is related to the milling force, elastic modulus, and the milling point coordinates, and the cooling temperature has an effect on the milling deformation. At cryogenic, the milling force can only be increased by 10% compared with conventional cooling, but nearly 30% for the elastic modulus, as well as following the decreased deflection. At − 130 °C, the brittle chip fracture can be achieved, and the burr phenomenon on the machining surface is improved as well as the machining error. And the deformation of the milling area is decreased significantly. Meanwhile, the high speed milling can reduce the load of the free cutting parts. In addition, LN2 can be achieved full boiling at the large flow of 35.5 L/h, and can quickly reduce the cooling temperature of cutting area and improve the heat transfer efficiency itself. The high milling speed and larger LN2 flow can further improve the deformation defects of thin-walled parts. The cryogenic cooling strategy can change the chip breaking form, reduce the flexural deformation, increase the effective milling speed, and improve the milling system stiffness and the cutting heat transfer efficiency. They are the main reasons for the improvement of the deformation defects in thin-walled parts milling.

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We declare that data sets used or analyzed in the current study can be obtained from corresponding author at reasonable request.

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Funding

This research was partially supported by the natural science foundation project of Liaoning province (no. 2020MS217), the Key Project of Education Department of Liaoning Province (no. LJKZ0237), the National Key R&D Program of China (no. 2019YFB2005400), and the Key Laboratory for Precision/Non-conventional Machining and Micromanufacturing Technology of Ministry of Education, Dalian University of Technology (no. B202001).

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Authors and Affiliations

  1. School of Mechanical Engineering, Shenyang Ligong University, Shenyang, 110159, China

    Fengbiao Wang

  2. School of Mechanical Engineering, Dalian University of Technology, Dalian, 116024, China

    Yongqing Wang

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  1. Fengbiao Wang
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  2. Yongqing Wang
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Contributions

The author focuses on the research on the mechanism and technology of cryogenic cooling machine for difficult-to-machining materials. The process can improve the machining quality, efficiency, and tool life. The research obtains the cooling mechanism of cryogenic coolant. For difficult-to-machining materials, it is a good method to solve the problem of high-efficiency and high-quality machining.

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Correspondence to Fengbiao Wang.

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We declare this research belongs to the field of machining and manufacturing. Only machine tools, alloys, and inorganic liquid nitrogen are employed to be tested and that does not involve any organic life, such as people, animals, and plants. And the issues of life science and ethics research do not also be involved and considered.

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This study was conducted by the corresponding author under the guidance of the professor named Yongqing Wang in Dalian University of Technology. The involved researchers have been listed in the article, and all authors have no objection.

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Wang, F., Wang, Y. Milling performance of cryogenic cooled titanium alloy thin-walled parts based on cantilever sheet. Int J Adv Manuf Technol 128, 2261–2270 (2023). https://doi.org/10.1007/s00170-023-11987-w

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