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Effect of cryogenic cooling on deformation of milled thin-walled titanium alloy parts

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Abstract

The thin-walled titanium alloy parts have the poor structural stiffness, and the surface deformation error can hardly be improved under heavy processing load, so that has poor machinability for this kind of materials. Based on the comprehensive investigation, liquid nitrogen (LN2) cooling can change obviously the mechanical properties of alloy materials and reduce greatly the cutting heat, and it has been widely used in difficult-to-process materials. In this paper, the deflection and angle models of cutting deformation of titanium alloy thin-walled parts were established. A series of machining experiments were conducted using LN2 and traditional flood cooling strategies, and the influence of milling temperature on machining deformation was analyzed. The results show that the deflection and angle of machining deformation are mainly related to milling force and elastic modulus. When the cooling temperature is reached −130 ℃, there are few burrs on the machined surface. The brittle chip fracture is realized for cutting thin-walled parts, the milling force is increased, and the machining error is decreased clearly. Meanwhile, the location of the occurred deflection and angle has risen significantly near 10 mm, and the machining deformation is reduced obviously compared to the flood cooling. In cryogenic cooling, the increase of cutting stiffness, the change of chip breaking form, and the reduction of deflection are the main reasons for the improvement of thin-walled milling deformation defects. Furthermore, the cryogenic cooling strategy can effectively improve the deformation problem and obtain better machinability for the thin-walled titanium alloy parts.

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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-traditional 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 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 that 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. Effect of cryogenic cooling on deformation of milled thin-walled titanium alloy parts. Int J Adv Manuf Technol 122, 3683–3692 (2022). https://doi.org/10.1007/s00170-022-10137-y

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