Article
Engineering, Manufacturing
Rahul Yadav, N. D. Chakladar, Soumitra Paul
Summary: This study proposes a coupled thermo-mechanical transient analysis method to estimate the cutting performance during micro-machining of Titanium alloy. The effects of dynamic recrystallization and strain softening at a high strain rate are considered using a constitutive flow model. The findings have important implications for the evaluation of cutting performance in micro-machining of Titanium alloy.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Multidisciplinary
Irina Semenova, Alexander Polyakov, Alfiz Gareev, Vladimir Makarov, Ivan Kazakov, Mikhail Pesin
Summary: Titanium alloys, especially the Ti-6Al-4V alloy, are widely used in various industries. This study focuses on the machinability of ultrafine-grained Ti-6Al-4V alloys, which have the potential to exhibit excellent strength characteristics. The influence of cutting parameters on the surface roughness and microstructure of the alloy samples with coarse-grained and ultrafine-grained structures was investigated. The results showed that the cutting speed plays a significant role in determining the surface roughness of the samples, with different effects observed for the two microstructures.
Article
Engineering, Manufacturing
Yongqing Wang, Jianming Li, Kuo Liu, Shaowei Jiang, Di Zhao, Siqi Wang, Yuebing Yang
Summary: This paper investigates the chip formation mechanism of cryogenic machining based on liquid nitrogen external cooling milling experiments and cutting simulation. The results show that the degree of chip serration increases under liquid nitrogen cooling conditions, and adiabatic shear and brittle cracking jointly dominate the formation of serrated chips. This research provides a reference and guidance for chip control in cryogenic machining processes.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Engineering, Multidisciplinary
Sajjad Ahmad, Soham Mujumdar, Vinay Varghese
Summary: This study investigates the impact of porosity on the machinability of AM porous Titanium alloy. It was found that higher porosities result in increased tool chipping and surface roughness, while lower porosities exhibit pore closure phenomenon.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2022)
Article
Automation & Control Systems
Xin Liu, Xu Zhang
Summary: This study investigated the effects of differently shaped tools on cutting process temperature and wear, finding that a semi-elliptical tool based on ellipse shape effectively reduces wear depth and tool surface temperature, while remaining stable with varying texture parameters. The results suggest that elliptical micro-textured/grooved cutting tools demonstrate good stability and versatility in facing various working conditions.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jay K. Raval, Aamer A. Kazi, Xiangyu Guo, Ryan Zvanut, Chabum Lee, Bruce L. Tai
Summary: This study investigates the issues in machining additively manufactured metals and identifies the causes as material inhomogeneity, porosity, and thermal stress induced by the process. The results show that additively manufactured metals are more difficult to machine and can cause premature tool failure or surface roughness. Heat treatment can eliminate the issues related to material inhomogeneity and porosity, but there is no significant difference in surface finish under the current cutting conditions.
Article
Automation & Control Systems
Berend Denkena, Benjamin Bergmann, Florian Schaper
Summary: Titanium and titanium alloys are widely used in high-performance applications due to their high strength, low density, good corrosion resistance, and excellent biocompatibility. However, they face challenges such as low thermal conductivity, unfavorable chip formation, and chemical interactions with oxygen. This study investigates the chip formation of Ti-6Al-4 V under different cutting speeds and atmospheres, revealing the impact of the surrounding atmosphere on chip formation. It was found that an oxygen-free atmosphere leads to non-periodic segmentation of chips, while air atmosphere leads to segmental chip formation. The use of an oxygen-free atmosphere also reduces friction and lowers the feed force.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Navneet Khanna, Prassan Shah, Luis Noberto Lopez de Lacalle, Adrian Rodriguez, Octavio Pereira
Summary: This study compares the performance and life cycle assessment of conventional flood coolant, MQL, and liquid carbon dioxide coolant in titanium alloy machining. It finds that while MQL has a smaller environmental impact, it also has reduced tool life, making cryogenic machining emerge as a sustainable option due to its balance between machining performance and environmental impact.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2021)
Article
Automation & Control Systems
Javier Dominguez-Caballero, Sabino Ayvar-Soberanis, Jin Kim, Anish Roy, Lin Li, David Curtis
Summary: This study proposes a hybrid laser- and ultrasonic-assisted machining (LUAM) technique to improve the machinability of Ti-6Al-4V alloy in a turning process. The results reveal that LUAM process demonstrates process improvement with wider range of cutting speeds and depths of cut.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Jianming Li, Yongqing Wang, Kuo Liu, Di Zhao, Shaowei Jiang, Yuebing Yang, Qingbo Yu
Summary: This paper studies the chip formation mechanism of cryogenic machining and establishes a specific cutting energy model based on liquid nitrogen orthogonal milling experiments. The results show that in cryogenic machining, adiabatic shear dominates the formation of serrated chips when the cutting speed is less than 200 m/min, and the cutting energy consumption is higher than that of dry cutting. As the cutting speed exceeds 200 m/min, adiabatic shear and periodic fracture together dominate the formation of serrated chips, and the energy consumption of cutting is significantly reduced. This research provides reference and guidance for the sustainable development of cryogenic machining.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Nanoscience & Nanotechnology
Haiyang Fan, Chengcheng Wang, Yujia Tian, Kun Zhou, Shoufeng Yang
Summary: This study investigated the feasibility of using L-PBF to fabricate two Ti-6Al-4V-based bimetals, Ti-6Al-4V/γ-TiAl and Ti-6Al-4V/Ti-6242, which may have great potential for the future manufacturing of aerospace components. The bimetal Ti-6Al-4V/γ-TiAl was unsuccessfully built due to the intrinsic cold cracking of γ-TiAl processed by L-PBF. In comparison, the bimetal Ti-6Al-4V/Ti-6242 was successfully manufactured by L-PBF with a solid and defect-free interface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Multidisciplinary
Muhammad Ali Khan, Syed Husain Imran Jaffery, Mushtaq Khan
Summary: The sustainability of a manufacturing system is crucial for its efficiency and output, especially when machining hard to cut titanium alloys that require excessive energy. Process maps are effective tools for providing machinability information, and this research focuses on developing an energy consumption map for titanium alloy Ti-6Al-4V using cryogenic cooling. Cutting speed and feed rate were varied, and the map revealed the underlying mechanics of machining and the factors affecting energy consumption. Cryogenic cooling resulted in a reduction in energy consumption and increased productivity. Overall, the cryogenic map is vital for sustainable and cleaner production.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2023)
Article
Multidisciplinary Sciences
Inna Chung, Jungwon Lee, Ling Li, Yang-Jo Seol, Yong-Moo Lee, Ki-Tae Koo
Summary: Compared to single-root 3D printed implants, double-root 3D printed implants show similar stability and bone remodeling, but significant bone loss in the furcation area remains problematic.
SCIENTIFIC REPORTS
(2023)
Article
Automation & Control Systems
Shengguan Qu, Jianshuo Zhai, Pengfei Sun, Chenfeng Duan, Xiaoqiang Li
Summary: This paper investigates the enhancement of machinability of Ti-6Al-4V titanium alloy (TC4) through the electroplastic effect of high-frequency pulse current. The results show that electric pulse-assisted turning (EPT) can promote the plastic flow of grains in the surface layer of Ti-6Al-4V workpiece, reducing the turning resistance and releasing residual stress. Moreover, EPT reduces tool flank face wear compared to conventional turning (CT).
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Automation & Control Systems
Xin Liu, Xu Zhang
Summary: By designing a micro-bump tool and combining it with heat-assisted machining technology, the study demonstrated that the tool can effectively reduce the tool surface temperature and wear during cutting titanium alloys, while also lowering the cutting force.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
