Xuelin Lei

East China University of Science and Technology

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Fanghong Sun

Shanghai Jiao Tong University

Bin Shen

Shanghai Jiao Tong University

Yun He

East China University of Science and Technology

Lv‐Yi Cheng

East China University of Science and Technology

Xiancheng Zhang

East China University of Science and Technology

Wei Li

Zhengzhou Railway Vocational & Technical College

Fei Zeng

Wuhan University of Science and Technology

Cenyao He

East China University of Science and Technology

Jiachen Wang

Xinyang Normal University

Run‐Zi Wang

Tohoku University

Cooperative Institutions

East China University of Science and Technology

Chinese Academy of Sciences

Shanghai Jiao Tong University

University of Chinese Academy of Sciences

Shanghai University

Tianjin University

Central South University

Northwestern Polytechnical University

China University of Mining and Technology

Nanjing Medical University

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Tribological behavior between micro- and nano-crystalline diamond films under dry sliding and water lubrication

Tribology International (2013)

Xuelin Lei Bin Shen Sulin Chen Liang Wang Fanghong Sun

Lubricity

10.1016/j.triboint.2013.09.012

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Citations (55)

Effect of oxygen doping on cutting performance of CVD diamond coated milling cutters in zirconia ceramics machining

International Journal of Refractory Metals and Hard Materials (2024)

Yu Gu Erqing Zhang Jiachen Wang Hongtao Shen Xuelin Lei

10.1016/j.ijrmhm.2024.106853

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Design of a novel cold expansion tool for deep small holes based on FEM simulations and experimental study

Research Square (Research Square) (2023)

Jiachen Wang Xuelin Lei Fei Zeng Wei Li Cenyao He

Abstract Cold hole expansion is a crucial technology for enhancing the fatigue life of hole structures. This paper presents the design and optimization of a novel multi-convex hulls expansion tool for deep small holes in Inconel 718 superalloy using the finite element method (FEM) and experimental techniques. The results from the FEM model, which was used to investigate the compressive residual stress (CRS) distribution and contact force during the expansion process, indicate that the curved single convex hull(CSCH) structure is more suitable for deep small hole expansion (DSHE). However, accounting for the strength limitations of the actual expansion tool, a multi-convex hulls expansion tool structure was proposed. The FEM model was employed to compare the effects of various tool structures on the hole wall CRS distribution and the contact force during the expansion process. The obtained optimal parameters for enhancing deep small holes in Inconel 718 superalloy under high temperature and high load conditions are as follows: expansion section hull spacing l 1 = 0.4 mm, taper ratio C = 0.008, number of convex hulls in the sizing section n = 10, and sizing section hull spacing l 2 = 1 mm. Moreover, an optimized convex hull expansion amount allocation scheme was obtained through an experimental study. The results of the FEM simulations and experimental study demonstrate that the optimized multi-convex hulls expansion tool (with an expansion rate of 1.92%) can induce the formation of a high CRS layer and a refined surface without causing significant microcracks in the hole walls.

Inconel

10.21203/rs.3.rs-3457437/v1

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Enhanced Tribological Performance of Diamond Films by Utilizing DLC and DLC-H Top Layers

Journal of Shanghai Jiaotong University (Science) (2021)

Xuelin Lei Ying Yan Hang Zhang Zixuan Li Yun He

Diamond-like carbon

Lubricity

Carbon fibers

10.1007/s12204-021-2399-9

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A novel hole cold-expansion method and its effect on surface integrity of nickel-based superalloy

Journal of Material Science and Technology (2020)

Xian Long Cao Ping Zhang Shuang Liu Xuelin Lei Run‐Zi Wang

Surface Integrity

Mandrel

10.1016/j.jmst.2020.05.022

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Citations (35)

Effect of cooling and lubrication conditions on cutting performance and surface integrity of Inconel 718 superalloy in end face milling

Advances in Mechanical Engineering (2023)

Xuelin Lei Xiangzheng Wei Yun He

Inconel 718 nickel-based superalloy has superior thermal and mechanical properties. Nevertheless, it is a hard-to-machine material, and the heat generated by processing is excessive. Reasonable cooling and lubrication (CL) methods have essential effects on its cutting performance and surface integrity. In this study, Dry cutting (DC), flood cutting (FC), cryogenic cutting (CC), and cryogenic minimum quantity lubrication cutting (CMQLC), are used to cutting Inconel 718 under the same parameters. Cutting forces, temperature, tool wear, chip, Ra, microstructure, and residual stress (RS) are measured. It is concluded that the combination of CL is beneficial for processing. The average temperature obtained by CMQLC is 55.47% lower than that of DC. And the workpiece obtained by CMQLC is measured compared with FC, the area of tool chipping is reduced by 25%, and the surface Ra is decreased by 32.05%, the lowest among the four methods. As for RS, although TRS increased by 7.9%, the MCRS and influence depth of the subsurface increased by 3.9% and 10.2% respectively. Furthermore, the machining condition with a high mechanical thermal ratio can obtain a more favorable RS state. Generally speaking, the CMQLC shows the advantages of mild environmental pollution, preferred cutting performance, and superior workpiece surface integrity.

Surface Integrity

Inconel

10.1177/16878132231158217

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Citations (4)

Comparative Study on Cutting Performance of Chaser and Triangle-Shaped Inserts in Inconel 718 Turning

Journal of Shanghai Jiaotong University (Science) (2019)

Xuelin Lei Yukai Shi Yun He

Rake angle

Inconel

Insert (composites)

Cutting tool

10.1007/s12204-019-2074-6

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SIMULATION-BASED OPTIMAL DESIGN OF HFCVD EQUIPMENT ADOPTED FOR MASS PRODUCTION OF DIAMOND FILMS ON INNER-HOLE SURFACES

Surface Review and Letters (2014)

Xinchang Wang Xuelin Lei Lei Cheng Fanghong Sun Bin Shen

HFCVD diamond films have been extensively applied on inner-hole surfaces of some wear resistant components as protective coatings, the mass production of which puts forward a high request to the HFCVD equipment. In this paper, adopting a typical kind of drawing die as the substrate, several different substrate configurations are proposed to expand the capacity of the equipment. Temperature distributions on inner-hole surfaces of the substrates are respectively predicted and compared by the finite volume method (FVM) simulations. In summary, for parallel configurations, proper-designed auxiliary devices (e.g. the heat-insulated plate, the water-cooled plate and the heat-insulated cushion block) can provide sufficient effects on the uniformity of the substrate temperature distribution. Moreover, without any auxiliary devices, homogeneous substrate temperature distributions can also be obtained using circular pattern configurations (radial, hexagon and triangular). Accordingly, the HFCVD equipment referring to the design concept of the triangular configuration is trial-manufactured. In the verification experiments, similar substrate temperature values are detected in three different modules, and as-deposited microcrystalline diamond (MCD) and nanocrystalline diamond (NCD) films both present uniform grain size, thickness and quality, well validating the rationality and correctness of the simulation-based optimal design.

Microcrystalline

10.1142/s0218625x14500668

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Citations (5)

OPTIMIZATION OF CVD DIAMOND COATING TYPE ON MICRO DRILLS IN PCB MACHINING

Surface Review and Letters (2015)

Xuelin Lei Yu He Fanghong Sun

The demand for better tools for machining printed circuit boards (PCBs) is increasing due to the extensive usage of these boards in digital electronic products. This paper is aimed at optimizing coating type on micro drills in order to extend their lifetime in PCB machining. First, the tribotests involving micro crystalline diamond (MCD), nano crystalline diamond (NCD) and bare tungsten carbide (WC-Co) against PCBs show that NCD–PCB tribopair exhibits the lowest friction coefficient (0.35) due to the unique nano structure and low surface roughness of NCD films. Thereafter, the dry machining performance of the MCD- and NCD-coated micro drills on PCBs is systematically studied, using diamond-like coating (DLC) and TiAlN-coated micro drills as comparison. The experiments show that the working lives of these micro drills can be ranked as: NCD[Formula: see text]TiAlN[Formula: see text]DLC[Formula: see text]MCD[Formula: see text]bare WC-Co. The superior cutting performance of NCD-coated micro drills in terms of the lowest flank wear growth rate, no tool degradation (e.g. chipping, tool tipping) appearance, the best hole quality as well as the lowest feed force may come from the excellent wear resistance, lower friction coefficient against PCB as well as the high adhesive strength on the underneath substrate of NCD films.

Tungsten Carbide

10.1142/s0218625x15501085

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Citations (12)

Optimization of diamond coated microdrills in aluminum alloy 7075 machining: A case study

Diamond and Related Materials (2014)

Xuelin Lei Bin Shen Fanghong Sun

Microcrystalline

10.1016/j.diamond.2014.11.003

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Citations (19)