Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology

Nanjing, China

Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology

Nanjing, China
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Meng K.,Nanjing University of Aeronautics and Astronautics | Meng K.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | Lou P.,Nanjing University of Aeronautics and Astronautics | Lou P.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | And 2 more authors.
International Journal of Production Economics | Year: 2017

The increasing external pressure to establish sustainable operations has forced firms to embrace approaches such as sustainable manufacturing through product recovery. To improve the performance of product recovery, we studied a decision-making problem involving the selection between end-of-life product remanufacturing and dismantling. A quality-dependent multi-objective optimization model was developed and validated to identify the optimal or near optimal product recovery solution that best balances the economic, environmental and societal performances of product recovery for sustainability. We also investigated how the quality level, recovery cost and retail price impact the product recovery decision under different decision makers’ preferences. Experiments on a case of an automobile engine model demonstrated the multi-objective optimization model's effectiveness to achieve satisfactory recovery solution. The results also provide insights for product recovery practices, which can assist firms in adapting their practices to meet the challenges of sustainability. © 2017


Meng K.,Nanjing University of Aeronautics and Astronautics | Meng K.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | Lou P.,Nanjing University of Aeronautics and Astronautics | Lou P.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | And 2 more authors.
International Journal of Production Research | Year: 2017

Reverse logistics has emerged as a promising strategy for enhancing environmental sustainability through remanufacturing, reusing, or recycling used components. It is crucial to pursue quality-driven decision-making for component recovery because quality is a dominant factor for component salvage value and its recoverability. To maximise the profit from component recovery, a quality-driven decision model was proposed in this study. Remaining useful life (RUL) was utilised as a measure of quality in the proposed model, where conditional RUL distribution was predicted by utilising both the failure data and condition monitoring data based on a proportional hazard model. Under RUL uncertainty, an interval decision-making approach was developed to suggest recovery strategies for the decision-makers to identify a satisfactory solution according to their risk preferences. Compared to the existing approaches for quality-driven recovery decision-making based on RUL prediction, this work provides a more accurate and powerful approach to managing and mitigating decision risk. Numerical experiments demonstrated the effectiveness and superiority of the proposed model. © 2017 Informa UK Limited, trading as Taylor & Francis Group


Dai M.,Nanjing University of Aeronautics and Astronautics | Dai M.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | Tang D.,Nanjing University of Aeronautics and Astronautics | Tang D.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | And 3 more authors.
Robotics and Computer-Integrated Manufacturing | Year: 2013

The traditional production scheduling problem considers performance indicators such as processing time, cost, and quality as optimization objectives in manufacturing systems; however, it does not take energy consumption or environmental impacts completely into account. Therefore, this paper proposes an energy-efficient model for flexible flow shop scheduling (FFS). First, a mathematical model for a FFS problem, which is based on an energy-efficient mechanism, is described to solve multi-objective optimization. Since FFS is well known as a NP-hard problem, an improved, genetic-simulated annealing algorithm is adopted to make a significant trade-off between the makespan and the total energy consumption to implement a feasible scheduling. Finally, a case study of a production scheduling problem for a metalworking workshop in a plant is simulated. The experimental results show that the relationship between the makespan and the energy consumption may be apparently conflicting. In addition, an energy-saving decision is performed in a feasible scheduling. Using the decision method, there could be significant potential for minimizing energy consumption. © 2013 Elsevier Ltd.


Qu N.,Nanjing University of Aeronautics and Astronautics | Qu N.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | Chen X.,Nanjing University of Aeronautics and Astronautics | Li H.,Nanjing University of Aeronautics and Astronautics | Zeng Y.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology
Chinese Journal of Aeronautics | Year: 2014

The application of surface textures has been employed to improve the tribological performance of various mechanical components. Various techniques have been used for the application of surface textures such as micro-dimple arrays, but the fabrication of such arrays on cylindrical inner surfaces remains a challenge. In this study, a dry-film photoresist is used as a mask during through-mask electrochemical micromachining to successfully prepare micro-dimple arrays with dimples 94 μm in diameter and 22.7 μm deep on cylindrical inner surfaces, with a machining time of 9 s and an applied voltage of 8 V. The versatility of this method is demonstrated, as are its potential low cost and high efficiency. It is also shown that for a fixed dimple depth, a smaller dimple diameter can be obtained using a combination of lower current density and longer machining time in a passivating sodium nitrate electrolyte. © 2014 Production and hosting by Elsevier Ltd.


Qu N.S.,Nanjing University of Aeronautics and Astronautics | Qu N.S.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | Qian W.H.,Nanjing University of Aeronautics and Astronautics | Hu X.Y.,Nanjing University of Aeronautics and Astronautics | Zhu Z.W.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology
Materials and Manufacturing Processes | Year: 2014

Electroforming has been applied in the fabrication of a mold. However, its lower microhardness has prevented its wider usage in general plastics and optical mold making. In this paper, CeO2 nanoparticles is first added to the bath to improve the microhardness of the electroformed microprism mold. Compared with microprism pure nickel mold, the microhardness and the wear resistance of the microprism Ni-CeO2 nanocomposite mold were significantly improved. The maximum microhardness of 530HV was observed in the nanocomposite deposits obtained at the current density of 1 Adm-2, and the microhardness of pure nickel is approximately 291HV. Finally, a microprism Ni-CeO2 nanocomposite mold was successfully electroformed. © 2014 Taylor and Francis Group, LLC.


Wang J.,Nanjing University of Aeronautics and Astronautics | Zhang L.,Nanjing University of Aeronautics and Astronautics | Lu F.,Nanjing University of Aeronautics and Astronautics | Lu F.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | And 2 more authors.
Wear | Year: 2014

Ferrography is a notably useful means to determine the wear condition of machines. Before attempting to extract the feature parameters of wear particles for identification and analysis, it is necessary to separate wear particles in ferrograph images. Hence, wear particle segmentation is a critical first step for intelligent ferrography based on computer image analysis. This paper presents a new method for the segmentation of wear particles by combining watershed and an improved ant colony clustering algorithm. The experimental results have demonstrated the possibility of achieving accurate segmentation of wear particles, including large abnormal wear particles and deposited chains. © 2014 Elsevier B.V.


Li M.,Nanjing University of Aeronautics and Astronautics | Huang W.,Nanjing University of Aeronautics and Astronautics | Huang W.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | Wang X.,Nanjing University of Aeronautics and Astronautics | Wang X.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology
Biointerphases | Year: 2015

Inspired by peg-studded hexagonal epidermal cells found in biological pad interfaces, biomimic hierarchical surface patterns with different degrees of wettability were fabricated using a new method involving photolithography and wet etching. In order to understand the effects of the pegstudded structures on wettability and frictional properties, varying patterns were studied and compared. Experimental results show that the hierarchical patterns led to a significant increase in wettability and sliding friction forces on hydrophilic surfaces, whereas they resulted in higher apparent static contact angles and lower sliding friction forces on hydrophobic surfaces. This indicates that the hydrophilic hierarchical structure on smooth toe-pads is favorable for keeping the surface moist and increasing the interfacial friction force when climbing in wet conditions. © 2015 American Vacuum Society.


Zhu Y.,Nanjing University of Aeronautics and Astronautics | Zhu Y.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | Fu J.,Nanjing University of Aeronautics and Astronautics | Ju Z.,Nanjing University of Aeronautics and Astronautics | And 2 more authors.
Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering | Year: 2013

To study the impact of material characteristics on the machining performance of hydrophilic fixed abrasive pad (FAP), K9 optical glass and silicon wafers were chosen as the work-pieces to explore the effect of machining sequence on the acoustic emission signal and friction coefficient during lapping. Scanning electron microscope (SEM) was employed to analyze the size and morphology of debris. Results show that material removal rate (MRR) varies greatly with the change of the machining sequence. Compared with the direct lapping of silicon wafer, if the silicon wafer is lapped after the lapping of a K9 glass work-piece, its MRR will greatly decrease. In contrast, the MRR of K9 glass is almost the same no matter whether it is lapped directly or after the lapping of a silicon wafer. The average surface roughness of both directly lapped silicon wafer and K9 glass is lower than that of work-pieces which are lapped after the lapping of the other. The size of most silicon debris is about 600 nm-1.5 μm, with clear edge; while that of K9 glass is around 300 nm-500 nm, edgeless. The greater size and clear edge of debris created during the lapping of silicon wafer are helpful for the self-conditioning process of hydrophilic FAP. Therefore, brittle materials such as silicon are helpful for the self-conditioning behavior of FAP.


Huang W.,Nanjing University of Aeronautics and Astronautics | Huang W.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | Wang X.,Nanjing University of Aeronautics and Astronautics | Wang X.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology
Bioinspiration and Biomimetics | Year: 2013

In this paper, an observation on the toe pad of a newt was carried out. It was found that the pad surface is covered with an array of polygonal cells separated by channels, similar to those of a tree frog's pad. With this micro-structure, a newt can move on wet and smooth surfaces without slipping. Inspired by the surface structure of newt toe pads, elastic micro-patterned surfaces were fabricated to understand the function of such micro-structures in friction systems. The tribological performance of the patterned surfaces was evaluated using a tribometer. Different tribological performances between micro-dimple and -pillar patterned surfaces were observed. The area density (r) of the micro-pattern is crucial for controlling the friction of the elastic surface. Distinguished from unpatterned and micro-dimple patterned surfaces, the pillar patterned surface with high area density can remain high friction at high sliding speed. It could be one of the reasons of such polygonal structures on newt's toe pads. © 2013 IOP Publishing Ltd.


Qu N.S.,Nanjing University of Aeronautics and Astronautics | Qu N.S.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology | Ji H.J.,Nanjing University of Aeronautics and Astronautics | Zeng Y.B.,Jiangsu Key Laboratory of Precision and Micro Manufacturing Technology
International Journal of Advanced Manufacturing Technology | Year: 2014

Wire electrochemical machining (WECM) is a cutting process in which the workpiece acts as an anode and the wire as a cathode. WECM is typically used to cut plates and exhibits a great advantage over wire electro-discharge machining, namely, the absence of a heat-affected zone around the cutting area. The enhancement of WECM accuracy is a research topic of great interest. In WECM, the homogeneity of the machined slit has a decisive influence on the machining accuracy. This is the first study in which the integration of pulse electrochemical machining (ECM) and a reciprocated traveling wire electrode was used to improve the homogeneity of this slit. The experimental results show that the combination of pulse ECM and a reciprocated traveling wire electrode could enhance the accuracy of WECM and that generally a low applied voltage, pulse duty cycle, and electrolyte concentration; an appropriate traveling wire velocity; and a high pulse frequency and feeding rate enhance the accuracy and stability of WECM. Finally, a microstructure with a slit width of 177 μm, with a standard deviation of 1.5 μm, and with an aspect ratio of 113 was fabricated on a stainless steel substrate measuring 20 mm in thickness. © 2014 Springer-Verlag London.

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