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  • 1.
    Frangoudis, Constantinos
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Fu, Qilin
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Ur Rashid, Md. Masud
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Nicolescu, Cornel Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Rashid, Amir
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Experimental analysis of the CNx nano-damping material’s effect on the dynamic performance of a milling process2013Ingår i: Proceedings of the International Conference on Advanced Manufacturing Engineering and Technologies / [ed] Archenti, Andreas; Maffei, Antonio, Stockholm: KTH Royal Institute of Technology, 2013, s. 293-302Konferensbidrag (Refereegranskat)
    Abstract [en]

    Vibration phenomena are a main consideration during the material removal operation, as it has prominent effects on the product quality, cutting tool life, and productivity of that machining operation. Within the context of machining performance, role of enhanced stiffness and damping on the dynamic behaviour of machining systems such as turning and milling is well established. In this experimental analysis, investigations have been conducted for identifying the natural characteristics and dynamic responses of a milling process with the application of a novel carbon based (CNx) nano-composite damping material. TheCNx material has been applied into the joint interface of a workholding device with adaptive dynamic stiffness. Prior investigations of this material, produced by theplasma enhanced chemical vapor (PECVD) process, showed inherent damping capacity via interfacial frictional losses of its micro-columnar structures. For thisstudy, natural characteristics of the workholding system have been characterized bythe modal impact testing method. Dynamic responses during the machining processhave been measured through the vibration acceleration signals. The ultimate objective of this study is to comprehend the potentiality of CNx coating material forimproving machining process performance by analyzing the frequency response functions and measured vibration signals of the investigated milling process with varying stiffness and damping levels.

  • 2.
    Fu, Qilin
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi. Plasmatrix Materials AB, Sweden.
    Rashid, Md Masud-Ur
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi. Plasmatrix Materials AB, Sweden.
    Nicolescu, Cornel-Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Toth, Geza
    et al.,
    High dynamic stiffness mechanical structures with nanostructured composite coatings deposited by high power impulse magnetron sputtering2016Ingår i: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 98, s. 24-33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nanostructured Cu:CuCNx composite coatings with high static and dynamic stiffness were synthesized by means of plasma-enhanced chemical vapor deposition (PECVD) combined with high power impulse magnetron sputtering (HiPIMS). Scanning electron microscope (SEM) images and energy-dispersive X-ray spectroscopy (EDS) mapping from cross-sectioned samples reveals a multi-layered nanostructure enriched in Cu, C, N, and O in different ratios. Mechanical properties of the coatings were investigated by Vickers micro-indention and model tests. It was observed that copper inclusions as well as copper interlayers in the CNx matrix can increase mechanical damping by up to 160%. Mechanical properties such as hardness, elastic modulus and loss factor were significantly improved by increasing the discharge power of the sputtering process. Moreover the coatings loss modulus was evaluated on the basis of indentation creep measurements under room temperature. The coating with optimum properties exhibited loss modulus of 2.6 GPa. The composite with the highest damping loss modulus were applied on the clamping region of a milling machining tool to verify their effect in suppressing regenerative tool chatter. The high dynamic stiffness coatings were found to effectively improve the critical stability limit of a milling tool by at least 300%, suggesting a significant increase of the dynamic stiffness.

  • 3.
    rashid, Md.Masud-Ur
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Mätteknik och optik.
    Archenti, Andreas
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Manufacturing and Characterization of a Carbon-Based Amorphous (a-CNX) Coating Material2018Ingår i: Nanomanufacturing and Metrology, ISSN 2520-8128, Vol. 1, nr 1, s. 1-14Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A thick 400-micron amorphous carbon nitride (a-CNX ) coating material was synthesized by means of plasma-enhanced chemical vapor deposition process. High-power impulse magnetron sputtering technique was used to sputter a pure graphite target plate in reactive argon (Ar), nitrogen (N2 ) and acetylene (C2 H2 ) environment for depositing the omposite coating. Structural and chemical/elemental composition of the a-CNX  composite material was investigated by field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy and micro-Raman spectroscopy. The rootmean-square surface roughness (Sq ) and structure were estimated by atomic force microscopy. Mechanical properties such as hardness and Young’s modulus (Oliver–Pharr method) at room temperature were characterized by Vickers microindentation test. Operational temperature test of the deposited a-CNX  coating reveals that it can withstand up to 400 C without cracking. An inverted shaker test, based on central impedance method, was adopted to investigate the dynamic damping property of the coating material, and it was found that the first bending mode damping lossfactor of the reported a-CNX  coating is 0.015 ±  0.001 and corresponding loss modulus (Young’s modulus multiplied by lossfactor) is 0.234 ±  0.011 GPa.

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