Forthcoming articles


International Journal of Precision Technology


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International Journal of Precision Technology (4 papers in press)


Regular Issues


  • Computer aided tool design for micro-ECM   Order a copy of this article
    by Pratik Shah, S.S. Pande 
    Abstract: This paper reports the development of a computer aided system for micro-ECM process to design tools to produce accurate internal features on workpiece. Mathematical model has been developed to compute the inter-electrode gap (IEG) for chosen shape of tool and process conditions. Axi-symmetric tools of different profiles such as cylindrical, conical, hemispherical have been analyzed to predict the shapes of work cavities. Model is validated with the reported results and some experiments conducted by us on typical tool shapes. Parametric studies have been carried out to study influence of various process variables on the accuracy of cavity shapes. Based on these studies, guidelines for improving profile accuracy in micro-ECM have been suggested.
    Keywords: Micro-ECM; computer aided design system; inter-electrode gap; tool design; process model; parametric studies.

  • Carbon Nanofiber (CNF) Assisted Micro-Electro Discharge Machining (   Order a copy of this article
    by Prasanna Chougule, Rakesh Mote, Uday Dabade 
    Abstract: Titanium alloys have found growing applications in aerospace, biomedical and marine industry. However, extreme hardness and strength cause difficulty in machining of titanium alloys. This is further complicated by the requirements of micro features on hard to machine alloys. Micro Electro discharge machining (micro EDM) is being investigated to match the requirement. However, slower removal rates and thermal effects are the issues in thermal erosion based EDM process. In this work, we have investigated the efficacy of using carbon nanofibers (CNFs) mixed with the dielectric fluid for micro machining of Ti6Al4V using micro EDM. It is observed that the addition of CNFs not only improves electro-discharge frequency, material removal rate but also improves the surface roughness. Added nanofibers lowered the material migration and increased spark gap. We noted a significant influence of mixing CNFs in the dielectric fluid for enhancing machining performance characteristics in
    Keywords: Micromachining; Micro-EDM; Titanium alloys; Carbon nanofibers (CNFs); Additives; Surface integrity.

  • Micro-Faraday cup array structures fabrication in Silicon using Deep Reactive Ion Etching   Order a copy of this article
    by JULFEKAR ARAB, Pradeep Dixit, Prakash Brahmankar, Raju Pawade, Arvind Kumar Srivastava 
    Abstract: Micro-faraday cup array (MFCA) detectors are used for the detection and analysis of incident ion particles. Over the years, MFCA played the vital role in the field ion detection with greater stability and precision. New and simple Micro FCA structures have been designed and fabricated considering the application of ion detection in devices such as Mass spectrometry and laser plasma techniques. MFCA structures were fabricated in n-type Silicon substrate with MEMS fabrication processes such as UV lithography followed by DRIE (Deep reactive ion etching). The UV lithography process was utilized for fabrication of Micro-Faraday cup array structure in photoresist (AZ4903) deposited on silicon substrate. After that DRIE process was used for creating array pattern in Silicon. Ultimately 1x16 arrays having 25
    Keywords: Faraday Cups; micro-fabrication; characterization; UV-LED; DRIE.

  • Femtosecond Laser Assisted Generation of Micro-dimples on Moly-chrome film for Improving its Tribology   Order a copy of this article
    by Ezhilmaran Veeranan, Nilesh J. Vasa, L. Vijayaraghavan, Sivarama Krishnan 
    Abstract: Femtosecond laser ablation of the moly-chrome deposited piston ring and the influence of laser fluence and number of laser pulses on dimple morphology and geometry were analysed. The increase of laser fluence and pulse numbers beyond 8.4 J/cm2 affected the dimple surface by inducing severe cracks due to heat accumulation. Based on the experimental investigation, the ablation threshold for moly-chrome film was found to be 0.36 J/cm2. Textured surface was formed on the moly-chrome film with laser fluence near the ablation threshold and the tribological characteristics were studied. The piston ring surface was textured with dimple diameter of 100 m and dimple aspect ratio of 0.2. Effect of different dimple area ratios, such as 2%, 16% and 38% were analysed by reciprocating type tribology testing. The textured surface with 16% dimple area ratio showed a reduction in friction compared to the plain and the remaining textured piston rings.
    Keywords: surface texturing; micro-dimple; tribology; friction; femtosecond laser.