Conference Papers

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Author: search.filters.author.Krishna, P.Subject: search.filters.subject.AISI 4340

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    Machinability studies of low alloy steels by face turning method: An experimental investigation
    (Elsevier Ltd, 2013) Lalbondre, R.; Krishna, P.; Mohan Kumar, G.C.
    The present study is an experimental investigation on machinability of two low alloy steels, AISI 9320 and AISI 4340, by face turning method. The face turning method makes use of cylindrical steel specimen as a test piece and a triangular P-30 insert as a cutting tool for testing the machinability. The effectiveness of this method is assessed by studying: the cutting time required for the tool to reach flank wear up to 0.3mm (tool life criterion); tool wear development and wear mechanisms involved in machining; tool life studies and machinability indices of the work-material; surface roughness investigations of the machined surfaces; and chip morphology. The machinability tests undertaken in the current investigation follows some of the guidelines indicated in the international standards, ISO 3685:1993(E) and American Foundry Society (AFS) standard machinability tests. The results presented here demonstrate the ability of the face turning method: to evaluate the tool wear development and tool life studies; to rank the work material according to their machinability, to investigate surface roughness due to tool wear; to investigate chip morphology with crater wear and to characterize the machinability of steels under consideration. The face turning method used here is simple and effective for the given tool-work material pair. © 2013 The Authors. Published by Elsevier Ltd.
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    Machinability of Hardened Alloy Steel using Cryogenic Machining
    (Elsevier Ltd, 2018) Arun Kumar, S.; Yoganath, V.G.; Krishna, P.
    Machining of hardened alloy steels demand special cutting tools such as PCBN, ceramic. However, these cutting tools are uneconomical and also demand machine tool structures, which have high stiffness and vibration dampening properties. In the current trend towards Green manufacturing it is desired to produce more with less. Green manufacturing also emphasizes on an eco-friendly process. Hence, it is postulated to improve the machinability of these materials by alternate, economical means. One such alternative is cryogenic machining. In the current research work, it is envisaged to study the machinability of hardened alloy steel using commercially available cutting tools (coated carbide) under the influence of cryogenic as the coolant. Machinability factors under influence of cryogenic machining such as tool life, surface roughness and power consumption are studied. Results show that cryogenic as an alternative to coolant during machining of hardened materials increases the process efficiency by reducing energy consumption and also showed significant improvement in tool life. The process thus demonstrates the capability of replacing the special cutting tools that are required for hard turning applications. The portability of the setup for commercial use is also considered. © 2017 Elsevier Ltd.