Experimental Investigations of EDM Parameters on Machining Square Blind Holes in Maraging Steels

Year : 2025 | Volume : 13 | Special Issue 03 | Page : 390-397
    By

    K. Kalyani,

  • P. Prabhakar Reddy,

  • K. Saraswathamma,

  1. Research Scholar, Department of Mechanical Engineering, Osmania University, Hyderabad, Telangana, India
  2. Professor, Department of Mechanical Engineering, Chaitanya Bharthi Institute of Technology, Hyderabad, Telangana, India
  3. Professor, Department of Mechanical Engineering, Osmania University, Hyderabad, Telangana, India

Abstract

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Square blind holes have certain qualities that make them useful in fields where accuracy and efficiency are crucial, like aerospace, automotive, molding, and general manufacturing industries where structural integration is required in precise assembly. It is challenging to machine square blind holes with traditional machining due to geometrical complexity as precision is required for sharp corners which is difficult to get at the corners due to tool wear. Electrical discharge machining is an advanced machining technique used for machining electrically conductive and difficult to cut materials. The primary goal of present work is to evaluate and quantify the output and input parameters during Electric Discharge Machining of square blind holes with varying depths at each level. Here, the experiments were conducted on Maraging steel MDN 250 material which is widely used in aerospace and allied industries because of its unique properties. The material is known for its  good malleability while having exceptional strength and hardness. During experimentation, the depth of the hole was varied while maintaining the input parameters Current, Pulse on Time and duty cycle constant. The output responses that were taken into consideration were the Electrode Wear Rate, machining time, squareness, taperness, and surface roughness. It was noted that the Tool Wear decreased as the hole depth was increased. Squareness values are significant which affects the relative motion between machined parts, which is critical for their functionality. The taperness remains relatively low, suggesting effective control over the machining process. A non-linear relationship where specific depths significantly affect surface finish was noted. The achieved results can be useful in defense, aerospace and EDM industries to increase the productivity with precision.

Keywords: Electrical discharge machining (EDM), electrode wear rate, square blind hole, squareness, taperness, surface roughness.

[This article belongs to Special Issue under section in Journal of Polymer and Composites (jopc)]

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How to cite this article:
K. Kalyani, P. Prabhakar Reddy, K. Saraswathamma. Experimental Investigations of EDM Parameters on Machining Square Blind Holes in Maraging Steels. Journal of Polymer and Composites. 2025; 13(03):390-397.
How to cite this URL:
K. Kalyani, P. Prabhakar Reddy, K. Saraswathamma. Experimental Investigations of EDM Parameters on Machining Square Blind Holes in Maraging Steels. Journal of Polymer and Composites. 2025; 13(03):390-397. Available from: https://journals.stmjournals.com/jopc/article=2025/view=0


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Special Issue Subscription Original Research
Volume 13
Special Issue 03
Received 18/09/2024
Accepted 25/01/2025
Published 29/04/2025
Publication Time 223 Days
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