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Complex taper profile machining of WC-Co composite using wire electric discharge process: analysis of geometrical accuracy, cutting rate, and surface quality

  • Rakhshanda NaveedEmail author
  • Nadeem Ahmad Mufti
  • Kashif Ishfaq
  • Naveed Ahmed
  • Sarmad Ali Khan
ORIGINAL ARTICLE
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Abstract

Complex profiles, comprising curved features and inclined surfaces, are an inherent attribute of tungsten carbide (WC-Co) tooling applications like dies, molds, and cutting tools. Such profiles are difficult to machine by conventional processes due to high hardness of WC-Co. Wire electric discharge machining (WEDM) is a frequently employed non-traditional machining process for producing intricate shapes and complex geometries in difficult-to-cut materials. However, this process offers its own challenges regarding machining accuracy of arced profiles such as undercutting or overcutting of material. Machining task becomes more complicated if arced profiles are to be machined at a certain taper angle. Keeping in view the stringent requirements of productivity and geometrical accuracy for WC-Co tooling, current research is focused on comprehensively evaluating the performance of WEDM process for producing complex tapered profiles in WC-Co composite. Furthermore, instead of using simple brass wire, a zinc-coated wire electrode is employed to enhance cutting rate. The impact of WEDM control variables namely, pulse-on/off time, servo voltage, and wire tension, in conjunction with workpiece taper, is studied on geometrical accuracy, cutting rate, and surface quality of complex tapered profile. Results of experimentation are analyzed using various statistical techniques. Scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) analysis are carried out for in-depth evaluation of machining results. Experimental results show that a complex tapered profile can be generated with as small as 0.16° angular error and 6-μm radial error using optimal parameter settings. Optimal settings of process parameters result into 33.3% reduction in angular error, 14.3% reduction in radial error, 12% increase in cutting speed, and 14.4% reduction in surface roughness of workpiece.

Keywords

Complex tapered profile WC-Co composite WEDM Radial error Angular error EDX analysis 

Notes

Acknowledgements

This research work is a part of PhD thesis titled “Optimization of process parameters for electric discharge machining of tungsten carbide tooling” submitted by Rakhshanda Naveed to University of Engineering and Technology Lahore-Pakistan.

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  • Rakhshanda Naveed
    • 1
    Email author
  • Nadeem Ahmad Mufti
    • 1
  • Kashif Ishfaq
    • 1
  • Naveed Ahmed
    • 1
    • 2
  • Sarmad Ali Khan
    • 1
  1. 1.Department of Industrial and Manufacturing EngineeringUniversity of Engineering and TechnologyLahorePakistan
  2. 2.Raytheon Chair for Systems Engineering, Advanced Manufacturing InstituteKing Saud UniversityRiyadhSaudi Arabia

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