Study on Effectiveness of HSS and HSS-Cobalt Twisted Drills on Surface Roughness

Ch Maheswara Rao; R. Vara Prasad; Kvenkata Subbaiah

doi:https://doi.org/10.51976/ijari.912110

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Study on Effectiveness of HSS and HSS-Cobalt Twisted Drills on Surface Roughness

Ch Maheswara Rao, R. Vara Prasad, Kvenkata Subbaiah

Vol 9 , Issue 1 , January - March 2021 | Pages: 62-66 | Research Paper

https://doi.org/10.51976/ijari.912110

Received: December 20, 2020 | Revised: February 28, 2021 | Accepted: March 05, 2021 | Published Online: March 15, 2021

Author Details ( * ) denotes Corresponding author

1. * Ch Maheswara Rao, Department of Mechanical Engineering, ANITS, Visakhapatnam, Andhra Pradesh, India (maheswararao.me@anits.edu.in)

2. R. Vara Prasad, Department of Mechanical Engineering, ANITS, Visakhapatnam, Andhra Pradesh, India

3. Kvenkata Subbaiah, Department of Mechanical Engineering, ANITS, Visakhapatnam, Andhra Pradesh, India

This paper focuses on the optimization of drilling parameters by using Taguchi method for achieving maximum Material Removal Rate (MRR) and minimum Surface Roughness (Ra). The experiments were carried out on material EN8, medium carbon steel using HSS and HSS-Cobalt drills. Four cutting parameters such as Drill Type (HSS, HSS-Cobalt), Point Angle (90º, 118º, 135º), feed rate (90, 240, 450 mm/min), speed (900, 1200, 1500 RPM) were considered as the control factors. The signal-to-Noise (S/N) Ratios and the analysis of variance (ANOVA) have been employed to determine the effectiveness of parameters on the responses. The results revealed that feed rate was the most significant factor for material removal rate and Drill–type was for surface roughness. The models predicted for the responses were found to be best fit and accurate for the future predictions.

Keywords

EN 8 Steel; Material Removal Rate (MRR); Surface Roughness (Ra); Taguchi Method; Analysis of Variance (ANOVA).

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