بحث بعنوان Study on Grindability of Inconel 718 By cBN Wheels

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Study on Grindability of Inconel 718 By cBN Wheels
D. V. Patil*, A. K. Chattopadhyay** and A. B. Chattopadhyay**.
* Professor, Dept of Mech. Engg., SDMCET. Dharwad, Karnataka.
** Professor, Dept of Mech. Engg. IIT Kharagpur, West Bengal
(* Corresponding author. Phone no : 0836 2447465 Fax no: Mobile no: 9481209729
Email-id dvpatil61@yahoo.com )

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Abstract
Inconel 718 is, like Nimonic, a Nickel, iron and chromium base super alloy, that possesses several useful properties like, high strength and
hot strength and resistance to fatigue and corrosion. Inconel 718 has found wide applications in automobile, aerospace, nuclear industries
and few critical components of machines, especially for those components that are subjected to high temperature stresses and dynamic
loading. Owing to its high strength and poor thermal conductivity machining and grinding of this alloy substantially difficult. Work
hardening of the machined surfaces aggravates the problem still further and this alloy requires larger grinding force and specific energy
which again, keep on increasing with progress of machining and grinding. The present paper deals with experimental study of grindability
of Inconel 718 under different conditions in terms of chip formation, grinding forces and specific energy requirement. It has been observed
that, unlike steel, Inconel 718 showed gradual rise in grinding forces and specific energy and was found to be mainly for its work
hardening with progress of grinding. However, Inconel 718 provided quite favorable chip formation mainly by shearing without visible
wheel loading, and the grindability of Inconel 718 has been found to improve under high efficiency deep grinding (HEDG) seemingly due
to high grinding velocity, larger in feed, use of monolayer cBN wheel and profusely cooling by two high speed jets of soluble oil. The
experimental details and the results have been reported in this paper.
Key words: Monolayer cBN wheel, Inconel 718
Conclusions
The following observations are made from different calculations of this study:
The maximum principal 2D stress induced in the reference model is 82.2 Hbar. The maximum vonMises stress induced in the same model is 76.11 Hbar.
WP2 gives more accurate result compared to that of the WP1.The stress induced in the structural zoom
model without damage is more than that at the corresponding area of the reference model.
It is obvious that the stresses for the WP3 i.e. structural zoom model considering the damage are higher
than that of the WP2 due to damage in the model.
Maximum Principal 2D and von-Mises stresses of zoom model with damage are 33.7 Hbar and 34.5
Hbar respectively. The same stresses at the corresponding areas of zoom model without damage are
18.7 Hbar and 18.0 Hbar respectively. From these it can be concluded that the stress concentration
factor is in between 1.8 to 1.9.

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