Journal
16TH CIRP CONFERENCE ON MODELLING OF MACHINING OPERATIONS (16TH CIRP CMMO)
Volume 58, Issue -, Pages 7-12Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.procir.2017.03.177
Keywords
Numerical model; Empirical model; Residual stresses; Ball end milling; Inconel 718
Categories
Funding
- National Basic Research Program of China [2013CB035802]
- National Natural Science Foundation of China [51575453]
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Machining induced residual stresses can be crucial for the performance and life of the end product. In this paper, a 3D numerical model and an empirical model for residual stresses prediction were built to evaluate the near-surface residual stresses in Inconel 718 under ball end milling conditions. A series of ball end milling experiments of Inconel 718 have been conducted and X-ray diffraction measurements have been utilized to obtain the test residual stress profiles. The comparison results reveal that the numerical model can give an efficient estimation of the residual stress state beneath the machined surface, but the accuracy of the simulation model still needs to be improved. On the basis of the measured residual stresses, an exponentially decaying cosine function was fitted using a particle swarm optimization method. For the purpose of predicting machining induced residual stresses with different cutting parameters, a prediction model based on cutting parameters was developed. A good correlation was observed between the experimental and the predicted results derived from the empirical model. (C) 2017 The Authors. Published by Elsevier B.V.
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