Cutting force response in milling of Inconel: analysis by wavelet and Hilbert-Huang Transforms

Grzegorz Litak,Rafal Rusinek,Krzysztof Kecik

doi:10.1590/s1679-78252013000100013

Grzegorz Litak, Rafal Rusinek + Show 1 more

Open Access

https://doi.org/10.1590/s1679-78252013000100013

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Abstract

We study the milling process of Inconel. By continuously increasing the cutting depth we follow the system response and appearance of oscillations of larger amplitude. The cutting force amplitude and frequency analysis has been done by means of wavelets and Hilbert-Huang transform. We report that in our system the force oscillations are closely related to the rotational motion of the tool and advocate for a regenerative mechanism of chatter vibrations. To identify vibrations amplitudes occurrence in time scale we apply wavelet and Hilbert-Huang transforms.

Highlights

The modern massive production cannot most often exist without the machining technology
The problems of dynamical instabilities of cutting process and associated harmful chatter vibrations were known for many years
Wavelet analysis provides a spectral-temporal approach to identify the dominant modes of variability in a time series and to delineate how these modes vary over time [8, 9, 13] The continuous wavelet transform (CWT) of the time series Fx(n) with respect to a mother wavelet ψ(t) is given by the convolution of the time series with a scaled and translated version of ψ(t)

Summary

INTRODUCTION

The modern massive production cannot most often exist without the machining technology. The recent development of cutting and milling concepts and techniques gave way to improve the process stability in fairly high speed cutting [1]. Altintas [2] presented vibration and experimental modal analysis of the machine-tool system in a cutting process. Warminski et al [3] considered a model of the metal cutting process in the context of an approximate analysis of the resulting non-linear differential equations of motion. Litak et al / Cutting force response in milling of Inconel: Analysis by wavelet and Hilbert-HuangTransforms free motion of the tool and the corresponding surface location error (SLE) were obtained by solving the differential equations. Inconel was one of the materials due to its high strength over a wide temperature range It forms a thick, stable, passivating oxide layer protecting from corrosion. Inconel is considered as a material of hard machinability [10, 11, 12], and minimizing the number of tool passes is suggested

EXPERIMENTAL PROCEDURE AND MEASUREMENTS

WAVELET AND HILBERT-HUANG ANALYSES

CONCLUSIONS