1,721,115 research outputs found
Tool run-out measurement in micro milling
No full textThe interest in micro manufacturing processes is increasing because of the need for
components characterized by small dimensions and micro features. As a result, researchers are
studying the limitations and advantages of these processes. This paper deals with tool run-out
measurement in micro milling. Among the effects of the scale reduction from macro to micro, tool
run-out plays an important role, affecting cutting force, tool life, and the surface integrity of the
produced part. The aim of this research is to develop an easy and reliable method to measure tool
run-out in micro milling. This measuring strategy, from an Industry 4.0 perspective, can be integrated
into an adaptive model for controlling cutting force, with the aim of improving the production
quality and the process stability, while at the same time reducing tool wear and machining costs.
The proposed procedure deduces tool run-out from the actual tool diameter, the channel width,
and the cutting edge’s phase, which is estimated by analyzing the cutting force signal. In order to
automate the cutting edge phase measurement, the suitability of two functions approximating the
force signal was evaluated. The developed procedure was tested on data from experimental tests.
A Ti6Al4V sample was machined using two coated micro end mill flutes made by SECO setting
different run-out values. The results showed that the developed procedure can be used for tool
run-out estimation
Abrasive and diffusive tool wear FEM simulation
No full textIn this paper, an adopted abrasive-diffusive wear model is proposed and implemented into a 3D Finite Element code to study the tool wear phenomenon. In particular, the Authors found that FE procedure based only on diffusive mechanism shown some problems when the extension on crater area was investigated. This can be related to the absence of the wear abrasion term on the utilized model. Therefore, in this work, the Authors improved the previous utilized tool wear model introducing into the sub-routine the abrasive term on the basis of Usui’s model. A series of 3D FEM simulations were conducted in order to estimate the tool wear development in turning operations. The adopted abrasive-diffusive wear model will give the possibility of correctly evaluating the tool wear of actual turning operations during both the initial transient phase, where the abrasive mechanism is dominant, and the steady-state phase, in which the diffusion is the main wear mechanism. The FEM results were compared with experimental data, obtained turning AISI 1045 steel with WIDIA P40 inserts, showing a satisfactory agreement
Lavorazione della Lamiera – Profilatura e Calandratura
No full textCorso di Aggiornamento Professionale (erogazione on-line)
"Deformazione della Lamiera"
Modulo 4 - Calandratura e profilatura a rull
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