China
Africa
Explore chapters and articles related to this topic
Post-Process Surface Metrology
Published in Richard Leach, Simone Carmignato, Precision Metal Additive Manufacturing, 2020
Nicola Senin, Francois Blateyron
There are a number of optical methods for surface topography measurement, and they will not be covered in detail here. Leach (2011) presents detailed background on all the techniques which have been recently standardised: phase-shifting interferometric microscopy (ISO 25178-603 2013, de Groot 2011a), coherence scanning interferometry (ISO 25178-604 2013, de Groot 2011b), confocal microscopy (ISO 25178-607 2019, Artigas 2011), confocal chromatic probe instruments (ISO 25178-602 2010, Blateyron 2011), focus variation instruments (ISO 25178-606 2015, Helmli 2011) and point autofocus probe instruments (ISO 25178-605 2014, Miura and Nose 2011). Though most instruments typically belong to one of the above classes, a few commercial offerings have begun to appear embedding multiple optical modes within the same instrument body so that they can switch across methods and select the most suitable one for each specific test case. In the following sections, the discussion will focus on the use of such methods on AM surfaces and on the advantages and limitations of each method in the specific context of AM related applications.
Tool texturing for micro-turning applications – an approach using mechanical micro indentation
Published in Materials and Manufacturing Processes, 2021
Jiju V. Elias, Prasanna Venkatesh N., Deepak Lawrence K., Jose Mathew
The current experimental study analyzes the effectiveness of the mechanical micro indentation based texturing by analyzing the machining forces, surface roughness, machining interface temperature, and flank wear advance in micro-turning of Grade 5 Titanium alloy with the application of MQL. A 3-axis hybrid micromachining center (Model: DT110, Make: Mikrotools) was used for conducting micro-turning experiments. Compressed air at 5 bar pressure mixed with biodegradable vegetable oil-based lubricant (TAURLUBE-VEGOIL 33) having a kinematic viscosity of 32.5 cSt and density of 1036 kg/m3 was sprayed to the cutting zone by means of an MQL setup with pneumatic control (Model: MiQuel Basei 3l, Make: Dropsa). The flow rate of oil was set at 10 ml/hr, which yielded the best results during preliminary studies. Mini-Dyn multicomponent dynamometer (Kistler 9256C2) was used for measuring the cutting forces during machining. Infrared thermography based thermal imager (Model: T420, Make: FLIR) was used for measuring the chip temperature. The infrared camera was focused on the tool nose region, where the chip curls out, at 0.5 m distance from the cutting tool, with the thermal emissivity set at 0.55. Focus-variation based 3-D optical profilometer (Alicona InfiniteFocus G5) was used for determining the surface roughness and the tool wear studies.
Impact of machining process on the flexural strength of CAD/CAM blocks for dental restorations
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2020
Aurélie Benoit, Hiba Issaoui, Nicolas Lebon
For Coltene Brilliant Crios composite, two additional conditions were investigated: high polishing (HP) (1 µm) and flank milling with Cerec milling bur (FC). Surface roughness was estimated using Alicona focus variation microscope.