Assoc.prof.dr. Franci Pušavec has, as a visiting researcher at University of Kentucky (Institute for Sustainable Manufacturing), given a lecture on the actual research status of cryogenic machining.
B.05 Guest lecturer at an institute/university
COBISS.SI-ID: 13561371The invention relates to the use of an optical phase detection sensor arrangement (1) for detecting the phase of a cryogenic fluid (2) in a conduit of a cryogenic fluid delivery system, said phase detection sensor arrangement comprising: an inlet port (3) for receiving cryogenic fluid; an outlet port (4) for releasing cryogenic fluid; a first connecting portion (5) for connection to a light source (6); a second connecting portion (7) for connection to a light sink (8); a housing (9); and a measurement chamber (10) provided in said housing between, and preferably in fluid communication with, said inlet port and said outlet port; wherein said first and second connecting portions are arranged in said housing so that said light source and said light sink, when connected to said first and second connecting portions, are arranged such that light can be emitted from said light source into said measurement chamber, and said emitted light can be received by said light sink.
F.32 International patent
COBISS.SI-ID: 13984027The invention relates to a lubrication and cooling device (1), comprising; a cooling fluid device (3), which comprises a first channel (5), which is connected to a first inlet port (7), and a lubricant fluid device (9), which comprises a second channel (11), which is connected to a second inlet port (13). 5 The lubrication and cooling device (1) further comprises a heat exchanger (15), which comprises a cooling circuit (17) and a lubricant delivery circuit (19). The heat exchanger (15) is arranged to cool the lubricant fluid (24) by means of the cooling fluid (22).
F.32 International patent
COBISS.SI-ID: 14188827Purpose of the work is to present state-of-the-art on cryogenic machining and delivery principles of liquid nitrogen to the machining/cutting zone. Additionally, the influence of cooling/lubrication conditions on the surface integrity, generated during turning of Inconel 718, are analysed and presented. Design/methodology/approach: Of the paper are to present the design of the cryogenic machining system and how the liquefied nitrogen is delivered to the cutting zone. Additionally, the system is used to evaluate the effect on surface integrity of machined Inconel 718 workpiece. Methodologies used for the surface integrity evaluation are: electro-polishing, X-ray diffraction and micro indentation hardness measurements, with the approach to evaluate the extent of cryogenic influence on machined surface. Findings: The results show that the cryogenic machining process generates larger compressive residual stresses, and prevail at deeper levels beneath the machined surface, thus resulting in improved product quality and performance characteristics in terms of fatigue life and wear resistance. Research limitations/implications: The solutions of the delivery and the evaluation results have been all performed for the turning process, while there is still a challenge for the implementation of findings on the milling and drilling process kinematics. Practical implications: Work shows that cryogenic machining is capable of improving surface integrity and with this, as practical implication, having high potential for improving the sliding conditions, fatigue life of the final product, corrosion resistance, etc. Originality/value: Originality of the paper is shown by novel solutions (patents) on cryogenic machining system (delivery) and in machined surface modification capabilities with alternative cooling/lubrication fluid.
B.04 Guest lecture
COBISS.SI-ID: 14385179Technical University of Wien has organized the industrial congress WPK in years 2014 and 2016 (Industrie 4.0: die intelligente Fabrik der Zukunft, http://www.produktionstechnik.at). On both congresses Franci Pušavec, as invited guest, presented state-of-the-art on cryogenic machining.
B.04 Guest lecture
COBISS.SI-ID: 13458715