The present disclosure relates to a grinding method for grinding of non-circular workpieces with an improved productivity and quality of the resulting workpiece. The method comprises a first and a second stage. The rotational speed profile of the workpiece in the first stage is controlled with the purpose of maintaining a pre-selected maximum surface temperature of the workpiece during said first stage, and grinding of the workpiece in said second stage is performed while controlling an aggressiveness number of said second stage so as to achieve an intended final surface quality. The present disclosure also relates to a method for determining the processing parameters of such a grinding method wherein the first and the second stage of the grinding method are iterated to thereby determine the processing parameters leading to a high productivity and desired quality of the workpiece after grinding.
F.32 International patent
COBISS.SI-ID: 13852955The 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: 14188827The 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: 13984027In this chapter we present the results of a quantitative study of priorities and considerations that influence the complex process of choosing to become a STEM (science, technology, engineering or mathematics) PhD student. This study had two main objectives: (1) to identify important factors that influenced student's choice of STEM PhD, and (2) to identify which priorities male and female PhD STEM students in Slovenia seek in their future careers. The chapter describes the influence of different factors such as key persons, age period, influence on social life during student's study process, and different priorities the students seek in their future careers. A key finding is that male and female PhD students in Slovenia are genuinely interested in their chosen PhD study field, but the possibility to get a secure job while working towards the PhD under the Young researchers program (a government initiative to encourage students to enrol on PhD programs), seems to be one of the crucial factors which influenced the final decision to enter a STEM PhD study, for both male and female students.
B.06 Other
COBISS.SI-ID: 1537107908Purpose: Of this paper 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: 14385179